Locking type check valve

Abstract

The invention belongs to the technical field of valves, and discloses a locking type check valve which comprises a valve body assembly, a valve clack, an elastic piece, a limiting rod, a first locking piece and a second locking piece, the limiting rod, the first locking piece and the second locking piece can form a locking structure of the locking type check valve, and the valve clack is locked by the elastic piece under the action of medium pressure. And when the valve clack reaches the full-open position, the first locking piece is switched to the locking position and is matched with the second locking piece, and the limiting rod and the valve clack are mechanically locked at the full-open position. At the moment, the valve clack does not need to overcome spring force and self gravity by means of medium pressure to maintain opening, so that dynamic obstruction of the valve clack to a medium can be eliminated, pressure loss is reduced, additional power consumption of a pump machine can be effectively reduced for a large-flow system, energy loss in long-term operation is reduced, the equipment operation cost is reduced, and the system energy efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more particularly to a lock-up check valve. Background Technology

[0002] Lift check valves are key devices for preventing backflow of media in pipelines and are widely used in pump outlet pipelines in industries such as power, petrochemicals, and water utilities. Current lift check valves consist of a valve body assembly, a valve disc, and a spring. The valve disc is located inside the valve body assembly, and the spring is positioned between the valve body assembly and the valve disc, allowing the valve disc to move axially up and down, switching between a closed and fully open position. When the media flows forward, the pressure of the media itself pushes open the valve disc, putting the check valve in the open state. When the media flows backward, the spring, the weight of the valve disc, and the backflow pressure cause the valve disc to press tightly against the valve seat, thus closing the check valve.

[0003] However, when a lift check valve is fully open, meaning the valve disc is in the fully open position, the valve disc still needs to rely on the medium pressure to overcome the spring force and its own weight to maintain the open position. At this time, the valve disc is always "suspended" in the center of the flow channel, becoming a dynamic obstacle in the medium flow, which can easily cause unnecessary pressure loss. For large flow systems, the energy consumption accumulated by this additional flow resistance is considerable, increasing the power consumption and operating cost of the pump.

[0004] Therefore, the above problems urgently need to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a locking check valve to avoid unnecessary pressure loss of the medium when the valve disc is fully open, thereby reducing the power consumption and operating cost of the pump.

[0006] To achieve this objective, the present invention adopts the following technical solution: A lock-up check valve includes a valve body assembly, a valve disc, and a resilient element. The valve disc is disposed inside the valve body assembly, and the resilient element is disposed between the valve body assembly and the valve disc, allowing the valve disc to move axially up and down, thereby switching between a closed position and a fully open position. The lock-up check valve also includes: A limiting rod passes through the valve body assembly along the axial direction, and one end is fixedly connected to the valve disc. A first locking element is movably disposed outside the valve body assembly so that it can switch between a locked position and an unlocked position; The second locking member is disposed on the limiting rod, and when the second locking member moves to a position opposite to the first locking member, the valve disc is in the fully open position; When the first locking member is in the locking position, it can cooperate with the second locking member to lock the limiting rod. When the first locking member is in the unlocked position, the second locking member separates from the first locking member to allow the limiting rod to move axially.

[0007] Preferably, the second locking element is an annular groove provided on the limiting rod; The first locking element is a baffle that is adapted to and engages with the annular groove.

[0008] Preferably, one end of the baffle is rotatably disposed on the valve body assembly, and the other end can be fixed to the valve body assembly by a locking member when it is in the locked position.

[0009] Preferably, the end of the limiting rod is provided with a locking part; the valve disc is provided with a locking groove that is adapted to and conforms to the locking part.

[0010] Preferably, the valve body assembly includes a valve body, a valve cover, and a guide sleeve. The valve body has an opening, the valve cover is disposed on the opening, and the guide sleeve is fixed to the bottom of the valve cover. The limiting rod is provided with a limiting part, and both the limiting part and the valve disc are slidably connected to the inner wall of the guide sleeve.

[0011] Preferably, the bottom of the valve cover is provided with a mounting groove that conforms to the shape of the limiting part, and when the valve disc is in the fully open position, a portion of the limiting part can be inserted into the mounting groove and fit against it.

[0012] Preferably, the limiting part is fitted to the end of the valve disc.

[0013] Preferably, the guide sleeve, the valve cover, the limiting part, and the limiting rod can form a cavity; The limiting rod has a first air passage inside, and one end of the first air passage is connected to the chamber. The valve disc is provided with a second air passage, one end of which is connected to the first air passage, and the other end is connected to the interior of the valve body.

[0014] Preferably, a dynamic sealing structure is provided between the limiting rod and the valve body assembly.

[0015] Preferably, the valve body assembly includes a first flow channel, a second flow channel, and a third flow channel connected in sequence, wherein the second flow channel extends along the axial direction; The interior of the second flow channel is provided with a valve seat that conforms to the shape of the valve disc.

[0016] The beneficial effects of this invention are: The lock-up check valve proposed in this invention comprises a limit rod, a first locking element, and a second locking element, which together form the locking structure of the lock-up check valve. Under the action of medium pressure, the valve disc can gradually switch from a blocked position to a fully open position. When the valve disc reaches the fully open position, the first locking element switches to the locked position and cooperates with the second locking element to mechanically lock the limit rod and valve disc in the fully open position. At this time, the valve disc no longer needs to rely on medium pressure to overcome spring force and its own weight to maintain opening, thereby eliminating the dynamic obstruction of the medium by the valve disc, reducing pressure loss, and for high-flow systems, effectively reducing the additional power consumption of the pump, reducing energy loss during long-term operation, thereby reducing equipment operating costs and improving system energy efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the valve disc in the locking check valve of the present invention in the blocking position; Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle; Figure 3 This is a schematic diagram of the valve disc in the fully open position of the locking check valve of the present invention; Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0018] In the picture: 1. Valve body assembly; 11. Valve body; 12. Valve cover; 121. Mounting groove; 13. Guide sleeve; 14. First flow channel; 15. Second flow channel; 16. Third flow channel; 17. Valve seat; 2. Valve disc; 21. Second air passage; 3. Elastic element; 4. Limiting rod; 41. Locking part; 42. Limiting part; 43. First air passage; 5. First locking element; 6. Second locking element; 7. Locking element; 8. Dynamic sealing structure. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] Please see Figures 1 to 4 The check valve includes a valve body assembly 1, a valve disc 2, and an elastic element 3. The valve disc 2 is located inside the valve body assembly 1, and the elastic element 3 is located between the valve body assembly 1 and the valve disc 2, allowing the valve disc 2 to move axially, thus switching between a closed position and a fully open position. When the medium flows forward, the pressure of the medium itself pushes open the valve disc 2, putting the check valve in the conducting state. When the medium flows backward, the spring, the weight of the valve disc 2, and the backflow pressure allow the valve disc 2 to press tightly against the valve seat 17, thus putting the check valve in the closed state. However, when the check valve is fully open, the valve disc 2 still needs to rely on the medium pressure to overcome the spring force and its own weight to maintain the open position. At this time, the valve disc 2 is always "suspended" in the center of the flow channel, becoming a dynamic obstacle in the medium flow, which can easily cause unnecessary pressure loss. For large flow systems, the energy consumption accumulated by this additional flow resistance is considerable, increasing the power consumption and operating cost of the pump.

[0024] Therefore, this embodiment aims to add a locking structure to the traditional lift check valve to lock the valve disc 2, so that the valve disc 2 can be locked in the fully open position to avoid unnecessary pressure loss of the medium and reduce the power consumption and operating cost of the pump.

[0025] Specifically, the check valve further includes a limiting rod 4, a first locking element 5, and a second locking element 6. The limiting rod 4 passes through the valve body assembly 1 axially, and one end is fixedly connected to the valve disc 2. The first locking element 5 is movably disposed outside the valve body assembly 1 so that it can switch between a locked position and an unlocked position. The second locking element 6 is disposed on the limiting rod 4, and when the second locking element 6 moves to a position opposite to the first locking element 5, the valve disc 2 is in a fully open position. When the first locking element 5 is in the locked position, it can cooperate with the second locking element 6 to lock the limiting rod 4. When the first locking element 5 is in the unlocked position, the second locking element 6 separates from the first locking element 5 to allow the limiting rod 4 to move up and down axially.

[0026] Understandably, the limiting rod 4, the first locking element 5, and the second locking element 6 constitute the locking structure of the lock-up check valve. Under the action of the medium pressure, the valve disc 2 can gradually switch from the blocked position to the fully open position. When the valve disc 2 reaches the fully open position, the first locking element 5 switches to the locked position and cooperates with the second locking element 6 to mechanically lock the limiting rod 4 and the valve disc 2 in the fully open position. At this time, the valve disc 2 no longer needs to rely on the medium pressure to overcome the spring force and its own weight to maintain the opening, thereby eliminating the dynamic obstruction of the medium by the valve disc 2 and reducing pressure loss. For high-flow systems (such as high-pressure raw material oil pump outlet, high-pressure water injection pump outlet, chemical reaction feed pump outlet, etc.), it can effectively reduce the additional power consumption of the pump and reduce energy loss during long-term operation, thereby reducing equipment operating costs and improving system energy efficiency.

[0027] Similarly, it is understandable that the locking structure can fix the dynamic valve disc 2 in the fully open position to avoid the occurrence of non-design conditions such as low flow or flow fluctuation during the operation of a large flow system, which would cause the valve disc 2 to experience high-frequency flutter. This can prevent unnecessary wear between the valve disc 2 and the valve seat 17 or the valve body assembly 1, and extend the service life of the check valve.

[0028] Preferably, the second locking element 6 is an annular groove disposed on the limiting rod 4; the first locking element 5 is a baffle that is adapted to and engages with the annular groove. It is understood that when the valve disc 2 gradually moves to the fully open position, the annular groove can rise together with the limiting rod 4. When the annular groove is positioned opposite the baffle, it indicates that the valve disc 2 has moved to the fully open position. Only one annular groove is provided, facilitating accurate judgment by operators as to whether the valve disc 2 is in the fully open position. This completely avoids damage caused by improper locking and effectively prevents misoperation during locking, avoiding dangerous conditions such as "unlocking under load" or "operating without locking," thus ensuring system safety.

[0029] One end of the baffle is rotatably mounted on the valve body assembly 1, while the other end is fixed to the valve body assembly 1 by a locking element 7 when it is in the locked position. It is understood that when the limit rod 4 needs to be locked, the baffle is rotated. When the baffle cuts into the annular groove, it forms a bidirectional axial limit on the limit rod 4. Subsequently, the locking element 7 keeps the baffle in the locked position. When the valve disc 2 needs to be switched to the blocking state, simply removing the baffle releases the constraint on the annular groove. The limit rod 4 and valve disc 2 smoothly fall to the blocking position under the action of the elastic element 3 and the backflow pressure. The operation logic is clear and the response is rapid.

[0030] Similarly, it is understandable that under the action of the locking member 7, the first locking member 5 can form a rigid connection with the valve body assembly 1 when it is in the locked position. When there are medium pressure fluctuations, mechanical vibrations or hydraulic impacts in the system, it can effectively prevent the baffle from accidentally loosening or falling out of the annular groove, ensuring the stability of the valve disc 2 when locked, and avoiding risks such as the valve disc 2 falling or the sudden increase in flow resistance caused by accidental unlocking.

[0031] In practical applications, when the pump in the system starts working, the medium pressure in the valve body assembly 1 continuously increases, and the valve disc 2 is gradually lifted. When the annular groove is positioned opposite the baffle, it indicates that the valve disc 2 is in the fully open position. The operator rotates the baffle to screw it into the annular groove and locks the baffle using the locking element 7, thus locking the valve disc 2 in the fully open position. This prevents the valve disc 2 from oscillating at high flow rates and impacting the valve seat 17, thereby significantly reducing wear and leakage risks and extending the service life of the check valve under harsh operating conditions. When the pump stops working, the operator releases the locking element 7 from the baffle, allowing the check valve to perform check valve operation. Specifically, when the downstream end of the system loses pressure, the valve disc 2 can switch from the fully open position to the blocking position under the action of the elastic element 3, preventing medium backflow and avoiding pump reversal and damage.

[0032] Among them, the locking component 7 is preferably a bolt in the prior art, which is simple and quick to operate and convenient for on-site personnel.

[0033] The end of the limiting rod 4 is provided with a locking part 41; the valve disc 2 is provided with a groove that conforms to the locking part 41. It can be understood that the locking part 41 and the groove can form a conformal fitting connection structure. Compared with the traditional threaded connection or welding method, this connection structure is not easy to loosen or produce gaps during long-term reciprocating lifting and lowering, ensuring that the limiting rod 4 and the valve disc 2 always maintain a precise linkage relationship, thereby ensuring that the operator can accurately judge the position of the valve disc 2.

[0034] The locking part 41 is preferably an annular protrusion extending radially, and the corresponding locking groove is an annular receiving groove. This arrangement can prevent the valve disc 2 from experiencing off-center load or local stress concentration during the lifting and lowering process and in the locked state.

[0035] In this embodiment, the valve body assembly 1 includes a valve body 11, a valve cover 12, and a guide sleeve 13. The valve body 11 has an opening, the valve cover 12 covers the opening, and the guide sleeve 13 is fixed to the bottom of the valve cover 12. The valve disc 2 includes a head and a sliding part. The sliding part is fitted inside the guide sleeve 13 and can slide against the inner wall of the guide sleeve 13. The elastic element 3 is preferably a compression spring as used in the prior art. Lugs are provided on the outer peripheral wall of the valve cover 12, and the two ends of the compression spring abut against the lugs and the head of the valve disc 2, respectively. Under the action of the guide sleeve 13 and the sliding part, the stability of the valve disc 2 during the lifting and lowering process can be ensured.

[0036] Furthermore, a limiting part 42 is provided on the limiting rod 4, and the limiting part 42 is also slidably connected to the inner wall of the guide sleeve 13. The cooperation between the limiting part 42 and the sliding part can form a double guide support structure for the valve disc 2 to move axially, effectively suppressing the radial sway and tilt of the valve disc 2 under non-design conditions such as low flow rate and flow fluctuation, and improving the service life of the check valve.

[0037] Preferably, the limiting part 42 fits into the end of the valve disc 2. This arrangement not only allows it to cooperate with the locking part 41 to form a connection structure that interlocks with the valve disc 2, improving the structural strength between the two, but also eliminates the axial gap between them, enhancing the bending stiffness and vibration resistance of the valve disc 2 and the limiting rod 4 during the lifting and lowering process. This further suppresses the radial sway and tilt of the valve disc 2 under non-design conditions such as low flow rate and flow fluctuation, and further improves the service life of the check valve.

[0038] Furthermore, the bottom of the valve cover 12 is provided with a mounting groove 121 that conforms to the shape of the limiting part 42. When the valve disc 2 is in the fully open position, part of the limiting part 42 can be inserted into the mounting groove 121 and fit against it. It can be understood that when the valve disc 2 is in the fully open position, the locking structure can provide axial support for the limiting rod 4, and the mounting groove 121 can apply radial constraint to the limiting part 42, so that the valve disc 2 achieves dual fixation of "mechanical locking + conformal fitting" in the fully open state, completely eliminating the high-frequency flutter phenomenon caused by flow fluctuation when the valve disc 2 is suspended in the flow channel, protecting the valve seat 17 and the guide sleeve 13 from repeated impacts of the valve disc 2, thereby avoiding internal leakage due to premature damage to the sealing surface and wear of the guide sleeve 13.

[0039] The guide sleeve 13, valve cover 12, limiting part 42, and limiting rod 4 can form a chamber. A first air passage 43 is provided inside the limiting rod 4, one end of which communicates with the chamber. A second air passage 21 is provided on the valve disc 2, one end of which communicates with the first air passage 43, and the other end communicates with the interior of the valve body 11. Understandably, the first air passage 43 and the second air passage 21 can maintain a dynamic balance between the air pressure inside the chamber and the internal pressure of the valve body 11. When the valve disc 2 is lifted, the damping effect caused by the accumulation of gas in the sealed chamber on the movement of the valve disc 2 is eliminated, ensuring that the valve disc 2 can overcome the spring force and its own weight with minimal medium pressure to reach the fully open position, reducing the minimum pressure difference required for opening. When the valve disc 2 is lowered, its back side (i.e., the chamber side) will not form a back pressure that hinders its descent due to gas compression, ensuring that the valve disc 2 can quickly and smoothly return to the sealing position, guaranteeing the sealing performance of the valve disc 2.

[0040] In this embodiment, the valve body assembly 1 includes a first flow channel 14, a second flow channel 15, and a third flow channel 16 connected sequentially. The second flow channel 15 extends axially. A valve seat 17, conforming to the shape of the valve disc 2, is disposed inside the second flow channel 15. It is understood that the axially arranged second flow channel 15 is aligned with the lifting direction of the valve disc 2, causing the force exerted by the medium on the valve disc 2 to be mainly concentrated axially. This reduces the radial unbalanced force experienced by the valve disc 2 during lifting and lowering, thus helping to maintain the stability of the valve disc 2 during movement.

[0041] In this embodiment, a dynamic sealing structure 8 is provided between the limiting rod 4 and the valve body assembly 1. The dynamic sealing structure 8 can prevent the leakage of the medium inside the valve body assembly 1 during the raising and lowering of the limiting rod 4.

[0042] The dynamic sealing structure 8 includes a guide and a seal. The guide is preferably a guide band, which reduces the friction coefficient between the limit rod 4 and the valve body assembly 1, improving the smoothness of the limit rod 4 during lifting and lowering. The seal is preferably an O-ring, lip seal, or packing seal, which prevents leakage of the medium inside the valve body assembly 1. Through the combined action of the seal and the guide, the dynamic sealing structure 8 achieves sealing while also providing guidance and lubrication, enhancing the safety, environmental friendliness, and compliance of the check valve under long-term continuous operation.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A locking check valve, comprising a valve body assembly (1), a valve disc (2), and an elastic element (3), wherein the valve disc (2) is disposed inside the valve body assembly (1), and the elastic element (3) is disposed between the valve body assembly (1) and the valve disc (2), so that the valve disc (2) can move axially, thereby switching between a blocking position and a fully open position, characterized in that, The lock-up check valve also includes: The limiting rod (4) passes through the valve body assembly (1) along the axial direction, and one end is fixedly connected to the valve disc (2); The first locking element (5) is movably disposed outside the valve body assembly (1) so that it can switch between a locked position and an unlocked position; The second locking member (6) is disposed on the limiting rod (4), and when the second locking member (6) moves to a position opposite to the first locking member (5), the valve disc (2) is in the fully open position; When the first locking member (5) is in the locking position, it can cooperate with the second locking member (6) to lock the limiting rod (4); When the first locking member (5) is in the unlocked position, the second locking member (6) separates from the first locking member (5) to allow the limiting rod (4) to move up and down axially.

2. The locking check valve according to claim 1, characterized in that, The second locking member (6) is an annular groove provided on the limiting rod (4); The first locking member (5) is a baffle that is adapted to and snapped into the annular groove.

3. The locking check valve according to claim 2, characterized in that, One end of the baffle is rotatably mounted on the valve body assembly (1), and the other end can be fixed to the valve body assembly (1) by a locking member (7) when it is in the locked position.

4. The locking check valve according to claim 1, characterized in that, The end of the limiting rod (4) is provided with a locking part (41); the valve disc (2) is provided with a locking groove that is adapted to and conforms to the locking part (41).

5. The locking check valve according to claim 1, characterized in that, The valve body assembly (1) includes a valve body (11), a valve cover (12), and a guide sleeve (13). The valve body (11) has an opening, the valve cover (12) covers the opening, and the guide sleeve (13) is fixed to the bottom of the valve cover (12). The limiting rod (4) is provided with a limiting part (42), and the limiting part (42) and the valve disc (2) are slidably connected to the inner wall of the guide sleeve (13).

6. The locking check valve according to claim 5, characterized in that, The bottom of the valve cover (12) is provided with a mounting groove (121) that conforms to the shape of the limiting part (42), and when the valve disc (2) is in the fully open position, part of the limiting part (42) can be inserted into the mounting groove (121) and fit against it.

7. The locking check valve according to claim 5, characterized in that, The limiting part (42) is attached to the end of the valve disc (2).

8. The locking check valve according to claim 5, characterized in that, The guide sleeve (13), the valve cover (12), the limiting part (42), and the limiting rod (4) can form a chamber; The limiting rod (4) has a first air passage (43) inside, and one end of the first air passage (43) is connected to the chamber; The valve disc (2) is provided with a second air passage (21), one end of which is connected to the first air passage (43), and the other end is connected to the interior of the valve body (11).

9. The locking check valve according to claim 1, characterized in that, A dynamic sealing structure (8) is provided between the limiting rod (4) and the valve body assembly (1).

10. The locking check valve according to claim 1, characterized in that, The valve body assembly (1) includes a first flow channel (14), a second flow channel (15) and a third flow channel (16) connected in sequence, wherein the second flow channel (15) extends along the axial direction; The interior of the second flow channel (15) is provided with a valve seat (17) that is adapted to and conforms to the shape of the valve disc (2).

Images