CN105756826B - Combined electromagnetic oil spout is pressurized electromagnetism jet hybrid fuel jet device - Google Patents

Abstract

The object of the present invention is to provide a combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device, which includes a gas booster part, a double solenoid valve part, a control part, a double needle valve nozzle part and an injection device housing. The invention adopts double-needle valve nozzles to inject two fuels, fuel oil and gas, respectively, which saves space and simplifies the engine structure. The working state and working sequence of the solenoid valve, the injection device can realize multiple working modes such as only injecting fuel or gas, injecting two fuels at the same time, injecting two fuels sequentially, etc. The present invention adopts the supercharging piston to pressurize the gas, the gas supercharging control is separated from the gas injection control, and the gas injection process can be switched between the supercharging mode and the non-supercharging mode arbitrarily, so as to obtain "shoe-shaped" and "slow first and then urgent" gas injection law.

Description

Combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device

technical field

The invention relates to a fuel injection device, in particular to a dual-fuel engine fuel injection device.

Background technique

With the continuous consumption of fossil fuels and the increasingly stringent emission regulations of internal combustion engines, the use of alternative fuels is an effective means to simultaneously solve the problems of energy shortage and environmental pollution faced by engine development. Natural gas and petroleum gas have become the main substitute fuels for internal combustion engines due to their abundant resources, low price, clean combustion, and high calorific value.

At present, there are two main fuel supply methods for dual-fuel engines: one is to mix the gaseous fuel with the inhaled air before it is introduced into the engine cylinder, and then directly inject a certain amount of liquid fuel near the top dead center of the combustion chamber, thereby causing Burning gas fuel, this method is likely to cause engine knocking, and in addition, when the engine is under low load, the pre-mixed gas is too thin to be conducive to combustion. Another method is to inject the gas directly into the combustion chamber, and also use the pilot amount of liquid fuel to trigger the combustion of the gas fuel. This method will not cause the engine to deflagrate prematurely, and the fuel burns in the diffusion combustion mode, and the combustion effect is good. , but it also has certain problems: First, the structure of the modern engine cylinder head is complex and there are many parts, so it is difficult to arrange two injectors. In addition, if two injectors are installed to inject dual fuel, the original The diesel engine has undergone major changes, increasing the complexity of device processing and assembly. Second, in order to improve the mixing degree of oil and gas, a supercharging device is usually used to pressurize the gas to increase the gas injection pressure. Compared with liquid fuel, if the gas is boosted by a high-pressure pump, the transmission process from the pump end to the injection device will Pipeline structure, tightness and strength requirements are high. Third, the injection device has high requirements for gas sealing. With the movement of the needle valve, the gas leaks upward along the gap between the needle valve coupler, and the leaked gas enters the control chamber, resulting in a decrease in the gas injection pressure and injection rate, which seriously affects the working stability of the device.

Contents of the invention

The object of the present invention is to provide a combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device which can switch between supercharged and non-supercharged modes during the injection process, accurately controllable fuel injection quantity, and flexible and variable injection law.

The purpose of the present invention is achieved like this:

The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention is characterized in that it includes a gas booster part, a gas injection part, a fuel injection part, an injection device body, an electromagnetic valve sleeve, a needle valve base, and a gas booster The part is installed above the injection device body, the solenoid valve sleeve is installed in the injection device body, the needle valve base is installed under the injection device body through the nozzle sleeve, and the needle valve base includes a gas base and a fuel base;

The gas booster part includes a booster solenoid valve, a booster piston, a booster piston sleeve, and an intake valve, and the booster solenoid valve includes a booster solenoid valve seat, a booster electromagnet, a booster armature, and a booster solenoid valve stem. The booster solenoid valve seat is provided with a servo oil inlet port and a servo oil drain port. One end of the booster solenoid valve rod is fixed on the booster armature through a booster stop ring, and the other end passes through the booster solenoid valve seat and is in the sleeve. The pre-tightening force of the booster solenoid valve spring on it presses down on the baffle plate, the position of the booster armature forms a booster armature cavity, and the position of the booster solenoid valve spring forms a booster solenoid valve spring cavity, and the booster solenoid valve spring cavity is formed. The solenoid valve rod is provided with an annular oil belt, which realizes the connection or disconnection between the servo oil inlet port and the booster armature cavity and the connection between the servo oil drain port and the booster solenoid valve spring chamber through the movement of the booster solenoid valve rod. connected or disconnected; the booster piston is installed in the booster piston sleeve, and the booster piston sleeve is installed under the booster solenoid valve seat, and the servo oil is formed between the upper end of the booster piston, the booster piston sleeve and the booster solenoid valve seat. A booster chamber is formed between the lower end of the booster piston and the booster piston sleeve, and the booster piston spring is set on the booster piston; the intake valve is a one-way valve, installed in the booster piston sleeve, and the booster piston sleeve A gas inlet is arranged on the top, the gas inlet is connected to the intake valve, and the outlet of the intake valve is connected to the booster chamber;

The gas injection part includes a control gas solenoid valve installed in the solenoid valve sleeve, a gas needle valve limit rod and a gas needle valve installed in the gas base. The control gas solenoid valve includes a gas solenoid valve body, a gas solenoid , gas armature, gas valve stem upper seal base, gas valve stem lower seal base, gas solenoid valve spring, gas solenoid valve stem, gas solenoid valve body, gas valve stem upper seal seat, gas valve stem lower seal seat and gas needle The valve limit rod is arranged from top to bottom, the gas solenoid valve cavity is formed between the gas solenoid valve body and the upper sealing base of the gas valve stem, and the gas groove cavity is formed between the upper sealing base of the gas valve stem and the lower sealing base of the gas valve stem. The gas solenoid is installed in the chamber of the gas solenoid valve, the gas armature is located below the gas solenoid, one end of the gas solenoid valve stem is stuck on the gas armature through the gas stop ring, and the other end runs through the gas valve stem under the gas armature to seal the base , and cooperate with the lower sealing base of the gas valve stem, the gas oil drain cavity is formed between the lower end of the gas solenoid valve stem and the lower sealing base of the gas valve stem, and the gas solenoid valve stem is respectively provided with the upper sealing base of the gas valve stem The matching gas upper sealing cone surface and the gas lower sealing cone surface matched with the gas valve stem lower sealing base, the part of the gas solenoid valve stem and the gas valve stem upper sealing base that cooperates forms a gas low-pressure oil ring belt, and the gas solenoid valve valve The part where the rod matches the lower sealing base of the gas valve stem forms a gas high-pressure oil ring belt, the first gas oil channel and the fourth gas oil channel are set on the upper sealing base of the gas valve stem, and the second gas oil channel is set on the lower sealing base of the gas valve stem. The oil channel and the third oil channel for gas, the fifth oil channel for gas is set in the solenoid valve sleeve, the high-pressure oil inlet, the first low-pressure oil drain port and the second low-pressure oil drain port are set on the injection device body, the first oil channel for gas is connected to the gas The solenoid valve cavity and the first low-pressure oil drain port, the second gas oil channel is connected to the gas high-pressure oil ring belt and the high-pressure oil inlet, the central oil channel is set in the gas needle valve limit rod, and the third gas oil channel is connected to the gas groove cavity and The central oil channel, the fourth gas oil channel is connected to the gas low-pressure oil ring belt and the gas solenoid valve cavity, the gas oil drain cavity is connected to the second low-pressure oil drain port, the gas needle valve is located under the gas needle valve limit rod, the gas needle valve is connected to the gas valve A sealing ring and a gas chamber are respectively formed between the bases, the sealing ring is connected to the high-pressure oil inlet through the fifth gas oil channel, the gas chamber is connected to the pressurization chamber through the gas channel in the solenoid valve sleeve, and gas injection holes are arranged at the end of the gas base;

The fuel injection part includes a control fuel solenoid valve installed in a solenoid valve sleeve, a fuel piston and a fuel needle valve installed in a fuel base. The control fuel solenoid valve includes a fuel solenoid valve body, a fuel solenoid, a fuel armature, Fuel valve stem upper seal base, fuel valve stem lower seal base, fuel solenoid valve spring, fuel solenoid valve stem, fuel valve stem upper seal base, fuel valve stem lower seal base and fuel piston are arranged from top to bottom, fuel solenoid valve A fuel solenoid valve cavity is formed between the body and the upper sealing base of the fuel valve stem, and a fuel groove cavity is formed between the upper sealing base of the fuel valve stem and the lower sealing base of the fuel valve stem. The fuel solenoid is installed in the fuel solenoid valve cavity, and the fuel armature Located below the fuel solenoid, one end of the valve stem of the fuel solenoid valve is stuck on the fuel armature through the fuel stop ring, and the other end passes through the upper sealing base of the fuel valve stem under the fuel armature. The base matches the fuel lower sealing taper, the fuel solenoid valve stem matches the fuel valve stem lower sealing base to form a fuel high-pressure oil ring belt, and the fuel valve stem upper sealing base is set to communicate with the fuel solenoid valve cavity and the fuel groove. cavity of the fuel valve stem upper sealing base channel, the fuel solenoid valve cavity is connected to the first low-pressure oil drain port, the fuel drain cavity is formed between the lower end of the fuel solenoid valve stem and the lower sealing base of the fuel valve stem, and the fuel drain cavity is connected to the second Two low-pressure oil drain ports, the upper end of the fuel piston is covered with a fuel piston sleeve, the fuel piston sleeve is located between the lower sealing base of the fuel valve stem and the fuel piston, and the fuel piston control chamber is formed between the fuel piston and the fuel piston sleeve above it, and the fuel piston The control chamber communicates with the fuel high-pressure oil ring belt through the fuel oil channel. The fuel piston is covered with a fuel piston spring. The fuel needle valve is located under the fuel piston. An oil tank is formed between the fuel needle valve and the fuel base, and the oil tank is connected to the high-pressure fuel inlet. .

The present invention may also include:

1. The upper end of the gas needle valve is designed with a circular step. The gas needle valve control chamber is formed between the bottom of the circular step and the injection device body. The lower end of the gas needle valve limit rod is set inside the circular step of the gas needle valve. The gas needle valve control chamber communicates with the central oil passage.

2. When the control gas solenoid valve is not energized, the valve stem of the gas solenoid valve is pressed on the sealing base under the gas valve stem under the action of the gas solenoid valve spring, the gas high-pressure oil ring is closed, the gas low-pressure oil ring is opened, and the gas needle valve The control chamber is connected to the first low-pressure oil drain port; when the control gas solenoid valve is energized, the valve stem of the gas solenoid valve lifts up and presses on the sealing base of the gas valve stem, the gas low-pressure oil ring is closed, the gas high-pressure oil ring is opened, and the gas The needle valve control chamber communicates with the high-pressure oil inlet.

3. When the control fuel solenoid valve is not energized, the fuel solenoid valve stem is pressed on the lower sealing base of the fuel valve stem under the action of the fuel solenoid valve spring, and the fuel oil channel is disconnected from the fuel groove cavity. When the control fuel solenoid valve is energized , the stem of the fuel solenoid valve lifts up, and the fuel oil channel communicates with the fuel groove cavity.

The advantage of the present invention is that: the combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention uses a double needle valve nozzle to inject two kinds of fuel, which saves space and simplifies the engine structure. During the gas injection process, when one solenoid valve works alone, the injection device only injects one fuel; when two solenoid valves work at the same time, two fuels are injected at the same time; Sequential fuel injection, the injection device can work in pure diesel mode and fuel pilot gas mode, to meet the requirements of the engine for oil and gas mixing under different working conditions. In addition, the device adopts the supercharging piston to supercharge the gas, and the supercharging control is separated from the gas injection control, which not only can realize the arbitrary switching between supercharging and non-supercharging modes during the gas injection process, but also can control the start of supercharging regardless of the injection starting point. Time, so as to obtain the "boot shape", "first slow and then urgent" jet law.

At the same time, the device has the following beneficial effects: the device controls the oil drain circuit to flow through the upper part of the solenoid valve body, and the heat is taken away through the oil drain cycle to reduce the temperature of the solenoid valve part, ensuring the reliability and stability of the solenoid valve. A long sealing belt and a large oil chamber are used between the booster piston and the booster piston sleeve to prevent gas leakage and improve the stability of the gas injection device; a sealing ring is designed between the gas needle valve and the needle valve seat, and the introduction part The control oil is used as the sealing oil to seal the gas, which can effectively prevent gas leakage. At the same time, the control oil in the control chamber and the sealing oil in the sealing ring adopt the same oil, and the oil pressure is equal, which can effectively ensure that the control oil and sealing oil have no static leakage .

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2a is a schematic diagram of the gas boosting part, Fig. 2b is a schematic diagram of a booster solenoid valve, Fig. 2c is a schematic diagram of an intake valve, Fig. 2d is a schematic diagram of a solenoid valve stem position 1, and Fig. 2e is a schematic diagram of a solenoid valve stem position 2;

Fig. 3a is a partial schematic diagram of the double solenoid valve of the present invention, Fig. 3b is a schematic diagram of controlling the gas solenoid valve, Fig. 3c is a schematic diagram of controlling the fuel solenoid valve, Fig. 3d is a schematic diagram of the valve stem position 1 of the gas solenoid valve, and Fig. 3e is a schematic diagram of the gas solenoid valve stem Schematic diagram of position 2;

Fig. 4a is a schematic diagram of the control part, and Fig. 4b is a view of A-A;

Fig. 5a is a schematic diagram of a part of the nozzle, Fig. 5b is a schematic diagram of a part of a gas nozzle, and Fig. 5c is a schematic diagram of a part of a fuel nozzle.

detailed description

The present invention is described in more detail below in conjunction with accompanying drawing example:

1 to 5, the combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention is mainly composed of a gas booster part 1, a double solenoid valve part 2, a control part 4, a double needle valve nozzle part 5 and an injection device Body 6 composition. The injector body 6 is designed with a first low-pressure oil drain port 3, a high-pressure fuel inlet 6, a second low-pressure oil drain port 8, and the like. The gas booster part 1 mainly includes a booster solenoid valve 9, a booster piston 10, a booster piston spring 11, a booster piston sleeve 12, an intake valve 14, a booster chamber 15, a servo oil chamber 17, and the like. The double solenoid valve part 2 mainly includes a control gas solenoid valve 34, a control fuel solenoid valve 35, a solenoid valve sleeve 36, etc., and the control gas solenoid valve 34 and the control fuel solenoid valve 35 are all installed in the solenoid valve sleeve 36. The control part 4 mainly includes gas needle valve limit rod 59, injection device inner cylinder 62, gas needle valve control chamber 63, fuel piston spring seat 64, fuel piston spring 65, fuel piston 66, fuel piston sleeve 68, fuel piston control chamber 70. Each component is installed in the inner cylinder 62 of the injection device, and the inner cylinder 62 of the injection device is designed with an annular oil groove 69, an oil passage 67, an oil passage 61 and a central air passage. The high-pressure control oil flowing in from the high-pressure fuel inlet 6 flows through the annular oil groove 69 and is divided into two paths, one path flows into the oil passage 61, and then flows into the gas needle valve control cavity 63 and the high-pressure oil ring belt 48 that controls the gas solenoid valve 34; The oil passage 67 flows into the fuel piston control cavity 70 and the oil storage tank 84 again. The double needle valve nozzle part 5 mainly includes a gas nozzle 71, a fuel nozzle 72, a needle valve base 73, a sealing ring 74, a nozzle cover 75, etc., and the gas nozzle 71 and the fuel nozzle 72 share a needle valve base 73. The gas nozzle 71 is made up of a gas needle valve spring 76, a gas needle valve 77, a gas chamber 79, a gas injection hole 80, and a sealing ring 82. An annular step is designed on the upper end of the gas needle valve 77, and a gas needle valve control chamber 63 is formed between the gas needle valve 77 and the injector body 6 under the annular step. The gas needle valve 77 and the gas needle valve limit rod 59 are installed coaxially, and the control oil enters the gas needle valve control cavity 63 through the central oil passage 60 on the gas needle valve limit rod 59 . A sealing ring 82 is designed between the gas needle valve 77 and the needle valve base 73 , and part of the control oil is introduced into the sealing ring 82 through the oil passage 78 on the needle valve base 73 .

Booster solenoid valve 9 is composed of solenoid valve seat 19, solenoid valve spring 20, solenoid valve stem 22, spring washer 23, baffle plate 24, armature 25, solenoid valve body 26, stop ring 27, coil 28, electromagnet 29, etc. . Wherein the solenoid valve rod 22 is designed with an annular oil belt 21 , and the solenoid valve seat 19 is designed with a servo oil inlet 30 , a servo oil drain 18 and a gas inlet 13 . When the solenoid valve 9 is not energized, the annular oil belt 21 communicates with the oil drain port 18 and the servo oil chamber 17 through the oil passage; The intake valve 14 is a one-way valve, installed on the booster piston sleeve 12, mainly including the intake valve seat 31, the intake valve spring 32, the intake valve stem 33, etc.

Control gas solenoid valve 34 mainly includes solenoid valve body 37, electromagnet 38, coil 39, armature 40, valve stem upper sealing base 42, solenoid valve spring 43, solenoid valve stem 44, valve stem lower sealing base 45, stop ring 53 etc. The solenoid valve stem 44 is designed with two sealing cones, and is designed with a high-pressure oil ring 48 and a low-pressure oil ring 50. When the gas solenoid valve 34 is not powered, the solenoid valve stem 44 acts on the solenoid valve spring 43. Press down on the lower sealing base 45 of the valve stem, the high-pressure oil ring 48 is closed, and the low-pressure oil ring 50 is opened; when the control gas solenoid valve 34 is energized, the solenoid valve stem 44 is lifted and pressed on the upper sealing base 42 of the valve stem, The low-pressure oil ring belt 50 is closed, and the high-pressure oil ring belt 48 is opened.

The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention is mainly composed of a gas booster part 1, a double solenoid valve part 2, a control part 4, a double needle valve nozzle part 5 and an injection device body 6. The injector body 6 has a first low-pressure oil drain port 3 , a high-pressure fuel oil inlet 6 and a second low-pressure oil drain port 8 , and a gas inlet 13 is designed on the gas booster part 1 .

The gas pressurized part 1 is located above the injector body 6, and the two are connected by threads. The gas booster part 1 mainly includes a booster solenoid valve 9, a booster piston 10, a booster piston spring 11, a booster piston sleeve 12, an intake valve 14, a booster chamber 15, a servo oil chamber 17, and the like. Wherein, booster solenoid valve 9 is made of solenoid valve seat 19, solenoid valve spring 20, solenoid valve stem 22, spring washer 23, baffle plate 24, armature 25, solenoid valve body 26, stop ring 27, coil 28, electromagnet 29 and so on. The intake valve 14 is a one-way valve, installed on the booster piston sleeve 12, and mainly includes an intake valve seat 31, an intake valve spring 32, an intake valve stem 33, and the like. The solenoid valve stem 22 of the booster solenoid valve 9 is designed with an annular oil belt 21 , and the solenoid valve seat 19 is designed with a servo oil inlet 30 , a servo oil drain 18 and a gas inlet 13 . One end of the solenoid valve stem 22 is fixed on the solenoid valve armature 25 through the stop ring 27, and can move left and right together with the armature 25. 24 on. The electromagnetic valve seat 19 can limit the lift of the electromagnetic valve rod 22, and an oil passage is designed on it, which can guide part of the servo oil to flow through the electromagnetic valve 9, cool the electromagnetic valve 9 and reduce the armature of the electromagnetic valve. 25 and the effect of the shock and vibration of valve rod 22 left and right motions. A servo oil cavity 17 is formed between the pressure surface above the large head of the booster piston 10 and the piston sleeve 12 and the solenoid valve seat 19, and a booster chamber 15 is formed between the pressure surface below the small head of the booster piston 10 and the piston sleeve 12. The return spring 32 of the intake valve 14 has a small pretightening force and low opening pressure. When the gas enters the intake valve 14, the valve stem 33 is opened under the action of the gas, and the gas enters the booster chamber 15; When the gas pressure in the pressure chamber 15 rises, the intake valve 14 is closed. The booster piston 10 and the booster piston sleeve 12 are a pair of precision couples with a small matching gap and a large contact length, which can effectively prevent the gas in the booster chamber 15 from going up and prevent the fuel oil in the servo oil chamber 17 from leaking; A large cavity 16 is formed between the big head of the pressure piston 10 and the groove of the piston sleeve 12. Even if some gas and fuel oil leak into the cavity 16, the mixing of oil and gas in the cavity can hinder its further mutual penetration. The oil film formed on the surface is in a dynamic equilibrium state during the piston movement, which can further prevent gas leakage.

The double solenoid valve part 2 is located in the injection device body 6 below the gas booster part 1, mainly including the control gas solenoid valve 34, the control fuel solenoid valve 35, the solenoid valve sleeve 36, etc., the control gas solenoid valve 34 and the control fuel solenoid valve 35 They are all positioned and installed in the electromagnetic valve sleeve 36. Control gas solenoid valve 34 mainly includes solenoid valve body 37, electromagnet 38, coil 39, armature 40, valve stem upper sealing base 42, solenoid valve spring 43, solenoid valve stem 44, valve stem lower sealing base 45, stop ring 53 etc. A solenoid valve cavity 52 is formed between the solenoid valve body 37 and the upper sealing base 42 of the valve stem, and a groove cavity 49 is formed between the upper sealing base 42 of the valve stem and the lower sealing base 45 of the valve stem. The electromagnet 38 is installed in the solenoid valve cavity 52 of the solenoid valve body 37, the armature 40 is located below the electromagnet 38, one end of the solenoid valve stem 44 is stuck on the armature 40 through the stop ring 53, and the other end runs through the valve below the armature 40. The upper sealing base 42 of the stem is pressed on the lower sealing base 45 of the valve stem. The solenoid valve stem 44 is designed with two sealing cones, and is designed with a high-pressure oil ring 48 and a low-pressure oil ring 50. When the gas solenoid valve 34 is not powered, the solenoid valve stem 44 acts on the solenoid valve spring 43. Press down on the lower sealing base 45 of the valve stem, the high-pressure oil ring 48 is closed, and the low-pressure oil ring 50 is opened, as shown in Figure 3(d), at this time the gas needle valve control chamber 63 and the first low-pressure oil drain port 3 Connected; when the gas solenoid valve 34 is energized, the solenoid valve stem 44 lifts and presses on the sealing base 42 on the valve stem, the low-pressure oil ring belt 50 is closed, and the high-pressure oil ring belt 48 is opened, as shown in Figure 3(e), At this time, the gas needle valve control cavity 63 communicates with the high-pressure oil inlet 7 . An oil passage 41 and an oil passage 51 are designed on the sealing base 42 on the valve stem. The oil passage 51 communicates with the low-pressure oil ring belt 50 and the solenoid valve chamber 52 . The oil passage 41 communicates with the solenoid valve chamber 52 and the first low-pressure oil drain port 3 . An oil passage 46 and an oil passage 47 are designed on the sealing base 45 under the valve stem. The oil passage 46 communicates with the high-pressure oil ring belt 48 and the high-pressure oil inlet 7, and the oil passage 47 communicates with the center oil of the groove cavity 49 and the gas needle valve limit rod 59. Road 60. The drain oil circuit of the device flows through the solenoid valve, and the heat of the double solenoid valve is taken away by the fuel flow, which plays the role of cooling the solenoid valve, and reduces the impact and vibration of the armature of the solenoid valve moving up and down, thereby improving the work of the double solenoid valve. stability. The control valve stem of the control fuel solenoid valve 35 has only one sealing cone and a high-pressure oil ring belt 57. . The control part 4 is located in the injection device body 6 below the double solenoid valve part 2, and mainly includes the inner cylinder 62 of the injection device, the gas needle valve control chamber 63, the fuel piston spring seat 64, the fuel piston spring 65, the fuel piston 66, and the fuel piston sleeve 68. Fuel piston control chamber 70. The components of the control part 4 are installed in the inner cylinder 62 of the injection device. The inner cylinder 62 of the injection device is designed with an annular oil groove 69, an oil passage 67, an oil passage 61 and a central air passage. The top view of the annular oil groove 69 is shown in Figure 4 (b). Show. The high-pressure control oil flowing in from the high-pressure fuel inlet 6 flows through the annular oil groove 69 and is divided into two paths, one path flows into the oil passage 61, and then flows into the gas needle valve control cavity 63 and the high-pressure oil sealing ring 48 controlling the gas solenoid valve 34; the other path It flows into the oil passage 67, and then flows into the fuel piston control chamber 70 and the oil sump 84. The double-needle valve nozzle part 5 is located below the injection device body 6, and mainly includes a gas nozzle 71, a fuel nozzle 72, a needle valve base 73, a sealing ring 74, a nozzle cover 75, etc., and the gas nozzle 71 and the fuel nozzle 72 share a needle valve base 73 . There are gas inlet passages and air inlet grooves in the middle of the needle valve base 73, and oil inlet grooves and oil inlet passages are all arranged on both sides. The middle air passage introduces high-pressure gas into the gas chamber 79 to meet the intake requirements of the injection device, one side of the oil passage introduces high-pressure fuel into the oil tank 84 to meet the requirements of the injection device, and the other side of the oil passage introduces part of the fuel into the sealing ring 82 Seal gas. The gas nozzle 71 is made up of a gas needle valve spring 76, a gas needle valve 77, a gas chamber 79, a gas injection hole 80, and a sealing ring 82. An annular step is designed on the upper end of the gas needle valve 77, and a gas needle valve control chamber 63 is formed between the gas needle valve 77 and the injector body 6 under the annular step. The gas needle valve 77 and the gas needle valve limit rod 59 are installed coaxially, and the control oil enters the gas needle valve control cavity 63 through the central oil passage 60 on the gas needle valve limit rod 59 . The gas needle valve 77 is pressed on the needle valve base 73 to close the gas injection hole 80 under the pretightening force of the gas needle valve spring 76 . The gas passes through the solenoid valve sleeve 36 and the center air channel on the inner barrel 62 of the injection device in sequence from the pressurizing chamber 15 of the gas pressurizing part 1, and then enters the gas chamber 79 through the air channel 81 on the needle valve base 73. Above the gas chamber 79, a sealing ring 82 is designed between the gas needle valve 77 and the needle valve base 73, through the oil channel 78 on the needle valve base 73, part of the control oil is introduced to the sealing ring 82 to seal the gas. The fuel nozzle 72 mainly includes a fuel needle valve 83, an oil tank 84, and a fuel injection hole 85. The fuel needle valve 83 is pressed by the fuel piston spring seat 64 on the needle valve base 73 to close the fuel injection hole 85. The nozzle cover 75 and the injection device body 6 are threadedly connected and a sealing ring 74 is designed to prevent high temperature and high pressure gas in the cylinder from entering the injection device double needle valve nozzle part.

The gas nozzle of the combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention injects gas. When the gas needle valve is lifted and seated, the gas is easy to leak upward with the movement of the valve stem, and the leaked gas enters the gas. When the needle valve controls the cavity 63, the gas injection characteristics will be seriously affected due to the compressibility of the gas. In order to solve this problem, the combined mixed fuel injection device of the present invention has a sealing ring 82 between the gas needle valve 77 and the needle valve base 73, and controls the oil sealing gas through the introduction part of the oil passage, which can effectively prevent gas leakage. In addition, the control oil in the gas needle valve control cavity 63 and the sealing oil in the sealing ring 82 use the same oil, and the upper and lower oil pressures of the needle valve are equal, which can effectively ensure that the control oil and sealing oil have no static leakage.

When the engine is working, the control unit collects the input signal of the sensor, drives the boost solenoid valve 9, controls the gas solenoid valve 34 and controls the fuel solenoid valve 35 to work, thereby respectively controlling the gas boost, the gas injection by the gas nozzle 71 and the fuel injection by the fuel nozzle 72. When the solenoid valve 9 is powered off, the solenoid valve stem 22 is pressed against the right side baffle plate 24 under the action of the solenoid valve spring 20. At this time, the annular oil belt 21 communicates with the oil drain port 19 and the servo oil chamber 17, as shown in the figure As shown in 2(d), the servo oil in the servo oil chamber 17 flows to the low-pressure oil drain port 19, the pressure in the servo oil chamber 17 decreases, the booster piston 10 moves upward under the action of the return spring 11, and the gas pressure in the booster chamber 15 drops. The gas that enters the intake valve 14 from the gas inlet 13 pushes the intake valve stem 33, and the supercharging device starts to intake air; when the solenoid valve 9 is energized, the electromagnet 29 attracts the armature 25, and the armature 25 drives the solenoid valve stem 22 to the left At this time, the annular oil belt 21 communicates with the servo oil inlet 30 and the servo oil chamber 17, as shown in Figure 2(e), the servo oil enters the servo oil chamber 17, and the pressure in the servo oil chamber 17 gradually increases, pushing the pressurization Piston 10 descends, and the pressure in boost chamber 15 just begins to rise, and intake valve 14 promptly closes, and boost piston 10 continues descending to gas pressurization in boost chamber 15. The gas in the booster chamber 15 enters the gas chamber 81 of the gas nozzle 72 through the gas channel. When the control gas solenoid valve 34 is energized, the solenoid valve rod 44 is lifted, the high-pressure oil ring 48 is opened, the low-pressure oil ring 50 is closed, and the high-pressure oil flows through the high-pressure oil ring 48, the groove cavity 49, and the gas needle valve in sequence. The central oil channel 60 of the rod 59 flows into the gas needle valve control chamber 63, the gas needle valve 77 is lifted up rapidly under the action of the high-pressure oil in the gas needle valve control chamber 63, the gas injection hole 80 is opened, and the gas nozzle 71 starts to spray gas; When the solenoid valve 34 is powered off, the solenoid valve stem 44 is pressed against the sealing base 45 under the valve stem under the action of the solenoid valve spring 43, the high-pressure oil ring belt 48 is turned off, the low-pressure oil ring belt 50 is opened, and the gas needle valve control chamber 63 The high-pressure oil flows through the oil passage through the groove chamber 49 and the electromagnetic valve chamber 52 in sequence, and then flows from the oil passage 41 to the first low-pressure oil drain port 3, the oil pressure in the gas needle valve control chamber 63 decreases, and the gas needle valve 77 is in the position of the gas needle valve. The valve spring 76 is pressed down on the needle valve base 73 to close the gas injection hole 80, and the gas nozzle 71 stops spraying. When the control fuel solenoid valve 35 is powered off, the fuel control valve rod is pressed on the control valve seat under the action of the fuel control valve spring, and the high-pressure oil ring belt 57 is shut off. Under the action of the fuel piston spring 65, the fuel needle valve 83 is pressed by the fuel piston spring seat 64 on the needle valve base 73 to close the fuel injection hole 85, and the fuel nozzle 72 does not inject fuel; when the fuel solenoid valve 35 is energized, the fuel solenoid valve valve The lever is lifted, the high-pressure oil ring belt 34 is opened, and the high-pressure oil in the fuel piston control chamber 70 flows through the oil passage through the fuel groove chamber and the fuel solenoid valve chamber in sequence, and then flows from the oil passage 34 to the first low-pressure oil drain port 3, and the fuel oil The oil pressure in the piston control chamber 70 drops, the fuel needle valve 83 lifts up quickly to open the fuel injection hole 85, and the fuel nozzle 72 starts to inject fuel. According to the working conditions of the engine, the operating states and working sequences of the booster solenoid valve 9, the gas solenoid valve 34 and the fuel solenoid valve 35 can be selected to realize multiple oil and gas injection modes.

From the above working process, it can be seen that the combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device uses double needle valve nozzles to inject fuel, which saves space and simplifies the engine structure. The fuel injection process of the two nozzles is controlled by two solenoid valves respectively. When only one solenoid valve works, the injection device only injects fuel or gas; when two solenoid valves work at the same time, gas and fuel are injected at the same time; when two solenoid valves operate successively, the two fuels are injected sequentially. The gas injection process can be switched between supercharged and non-supercharged modes, the injection pressure is adjustable, and the fuel injection rule is flexible. Oil and gas mixing requirements under working conditions. The pressurized part adopts a pair of long sealing belts to enlarge the oil chamber to prevent gas leakage, the nozzle part adopts fuel oil sealing gas to effectively prevent gas leakage, and the control oil and sealing oil use the same oil to effectively prevent fuel from the control chamber and sealing ring belt static leak. Therefore, the invention can make the engine meet the increasingly stringent emission regulations, and effectively improve its power, economy and reliability.

The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device of the present invention comprises a gas booster part, a double electromagnetic valve part, a control part, a double needle valve nozzle part and a spray device housing. There is a high-pressure fuel inlet and two low-pressure oil drain ports on the injection device housing, and the gas inlet is designed in the pressurized part. The supercharging part mainly includes controlling the supercharging solenoid valve, supercharging piston, supercharging piston sleeve, piston return spring, intake valve, etc. The double solenoid valve part mainly includes a solenoid valve for controlling fuel oil and a solenoid valve for controlling gas. The two solenoid valves are installed in the same way, and they are both installed in the solenoid valve sleeve in the injection device body. The control part mainly includes the inner cylinder of the injection device, the gas needle valve limit rod, the gas needle valve spring, the gas needle valve control chamber, the fuel piston spring seat, the fuel piston spring, the fuel piston, the fuel piston sleeve, the fuel piston control chamber, etc. The components are all positioned and installed in the inner cylinder of the jetting device. The double needle valve nozzle part mainly includes gas nozzle, fuel nozzle, needle valve base, sealing ring, nozzle cover, etc., and the gas nozzle and fuel nozzle share a needle valve base.

The solenoid valve of the gas booster part includes a solenoid valve body, an electromagnet, a coil, a solenoid valve stem, a solenoid valve seat, an armature, a stop ring, a solenoid valve spring, a baffle, and the like. The coil and the electromagnet are installed in the solenoid valve body, the armature is located on the right side of the electromagnet, one end of the valve stem of the solenoid valve is stuck on the armature through the stop ring, and the other end is pressed against the baffle under the action of the spring force. The solenoid valve seat is designed with a servo oil inlet and drain port, and the solenoid valve stem is designed with an annular oil belt. When the solenoid valve is energized, the valve stem moves to the left, and the annular oil belt connects the servo oil inlet and the servo oil chamber. Enter the servo oil chamber; when the solenoid valve is powered off, the solenoid valve stem is pushed against the right baffle, the annular oil belt is connected to the servo oil chamber and the oil drain port, and the servo oil flows to the low-pressure oil drain port.

Control gas solenoid valve mainly includes electromagnet, electromagnet, coil, armature, solenoid valve stem, valve stem upper sealing base, valve stem lower sealing base, solenoid valve spring, stop ring, etc. An electromagnetic valve cavity is formed between the electromagnetic valve body and the upper sealing base of the valve stem, and a groove cavity is formed between the upper sealing base of the valve stem and the lower sealing base of the valve stem. The electromagnet is installed in the electromagnetic valve cavity, the armature is located below the electromagnet, one end of which is stuck on the armature through the stop ring, and the other end passes through the upper sealing base of the valve stem below the armature, and is pressed on the lower sealing base of the valve stem. The sealing base on the valve stem is designed with two oil passages, one oil passage connects the groove chamber and the solenoid valve chamber, and the other oil passage connects the solenoid valve chamber and the first low-pressure oil drain port, and the drain oil passage flows through the solenoid valve body. The sealing base under the valve stem is designed with two oil passages, one oil passage connects the high-pressure oil ring belt and the gas needle valve control chamber, and the other oil passage connects the oil chamber under the valve stem of the solenoid valve and the second low-pressure oil drain port.

There are two annular oil bands designed on the valve stem of the control gas solenoid valve. The lower annular oil band is connected to the high-pressure oil inlet through the oil passage, and the upper annular oil band is connected to the low-pressure oil drain port through the oil passage.

The control gas solenoid valve stem is designed with two sealing cones, the upper sealing cone seals the low-pressure oil ring, and the lower sealing cone seals the high-pressure oil ring. The solenoid valve stem is seated, the high-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the low-pressure oil circuit; the solenoid valve stem is lifted, the low-pressure oil circuit is shut off, and the gas needle valve control chamber is connected to the high-pressure oil circuit.

The fuel control solenoid valve mainly includes electromagnet, electromagnet, coil, armature, solenoid valve stem, valve stem seal base, solenoid valve spring seat, solenoid valve spring, stop ring, etc. A solenoid valve cavity is formed between the solenoid valve body and the spring seat of the solenoid valve, and a groove cavity is formed between the spring seat of the solenoid valve and the sealing base of the valve stem. The electromagnet is installed in the solenoid valve cavity, and the armature is located under the electromagnet. The solenoid valve stem is designed with a high-pressure oil ring belt, one end of which is stuck on the armature through the stop ring, and the other end runs through the spring seat of the solenoid valve under the armature. On the stem seal seat, close the high pressure oil annulus. Two oil passages are designed on the spring seat of the electromagnetic valve, one oil passage communicates with the groove chamber and the solenoid valve chamber, and the other oil passage communicates with the solenoid valve chamber and the first low-pressure oil drain port, and the oil drain passage flows through the solenoid valve body. There are two oil passages designed on the valve stem sealing base, one oil passage connects the high-pressure oil ring belt and the fuel piston control chamber, and the other oil passage connects the oil chamber below the valve stem of the solenoid valve and the second low-pressure oil drain port.

The upper end of the gas needle valve in the control part is designed with a circular step, the gas needle valve control cavity is formed between the needle valve and the injection device body under the circular step, and the lower end of the gas needle valve limit rod is set on the circular step of the gas needle valve Inside, the gas needle valve limit rod and the gas needle valve are provided with a central oil passage along the axis, and the gas needle valve control cavity communicates with the electromagnetic valve groove cavity through the oil passage.

The gas nozzle and the fuel nozzle share a high-pressure fuel inlet, and an annular oil groove is designed between the injection device body and the inner cylinder of the injection device to communicate with the fuel oil, the oil channel of the gas nozzle and the high-pressure oil inlet. The high-pressure oil enters the annular oil groove and is divided into two paths. One path of high-pressure oil flows into the fuel piston control chamber and the oil tank of the fuel nozzle through the oil passage; the other path of high-pressure oil flows into the high-pressure oil ring of the gas solenoid valve and the sealing ring of the gas nozzle through the oil passage. .

Above the gas chamber of the gas nozzle, an annular sealing belt is designed between the gas needle valve and the needle valve base, and an annular oil groove and an oil passage are opened on the needle valve base to introduce part of the control oil into the annular sealing belt.

Claims (5)

1. Combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device, which is characterized by: including gas booster part, gas injection part, fuel injection part, injection device body, solenoid valve sleeve, needle valve base, gas booster The part is installed above the injection device body, the solenoid valve sleeve is installed in the injection device body, the needle valve base is installed under the injection device body through the nozzle sleeve, and the needle valve base includes a gas base and a fuel base; The gas booster part includes a booster solenoid valve, a booster piston, a booster piston sleeve, and an intake valve, and the booster solenoid valve includes a booster solenoid valve seat, a booster electromagnet, a booster armature, and a booster solenoid valve stem. The booster solenoid valve seat is provided with a servo oil inlet port and a servo oil drain port. One end of the booster solenoid valve rod is fixed on the booster armature through a booster stop ring, and the other end passes through the booster solenoid valve seat and is in the sleeve. The pre-tightening force of the booster solenoid valve spring on it presses down on the baffle plate, the position of the booster armature forms a booster armature cavity, and the position of the booster solenoid valve spring forms a booster solenoid valve spring cavity, and the booster solenoid valve spring cavity is formed. The solenoid valve rod is provided with an annular oil belt, which realizes the connection or disconnection between the servo oil inlet port and the booster armature cavity and the connection between the servo oil drain port and the booster solenoid valve spring chamber through the movement of the booster solenoid valve rod. connected or disconnected; the booster piston is installed in the booster piston sleeve, and the booster piston sleeve is installed under the booster solenoid valve seat, and the servo oil is formed between the upper end of the booster piston, the booster piston sleeve and the booster solenoid valve seat. A booster chamber is formed between the lower end of the booster piston and the booster piston sleeve, and the booster piston spring is set on the booster piston; the intake valve is a one-way valve, installed in the booster piston sleeve, and the booster piston sleeve A gas inlet is arranged on the top, the gas inlet is connected to the intake valve, and the outlet of the intake valve is connected to the booster chamber; The gas injection part includes a control gas solenoid valve installed in the solenoid valve sleeve, a gas needle valve limit rod and a gas needle valve installed in the gas base. The control gas solenoid valve includes a gas solenoid valve body, a gas solenoid , gas armature, gas valve stem upper seal base, gas valve stem lower seal base, gas solenoid valve spring, gas solenoid valve stem, gas solenoid valve body, gas valve stem upper seal seat, gas valve stem lower seal seat and gas needle The valve limit rod is arranged from top to bottom, the gas solenoid valve cavity is formed between the gas solenoid valve body and the upper sealing base of the gas valve stem, and the gas groove cavity is formed between the upper sealing base of the gas valve stem and the lower sealing base of the gas valve stem. The gas solenoid is installed in the chamber of the gas solenoid valve, the gas armature is located below the gas solenoid, one end of the gas solenoid valve stem is stuck on the gas armature through the gas stop ring, and the other end runs through the gas valve stem under the gas armature to seal the base , and cooperate with the lower sealing base of the gas valve stem, the gas oil drain cavity is formed between the lower end of the gas solenoid valve stem and the lower sealing base of the gas valve stem, and the gas solenoid valve stem is respectively provided with the upper sealing base of the gas valve stem The matching gas upper sealing cone surface and the gas lower sealing cone surface matched with the gas valve stem lower sealing base, the part of the gas solenoid valve stem and the gas valve stem upper sealing base that cooperates forms a gas low-pressure oil ring belt, and the gas solenoid valve valve The part where the rod matches the lower sealing base of the gas valve stem forms a gas high-pressure oil ring belt, the first gas oil channel and the fourth gas oil channel are set on the upper sealing base of the gas valve stem, and the second gas oil channel is set on the lower sealing base of the gas valve stem. The oil channel and the third oil channel for gas, the fifth oil channel for gas is set in the solenoid valve sleeve, the high-pressure oil inlet, the first low-pressure oil drain port and the second low-pressure oil drain port are set on the injection device body, the first oil channel for gas is connected to the gas The solenoid valve cavity and the first low-pressure oil drain port, the second gas oil channel is connected to the gas high-pressure oil ring belt and the high-pressure oil inlet, the central oil channel is set in the gas needle valve limit rod, and the third gas oil channel is connected to the gas groove cavity and The central oil channel, the fourth gas oil channel is connected to the gas low-pressure oil ring belt and the gas solenoid valve cavity, the gas oil drain cavity is connected to the second low-pressure oil drain port, the gas needle valve is located under the gas needle valve limit rod, the gas needle valve is connected to the gas valve A sealing ring and a gas chamber are respectively formed between the bases, the sealing ring is connected to the high-pressure oil inlet through the fifth gas oil channel, the gas chamber is connected to the pressurization chamber through the gas channel in the solenoid valve sleeve, and gas injection holes are arranged at the end of the gas base; The fuel injection part includes a control fuel solenoid valve installed in a solenoid valve sleeve, a fuel piston and a fuel needle valve installed in a fuel base. The control fuel solenoid valve includes a fuel solenoid valve body, a fuel solenoid, a fuel armature, Fuel valve stem upper seal base, fuel valve stem lower seal base, fuel solenoid valve spring, fuel solenoid valve stem, fuel valve stem upper seal base, fuel valve stem lower seal base and fuel piston are arranged from top to bottom, fuel solenoid valve A fuel solenoid valve cavity is formed between the body and the upper sealing base of the fuel valve stem, and a fuel groove cavity is formed between the upper sealing base of the fuel valve stem and the lower sealing base of the fuel valve stem. The fuel solenoid is installed in the fuel solenoid valve cavity, and the fuel armature Located below the fuel solenoid, one end of the valve stem of the fuel solenoid valve is stuck on the fuel armature through the fuel stop ring, and the other end passes through the upper sealing base of the fuel valve stem under the fuel armature. The base matches the fuel lower sealing taper, the fuel solenoid valve stem matches the fuel valve stem lower sealing base to form a fuel high-pressure oil ring belt, and the fuel valve stem upper sealing base is set to communicate with the fuel solenoid valve cavity and the fuel groove. cavity of the fuel valve stem upper sealing base channel, the fuel solenoid valve cavity is connected to the first low-pressure oil drain port, the fuel drain cavity is formed between the lower end of the fuel solenoid valve stem and the lower sealing base of the fuel valve stem, and the fuel drain cavity is connected to the second Two low-pressure oil drain ports, the upper end of the fuel piston is covered with a fuel piston sleeve, the fuel piston sleeve is located between the lower sealing base of the fuel valve stem and the fuel piston, and the fuel piston control chamber is formed between the fuel piston and the fuel piston sleeve above it, and the fuel piston The control chamber communicates with the fuel high-pressure oil ring belt through the fuel oil channel. The fuel piston is covered with a fuel piston spring. The fuel needle valve is located under the fuel piston. An oil tank is formed between the fuel needle valve and the fuel base, and the oil tank is connected to the high-pressure fuel inlet. . 2. The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 1, characterized in that: the upper end of the gas needle valve is designed with a circular step, and the bottom of the circular step and the injection device body A gas needle valve control chamber is formed, the lower end of the gas needle valve limit rod is sleeved inside the circular step of the gas needle valve, and the gas needle valve control chamber communicates with the central oil passage. 3. The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 1 or 2, characterized in that: when the control gas solenoid valve is not energized, the gas solenoid valve stem acts on the gas solenoid valve spring. Press down on the lower sealing base of the gas valve stem, the gas high-pressure oil ring is closed, the gas low-pressure oil ring is opened, and the gas needle valve control chamber is connected to the first low-pressure oil drain port; when the control gas solenoid valve is energized, the gas solenoid valve valve The rod lifts up and presses on the sealing base on the gas valve rod, the gas low-pressure oil ring is closed, the gas high-pressure oil ring is opened, and the gas needle valve control chamber is connected with the high-pressure oil inlet. 4. The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 1 or 2, characterized in that: when the control fuel solenoid valve is not powered, the fuel solenoid valve stem acts on the fuel solenoid valve spring. Press down on the lower sealing base of the fuel valve stem, and the fuel oil passage is disconnected from the fuel groove cavity. When the control fuel solenoid valve is energized, the fuel solenoid valve stem lifts, and the fuel oil passage communicates with the fuel groove cavity. 5. The combined electromagnetic fuel injection-supercharged electromagnetic jet mixed fuel injection device according to claim 3, characterized in that: when the control fuel solenoid valve is not energized, the fuel solenoid valve stem is pressed down by the fuel solenoid valve spring. On the sealing base under the fuel valve stem, the fuel oil channel is disconnected from the fuel groove cavity, and when the control fuel solenoid valve is energized, the fuel solenoid valve stem lifts, and the fuel oil channel communicates with the fuel groove cavity.