Valve plate of double-plate check valve

Abstract

The double-plate check valve plate comprises a valve body, the interior of the valve body is rotationally connected with two valve plate bodies which are oppositely arranged in parallel, the two sides of each valve plate body are provided with a water inlet cavity and a water outlet cavity respectively, a cross beam is arranged between the two valve plate bodies, and one end, close to the water outlet cavity, of the cross beam is provided with a water inlet and a water outlet. Fixing heads are fixedly connected to the two valve plates, connectors which are arranged in a staggered mode are connected to the inner sides of the fixing heads, and pull ropes are fixedly connected to the outer sides, close to the cross beam, of the connectors. When fluid flows from the water outlet cavity to the water inlet cavity, the extension spring shrinks to enable the valve plate to be tightly attached through the pull rope to prevent the fluid from flowing back, the sealing performance is improved, when the fluid flows from the water inlet cavity to the water outlet cavity, the valve plate rotates around the valve body to be opened, the cross beam does not hinder the valve plate, and all the components cooperate to enable the valve plate to be rapidly and accurately closed during reverse flowing. The valve plate is opened and closed stably and smoothly, the reliability of the check valve is improved, the service life of the check valve is prolonged, and normal operation of a pipeline system is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of double-plate check valves, in particular to a valve plate of a double-plate check valve. Background Art

[0002] In pipeline fluid transportation systems, check valves are important control components used to prevent fluid backflow.

[0003] Traditional check valves have some shortcomings, such as less than ideal sealing performance, which makes them prone to leakage after long-term use, which may lead to problems such as reduced system efficiency and equipment damage; in addition, the valve plate structure design of some check valves is not reasonable. During the fluid flow process, the opening and closing action of the valve plate is not smooth enough, and may be affected by fluid impact and become unstable, affecting the normal operation of the check valve.

[0004] To this end, we propose a double-plate check valve plate. Utility Model Content

[0005] The main purpose of the utility model is to provide a double-plate check valve plate to prevent fluid leakage from causing reduced system efficiency and equipment damage, as well as unstable valve plate movement affecting the normal operation of the check valve, thereby improving the sealing performance and working stability of the check valve and effectively solving the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A double-plate check valve plate comprises a valve body, wherein the valve body is internally rotatably connected to two relatively parallel valve plates, a water inlet chamber and a water outlet chamber are respectively provided on both sides of the valve plates, a crossbeam is provided between the two valve plates, and the crossbeam is close to one end of the water outlet chamber, and the two valve plates are fixedly connected to a fixing head, the inner side of the fixing head is connected to a staggered connecting head, the outer side of the connecting head close to the crossbeam is fixedly connected to a draw rope, the outer side of the draw rope is provided with an elastic protective sleeve, and the end of the draw rope away from the connecting head is fixedly installed with a tension spring;

[0008] A guide groove is provided inside the crossbeam, the tension spring is movably arranged in the guide groove, a winding seat is fixedly installed at the bottom of the guide groove, and the pull rope and the elastic protective sleeve are movably wound on the winding seat.

[0009] By adopting the above technical solution, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the two valve plates, overcoming the tension of the tension spring, causing the valve plates to rotate around the valve body and open. At this time, the pull rope is gradually stretched during the rotation of the valve plate, and the tension spring is further stretched. The elastic protective sleeve protects the pull rope from erosion and wear of the fluid. At the same time, because the crossbeam is close to one end of the water outlet chamber, the crossbeam will not hinder the opening of the valve plate when the fluid flows in the forward direction.

[0010] When the fluid tries to flow from the water outlet chamber to the water inlet chamber, the pressure of the fluid acts on the valve plate, causing the valve plate to tend to rotate in the closing direction. At this time, the tension spring begins to contract, and the valve plate is quickly closed by pulling the rope. The staggered connectors connected to the inner sides of the fixed heads on the two valve plates ensure that the rope can stably pull the valve plates, so that the two valve plates can fit tightly to prevent fluid backflow. The rope is wound on the winding seat to ensure that the rope can be stretched and retracted in an orderly manner during the movement. The guide groove provides a stable track for the movement of the tension spring, ensuring that the tension spring can play its role accurately.

[0011] Furthermore, a rotating shaft, a fixed shaft and a torsion spring are also provided in the valve body, and the rotating shaft and the fixed shaft are both fixed on the valve body.

[0012] By adopting the above technical solution, the rotating shaft is fixed on the valve body, providing a rotation support point for the two relatively parallel valve plates. When the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate, and the valve plate rotates and opens with the rotating shaft as the center. During this process, the rotating shaft ensures that the valve plate rotates smoothly and in the correct direction, so that the valve plate can be smoothly pushed open by the fluid, allowing the fluid to pass through the valve body smoothly. During reverse flow, when the pressure of the fluid attempts to close the valve plate, the rotating shaft also ensures that the valve plate can be quickly and accurately rotated to the closed position, cooperating with other components to prevent the fluid from flowing back.

[0013] The fixed shaft is also fixed on the valve body. It mainly provides fixed support for components such as the torsion spring. During forward flow, as the valve plate opens, the torsion spring deforms and stores elastic potential energy. The fixed shaft ensures that the torsion spring is stable in position during the deformation process and will not shift or misalign. When the flow is reverse, the torsion spring releases elastic potential energy to assist the valve plate in closing. The fixed shaft ensures that the torsion spring can accurately transfer the stored energy to the valve plate, so that the valve plate can fit quickly and tightly to achieve the check function. At the same time, the fixed shaft also provides a certain stability for the entire valve plate structure, and together with the rotating shaft, ensures that the valve plate can operate normally and reliably during operation.

[0014] Furthermore, two torsion springs are provided and sleeved on the rotating shaft, and the rotating shaft is rotatably connected to two connecting pieces.

[0015] By adopting the above technical solution, when the fluid flows from the water inlet chamber to the water outlet chamber, the valve plate rotates around the rotating shaft to open. At this time, the torsion spring is twisted and stores elastic potential energy. In this process, the torsion spring provides a certain resistance to the opening of the valve plate, preventing the valve plate from over-opening due to fluid impact; on the other hand, the stored elastic potential energy prepares for the subsequent closing of the valve plate. When the fluid attempts to flow from the water outlet chamber to the water inlet chamber, the pressure of the fluid acts on the valve plate, causing it to tend to rotate in the closing direction. At this time, the torsion spring releases the stored elastic potential energy, assisting the valve plate to close quickly, and working together with the tension spring and the pull rope to ensure that the valve plate can fit tightly, effectively preventing fluid backflow.

[0016] The rotating shaft serves as the support point for the rotation of the valve plate, and is connected to two connecting parts for rotation. During the opening and closing process of the valve plate, the connecting parts move with the rotation of the rotating shaft, playing the role of connecting and transmitting force. When the valve plate is opened, the connecting parts connect the valve plate with the movement of the rotating shaft, so that the valve plate can rotate stably around the rotating shaft; during the closing process, the connecting parts assist the torsion spring to transfer the stored energy to the valve plate, promoting the rapid closing of the valve plate; at the same time, the connecting parts also enhance the stability and reliability of the entire structure, ensuring that the valve plate can accurately respond to changes in the flow direction of the fluid during operation and realize the check function.

[0017] Furthermore, the two connecting members are respectively located on both sides of the rotating shaft and are fixedly connected to the valve plate, and the fixed shaft is connected to the valve plate via a torsion spring.

[0018] By adopting the above technical solution, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate, and the valve plate rotates around the rotating axis to open. At this time, the connecting member moves around the rotating axis as the valve plate rotates, playing the role of transmitting force and stabilizing the movement of the valve plate. The connecting member ensures that the valve plate can rotate smoothly around the rotating axis during the opening process without shaking or deviation. During reverse flow, when the valve plate needs to be closed, the connecting member also helps the valve plate to quickly return to the closed position, working in conjunction with other components to prevent fluid backflow.

[0019] During forward flow, the valve plate opens, the torsion spring is sleeved on the rotating shaft and twisted, storing elastic potential energy, and the fixed shaft provides a fixed support point for the torsion spring, ensuring that the torsion spring is stable in position during deformation. When the fluid flows from the water outlet chamber to the water inlet chamber, the torsion spring releases elastic potential energy and transfers energy to the valve plate through the connection between the fixed shaft and the valve plate, prompting the valve plate to close quickly. The existence of the fixed shaft ensures that the torsion spring can play its role accurately and cooperate with the valve plate and other components to achieve reliable operation of the check valve.

[0020] Furthermore, the two torsion arms of the torsion spring are fixedly connected to the fixed shaft and the valve plate respectively.

[0021] By adopting the above technical solution, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate, and the valve plate rotates and opens around the rotating shaft. During this process, the two torsion arms of the torsion spring are deformed as the valve plate rotates. One torsion arm is fixedly connected to the valve plate and moves as the valve plate rotates, while the other torsion arm is fixedly connected to the fixed shaft and remains relatively stable. The torsion spring is twisted in this process, storing elastic potential energy.

[0022] When fluid attempts to flow from the outlet chamber to the inlet chamber, the fluid pressure acts on the valve disc, causing it to rotate toward closing. At this point, the elastic potential energy stored in the torsion spring begins to release. The torsion arm, fixed to the fixed shaft, remains relatively stable, while the torsion arm, fixed to the valve disc, moves with the disc's rotation, pushing the disc to close quickly. The torsion spring, fixedly connected to the fixed shaft and the valve disc via two torsion arms, provides additional closing force during reverse flow. Working together with the tension spring and pull rope, it ensures a tight fit between the disc and effectively prevents backflow.

[0023] Furthermore, flanges are provided at both ends of the valve body.

[0024] By adopting the above technical solution, in actual applications, the check valve can be conveniently connected to the pipeline system through the flange. The flange connection has the advantages of good sealing and easy installation and disassembly. When the check valve is installed in the pipeline system, the flange is tightly connected to the corresponding flange on the pipeline through fasteners such as bolts, ensuring that the connection between the valve body and the pipeline is firm and reliable without leakage. When the fluid flows through the check valve, the flange can withstand the pressure and impact force of the fluid and maintain the stable position of the check valve in the pipeline system; at the same time, the flange design also facilitates the maintenance and inspection of the check valve. When the check valve needs to be repaired or replaced, the check valve can be easily separated from the pipeline system by disassembling the flange connection, thereby improving work efficiency.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The utility model provides a double-plate check valve plate. When the fluid attempts to flow from the water outlet chamber to the water inlet chamber, the tension spring contracts, and the valve plate is quickly closed by pulling the pull rope. The staggered connectors connected to the inner sides of the fixed heads on the two valve plates ensure that the pull rope can stably pull the valve plates, so that the two valve plates can fit tightly. This structural design effectively prevents the backflow of fluid, improves the sealing performance of the check valve, and reduces the possibility of leakage, thereby ensuring the normal operation of the pipeline system and avoiding problems such as reduced system efficiency and equipment damage caused by leakage.

[0027] (2) The utility model provides a double-plate check valve plate. When the fluid flows from the water inlet chamber to the water outlet chamber, the valve plate rotates around the valve body to open. The pull rope is gradually stretched during the rotation of the valve plate, and the tension spring is further stretched. At the same time, the crossbeam is close to one end of the water outlet chamber, which will not hinder the opening of the valve plate when the fluid flows in the forward direction; when the fluid flows in the reverse direction, the tension spring, pull rope, connector and crossbeam and other components work together to enable the valve plate to close quickly and accurately. This design makes the opening and closing actions of the valve plate more stable and smooth, reduces the instability of the valve plate caused by fluid impact, and improves the reliability and service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of a double-plate check valve plate of the utility model.

[0029] Figure 2 This is an internal top view of a valve plate of a double-plate check valve of the present invention.

[0030] Figure 3 The utility model is a schematic diagram of the internal structure of the guide groove of the valve plate of a double-plate check valve.

[0031] In the figure: 1. Valve body; 2. Crossbeam; 3. Valve plate; 4. Guide groove; 5. Fixed head; 6. Connector; 7. Pull rope; 8. Elastic protective sleeve; 9. Tension spring; 10. Winding seat; 11. Rotating shaft; 12. Connector; 13. Torsion spring; 14. Fixed shaft; 15. Flange. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0033] In order to prevent fluid leakage from causing reduced system efficiency and equipment damage, as well as unstable valve plate movement affecting the normal operation of the check valve, the sealing performance and working stability of the check valve are improved. Figure 1 、 Figure 2 、 Figure 3 As shown, a double-plate check valve plate comprises a valve body 1, wherein the valve body 1 is internally rotatably connected to two relatively parallel valve plates 3, wherein a water inlet chamber and a water outlet chamber are respectively provided on both sides of the valve plates 3, a crossbeam 2 is provided between the two valve plates 3, and the crossbeam 2 is close to one end of the water outlet chamber, and the two valve plates 3 are fixedly connected to a fixing head 5, the inner side of the fixing head 5 is connected to a staggered connecting head 6, the connecting head 6 is fixedly connected to a pull rope 7 near the outer side of the crossbeam 2, the outer side of the pull rope 7 is provided with an elastic protective sleeve 8, and the end of the pull rope 7 away from the connecting head 6 is fixedly installed with a tension spring 9;

[0034] A guide groove 4 is provided inside the crossbeam 2 , and the tension spring 9 is movably arranged in the guide groove 4 . A winding seat 10 is fixedly installed at the bottom of the guide groove 4 , and the pull rope 7 and the elastic protective sleeve 8 are movably wound on the winding seat 10 .

[0035] During use, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the two valve plates 3, overcoming the tension of the tension spring 9, causing the valve plates 3 to rotate around the valve body 1 and open. At this time, the pull rope 7 is gradually stretched during the rotation of the valve plate 3, and the tension spring 9 is further stretched. The elastic protective sleeve 8 protects the pull rope 7 from erosion and wear of the fluid. At the same time, because the crossbeam 2 is close to one end of the water outlet chamber, the crossbeam 2 will not hinder the opening of the valve plate 3 when the fluid flows in the forward direction.

[0036] When the fluid tries to flow from the water outlet chamber to the water inlet chamber, the pressure of the fluid acts on the valve plate 3, causing the valve plate 3 to tend to rotate in the closing direction. At this time, the tension spring 9 begins to shrink, and the valve plate 3 is quickly closed by pulling the pull rope 7. The staggered connecting heads 6 connected to the inner sides of the fixed heads 5 on the two valve plates 3 ensure that the pull rope 7 can stably pull the valve plates 3, so that the two valve plates 3 can fit tightly to prevent the fluid from flowing back. The pull rope 7 is wound on the winding seat 10 to ensure that the pull rope 7 can be stretched and retracted in an orderly manner during the movement. The guide groove 4 provides a stable track for the movement of the tension spring 9, ensuring that the tension spring 9 can play its role accurately.

[0037] For example, Figure 2 As shown, the present invention further includes that a rotating shaft 11 , a fixed shaft 14 and a torsion spring 13 are further provided in the valve body 1 , and the rotating shaft 11 and the fixed shaft 14 are both fixed on the valve body 1 .

[0038] When in use, the rotating shaft 11 is fixed to the valve body 1, providing a rotation support point for the two relatively parallel valve plates 3. When the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate 3, and the valve plate 3 rotates and opens with the rotating shaft 11 as the center. During this process, the rotating shaft 11 ensures that the valve plate 3 rotates smoothly and in the correct direction, so that the valve plate 3 can be smoothly pushed open by the fluid, allowing the fluid to pass through the valve body 1 smoothly. During reverse flow, when the pressure of the fluid attempts to close the valve plate 3, the rotating shaft 11 also ensures that the valve plate 3 can be quickly and accurately rotated to the closed position, cooperating with other components to prevent the fluid from flowing back.

[0039] The fixed shaft 14 is also fixed on the valve body 1. It mainly provides fixed support for components such as the torsion spring 13. During forward flow, as the valve plate 3 opens, the torsion spring 13 deforms and stores elastic potential energy. The fixed shaft 14 ensures that the torsion spring 13 is stable in position during the deformation process and will not be offset or misplaced; when reverse flow occurs, the torsion spring 13 releases elastic potential energy to assist the valve plate 3 in closing. The fixed shaft 14 ensures that the torsion spring 13 can accurately transfer the stored energy to the valve plate 3, so that the valve plate 3 can fit quickly and tightly to achieve the check function; at the same time, the fixed shaft 14 also provides a certain stability for the entire valve plate structure, and together with the rotating shaft 11, ensures that the valve plate 3 can operate normally and reliably during operation.

[0040] For example, Figure 2 As shown, the present invention further includes that two torsion springs 13 are provided and sleeved on the rotating shaft 11 , and the rotating shaft 11 is rotatably connected to two connecting members 12 .

[0041] During use, when the fluid flows from the water inlet chamber to the water outlet chamber, the valve plate 3 rotates around the rotating shaft 11 to open. At this time, the torsion spring 13 is twisted to store elastic potential energy. In this process, the torsion spring 13 provides a certain resistance to the opening of the valve plate 3 on the one hand, preventing the valve plate 3 from over-opening due to the impact of the fluid; on the other hand, the stored elastic potential energy prepares for the subsequent closing of the valve plate 3. When the fluid attempts to flow from the water outlet chamber to the water inlet chamber, the pressure of the fluid acts on the valve plate 3 to make it tend to rotate in the closing direction. At this time, the torsion spring 13 releases the stored elastic potential energy, assisting the valve plate 3 to close quickly, and working together with the tension spring 9 and the pull rope 7 to ensure that the valve plate 3 can fit tightly, effectively preventing the fluid from flowing back.

[0042] The rotating shaft 11 serves as the support point for the rotation of the valve plate 3, and is simultaneously connected to two connecting parts 12 for rotation. During the opening and closing process of the valve plate 3, the connecting part 12 moves with the rotation of the rotating shaft 11, playing the role of connecting and transmitting force. When the valve plate 3 is opened, the connecting part 12 connects the valve plate 3 with the movement of the rotating shaft 11, so that the valve plate 3 can stably rotate around the rotating shaft 11; during the closing process, the connecting part 12 assists the torsion spring 13 to transfer the stored energy to the valve plate 3, promoting the rapid closing of the valve plate 3; at the same time, the connecting part 12 also enhances the stability and reliability of the entire structure, ensuring that the valve plate 3 can accurately respond to changes in the flow direction of the fluid during operation and realize the check function.

[0043] For example, Figure 2 As shown, the present invention further includes two connecting members 12 respectively located on both sides of the rotating shaft 11 and fixedly connected to the valve plate 3 , and the fixed shaft 14 is connected to the valve plate 3 via a torsion spring 13 .

[0044] During use, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate 3, and the valve plate 3 rotates around the rotating shaft 11 to open. At this time, the connecting member 12 moves around the rotating shaft 11 as the valve plate 3 rotates, playing the role of transmitting force and stabilizing the movement of the valve plate 3. The connecting member 12 ensures that the valve plate 3 can rotate smoothly around the rotating shaft 11 during the opening process without shaking or deviation. During reverse flow, when the valve plate 3 needs to be closed, the connecting member 12 also helps the valve plate 3 to quickly return to the closed position, and cooperates with other components to prevent the fluid from flowing back.

[0045] During forward flow, the valve plate 3 opens, the torsion spring 13 is sleeved on the rotating shaft 11 and twisted, storing elastic potential energy, and the fixed shaft 14 provides a fixed support point for the torsion spring 13 to ensure that the torsion spring 13 is in a stable position during the deformation process. When the fluid flows from the water outlet chamber to the water inlet chamber, the torsion spring 13 releases the elastic potential energy and transmits the energy to the valve plate 3 through the connection between the fixed shaft 14 and the valve plate 3, prompting the valve plate 3 to close quickly. The existence of the fixed shaft 14 ensures that the torsion spring 13 can play its role accurately, cooperate with the valve plate 3 and other components, and realize the reliable operation of the check valve.

[0046] For example, Figure 2 As shown, the present invention further includes that the two torsion arms of the torsion spring 13 are fixedly connected to the fixed shaft 14 and the valve plate 3 respectively.

[0047] During use, when the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the valve plate 3, and the valve plate 3 rotates around the rotating shaft 11 to open. During this process, the two torsion arms of the torsion spring 13 are deformed as the valve plate 3 rotates. One of the torsion arms is fixedly connected to the valve plate 3 and moves as the valve plate 3 rotates, while the other torsion arm is fixedly connected to the fixed shaft 14 and remains relatively stable. The torsion spring 13 is twisted in this process, storing elastic potential energy.

[0048] When fluid attempts to flow from the outlet chamber to the inlet chamber, the fluid pressure acts on the valve plate 3, causing it to rotate in the closing direction. At this point, the elastic potential energy stored in the torsion spring 13 begins to be released. The torsion arm fixedly connected to the fixed shaft 14 remains relatively stable, while the torsion arm fixedly connected to the valve plate 3 moves as the valve plate 3 rotates, pushing the valve plate 3 to close quickly. The torsion spring 13, through its two torsion arms fixedly connected to the fixed shaft 14 and the valve plate 3, respectively, provides additional closing force for the valve plate 3 during reverse flow. Working together with the tension spring 9 and the pull rope 7, it ensures a tight fit between the valve plate 3 and the valve plate 3, effectively preventing fluid backflow.

[0049] For example, Figure 1 、 Figure 2 As shown, the present invention further includes that flanges 15 are provided at both ends of the valve body 1 .

[0050] During use, in actual applications, the check valve can be conveniently connected to the pipeline system through the flange 15. The flange connection has the advantages of good sealing and easy installation and disassembly. When the check valve is installed in the pipeline system, the flange 15 is tightly connected to the corresponding flange on the pipeline through fasteners such as bolts, ensuring that the connection between the valve body 1 and the pipeline is firm and reliable without leakage. When the fluid flows through the check valve, the flange 15 can withstand the pressure and impact force of the fluid and maintain the stable position of the check valve in the pipeline system; at the same time, the design of the flange 15 also facilitates the maintenance and inspection of the check valve. When the check valve needs to be repaired or replaced, the check valve can be easily separated from the pipeline system by disassembling the flange connection, thereby improving work efficiency.

[0051] It should be noted that the utility model is a double-plate check valve plate. Align the flange 15 of the check valve with the corresponding flange on the pipeline system to ensure accurate installation position. Use fasteners such as bolts to tightly connect the flange 15 of the check valve to the pipeline flange to ensure a firm and reliable connection without leakage.

[0052] When the fluid flows from the water inlet chamber to the water outlet chamber, the pressure of the fluid acts on the two valve plates 3, overcoming the tension of the tension spring 9, causing the valve plate 3 to rotate around the valve body 1 to open; at this time, the pull rope 7 is gradually stretched during the rotation of the valve plate 3, the tension spring 9 is further stretched, and the elastic protective sleeve 8 protects the pull rope 7 from erosion and wear of the fluid; at the same time, the rotating shaft 11 ensures that the valve plate 3 rotates smoothly and in the correct direction, the torsion spring 13 is twisted to store elastic potential energy, and the connecting piece 12 moves with the rotation of the valve plate 3, playing the role of connecting and transmitting force. Since the crossbeam 2 is close to one end of the water outlet chamber, when the fluid flows in the forward direction, the crossbeam 2 will not hinder the opening of the valve plate 3;

[0053] When the fluid tries to flow from the water outlet chamber to the water inlet chamber, the pressure of the fluid acts on the valve plate 3, causing the valve plate 3 to tend to rotate in the closing direction. At this time, the tension spring 9 begins to shrink, and the valve plate 3 is quickly closed by pulling the pull rope 7. The staggered connecting heads 6 connected to the inner sides of the fixed heads 5 on the two valve plates 3 ensure that the pull rope 7 can stably pull the valve plates 3, so that the two valve plates 3 can fit tightly to prevent the fluid from flowing back. The torsion spring 13 releases the stored elastic potential energy, and the two torsion arms are respectively fixedly connected to the fixed shaft 14 and the valve plate 3 to provide additional closing force for the valve plate 3. The connecting piece 12 assists the torsion spring 13 to transfer the stored energy to the valve plate 3, thereby promoting the rapid closing of the valve plate 3.

[0054] The above shows and describes the basic principle and main features of the utility model and the

[0055] The advantages of the new invention. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-plate check valve plate, comprising a valve body (1), characterized in that: The valve body (1) is internally rotatably connected to two relatively parallel valve plates (3), a water inlet cavity and a water outlet cavity are respectively provided on both sides of the valve plate (3), a crossbeam (2) is provided between the two valve plates (3), and one end of the crossbeam (2) is close to the water outlet cavity, and the two valve plates (3) are fixedly connected to fixed heads (5), the inner sides of the fixed heads (5) are connected to staggered connecting heads (6), the outer sides of the connecting heads (6) are fixedly connected to a pull rope (7) close to the crossbeam (2), the outer side of the pull rope (7) is provided with an elastic protective sleeve (8), and the end of the pull rope (7) away from the connecting head (6) is fixedly installed with a tension spring (9); A guide groove (4) is provided inside the crossbeam (2), the tension spring (9) is movably arranged in the guide groove (4), a winding seat (10) is fixedly installed at the bottom of the guide groove (4), and the pull rope (7) and the elastic protective sleeve (8) are movably wound on the winding seat (10).

2. The double-plate check valve plate according to claim 1, characterized in that: A rotating shaft (11), a fixed shaft (14) and a torsion spring (13) are also provided in the valve body (1); the rotating shaft (11) and the fixed shaft (14) are both fixed on the valve body (1).

3. The double-plate check valve plate according to claim 2, characterized in that: The torsion springs (13) are provided with two and are sleeved on the rotating shaft (11). The rotating shaft (11) is rotatably connected to two connecting members (12).

4. The double-plate check valve plate according to claim 3, characterized in that: The two connecting members (12) are respectively located on both sides of the rotating shaft (11) and are fixedly connected to the valve plate (3); the fixed shaft (14) is connected to the valve plate (3) via a torsion spring (13).

5. The double-plate check valve plate according to claim 2, characterized in that: The two torsion arms of the torsion spring (13) are fixedly connected to the fixed shaft (14) and the valve plate (3) respectively.

6. The double-plate check valve plate according to claim 1, characterized in that: Both ends of the valve body (1) are provided with flanges (15).

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