CN113175550A - Slide valve assembly - Google Patents

Abstract

The invention provides a sliding valve assembly which comprises a valve sleeve, a valve rod, a sliding valve seat and a spring, wherein the valve sleeve is arranged on the sliding valve seat and forms a first accommodating space; the valve rod can be switched between an extending state and a retracting state, when the valve rod is in the retracting state, the valve rod moves to the first position, and when the valve rod is in the extending state, the valve rod moves to the second position.

Description

Slide valve assembly

Technical Field

The invention relates to the technical field of valves, in particular to a sliding valve assembly.

Background

The slide valve is a flow dividing valve which utilizes a valve core (plunger piston and valve clack) to slide on a sealing surface and changes the positions of fluid inlet and outlet channels to control the flow direction of fluid. Slide valves are commonly used in steam engines, hydraulic and pneumatic devices, to allow the movement mechanism to achieve a predetermined direction and stroke of motion or to achieve automatic continuous operation.

According to the structure and action characteristics, the slide valve is divided into a reciprocating type and a rotary type, a valve rod and a gasket surface in the conventional reciprocating type slide valve structure are in limit fit, the depth is difficult to control when the valve rod and the gasket are screwed in, and on one hand, the transitional extrusion of a spring is often caused due to the fact that effective stroke control does not exist on one surface of the valve rod connected with the spring, as shown in fig. 4. On the other hand, the sealing gasket is often damaged due to the fact that effective stroke limitation does not exist on the surface, in contact with the sliding valve shell, of the valve rod, meanwhile, the fluid bearing space can extend to the area where the spring reaches, the spring is corroded due to moisture in the spring containing space, the limit single-side allowance between the valve rod and the valve sleeve is only 0.15mm, as shown in a part A in fig. 5, the force applied to the valve rod is about 1000N when the gun is opened at each time, valve rod deformation can occur after long-time opening and closing, the situation that equipment is shut down and cannot be used normally due to the fact that the valve rod is stuck seriously occurs, the valve sleeve is damaged and cannot be used continuously at the moment, the sliding valve spring and the sealing structure are poor in reliability, the spring is prone to rusting and cannot reset, water leakage occurs after long-time operation, and normal use is seriously affected.

Patent document CN108661964A discloses a slide valve type symmetric cylinder bidirectional hydraulic balance system, which includes a slide valve type hydraulic balance valve and an oil cylinder; the slide valve type hydraulic balance valves are used in pairs and are divided into a left slide valve balance valve and a right slide valve balance valve, but the design still does not limit the movement stroke of the balance valves, and excessive extrusion of a spring can still be caused, so that the service life of equipment is influenced.

Disclosure of Invention

In view of the deficiencies in the prior art, it is an object of the present invention to provide a slide valve assembly.

According to the invention, the sliding valve assembly comprises a valve sleeve, a valve rod, a sliding valve seat and a spring;

the valve sleeve is arranged on the sliding valve seat and forms a first accommodating space, a fluid space and a flow channel are arranged on the sliding valve seat, and the fluid space is communicated with an external space through the flow channel;

one end of the valve rod is slidably arranged in the fluid space, and the other end of the valve rod penetrates through the first accommodating space and extends to the outside of the valve sleeve;

the spring is sleeved on the valve rod and is arranged between the valve sleeve and the valve rod;

the valve stem is switchable between an extended state and a retracted state, the valve stem being moved to a first position when the valve stem is in the retracted state and the valve stem being moved to a second position when the valve stem is in the extended state.

Preferably, the valve rod is provided with a limiting boss, when the valve rod moves to a first position in a direction towards the slide valve seat, the limiting boss is limited by the slide valve seat, and when the valve rod moves to a second position in a direction away from the slide valve seat, the limiting boss is limited by the valve sleeve.

Preferably, when the valve rod moves to the first position, the end surface of the valve rod facing one end of the slide valve seat is in clearance fit with the slide valve seat.

Preferably, one end of the spring is connected with the limiting boss, and the other end of the spring is connected with the valve sleeve;

when the valve rod is at the first position and the second position, the spring is in a compressed state.

Preferably, the diameter of the limiting boss is larger than that of the spring.

Preferably, a first groove is formed in the spool seat, and a first sealing member is arranged on the first groove.

Preferably, the end of the valve stem mounted in the fluid space is provided with a second groove, a sealing assembly is arranged on the second groove and the sealing assembly is arranged between the valve stem and the slide valve seat.

Preferably, the seal assembly includes a second seal and a sealing barrier disposed on either side of the second seal.

Preferably, a valve sleeve hole is formed in the valve sleeve, and the valve rod extends to the outside of the valve sleeve through the valve sleeve hole, wherein the valve rod and the valve sleeve are in clearance fit in the valve sleeve hole.

Preferably, the valve housing is detachably connected with the slide valve seat;

and a sealing groove is formed in one end, far away from the slide valve seat, of the valve sleeve along the circumferential direction.

Compared with the prior art, the invention has the following beneficial effects:

1. the slide valve assembly is additionally provided with the slide valve seat, the valve rod is circumferentially provided with the limiting boss, the limiting boss is in large-area blocking contact limiting with the valve sleeve and the slide valve seat respectively, the movement stroke of the valve rod is limited between the first position and the second position, and the working stability of the slide valve assembly is improved.

2. When the valve rod moves to the first position, the gap is arranged between the end part of the valve rod and the slide valve seat, so that the valve rod is protected, the situation that the head part of the valve rod deforms due to impact in the reciprocating motion process is avoided, the service life of equipment is prolonged, and the working efficiency is improved.

3. In the valve sleeve hole, the valve rod and the valve sleeve are in clearance fit, so that the condition that the valve rod is not smooth due to friction with the inner wall of the valve sleeve in the reciprocating motion process of the valve rod can be effectively avoided, the third sealing element is damaged when the valve rod moves to extend out, the protection of a sealing part in equipment is facilitated, the service life of the equipment is prolonged, and unnecessary maintenance is reduced.

4. According to the invention, the two ends of the valve rod are respectively provided with the sealing structure with the double blocking sleeves, so that the movement space of the valve rod is separated from the external space, and the sealing property in the device is ensured.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the structure of the slide valve assembly;

FIG. 3 is a schematic view of the mating structure of each end face and the sealing structure of both ends of the valve stem in the present invention;

FIG. 4 is a schematic view of a prior art slide valve assembly coupled to a microswitch box;

fig. 5 is a schematic structural view of the connection between a valve rod boss and a valve sleeve in the prior art, wherein a part a in the figure shows that when a boss on the circumferential direction of a valve rod 2 moves to abut against the inner wall of the valve sleeve, the area that the valve rod boss can block is small, and in frequent reciprocating motion, the valve rod boss is easy to impact and damage, and the valve rod boss is easy to enter a valve sleeve hole and is blocked;

FIG. 6 is a schematic view showing the construction of a slide valve assembly according to embodiment 2;

fig. 7 is a schematic structural view of a slide valve assembly in embodiment 3.

The figures show that:

valve housing 1 fluid space 7 sealing spacer sleeve 13

Valve rod 2 flow passage 8 third sealing element 14

Slide valve seat 3 sealing groove 9 fourth seal 15

Valve sleeve hole 4 limiting boss 10 microswitch box 16

Spring 5 first seal 11 microswitch 17

First accommodation space 6 and second sealing element 12 pump cover 18

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example 1:

the present invention provides a sliding valve assembly, as shown in fig. 1, comprising a valve housing 1, a valve rod 2, a sliding valve seat 3 and a spring 5, wherein the valve housing 1 is mounted on the sliding valve seat 3 and forms a first accommodation space 6, the valve housing 1 and the sliding valve seat 3 are preferably in threaded connection, a fluid space 7 and a flow passage 8 are arranged on the sliding valve seat 3, the fluid space 7 is communicated with an external space through the flow passage 8, one end of the valve rod 2 is slidably mounted in the fluid space 7, the other end of the valve rod 2 passes through the first accommodation space 6 and extends to the outside of the valve housing 1, wherein the other end of the valve rod 2 can slide relative to the valve housing 1 under the driving of an external force, a valve housing hole 4 is arranged on the valve housing 1, the valve rod 2 extends to the outside of the valve housing 1 through the valve housing hole 4, wherein, in the valve housing hole 4, the valve rod 2 and the valve sleeve 1 are in clearance fit, as shown in fig. 3, a clearance is formed between the valve rod 2 and the valve sleeve 1, so that the valve rod 2 does not have relative friction in the reciprocating motion process, the friction damage of the valve rod 2 and the valve sleeve 1 is reduced, and the service life of the equipment is prolonged.

Further, a third sealing element 14 is arranged between the end part of the valve sleeve 1, which is provided with the end of the valve sleeve hole 4, and the valve rod 2, and the third sealing element 14 comprises a flat gasket and O-shaped rings at two ends of the flat gasket, so that the sealing performance of the first accommodating space 6 can be effectively ensured.

Specifically, the spring 5 is sleeved on the valve rod 2 and is arranged between the valve sleeve 1 and the valve rod 2, the valve rod 2 can be switched between an extended state and a retracted state, when the valve rod 2 is in the retracted state, the valve rod 2 moves to a first position, when the valve rod 2 is in the extended state, the valve rod 2 moves to a second position, the valve rod 2 is provided with a limiting boss 10, when the valve rod 2 moves to the first position in a direction towards the spool seat 3, the limiting boss 10 is limited by the spool seat 3, and at this time, a contact area between the limiting boss 10 and the spool seat 3 is larger than that in the prior art (such as a position in fig. 5), as shown in fig. 3 and fig. 5. When the valve rod 2 moves to the second position in the direction away from the slide valve seat 3, the limiting boss 10 is limited by the valve sleeve 1, compared with the prior art (shown in fig. 4), the compression amount of the spring 5 is limited within a certain range, and the situation that the spring 5 is excessively extruded and damaged is avoided.

Specifically, as shown in fig. 1, in a preferred example, when the valve rod 2 moves to the first position, an end surface of one end of the valve rod 2 facing the slide valve seat 3 is in clearance fit with the slide valve seat 3, that is, the end surface is in non-contact fit as shown in fig. 3, so that the valve rod 2 does not have the situation of head impact deformation during reciprocating motion, and the service life of the device is prolonged.

Specifically, one end of the spring 5 is connected to the limit boss 10, the other end of the spring 5 is connected to the valve housing 1, it should be noted that the diameter of the limit boss 10 is larger than the diameter of the spring 5, when the valve rod 2 is at the first position and the second position, the spring 5 is in a compressed state,

specifically, as shown in fig. 1, the slide valve seat 3 is provided with a first groove, the first groove is provided with a first sealing member 11, the first sealing member 11 is preferably an O-ring, such as a rubber O-ring, and the first sealing member 11 is used for sealing the connected pump device.

The valve sleeve 1 is provided with a valve sleeve hole 4 communicated with the outside, the valve rod 2 can extend to the outside of the valve sleeve 1 through the valve sleeve hole 4, the diameter of the spring 5 is larger than that of the valve sleeve hole 4, so that the spring 5 can be bound in the first accommodating space 6, as shown in fig. 1, in the valve sleeve hole 4, the valve rod 2 is in clearance fit with the valve sleeve 1, therefore, the third sealing element 14 which is not smooth due to friction with the valve sleeve and is damaged when the valve rod 2 moves through is avoided in the reciprocating process of the valve rod 2, wherein the third sealing element 14 is arranged in the circumferential direction of one end, far away from the first accommodating space 6, of the valve rod 2, the third sealing element 14 preferably comprises a flat gasket and O-shaped rings arranged on two sides of the flat gasket, and the sealing effect is greatly increased through the adoption of the structures of the flat gasket and the double check rings.

Specifically, as shown in fig. 1, one end of the valve rod 2 installed in the fluid space 7 is provided with a second groove, the second groove is provided with a sealing assembly, the sealing assembly is arranged between the valve rod 2 and the sliding valve seat 3, the sealing assembly comprises a second sealing element 12 and sealing retaining sleeves 13 arranged on two sides of the second sealing element 12, the second sealing element 12 preferably adopts a split retaining ring, the sealing retaining sleeves 13 preferably adopt O-rings, and effective isolation of the first accommodating space 6 and the fluid space 7 can be ensured through the sealing assembly.

Preferably, the valve housing 1 is detachably connected to the slide valve seat 3, preferably by a screw connection.

Specifically, as shown in fig. 1, the circumferential edge of one end of the valve rod 2 facing the flow channel 8 is chamfered, so that on one hand, the end face sealing of the valve rod 2 is not affected to block the flow channel 8, on the other hand, the inner wall of the slide valve seat 3 is prevented from being scratched, and the sliding friction force is effectively reduced.

Example 2:

this embodiment is a preferred embodiment of embodiment 1.

As shown in fig. 6, one end of the slide valve assembly in this embodiment, which is provided with the slide valve seat 3, is mounted on a pump cover 18, the pump cover 18 is communicated with the fluid space 7 through a flow passage 8, the other end of the slide valve assembly is connected with a micro switch box 16, a micro switch 17 is arranged inside the micro switch box 16, when the pump operates, fluid pressure in the pump cover 18 becomes large and enters the fluid space 7 through the flow passage 8, and when the fluid pressure is greater than the compression elastic force of the spring 5, the square valve rod 2 moves towards the micro switch box 16 and enters the micro switch box 16 and drives the micro switch to act to realize the required control.

Example 3:

this embodiment is a modification of embodiment 1.

As shown in fig. 7, in this embodiment, two slide valve assemblies are installed on the pump cover 18, wherein the two slide valve assemblies are respectively connected with a micro switch box 16, when the pump is powered on, the overall pressure in the pump cover 18 rises, the slide valve rod 2 at the normally closed position of the left micro switch 17 is stressed and ejected, the micro switch 17 is turned off from closed, the slide valve rod 2 at the normally open position of the right micro switch 17 is stressed and ejected, the micro switch 17 is turned off from open to closed, at this time, the high-voltage machine in the pump normally works, when the gun is turned off, the pressure in the pump is zero, the right micro switch is turned off from closed to open, the left slide valve assembly is still in a high-voltage state, the left micro switch still maintains an open state, and the whole machine is turned off to work, thereby achieving the gun turning off and stopping functions.

The working principle of the invention is as follows:

when the pressure of fluid in equipment connected with the flow passage 8 is greater than the elastic force of the spring 5 pressing the limiting boss 10, the fluid flows into the fluid space 7 from the flow passage 8, so that the valve rod 2 slides towards the valve sleeve hole 4 under the action of the fluid pressure, and the valve rod 2 is in an extending state; when the flowing pressure of the flow passage 8 is smaller than the elastic force of the spring 5 pressing the limiting boss 10, under the elastic force of the spring 5 pressing the limiting boss 10, the valve rod 2 is pushed by the spring 5 and slides towards the direction of the flow passage 8, and the valve rod 2 is in a retraction state.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. A slide valve assembly, comprising a valve housing (1), a valve stem (2), a slide valve seat (3) and a spring (5);

the valve sleeve (1) is arranged on the sliding valve seat (3) and forms a first accommodating space (6), a fluid space (7) and a flow channel (8) are arranged on the sliding valve seat (3), and the fluid space (7) is communicated with an external space through the flow channel (8);

one end of the valve rod (2) is slidably arranged in the fluid space (7), and the other end of the valve rod (2) penetrates through the first accommodating space (6) and extends to the outside of the valve sleeve (1);

the spring (5) is sleeved on the valve rod (2) and is arranged between the valve sleeve (1) and the valve rod (2);

the valve rod (2) can be switched between an extended state and a retracted state, when the valve rod (2) is in the retracted state, the valve rod (2) moves to a first position, and when the valve rod (2) is in the extended state, the valve rod (2) moves to a second position.

2. A slide valve assembly according to claim 1, characterized in that the valve rod (2) is provided with a limiting boss (10), the limiting boss (10) being limited by the slide valve seat (3) when the valve rod (2) is moved to the first position in a direction towards the slide valve seat (3), the limiting boss (10) being limited by the valve sleeve (1) when the valve rod (2) is moved to the second position in a direction away from the slide valve seat (3).

3. A sliding valve assembly according to claim 2 characterised in that the end face of the valve stem (2) facing the end of the sliding valve seat (3) is in a clearance fit with the sliding valve seat (3) when the valve stem (2) is moved to the first position.

4. A sliding valve assembly according to claim 2, characterized in that one end of the spring (5) is connected to the limit boss (10) and the other end of the spring (5) is connected to the valve housing (1);

when the valve rod (2) is at the first position and the second position, the spring (5) is in a compressed state.

5. A sliding valve assembly according to claim 2, characterised in that the diameter of the limit boss (10) is greater than the diameter of the spring (5).

6. A sliding valve assembly according to claim 1, characterised in that the seat (3) is provided with a first groove, on which a first seal (11) is provided.

7. A sliding valve assembly according to claim 1, characterized in that the end of the valve rod (2) mounted in the fluid space (7) is provided with a second groove on which a sealing assembly is arranged and which is arranged between the valve rod (2) and the sliding valve seat (3).

8. A sliding valve assembly according to claim 7 characterised in that the sealing assembly comprises a second seal (12) and a sealing sleeve (13) disposed on either side of the second seal (12).

9. A sliding valve assembly according to claim 2, characterized in that the valve housing (1) is provided with a valve housing hole (4), and the valve rod (2) extends outside the valve housing (1) through the valve housing hole (4), wherein the valve rod (2) and the valve housing (1) are clearance-fitted in the valve housing hole (4).

10. A sliding valve assembly according to claim 1, characterized in that the valve housing (1) is detachably connected to the sliding valve seat (3);

one end, far away from the slide valve seat (3), of the valve sleeve (1) is provided with a sealing groove (9) along the circumferential direction.

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