CN108425832A - A kind of normally closed intake valve of air compressor - Google Patents

Abstract

The invention relates to a normally closed intake valve of an air compressor, comprising a valve body, the valve body is provided with a pressure inlet hole, a pressure relief hole and a cavity in the valve body, and the pressure inlet hole is connected with a gas pipeline interface , the valve body is connected with an upper cover body, an air inlet is arranged on the upper cover body, a piston is arranged in the cavity, a piston cap is fixed on the cavity body, and a sealing top is also included, the sealing top is sleeved on the piston, and the sealing top and the The socket of the piston is provided with an emergency stop spring, and the bottom of the piston and the cavity is provided with a return spring. The solenoid valve is connected to the valve body, and there are sealing rings on the sealing top, piston and piston cap. The upper cover body O-ring is provided, and the present invention discharges the internal pressure of the air compressor through the pressure relief hole through the piston, the piston cap and the hollow pipeline inside the sealing top, so as to realize the purpose of pressure relief. A gap will be formed between the middle sealing top and the O-ring of the upper body cover, through which the air intake valve can be supplemented to ensure oil circulation.

Description

Air compressor normally closed intake valve

technical field

The utility model relates to an accessory of an air compressor, in particular to a normally closed intake valve of the air compressor.

Background technique

The screw air compressor intake valve is an important part of the air compressor, which is used for the intake control of the air compressor. It usually also includes a solenoid valve and a discharge valve, which are connected by pipelines. The Chinese patent document with the authorized announcement number CN202768393U discloses a screw air compressor intake valve, which includes a valve body with an air intake hole, an inner cavity and a pressure relief hole. The valve body includes a lower valve body and an upper valve body. It is characterized in that: the lower valve body is provided with an O-ring groove, an O-ring is placed in the O-ring groove, a cylinder body is arranged inside the inner cavity, a sealing top surface is arranged on the upper part of the cylinder body, and the cylinder body is installed There is a gland and a piston. There is a relief valve on the side of the valve body. The valve core, aluminum guide post and sealing ring are arranged in the relief valve. The upper part of the relief valve is connected with the solenoid valve. The air hole and the lower exhaust hole, the battery valve controls the air intake hole of the upper valve body through the upper exhaust hole and the lower exhaust hole. The sealing top surface on the cylinder block is in contact with the valve body at the end of the air intake port to close the air intake port.

However, when the air compressor inlet valve of the prior art is in use, the sealing performance is relatively poor, and the air supply method of the inlet valve is relatively complicated, which easily leads to the occurrence of air leakage of the inlet valve, and the structure of the prior art is relatively complicated, and the leakage There are many points, and the operation is troublesome.

Utility model content

The utility model is to provide a normally closed intake valve of an air compressor, which solves the problem of poor sealing performance of the intake valve in the prior art, relatively complicated air supply mode of the intake valve, complex structure, and many leakage points. question.

The technical scheme of the utility model is as follows: a normally closed air intake valve of an air compressor, including a valve body, the valve body is provided with a pressure inlet hole, a pressure relief hole and a cavity in the valve body, and the inlet pressure The hole is connected with a gas pipeline interface, and the valve body is fixedly connected with an upper cover body by bolts, and an air inlet hole is arranged on the upper cover body, and it is characterized in that: a piston is arranged in the cavity, and the cavity opening is The end is fixedly connected with a piston cap, the piston can be slidably set relative to the piston cap, and also includes a sealing top, the sealing top is sleeved on the piston, and an emergency stop spring is arranged at the socket between the sealing top and the piston, and the connection between the piston and the cavity The bottom is provided with a return spring. One end of the return spring is against the bottom of the cavity and the other end is against the piston. The internal pipelines of the piston, the piston cap and the sealing top are all set to be hollow. The sealing top can be moved relative to the piston and the sealing top The air inlet hole in the upper cover body, the pressure inlet hole communicates with the closed space formed between the piston and the piston cap, and also includes a solenoid valve and several sealing rings, the solenoid valve is connected to the outer surface of the valve body, and the solenoid valve Located between the pressure inlet hole and the gas pipeline interface, the sealing top, the piston and the piston cap are all provided with sealing rings, the air inlet hole in the upper cover is provided with an upper cover O-ring, and the inlet Both the pressure hole and the pressure relief hole are connected to the gas pipeline interface. When the gas pressure is discharged from the solenoid valve, the sealing top and the upper body cover O-ring are separated. When the emergency shutdown occurs, the sealing top and the upper body cover O-ring Set snugly between the circles.

The utility model is further configured as follows: the piston is provided with two grooves, and an upper sealing ring and a lower sealing ring are respectively installed in the grooves.

The utility model is further configured as follows: the pressure relief hole is set in a 'cross' shape, one of the pressure relief holes is connected to the cavity, the hole opposite to it is sealed by bolts, and the other hole is connected to the outside world. The other hole seal is arranged opposite it.

The utility model is further set as: the valve body is provided with an exhaust adjustment hole for adjusting the exhaust volume, the exhaust adjustment hole is connected to the pressure relief hole, the exhaust adjustment hole is arranged on the exhaust bolt, and the exhaust adjustment hole is arranged on the exhaust bolt. One end of the exhaust bolt is set in a conical shape, the exhaust bolt passes through the pressure relief hole and the conical end abuts against the inner wall of the pressure relief hole.

Beneficial effects of the present utility model: 1. The utility model provides a normally closed intake valve of an air compressor with simple structure, less leakage points and convenient operation. An emergency stop spring is arranged between the piston and the piston cap, which can effectively To prevent the phenomenon of oil injection when the air compressor stops suddenly, the internal pressure of the air compressor can be discharged from the pressure relief hole through the piston, piston cap and the hollow pipeline inside the sealing top, so as to achieve the purpose of pressure relief. In the process of pressing, a gap will be formed between the sealing top and the O-ring of the upper body cover, and the air supply of the intake valve can be realized through the gap, so as to ensure the oil circulation. Compared with the existing pressure relief and air supply structure, the utility model The effect of pressure relief and air supply is more significant, and the structure is simple and easy to operate.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the normally closed intake valve in the utility model.

Fig. 2 is a schematic cross-sectional structure diagram of the unloading state of the middle-entry normally-closed air valve of the utility model.

Fig. 3 is a schematic cross-sectional structure diagram of the intake state of the normally closed intake valve in the utility model.

Fig. 4 is a schematic cross-sectional structure diagram of the emergency stop state of the normally closed intake valve in the utility model.

Fig. 5 is a schematic diagram of the structure of the piston in the utility model.

The meanings of the symbols in the figure are as follows: 1- valve body; 2- upper cover body; 3- solenoid valve; 4- cavity; 5- pressure inlet hole; 6- pressure relief hole; Air intake hole; 41-seal top; 42-piston cap; 43-piston; 44-emergency stop spring; 45-return spring; 61-exhaust bolt; 431-upper sealing ring;

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

The utility model is described in detail below in conjunction with Fig. 1 to Fig. 5. A normally closed intake valve of an air compressor includes a valve body 1, and the valve body 1 is provided with a pressure inlet 5, a pressure relief hole 6 and a valve located at the valve body. The cavity 4 in the body, the pressure inlet hole 5 is connected with the gas pipeline interface, the valve body 1 is fixedly connected with the upper cover body 2 by bolts, the upper cover body 2 is provided with an air inlet hole 21, and its characteristic In that: the cavity 4 is provided with a piston 43, the open end of the cavity 4 is fixedly connected with a piston cap 42, the piston 43 is slidably arranged relative to the piston cap 42, and also includes a sealing top 41, and the sealing top 41 is socketed An emergency stop spring 44 is provided at the joint between the piston 43 and the sealing top 41 and the piston 43, and a return spring 45 is provided at the bottom of the piston 43 and the cavity 4, and one end of the return spring 45 is against the bottom of the cavity 4 and the other end is against the bottom of the cavity 4. The piston 43, the piston 43, the piston cap 42 and the internal pipeline of the sealing top 41 are all set to be hollow, and the sealing top 41 is movable relative to the piston 43 and the sealing top 41 is against the air inlet 21 in the upper cover body 2, The pressure inlet hole 5 communicates with the airtight space formed between the piston 43 and the piston cap 42, and also includes a solenoid valve 3 and several sealing rings. The solenoid valve 3 is connected to the outer surface of the valve body 1, and the solenoid valve 3 is located at the inlet Between the pressure hole 5 and the gas pipeline interface, the seal top 41, the piston 43 and the piston cap 42 are all provided with sealing rings, and the upper cover 21 is provided with an upper cover O-ring 7. Both the pressure inlet hole 5 and the pressure relief hole 6 are connected to the gas pipeline interface. When the gas pressure is discharged from the solenoid valve 3, the sealing top 41 and the upper body cover O-ring 7 are separated. , the sealing top 41 and the upper body cover O-ring 7 are arranged close to each other, and the piston 43 is provided with two grooves, and an upper sealing ring 431 and a lower sealing ring 432 are respectively installed in the grooves. The pressure relief hole 6 is set in a 'cross' shape, one of the holes of the pressure relief hole 6 communicates with the cavity 4, the hole opposite to it is sealed by bolts, the other hole is connected to the outside world, and the other hole opposite to it is sealed Setting, the valve body 1 is provided with an exhaust adjustment hole for adjusting the exhaust volume, the exhaust adjustment hole is connected to the pressure relief hole 6, and the exhaust adjustment hole is arranged in the exhaust bolt 61, and the exhaust bolt One end of 61 is set in a conical shape, the exhaust bolt 61 passes through the pressure relief hole 6 and one end of the conical shape abuts against the inner wall of the pressure relief hole 6 .

Based on the above structure, when the intake valve is in a loaded state, the solenoid valve 3 is energized, and the compressed gas is injected into the pressure hole 5 through the air pipe joint. When the pressure gradually increases, because the pressure hole is connected to the piston 43 and the piston In the closed space between the caps 42, the pressure in the closed space increases gradually, and the compression piston 43 moves downward. When the piston 43 moves to the bottom of the cavity 4, the pressure relief hole 6 is located between the upper sealing ring 431 and the lower sealing ring 431 on the piston 43. Between the sealing rings 432, the piston 43 disconnects the pressure relief hole 6 and the hollow pipeline inside the piston 43, the piston cap 42 and the sealing top 41. Since the air compressor is in the working state, suction is generated inside the air compressor host, and the suction drives The sealing top 41 moves downward, the gap between the sealing top 41 and the air intake hole 21 on the upper cover body 2 is in an open state, and the air intake valve is in an air intake state.

Based on the above structure, when the intake valve is in the unloaded state, the solenoid valve 3 is powered off, the compressed gas in the closed space between the piston 43 and the piston cap 42 is discharged through the solenoid valve 3, and the return spring at the bottom of the cavity 4 45. Push the piston 43 to move upwards. When the sealing ring 432 under the piston 43 passes through the pressure relief hole 6, the gas pressure inside the compressor and in the pipeline passes through the pressure relief hole 6 and passes through the middle of the piston 43, the piston cap 42 and the sealing top 41. The empty pipeline is discharged. Due to the suction force inside the compressor, the suction force is smaller than the elastic force of the return spring 45. The return spring 45 drives the piston 43 and the sealing top 41 to move upward. When the piston 43 moves to the position close to the piston cap 42, due to the compressor The internal suction force is greater than the elastic force of the emergency stop spring 44. At this time, a gap is formed between the sealing top 41 and the upper cover body O-ring 7. The gap makes the inside of the air compressor communicate with the outside world, and realizes a small amount of air intake of the compressor through the gap, thereby Ensure the oil circulation inside the air compressor.

Based on the above structure, when the air compressor needs emergency braking, the solenoid valve 3 is powered off, the compressed gas in the closed space between the piston 43 and the piston cap 42 is discharged through the solenoid valve 3, and the reset button located at the bottom of the cavity 4 The spring 45 pushes the piston 43 to move upward. When the lower sealing ring 432 on the piston 43 passes through the pressure relief hole 6, the gas pressure inside the compressor and in the pipeline passes through the pressure relief hole 6 through the piston 43, the piston cap 42 and the sealing top 41. The internal hollow pipeline is discharged. Since there is no suction inside the compressor, the return spring 45 drives the piston 43 and the sealing top 41 to move upward, and the emergency stop spring 44 further drives the sealing top 41 to move upward, so that the sealing top 41 is against the upper cover. O-ring 7, thereby effectively preventing the compressor from spraying oil.

The above is only the preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and modifications can also be made. These improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims (4)

1. a kind of normally closed intake valve of air compressor, includes valve body, entering pressure hole, relief hole and position is provided on the valve body Cavity in valve body is connected with gas pipeline interface in entering pressure hole, upper cover body has been bolted to connection on the valve body, It is provided with air admission hole in the upper cover body, it is characterised in that：Piston is provided in the cavity, cavity hatch end is fixedly connected with Piston cap, piston are slidably arranged relative to piston cap, further include having sealing to push up, and the sealing top cover is connected to piston, sealing top The socket place of piston is provided with emergency stop spring, the bottom of piston and cavity is provided with resetting spring, and one end of resetting spring is supported It is butted on piston in the cavity bottom other end, piston, piston cap and sealing top internal duct are disposed as hollow, the sealing top Relative to the movable setting of piston and the air admission hole being resisted against in upper cover body is sealed, the entering pressure hole is communicated in piston and piston cap Between the confined space that is formed, further include thering is solenoid valve and several sealing rings, the solenoid valve to be connected to valve outer surface, electricity Magnet valve is both provided with sealing ring, institute between entering pressure hole and gas pipeline interface on the sealing top, piston and piston cap It states and is provided with upper cover body O-ring on the air admission hole in upper cover body, the entering pressure hole is communicated in gas pipeline interface with relief hole, It is separately positioned between sealing top and upper body lid O-ring when gas pressure intensity is discharged from solenoid valve, it is close when emergency shutdown It binds and is close to be arranged between the lid O-ring of upper body.

2. the normally closed intake valve of a kind of air compressor according to claim 1, it is characterised in that：It is provided on the piston Two grooves are respectively arranged with sealing ring and lower seal in the groove.

3. the normally closed intake valve of a kind of air compressor according to claim 1, it is characterised in that：The relief hole is set as ' ten ' shape, one of described relief hole hole are connected to cavity, hole corresponding thereto carried out by bolt it is closed, another Hole is communicated in the external world, another hole sealed set corresponding thereto.

4. the normally closed intake valve of a kind of air compressor according to claim 1, it is characterised in that：It is provided on the valve body It is vented adjustment hole for adjusting capacity, exhaust adjustment hole is communicated in relief hole, exhaust spiral shell is set in the exhaust adjustment hole One end of bolt, the bleeder screw is set as coniform, and bleeder screw passes through relief hole and coniform one end is butted on relief hole Inner wall.