CN216044692U

CN216044692U - Piston for overflow valve and overflow valve

Info

Publication number: CN216044692U
Application number: CN202121891187.0U
Authority: CN
Inventors: 张玄; 徐步都; 蔡君国; 祝晓宇; 林衍飞
Original assignee: Zhejiang Ruili Air Compressor Equipment Co ltd
Current assignee: Zhejiang Ruili Air Compressor Equipment Co ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2022-03-15
Anticipated expiration: 2031-08-12

Abstract

The utility model discloses a piston for an overflow valve, wherein a spring protection structure is formed on the periphery of an upper boss of a piston main body, after a spring is sleeved on the upper boss, the spring is limited in the circumferential direction and the radial direction by the spring protection structure outside the spring, and under the impact deviating from the center of the piston, the spring is protected by the spring protection structure, so that the deformation space is reduced, the deformation of the spring is further reduced, the unbalance of the spring pressure of the spring on the piston is reduced, and meanwhile, the irregular transition metal friction between the piston and the wall of the piston cavity is also reduced; furthermore, the spring protection structure is a cylinder integrally formed with the piston main body, and the spring is protected more comprehensively by the structure, so that the deformation space of the spring is further reduced, and the spring is convenient to process and use; further, an overflow valve using the piston is also disclosed.

Description

Piston for overflow valve and overflow valve

Technical Field

The utility model relates to the technical field of overflow valves, in particular to a piston and an overflow valve for an overflow valve of a starting system with high precision and severe use condition, such as a pneumatic system of vehicles such as high-speed rails, subways, motor cars, light rails, trains and the like.

Background

In a pneumatic system, a valve is used that has a nominal pressure start and a minimum pressure shut off function, i.e., the valve opens when the input pressure is greater than the nominal value and closes when the input pressure is less than the nominal value. The existing air valve with the function comprises a gate valve, an overflow valve and the like, the internal structure of the product is divided into a diaphragm structure and a piston structure, and the performance index of the piston is stable, for example, Chinese patent document CN203395308 discloses an overflow valve which comprises a main valve body, wherein a piston is embedded in the main valve body, the piston is of a disc-shaped structure, a spring is arranged at the upper part of the piston, a valve is arranged at the lower part of the piston, the valve comprises a valve opening, and the main valve body comprises an input port and an output port; . In the above structure or the existing relief valve structure, the position of the input port is generally located at the position of the piston deviating from the center of the piston, the piston with the disc-shaped structure and other structures do not form a protection structure of the spring, and when high-pressure gas impacts the piston through the input port, particularly after multiple impact processes, the impact deviating from the center of the piston causes the spring to deform, so that the elastic pressure of the spring to the piston is unbalanced, and even metal friction is formed between the piston and a piston cavity.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a piston for an overflow valve, which comprises a piston main body, wherein the piston main body is provided with a sealing ring along the circumferential direction of the piston main body and a valve port upper sealing element below the piston main body, and a spring protection structure is formed on the periphery of an upper boss of the piston main body.

The utility model also provides an overflow valve which comprises a main valve body, wherein a piston cavity is formed in the main valve body, the piston is arranged in the piston cavity, and a pressure adjusting structure is arranged above the piston; the main valve body is provided with an air inlet channel, a valve port and an air outlet channel; the air inlet channel is communicated with the piston cavity, the valve port is sealed by a valve port upper sealing element under the action of the pressure adjusting structure, and the valve port is communicated with the air outlet channel; when the gas pressure of the gas inlet channel overcomes the pressure of the pressure adjusting structure, the gas pushes the piston, and then enters the gas outlet channel through the valve port to be discharged.

Further, the spring protection structure is attached to the side wall of the piston cavity or an auxiliary structure arranged on the side wall of the piston cavity, and slides under the pushing of the pressure adjusting structure or the gas pressure.

Further, the side wall of the piston cavity forms an exhaust passage.

Furthermore, a filter element is arranged in the exhaust passage.

Further, an exhaust membrane is installed at the tail end of the exhaust channel.

Further, the exhaust port at the tail end of the exhaust passage is enlarged, and the exhaust diaphragm covers the exhaust port.

Furthermore, a one-way valve structure is arranged in the air outlet channel.

Furthermore, a limiting structure of the one-way valve structure is arranged in the air outlet channel.

Further, the pressure adjusting structure comprises a spring, a spring pressing plate and an adjusting bolt; the check valve structure comprises a check valve spring, a spring seat, a valve plate and a lower valve port sealing element arranged on the valve plate.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

(1) according to the piston for the overflow valve, the spring protection structure is formed on the periphery of the upper boss of the piston main body, after the spring is sleeved on the upper boss, the spring is limited in the circumferential direction and the radial direction by the spring protection structure outside the spring, and under the impact deviating from the center of the piston, the spring is protected by the spring protection structure, so that the deformation space is reduced, the deformation of the spring is further reduced, the unbalance phenomenon of the spring pressure of the spring on the piston is reduced, and meanwhile, the irregular metal friction in transition between the piston and the wall of the piston cavity is also reduced; further, the spring protection structure is a cylinder integrally formed with the piston main body, the spring is protected more comprehensively by the structure, the space of deformation of the spring is further reduced, and the spring protection structure is convenient to process and use.

(2) According to the overflow valve, the spring protection structure is arranged, after the advantages are achieved, the spring protection structure is attached to the side wall of the piston cavity or an auxiliary structure arranged on the side wall of the piston cavity and slides under the pushing of the pressure adjusting structure or the gas pressure, the regular movement of the spring is guaranteed, the deformation space of the spring is reduced, and meanwhile, the overflow check valve is stable in operation and long in service life due to the structure.

(3) According to the overflow valve, the exhaust channel is arranged, so that the pressure of a piston cavity above the piston is kept consistent or close to the atmospheric pressure to the maximum extent in the movement process of the piston; furthermore, a filter element is arranged in the exhaust passage to filter impurities in the air and reduce air noise; furthermore, an exhaust membrane is arranged at the tail end of the exhaust channel, so that the air suction and exhaust of the exhaust channel are mild, and the influence on other structures is avoided; further, the exhaust port at the tail end of the exhaust channel is enlarged, and the exhaust diaphragm covers the exhaust port, so that noise reduction is further realized, particularly in the exhaust process.

(4) According to the overflow valve, the exhaust channel is internally provided with the one-way valve structure, and the air outlet channel can only realize a single air outlet function and cannot form an air inlet phenomenon by arranging the one-way valve structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to derive other drawings without creative efforts.

FIG. 1 is a schematic view of the construction of a piston for a spill valve of the present invention;

FIG. 2 is a schematic diagram of the relief valve of the present invention;

the reference numbers in the figures denote: 1-a piston body; 2-sealing ring; 3-valve port upper sealing element; 4-a piston cavity; 5, covering the upper cover; 6-valve body; 7-an intake passage; 8 valve ports; 9-an air outlet channel; 10-an auxiliary structure; 11-upper boss; 12-a spring protection structure; 13-an exhaust channel; 14-a filter element; 15-an exhaust membrane; 16-diaphragm bolts; 17-a limit structure; 21-a one-way valve spring; 19-spring pressure plate; 20-adjusting the bolt; 18-a spring; 22-spring seats; 23-valve plate; 24-lower port seal.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. The embodiments in the present invention, other embodiments obtained by persons skilled in the art without any inventive work, belong to the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, the present embodiment discloses a piston for a relief valve, which includes a piston main body 1, wherein the shape and structure of the piston main body 1 are not particularly limited, and an existing piston for a relief valve can be selected; a seal ring groove is formed in the circumferential direction of the piston main body 1, a seal ring 2 is further installed in the seal ring groove, the seal ring 2 is variously selected, in the embodiment, the seal ring 2 is a K-shaped seal ring, a seal groove is formed below the piston main body 1, an upper valve port seal 3 is installed in the seal groove, the upper valve port seal 3 is preferably made of rubber materials, a keel can be embedded in the upper valve port seal 3, or a rigid member is arranged outside the upper valve port seal; an upper boss 11 is arranged below the piston main body 1, a spring protection structure 12 is formed around the upper boss 11, the structure and the shape of the spring protection structure 12 are not particularly limited, preferably, the spring protection structure 12 is a cylindrical structure, and of course, similar structures and other structures for protecting the spring can be selected. In use, the spring is sleeved on the upper boss 11 and located between the upper boss 11 and the spring protection structure 12, and preferably, the outer diameter of the spring is equal to or close to the inner diameter or the minimum inner diameter of the spring protection structure 12.

Example 2

As shown in fig. 2, the present embodiment discloses a relief valve including the piston according to embodiment 1. Specifically, the overflow valve includes a main valve body 6, and the main valve body 6 is not particularly limited in structure, may be integrally formed, and may be separated, for example, including an upper cover 5 and a valve body 6 which are installed together; a piston cavity 4 is formed in the main valve body 6, and the piston cavity 4 has various structures, preferably cylindrical, more preferably multi-section cylindrical, and forms a stepped structure, so that the strength is increased, and the supplement and the limit are realized; the piston of embodiment 1 is installed in the piston cavity 4, and a pressure adjusting structure is arranged on the piston, and is used for adjusting and controlling the bearing pressure of the piston so as to adapt to different working conditions according to the actual gas pressure, and the pressure adjusting structure is not particularly limited, and can adopt the existing structure, such as a spring 18, a spring pressing plate 19 and an adjusting bolt 20 which are matched with each other; the main valve body is provided with an air inlet channel 7, a valve port 8 and an air outlet channel 9; the air inlet channel 7 is communicated with the piston cavity 4, the valve port upper sealing element 3 seals the valve port 8 under the action of the pressure regulating structure, and the valve port 8 is communicated with the air outlet channel 9; when the gas pressure of the gas inlet channel 7 overcomes the pressure of the pressure regulating structure, the gas pushes the piston, and then enters the gas outlet channel 9 through the valve port 8 to be discharged; in order to ensure the stable sealing of the valve port upper sealing element 3 and the valve port 8, a closed protrusion is formed around the upper end of the valve port 8, and the closed protrusion cooperates with the valve port upper sealing element 3 to realize stable sealing.

Further, the spring protection structure 12 is attached to the side wall of the piston cavity 4 or an auxiliary structure 10 disposed on the side wall of the piston cavity 4 and slides under the pushing of the pressure adjusting structure or the gas pressure, and with respect to the establishment of the auxiliary structure 10, it is set according to the size of the piston cavity 4 and the spring protection structure 12, and as for its structure, a sleeve, such as a cylindrical sleeve, is selected that is adapted to the shape of the spring protection structure 12 of the piston.

Further, a pressure relief and noise reduction structure is formed on the main valve body, and specifically, an exhaust channel 13 is formed on the side wall of the piston cavity 4; a filter element 14 is arranged in the exhaust channel 13; the tail end of the exhaust channel 13 is provided with an exhaust diaphragm 15 which is fixedly arranged through a diaphragm bolt 16.

Further, the exhaust port at the end of the exhaust passage 13 is enlarged, and the exhaust diaphragm 15 covers the exhaust port.

Further, in order to prevent gas from flowing back, a check valve structure is arranged in the gas outlet channel 9, and the check valve structure is not particularly limited, for example, the check valve structure includes a spring 18, a check valve spring 21, a spring seat 22, a valve plate 23, and a lower valve port sealing element 24 arranged on the valve plate 23, where the lower valve port sealing element 24 is preferably made of rubber material, and is sealed with the lower end of the valve port 8 under the action of the spring 18, the check valve spring 21; as for the installation manner of the spring seat 22, for example, the installation manner is various, for example, the installation manner is by a screw thread, in this embodiment, the fixing is realized by the action of the check valve spring by clamping the ring-shaped body, and meanwhile, in order to ensure the sealing, the sealing ring is arranged on the circumference of the spring seat 22.

Further, a limiting structure 17 of the check valve structure is further arranged in the air outlet channel 9, the limiting structure is not specifically limited, for example, a ring body is clamped on the side wall of the air outlet channel and is used for matching with the valve plate 23 to limit the check valve structure.

The working process of the overflow valve is as follows: high-pressure gas enters the lower part of the piston through the gas inlet channel 7, enters the valve port 8 after overcoming the pressure of the pressure adjusting structure, and enters the gas outlet channel 9 after overcoming the pressure of the one-way valve structure, and then is discharged.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A piston for an overflow valve comprises a piston main body, wherein the piston main body is provided with a sealing ring along the circumferential direction of the piston main body and a valve port upper sealing element below the piston main body, and is characterized in that a spring protection structure is formed on the periphery of an upper boss of the piston main body.

2. An overflow valve, comprising a main valve body, a piston cavity formed in the main valve body, the piston according to claim 1 being installed in the piston cavity, and a pressure regulating structure disposed above the piston; the main valve body is provided with an air inlet channel, a valve port and an air outlet channel; the air inlet channel is communicated with the piston cavity, the valve port is sealed by a valve port upper sealing element under the action of the pressure adjusting structure, and the valve port is communicated with the air outlet channel; when the gas pressure of the gas inlet channel overcomes the pressure of the pressure adjusting structure, the gas pushes the piston, and then enters the gas outlet channel through the valve port to be discharged.

3. The relief valve according to claim 2, wherein the spring protection structure is attached to the side wall of the piston chamber or an auxiliary structure provided on the side wall of the piston chamber and slides under the urging of the pressure regulating structure or gas pressure.

4. The relief valve according to claim 2 or 3, wherein the piston chamber side wall forms an exhaust passage.

5. The relief valve of claim 4, wherein a filter element is mounted in the vent passage.

6. The excess flow valve of claim 5 wherein the vent passage terminates in a vent diaphragm.

7. The relief valve according to claim 6, wherein the vent-passage-end vent is enlarged, and the vent diaphragm covers the vent.

8. The relief valve according to claim 7, wherein a one-way valve structure is provided in the outlet passage.

9. The overflow valve of claim 8 wherein a limit structure for the one-way valve structure is further disposed in the outlet passage.

10. The relief valve according to claim 9, wherein the pressure regulating structure includes a spring, a spring pressure plate, and an adjusting bolt; the check valve structure comprises a check valve spring, a spring seat, a valve plate and a lower valve port sealing element arranged on the valve plate.