Check valve

Abstract

The invention discloses a check valve and relates to the technical field of valves, the check valve comprises a valve body, a fluid inlet end and a fluid outlet end, a valve clack is rotatably arranged in the valve body, the check valve further comprises a check assembly, and the check assembly comprises a check plate slidably arranged in the valve clack; when the pressure of the inlet end reaches a certain degree, the check plate synchronously swings along with the valve clack, the check plate does not stretch out of the valve clack in the process through limitation of the locking assembly, the check plate is released and contracted at different times, the problem that under the condition of low flow speed, the hysteresis phenomenon exists in return of the valve clack is solved, and the service life of the valve clack is prolonged. And the problem of medium backflow is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a check valve. Background Art

[0002] Check valves prevent backflow in fluid delivery systems by automatically shutting off the flow path through the opening and closing of the valve disc. In practical applications, check valves are often used to ensure unidirectional flow. The timely return of the valve disc is particularly important to prevent backflow, especially under low flow conditions. However, at low flow rates, the disc's return may be delayed due to insufficient kinetic energy, leading to backflow.

[0003] The common solution at present is to improve the closing performance by optimizing the valve disc structure or adding counterweights, but these methods may have a certain impact on the permeability of the medium and cannot completely solve the return hysteresis problem under low flow rate conditions.

[0004] For example, some check valves utilize a spring-assisted closing design. While this improves the disc's return performance to a certain extent, the spring may experience fatigue failure after long-term use, compromising valve reliability. Furthermore, existing designs often fail to fully consider the role of fluid dynamics in assisting the disc's closing action, limiting closing efficiency. For example, a ball valve for instrumentation with excellent sealing performance, documented in publication number CN211649134U, achieves excellent sealing performance through a complex elastic compensation structure. However, this solution fails to address the disc's return problem under low flow rate conditions.

[0005] Therefore, how to utilize fluid dynamic characteristics to improve the closing efficiency of the valve disc while ensuring the permeability of the medium has become a key issue in the design of check valves. Summary of the Invention

[0006] The object of the present invention is to provide a check valve to solve the technical problem in the background art mentioned above that the valve disc return action has a hysteresis phenomenon, which causes the medium to flow back.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a check valve comprising a valve body and a fluid inlet and outlet end within the valve body, a valve disc being rotatably disposed within the valve body, a check plate being slidably disposed within the valve disc, and the check plate being restricted from sliding by a locking assembly; The locking assembly includes a first slot provided on the valve disc and a second slot provided on the check plate, wherein a pin is slidably provided in the first slot and the pin can be inserted into the second slot to lock the check plate; When the pressure at the inlet end reaches a threshold, the check plate swings synchronously with the valve disc and the plug remains locked; when the fluid flows back, the check plate slides out of the valve disc to block the backflow, and at the same time the fluid pushes the valve disc back to its position, and the check plate is reset by the reset assembly.

[0008] Preferably, two guide grooves are defined in the valve disc, and the check plate is provided with two guide members capable of being inserted into the corresponding guide grooves.

[0009] Preferably, a groove is provided on the plug post, a sliding post is slidably provided in the valve flap, one end of the sliding post is hemispherical and can be inserted into the groove, and a first elastic member is provided between the other end and the valve flap.

[0010] Preferably, a connecting piece extending out of the valve disc is fixedly provided on the sliding column, and an arc-shaped piece in contact with the back surface of the valve disc is fixedly provided on the connecting piece.

[0011] Preferably, the reset assembly includes a clearance groove provided on the valve body, and a sliding member is slidably provided in the clearance groove.

[0012] Preferably, a reset member is provided for sliding in the valve body, the reset member is fixedly connected to the sliding member, a contact member capable of contacting the reset member is provided on one side of the check plate, the give way groove is connected to the entry end of the valve body through a connecting pipe, and a second elastic member is provided between the end of the sliding member away from the reset member and the valve body.

[0013] Preferably, the valve body is provided with a fluid channel, an end close to the valve disc is an inlet end, and an end away from the valve disc is a discharge end.

[0014] Preferably, a valve cover is connected to the valve body via a plurality of fixing bolts, and a sealing gasket is provided between the valve cover and the valve body.

[0015] Preferably, a connecting rod is fixedly provided on a side of the valve disc away from the inlet end of the valve body, and the connecting rod is fixedly connected to the valve body via a rotating shaft.

[0016] Preferably, a valve seat capable of contacting the valve disc is fixedly provided on the valve body, and a sealing member is provided at one end of the valve disc close to the valve seat.

[0017] The beneficial effects of the present invention are: By setting the check plate, when the fluid flow rate is low and the valve flap needs to be closed, the fluid impacts the check plate in the opposite direction and cooperates with the plug column, sliding column and other structures to achieve restriction and relaxation of the check plate, thereby controlling the timing of opening the check plate. Only when the fluid flows back and the valve flap needs to be closed, can the check plate be extended out of the valve flap, increasing the impact force of the fluid on the valve flap and the check plate, thereby accelerating the closing speed of the valve flap. Through the setting of the reset part and the second elastic part, the initial opening pressure of the swing check valve is set, and the valve flap can be closed slowly in the final stage, avoiding large noise and vibration when the valve flap is quickly closed in the final stage, preventing rapid collision between the valve flap and the valve body, resulting in rapid wear and damage of the valve seat and seals, and improving the service life of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the full-section front view structure of the present invention.

[0020] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0021] Figure 4 It is a structural schematic diagram of the valve disc of the present invention.

[0022] Figure 5 It is a structural cross-sectional view of the valve disc in the present invention.

[0023] Figure 6 It is a structural schematic diagram of the non-return plate and the guide member in the present invention.

[0024] Figure 7 It is an exploded view of the plug-in column and the sliding column in the present invention.

[0025] Figure 8 It is a schematic structural diagram of the contact member and the reset member in the present invention.

[0026] The accompanying drawings are marked as follows: 1. valve body; 2. valve disc; 3. check assembly; 301. check plate; 302. guide groove; 303. guide member; 4. locking assembly; 401. first slot; 402. second slot; 403. plug column; 404. groove; 405. sliding column; 406. first elastic member; 407. connecting member; 408. arc-shaped member; 5. reset assembly; 501. give way groove; 502. sliding member; 503. reset member; 504. contact member; 505. connecting pipe; 506. second elastic member. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] Example 1 Check valves prevent backflow in fluid delivery systems by automatically shutting off the flow path through the opening and closing of the valve disc 2. In practical applications, check valves are often used to ensure unidirectional fluid flow. The timely return of the valve disc 2 is particularly important to prevent backflow, especially under low flow conditions. However, at low flow rates, the disc's return may be delayed due to insufficient kinetic energy, leading to backflow.

[0029] The common solution at present is to improve the closing performance by optimizing the valve disc 2 structure or adding counterweights, but these methods may have a certain impact on the medium's permeability and cannot completely solve the return hysteresis problem under low flow rate conditions.

[0030] See also Figures 1 to 8 As shown, a check valve according to an embodiment of the present invention includes a valve body 1 and a fluid inlet end and a fluid outlet end. A valve disc 2 is rotatably provided in the valve body 1, and also includes a check assembly 3. The check assembly 3 includes a check plate 301 slidably provided in the valve disc 2. Two guide grooves 302 are defined in the valve disc 2. The check plate 301 is provided with two guide members 303 that can be inserted into the corresponding guide grooves 302. The valve body 1 is provided with a fluid channel. The end close to the valve disc 2 is the inlet end, and the end away from the valve disc 2 is the outlet end. A valve cover is connected to the valve body 1 by multiple fixing bolts. A sealing gasket is provided between the valve cover and the valve body 1. A connecting rod is fixedly provided on the side of the valve disc 2 away from the inlet end of the valve body 1. The connecting rod is fixedly connected to the valve body 1 by a rotating shaft. A valve seat that can contact the valve disc 2 is fixedly provided on the valve body 1. A sealing member is provided on the end of the valve disc 2 close to the valve seat. The valve body 1, valve seat, sealing member, connecting rod, sealing member, valve cover and fixing bolts in this device are all prior art and will not be described in detail here.

[0031] During specific use, when the fluid flows back from the discharge end, the fluid impacts the valve disc 2 and the check plate 301. At this time, the check plate 301 extends out of the valve disc 2, and because of the guide groove 302 and the guide member 303, it can ensure that the check plate 301 does not slide out of the valve disc 2, thereby increasing the contact area between the valve disc 2 and the check plate 301 and the fluid. Further, when the flow rate of the fluid is relatively low, the valve disc 2 can also be quickly closed to prevent the fluid from flowing back. In the process of the check plate 301 swinging toward the valve seat with the valve disc 2, the check plate 301 contacts the valve body 1, which can not only contact with the fluid to the greatest extent, increase the impact force of the fluid on the check plate 301 and the valve disc 2, speed up the closing speed, but also enable the check plate 301 to gradually reset.

[0032] The setting of the check plate 301 extends the effective length of the valve flap 2, which is equivalent to lengthening the lever arm (the distance from the fulcrum to the point of action) of the fluid force when the reverse fluid impacts. Under the same reverse impact force, the increase in the lever arm will significantly increase the closing torque, thereby accelerating the rotational closing of the valve flap 2.

[0033] By setting the check plate 301, when the fluid flow rate is low and the valve flap 2 needs to be closed, the fluid will impact the check plate 301 and the valve flap 2 in the opposite direction, thereby increasing the impact force of the fluid on the valve flap 2 and the check plate 301, thereby increasing the force of the fluid on the valve flap 2. Even in the case of a low flow rate, it can play the role of quickly closing the valve flap 2, and can make the seal of the valve flap 2 fit tightly against the valve seat, thereby playing the role of sealing to prevent the fluid from flowing back.

[0034] Example 2 Although the above solution can solve the problem of quickly closing the valve flap 2 when the fluid flow rate is low, in actual use, since the check plate 301 lacks a limit, after the fluid enters the fluid inlet end and impacts the valve flap 2, the check plate 301 will be directly extended from the valve flap 2, thereby increasing the burden on the valve flap 2 when it swings, reducing the swinging speed of the valve flap 2, and being detrimental to the smoothness of the fluid flow.

[0035] Based on the above embodiment 1, please refer to Figures 1 to 8As shown, the technical solution adopted includes a locking component 4. When the pressure at the inlet end reaches a certain level, the check plate 301 swings synchronously with the valve disc 2. The check plate 301 does not extend out of the valve disc 2 during this process due to the restriction of the locking component 4. The locking component 4 includes a first slot 401 opened on the valve disc 2 and a second slot 402 opened on the check plate 301. A plug 403 that can be inserted into the second slot 402 is slidably provided in the first slot 401. A groove 404 is provided on the plug 403. A plug that can be inserted into the second slot 402 is slidably provided in the valve disc 2. A sliding column 405 is inserted into the groove 404, and one end of the sliding column 405 inserted into the groove 404 is hemispherical. A first elastic member 406 is provided between the end of the sliding column 405 away from the groove 404 and the valve flap 2. A connecting member 407 extending out of the valve flap 2 is fixedly provided on the sliding column 405, and an arc-shaped member 408 in contact with the back of the valve flap 2 is fixedly provided on the connecting member 407. The position of the arc-shaped member 408 is set according to actual conditions and can be set at a lower position to respond quickly when the water level is low and close the valve flap 2.

[0036] During specific use, when the fluid enters the fluid channel from the inlet end, the fluid impacts the valve flap 2, causing the valve flap 2 to open. During the process of opening the valve flap 2, the plug post 403 is inserted into the second slot 402, and the sliding post 405 is inserted into the groove 404. The groove 404 is a spherical groove, thereby limiting the plug post 403, so that the plug post 403 limits the check plate 301 through the first slot 401 and the second slot 402, so that the check plate 301 swings synchronously with the valve flap 2, thereby preventing the problem of slow start-up of the valve flap 2 when the fluid enters the fluid channel.

[0037] When the valve flap 2 needs to be closed, the fluid impacts the back of the valve flap 2 in the opposite direction. The back of the valve flap 2 refers to the side away from the fluid inlet end. Then the fluid impacts the arc part 408. The arc part 408 drives the sliding column 405 to move away from the groove 404 through the connecting part 407, and the limit on the plug column 403 is released. The contact surface between the plug column 403 and the first slot 401 and the second slot 402 is set to be smooth, and the plug column 403 has a certain weight. After the limit on the plug column 403 is released, the plug column 403 moves out of the second slot 402, and the limit on the check plate 301 is released, or a spring or other elastic member is set between the plug column 403 and the valve flap 2 to make the plug column 403 quickly move out of the second slot 402, which is not shown in the figure.

[0038] An elastic member can be provided at the position where the check plate 301 contacts the valve flap 2, so that the check plate 301 can quickly extend out of the valve flap 2, which is not shown in the figure. After the check plate 301 moves out of the valve flap 2, the contact area between the fluid and the valve flap 2 and the check plate 301 is increased, thereby increasing the impact force of the fluid on the valve flap 2 and the check plate 301. Even when the flow rate of the fluid is low, the valve flap 2 can still be closed quickly.

[0039] By setting structures such as the plug column 403 and the sliding column 405, the check plate 301 can be restricted and relaxed, thereby controlling the timing of opening the check plate 301. Only when the fluid backflows and the valve flap 2 needs to be closed, the check plate 301 can be extended out of the valve flap 2, thereby increasing the impact force of the fluid on the valve flap 2 and the check plate 301, thereby accelerating the closing speed of the valve flap 2.

[0040] Example 3 In actual use, it was found that while relying solely on the locking assembly 4 can control the opening timing of the check plate 301, there is a certain degree of uncertainty when resetting the plunger 403. Specifically, when the fluid impacts the valve disc 2, the plunger 403 may not be inserted into the second slot 402 due to the check plate 301 not being fully reset or the fluid impact causing the valve disc 2 to open first. This may cause the check plate 301 to extend out of the valve disc 2 as it swings, slowing the opening speed of the valve disc 2 and affecting the fluid input and flow. Furthermore, the swing check valve has poor sealing performance at low pressures (e.g., loose sealing surfaces), requiring increased sealing force by increasing the deadweight of the valve disc 2 or adding a spring structure. In this case, the fluid must reach a certain pressure to overcome this additional resistance and push the valve disc 2 open. For example, in a water supply system, if the pipeline pressure fluctuates significantly, a minimum opening pressure must be set to prevent low-pressure leaks.

[0041] In order to solve the above technical problems, based on the above embodiments 1 and 2, please refer to Figures 1 to 8 As shown, the adopted technical solution includes a reset component 5, which includes a give way groove 501 opened on the valve body 1, a sliding member 502 is slidingly provided in the give way groove 501, and a reset member 503 is slidingly provided in the valve body 1, the reset member 503 is fixedly connected to the sliding member 502, and a contact member 504 that can contact the reset member 503 is provided on one side of the check plate 301, the give way groove 501 is connected with the entrance end of the valve body 1 through a connecting pipe 505, and a second elastic member 506 is provided between the end of the sliding member 502 away from the reset member 503 and the valve body 1. When the fluid in the fluid channel flows back, the check plate 301 slides out of the valve disc 2 to block the backflowing fluid, and at the same time the fluid pushes the valve disc 2 to return, and the check plate 301 is pushed back to its original position by the reset action of the reset component 5.

[0042] When in use, the plug 403 is not inserted into the second slot 402 before the fluid is input. When the fluid is input into the valve body 1 from the inlet end, the fluid impacts the valve disc 2 and the plug 403. Due to the shape setting of the reset member 503, the shape of the reset member 503 can refer to the figure in the specification. Figure 3 and Figure 8As shown, it can not only delay the resetting of the valve disc 2 so that the check plate 301 is completely reset, but also abut the contact member 504 when the fluid impacts so that the check plate 301 is always in the initial position, so that the first slot 401 and the second slot 402 are in a connected state.

[0043] When the fluid impacts the valve disc 2 and the plug post 403, the valve disc 2 cannot be opened due to the abutment of the reset member 503 against the contact member 504. When the fluid impacts the plug post 403, the plug is moved in the direction of the sliding post 405, so that the plug post 403 passes through the second slot 402 and pushes the sliding post 405 to move in the direction of the first elastic member 406. The first elastic member 406 is compressed, so that the plug post 403 limits the check plate 301. At the same time, a guide component is provided on the inner wall of the plug post 403 and the first slot 401, so that the plug post 403 does not deflect. After the plug post 403 moves to the limit position in the direction of the sliding post 405, the sliding post 405 is inserted into the groove 404 under the action of the first elastic member 406 to limit the plug post 403.

[0044] Subsequently, the fluid is discharged into the give way groove 501 through the connecting pipe 505, causing the sliding member 502 to move away from the contact member 504. The sliding member 502 drives the reset member 503 to move synchronously. The sliding member 502 causes the second elastic member 506 to contract, so that the reset member 503 no longer resists the contact member 504. As a result, the valve flap 2 is opened under the impact of the fluid without reducing the opening speed of the valve flap 2, so that the fluid flows smoothly.

[0045] When the fluid flows back and the valve disc 2 needs to be closed, the fluid impacts the arc member 408, and the arc member 408 slides on the back of the valve disc 2. At the same time, the arc member 408 drives the sliding post 405 to move through the connecting member 407. The first elastic member 406 is compressed, causing the sliding post 405 to move out of the groove 404 and no longer limit the plug post 403. Under the action of gravity, the plug post 403 moves out of the second slot 402, thereby releasing the restriction on the check plate 301, allowing the check plate 301 to extend out of the valve disc 2, thereby accelerating the closing speed of the valve disc 2. After the valve disc 2 drives the check plate 301 to swing toward the valve seat by a certain angle, the contact member 504 contacts the reset member 503, causing the check plate 301 to retract into the valve disc 2. After the check plate 301 completes its retraction, the contact member 504 begins to squeeze the reset member 503, causing the reset member 503 to retract through the sliding member 502, and the sliding member 502 causes the second elastic member 506 to retract.

[0046] By cooperating with the reset member 503 and the contact member 504, the valve flap 2 closes slowly in the final stage, avoiding the large noise and vibration generated when the valve flap 2 closes quickly in the final stage, and preventing the valve flap 2 from colliding with the valve body 1 quickly, which causes rapid wear and damage to the valve seat and seals, and sets the initial opening pressure of the swing check valve, thereby improving the service life of the valve body.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A check valve comprising a valve body (1) and a fluid inlet and outlet end, wherein a valve disc (2) is rotatably provided in the valve body (1), and characterized in that: A check plate (301) is provided for sliding inside the valve flap (2), and the check plate (301) is restricted from sliding by a locking assembly (4); The locking assembly (4) comprises a first slot (401) provided on the valve flap (2) and a second slot (402) on the check plate (301); a pin (403) is slidably provided in the first slot (401); the pin (403) can be inserted into the second slot (402) to lock the check plate (301); When the pressure at the inlet end reaches a threshold value, the check plate (301) swings synchronously with the valve disc (2) and the plug post (403) remains locked; when the fluid flows back, the check plate (301) slides out of the valve disc (2) to block the backflow, and at the same time, the fluid pushes the valve disc (2) back to its original position, and the check plate (301) is reset by the reset component (5).

2. A check valve according to claim 1, characterized in that: Two guide grooves (302) are provided in the valve flap (2), and two guide members (303) capable of being inserted into the corresponding guide grooves (302) are provided on the check plate (301).

3. A check valve according to claim 2, characterized in that: A groove (404) is provided on the plug post (403), and a sliding post (405) is slidably provided in the valve flap (2). One end of the sliding post (405) is hemispherical and can be inserted into the groove (404), and a first elastic member (406) is provided between the other end and the valve flap (2).

4. A check valve according to claim 3, characterized in that: A connecting piece (407) extending out of the valve flap (2) is fixedly provided on the sliding column (405), and an arc-shaped piece (408) in contact with the back surface of the valve flap (2) is fixedly provided on the connecting piece (407).

5. A check valve according to claim 4, characterized in that: The reset assembly (5) comprises a clearance groove (501) provided on the valve body (1), and a sliding member (502) is slidably provided in the clearance groove (501).

6. A check valve according to claim 5, characterized in that: A reset member (503) is provided in a sliding manner in the valve body (1), and the reset member (503) is fixedly connected to the sliding member (502). A contact member (504) capable of contacting the reset member (503) is provided on one side of the check plate (301). The clearance groove (501) is connected to the inlet end of the valve body (1) through a connecting pipe (505). A second elastic member (506) is provided between the end of the sliding member (502) away from the reset member (503) and the valve body (1).

7. A check valve according to claim 6, characterized in that: The valve body (1) is provided with a fluid channel, wherein the end close to the valve disc (2) is an inlet end, and the end away from the valve disc (2) is a discharge end.

8. A check valve according to claim 7, characterized in that: The valve body (1) is connected to a valve cover via a plurality of fixing bolts, and a sealing gasket is provided between the valve cover and the valve body (1).

9. A check valve according to claim 8, characterized in that: A connecting rod is fixedly provided on a side of the valve flap (2) away from the inlet end of the valve body (1), and the connecting rod is fixedly connected to the valve body (1) via a rotating shaft.

10. A check valve according to claim 9, characterized in that: A valve seat capable of contacting the valve flap (2) is fixedly provided on the valve body (1), and a sealing member is provided at one end of the valve flap (2) close to the valve seat.

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