Swing check valve with buffer structure

Abstract

The invention relates to the technical field of check valves, in particular to a swing check valve with a buffer structure. Comprising a valve body, the valve body is provided with a liquid inlet and a liquid outlet, a pin shaft is fixedly connected to the interior of the valve body, the pin shaft is rotationally connected with a hinge arm, a shaft sleeve is fixedly connected to the side, away from the pin shaft, of the hinge arm, a valve clack is fixedly connected to the shaft sleeve, the valve clack is provided with an annular groove used for sealing the liquid inlet of the valve body, and the valve body is fixedly connected with the shaft sleeve. The valve clack is fixedly connected with a buffering disc, a sealing disc is connected into the shaft sleeve in a sliding mode, a pressure cavity is jointly formed among the shaft sleeve, the valve clack, the buffering disc and the sealing disc, the sealing disc is fixedly connected with a column cap, and a tension spring is arranged between the column cap and the shaft sleeve. According to the swing check valve, when the valve clack is impacted by low-flow-speed fluid, the impact force of the fluid is buffered through the buffer disc, the impact force borne by the valve clack is shared, meanwhile, the closed state of the valve clack is kept, and the valve clack and the valve body are protected.

Description

Technical Field

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

[0002] A swing check valve is a valve that automatically opens and closes by relying on fluid kinetic energy. It is mainly used to prevent fluid backflow. The working principle of a swing check valve is as follows: when the water flows in the forward direction, the valve disc rotates around the pin shaft due to the impact of the water flow, and the check valve opens. When the water flow speed decreases or the water flows in the reverse direction, the valve disc and the check valve close, and the check valve closes.

[0003] Existing swing check valves rely on the impact force of water flow to push the valve disc to open the check valve. When the check valve needs to be closed but fluid is still flowing in the pipeline (low flow rate), the water flow will impact the valve disc, and the valve disc will quickly close after opening, causing the valve disc to hit the valve body. When there are frequent water flow fluctuations or low flow rates, the contact surface between the valve disc and the valve body and the valve disc will be damaged, affecting the sealing performance of the check valve for a long time. Summary of the Invention

[0004] In order to solve the problem of a swing check valve with a buffer structure, the present invention provides a self-locking swing check valve with a buffer structure.

[0005] The technical solution is: a swing check valve with a buffer structure, including a valve body, wherein the valve body is provided with a liquid inlet and a liquid outlet, a valve cover is installed on the upper side of the valve body, a pin is fixedly connected to the inside of the valve body, the pin is rotatably connected to a hinge arm, the hinge arm is fixedly connected to a shaft sleeve on the side away from the pin shaft, the shaft sleeve is fixedly connected to a valve disc, the valve disc is provided with an annular groove for sealing the liquid inlet of the valve body, the valve disc is fixedly connected to a buffer disk, a sealing disk is slidably connected in the shaft sleeve, a pressure cavity is formed between the shaft sleeve, the valve disc, the buffer disk and the sealing disk, the sealing disk is fixedly connected to a column cap, a tension spring is provided between the column cap and the shaft sleeve, the valve body is slidably connected to a limiting block through a fixed frame, a spring is provided between the limiting block and the fixed frame of the valve body, and a locking assembly is provided on the side of the hinge arm close to the pin shaft, the locking assembly is used to stabilize the hinge arm when the fluid fluctuates.

[0006] Preferably, the buffer tray is made of rubber.

[0007] Preferably, a wedge-shaped surface is provided on the lower side of the limit block, and a shoulder is provided on the side of the sleeve away from the sealing disk. The shoulder of the sleeve pushes the limit block to move through the wedge-shaped surface, and the limit block is provided with a groove for limiting the shoulder of the sleeve, and the groove is located on the upper side of the wedge-shaped surface.

[0008] Preferably, the limiting block is provided with a guide protrusion located above the slot, and the column cap pushes the limiting block to move by squeezing the guide protrusion.

[0009] Preferably, the distance from the guide protrusion to the lowermost side of the limiting block is smaller than the maximum distance that the column cap is offset relative to the sleeve in the direction of the central axis of the sleeve.

[0010] Preferably, the locking assembly includes an insertion rod, a blind hole is provided on the side of the hinge arm close to the pin shaft, the insertion rod is slidably connected to the blind hole of the hinge arm, a compression spring is provided between the insertion rod and the hinge arm, the compression spring is located in the blind hole of the hinge arm, the pin shaft is provided with a limiting hole for limiting the insertion rod, and a connecting rope is provided between the insertion rod and the column cap and passes through the hinge arm and the shaft sleeve.

[0011] Preferably, a pressure-applying component is also included, which is arranged on the upper side of the valve body. The pressure-applying component is used to assist the valve disc to close quickly. The pressure-applying component includes a sleeve, which is fixed to and passes through the side of the valve body close to the pin shaft. A pressure plate is slidably connected in the sleeve, a spring is fixed between the pressure plate and the sleeve, and a vent is provided on the side of the sleeve away from the pressure plate. The pin shaft is rotatably connected to a symmetrically distributed rotating sleeve, a first torsion spring is fixed between the rotating sleeve and the hinge arm, the symmetrically distributed rotating sleeves are commonly fixed to a U-shaped frame, and a pull rope is fixed between the U-shaped frame and the pressure plate.

[0012] Preferably, the diameter of the sleeve vent hole is smaller than the inner diameter of the sleeve.

[0013] Preferably, the valve body is fixed with a fixed rod, and the fixed rod is rotatably connected to a rotating plate, a second torsion spring is arranged between the fixed rod and the rotating plate, the rotating plate is fixed with a limiting rod on the side close to the pressure plate, and the pressure plate is fixed with an intercepting plate on the side close to the limiting rod, and the intercepting plate is provided with an intercepting hole, and the limiting rod is used to be inserted into the intercepting hole of the intercepting plate and limit it, the hinge arm is fixed with a push rod on the side close to the pin shaft, and the rotating plate is located on the rotation path of the push rod.

[0014] Preferably, an inclined surface is provided on a side of the limiting rod close to the pressure plate, and the intercepting plate is pushed to move by the inclined surface of the limiting rod.

[0015] The present invention has the following advantages: 1. When the valve disc is impacted by a low-flow fluid, the swing check valve buffers the impact force of the fluid through the buffer disk, shares the impact force on the valve disc, and at the same time keeps the valve disc in a closed state, protecting the valve disc and the valve body.

[0016] 2. This swing check valve limits the hinge arm through the insertion rod, thereby indirectly limiting the valve disc, so that the valve disc always remains in the closed state before the pipeline pressure reaches the valve disc open state, protecting the valve disc and valve body.

[0017] 3. When the valve disc of this swing check valve is fully opened, the valve disc is locked by the limit block and the shaft sleeve, and the valve disc is still locked when the pressure in the pipeline fluctuates.

[0018] 4. This swing check valve does not require a torsion spring to store force during the opening process of the valve disc. After the valve disc is opened, the pressure in the pipeline is used to store force on the torsion spring. During the closing process of the valve disc, the torsion force of the stored force torsion spring is released to assist the rapid closing of the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a cross-sectional view of the three-dimensional structure of the present invention; Figure 3 It is a three-dimensional structural cross-sectional view of the valve body and valve disc of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the valve disc of the present invention in a closed state; Figure 5 This is a schematic diagram of the three-dimensional structure of the pressure-applying assembly of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the hinge arm and sleeve of the present invention; Figure 7 This is a schematic diagram of the three-dimensional structure of the valve disc of the present invention in an open state; Figure 8 Schematic diagram of the three-dimensional structure of the contact between the shoulder and the wedge surface of the sleeve of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the valve disc of the present invention being limited.

[0020] The markings of the various components in the accompanying drawings are as follows: 1: valve body, 2: valve cover, 3: pin, 4: hinge arm, 5: sleeve, 6: valve disc, 7: buffer disk, 701: pressure cavity, 8: sealing disk, 9: column cap, 10: tension spring, 11: limit block, 1101: wedge surface, 1102: slot, 1103: guide protrusion, 12: insertion rod, 13: compression spring, 14: sleeve, 15: pressure plate, 16: rotating sleeve, 17: U-shaped frame, 18: fixing rod, 19: rotating plate, 20: limit rod, 21: intercepting plate, 22: push rod. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0022] A swing check valve with a buffer structure, such as Figure 1-Figure 3 and Figure 7-Figure 9As shown, it includes a valve body 1, a liquid inlet is provided on the left side of the valve body 1, a liquid outlet is provided on the right side, a valve cover 2 is installed on the upper side of the valve body 1 by bolts, and the bolt installation method is convenient for the operator to open the valve cover 2 and repair the parts inside the valve body 1. The left side of the valve body 1 is fixed with a pin shaft 3 placed in front and behind, and the pin shaft 3 is rotatably connected to a hinge arm 4. The lower side of the hinge arm 4 is fixed with a shaft sleeve 5, and the shaft sleeve 5 is fixed with a valve disc 6 for blocking the liquid inlet of the valve body 1. When the flow rate of the fluid in the pipeline decreases, the valve disc 6 actively blocks the liquid inlet of the valve body 1 due to its own gravity. An annular inclined surface is provided on the right side of the liquid inlet of the valve body 1, and the valve disc 6 is set There is an annular groove for sealing the liquid inlet of the valve body 1. The annular groove of the valve disc 6 fits tightly with the annular inclined surface at the liquid inlet of the valve body 1, increasing the contact area between the two, thereby increasing the sealing between the two. A buffer disk 7 is fixedly connected to the left side of the valve disc 6, and a sealing disk 8 is slidingly connected to the left side of the shaft sleeve 5. The buffer disk 7 is made of rubber material. Before the fluid on the left side of the valve body 1 impacts the valve disc 6, it will first contact the buffer disk 7. The buffer disk 7 performs the first buffering on the impact force of the fluid by its own deformation, sharing the impact force of the fluid on the valve disc 6, and ensuring the sealing between the valve disc 6 and the liquid inlet of the valve body 1. The shaft sleeve 5, A pressure cavity 701 is formed between the valve disc 6, the buffer disk 7 and the sealing disk 8. A column cap 9 is fixed to the right side of the sealing disk 8. The diameter of the right side of the column cap 9 is larger than the diameter of the right side of the shaft sleeve 5. A tension spring 10 is arranged between the column cap 9 and the right side of the shaft sleeve 5. The valve body 1 is slidably connected to the limit block 11 through the fixing frame. A spring is arranged between the limit block 11 and the fixing frame of the valve body 1. A wedge surface 1101 is arranged on the lower side of the limit block 11. During the counterclockwise rotation of the column cap 9 around the pin shaft 3, the column cap 9 does not contact the wedge surface 1101. A shoulder is arranged on the left side of the shaft sleeve 5, and the shoulder of the shaft sleeve 5 pushes the limit block through the wedge surface 1101. 11 moves, the limit block 11 is provided with a slot 1102 for limiting the shaft sleeve 5. When the valve disc 6 is fully opened, the shoulder of the shaft sleeve 5 is locked in the slot 1102 and is limited by it and cannot move. The slot 1102 is located on the upper side of the wedge surface 1101. A guide protrusion 1103 is provided on the upper side of the limit block 11. The column cap 9 pushes the limit block 11 to move by squeezing the guide protrusion 1103. The guide protrusion 1103 is provided with two inclined surfaces symmetrically distributed up and down. The distance from the guide protrusion 1103 to the lowermost side of the limit block 11 is less than the maximum distance of the column cap 9 relative to the shaft sleeve 5 in the direction of the central axis of the shaft sleeve 5 (this limitation is to achieve Figure 7 State, when the upper side of the column cap 9 contacts the guide protrusion 1103, the sleeve 5 has not yet contacted the wedge surface 1101), a locking assembly is provided on the upper side of the hinge arm 4, and the locking assembly is used to stabilize the limiting hinge arm 4 when the fluid fluctuates.

[0023] like Figure 4 、 Figure 5 and Figure 7-Figure 9As shown, the locking assembly includes an insert rod 12, a blind hole is provided on the upper side of the hinge arm 4, the insert rod 12 is slidably connected to the blind hole of the hinge arm 4, a compression spring 13 is provided between the insert rod 12 and the hinge arm 4, the compression spring 13 is located in the blind hole of the hinge arm 4, and a limiting hole for limiting the insert rod 12 is provided on the lower side of the middle part of the pin shaft 3. In the initial state, the insert rod 12 is inserted into the limiting hole of the pin shaft 3, and the hinge arm 4 cannot rotate relative to the pin shaft 3. At the same time, the valve disc 6 cannot rotate relative to the pin shaft 3, and the insert rod 12 moves up and down slightly and will not move out of the limiting hole of the pin shaft 3. A connecting rope that passes through the hinge arm 4 and the shaft sleeve 5 is provided between the insert rod 12 and the column cap 9. The column cap 9 moves to the right and drives the insert rod 12 to move downward through the connecting rope.

[0024] Since the existing swing check valve mainly relies on fluid impact to overcome the gravity of the valve disc to complete the opening and closing of the valve, when the swing check valve is not open and the fluid in the pipeline fluctuates, the pressure on the left side of the valve disc increases, thereby impacting the valve disc and causing the swing check valve to open. At this time, the impact force on the left side of the valve disc is small, and the valve disc does not fully open, but only closes after rotating a small angle. The continuous fluctuation of the fluid will seriously affect the sealing performance of the valve disc and the liquid inlet of the valve body (because the valve disc has a certain gravity, it will hit the liquid inlet of the valve body at the moment of closing, and the multi-frequency impact will cause damage to the liquid inlet of the valve body or the valve disc). Therefore, when the left side of the valve disc 6 is subjected to fluid fluctuations, this check valve maintains the closed state of the valve disc 6.

[0025] In order to achieve the above-mentioned effect, when the swing check valve encounters water flow fluctuations, the specific operation is as follows: in the initial state, the insert rod 12 is inserted into the limiting hole of the pin shaft 3, the hinge arm 4 cannot rotate relative to the pin shaft 3, and the valve disc 6 cannot rotate relative to the pin shaft 3. When there is fluid impact on the left side of the valve disc 6, the fluid will first impact the buffer disk 7. Since the buffer disk 7 is made of deformable elastic material, the buffer disk 7 performs the first buffering on the impact force of the fluid by its own deformation, sharing the impact force of the fluid on the valve disc 6, and ensuring the sealing between the valve disc 6 and the liquid inlet of the valve body 1. As the fluid pressure on the left side of the buffer disk 7 continues to increase, the buffer disk 7 squeezes the air in the pressure cavity 701. The body drives the sealing disk 8 to move to the right, and the sealing disk 8 drives the column cap 9 to move to the right, and the tension spring 10 is stretched. The tension spring 10 performs secondary buffering on the impact force of the fluid on the left side of the valve disc 6. In the process of the column cap 9 moving to the right, the column cap 9 drives the plug rod 12 to move downward through the connecting rope, and the compression spring 13 is compressed. The impact force generated by the low-flow fluid cannot make the plug rod 12 move out of the limiting hole of the pin shaft 3. Therefore, the valve disc 6 is still in a closed state and cannot rotate. The impact force of the fluid on the left side of the valve disc 6 is greatly reduced through two bufferings. Under the impact of the low-flow fluid, the valve disc 6 is always in a closed state, avoiding the valve disc 6 from hitting the liquid inlet of the valve body 1, thereby affecting the sealing between the two.

[0026] When the valve disc is in the fully open state, for the case of inconsistent fluid flow rates in some pipelines, the impact force on the left side of the valve disc keeps changing, causing the valve disc to swing continuously around the pin shaft. In this state, it not only affects the flow rate of the fluid in the valve body (the opening angle of the valve disc is related to the impact force of the fluid. When the opening angle of the valve disc becomes smaller, the valve disc will hinder the flow of fluid), but also causes the rotation part between the hinge arm and the pin shaft to be damaged by friction for a long time. In addition, in order to assist the valve disc to close, some swing check valves will set a torsion spring between the hinge arm and the pin. The frequent swinging of the hinge arm will cause the torsion spring between the hinge arm and the pin shaft to continuously accumulate and release force, resulting in a decrease in the torque of the pin shaft for a long time. Therefore, when the valve disc 6 is fully opened, this check valve locks the valve disc 6, and even if the pressure in the pipeline fluctuates, the valve disc 6 still maintains the locked state.

[0027] When the valve disc 6 is opened, the valve disc 6 and the parts thereon are released, and the fluid impacts the buffer disk 7, and the buffer disk 7 drives the valve disc 6 and the parts thereon to rotate counterclockwise around the pin shaft 3. The upper side of the plug rod 12 slides along the middle of the outer side surface of the pin shaft 3, the compression spring 13 remains in a compressed state, and the tension spring 10 remains in a stretched state. As the valve disc 6 continues to rotate counterclockwise, Figure 7 As shown, when the column cap 9 contacts the lower side of the guide protrusion 1103, the upper side of the sleeve 5 has not yet contacted the wedge surface 1101 (the offset of the column cap 9 relative to the sleeve 5 in the direction of the central axis of the sleeve 5 reaches the maximum value). As the column cap 9 continues to move upward to squeeze the guide protrusion 1103, the limit block 11 moves to the left, and the spring on the limit block 11 is compressed. When the upper side of the column cap 9 moves to the upper side of the guide protrusion 1103, the spring on the limit block 11 is reset. Figure 8 As shown, the upper side of the sleeve 5 contacts the lowermost side of the wedge surface 1101. As the sleeve 5 continues to move upward, the upper side of the sleeve 5 squeezes the wedge surface 1101, the limit block 11 moves to the left, and the spring on the limit block 11 is compressed. When the upper side of the sleeve 5 is inserted into the slot 1102, the spring on the limit block 11 is reset. At this time, the state is as shown in FIG. Figure 9As shown, the shaft sleeve 5 is limited by the groove 1102 and cannot move, and the valve disc 6 cannot move. When the flow rate of the fluid in the pipeline fluctuates and decreases slightly, the impact force of the fluid on the buffer disk 7 is reduced (the buffer disk 7 is in an inclined state, and the fluid flow will impact the buffer disk 7). The tension spring 10 in the stretched state resets and drives the column cap 9 to move downward relative to the shaft sleeve 5. However, the upper side of the column cap 9 cannot move to the guide protrusion 1103, but moves up and down above the guide protrusion 1103. Therefore, the shaft sleeve 5 and the valve disc 6 remain in this state and cannot move. The swing check valve converts the relationship between the gravity of the valve disc 6 and the fluid impact force (the existing swing check valve relies on the confrontation between the gravity of the valve disc and the fluid impact force when it is fully opened) into the relationship between the fluid impact force and the pressure borne by the buffer disk 7 (the swing check valve relies on the confrontation between the deformation force of the buffer disk 7 and the tension of the tension spring 10 and the fluid impact force when it is fully opened), so that when pressure fluctuations occur in the pipeline, the valve disc 6 will not swing, thereby ensuring the normal flow of the fluid in the pipeline.

[0028] When the flow rate of the fluid in the pipeline decreases and the valve disc 6 needs to be closed, the impact force on the buffer disk 7 is reduced, and the tension spring 10 resets to drive the column cap 9 to move downward. When the upper side of the column cap 9 contacts the guide protrusion 1103, the limit block 11 moves to the left, and the spring on the limit block 11 is compressed. When the upper side of the column cap 9 moves to the middle of the guide protrusion 1103, the upper side of the sleeve 5 is no longer in the groove 1102, and the tension spring 10 is reset. At this time, due to the gravity of the valve disc 6, the valve disc 6 is released through the sleeve 5 and the tension spring 11. 0 drives the column cap 9 to rotate clockwise around the pin shaft 3. When the upper side of the column cap 9 moves to the lower side of the guide protrusion 1103, the spring on the limit block 11 is reset. During the clockwise rotation of the valve disc 6, the valve disc 6 drives the hinge arm 4 and the plug rod 12 to rotate clockwise through the shaft sleeve 5. When the valve disc 6 blocks the liquid inlet of the valve body 1, the compression spring 13 in the compressed state is reset to drive the plug rod 12 to move upward. The upper end of the plug rod 12 is inserted into the limiting hole of the pin shaft 3. The valve disc 6 returns to its initial state, and the opening and closing process of this check valve is completed. Example

[0029] Based on Example 1, a swing check valve with a buffer structure, such as Figures 1-9As shown, it also includes a pressure component, which is arranged on the upper side of the valve body 1. The pressure component is used to assist the valve disc 6 to close quickly. The pressure component includes a sleeve 14, which is fixed and passes through the left side of the valve body 1. The right side of the sleeve 14 is sealed and slidably connected with a pressure plate 15. A spring is fixed between the pressure plate 15 and the sleeve 14. A vent is provided on the left side of the sleeve 14. The diameter of the vent of the sleeve 14 is smaller than the inner diameter of the sleeve 14. The spring resets in the sleeve 14 so that the pressure plate 15 moves to the right. During the movement, the air inhaled by the vent hole of the sleeve 14 is small. Therefore, the pressure plate 15 will only move slowly to the right. The pin 3 is rotated to connect two symmetrically distributed rotating sleeves 16. A first torsion spring is fixed between the rotating sleeve 16 and the hinge arm 4. The left sides of the two rotating sleeves 16 are fixedly connected to a U-shaped frame 17. A pull rope is fixed between the U-shaped frame 17 and the pressure plate 15. When the valve disc 6 is in the closed state, the pull rope between the U-shaped frame 17 and the pressure plate 15 is not tightened. After the valve disc 6 is fully opened (the state is as shown in FIG. Figure 9 The left side of the hinge arm 4 is fixed with a limit rod 22, which drives the rotating plate 19 to rotate.

[0030] The existing swing check valve will set a torsion spring between the hinge arm and the valve disc to assist in closing the valve disc. However, during the opening process of the valve disc, the torsion spring will increase the resistance of the valve disc when opening, which is not conducive to the opening of the valve disc. During the closing process of the valve disc, if you want to quickly close the valve disc, you can only increase the torsion force of the torsion spring. However, the increase in the torsion force of the torsion spring will further increase the resistance of the valve disc when opening. Therefore, this swing check valve does not require a torsion spring to store force during the opening process of the valve disc 6. After the valve disc 6 is opened, the pressure in the pipeline is used to store force on the torsion spring. During the closing process of the valve disc 6, the torsion force of the stored torsion spring is released to assist in the rapid closing of the valve disc 6.

[0031] In order to solve the above-mentioned problems, the specific operation of the swing check valve is as follows: during the opening process of the valve disc 6, the valve disc 6 drives the shaft sleeve 5 and the hinge arm 4 to rotate counterclockwise, and the hinge arm 4 drives the U-shaped frame 17 to rotate counterclockwise through the two first torsion springs and the two rotating sleeves 16 (the pull rope between the pressure plate 15 and the U-shaped frame 17 is not tightened in the initial state), and the pull rope between the U-shaped frame 17 and the pressure plate 15 is gradually tightened. During the counterclockwise rotation of the hinge arm 4, the hinge arm 4 drives the push rod 22 to rotate counterclockwise. As the push rod 22 rotates counterclockwise, when the upper side of the push rod 22 contacts the right side of the lower surface of the rotating plate 19, the push rod 22 squeezes the rotating plate 19 to rotate counterclockwise around the fixed rod 18, the second torsion spring on the rotating plate 19 accumulates force, and the rotating plate 19 drives the limit rod 20 to gradually move out of the interception hole of the interception plate 21. When the valve disc 6 is fully opened, as shown in FIG. Figure 9 As shown, the limit rod 20 moves out of the interception hole of the interception plate 21, and the limit of the interception plate 21 is released. At this time, the pull rope between the pressure plate 15 and the U-shaped frame 17 is tightened. Since the pressure in the pipeline is greater than the external pressure, the pressure in the pipeline pushes the pressure plate 15 to move to the left, the spring in the sleeve 14 is compressed, and the air in the sleeve 14 is discharged through the exhaust hole (an air bag can be connected to the exhaust hole of the sleeve 14 to prevent external air from entering the sleeve 14). In the process of the pressure plate 15 moving to the left, the pressure plate 15 drives the U-shaped frame 17 and the two rotating sleeves 16 to rotate clockwise around the pin shaft 3 through the pull rope, and force is stored between the two first torsion springs. In the process of closing the valve disc 6, since the diameter of the exhaust hole of the sleeve 14 is smaller than its inner diameter, the spring in the sleeve 14 cannot be reset in a short time to drive the pressure plate 15. When moving to the right, the pressure plate 15 will only move slowly to the right. At this time, the two first torsion springs in the stored force state reset and drive the hinge arm 4 to rotate clockwise, and the auxiliary valve flap 6 closes quickly. In the process of closing the valve flap 6, the hinge arm 4 drives the push rod 22 to rotate clockwise, and the second torsion spring in the stored force state resets and drives the rotating plate 19 to a horizontal state. When the valve flap 6 is closed, as the pressure plate 15 slowly moves to the right, the pressure plate 15 drives the intercepting plate 21 to move to the right. When the right side of the intercepting plate 21 contacts the inclined surface of the left side of the limit rod 20, the intercepting plate 21 squeezes the inclined surface of the limit rod 20 to make it rotate counterclockwise around the fixed rod 18. The first torsion spring accumulates force. When the spring in the sleeve 14 drives the pressure plate 15 to reset, the first torsion spring in the stored force state resets and drives the limit rod 20 to insert into the intercepting hole of the intercepting plate 21.

[0032] The above is a detailed introduction to the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A swing check valve with a buffer structure, characterized in that: The invention comprises a valve body (1), wherein the valve body (1) is provided with a liquid inlet and a liquid outlet, a valve cover (2) is installed on the upper side of the valve body (1), a pin shaft (3) is fixedly connected inside the valve body (1), the pin shaft (3) is rotatably connected to a hinge arm (4), a shaft sleeve (5) is fixedly connected to the side of the hinge arm (4) away from the pin shaft (3), the shaft sleeve (5) is fixedly connected to a valve flap (6), the valve flap (6) is provided with an annular groove for sealing the liquid inlet of the valve body (1), the valve flap (6) is fixedly connected to a buffer disk (7), a sealing disk (8) is slidably connected inside the shaft sleeve (5), and the valve body (1) is provided with a valve cover (6). A pressure cavity (701) is formed between the sleeve (5), the valve flap (6), the buffer disk (7) and the sealing disk (8), the sealing disk (8) is fixedly connected to a column cap (9), a tension spring (10) is provided between the column cap (9) and the sleeve (5), the valve body (1) is slidably connected to a limit block (11) through a fixing frame, a spring is provided between the limit block (11) and the fixing frame of the valve body (1), a locking assembly is provided on the side of the hinge arm (4) close to the pin shaft (3), and the locking assembly is used to stabilize the hinge arm (4) when the fluid fluctuates.

2. A swing check valve with a buffer structure according to claim 1, characterized in that: The material of the buffer disc (7) is rubber material.

3. The swing check valve with a buffer structure according to claim 1, characterized in that: A wedge-shaped surface (1101) is provided on the lower side of the limit block (11), and a shoulder is provided on the side of the shaft sleeve (5) away from the sealing disk (8). The shoulder of the shaft sleeve (5) pushes the limit block (11) to move via the wedge-shaped surface (1101). The limit block (11) is provided with a groove (1102) for limiting the shoulder of the shaft sleeve (5), and the groove (1102) is located on the upper side of the wedge-shaped surface (1101).

4. The swing check valve with a buffer structure according to claim 3, characterized in that: The limiting block (11) is provided with a guide protrusion (1103) located above the slot (1102), and the column cap (9) pushes the limiting block (111) to move by squeezing the guide protrusion (1103).

5. The swing check valve with a buffer structure according to claim 4, characterized in that: The distance between the guide protrusion (1103) and the lowermost side of the limit block (11) is less than the maximum distance that the column cap (9) deviates relative to the shaft sleeve (5) in the direction of the central axis of the shaft sleeve (5).

6. The swing check valve with a buffer structure according to claim 1, characterized in that: The locking assembly includes an insert rod (12), a blind hole is provided on a side of the hinge arm (4) close to the pin shaft (3), the insert rod (12) is slidably connected to the blind hole of the hinge arm (4), a compression spring (13) is provided between the insert rod (12) and the hinge arm (4), the compression spring (13) is located in the blind hole of the hinge arm (4), the pin shaft (3) is provided with a limiting hole for limiting the insert rod (12), and a connecting rope is provided between the insert rod (12) and the column cap (9) and passes through the hinge arm (4) and the shaft sleeve (5).

7. The swing check valve with a buffer structure according to claim 6, characterized in that: The valve body (1) further comprises a pressure-applying assembly, wherein the pressure-applying assembly is arranged on the upper side of the valve body (1), and the pressure-applying assembly is used to assist the valve flap (6) in closing quickly. The pressure-applying assembly comprises a sleeve (14), wherein the sleeve (14) is fixedly connected to and passes through the side of the valve body (1) close to the pin shaft (3), wherein a pressure plate (15) is slidably connected in the sleeve (14), wherein a spring is fixedly connected between the pressure plate (15) and the sleeve (14), and wherein a vent hole is provided on the side of the sleeve (14) away from the pressure plate (15), wherein the pin shaft (3) is rotatably connected to a symmetrically distributed rotating sleeve (16), wherein a first torsion spring is fixedly connected between the rotating sleeve (16) and the hinge arm (4), and wherein the symmetrically distributed rotating sleeves (16) are fixedly connected to a U-shaped frame (17), and a pull rope is fixedly connected between the U-shaped frame (17) and the pressure plate (15).

8. The swing check valve with a buffer structure according to claim 7, characterized in that: The diameter of the vent hole of the sleeve (14) is smaller than the inner diameter of the sleeve (14).

9. The swing check valve with a buffer structure according to claim 7, characterized in that: The valve body (1) is fixedly connected to a fixed rod (18), and the fixed rod (18) is rotatably connected to a rotating plate (19). A second torsion spring is provided between the fixed rod (18) and the rotating plate (19). The rotating plate (19) is fixedly connected to a limiting rod (20) on a side close to the pressure plate (15). The pressure plate (15) is fixedly connected to an intercepting plate (21) on a side close to the limiting rod (20). The intercepting plate (21) is provided with an intercepting hole. The limiting rod (20) is used to be inserted into the intercepting hole of the intercepting plate (21) and limit it. The hinge arm (4) is fixedly connected to a push rod (22) on a side close to the pin shaft (3). The rotating plate (19) is located on the rotation path of the push rod (22).

10. The swing check valve with a buffer structure according to claim 9, characterized in that: An inclined surface is provided on one side of the limiting rod (20) close to the pressure plate (15), and the intercepting plate (21) is pushed to move by the inclined surface of the limiting rod (20).

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