CN112459941B - Piezoelectric Common Rail Injector with Direct Control of Injector Switch - Google Patents
Piezoelectric Common Rail Injector with Direct Control of Injector Switch Download PDFInfo
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- CN112459941B CN112459941B CN202011223368.6A CN202011223368A CN112459941B CN 112459941 B CN112459941 B CN 112459941B CN 202011223368 A CN202011223368 A CN 202011223368A CN 112459941 B CN112459941 B CN 112459941B
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- 238000007789 sealing Methods 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 238000003825 pressing Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims 2
- 239000003921 oil Substances 0.000 description 94
- 239000000446 fuel Substances 0.000 description 26
- 239000000295 fuel oil Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a piezoelectric type common rail oil sprayer for directly controlling an oil nozzle switch, which comprises a piezoelectric stack, an oil sprayer body, an integral needle valve, a sealing pin, a guide block, a positioning sleeve, a cushion block, a lever, a spring force adjusting gasket and a return spring, wherein the sealing pin, the guide block, the positioning sleeve, the cushion block, the lever, the spring force adjusting gasket and the return spring are arranged in an inner cavity of the oil sprayer body; the guide block, the positioning sleeve and the cushion block are fixed in the inner cavity of the oil sprayer body and are sequentially arranged from top to bottom; a first inner hole is formed in the guide block; the sealing pin is an I-shaped piece and is positioned below the piezoelectric stack, and the middle part of the sealing pin is inserted into the first inner hole of the guide block; a rectangular hole is formed in the positioning sleeve, the lever is positioned in the rectangular hole and is positioned below the sealing pin, and the longitudinal section of the lever comprises three fulcrums c, d and e; the lever is connected with the integral needle valve and drives the integral needle valve to move upwards under the action of the downward force of the sealing pin; the spring force adjusting gasket and the return spring are sleeved on the integral needle valve. The invention has simple structure and effectively solves the problem that the service life of the electronic element is influenced by long-time electrifying work in the prior art.
Description
Technical Field
The invention belongs to the technical field of an electric control common rail oil injection system of a diesel engine, and relates to a piezoelectric type common rail oil injector for directly controlling an oil injection nozzle switch.
Background
A common rail fuel injection system of a diesel engine is an intelligent fuel injection system controlled by an electronic computer, and is the only choice for the diesel engine to reach the emission standards of the fifth and sixth countries.
At present, the injection pressure of a diesel engine is 180-220 MPa, the hydraulic pressure acting on a nozzle needle valve is very large, the expansion amount of a piezoelectric stack is very small and ranges from 0.04 to 0.06, and the lift of the nozzle is 0.2-0.3, so that the lift of the piezoelectric stack must be amplified. In the prior common rail oil injector controlled by piezoelectric crystals under a servo control method, a piezoelectric stack indirectly controls the opening and closing of an oil injection nozzle through a pilot valve, but the opening and closing speed of a needle valve is slow through a servo valve, so that the oil supply rate is influenced, and the emission index of the diesel engine is influenced. In addition, the common rail oil sprayer controlled by the piezoelectric crystal is complex in structure and difficult to process, an oil supply curve changes along with the oil supply pressure, and the oil sprayer is difficult to adjust.
Therefore, in recent years, common rail fuel injectors (hereinafter referred to as piezoelectric direct control fuel injectors) in which a piezoelectric stack directly controls opening and closing of a fuel injection nozzle have been developed abroad to improve common rail fuel injection systems of diesel engines, and delfu corporation, usa, and continental germany have produced the devices in large quantities.
In the piezoelectric direct-control oil injector of Delfu company, a small piston is arranged at the upper end of an oil nozzle, after a piezoelectric stack is electrified, the small piston is directly moved downwards to be pressed on high-pressure fuel oil in a low high-pressure cavity, and the high-pressure fuel oil presses a conical surface of an integral needle valve of the oil nozzle on a conical surface of a valve seat, so that the oil nozzle does not inject oil.
When the piezoelectric stack is powered off, the piezoelectric stack retracts to enable the small piston to ascend, the volume of the high-pressure containing cavity is increased, the integral needle valve lifts the integral needle valve under the action of high-pressure fuel oil below the integral needle valve, the integral needle valve presses the high-pressure fuel oil, the oil nozzle is opened, the high-pressure fuel oil is sprayed to the combustion chamber through the conical surface gap and the spray hole, and the ascending distance of the integral needle valve is the area ratio of the lift of the piezoelectric stack multiplied by the guide diameter of the small piston and the integral needle valve. The working modes of power-off oil injection and power-on oil stop of the piezoelectric direct-control oil injector are opposite to the working modes of power-on oil injection and power-off oil stop of a common piezoelectric oil injector, and because the working voltage of the piezoelectric stack is more than 150 volts, long-time power-on operation has great influence on the service life of electronic elements, a new technology needs to be researched to solve the problem.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a piezoelectric type common rail oil sprayer for directly controlling an oil nozzle switch.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a piezoelectric common rail oil sprayer for directly controlling an oil nozzle switch comprises a piezoelectric stack, an oil sprayer body, an integral needle valve, a valve seat, a sealing pin, a guide block, a positioning sleeve, a cushion block, a lever, a spring force adjusting gasket and a return spring, wherein the sealing pin, the guide block, the positioning sleeve, the cushion block, the lever, the spring force adjusting gasket and the return spring are arranged in an inner cavity of the oil sprayer body;
the guide block, the positioning sleeve and the cushion block are fixed in the inner cavity of the oil sprayer body and are sequentially arranged from top to bottom; a first inner hole is formed in the guide block, and a second inner hole is formed in the cushion block;
the sealing pin is an I-shaped piece and is positioned below the piezoelectric stack, the middle part of the sealing pin is inserted into the first inner hole of the guide block, and the length of the sealing pin is greater than the depth of the first inner hole of the guide block;
a rectangular hole is formed in the positioning sleeve, the positioning sleeve is positioned by a positioning pin, the orthographic projection of the lever from top to bottom is rectangular, and the lever is in movable fit with the rectangular hole in the positioning sleeve;
the lever is positioned in a cavity defined by the guide block, the rectangular hole in the positioning sleeve and the cushion block, the longitudinal section of the lever comprises three fulcrums c, d and e, the fulcrum c and the fulcrum e are positioned above the lever, the fulcrum d is positioned below the lever, and the projection of the fulcrum d in the vertical direction is positioned between the fulcrum c and the fulcrum e;
a gap is arranged on the lever; the integral needle valve is vertically arranged, the integral needle valve penetrates through a second inner hole of the cushion block, the part above the cushion block is a groove, and a gap of the lever is inserted into the groove of the integral needle valve;
fulcrum c of the lever longitudinal section props up the seal pin, fulcrum e props up the up end of recess, fulcrum d props up the upper surface of cushion, and the shape and the structure of lever and whole needle valve satisfy: when the seal pin applies a downward acting force to the fulcrum c, the lever can rotate around the fulcrum d, and the fulcrum e can apply an upward acting force to the upper end face 7.2 of the groove in the rotating process, so that the integral needle valve is driven to move upwards; the positions of the fulcrums c, d and e are used for adjusting the distances between the lever and the upper end faces of the sealing pin and the groove, so that the conical surface of the integral needle valve is tightly pressed on the conical surface of the valve seat under the action of the return spring when the piezoelectric stack is not electrified, and the oil nozzle does not spray oil;
the spring force adjusting gasket and the return spring are sleeved on the integral needle valve, the spring force adjusting gasket is located below the cushion block, and the return spring is located between the cushion block and the spring force adjusting gasket.
As a preferred technical scheme:
in the piezoelectric common rail injector for directly controlling the opening and closing of the injection nozzle, the center line of the piezoelectric stack is not coaxial with the center line of the injector body and is offset by a certain distance M.
The piezoelectric type common rail oil injector for directly controlling the opening and closing of the oil injection nozzle further comprises a pressing sleeve; the piezoelectric stack is pressed on the oil injector body through the pressing sleeve.
The piezoelectric type common rail oil injector directly controlling the opening and closing of the oil injection nozzle has the advantages that the inner cavity of the oil injector body is the central oil hole; the oil injector body is provided with an oil inlet hole communicated with the central oil hole and an oil tank communicated with the oil inlet hole.
According to the piezoelectric type common rail oil injector for directly controlling the opening and closing of the oil injection nozzle, the clearance between the integral needle valve and the second inner hole of the cushion block is larger than 0; the gap between the integral needle valve and the gap of the lever is more than 0; the middle part of the sealing pin is matched with the first inner hole of the guide block through a matching part, and high-pressure fuel in the fuel injector body can be sealed.
According to the piezoelectric type common rail oil injector for directly controlling the opening and closing of the oil injection nozzle, the guide block is internally provided with the oil return hole for communicating the space above the guide block with the oil tank, and a small amount of fuel oil flowing out of the gap between the sealing pin and the first inner hole of the guide block can return to the oil tank through the oil return hole.
According to the piezoelectric type common rail fuel injector for directly controlling the opening and closing of the fuel injection nozzle, the upper surface and the lower surface of the positioning sleeve, the lower surface of the guide block and the upper surface of the cushion block are high-precision planes so as to seal high-pressure fuel in the fuel injector body.
According to the piezoelectric type common rail oil sprayer for directly controlling the opening and closing of the oil nozzle, the valve seat is internally provided with the third inner hole, the lower portion of the integral needle valve is inserted into the third inner hole, the third inner hole is divided into the upper section, the middle section and the lower section, the upper section is communicated with the central oil hole and is of the triangular section, the middle section and the integral needle valve enclose the oil containing groove, and the gap between the lower section and the integral needle valve is larger than 0.
The working principle of the piezoelectric type common rail oil sprayer for directly controlling the opening and closing of the oil nozzle is as follows:
in the initial state, high-pressure fuel oil is led to the central oil hole from the oil inlet hole, upwards passes through the return spring and the notch on the lever to the upper part of the lever, is sealed in the oil injector body, downwards passes through the triangular section of the integral needle valve, reaches the oil containing groove to the cone of the integral needle valveThe hydraulic pressure acting on the integral needle valve is
In the formula, D is the sealing diameter of the conical surface of the integral needle valve and the conical surface of the valve seat, P is the high-pressure fuel pressure in the fuel injector body (180-220 MPa in the embodiment), and at the moment, the conical surface of the integral needle valve is pressed on the conical surface of the valve seat, and the fuel nozzle does not inject fuel.
When the piezoelectric stack starts to be electrified, the piezoelectric stack extends to press the sealing pin which is propped against the fulcrum c to enable the lever to rotate downwards around the fulcrum d, the fulcrum e acts on the upper end surface of the groove of the integral needle valve and exceeds the upward force acting on the fulcrum e
And when the spring force is positive, the conical surface of the integral needle valve leaves the conical surface of the valve seat, and the oil nozzle starts to spray oil.
When the piezoelectric stack starts to be powered off, the piezoelectric stack retracts, the sealing pin stops applying pressure to the lever, upward force acting on the fulcrum e disappears, the integral needle valve moves downwards under the action of the return spring until the initial state is restored, the conical surface of the integral needle valve is pressed on the conical surface of the valve seat at the moment, the oil nozzle does not spray oil, and the integral needle valve drives the lever to rotate upwards around the fulcrum d in the process, so that the lever and the sealing pin are reset.
Note that a powerful return spring is designed to accelerate the seating speed of the integral needle valve, and meanwhile, the integral needle valve is lightened as much as possible under the condition of ensuring the rigidity.
Has the advantages that:
the invention changes the electrified downward movement of the piezoelectric stack into the upward movement of the integral needle valve without using a piston but directly through a reverse lever, thereby leading an oil nozzle to spray oil, simultaneously adjusting the eccentricity M between the center line of the piezoelectric stack and the center line of an oil sprayer body and adjusting the relative positions of three fulcrums c, d and e of the longitudinal section of the lever, and enlarging the lever ratio to about 5-6 so as to amplify the lift range of the piezoelectric stack from 0.05-0.06 to 0.2-0.3 and meet the requirements of modern diesel engines.
Because the acting force is larger after the piezoelectric stack is electrified, and the pressure is about 4000-10000 newtons according to the diameter of the piezoelectric stack, the integral needle valve is combined with the control rod into a whole, so that the lever does not pass through a small piston to directly lift the integral needle valve, and meanwhile, the guide sealing diameter of the integral needle valve is changed into a triangle, so that high-pressure fuel in the fuel injector body directly passes through a gap at the triangle of the integral needle valve and is led to the conical surface of the integral needle valve and the valve seat, and the guide sealing diameter of the integral needle valve only plays a guide role, thereby simplifying the structure of the fuel injector.
Drawings
FIG. 1 is a schematic structural diagram of a piezoelectric common rail injector for directly controlling the opening and closing of an injection nozzle according to the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 1;
FIG. 4 is a front view of the lever;
the fuel injector comprises a fuel injector body, a piezoelectric stack, a fuel injector body, a guide block, a positioning sleeve, a lever, a notch, a needle valve, a groove, a guide block, a valve seat, a triangular section, a valve seat, a spring seat, a positioning pin, a spring force adjusting gasket, a return spring, a cushion block, a fuel inlet, an oil return hole, a sealing pin, a positioning pin, a lever and a spring, wherein the fuel injector body comprises 1-the piezoelectric stack, 2-the pressing sleeve, 3-the fuel injector body, 4-the guide block, 5-the positioning sleeve, 6-the lever, 6.1-the notch, 7-the integral needle valve, 7.1-the groove, 7.2-the upper end surface of the groove, 8-the valve seat, 9-the triangular section, 10-the conical surface of the valve seat, 11-the conical surface of the integral needle valve, 12-the fuel tank, 13-the central oil hole, 14-the spring force adjusting gasket, 15-the return spring force adjusting gasket, 16-the cushion block, 17-the fuel inlet, 18-the oil return hole, 19-the positioning pin, and the positioning pin, wherein M are three pivot points of the longitudinal section of the lever.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A piezoelectric common rail injector for directly controlling the opening and closing of an oil nozzle is shown in figure 1 and comprises a piezoelectric stack 1, a pressing sleeve 2, an injector body 3, an integral needle valve 7 (a conical surface 11 of the integral needle valve is positioned at the bottom), a valve seat 8 (a conical surface 10 of the valve seat is positioned at the bottom), a sealing pin 19, a guide block 4, a positioning sleeve 5, a cushion block 16, a lever 6, a spring force adjusting gasket 14, a return spring 15 and a positioning pin 20;
the piezoelectric stack 1 is pressed on the oil injector body 3 through the pressing sleeve 2; the center line of the piezoelectric stack 1 and the center line of the oil injector body 3 are not coaxial and offset by a certain distance M;
the inner cavity of the oil injector body 3 is a central oil hole 13; the oil injector body 3 is provided with an oil inlet hole 17 communicated with the central oil hole 13 and an oil tank communicated with the oil inlet hole 17;
the sealing pin 19, the guide block 4, the positioning sleeve 5, the cushion block 16, the lever 6, the spring force adjusting gasket 14 and the return spring 15 are arranged in the inner cavity of the oil injector body 3;
the guide block 4, the positioning sleeve 5 and the cushion block 16 are arranged and fixed in the inner cavity of the oil sprayer body 3 from top to bottom; a first inner hole and an oil return hole 18 for communicating the space above the guide block 4 with an oil tank are arranged in the guide block 4; the positioning sleeve 5 determines the position of the positioning sleeve in the oil injector body 3 through a positioning pin 20, and the upper surface and the lower surface of the positioning sleeve are high-precision planes; a second inner hole is formed in the cushion block 16; the lower surface of the guide block 4 and the upper surface of the cushion block 16 are high-precision planes;
the seal pin 19 is an I-shaped member, is positioned below the piezoelectric stack 1, and has a middle part inserted into the first inner hole of the guide block 4 (a matching member is arranged between the two parts), and has a length greater than the depth of the first inner hole of the guide block 4;
a rectangular hole is formed in the positioning sleeve 5, the positioning sleeve 5 is positioned by the positioning pin 20, and the orthographic projection of the lever 6 from top to bottom is rectangular and is in movable fit with the rectangular hole in the positioning sleeve 5;
as shown in fig. 2 to 4, the lever 6 is located in a cavity surrounded by the guide block 4, the rectangular hole in the positioning sleeve 5 and the cushion block 16, and a longitudinal section of the lever includes three fulcrums c, d and e, the fulcrum c and the fulcrum e are located above, the fulcrum d is located below, and a projection of the fulcrum d in the vertical direction is located between the fulcrum c and the fulcrum e;
a gap 6.1 is arranged on the lever 6; the integral needle valve 7 is vertically arranged, penetrates through a second inner hole of the cushion block 16, a groove 7.1 is formed in the part above the cushion block 16, and a notch 6.1 of the lever is inserted into the groove 7.1 of the integral needle valve; wherein the clearance between the integral needle valve 7 and the second inner hole of the cushion block 16 is more than 0; the clearance between the integral needle valve 7 and the notch 6.1 of the lever 6 is more than 0;
the fulcrum c of the longitudinal section of the lever 6 is propped against the sealing pin 19, the fulcrum e is propped against the upper end face 7.2 of the groove, the fulcrum d is propped against the upper surface of the cushion block 16, and the shape and the structure of the lever 6 and the integral needle valve 7 meet the following requirements: when the seal pin 19 applies a downward acting force to the fulcrum c, the lever 6 can rotate around the fulcrum d, and the fulcrum e can apply an upward acting force to the upper end surface 7.2 of the groove in the rotating process, so that the integral needle valve 7 is driven to move upwards;
as shown in fig. 1, a spring force adjusting gasket 14 and a return spring 15 are sleeved on the integral needle valve 7, the spring force adjusting gasket 14 is positioned below a cushion block 16, and the return spring 15 is positioned between the cushion block 16 and the spring force adjusting gasket 14;
the valve seat 8 is provided with a third inner hole, the lower part of the integral needle valve 7 is inserted into the third inner hole, the third inner hole is divided into an upper section, a middle section and a lower section, the upper section is communicated with the central oil hole 13 and is a triangular section 9, the middle section and the integral needle valve 7 enclose an oil containing groove 12, and the gap between the lower section and the integral needle valve 7 is larger than 0.
The piezoelectric type common rail oil injector for directly controlling the opening and closing of the oil nozzle has a simple structure, and changes the downward motion of the electrified piezoelectric stack into the upward motion of the integral needle valve directly through the reverse lever without using a piston, so that the oil nozzle injects oil, and the requirements of modern diesel engines are met.
Claims (8)
1. The piezoelectric common rail oil injector for directly controlling the opening and closing of the oil nozzle comprises a piezoelectric stack (1), an oil injector body (3), an integral needle valve (7) and a valve seat (8), and is characterized by further comprising a sealing pin (19), a guide block (4), a positioning sleeve (5), a cushion block (16), a lever (6), a spring force adjusting gasket (14) and a return spring (15), wherein the sealing pin is arranged in the inner cavity of the oil injector body (3);
the guide block (4), the positioning sleeve (5) and the cushion block (16) are fixed in the inner cavity of the oil sprayer body (3) and are sequentially arranged from top to bottom; a first inner hole is formed in the guide block (4), and a second inner hole is formed in the cushion block (16);
the sealing pin (19) is an I-shaped piece and is positioned below the piezoelectric stack (1), the middle part of the sealing pin is inserted into the first inner hole of the guide block (4), and the length of the sealing pin is greater than the depth of the first inner hole of the guide block (4);
a rectangular hole is formed in the positioning sleeve (5), the positioning sleeve (5) is positioned by the positioning pin (20), the orthographic projection of the lever (6) from top to bottom is rectangular, and the lever (6) is in movable fit with the rectangular hole in the positioning sleeve (5);
the lever (6) is positioned in a cavity defined by the guide block (4), the rectangular hole in the positioning sleeve (5) and the cushion block (16), the longitudinal section of the lever comprises three fulcrums c, d and e, the fulcrum c and the fulcrum e are positioned above, the fulcrum d is positioned below, and the projection of the fulcrum d in the vertical direction is positioned between the fulcrum c and the fulcrum e;
a notch (6.1) is arranged on the lever (6); the integral needle valve (7) is vertically arranged, a groove (7.1) penetrates through a second inner hole of the cushion block (16) and is positioned above the cushion block (16), and a notch (6.1) of the lever is inserted into the groove (7.1) of the integral needle valve;
fulcrum c of the longitudinal section of the lever (6) is propped against the sealing pin (19), fulcrum e is propped against the upper end face (7.2) of the groove, fulcrum d is propped against the upper surface of the cushion block (16), and the shape and the structure of the lever (6) and the integral needle valve (7) meet the following requirements: when the sealing pin (19) applies a downward acting force to the fulcrum c, the lever (6) can rotate around the fulcrum d, and the fulcrum e can apply an upward acting force to the upper end surface (7.2) of the groove in the rotating process, so that the integral needle valve (7) is driven to move upwards;
a spring force adjusting gasket (14) and a return spring (15) are sleeved on the integral needle valve (7), the spring force adjusting gasket (14) is positioned below the cushion block (16), and the return spring (15) is positioned between the cushion block (16) and the spring force adjusting gasket (14);
the positions of the fulcrums c, d and e are used for adjusting the distance between the lever and the upper end face of the sealing pin and the upper end face of the groove, so that the conical surface of the integral needle valve is tightly pressed on the conical surface of the valve seat under the action of the return spring when the piezoelectric stack is not electrified, and the oil nozzle does not spray oil.
2. Piezoelectric common rail injector with direct control of the opening and closing of the injector nozzle according to claim 1, characterized in that the centre line of the piezoelectric stack (1) is not coaxial with the centre line of the injector body (3) and is offset by a distance M.
3. The piezoelectric common rail injector for direct control of the opening and closing of an injection nozzle according to claim 1, further comprising a pressure sleeve (2); the piezoelectric stack (1) is pressed on the oil injector body (3) through the pressing sleeve (2).
4. The piezoelectric common rail injector for directly controlling the opening and closing of the injection nozzle according to claim 1, wherein the inner cavity of the injector body (3) is a center oil hole (13); an oil inlet hole (17) communicated with the central oil hole (13) and an oil tank communicated with the oil inlet hole (17) are arranged on the oil injector body (3).
5. The piezoelectric common rail injector for directly controlling the opening and closing of the injection nozzle according to claim 4, wherein a clearance between the integral needle valve (7) and the second inner hole of the spacer (16) is greater than 0; the clearance between the integral needle valve (7) and the gap (6.1) of the lever (6) is more than 0; the middle part of the sealing pin (19) is matched with the first inner hole of the guide block (4) by a matching part.
6. The piezoelectric common rail injector for directly controlling the opening and closing of the injection nozzle according to claim 5, characterized in that an oil return hole (18) communicating a space above the guide block (4) and an oil tank is provided in the guide block (4).
7. The piezoelectric common rail injector for directly controlling the opening and closing of the injection nozzle according to claim 5, wherein the upper surface and the lower surface of the positioning sleeve (5), the lower surface of the guide block (4), and the upper surface of the spacer block (16) are high-precision flat surfaces.
8. The piezoelectric type common rail injector for directly controlling the opening and closing of the oil nozzle according to claim 4, wherein a third inner hole is formed in the valve seat (8), the lower portion of the integral needle valve (7) is inserted into the third inner hole, the third inner hole is divided into an upper section, a middle section and a lower section, the upper section is communicated with the central oil hole (13) and is a triangular section (9), the middle section and the integral needle valve (7) enclose an oil containing groove (12), and a gap between the lower section and the integral needle valve (7) is larger than 0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223368.6A CN112459941B (en) | 2020-11-05 | 2020-11-05 | Piezoelectric Common Rail Injector with Direct Control of Injector Switch |
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| CN202011223368.6A CN112459941B (en) | 2020-11-05 | 2020-11-05 | Piezoelectric Common Rail Injector with Direct Control of Injector Switch |
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| CN112459941B true CN112459941B (en) | 2021-11-12 |
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| CN1833101A (en) * | 2003-06-11 | 2006-09-13 | 韦斯波特研究公司 | Valve device and method for injecting a gaseous fuel |
| EP1760305A1 (en) * | 2005-09-06 | 2007-03-07 | Siemens Aktiengesellschaft | Fuel injection valve |
| DE102006031372A1 (en) * | 2006-07-06 | 2008-01-10 | Siemens Ag | Fuel injector, for an internal combustion motor, has a lever conversion system between the actuator and the jet needle with movement to compensate for a fuel pressure drop |
| JP2010223198A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection valve |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2787144A1 (en) * | 1998-12-14 | 2000-06-16 | Siemens Ag | LEVER TRANSMITTER |
| JP2003293898A (en) * | 2002-04-05 | 2003-10-15 | Denso Corp | Fuel injection device |
| WO2004076848A1 (en) * | 2003-02-27 | 2004-09-10 | Siemens Aktiengesellschaft | Valve with a lever, lever and method for the production of a lever |
| CN1833101A (en) * | 2003-06-11 | 2006-09-13 | 韦斯波特研究公司 | Valve device and method for injecting a gaseous fuel |
| EP1760305A1 (en) * | 2005-09-06 | 2007-03-07 | Siemens Aktiengesellschaft | Fuel injection valve |
| DE102006031372A1 (en) * | 2006-07-06 | 2008-01-10 | Siemens Ag | Fuel injector, for an internal combustion motor, has a lever conversion system between the actuator and the jet needle with movement to compensate for a fuel pressure drop |
| JP2010223198A (en) * | 2009-03-25 | 2010-10-07 | Denso Corp | Fuel injection valve |
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