Check valve capable of being closed stably

Abstract

According to the technical scheme, the stable-closing check valve is characterized by comprising a valve body, a valve seat located in the valve body and a valve clack which is connected into the valve body in a rotating mode and can form hard sealing with the valve seat, and an inflow channel and an outflow channel which are located on the two sides of the valve seat respectively are arranged in the valve body. The inner wall of the outflow channel is provided with a groove close to the valve seat, the inner wall of the inflow channel is provided with a washing flow channel which bypasses the valve seat and is communicated with the groove, and the groove wall of the groove is elastically connected with a flow cutoff piece used for blocking the washing flow channel. One end of the cutoff piece extends into an inner cavity of the groove, the height of the end of the cutoff piece is larger than the height of a port, located in the wall of the groove, of the flushing flow channel, and a push block capable of moving into the groove and pushing the cutoff piece to the flushing flow channel is arranged on the edge of the valve clack. The push block abuts against the end, stretching into the groove, of the flow cutoff piece, and the flow cutoff piece blocks the washing flow channel. The problem that in the prior art, the valve clack and the valve seat cannot be fully closed, and medium backflow is caused is solved.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and more specifically to a check valve with stable closure. Background Technology

[0002] Check valves are a common type of valve in pipeline systems, mainly installed at the pump outlet. They are used to connect and disconnect fluid media in the pipeline system. Existing swing check valves mainly consist of a valve body, a valve seat, and a valve disc. The valve seat has a valve seat sealing surface and is fixed within the valve body flow channel. The valve disc has a valve disc sealing surface and is mounted in the valve body cavity using a pin. When the medium enters the valve body cavity from the valve inlet side, the medium pushes the valve disc to rotate around the pin to open the valve. When no medium enters the valve inlet side, the valve disc rotates around the pin to close the valve.

[0003] The existing check valve has a defect: there is a drop in the inner wall of the valve body at the valve seat, which forms a groove for impurities to accumulate. The impurities in the groove cannot be flushed away due to the direction of the medium flow. As a result, the impurities in the groove accumulate more and more, causing the lowest edge of the valve disc to touch the impurities. The valve disc sealing surface and the valve seat sealing surface cannot fully fit together, resulting in the medium flowing back. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a check valve that is easy to discharge impurities and can be fully closed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a check valve with stable closure, comprising a valve body, a valve seat positioned within the valve body, and a valve disc rotatably connected to the valve body and capable of forming a hard seal with the valve seat. The valve body is provided with an inflow channel and an outflow channel located on both sides of the valve seat. The inner wall of the outflow channel is provided with a groove adjacent to the valve seat. The inner wall of the inflow channel is provided with a flushing channel that bypasses the valve seat and communicates with the groove. A flow-blocking element for blocking the flushing channel is elastically connected to the groove wall of the groove. One end of the flow-blocking element extends into the inner cavity of the groove and its height is greater than the height of the port of the flushing channel located on the groove wall. A push block is provided at the edge of the valve disc, which can move into the groove and push the flow-blocking element towards the flushing channel. When the valve disc is in contact with the valve seat, the push block and the end of the flow-blocking element extending into the groove abut against each other, and the flow-blocking element blocks the flushing channel.

[0006] As a further improvement of this utility model, the flow interruptor includes a blocking part for blocking the scouring channel and confined within the groove wall, a force-receiving part that extends out of the groove and can contact the push block, and a stepped shaft disposed on the opposite side of the force-receiving part on the other end face of the blocking part. The larger diameter end of the stepped shaft is connected to the blocking part. A spring for pushing the blocking part into the groove is provided on the inner wall of the scouring channel. The spring is sleeved on the smaller diameter end of the stepped shaft, and the blocking part is misaligned with the scouring channel by the spring pushing the stepped shaft.

[0007] As a further improvement of this utility model, the blocking part is fitted with a sealing ring for preventing the medium from entering the flushing channel and the plane of the sealing part is perpendicular to the axis of the stepped shaft.

[0008] As a further improvement of this utility model, a sealing element is provided on the outer wall of the blocking part to prevent the medium from flowing back into the inflow channel and the plane of the sealing element is parallel to the plane of the stepped shaft.

[0009] As a further improvement of this utility model, the end face of the force-bearing part that penetrates into the groove is an arc surface.

[0010] The beneficial effects of this utility model are as follows: By pushing the flow-blocking component with the push block, the flow-blocking component is blocked from the flushing channel, thereby preventing the medium from flowing back into the inflow channel through the flushing channel. By separating the push block from the flow-blocking component, the spring pushes the flow-blocking component away from the flushing channel. The medium flows through the flushing channel and can flush the impurities in the groove. Compared with the prior art, this design can clean the impurities in the groove in a timely manner, ensure the smoothness of the push block entering the groove and the stability of the valve disc and valve seat being fully closed, and prevent the phenomenon of medium backflow. Attached Figure Description

[0011] Figure 1 This is a front sectional view of the present invention when it is closed;

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 for Figure 2 A three-dimensional schematic diagram of the combination of the valve body and the flow interruption component;

[0014] Figure 4 for Figure 3 A three-dimensional image after sectional cutting;

[0015] Figure 5 This is a front sectional view of the present invention when it is open;

[0016] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0017] Figure 7 for Figure 6 A three-dimensional schematic diagram of the combination of the valve body and the flow interruption component;

[0018] Figure 8 for Figure 7 A three-dimensional image after sectional cutting;

[0019] Figure 9 This is a three-dimensional schematic diagram of the valve body and the flow cut-off component when separated in this utility model.

[0020] Reference numerals: 1. Valve body; 2. Valve seat; 3. Valve disc; 4. Inflow channel; 5. Outflow channel; 6. Groove; 7. Flushing channel; 8. Flow interruptor; 81. Blocking part; 82. Force-bearing part; 83. Stepped shaft; 84. Sealing ring; 85. Sealing element; 9. Push block; 10. Spring. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0022] Reference Figures 1 to 9 As shown, a check valve with stable closure in this embodiment includes a valve body 1, a valve seat 2 positioned inside the valve body 1, and a valve disc 3 rotatably connected inside the valve body 1 and capable of forming a hard seal with the valve seat 2. The valve body 1 is provided with an inflow channel 4 and an outflow channel 5 located on both sides of the valve seat 2, and the inner wall of the outflow channel 5 is provided with a groove 6 adjacent to the valve seat 2.

[0023] Based on the aforementioned existing technology, a longitudinal hole is drilled to a certain depth at the lowest point of the inflow channel 4. Then, a transverse hole is machined along the length of the inflow channel 4 on the wall of the groove 6. The transverse hole communicates with the longitudinal hole to form a flushing channel 7. Next, a blocking groove with a height higher than the transverse hole is machined on the wall of the groove 6. The width of the blocking groove on the horizontal plane is greater than the width of the transverse hole. The blocking groove traverses the flushing channel 7, and its bottom is located on the inner wall of the flushing channel 7. The opening of the blocking groove on the wall of the groove 6 is countersunk. The flow element 8 includes a stepped shaft 83, a blocking part 81, and a force-receiving part 82, which are arranged sequentially along the length of the inflow channel 4. The larger diameter end of the stepped shaft 83 is connected to the blocking part 81. There are two stepped shafts 83, which are distributed along the width of the blocking groove. The width of the blocking part 81 matches the width of the blocking groove. The width of the force-receiving part 82 is smaller than the width of the blocking part 81. The distance between the two stepped shafts 83 is greater than or equal to the width of the flushing channel 7. Two spring grooves are opened on the bottom of the blocking groove. A pusher block 9 is welded on the peripheral wall of the valve disc 3.

[0024] During assembly, two springs 10 are respectively fitted onto the smaller diameter parts of the two stepped shafts 83. Then, the two springs 10 are respectively aligned with the two spring slots. The flow interruptor 8 is moved into the blocking slot until the two springs 10 are respectively inserted into the two spring slots. The blocking part 81 is located in the blocking slot, and the force-bearing part 82 is partially located in the blocking slot. Two cover plates are respectively placed on both sides of the force-bearing part 82 and positioned on the inner wall of the groove 6 by bolt connection. Then the blocking part 81 is limited to the blocking slot.

[0025] Initially, valve disc 3 and valve seat 2 are in contact to form a hard seal. There is no medium in the inflow channel 4. Push block 9 and force-bearing part 82 are in contact at one end in groove 6. Blocking part 81 is transversely cut in flushing channel 7, flushing channel 7 is in an open circuit state, and spring 10 is in a compressed state. As the inflow channel 4 is filled with medium and pushes valve disc 3 away from valve seat 2, push block 9 gradually moves out and away from groove 6. Spring 10 pushes flow cut-off part 8 to move into groove 6. Two stepped shafts 83 partially enter the space where flushing channel 7 intersects with blocking groove. The gap between the two stepped shafts 83 is connected to flushing channel 7 and the connected space gradually increases. Blocking part 81 gradually enters the part of blocking groove located between flushing channel 7 and groove 6. Force-bearing part 82 extends The length of the medium flowing into the groove 6 gradually increases. The medium flowing into the channel 4 passes through the flushing channel 7 and enters the groove 6. When the blocking part 81 touches the cover plate, the spring 10 cannot push the flow cut-off part 8 to move. The length of the force-bearing part 82 at the end of the groove 6 reaches its maximum. As the pressure of the medium flowing into the channel 4 decreases to zero, the valve disc 3 swings down, the push block 9 enters the groove 6 and touches the end of the force-bearing part 82. Then the push block 9 pushes the force-bearing part 82 so that the blocking part 81 gradually enters the space where the flushing channel 7 intersects with the blocking groove. The gap between the two stepped shafts 83 and the communication space between the flushing channel 7 gradually decreases to zero. The spring 10 is compressed and returns to its initial state. The valve disc 3 and the valve seat 2 fit tightly together, and the medium cannot flow back into the channel 4.

[0026] Compared with existing technologies, this design can promptly clean impurities in the groove 6, ensure the smoothness of the push block 9 entering the groove 6 and the stability of the valve disc 3 and valve seat 2 in fully closing, and prevent the phenomenon of medium backflow.

[0027] As one specific implementation method of the improvement, refer to Figure 9 As shown, a soft sealing ring 84 is fixedly sleeved on the outside of the blocking part 81. The sealing ring 84 can be made of rubber. The sealing ring 84 is always located in the part of the blocking groove between the flushing channel 7 and the groove 6. The plane where the sealing ring 84 is located is perpendicular to the axis of the stepped shaft 83 and fits against the groove wall of the blocking groove. This design can prevent the medium from flowing through the blocking groove and entering the inflow channel 4, thereby playing the role of preventing backflow.

[0028] As one specific implementation method of the improvement, refer to Figure 9 As shown, a soft sealing element 85 is fixedly attached to the upper surface edge of the blocking part 81. The two ends of the sealing element 85 can be bonded to the sealing ring 84. When the blocking part 81 is in the state of blocking the scouring channel 7, the sealing element 85 is attached to the groove wall at the highest point of the blocking groove. This design can prevent the medium from flowing into the inflow channel 4 by passing through the transverse hole, the gap between the blocking part 81 and the blocking groove and the longitudinal hole in sequence, thus preventing backflow.

[0029] As one specific implementation method of the improvement, refer to Figure 2 and Figure 9 As shown, the end face of the force-receiving part 82 that penetrates into the groove 6 is an arc surface. This design can reduce the friction and wear between the force-receiving part 82 and the push block 9, and improve the smoothness of the push block 9 pushing the force-receiving part 82.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A check valve with stable closure, comprising a valve body (1), a valve seat (2) positioned within the valve body (1), and a valve disc (3) rotatably connected within the valve body (1) and capable of forming a hard seal with the valve seat (2), wherein the valve body (1) is provided with an inflow channel (4) and an outflow channel (5) respectively located on both sides of the valve seat (2), and the inner wall of the outflow channel (5) is provided with a groove (6) adjacent to the valve seat (2), characterized in that: The inner wall of the inflow channel (4) is provided with a flushing channel (7) that bypasses the valve seat (2) and communicates with the groove (6). The groove wall of the groove (6) is elastically connected with a flow-blocking element (8) for blocking the flushing channel (7). One end of the flow-blocking element (8) extends into the inner cavity of the groove (6) and its height is greater than the height of the port of the flushing channel (7) located on the groove wall of the groove (6). The edge of the valve disc (3) is provided with a push block (9) that can move into the groove (6) and push the flow-blocking element (8) toward the flushing channel (7). When the valve disc (3) is in contact with the valve seat (2), the push block (9) and the end of the flow-blocking element (8) extending into the groove (6) touch each other and the flow-blocking element (8) blocks the flushing channel (7).

2. The check valve for stable closure according to claim 1, characterized in that: The flow interruptor (8) includes a blocking part (81) for blocking the flushing channel (7) and confined within the groove wall of the groove (6), a force-receiving part (82) that extends out of the groove (6) and can contact the push block (9), and a stepped shaft (83) disposed on the opposite side of the force-receiving part (82) on the other end face of the blocking part (81). The larger diameter end of the stepped shaft (83) is connected to the blocking part (81). A spring (10) is provided on the inner wall of the flushing channel (7) for pushing the blocking part (81) toward the groove (6). The spring (10) is sleeved on the smaller diameter end of the stepped shaft (83). The spring (10) pushes the stepped shaft (83) to make the blocking part (81) and the flushing channel (7) misaligned.

3. A check valve for stable closure according to claim 2, characterized in that: The blocking part (81) is fitted with a sealing ring (84) to prevent the medium from entering the flushing channel (7) and the plane of the ring is perpendicular to the axis of the stepped shaft (83).

4. A check valve with stable shut-off according to claim 2 or 3, characterized in that: The outer wall of the blocking part (81) is provided with a sealing element (85) for preventing the medium from flowing back into the inflow channel (4) and the plane of the sealing element is parallel to the plane of the stepped shaft (83).

5. A check valve with stable closure according to claim 2 or 3, characterized in that: The end face of the force-bearing part (82) that enters the groove (6) is an arc surface.

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