CN216045638U

CN216045638U - Pressure back-off valve for railway and subway vehicles

Info

Publication number: CN216045638U
Application number: CN202122092601.8U
Authority: CN
Inventors: 张玄; 徐步都; 祝晓宇; 蔡君国; 赵国瑞
Original assignee: Zhejiang Ruili Air Compressor Equipment Co ltd
Current assignee: Zhejiang Ruili Air Compressor Equipment Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-15
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a pressure back-off valve for a rail subway vehicle, which comprises: the main body is internally provided with a cavity, a fluid hole is formed in the cavity, a fluid inlet and a fluid outlet are formed in one side wall body of the main body, and the fluid inlet and the fluid outlet are communicated with each other through the fluid hole; be equipped with first fixed part, case subassembly and second fixed part in the cavity, first fixed part and second fixed part all with the outer wall connection of cavity, the case subassembly forms the widening portion, the both ends of case subassembly respectively with first fixed part and second fixed part sliding connection for the shutoff of widening portion or open the fluid hole. Because the both ends of case subassembly respectively with first fixed part and second fixed part sliding connection, during pressure reclose valve for rail subway vehicle during operation, the case subassembly is reciprocating motion between first fixed part and second fixed part, even the case subassembly side receives fluidic impact, is difficult for producing off-centre, and the pressure reclose valve for rail subway vehicle of this scheme moves more firmly promptly.

Description

Pressure back-off valve for railway and subway vehicles

Technical Field

The utility model relates to the technical field of valve bodies, in particular to a pressure back-closing valve for a railway metro vehicle.

Background

The pressure back-off valve is a valve for preventing media from flowing backwards, is also called as a check valve, a one-way valve, a reflux valve and a back pressure valve, and is widely applied to industry.

Patent document CN201921185361.2 discloses a panel-type installation type check valve, in which: "set up inlet and liquid outlet on the main part lateral wall, form between inlet, liquid outlet and the valve gap and only flow back the cavity, inlet and liquid outlet port orientation are the same, the valve rod stretches into the inside tip of main part and extends to inlet and the department that communicates of non return cavity, and the valve rod tip is provided with the non return case", "be provided with the non return spring between non return case and the valve gap", "the valve rod tip is provided with the non return case, and the non return case is the conical surface structure and just to the liquid outlet", "the sealing washer is through setting up the pressure cover and the nut fastening at the valve rod tip".

In prior art, the axis direction back and forth movement of check case along the valve rod under the drive of non return spring for form between inlet and the non return flow chamber and cut or communicate, when cutting between inlet and the non return flow chamber, form the separation effect to the liquid backward flow, when communicateing between inlet and the non return flow chamber, liquid is by inlet flow direction liquid outlet.

However, one end of the valve core is fixed, and the other end of the valve core is free, so that large impact pressure can be formed on the side surface of the valve core in the liquid flowing process, the valve core is eccentric, and a sealing ring arranged on the valve core is eccentric; thus, a gap is easily generated between part of the sealing ring and the inner wall of the main body, so that part of liquid flows back from the gap, and the valve body fails.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides the pressure back-off valve for the railway vehicle, which is more firm in valve core fixation.

A pressure back-off valve for a rail railcar, comprising: the main body is internally provided with a cavity, a fluid hole is formed in the cavity, a fluid inlet and a fluid outlet are formed in one side wall body of the main body, and the fluid inlet and the fluid outlet are communicated with each other through the fluid hole; be equipped with first fixed part, case subassembly and second fixed part in the cavity, first fixed part and second fixed part all with the outer wall connection of cavity, the case subassembly forms the widening portion, the both ends of case subassembly respectively with first fixed part and second fixed part sliding connection for the shutoff of widening portion or open the fluid hole.

Furthermore, a second accommodating cavity is formed in the second fixing part, and the lower end of the valve core assembly extends into the second accommodating cavity.

Furthermore, a second breathing hole is formed in the side wall of the second fixing portion, and the second accommodating cavity is communicated with the second breathing hole.

Furthermore, the second fixing part is detachably connected with the outer wall of the cavity.

Further, the case subassembly includes valve rod and rubber sleeve, and the both ends of valve rod respectively with first fixed part and second fixed part sliding connection, the valve rod forms the widening portion, and the widening portion overcoat has the rubber sleeve.

Further, the lower end of the valve rod extends into the second accommodating cavity.

Further, a step is formed in the cavity, and the step is provided with a fluid hole; the bottom of the rubber sleeve is provided with a rubber convex edge, and the valve rod drives the rubber convex edge to contact with or separate from the step, so that the widening part plugs or opens the fluid hole.

Further, a spring seat is formed at the top end of the rubber sleeve, and a contact surface is formed at the bottom of the spring seat; the first fixing part comprises a head part and a rod part which are integrally formed, the head part is in threaded connection with the inner wall of the main body, and the rod part is in sliding connection with the upper end of the valve rod; the spring is simultaneously sleeved on the spring seat and the rod part, one end of the spring is abutted against the contact surface, and the other end of the spring is abutted against the head part.

Furthermore, a first accommodating cavity is arranged in the rod part, and the upper end of the valve rod extends into the first accommodating cavity.

Furthermore, the side wall of the rod part is provided with a first breathing hole, and the first accommodating cavity is communicated with the first breathing hole.

Compared with the prior art, the utility model has the advantages that:

1. in this scheme, because the both ends of case subassembly respectively with first fixed part and second fixed part sliding connection, during the pressure back-off valve for rail subway vehicle worked, the case subassembly was reciprocating motion between first fixed part and second fixed part, even the case subassembly side receives fluidic impact, is difficult for producing off-centre, and the pressure back-off valve for rail subway vehicle of this scheme operation is more firm promptly.

2. Due to the arrangement of the second breathing hole, when the lower end of the valve core assembly stretches in the second accommodating cavity, the second accommodating cavity can rapidly suck or release fluid through the second breathing hole, and the phenomenon that the fluid pressure in the second accommodating cavity is too large or too small is prevented, so that the resistance of the valve core assembly in the second accommodating cavity is too large or too small.

3. The widened part of the valve rod is sleeved with a rubber sleeve, and the widened part is contacted with or separated from the step through a rubber convex edge on the rubber sleeve, so that the widened part plugs or opens the fluid hole; the rubber convex edge is in soft contact with the step, so that the surface integrity of each part is well protected, and the service life of each part such as the widening part and the step is prolonged.

4. The spring seat and the rod part are arranged, so that the function of guiding the telescopic direction of the spring is achieved, and the spring is prevented from being eccentric in the telescopic process.

5. Due to the arrangement of the first breathing hole, when the upper end of the valve core assembly moves in the first accommodating cavity, the first accommodating cavity can rapidly absorb fluid or release fluid through the first breathing hole, so that the volume of the fluid in the first accommodating cavity is changed, the fluid pressure in the first accommodating cavity is prevented from being too large or too small, and the resistance of the valve core assembly in the first accommodating cavity is prevented from being too large or too small.

Drawings

Fig. 1 is a schematic structural view of a pressure back-closing valve for a railway vehicle according to the present invention;

fig. 2 is a schematic structural view of the valve core assembly.

1-sealing cover, 101-input chamber, 102-output chamber, 103-fluid inlet, 104-fluid outlet, 301-head, 302-rod, 303-first containing cavity, 305-first breathing hole, 4-spring, 5-valve core component, 501-valve rod, 502-rubber sleeve, 503-widening part, 504-spring seat, 505-contact surface, 506-rubber convex edge, 601-second containing cavity, 603-second breathing hole, 7-main body, 701-cavity, 702-step, 703-fluid hole and 704-valve body.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1 to 2, a pressure back-off valve for a railway vehicle according to a preferred embodiment of the present invention includes: a main body 7, a cavity 701 is formed in the main body 7, a fluid hole 703 is formed in the cavity 701, a fluid inlet 103 and a fluid outlet 104 are formed on one side wall body of the main body 7, and the fluid inlet 103 and the fluid outlet 104 are communicated with each other through the fluid hole 703; the cavity 701 is internally provided with a first fixing part, a valve core assembly 5 and a second fixing part, the first fixing part and the second fixing part are both connected with the outer wall of the cavity 701, the valve core assembly 5 forms a widening part 503, and two ends of the valve core assembly 5 are respectively in sliding connection with the first fixing part and the second fixing part, so that the widening part 503 plugs or opens the fluid hole 703.

The main body 7 comprises a sealing cover 1 and a valve body 704, the sealing cover 1 is detachably connected with the valve body 704 through a screw, and a sealing ring is arranged at the contact position of the sealing cover 1 and the valve body 704, so that the sealing cover 1 and the valve body 704 are sealed with each other; the valve body 704 is in a hollow cuboid structure or a hollow cylindrical structure, a cavity 701 is formed in the wall of the valve body 704, and the opening of the cavity 701 is sealed by the sealing cover 1, so that the cavity 701 is independent and sealed from the outside.

A step 702 is formed in the cavity 701, the step 702 is provided with a fluid hole 703, and the fluid hole 703 can be a circular hole or a square hole; an input chamber 101 is formed between the fluid inlet 103 and the fluid aperture 703, and the portion of the cavity 701 excluding the input chamber 101 is the output chamber 102.

The second fixing portion and the outer wall of the cavity 701, preferably the bottom wall of the valve body 704, may be fixedly connected or detachably connected, preferably detachably connected, for example, a mounting groove is provided on the valve body 704, and the outer surface of the second fixing portion is in interference fit with the mounting groove, so that the second fixing portion is mounted on the bottom wall of the valve body 704; a second accommodating cavity 601 is formed in the second fixing part, the lower end of the valve core assembly 5 extends into the second accommodating cavity 601, and the lower end of the valve core assembly 5 is in sliding connection with the side wall of the second accommodating cavity 601; the second fixing portion side wall is provided with a second breathing hole 603, the second accommodating cavity 601 is communicated with the second breathing hole 603, and when the lower end of the valve core assembly 5 moves in the second accommodating cavity 601, the fluid pressure in the second accommodating cavity 601 can be adjusted through the second breathing hole 603, so that the fluid pressure in the second accommodating cavity 601 is prevented from being too high or too low, and the movement of the valve core assembly 5 is prevented from being influenced. Specifically, the second fixing portion is a cylinder.

The valve core assembly 5 comprises a valve rod 501 and a rubber sleeve 502, two ends of the valve rod 501 are respectively connected with a first fixing part and a second fixing part in a sliding manner, the lower end of the valve rod 501 extends into the second accommodating cavity 601, and preferably, the lower end of the valve rod 501 is connected with the side wall of the second accommodating cavity 601 in a sliding and sealing manner; the valve stem 501 forms a widened part 503, and the diameter of the widened part 503 is larger than that of the fluid hole 703; optionally, the widened portion 503 is a rectangular parallelepiped or cylindrical structure, and preferably, the widened portion 503 and the valve rod 501 are integrally formed; the widened part 503 is externally sleeved with a rubber sleeve 502.

The rubber sleeve 502 is made of vulcanized rubber which has high elasticity and tensile strength, the bottom of the rubber sleeve 502 is provided with a rubber convex edge 506, the rubber sleeve 502 and the rubber convex edge 506 are integrally formed, the rubber convex edge 506 is an annular convex edge, the rubber convex edge 506 is also made of vulcanized rubber, and the valve rod 501 drives the rubber convex edge 506 to contact with or separate from the step 702, so that the widening part 503 plugs or opens the fluid hole 703; the top end of the rubber sleeve 502 forms a spring seat 504, the spring seat 504 is in a circular truncated cone shape, and the bottom of the spring seat 504 forms a contact surface 505.

The first fixing portion includes a head portion 301 and a shaft portion 302 which are integrally formed; threads are processed on the outer ring of the head 301 and the inner wall of the valve body 704, and the head 301 is in threaded connection with the inner wall of the valve body 704; the rod portion 302 is slidably connected with the upper end of the valve rod 501, specifically, a first accommodating cavity 303 is arranged in the rod portion 302, the upper end of the valve rod 501 extends into the first accommodating cavity 303, and preferably, the upper end of the valve rod 501 is slidably and hermetically connected with the side wall of the first accommodating cavity 303; the side wall of the rod portion 302 is provided with a first breathing hole 305, the first accommodating cavity 303 is communicated with the first breathing hole 305, and when the upper end of the valve rod 501 moves in the first accommodating cavity 303, the fluid pressure in the first accommodating cavity 303 can be adjusted through the first breathing hole 305, so that the phenomenon that the fluid pressure in the first accommodating cavity 303 is too high or too low is avoided, and the movement of the valve rod 501 is influenced.

The spring 4 is sleeved on the spring seat 504 and the rod part 302 at the same time, one end of the spring 4 is abutted against the contact surface 505, and the other end is abutted against the head part 301; the spring 4 is a coil spring.

In this scheme, the pressure back-off valve for the rail subway vehicle can flow in fluid such as liquid or gas, uses the fluid to demonstrate the theory of operation of the pressure back-off valve for the rail subway vehicle of this application as gaseous below for the example.

When the pneumatic valve is used, gas enters from the fluid inlet 103, passes through the input chamber 101 and reaches the fluid hole 703, and along with the gradual increase of the air pressure in the input chamber 101, the gas overcomes the elastic force of the spring 4 and the self gravity of the valve core assembly 5 at the fluid hole 703 and pushes the valve core assembly 5 to move upwards until the rubber convex edge 506 is separated from the step 702, the fluid hole 703 is opened, and the input chamber 101 is communicated with the output chamber 102; when the pressure of the gas delivered from the fluid inlet 103 is reduced, or when the gas flows back into the valve body 704 through the fluid outlet 104, as the gas pressure of the output chamber 102 at the fluid hole 703 gradually increases, the gas pressure of the input chamber 101 is insufficient to overcome the resultant force of the elastic force of the spring 4, the self-gravity of the valve core assembly 5 and the gas pressure in the output chamber 102, so that the valve core assembly 5 moves downward under the effect of the resultant force until the rubber flange 506 contacts the step 702, the fluid hole 703 is blocked by the rubber sleeve 502, at this time, the gas cannot enter the input chamber 101 from the output chamber 102 through the fluid hole 703, and the pressure-return valve for the railway vehicle completes the check function.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pressure back-off valve for a rail railcar, comprising: the device comprises a main body (7), wherein a cavity (701) is formed in the main body (7), a fluid hole (703) is formed in the cavity (701), a fluid inlet (103) and a fluid outlet (104) are formed in one side wall body of the main body (7), and the fluid inlet (103) and the fluid outlet (104) are communicated with each other through the fluid hole (703); the novel valve core assembly is characterized in that a first fixing portion, a valve core assembly (5) and a second fixing portion are arranged in the cavity (701), the first fixing portion and the second fixing portion are connected with the outer wall of the cavity (701), the valve core assembly (5) forms a widening portion (503), and two ends of the valve core assembly (5) are in sliding connection with the first fixing portion and the second fixing portion respectively, so that the widening portion (503) plugs or opens a fluid hole (703).

2. The pressure valve for the railway subway vehicle as claimed in claim 1, wherein a second receiving chamber (601) is formed in the second fixing portion, and a lower end of the valve core assembly (5) extends into the second receiving chamber (601).

3. The pressure back-closing valve for the railway and subway vehicle as claimed in claim 2, wherein a second breathing hole (603) is formed in a side wall of the second fixing portion, and the second accommodating cavity (601) is communicated with the second breathing hole (603).

4. The pressure valve for the railway subway vehicle as claimed in claim 3, wherein the second fixing portion is detachably connected to an outer wall of the cavity (701).

5. The pressure valve for the railway subway vehicle as claimed in any one of claims 1-4, wherein the valve core assembly (5) comprises a valve rod (501) and a rubber sleeve (502), two ends of the valve rod (501) are slidably connected with the first fixing portion and the second fixing portion respectively, the valve rod (501) forms a widening portion (503), and the rubber sleeve (502) is sleeved outside the widening portion (503).

6. The pressure valve for the railway subway vehicle as claimed in claim 5, wherein the lower end of the valve rod (501) is extended into the second accommodating cavity (601).

7. The pressure back-off valve for the railway subway vehicle as claimed in claim 6, wherein a step (702) is formed in the cavity (701), and the step (702) is opened with a fluid hole (703); the bottom of the rubber sleeve (502) is provided with a rubber convex edge (506), and the valve rod (501) drives the rubber convex edge (506) to be in contact with or separated from the step (702), so that the widening part (503) plugs or opens the fluid hole (703).

8. The pressure valve for the railway and subway vehicle as claimed in claim 7, wherein a top end of said rubber sleeve (502) forms a spring seat (504), and a bottom of said spring seat (504) forms a contact surface (505); the first fixing part comprises a head part (301) and a rod part (302) which are integrally formed, the head part (301) is in threaded connection with the inner wall of the main body (7), and the rod part (302) is in sliding connection with the upper end of the valve rod (501); the spring (4) is sleeved on the spring seat (504) and the rod part (302), one end of the spring (4) is abutted against the contact surface (505), and the other end of the spring (4) is abutted against the head part (301).

9. The pressure back-off valve for the railway subway vehicle as claimed in claim 8, wherein a first accommodating cavity (303) is arranged in the rod portion (302), and the upper end of the valve rod (501) extends into the first accommodating cavity (303).

10. The pressure back-closing valve for the railway and subway vehicles as claimed in claim 9, wherein the side wall of the rod portion (302) is provided with a first breathing hole (305), and the first accommodating cavity (303) is communicated with the first breathing hole (305).