CN217539758U

CN217539758U - Pressure reducing valve with annular sealing structure for locomotive

Info

Publication number: CN217539758U
Application number: CN202221698946.6U
Authority: CN
Inventors: 贺锐; 李朝晖; 李洪德
Original assignee: Qingdao Haifeile Intelligent Manufacturing Co ltd
Current assignee: Qingdao Haifeile Intelligent Manufacturing Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-10-04
Anticipated expiration: 2032-07-01

Abstract

The utility model belongs to the technical field of the relief pressure valve, concretely relates to relief pressure valve for locomotive with ring belt seal structure. The valve comprises a valve body, a valve cover arranged at the upper end of the valve body, a valve rod assembly arranged inside the valve body, an adjusting assembly arranged inside the valve cover, a piston assembly arranged between the valve body and the valve cover, and an annular belt sealing structure which is abutted against the piston assembly arranged at the top of the valve rod assembly. The upper end of the valve rod of the utility model is provided with the annular belt sealing structure with inclination, thereby perfectly avoiding the position where the piston vulcanized rubber is easy to have defects, leading the stress of the piston vulcanized rubber to be more uniform, leading the stress position to be centered, leading the required sealing specific pressure to be smaller and leading the sealing effect to be better; the guide ring is additionally arranged on the piston, so that the piston moves more stably, the coaxiality of the piston and the valve rod can be ensured, the sealing performance is improved, the abrasion is reduced, and the service life is prolonged.

Description

Pressure reducing valve with annular sealing structure for locomotive

Technical Field

The utility model belongs to the technical field of the relief pressure valve, concretely relates to relief pressure valve for locomotive with ring belt seal structure.

Background

The pressure reducing valve structure for the locomotive is shown in figure 3, compressed air enters a valve body, the valve rod vulcanized rubber position of the valve rod can be pressed and attached to a valve seat to realize sealing in an initial state under the action of a pressure spring, and the pressure of an output port is zero. Through the adjusting screw of adjusting valve top, down compression spring promotes the piston and moves down, and then down promotes the valve rod vulcanite position on the valve stem and leaves the disk seat, and compressed air gets into the outlet side to constantly move down along with adjusting screw, outlet pressure increases gradually, and is fixed with adjusting screw locking after obtaining the desired outlet pressure value. If the outlet pressure value has exceeded the set pressure value, the piston can be up promoted by medium pressure, and the bulb that piston vulcanize position can leave the valve rod upper end is sealed face, and pressure gets into the valve gap through the aperture in the middle of the piston, then releases the pressure through the pressure release mouth, until stablizing in the set pressure value, the bulb face of piston vulcanize and valve rod upper end is sealed again.

The existing pressure reducing valve has the following problems in the use process: firstly, the sealing that the bulb sealing surface of the upper end of the valve rod in the pressure reducing valve and the piston vulcanized rubber below the piston realize is unreliable, the edge position of the middle small hole of the piston vulcanized rubber (A position in figure 4) is the position of the die assembly line of the vulcanized rubber die, the flash can be generated at the position when the rubber is vulcanized, the flash residue or the shortage of materials can be easily generated at the later stage when the flash is processed, and the sealing position in the traditional structure is exactly arranged at the position, so the unreliable sealing can be generated. In addition, the requirement on the coaxiality of the valve rod and the piston is quite high in the existing sealing structure, once the valve rod or the piston is inclined, leakage can occur, the thin disc-shaped piston is extremely unstable when reciprocating in the valve body, the inclined piston is very easy to cause leakage, so that pressure is leaked from a pressure relief opening, pressure needs to be continuously supplemented from an air inlet, the output pressure is unstable, the pressure reducing valve needs to frequently act, abrasion is caused, and the service life is shortened. The situation that the piston is inclined and even stuck in the valve body and can not act can occur, so that the pressure reducing valve completely fails; and the output pressure in the pressure reducing valve is adjusted by rotating the adjusting screw to drive the spring gland to move upwards or downwards so as to adjust the compression amount of the spring, and the position where the lower end of the adjusting screw is matched with the spring gland in the conventional pressure reducing valve is conical, so that the pressure reducing valve is unstable in the adjusting process and is easy to wear.

In view of the above problems, the present application provides a pressure reducing valve for a locomotive, which has an annular sealing structure and is more stable in performance.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model provides a relief pressure valve for locomotive with ring belt seal structure to solve the problem that relates to in the background art.

In order to achieve the above object, the utility model adopts the following technical scheme: the pressure reducing valve with the annular sealing structure for the locomotive comprises a valve body and a valve cover arranged at the upper end of the valve body, wherein a valve rod assembly is arranged in the valve body, an adjusting assembly is arranged in the valve cover, a piston assembly is further arranged between the valve body and the valve cover, and the top of the valve rod assembly is provided with the annular sealing structure which is abutted to the piston assembly.

Further, in the above-mentioned case,

the valve stem assembly comprises a valve stem;

the piston assembly comprises a piston and piston vulcanized rubber arranged on the lower end face of the piston, and the piston vulcanized rubber is abutted to the valve rod.

Furthermore, the ring belt sealing structure is a central symmetry structure with a concave cross section, and the top of the ring belt sealing structure is provided with a sealing surface which is abutted against the lower end surface of the piston vulcanized rubber.

Furthermore, the included angle between the sealing surface of the ring belt sealing structure and the vulcanized rubber of the piston is 15 degrees.

Furthermore, the adjusting assembly comprises an adjusting screw arranged at the top of the valve cover and a spring gland arranged inside the valve cover and abutted against the adjusting screw, and a spring is arranged between the spring gland and the piston.

Furthermore, a ball head is arranged at the bottom of the adjusting screw, and a circular groove for accommodating the ball head is formed in the upper end face of the spring gland.

Furthermore, a guide ring is arranged on the outer peripheral side of the piston which is contacted with the inner wall of the valve body.

The utility model discloses the useful part of relief pressure valve for locomotive with clitellum seal structure: the upper end of the valve rod is provided with an annular belt sealing structure with inclination, so that the position where the piston vulcanized rubber is easy to have defects is perfectly avoided, the piston vulcanized rubber is more uniformly stressed, the stressed position is centered, the required sealing specific pressure is lower, and the sealing effect is better; the design of the guide ring is added on the piston, so that the piston moves more stably, and the coaxiality of the piston and the valve rod can be ensured, thereby improving the sealing property; the position of the lower end of the adjusting screw matched with the spring gland is designed to be a spherical structure, so that the influence of lateral force caused by the verticality deviation of the end face of the spring and the axis of the spring can be automatically absorbed, the pressure adjustment is smoother and more stable, meanwhile, the abrasion is reduced, and the service life is prolonged.

Drawings

FIG. 1 is a schematic side sectional view of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of the part B according to the embodiment of the present invention;

FIG. 3 is a schematic side sectional view of a prior art pressure reducing valve;

FIG. 4 is a schematic view of the structure of part C;

reference numbers for parts in the figures illustrate:

adjusting screw 1, spring gland 2, spring 3, valve gap 4, pressure release port 5, piston 6, valve rod 7, valve rod vulcanized rubber 8, valve seat 9, compression spring 10, valve body 11, piston vulcanized rubber 12, bulb sealing surface 13, guide ring 14, bulb 15, circular groove 16, clitellum seal structure 17, sealing surface 18.

Detailed Description

The following further describes the embodiments with reference to the drawings.

The embodiment is as follows:

as shown in fig. 1 to 4, the pressure reducing valve with the annular sealing structure for the locomotive comprises a valve body 11 and a valve cover 4 arranged at the upper end of the valve body 11, wherein a valve rod assembly is arranged inside the valve body 11, an adjusting assembly is arranged inside the valve cover 4, a piston assembly is further arranged between the valve body 11 and the valve cover 4, and an annular sealing structure 17 abutted against the piston assembly is arranged at the top of the valve rod assembly.

The valve stem assembly comprises a valve stem 7; the piston assembly comprises a piston 6 and piston vulcanized rubber 12 arranged on the lower end face of the piston 6, and the piston vulcanized rubber 12 is abutted to the valve rod 7. A guide ring 14 is provided on the outer peripheral side of the piston 6 which contacts the inner wall of the valve body 11. The guide ring 14 enables the clearance of the piston 6 in the cavity of the valve body 11 to be reduced to the lowest, thereby not only improving the stability of the piston 11 in the adjusting process, but also ensuring the position degree thereof, fundamentally solving the problem of clamping stagnation,

the ring belt sealing structure 17 is a central symmetrical structure with a concave cross section, and the top of the ring belt sealing structure 17 is provided with a sealing surface 18 which is abutted with the lower end surface of the piston vulcanized rubber 12. The included angle between the sealing surface 18 of the ring belt sealing structure 17 and the piston vulcanized rubber 12 is 15 degrees. The annular belt sealing structure 17 with the inclination avoids the parting surface of the piston vulcanized rubber 12 perfectly, has a sealing surface with the inclination of 15 degrees, reduces the sealing specific pressure to the lowest, greatly improves the sealing performance, and reduces the dependency on the coaxiality of parts.

The adjusting component comprises an adjusting screw 1 arranged at the top of the valve cover 4, a spring gland 2 arranged inside the valve cover 4 and abutted to the adjusting screw 1, and a spring 3 arranged between the spring gland 2 and the piston 6. The bottom of adjusting screw 1 is equipped with bulb 15, the up end of spring gland 2 is equipped with the circular recess 16 that holds bulb 15. The ball head 15 structure of the adjusting screw 1 enables pressure adjustment to be more stable, the problem of serious abrasion of a traditional conical structure is avoided, adjustment is smoother, and the stability of the spring 3 is more superior.

The conventional pressure reducing valve structure is shown in fig. 3: the ball head sealing surface 13 at the upper end of the valve rod 7 is matched with vulcanized rubber on the piston 6 to realize sealing, the sealing is unreliable, and pressure leakage easily occurs to cause unstable output pressure and frequent adjustment, so that the abrasion is aggravated, and the service life is short. The flat piston 6 is easy to incline during reciprocating motion, so that pressure leakage is caused, even clamping stagnation is caused, and pressure regulation failure is caused. The conical adjusting structure at the lower end of the adjusting screw 1 causes unstable adjustment and is easy to wear.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a relief pressure valve for locomotive with ring tape seal structure, includes the valve body, locates the valve gap of valve body upper end, the inside valve rod subassembly that is equipped with of valve body, the inside adjusting part that is equipped with of valve gap, still be equipped with piston assembly, characterized by between valve body and the valve gap: and the top of the valve rod assembly is provided with an annular belt sealing structure which is abutted against the piston assembly.

2. The pressure reducing valve for a locomotive having an endless belt sealing structure according to claim 1, wherein:

the valve stem assembly comprises a valve stem;

3. The pressure reducing valve for a locomotive with an annulus sealing structure according to claim 2, wherein: the ring belt sealing structure is a central symmetrical structure with a concave cross section, and the top of the ring belt sealing structure is provided with a sealing surface which is abutted against the lower end face of the piston vulcanized rubber.

4. The pressure reducing valve for a locomotive with an annulus sealing structure according to claim 3, wherein: the included angle between the sealing surface of the ring belt sealing structure and the piston vulcanized rubber is 15 degrees.

5. The pressure reducing valve for a locomotive having an endless belt sealing structure according to claim 2, wherein: the adjusting component comprises an adjusting screw arranged at the top of the valve cover and a spring gland which is arranged inside the valve cover and is abutted against the adjusting screw, and a spring is arranged between the spring gland and the piston.

6. The pressure reducing valve for a locomotive having an endless belt sealing structure according to claim 5, wherein: the bottom of adjusting screw is equipped with the bulb, the up end of spring gland is equipped with the circular recess that holds the bulb.

7. The pressure reducing valve for a locomotive having an endless belt sealing structure according to claim 2, wherein: and a guide ring is arranged on the periphery of the piston which is in contact with the inner wall of the valve body.