Anti-failure structure of reversing valve

Abstract

The utility model provides an anti-failure structure of a reversing valve, and belongs to the technical field of reversing valves. The problem that an existing reversing valve has a balance point, so that reversing is unstable is solved. The reversing valve comprises a valve body, a reversing rod and a reset spring, the reversing rod and the reset spring are arranged in the valve body, a reversing cavity and a reversing hole communicated with the reversing cavity are formed in the valve body, the reset spring and the reversing cavity are located at the two ends of the reversing rod respectively, the two ends of the reset spring act on the valve body and the reversing rod respectively, and the reversing rod is sleeved with a sealing ring. The sealing ring abuts against the cavity wall of the reversing cavity to form sealing, the failure prevention structure comprises at least one ventilation groove formed in the cavity wall of the reversing cavity in a concave mode and at least one ventilation channel located in the valve body, the ventilation channel is communicated with the reversing cavity and the outside, and when the sealing ring moves to the ventilation groove, the reversing hole can be communicated with the ventilation channel through the ventilation groove. The anti-failure structure of the reversing valve has the advantage that the reversing of the reversing valve is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of reversing valves and relates to a reversing valve failure prevention structure. Background Art

[0002] A gas reversing valve, also known as a pneumatic reversing valve or a pneumatically controlled reversing valve, is a valve used in pneumatic control systems that can change the direction of gas flow as needed. This valve usually consists of one or more internal channels that can be opened or closed by a moving valve core or slide valve to direct the gas flow to different outlets.

[0003] Existing reversing valves, for example, Chinese patent literature discloses an air-controlled reversing valve with a cut-off function [patent number: 201420394133.7; authorization announcement number: CN 204004561U], which includes a tightly connected air-controlled reversing valve and a stop valve, the stop valve includes: a stop valve body, a stop valve stem, a return spring, two sealing rings and a stop push rod, the stop valve body is provided with a main air inlet, a push rod port and an air-controlled air outlet, the three are gathered in the valve stem accommodating space, and the air outlet end of the air-controlled air outlet is connected to the reversing air inlet; the stop valve stem is placed in the valve stem accommodating space, and a spring groove is provided at one end facing the air-controlled air outlet; one end of the return spring is inserted in the spring groove, and the other end is connected to the stepped portion of the air-controlled air outlet; two sealing rings are sleeved on the stop valve stem to form an airtight seal; the stop push rod is inserted in the push rod port, one end is outside the push rod port, and the other end is connected to the stop valve stem.

[0004] In the reversing valve of this structure, the two ends of the reset spring act on the valve body and the reversing valve stem respectively, and the gas acts on the reversing valve stem through the reversing control port. The reset spring and the reversing control port cooperate to realize the reciprocating movement of the reversing valve stem, thereby realizing the reversing of the reversing valve. However, in actual use, there is a situation where the elastic force of the reset spring and the pressure of the gas entering through the reversing control port are the same, that is, there is a balance point, which makes the reversing valve stem positioned, so that the reversing cannot be realized, resulting in the problem that the reversing of the reversing valve is not stable enough. Summary of the invention

[0005] The utility model aims to solve the above problems existing in the prior art and proposes a directional control valve failure prevention structure, which solves the technical problem of how to stabilize the switching of the directional control valve.

[0006] The objectives of the utility model can be achieved through the following technical solutions: a reversing valve anti-failure structure, the reversing valve comprises a valve body, a reversing rod and a reset spring arranged in the valve body, the valve body has a reversing cavity and a reversing hole connected to the reversing cavity, the reset spring and the reversing cavity are respectively located at two ends of the reversing rod, the two ends of the reset spring act on the valve body and the reversing rod respectively, the reversing rod is sleeved with a sealing ring, the sealing ring abuts against the cavity wall of the reversing cavity to form a seal, and is characterized in that the anti-failure structure comprises at least one ventilation groove recessed in the cavity wall of the reversing cavity and at least one air channel located in the valve body, the air channel connects the reversing cavity and the outside world, and when the sealing ring moves to the ventilation groove, the reversing hole can be connected to the air channel through the ventilation groove.

[0007] During operation, the gas enters the reversing cavity through the reversing hole, overcomes the elastic force of the reset spring and pushes the reversing rod to move, realizing the reversing of the reversing valve. Then the reset spring resets and pushes the reversing rod to move in the opposite direction, realizing the reversing of the reversing valve again, and so on, realizing the reversing function of the reversing valve. According to the balance point position of the reversing rod measured in actual use due to the same force on both sides, the ventilation groove is opened at the balance point. When the reversing rod moves to the balance point, the sealing ring just moves to the ventilation groove at this time, and there is a gap between the sealing ring and the bottom of the ventilation groove, that is, the sealing ring fails at this time, so that the reversing hole is connected to the outside world through the reversing cavity, the ventilation groove, the reversing cavity and the airway, and the gas in the reversing cavity is depressurized to break the balance, thereby solving the problem that the reversing rod cannot move at the balance point, so that the reversing valve can always be reversed and the reversing of the reversing valve is stable.

[0008] In the above-mentioned reversing valve failure prevention structure, the valve body includes a main body and an end cover, the end cover is fixedly connected to the end of the main body, the air passage is located in the end surface of the end cover facing the main body, and the reversing hole and the reversing cavity are both located in the end cover. The main body and the end cover are split, and this structure makes the air passage, the reversing hole and the reversing cavity easy to process.

[0009] In the above-mentioned anti-failure structure of the reversing valve, the reversing hole and the reversing rod are arranged on the same central axis, the cavity wall of the reversing cavity has a pair of convex strips arranged in an arc shape, the pair of convex strips and the reversing hole are arranged concentrically, and there is a connecting groove between the two ends of the pair of convex strips. When the reversing rod abuts against the convex strips, the reversing hole can be connected to the reversing cavity through the connecting groove. The setting of the convex strips prevents the end face of the reversing rod from completely fitting with the cavity wall, and the setting of the connecting groove makes the reversing hole always connected with the reversing cavity, preventing the problem of the reversing rod being stuck, and making the reversing of the reversing valve stable.

[0010] In the above-mentioned reversing valve failure prevention structure, the number of the ventilation grooves is 1-6, and the number of the ventilation channels is 1-6. When the number of the ventilation grooves and the ventilation channels is not less than two, all the ventilation grooves are arranged at equal intervals, and all the ventilation channels are arranged at equal intervals. In actual use, only one ventilation groove and ventilation channel are needed, and multiple settings can ensure stability.

[0011] In the above-mentioned reversing valve anti-failure structure, the depth of the ventilation groove is between 0.2-1 mm.

[0012] In the above-mentioned reversing valve failure prevention structure, the ventilation groove is in the shape of an elongated strip along the axial direction of the reversing rod.

[0013] In the above-mentioned reversing valve anti-failure structure, both ends of the ventilation groove are semicircular.

[0014] Compared with the prior art, the anti-failure structure of the reversing valve provided by the utility model has the following advantages:

[0015] 1. This anti-failure structure is provided with ventilation grooves and ventilation channels, so that when the reversing rod is located at the balance point, the reversing hole is connected with the outside through the reversing cavity, ventilation grooves, reversing cavity and ventilation channels, and the gas in the reversing cavity is depressurized to break the balance, thereby solving the problem that the reversing rod cannot move at the balance point, so that the reversing valve can always be reversed and the reversing of the reversing valve is stable.

[0016] 2. The reversing valve has a pair of protruding and spaced convex strips on the wall of the reversing cavity, and the reversing hole is always connected with the reversing cavity through the connecting groove, so as to prevent the reversing rod from getting stuck and make the reversing of the reversing valve stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall structural state diagram of the reversing valve when it is at the balance point.

[0018] Figure 2 This is the reversing valve Figure 1 Magnified image of area A.

[0019] Figure 3 It is a schematic diagram of the overall structure of the anti-failure structure of the reversing valve.

[0020] Figure 4 This is the state diagram when the sealing ring of the reversing valve is located at the leftmost end of the reversing chamber.

[0021] Figure 5 This is a state diagram when the sealing ring of the reversing valve is located at the rightmost end of the reversing chamber.

[0022] In the figure, 1, valve body; 11, main body; 12, end cover; 2, reversing rod; 3, return spring; 4, reversing chamber; 5, reversing hole; 6, sealing ring; 7, ventilation groove; 8, ventilation channel; 9, convex strip; 10, connecting groove. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 As shown, the reversing valve includes a valve body 1, a reversing rod 2, a return spring 3 and an anti-failure structure, and the anti-failure structure includes a reversing cavity 4, a reversing hole 5, a sealing ring 6, a vent groove 7, a vent channel 8, a convex strip 9 and a connecting groove 10.

[0025] The reversing rod 2 and the return spring 3 are both arranged in the valve body 1. The valve body 1 includes a main body 11 and an end cover 12. The end cover 12 is fixedly connected to the end of the main body 11. The air passage 8 is located in the end surface of the end cover 12 facing the main body 11. The reversing hole 5 and the reversing cavity 4 are both located in the end cover 12. Figure 2 As shown, the reversing hole 5 is connected to the reversing cavity 4, and the air passage 8 is connected to the reversing cavity 4 and the outside. The reset spring 3 and the reversing cavity 4 are respectively located at the two ends of the reversing rod 2, and the two ends of the reset spring 3 act on the valve body 1 and the reversing rod 2 respectively. The reversing rod 2 is sleeved with a sealing ring 6, which abuts against the cavity wall of the reversing cavity 4 to form a seal.

[0026] like Figure 3 As shown, the vent groove 7 is recessed in the wall of the reversing cavity 4, and the vent groove 7 is in the shape of an elongated strip along the axial direction of the reversing rod 2, and the two ends of the vent groove 7 are semicircular. In this embodiment, the depth of the vent groove 7 is 0.5 mm. In actual production, the depth of the vent groove 7 can be 0.2 mm or 1 mm. In this embodiment, the number of the vent grooves 7 and the number of the air passages 8 are both two, and the two vent grooves 7 are arranged at equal intervals, and the two air passages 8 are arranged at equal intervals. In actual production, the number of the vent grooves 7 and the number of the air passages 8 can both be one or six.

[0027] The reversing hole 5 and the reversing rod 2 are arranged on the same central axis, and a pair of arc-shaped convex strips 9 are provided on the cavity wall of the reversing cavity 4. The pair of convex strips 9 and the reversing hole 5 are arranged concentrically, and a connecting groove 10 is provided between the two ends of the pair of convex strips 9. When the reversing rod 2 abuts against the convex strips 9, the reversing hole 5 can be connected with the reversing cavity 4 through the connecting groove 10.

[0028] When working, Figure 4 , Figure 5As shown, the gas enters the reversing cavity 4 through the reversing hole 5, overcomes the elastic force of the reset spring 3 and pushes the reversing rod 2 to move, realizing the reversing of the reversing valve. Then the reset spring 3 is reset, pushing the reversing rod 2 to move in the opposite direction, realizing the reversing of the reversing valve again, and so on, realizing the reversing function of the reversing valve. When the sealing ring 6 moves to the vent groove 7, the reversing hole 5 can be connected to the outside world through the reversing cavity 4, the vent groove 7, the reversing cavity 4 and the vent 8, and the reversing cavity 4 is depressurized to ensure that the reversing valve can achieve reversing.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0030] Although the terms valve body 1, main body 11, end cover 12, reversing rod 2, return spring 3, reversing chamber 4, reversing hole 5, sealing ring 6, vent groove 7, vent passage 8, convex strip 9, connecting groove 10 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A reversing valve failure prevention structure, the reversing valve comprising a valve body (1), a reversing rod (2) and a reset spring (3) arranged in the valve body (1), the valve body (1) having a reversing cavity (4) and a reversing hole (5) connected to the reversing cavity (4), the reset spring (3) and the reversing cavity (4) being respectively located at two ends of the reversing rod (2), the two ends of the reset spring (3) acting on the valve body (1) and the reversing rod (2) respectively, the reversing rod (2) being sleeved with a sealing ring (6), the sealing ring (6) being pressed against the cavity wall of the reversing cavity (4) to form a seal, characterized in that: The anti-failure structure comprises at least one ventilation groove (7) recessed in the wall of the reversing cavity (4) and at least one ventilation channel (8) located in the valve body (1); the ventilation channel (8) connects the reversing cavity (4) and the outside world; when the sealing ring (6) moves to the ventilation groove (7), the reversing hole (5) can be connected to the ventilation channel (8) through the ventilation groove (7).

2. A reversing valve failure prevention structure according to claim 1, characterized in that: The valve body (1) comprises a main body (11) and an end cover (12); the end cover (12) is fitted and fixedly connected to the end of the main body (11); the air passage (8) is located in the end surface of the end cover (12) facing the main body (11); and the reversing hole (5) and the reversing cavity (4) are both located in the end cover (12).

3. A reversing valve failure prevention structure according to claim 1, characterized in that: The reversing hole (5) and the reversing rod (2) are arranged on the same central axis; a pair of arc-shaped protruding strips (9) are provided on the cavity wall of the reversing cavity (4); the pair of protruding strips (9) and the reversing hole (5) are arranged on the same central axis; a connecting groove (10) is provided between the two ends of the pair of protruding strips (9); when the reversing rod (2) abuts against the protruding strips (9), the reversing hole (5) can be connected with the reversing cavity (4) through the connecting groove (10).

4. A reversing valve failure prevention structure according to claim 1, 2 or 3, characterized in that: The number of the ventilation grooves (7) is 1-6, and the number of the ventilation channels (8) is 1-6. When the number of the ventilation grooves (7) and the ventilation channels (8) is not less than two, all the ventilation grooves (7) are arranged at equal intervals, and all the ventilation channels (8) are arranged at equal intervals.

5. A reversing valve failure prevention structure according to claim 1, 2 or 3, characterized in that: The depth of the ventilation groove (7) is between 0.2-1 mm.

6. A reversing valve failure prevention structure according to claim 1, 2 or 3, characterized in that: The ventilation groove (7) is in the shape of an elongated strip along the axial direction of the reversing rod (2).

7. A reversing valve failure prevention structure according to claim 1, 2 or 3, characterized in that: Both ends of the ventilation groove (7) are semicircular.

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