Wafer type check valve

Abstract

The invention relates to the technical field of fluid control, and particularly discloses a wafer type check valve which comprises a valve body, a water flow channel is formed in the valve body, a first supporting shaft fixed to the inner wall of the valve body is arranged in the water flow channel through the center, and the first supporting shaft is close to a water flow inlet; two mounting grooves are symmetrically formed in the end face of the side, close to the first supporting shaft, of the valve body along the central axis of the valve body, a sealing assembly is jointly arranged in the two mounting grooves, and the sealing assembly is closer to the side, close to a water inlet, of the first supporting shaft. Two valve plates forming sealing with the first water flow channel are arranged between the sealing assembly and the first supporting shaft, the sealing assembly comprises an arc-shaped sealing plate jointly fixed in the two mounting grooves, and two arc-shaped sliding plates consistent with the sealing plate in curvature are slidably connected to the inner wall of the sealing plate. The double-clip check valve is used for solving the problem that an existing double-clip check valve cannot adjust the opening and closing sensitivity of a water flow channel.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more particularly to a wafer-type check valve. Background Technology

[0002] In various fluid transport systems, check valves play an irreplaceable role as a key valve device. Their main function is to ensure that fluid flows in only one direction. When backflow occurs, the check valve quickly and automatically closes, effectively preventing backflow and avoiding a series of problems caused by backflow, such as equipment damage, system failures, and process disruptions, thus ensuring the stable and safe operation of the entire fluid transport system.

[0003] Currently, there are many types of check valves on the market. Classified by structure, they mainly include lift check valves, swing check valves, and butterfly check valves. Lift check valves typically rely on the rise and fall of the valve disc to open and close. Their structure is relatively simple, but they have higher fluid resistance and strict requirements on installation direction, generally only allowing horizontal installation. Swing check valves, on the other hand, use the rotation of the valve disc around a pin outside the valve seat to complete the opening and closing process. They have lower fluid resistance and are more flexible in installation direction, allowing for horizontal or vertical installation. However, during long-term use, the sealing performance between the valve disc and the valve seat is easily affected by water erosion and impurity deposition, leading to a decrease in sealing effectiveness. Butterfly check valves use the rotation of a butterfly plate to control the flow of fluid. They have advantages such as compact structure and light weight; however, their sealing performance and pressure resistance are relatively limited, restricting their application in some situations with high sealing and pressure resistance requirements.

[0004] Furthermore, existing check valves still have many shortcomings in terms of dynamic sealing performance. During the dynamic process of valve plate opening and closing, the relative movement between the valve plate and the valve body can easily create gaps at the contact points, leading to fluid leakage. This not only wastes energy but may also affect the normal operation of the system. Moreover, some check valves lack effective valve plate opening angle limiting devices. When subjected to large water flow impacts, the valve plate may rotate excessively and collide with the valve body or other components, causing damage to the valve plate, shortening the valve's service life, and increasing maintenance costs. At the same time, the means of monitoring and adjusting the operating status of check valves are also relatively scarce. It is difficult to grasp the stress on the valve plate in real time and to adjust the valve's opening and closing sensitivity in a timely manner according to actual operating conditions, thus affecting the performance and reliability of the check valve.

[0005] Therefore, a wafer-type check valve is proposed to solve the problem that existing wafer-type check valves cannot adjust the sensitivity of the water flow channel opening and closing. Summary of the Invention

[0006] The purpose of this invention is to provide a wafer-type check valve to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A wafer-type check valve includes a valve body, a water flow channel is provided in the valve body, and a support shaft is provided at the center of the water flow channel and fixed to the inner wall of the valve body. The support shaft is located near the water inlet. Two mounting slots are symmetrically opened on the end face of the valve body near the support shaft one along the central axis of the valve body. A sealing component is provided in both mounting slots. The sealing component is closer to the water inlet side than the support shaft one. Two valve plates, which form a seal with the water flow channel, are provided between the sealing assembly and the support shaft. The sealing assembly includes an arc-shaped sealing plate that is fixed together with the two mounting slots. Two arc-shaped sliding plates with the same curvature as the sealing plate are slidably connected to the inner wall of the sealing plate. The two sliding plates are respectively fixed to the end face of the valve plate. Side plates, which are fixed to the valve body, are respectively fixed at both edges of the sealing plate, and the two side plates are symmetrically arranged along the central axis of the valve body; a second support shaft is fixedly connected between the two side plates, and the second support shaft is arranged parallel to the first support shaft; two connecting blocks are fixed to the outer wall of the second support shaft, and both connecting blocks are connected to an arc-shaped limiting structure fixed to the valve plate; A third support shaft is provided on the side of the first support shaft away from the water inlet, and both ends of the third support shaft are also fixedly connected to the inner wall of the valve body. Two springs are sleeved on the outer side of the support shaft, and the two springs correspond to the two valve plates respectively; one end of the spring is hooked to the support shaft through a bending structure, and the other end abuts against the bottom of the valve plate; The centers of the sealing plate, sliding plate, and limiting structure all coincide with the axis of the support shaft.

[0008] Preferably, the two sliding plates are arranged longitudinally and distributed sequentially. The sliding plate closer to the sealing plate is slidably connected to the inner wall of the sealing plate, and the other sliding plate is slidably connected to the sealing plate through a sealing strip. The sealing strip is fixed at the end of the sealing plate near the valve plate.

[0009] Preferably, the limiting structure includes an arc-shaped plate with the same curvature as the sliding plate. The arc-shaped plate has an arc-shaped groove with the same curvature as itself through its center. The arc-shaped groove is adapted to the outer diameter of the second support shaft. The arc-shaped plate is slidably sleeved on the second support shaft through the arc-shaped groove.

[0010] Preferably, one end of the arc-shaped plate is fixedly connected to the end face of the valve plate, and a cylinder is fixed in the arc-shaped groove at the end of the arc-shaped plate away from the valve plate. The output end of the cylinder faces the second support shaft and is fixedly connected to the connecting block through the second spring.

[0011] Preferably, a fastening structure is provided between the valve plate and the first support shaft. The fastening structure includes a rotating end and a fixed end. The rotating end is rotatably connected to the first support shaft, and the fixed end is fixedly connected to the valve plate. The valve plate rotates around the first support shaft through the fastening structure.

[0012] Preferably, a detection groove is provided on the side of the valve plate near the spring, and a force sensor is installed in the detection groove to detect the impact force borne by the valve plate on the side near the spring.

[0013] Preferably, the sealing plate and the side plate are integrally formed, and the side plate is fixedly connected to the water inlet end face of the valve body by bolts.

[0014] Preferably, the first support shaft and the second support shaft are located in the same horizontal plane, and the spring is in a compressed state.

[0015] Preferably, the two valve plates are arranged symmetrically, and after being spliced ​​together, they can completely cover the cross-section of the water flow channel, and the edge contour of the valve plate is adapted to the inner wall of the water flow channel.

[0016] Preferably, the curvature of the mounting groove is adapted to the arc-shaped structure of the sealing assembly.

[0017] The beneficial effects of this invention are as follows: By setting a sealing assembly, including an arc-shaped sealing plate and an arc-shaped sliding plate, with the sliding plate fixed to the valve plate and moving synchronously with it, dynamic sealing is achieved during the opening and closing of the valve plate. In a preferred embodiment, a sealing strip is further used to seal the gap between the sliding plate and the sealing plate, effectively preventing water from entering the water flow channel through the gap between the valve plate and the sealing plate when the valve plate rotates, ensuring reliable sealing of the check valve under various operating conditions, and avoiding media leakage. The centers of the sealing plate, sliding plate, and limiting structure all coincide with the axis of the first support shaft, so that the valve plate, sliding plate, and limiting structure all move in an arc around the axis of the first support shaft, avoiding motion interference. At the same time, it ensures that the sliding plate is always in close contact with the sealing plate, further improving the stability and reliability of the valve plate rotation. An adjustment device consisting of a cylinder and a second spring is provided. When the force sensor detects that the valve plate fails to close under the specified impact force, the effective length of the second adjusting spring can be changed by activating the cylinder, thereby changing its elastic force on the valve plate. The elastic force of the second adjusting spring is increased on the basis of the elastic force of the first spring, ensuring the sensitivity of the valve plate in opening and closing the water flow channel, and further improving the reliability and adaptability of the check valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the detection slot position according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the position of the sealing assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the valve body structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 6 This is a schematic diagram of the valve plate under stress according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the fastening structure according to an embodiment of the present invention.

[0019] In the diagram: 1. Valve body; 101. Water flow channel; 102. Support shaft one; 103. Mounting groove; 104. Valve plate; 105. Support shaft three; 106. Spring one; 107. Detection groove; 2. Sealing assembly; 201. Sealing plate; 202. Sliding plate; 203. Side plate; 204. Support shaft two; 2041. Connecting block; 3. Limiting structure; 301. Arc plate; 3011. Arc groove; 302. Cylinder; 303. Spring two; 4. Fastening structure; 401. Rotating end; 402. Fixed end. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Specifically, refer to Figures 1-7 A type of wafer check valve includes a valve body 1, wherein a cylindrical water flow channel 101 is provided inside the valve body 1 along the central axis for water flow. The water flow channel 101 has a centrally located support shaft 102 fixed to the inner wall of the valve body 1, with the support shaft 102 located near the water inlet.

[0022] Two mounting grooves 103 are symmetrically opened on one end face of the valve body 1 near the support shaft 102, along the central axis of the valve body 1. The curvature of the two mounting grooves 103 is adapted to the arc-shaped structure of the subsequent sealing assembly 2. A sealing component 2 is provided in both mounting slots 103. The sealing component 2 is closer to the water inlet side than the support shaft 102 and is used to achieve sealing when the valve plate 104 is opened.

[0023] Two symmetrically arranged valve plates 104 are provided between the sealing assembly 2 and the support shaft 102. After the two valve plates 104 are spliced ​​together, they can completely cover the cross-section of the water flow channel 101 and form a sealing fit with the water flow channel 101 to block the water flow. The edge contour of the valve plate 104 is adapted to the inner wall of the water flow channel 101 to ensure the sealing effect when closed.

[0024] The sealing assembly 2 includes an arc-shaped sealing plate 201 that is fixed together with the two mounting grooves 103. The inner wall of the sealing plate 201 is slidably connected to two arc-shaped sliding plates 202 with the same curvature as the sealing plate 201.

[0025] The two sliding plates 202 are respectively fixed to the end face of the valve plate 104; they move synchronously with the valve plate 104, and through the sliding cooperation between the sliding plates 202 and the sealing plate 201, dynamic sealing is achieved during the opening and closing process of the valve plate 104.

[0026] Side plates 203, made of metal, are integrally formed or bolted to the two edges of the sealing plate 201 and are used to limit and fix the sealing plate 201. The two side plates 203 are bolted to the water inlet end face of the valve body 1, and the two side plates 203 are symmetrically arranged along the central axis of the valve body 1. A second support shaft 204 is fixedly connected between the two side plates 203. The second support shaft 204 is arranged parallel to the first support shaft 102 and the two are located in the same horizontal plane. Two connecting blocks 2041 are fixed to the outer wall of the second support shaft 204. Both connecting blocks 2041 are connected to an arc-shaped limiting structure 3 fixed to the valve plate 104. This is used to limit the maximum opening angle of the valve plate 104 and prevent the valve plate 104 from being damaged by excessive rotation due to water flow impact.

[0027] The support shaft 102 is provided with a support shaft 3 105 parallel to it on the side away from the water inlet. Both ends of the support shaft 3 105 are also fixedly connected to the inner wall of the valve body 1. Two springs 106 are sleeved on the outer side of the support shaft 102, and the two springs 106 correspond to the two valve plates 104 respectively. The springs 106 are in a compressed state, one end of the springs 106 is hooked to the support shaft 105 through a bending structure, and the other end abuts against the bottom of the valve plate 104. The elastic restoring force of the springs 106 provides a continuous closing driving force for the valve plate 104, ensuring that the valve plate 104 can tightly fit the sealing assembly 2 when there is no water flow, so as to achieve reliable backflow prevention.

[0028] The centers of the sealing plate 201, sliding plate 202 and limiting structure 3 are all coincident with the axis of the support shaft 102, so that the valve plate 104, sliding plate 202 and limiting structure 3 all move in an arc around the axis of the support shaft 102, avoiding motion interference, while ensuring that the sliding plate 202 is always in close contact with the sealing plate 201.

[0029] In some preferred embodiments, the two sliding plates 202 are arranged longitudinally and distributed sequentially. The sliding plate 202 closer to the sealing plate 201 is slidably connected to the inner wall of the sealing plate 201, and the other sliding plate 202 is slidably connected to the sealing plate 201 through a sealing strip. The sealing strip is fixed at the end of the sealing plate 201 near the valve plate 104 to prevent water from entering the water flow channel 101 through the gap between the valve plate 104 and the sealing plate 201 when the valve plate 104 is rotated.

[0030] In some preferred embodiments, the limiting structure 3 includes an arc-shaped plate 301 with the same curvature as the sliding plate 202. An arc-shaped groove 3011 with the same curvature as the arc-shaped plate 301 is provided through the center of the arc-shaped plate 301. The arc-shaped groove 3011 is adapted to the outer diameter of the second support shaft 204, so that the arc-shaped plate 301 is slidably sleeved on the second support shaft 204 through the arc-shaped groove 3011.

[0031] In some preferred embodiments, one end of the arc plate 301 is fixed to the end face of the valve plate 104, and a cylinder 302 is fixed in the arc groove 3011 at the end away from the valve plate 104. The output end of the cylinder 302 is fixedly connected to the connecting block 2041 via a spring 303 towards the support shaft 204.

[0032] In some preferred embodiments, a fastening structure 4 is provided between the valve plate 104 and the support shaft 102. The fastening structure 4 includes a rotating end 401 and a fixed end 402. The fixed end 402 is fixed to the fixed end 402. The rotating end 401 is rotatably connected to the support shaft 102. The fixed end 402 is fixedly connected to the valve plate 104. The fastening structure 4 enables the valve plate 104 to rotate around the support shaft 102.

[0033] In some preferred embodiments, a detection groove 107 is provided on the side of the valve plate 104 near the spring 106. The detection groove 107 is used to install a force sensor. The value detected by the force sensor reflects the impact force borne by the side of the valve plate 104 near the spring 106.

[0034] Working principle: During the operation of the wafer check valve, water flows through the water flow channel 101. Before entering the water flow channel 101, the water flow first impacts the side of the valve plate 104 away from the spring 106. The water flow gives the valve plate 104 an impact force, causing the valve plate 104 to rotate towards the side of the spring 106 based on the support shaft 102. While the valve plate 104 is rotating, the spring 106 is compressed. Due to the rotation of the valve plate 104, a gap is created between the valve plate 104 and the valve body 1, thus opening the water flow channel 101. The water flow will enter the other side of the valve plate 104 through the gap between the valve plate 104 and the valve body 1, thus allowing the water flow to pass through the water flow channel 101.

[0035] When the water flow that has entered the valve plate 104 from the side away from the spring 106 flows back, the backflow will impact the side of the valve plate 104 close to the spring 106. At this time, the impact force of the backflow on the side of the valve plate 104 close to the spring 106 is balanced with the impact force of the water flow before entering the water flow channel 101 on the side of the valve plate 104 away from the spring 106. Due to the elastic force of the spring 106 on the valve plate 104, the valve plate 104 rotates and closes the water flow channel 101 again.

[0036] When the water flows into the water flow channel 101 and impacts the side of the valve plate 104 away from the spring 106, the valve plate 104 rotates, opening the water flow channel 101. As the two valve plates 104 rotate, a gap (such as...) is created between them. Figure 6 As shown, since the valve plate 104 is fixed to the sliding plate 202, when the valve plate 104 rotates based on the support shaft 102, it drives the sliding plate 202 fixed to it to rotate simultaneously. Since the sliding plate 202, the sealing plate 201 and the support shaft 102 are coaxial, when the valve plate 104 and the support shaft 102 rotate, the outer wall of the sliding plate 202 is always in close contact with the sealing plate 201, thereby isolating the water flow channel 101 between the two valve plates 104 and preventing water from passing between the two valve plates 104.

[0037] To prevent water backflow, the impact force on the valve plate 104 on the inlet side must be greater than the sum of the impact force on the other side and the spring force of spring 106. Therefore, by changing the spring force of spring 106, the force required to cause the backflowing water to impact the valve plate 104 and make it rotate can be changed, thereby increasing the sensitivity of the valve plate 104 rotation.

[0038] A force sensor is installed in the detection tank 107 to reflect the impact force of the backflow water on the valve plate 104. The force value detected by the force sensor when the valve plate 104 rotates is observed, and the detected force value is the closing value of the valve plate 104.

[0039] During the use of the check valve, when the value detected by the force sensor reaches the closing value of the valve plate 104, but the valve plate 104 does not close, it indicates that the water flow on the inlet side has a relatively large impact force on the valve plate 104, or the spring 106 is damaged, reducing the elastic force it provides. At this time, by starting the cylinder 302, the effective length of the adjusting spring 303 is changed, thereby changing the elastic force of the adjusting spring 303 on the cylinder 302 and the arc plate 301. This is achieved by the fixed connection between the arc plate 301 and the valve plate 104, which acts on the valve plate 104. Based on the elastic force applied by the spring 106 to the valve plate 104, the elastic force of the adjusting spring 303 is increased to ensure the rotation of the valve plate 104 and thus the sensitivity of opening and closing the water flow channel 101.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wafer-type check valve, characterized in that, Includes a valve body (1), in which a water flow channel (101) is provided, and a support shaft (102) fixed to the inner wall of the valve body (1) is provided in the center of the water flow channel (101), and the support shaft (102) is close to the water inlet; The valve body (1) has two mounting slots (103) symmetrically opened on one end face of the support shaft (102) along the central axis of the valve body. A sealing assembly (2) is provided in both mounting slots (103). The sealing assembly (2) is closer to the water inlet side than the support shaft (102). Two valve plates (104) are provided between the sealing assembly (2) and the support shaft (102) to form a seal with the water flow channel (101). The sealing assembly (2) includes an arc-shaped sealing plate (201) that is fixed together with the two mounting grooves (103). The inner wall of the sealing plate (201) has two arc-shaped sliding plates (202) with the same curvature as the sealing plate (201) that are slidably connected. The two sliding plates (202) are respectively fixed to the end face of the valve plate (104). The sealing plate (201) has side plates (203) fixed to the valve body (1) at its two sides respectively, and the two side plates (203) are arranged symmetrically along the central axis of the valve body; the two side plates (203) are fixedly connected to a second support shaft (204), which is arranged parallel to the first support shaft (102); the outer wall of the second support shaft (204) has two connecting blocks (2041), and both connecting blocks (2041) are connected to an arc-shaped limiting structure (3) fixed to the valve plate (104); The support shaft 1 (102) is provided with a support shaft 3 (105) parallel to it on the side away from the water inlet. Both ends of the support shaft 3 (105) are also fixedly connected to the inner wall of the valve body (1). Two springs (106) are sleeved on the outside of the first support shaft (102), and the two springs (106) correspond to the two valve plates (104) respectively; one end of the spring (106) is hooked to the third support shaft (105) through a bending structure, and the other end abuts against the bottom of the valve plate (104); The centers of the sealing plate (201), sliding plate (202) and limiting structure (3) all coincide with the axis of the support shaft (102).

2. A wafer-type check valve according to claim 1, characterized in that, The two sliding plates (202) are arranged longitudinally and distributed in sequence. The sliding plate (202) closer to the sealing plate (201) is slidably connected to the inner wall of the sealing plate (201), and the other sliding plate (202) is slidably connected to the sealing plate (201) through a sealing strip. The sealing strip is fixed at the end of the sealing plate (201) near the valve plate (104).

3. A wafer-type check valve according to claim 1, characterized in that, The limiting structure (3) includes an arc plate (301), the curvature of which is consistent with that of the sliding plate (202). The arc plate (301) has an arc groove (3011) with the same curvature as itself through its center. The arc groove (3011) is adapted to the outer diameter of the second support shaft (204). The arc plate (301) is slidably sleeved on the second support shaft (204) through the arc groove (3011).

4. A wafer-type check valve according to claim 3, characterized in that, One end of the arc plate (301) is fixedly connected to the end face of the valve plate (104). A cylinder (302) is fixed in the arc groove (3011) at the end of the arc plate (301) away from the valve plate (104). The output end of the cylinder (302) faces the second support shaft (204) and is fixedly connected to the connecting block (2041) through the second spring (303).

5. A wafer-type check valve according to claim 1, characterized in that, A fastening structure (4) is provided between the valve plate (104) and the support shaft (102). The fastening structure (4) includes a rotating end (401) and a fixed end (402). The rotating end (401) is rotatably connected to the support shaft (102), and the fixed end (402) is fixedly connected to the valve plate (104). The valve plate (104) rotates around the support shaft (102) through the fastening structure (4).

6. A wafer-type check valve according to claim 1, characterized in that, A detection groove (107) is provided on the side of the valve plate (104) near the spring (106). A force sensor is installed in the detection groove (107) to detect the impact force borne by the side of the valve plate (104) near the spring (106).

7. A wafer-type check valve according to claim 1, characterized in that, The sealing plate (201) and the side plate (203) are integrally formed structures, and the side plate (203) is fixedly connected to the water inlet end face of the valve body (1) by bolts.

8. A wafer-type check valve according to claim 1, characterized in that, The first support shaft (102) and the second support shaft (204) are located in the same horizontal plane, and the spring (106) is in a compressed state.

9. A wafer-type check valve according to claim 1, characterized in that, The two valve plates (104) are arranged symmetrically and can completely cover the cross-section of the water flow channel (101) after being spliced. The edge contour of the valve plate (104) is adapted to the inner wall of the water flow channel (101).

10. A wafer-type check valve according to claim 9, characterized in that, The curvature of the mounting groove (103) is adapted to the arc-shaped structure of the sealing assembly (2).

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