CN220540184U - Power limiting valve, air suspension system and vehicle - Google Patents

Abstract

The utility model relates to a power limiting valve, an air suspension system and a vehicle. The power limiting valve includes a cover, an elastic member, a valve core, a shell, a sealing valve plate, a first guide member, a second guide member and a base. The base is provided with an installation cavity, the bottom end of the housing is fixed in the installation cavity, the cover is fixed on the top of the housing, and the valve core is provided in the housing and connected with the housing. The inner wall of the valve body has a clearance fit, and the middle part of the sealing valve piece abuts against the bottom surface of the valve core and blocks the bottom opening of the housing. In the power limiting valve of the present utility model, the double guide design of the first guide part and the second guide part plays a very good guiding role in the movement of the valve core. The movement of the valve core is stable and can ensure the linear movement of the valve core along its axial direction. .

Description

Power limiting valves, air suspension systems and vehicles

Technical field

The utility model belongs to the field of valve technology and relates to a power limiting valve, an air suspension system and a vehicle.

Background technique

Power limiting valves are often used in automotive air suspension systems to protect the air compressor in the air suspension system and limit the overall air pressure of the air suspension system.

An existing power limiting valve includes a cover, a spring, a valve core, a shell, a sealing valve piece and a base. The cover is riveted on the top of the shell to form a cavity inside the cover and the shell. The valve core is slidably arranged. In the cavity, the spring is supported between the valve core and the cover. The base is provided with an air inlet connected to the air path between the air compressor and the air equipment (such as an air spring), and the base is also provided with a pressure relief hole. When the pressure in the gas line is less than the opening pressure of the power limiting valve, the valve core pushes the sealing valve piece to block the pressure relief hole under the force of the spring, so that the pressure relief hole is insulated from the air inlet. When the pressure in the gas line is greater than the opening pressure of the power limiting valve, the valve core moves toward the sealing direction, causing the sealing valve plate to open the pressure relief hole, allowing the pressure relief hole to communicate with the air inlet for pressure relief.

However, the existing power limiting valve realizes movement guidance through the bottom periphery of the valve core and the inner wall of the guide hole at the bottom of the housing. The valve core is only guided in one place, and the movement of the valve core is unstable, and the movement of the valve core may Not linear.

Contents of the invention

The technical problem to be solved by this utility model is: for the existing power limiting valve, movement guidance is realized through the bottom periphery of the valve core and the inner wall of the guide hole at the bottom of the housing. The valve core is only guided in one place, and the movement of the valve core is To solve the problem of instability, a power limiting valve, air suspension system and vehicle are provided.

In order to solve the above technical problems, on the one hand, the utility model provides a power limiting valve, which includes a cover, an elastic member, a valve core, a shell, a sealing valve plate, a first guide member, a second guide member and a base. An installation cavity is provided on the base, the bottom end of the housing is fixed in the installation cavity, the cover is fixed on the top of the housing, the valve core is arranged in the housing and is in contact with the inner wall of the housing. Clearance fit, the middle part of the sealing valve piece abuts the bottom surface of the valve core and blocks the bottom opening of the housing; the inner hole of the housing includes a first guide hole and a connection between the first guide hole and the first guide hole. The second guide hole at the bottom end, the first guide member and the second guide member are arranged on the outer periphery of the valve core, the first guide member is in sliding contact with the hole wall of the first guide hole, and the second guide member is in sliding contact with the wall of the first guide hole. The two guide members are in sliding contact with the hole wall of the second guide hole; the base is provided with a pressure relief hole and an air inlet channel, and the elastic force of the elastic member acting on the valve core causes the valve core to have a direction The tendency of the sealing valve plate to move;

When the air pressure in the air inlet passage is less than the opening pressure of the power limiting valve, the sealing valve plate blocks the inner end opening of the pressure relief hole, so that the air inlet passage is in contact with the pressure relief hole. Isolation; when the air pressure in the air inlet channel reaches the opening pressure of the power limiting valve, the sealing valve piece opens the inner end opening of the pressure relief hole, so that the air inlet channel and the pressure relief hole Connected.

Optionally, the first guide hole and the second guide hole are round holes, and the inner diameter of the first guide hole is greater than the inner diameter of the second guide hole;

The valve core has a first part accommodated in the first guide hole and a second part accommodated in the second guide hole, and the first guide member is provided on the outer periphery of the first part, so The second guide member is provided on the outer periphery of the second part.

Optionally, the first guide member and the second guide member are annular, a first annular groove is provided on the outer circumference of the first part, a second annular groove is provided on the outer circumference of the second part, and the first annular groove is provided on the outer circumference of the second part. A guide member is received in the first annular groove, and the second guide member is received in the second annular groove.

Optionally, the first guide member and the second guide member are O-rings.

Optionally, the elastic member is supported between the valve core and the cover.

Optionally, the inner hole of the valve core includes a large-diameter hole and a small-diameter hole connected to the bottom end of the large-diameter hole, and the connection between the large-diameter hole and the small-diameter hole forms a first step surface;

The elastic member includes a first spring and a second spring. The first spring is supported between the first step surface and the cover. The second spring is located inside the first spring and supports Between the bottom surface of the small diameter hole and the cover.

Optionally, the cover is provided with an annular limiting protrusion protruding toward the valve core, and the top end of the first spring is limited inside the limiting protrusion.

Optionally, the cover includes a bottom plate and a side tube connected at an edge of the bottom plate, and the side tube is interference-pressed and welded to the outside of the top of the housing.

Optionally, the cover is provided with a ventilation hole for communicating the inner hole of the housing with the outside world.

Optionally, the installation cavity includes a large-diameter cavity and a small-diameter cavity connected to the bottom end of the large-diameter cavity. The connection between the large-diameter cavity and the small-diameter cavity forms a second step surface, and is provided on the outer periphery of the housing. There is a radial boss, the radial boss is interference-pressed in the large diameter cavity, and the bottom surface of the radial boss overlaps the second step surface.

Optionally, the edge portion of the sealing valve plate is pressed between the bottom surface of the housing and the bottom surface of the installation cavity.

Optionally, the bottom surface of the housing is provided with a protrusion protruding toward the bottom surface of the installation cavity, and the protrusion is pressed against an edge portion of the sealing valve plate.

Optionally, the pressure relief hole is provided at the middle position of the bottom of the base and extends along the axial direction of the base, and the outer end of the pressure relief hole is connected to the outside world;

The air inlet channel includes an air inlet hole and an air inlet cavity. The air inlet cavity is arranged around the pressure relief hole. The air inlet hole extends along the radial direction of the base. The inner end of the air inlet hole is in contact with the pressure relief hole. The air inlet chamber is connected, and the outer end of the air inlet hole is used to connect the air path between the air compressor and the air equipment.

In the power limiting valve of the embodiment of the present invention, the first guide member is in sliding contact with the hole wall of the first guide hole, the second guide member is in sliding contact with the hole wall of the second guide hole, and the first guide member and the second guide member are in sliding contact. The double guide design plays a very good guiding role in the movement of the valve core. The movement of the valve core is stable and can ensure the linear movement of the valve core along its axis. The valve core is in clearance fit with the inner wall of the shell to avoid contact between the valve core and the shell. The first guide part and the second guide part are in sliding contact with the inner wall of the shell. Compared with the direct contact between the valve core and the shell, the sliding friction is smaller.

On the other hand, embodiments of the present invention also provide an air suspension system, including an air compressor, an air spring and the above-mentioned power limiting valve. The air compressor and the air spring are connected through an air path, and the inlet The outer end of the air channel is connected to the air path, and the outer end of the pressure relief hole is connected to the outside world.

On the other hand, embodiments of the present invention also provide a vehicle, including the above-mentioned air suspension system.

Description of drawings

Figure 1 is a top view of a power limiting valve provided by an embodiment of the present invention;

Figure 2 is a cross-sectional view along the A-A direction in Figure 1;

Figure 3 is a schematic diagram of a cover of a power limiting valve provided by an embodiment of the present invention;

Figure 4 is a schematic diagram of the housing of a power limiting valve provided by an embodiment of the present invention;

Figure 5 is a schematic diagram of the valve core of the power limiting valve provided by an embodiment of the present invention;

Figure 6 is a schematic diagram of the base of a power limiting valve provided by an embodiment of the present invention.

The reference symbols in this manual are as follows:

1. Cover; 11. Limiting protrusion; 12. Bottom plate; 13. Side cylinder; 14. Ventilation hole; 2. Valve core; 21. First part; 211. First ring groove; 22. Second part; 221 , second ring groove; 23. inner hole of the valve core; 231. large diameter hole; 232. small diameter hole; 233. first step surface; 3. shell; 31. inner hole of the shell; 311. first guide hole; 312. Second guide hole; 32. Radial boss; 33. Protrusion; 4. Sealing valve plate; 5. First guide piece; 6. Second guide piece; 7. Base; 71. Installation cavity; 711. Large diameter cavity; 712, small diameter cavity; 713, second step surface; 72, pressure relief hole; 73, air inlet channel; 731, air inlet hole; 732, air inlet cavity; 8, first spring; 9, second spring.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clear, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Referring to Figures 1 to 5, a power limiting valve provided by an embodiment of the present invention includes a cover 1, an elastic member, a valve core 2, a shell 3, a sealing valve plate 4, a first guide 5, and a second guide 6 And the base 7, the base 7 is provided with an installation cavity 71, the bottom end of the housing 3 is fixed in the installation cavity 71, the cover 1 is fixed on the top of the housing 3, the valve core 2 It is arranged in the housing 3 and is in clearance fit with the inner wall of the housing 3. The middle part of the sealing valve piece 4 abuts the bottom surface of the valve core 2 and blocks the bottom opening of the housing 3; The inner hole 31 of the housing 3 includes a first guide hole 311 and a second guide hole 312 connected to the bottom end of the first guide hole 311. The first guide member 5 and the second guide member 6 are arranged on the valve core 2 On the outer circumference, the first guide member 5 is in sliding contact with the hole wall of the first guide hole 311, and the second guide member 6 is in sliding contact with the hole wall of the second guide hole 312; the base 7 A pressure relief hole 72 and an air inlet passage 73 are provided on the valve body. The elastic force of the elastic member acting on the valve core 2 causes the valve core 2 to have a tendency to move toward the sealing valve plate 4 . That is, the elastic member begins to push the valve core 2 toward the sealing valve plate 4 .

When the air pressure in the air inlet passage 73 is less than the opening pressure of the power limiting valve, the sealing valve plate 4 blocks the inner end opening of the pressure relief hole 72 so that the air inlet passage 73 is connected to the opening pressure of the power limiting valve. The pressure relief hole 72 is isolated; when the air pressure in the air inlet passage 73 reaches the opening pressure of the power limiting valve, the sealing valve piece 4 opens the inner end of the pressure relief hole 72 so that the inlet The air channel 73 is connected with the pressure relief hole 72 to realize pressure relief.

In the power limiting valve of the embodiment of the present invention, the first guide member 5 is in sliding contact with the hole wall of the first guide hole 311, the second guide member 6 is in sliding contact with the hole wall of the second guide hole 312, and the first guide member 5 is in sliding contact with the hole wall of the second guide hole 312. The double guide design of the second guide member 6 plays a very good guiding role in the movement of the valve core 2. The movement of the valve core 2 is stable and can ensure the linear movement of the valve core 2 along its axial direction. The valve core 2 is in clearance fit with the inner wall of the shell 3 to avoid contact between the valve core 2 and the shell 3. The first guide part 5 and the second guide part 6 are in sliding contact with the inner wall of the shell 3, and are in direct contact with the valve core 2 and the shell 3. , the sliding friction is smaller.

In one embodiment, the housing 3 has a rotary structure, the first guide hole 311 and the second guide hole 312 are round holes, and the inner diameter of the first guide hole 311 is larger than the inner diameter of the second guide hole 312; The valve core 2 has a first part 21 accommodated in the first guide hole 311 and a second part 22 accommodated in the second guide hole 312. The first guide member 5 is disposed on the first guide hole 311. On the outer circumference of the part 21 , the second guide member 6 is provided on the outer circumference of the second part 22 .

In one embodiment, the first guide member 5 and the second guide member 6 are annular, the first part 21 is provided with a first annular groove 211 on its outer circumference, and the second part 22 is provided with a third annular groove 211 on its outer circumference. Two annular grooves 221, the first guide member 5 is received in the first annular groove 211, and the second guide member 6 is received in the second annular groove 221. The first annular groove 211 can limit the position of the first guide 5 on the valve core 2 and prevent the first guide 5 from moving on the valve core 2 . The second annular groove 221 can limit the position of the second guide 6 on the valve core 2 position to prevent the second guide member 6 from moving on the valve core 2.

In one embodiment, the first guide member 5 and the second guide member 6 are O-rings. The inner wall surface of the housing 3 has a high smoothness. The inner wall surface of the housing 3 is in sliding contact with the two O-rings. The inner wall surface of the housing 3 has a clearance fit with the valve core 2 . The contact between the O-ring and the inner wall surface of the housing 3 is close to line contact, and the friction resistance is small.

Of course, in other embodiments, sealing rings of other cross-sectional shapes may also be used, such as square, triangular, elliptical, semicircular, etc.

In one embodiment, the elastic member is supported between the valve core 2 and the cover 1 .

In one embodiment, the inner hole 23 of the valve core 2 includes a large-diameter hole 231 and a small-diameter hole 232 connected to the bottom end of the large-diameter hole 231. The connection between the large-diameter hole 231 and the small-diameter hole 232 forms a First step surface 233; the elastic member includes a first spring 8 and a second spring 9. The first spring 8 is supported between the first step surface 233 and the cover 1. The second spring 9 is located inside the first spring 8 and is supported between the bottom surface of the small diameter hole 232 and the cover 1 .

The first spring 8 and the second spring 9 are cylindrical coil springs.

Using double springs to push the valve core 2 makes the compression force endured by a single spring smaller. This can reduce the compression force loss of the spring after long-term use of the power limiting valve, and effectively ensure the accuracy and service life of the power limiting valve.

The valve core 2 can be made of plastic material. The design of the first spring 8 and the second spring 9 being one high and one low (the second spring 9 is higher than the first spring 8) can effectively reduce the glue and weight of the plastic valve core 2. It is beneficial to realize the structural simplification and miniaturization of the power limiting valve.

In one embodiment, the cover 1 is provided with an annular limiting protrusion 11 protruding toward the valve core 2 , and the top end of the first spring 8 is limited to the inside of the limiting protrusion 11 . The limiting protrusion 11 plays a limiting role on the top end of the first spring 8 .

In one embodiment, the cover 1 includes a bottom plate 12 and a side tube 13 connected to the edge of the bottom plate 12 . The side tube 13 is interference-pressed and welded (for example, laser welded) to the shell 3 outside of the top.

In one embodiment, the cover 1 is provided with a ventilation hole 14 for connecting the inner hole 31 of the housing 3 with the outside world. The ventilation hole 14 is located in the middle of the bottom plate 12 . The limiting protrusion 11 surrounds the ventilation hole 14 . The cover 1 has a rotary structure, and the vent hole 14 connects the inside of the power limiting valve to the outside atmosphere, preventing an air cavity from forming inside the power limiting valve and affecting the opening of the inside of the power limiting valve. In one embodiment, the installation cavity 71 includes a large-diameter cavity 711 and a small-diameter cavity 712 connected to the bottom end of the large-diameter cavity 711 . The connection between the large-diameter cavity 711 and the small-diameter cavity 712 forms a second step surface. 713. A radial boss 32 is provided on the outer circumference of the housing 3. The radial boss 32 is interference-pressed and installed in the large diameter cavity 711, and the bottom surface of the radial boss 32 overlaps on the second step surface 713 . The radial boss 32 is used for interference pressing and caulking of the base 7 to ensure the overall strength and airtightness of the power limiting valve.

In one embodiment, the edge portion of the sealing valve plate 4 is pressed between the bottom surface of the housing 3 and the bottom surface of the installation cavity 71 .

In one embodiment, the bottom surface of the housing 3 is provided with a protrusion 33 protruding toward the bottom surface of the installation cavity 71 , and the protrusion 33 is pressed against the edge portion of the sealing valve plate 4 . The protrusions 33 are annular, and the number of the protrusions 33 can be one or more. The arrangement of the protrusions 33 enables the housing 3 to be pressed more tightly against the sealing valve plate 4 after being pressed onto the base 7, thus achieving a very excellent sealing effect.

In one embodiment, the pressure relief hole 72 is disposed in the middle of the bottom of the base 7 and extends along the axial direction of the base 7 . The outer end of the pressure relief hole 72 is connected to the outside world; the air inlet channel 73 includes an air inlet hole 731 and an air inlet cavity 732. The air inlet cavity 732 is arranged around the pressure relief hole 72. The air inlet hole 731 extends along the radial direction of the base 7. The air inlet hole 731 is The inner end is connected to the air inlet chamber 732, and the outer end of the air inlet hole 732 is used to connect the air path between the air compressor and the air equipment.

In one embodiment, the material of the sealing valve plate 4 is neoprene with nylon thread added, which has high strength. The edge portion of the sealing valve plate 4 is sealed by the interference compression between the bottom of the housing 3 and the base 7 .

The working principle of the power limiting valve in the above embodiment is as follows:

This power limiting valve is mainly used in the air suspension system to protect and relieve pressure of the air compressor.

The compressed gas entering the base 7 through the air inlet channel 73 forms a thrust force acting on the bottom surface of the sealing valve plate 4. When the pressure of the compressed gas in the base 7 is less than the opening pressure of the power limiting valve, the thrust of the gas on the sealing valve plate 4 is less than The elastic force (resultant force) of the first spring 8 and the first spring 9 seals the contact between the middle part of the valve plate 4 and the base 7, thereby blocking the inner end opening of the pressure relief hole 72, and the pressure relief hole 72 is isolated from the air inlet channel 73. At this time, the power limiting valve remains in the closed state (as shown in Figure 2). When the compressed gas pressure in the base 7 increases to the opening pressure of the power limiting valve, the compressed gas in the base 7 will push the sealing valve plate 4 upward, and the middle deformation of the sealing valve plate 4 will push up the valve core 2, overcoming the first The elastic force of the spring 8 and the first spring 9 pushes away the contact portion between the middle part of the sealing valve plate 4 and the base 7, thereby opening the inner end opening of the pressure relief hole 72, and the pressure relief hole 72 is connected with the air inlet channel 73, thereby realizing When the power limiting valve is opened, the compressed gas in the base 7 will quickly flow out from the pressure relief hole 72 in the middle of the base 7 , effectively limiting the air pressure in the base 7 to continue to increase. The pressure relief of the power limiting valve causes the air pressure in the base 7 to continuously decrease. The thrust of the first spring 8 and the first spring 9 on the valve core 2 will push the valve core 2 downward and push the sealing valve plate 4 until the sealing valve plate 4 is sealed. The inner end opening of the pressure relief hole 72 is closed, and the pressure relief hole 72 and the air intake passage 73 are isolated again. At this time, the power limiting valve returns to the closed state. On the other hand, an embodiment of the present invention also provides an air suspension system, including an air compressor, an air spring and the power limiting valve of the above embodiment. The air compressor and the air spring are connected through an air path, so The outer end of the air inlet channel 73 is connected to the air path, and the outer end of the pressure relief hole 72 is connected to the outside world.

In other embodiments, one of the first spring 8 and the second spring 9 can also be eliminated and a single spring structure is adopted.

In other embodiments, the elastic member can also be an elastic rubber tube.

In other embodiments, the elastic member may also be an elastic piece.

On the other hand, an embodiment of the present invention also provides a vehicle, including the air suspension system of the above embodiment.

The above are only preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included in the present utility model. within the scope of protection.

Claims (15)

1. A power limiting valve, characterized in that it includes a cover, an elastic member, a valve core, a shell, a sealing valve plate, a first guide member, a second guide member and a base. The base is provided with an installation cavity, so The bottom end of the housing is fixed in the installation cavity, the cover is fixed on the top of the housing, the valve core is arranged in the housing and fits with the inner wall of the housing, and the sealing valve piece The middle part of the valve core abuts the bottom surface of the valve core and blocks the bottom opening of the housing; the inner hole of the housing includes a first guide hole and a second guide hole connected to the bottom end of the first guide hole, so The first guide member and the second guide member are arranged on the outer periphery of the valve core, the first guide member is in sliding contact with the hole wall of the first guide hole, and the second guide member is in sliding contact with the second guide hole. The hole walls of the guide hole are in sliding contact; the base is provided with a pressure relief hole and an air inlet channel, and the elastic force of the elastic member acting on the valve core causes the valve core to have a tendency to move toward the sealing valve plate ; When the air pressure in the air inlet passage is less than the opening pressure of the power limiting valve, the sealing valve plate blocks the inner end opening of the pressure relief hole, so that the air inlet passage is in contact with the pressure relief hole. Isolation; when the air pressure in the air inlet channel reaches the opening pressure of the power limiting valve, the sealing valve piece opens the inner end opening of the pressure relief hole, so that the air inlet channel and the pressure relief hole Connected. 2. The power limiting valve according to claim 1, wherein the first guide hole and the second guide hole are round holes, and the inner diameter of the first guide hole is greater than the inner diameter of the second guide hole; The valve core has a first part accommodated in the first guide hole and a second part accommodated in the second guide hole, and the first guide member is provided on the outer periphery of the first part, so The second guide member is provided on the outer periphery of the second part. 3. The power limiting valve according to claim 2, wherein the first guide member and the second guide member are annular, a first annular groove is provided on the outer circumference of the first part, and the second part is A second annular groove is provided on the outer circumference, the first guide member is accommodated in the first annular groove, and the second guide member is accommodated in the second annular groove. 4. The power limiting valve according to claim 3, wherein the first guide member and the second guide member are O-rings. 5. The power limiting valve according to claim 1, wherein the elastic member is supported between the valve core and the cover. 6. The power limiting valve according to claim 5, wherein the inner hole of the valve core includes a large-diameter hole and a small-diameter hole connected to the bottom end of the large-diameter hole, and the large-diameter hole and the small-diameter hole The connection forms the first step surface; The elastic member includes a first spring and a second spring. The first spring is supported between the first step surface and the cover. The second spring is located inside the first spring and supports Between the bottom surface of the small diameter hole and the cover. 7. The power limiting valve according to claim 6, wherein the cover is provided with an annular limiting protrusion protruding toward the valve core, and the top end of the first spring is limited to the limiting protrusion. The inner side of the bulge. 8. The power limiting valve according to claim 1, wherein the cover includes a bottom plate and a side tube connected to the edge of the bottom plate, and the side tube is interference-pressed and welded to the outer shell. outside of the top. 9. The power limiting valve according to claim 1, wherein the cover is provided with a vent hole for connecting the inner hole of the housing with the outside world. 10. The power limiting valve according to claim 1, wherein the installation cavity includes a large diameter cavity and a small diameter cavity connected to the bottom end of the large diameter cavity, and the connection between the large diameter cavity and the small diameter cavity A second step surface is formed, and a radial boss is provided on the outer periphery of the housing. The radial boss is interference-pressed and installed in the large-diameter cavity, and the bottom surface of the radial boss overlaps the Describe the second step surface. 11. The power limiting valve according to claim 1, wherein the edge portion of the sealing valve plate is pressed between the bottom surface of the housing and the bottom surface of the installation cavity. 12. The power limiting valve according to claim 11, wherein the bottom surface of the housing is provided with a protrusion protruding toward the bottom surface of the installation cavity, and the protrusion is pressed against the sealing valve plate. on the edge. 13. The power limiting valve according to claim 1, characterized in that the pressure relief hole is provided at a middle position of the bottom of the base and extends along the axial direction of the base, and the outer end of the pressure relief hole is connected to outside world; The air inlet channel includes an air inlet hole and an air inlet cavity. The air inlet cavity is arranged around the pressure relief hole. The air inlet hole extends along the radial direction of the base. The inner end of the air inlet hole is in contact with the pressure relief hole. The air inlet chamber is connected, and the outer end of the air inlet hole is used to connect the air path between the air compressor and the air equipment. 14. An air suspension system, characterized in that it includes an air compressor, an air spring and the power limiting valve according to any one of claims 1 to 13, and the air compressor and the air spring are connected through a gas line , the outer end of the air inlet channel is connected to the air path, and the outer end of the pressure relief hole is connected to the outside world. 15. A vehicle, characterized by comprising the air suspension system of claim 14.