Check valve

Abstract

The invention relates to the technical field of valves, and discloses a check valve which comprises a valve body and a damping mechanism, a fluid channel is formed in the valve body, a plugging piece is rotationally arranged in the fluid channel and can rotate between a first rotating position and a second rotating position, and the plugging piece located at the first rotating position is suitable for cutting off the fluid channel; the plugging piece is suitable for being driven by fluid in the fluid channel in the first flowing direction to rotate towards the second rotating position so as to open the fluid channel. The damping mechanism is installed on the valve body so as to provide damping force for preventing the plugging piece from rotating from the first rotating position to the second rotating position. Damping force is applied to the plugging piece when the check valve is opened, so that the situation that the check valve and related parts deform due to the fact that the valve clack repeatedly impacts the valve body when fluid flows towards the fluid channel at low flow is reduced, meanwhile, the check valve can be slowly opened and rapidly closed, the plugging piece and the valve body are protected while the function of rapidly blocking fluid backflow is guaranteed, and the service life of the check valve is prolonged. And the service life of the check valve can be prolonged.

Description

Technical Field

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

[0002] The deaerator is one of the key equipment in the boiler and heating system of a thermal power plant. Since there is a large amount of heated saturated water in the deaerator, when the extraction pressure is lower than the saturated water pressure in the deaerator water tank, the deaerator will boil and flash to produce a large amount of steam, which will flow back along the pipeline into the extraction system and may also enter the steam turbine or the small steam turbine connected to the extraction system, causing cold steam to enter the steam turbine and the small steam turbine, endangering the safe operation of the unit.

[0003] In the related technology, a steam inlet check valve is generally provided on the deaerator steam inlet pipe to prevent low-temperature steam from flowing back into the steam extraction system. In daily use, when the steam flow rate changes, the valve disc of an ordinary check valve will repeatedly open and close due to inertia, especially during low flow periods, it will repeatedly hit the valve seat. Over time, the pin shaft, connecting bolts, etc. are prone to loosening and deformation, and misalignment will occur between the valve disc and the valve seat, resulting in a loose closure. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that the valve disc repeatedly hits the valve body during low flow, causing the check valve to deform and making it difficult to block the backflow of fluid. A check valve is provided, which has a damping force on the sealing member when it is opened, so as to reduce the situation in which the valve disc repeatedly hits the valve body when the fluid flows toward the fluid channel at low flow, causing the check valve and related components to be deformed. At the same time, the check valve can be opened slowly and closed quickly, thereby ensuring the function of quickly blocking the backflow of fluid and protecting the sealing member and the valve body, thereby extending the service life of the check valve.

[0005] In order to achieve the above-mentioned objectives, on the one hand, the present invention provides a check valve, including a valve body and a damping mechanism, a fluid channel is opened in the valve body, a blocking member is rotatably arranged in the fluid channel, the blocking member can rotate between a first rotation position and a second rotation position, the blocking member in the first rotation position is suitable for cutting off the fluid channel, and the blocking member is suitable for being driven by the fluid in the fluid channel along the first flow direction to rotate to the second rotation position to open the fluid channel; the damping mechanism is installed on the valve body to be able to provide a damping force to hinder the blocking member from rotating from the first rotation position to the second rotation position.

[0006] Preferably, the blocking member comprises a rotating shaft, a connecting rod and a valve flap, one end of the connecting rod is connected to the valve flap, and the other end is rotatably connected to the valve body via the rotating shaft, and the valve flap in the first rotating position is suitable for cutting off the fluid channel.

[0007] Preferably, the damping mechanism includes a damping cylinder, a piston head and a piston rod. The piston head can be slidably arranged in the damping cylinder to divide the chamber of the damping cylinder into a first chamber and a second chamber. A damping channel is arranged between the first chamber and the second chamber. One end of the piston rod is connected to the piston head, and the other end extends out of the damping cylinder to connect to the rotating shaft so that the rotating shaft can drive the valve disc to rotate.

[0008] Preferably, a transmission rocker arm is provided between the piston rod and the rotating shaft, one end of the transmission rocker arm is connected to the rotating shaft, and the other end of the transmission rocker arm is slidably connected to the piston rod.

[0009] Preferably, a flow hole for connecting the first chamber and the second chamber is formed on the piston head, and a floating member is slidably mounted on the rod body of the piston rod in the damping cylinder, and the floating member is suitable for abutting against the flow hole to form a blockage.

[0010] Preferably, the floating member comprises a floating ring and a flow-blocking pad, wherein the floating ring is sleeved on the piston rod, and the flow-blocking pad is arranged around the floating ring, and the flow-blocking pad is suitable for abutting against the flow hole to form a blockage.

[0011] Preferably, a damping regulating valve or a damping hole is provided on the damping channel.

[0012] Preferably, an indicator assembly is provided on the damping cylinder body, and a valve position indicator rod is connected to one end of the piston rod away from the piston head, and the valve position indicator rod is suitable for moving along the length direction of the indicator assembly to indicate the telescopic length of the piston rod.

[0013] Preferably, the indicating assembly includes an opening scale and two extreme limit blocks, the opening scale is fixed on the damping cylinder body, the two extreme limit blocks are fixed on the opening scale at intervals, the valve position indicating rod is suitable for moving between the two extreme limit blocks, and the valve position indicating rod is respectively located at the two extreme limit blocks to respectively indicate that the valve flap is in the first rotation position and the second rotation position.

[0014] Preferably, a handle is connected to the shaft body of the rotating shaft extending outside the valve body, and the handle is suitable for driving the rotating shaft to drive the blocking member to rotate.

[0015] Through the above technical scheme, a fluid channel is opened in the valve body for the fluid to flow in the forward direction. When the fluid flows in the reverse direction, the blocking member can cut off the fluid channel, thereby reducing the reverse flow of fluid such as steam into the steam extraction system and affecting the safe operation of the unit. At the same time, a damping mechanism is also provided on the valve body. The damping mechanism provides a damping force to prevent the blocking member from rotating from the first rotation position to the second rotation position, thereby reducing the possibility of the blocking member frequently and quickly opening under the impact of a small flow of fluid and colliding with the valve body, causing the check valve to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the swing check valve in the present invention;

[0017] Figure 2 is a cross-sectional view of the valve body with the blocking member in the first rotation position according to the present invention;

[0018] Figure 3 is a cross-sectional view of the valve body with the blocking member in the second rotation position according to the present invention;

[0019] Figure 4 is a cross-sectional view of the damping cylinder in the present invention;

[0020] Figure 5 yes Figure 4 A partial enlarged view of part A;

[0021] Figure 6 yes Figure 1 A partial enlarged view of part B.

[0022] Description of Reference Numerals

[0023] 1. Valve body; 2. Fluid channel; 3. Damping mechanism; 31. Damping cylinder; 311. First chamber; 312. Second chamber; 32. Piston head; 321. Flow hole; 33. Piston rod; 4. Sealing member; 41. Rotating shaft; 42. Connecting rod; 43. Valve disc; 5. Transmission rocker arm; 6. Floating member; 61. Floating ring; 62. Flow control pad; 7. Damping channel; 8. Damping regulating valve; 9. Indicator assembly; 91. Opening scale; 92. Extreme limit block; 10. Valve position indicator rod; 11. Handle; 12. Buffer ring; 13. Groove; 14. Buffer protrusion; 15. Lifting ring. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be abutment, it can be the internal connection of two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] It should be understood that the directions or positional relationships indicated by the terms "outside", "inside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] The present invention provides a check valve, comprising a valve body 1, Figure 1 and Figure 2 A fluid channel 2 is provided in the valve body 1, so that the fluid can pass through the valve body 1 through the fluid channel 2. At the same time, a blocking member 4 is rotatably connected in the fluid channel 2. The blocking member 4 can be in a first rotation position ( Figure 2 The rotation position shown) to the second rotation position ( Figure 3 The blocking member 4 in the first rotational position is suitable for blocking the fluid channel 2, and the blocking member 4 is suitable for being driven by the fluid in the fluid channel 2 along the first flow direction to rotate toward the second rotational position to open the fluid channel 2. For example, referring to Figure 2 and Figure 3 , when the fluid flows forward (first flow direction, Figure 2 and Figure 3 When the fluid passes through the check valve 2 (from right to left in the middle) and enters the fluid channel 2, the blocking member 4 is pushed by the fluid to rotate from the first rotation position to the second rotation position, and the fluid can pass through the check valve through the fluid channel 2; when the fluid does not flow or flows in the reverse direction, the blocking member 4 is not affected by the force of the forward flow. Under the action of gravity and / or the push of the reverse flow of the fluid, the blocking member 4 will rotate from the second rotation position to the first rotation position, thereby cutting off the fluid channel 2, and the pressure of the fluid will also act on the blocking member 4 to maintain it in the first rotation position, thereby improving reliability.

[0028] Reference Figure 2 and Figure 3The sealing member 4 includes a rotating shaft 41, a connecting rod 42 and a valve flap 43, wherein the rotating shaft 41 is rotatably connected to the valve body 1, one end of the rotating shaft 41 is placed in the valve body 1, and the other end of the rotating shaft 41 passes through and extends outside the valve body 1. The connection between the rotating shaft 41 and the valve body 1 is sealed to prevent fluid leakage in the fluid channel 2, and the valve flap 43 is connected to the rotating shaft 41 in the valve body 1 through the connecting rod 42. When no fluid enters the fluid channel 2, the valve flap 43 is placed in the first rotation position under the action of gravity to cut off the fluid channel 2. When the fluid flows forward and enters the fluid channel 2, the valve flap 43 is pushed by the fluid, the rotating shaft 41 rotates, and the valve flap 43 is rotated from the first rotation position to the second rotation position through the connecting rod 42. At this time, the fluid can pass through the check valve through the fluid channel 2; when the fluid does not flow or flows in the reverse direction, the valve flap 43 is rotated through the rotating shaft 41 under the action of gravity and / or the push of the reverse flowing fluid, and the valve flap 43 is rotated from the second rotation position to the first rotation position through the connecting rod 42, thereby cutting off the fluid channel 2.

[0029] In order to reduce the possibility that the valve flap 43 collides with the inside of the valve body 1 and causes the check valve to deform and fail, a buffer ring 12 and a buffer protrusion 14 are provided in the valve body 1. Specifically, the buffer ring 12 is placed in a first rotation position and is arranged around the fluid channel 2 of the valve body 1. The buffer ring 12 is an elastic member, which is preferably a rubber member. When no fluid enters the fluid channel 2, the valve flap 43 abuts against the buffer ring 12 to block the fluid channel 2. When the fluid flows in the opposite direction, the valve flap 43 rotates from the second rotation position to the first rotation position and abuts against the buffer ring 12. At this time, the buffer ring 12 abuts between the valve flap 43 and the valve body 1, and can absorb the kinetic energy of the valve flap 43 hitting the valve body 1 through elastic deformation, so as to reduce the possibility that the valve flap 43 hits the valve body 1 and causes the check valve to deform. The buffer protrusion 14 is arranged at the second rotation position. The buffer protrusion 14 is also an elastic member. When the fluid flows forward and enters the fluid channel 2, the valve flap 43 is pushed by the fluid to rotate from the first rotation position to the second rotation position and abuts against the buffer protrusion 14. At this time, the buffer protrusion 14 abuts between the valve flap 43 and the valve body 1, and can absorb the kinetic energy of the valve flap 43 hitting the valve body 1 through elastic deformation, so as to reduce the possibility of deformation of the check valve caused by the valve flap 43 hitting the valve body 1. In addition, see Figure 3 According to actual needs, a groove 13 can be further opened on the inner wall of the valve body 1 to form an escape space during the rotation of the blocking member 4, which can reduce the friction or collision between the valve disc 43 and the valve body 1 when the blocking member 4 rotates, resulting in deformation.

[0030] In actual use, when the flow rate of the fluid channel 2 is low, the blocking member 4 may repeatedly rotate between the first rotation position and the second rotation position, causing the blocking member 4 to repeatedly hit the valve body 1, reducing the service life. Figure 4 and Figure 5 The check valve of the present invention is provided with a damping mechanism 3 on the valve body 1, and the damping mechanism 3 can provide a damping force to prevent the blocking member 4 from rotating from the first rotation position to the second rotation position, thereby reducing the possibility that the blocking member 4 is frequently and quickly opened under the impact of a small flow fluid and collides with the valve body, causing the check valve to deform. The damping mechanism 3 can be remotely controlled or logically controlled by an electric, pneumatic or hydraulic operating mechanism equipped with a control module and control logic. In one embodiment of the present invention, the damping mechanism 3 includes a damping cylinder 31, a piston head 32 and a piston rod 33. The damping cylinder 31 is mounted on the valve body 1, and a damping medium is injected into the damping cylinder 31, which can be hydraulic oil or inert gas. The piston head 32 is arranged in the damping cylinder 31, and the periphery of the piston head 32 abuts against the inner wall of the damping cylinder 31, dividing the chamber of the damping cylinder 31 into a first chamber 311 and a second chamber 312, and the piston head 32 can slide from the first chamber 311 to the second chamber 312 or from the second chamber 312 to the first chamber 311. Figure 6 One end of the piston rod 33 is fixed on the piston head 32, and the other end of the piston rod 33 passes through and extends outside the damping cylinder 31. The end of the piston rod 33 away from the piston head 32 is connected to the rotating shaft 41 through the transmission rocker 5, one end of the transmission rocker 5 is slidably connected to the piston rod 33, and the other end of the transmission rocker 5 is connected to the rotating shaft 41. When the blocking member 4 rotates between the first rotation position and the second rotation position, the rotating shaft 41 rotates and drives the piston rod 33 to move along the height direction of the damping cylinder 31 through the transmission rocker 5. At this time, the connection between the transmission rocker 5 and the piston rod 33 can slide on the transmission rocker 5, and the rotational motion of the rotating shaft 41 can be transmitted to the linear motion of the piston rod 33, so that the damping mechanism 3 can apply a damping force to the blocking member 4 through the transmission rocker 5, so as to reduce the repeated rotation of the blocking member 4 between the first rotation position and the second rotation position, thereby improving the service life.

[0031] Reference Figures 4 to 6, a damping channel 7 is connected between the first chamber 311 and the second chamber 312, and the damping medium can flow between the first chamber 311 and the second chamber 312 along the damping channel 7. When the fluid flows forward and enters the fluid channel 2, the valve flap 43 is pushed by the fluid, the rotating shaft 41 rotates, and the transmission rocker arm 5 transmits the rotational motion of the rotating shaft 41 into a linear motion of the piston rod 33 along the height direction of the damping cylinder 31, so that the piston head 32 slides from the second chamber 312 to the first chamber 311. At this time, the damping medium in the first chamber 311 flows to the second chamber 312 through the damping channel 7 to form a damping force, reducing the sliding speed of the piston head 32 in the damping cylinder 31, and then through the piston rod 33, the transmission rocker arm 5, the rotating shaft 41 and the connecting rod 42 to reduce the speed of the valve flap 43 rotating from the first rotation position to the second rotation position. On the one hand, it can reduce the situation that the valve flap 43 impacts the valve body 1, causing the check valve to deform and fail. On the other hand, by applying a damping force to the blocking member 4 through the damping mechanism 3, when the slow opening function of the check valve is realized, when the thrust of the fluid on the valve flap 43 is lower than the damping force applied by the damping mechanism 3 to the blocking member 4, the valve flap 43 always abuts against the buffer ring 12, and it can also reduce the situation that the valve flap 43 repeatedly impacts the valve body 1 when the fluid flows toward the fluid channel 2 at low flow, causing the check valve to deform. Compared with electric, pneumatic or hydraulic operating mechanisms equipped with control modules and control logic to achieve remote control or logic control, the damping mechanism 3 composed of the damping cylinder 31, the piston head 32 and the piston rod 33 has a simple structure, is not easy to damage and is easy to maintain.

[0032] See also Figures 4 to 5A plurality of flow holes 321 connecting the first chamber 311 and the second chamber 312 are provided on the piston head 32, and a floating member 6 is provided in the damping cylinder 31. The floating member 6 includes a floating ring 61 sleeved on the piston rod 33, and also includes a flow blocking pad 62 arranged around the floating ring 61. The floating ring 61 can slide along the length direction of the piston rod 33. When the floating ring 61 abuts against the piston head 32, the flow blocking pad 62 abuts against the flow hole 321 to form a blockage. When the fluid flows forward and enters the fluid channel 2, when the piston head 32 slides from the second chamber 312 toward the first chamber 311, when the floating ring 61 abuts against the piston head 32, the flow blocking pad 62 abuts against the flow hole 321 to form a blockage, so that the damping medium can only flow from the first chamber 311 to the second chamber 312 along the damping channel 7 under the push of the piston head 32 and the flow blocking pad 62, and the damping medium exerts a reverse force on the piston head 32 and the flow blocking pad 62, thereby further reducing the speed at which the piston head 32 slides from the second chamber 312 toward the first chamber 311, and further reducing the speed at which the blocking member 4 rotates from the first rotation position to the second rotation position under the transmission of the piston rod 33 and the transmission rocker arm 5, so as to enhance the slow opening function of the check valve, further enhance the thrust required for the fluid to push open the valve flap 43, so as to reduce the situation in which the valve flap 43 repeatedly hits the valve body 1 when the fluid flows toward the fluid channel 2 at low flow rate, causing deformation of the check valve, and extend the service life of the check valve.

[0033] When the fluid flows in the reverse direction and enters the fluid channel 2, the piston head 32 slides from the first chamber 311 to the second chamber 312, and the floating ring 61 is pushed by the damping medium to separate from the piston head 32. At this time, the flow blocking pad 62 slides with the floating ring 61 and does not abut on the flow hole 321. In addition to flowing from the second chamber 312 to the first chamber 311 along the damping channel 7 under the push of the piston head 32, the damping medium can also flow from the second chamber 312 to the first chamber 311 through the flow hole 321, which can reduce the piston head 32 from the first chamber 311 to the second chamber 312. The resistance encountered when the second chamber 312 slides toward the first chamber 311, and the damping medium flowing into the second chamber 312 can generate thrust on the piston head 32, thereby further increasing the speed of the piston head 32 sliding from the second chamber 312 toward the first chamber 311, and then increasing the speed of the blocking member 4 rotating from the second rotation position to the first rotation position under the transmission of the piston rod 33 and the transmission rocker arm 5, so as to realize the quick closing function of the check valve, which helps to reduce the situation where the fluid flows back into the fluid channel 2 and passes through the check valve. A damping regulating valve 8 or a damping hole is also provided on the damping channel 7. In one embodiment of the present invention, taking the damping regulating valve 8 as an example, the slow opening damping is adjusted by the flow rate of the damping regulating valve 8 or the damping hole, and adaptive adjustment can be made according to actual usage.

[0034] Reference Figure 1 and Figure 6The damping cylinder 31 is provided with an indication assembly 9, and the piston rod 33 is provided with a valve position indication rod 10 used in conjunction with the indication assembly 9. The indication assembly 9 includes an opening scale 91 and two extreme limit blocks 92, wherein the opening scale 91 is fixed on the damping cylinder 31 and extends along the height direction of the damping cylinder 31, and the extreme limit blocks 92 are all fixed on the opening scale 91, and the opening scale 91 between the two extreme limit blocks 92 has a measuring scale. The valve position indication rod 10 is fixed on the piston rod 33 outside the damping cylinder 31. When the valve disc 43 abuts on the buffer ring 12, the valve position indication rod 10 tends to abut on one extreme limit block 92, and when the valve disc 43 abuts on the buffer protrusion 14, the valve position indication rod tends to abut on the other extreme limit block 92, so that the indication assembly 9 and the valve position indication rod 10 can indicate the opening of the check valve.

[0035] At the same time, the distance between the two extreme limit blocks 92 is smaller than the distance between the connection point between the damping channel 7 and the first chamber 311 and the connection point between the damping channel 7 and the second chamber 312, so that the indicating assembly 9 and the valve position indicating rod 10 can also limit the piston rod 33, and then limit the piston head 32, so as to reduce the possibility that the piston head 32 slides to the connection point between the damping channel 7 and the first chamber 311 facing away from the second chamber 312 or the connection point between the damping channel 7 and the second chamber 312 facing away from the first chamber 311, resulting in the failure of the damping mechanism 3. It should be noted that the movement range of the piston head 32 driven by the blocking member 4 in the first rotation position and the second rotation position should be between the two extreme limit blocks 92.

[0036] Reference Figure 1 The rotating shaft 41 extends to the shaft outside the valve body 1 and is connected to a handle 11. The handle 11 can be turned to manually open or close the check valve or to check the rotation of the blocking member 4, which is convenient for manually operating the check valve and inspecting and repairing the check valve. A lifting ring 15 is also provided on the top of the valve body 1 to facilitate transportation of the check valve or lifting the check valve for maintenance.

[0037] The present invention provides a check valve, comprising a valve body 1, a fluid channel 2 is provided in the valve body 1, a blocking member 4 is rotatably provided in the fluid channel 2, the blocking member 4 comprises a rotating shaft 41 rotatably connected to the valve body 1 and a valve flap 43 connected to the rotating shaft 41 through a connecting rod 42, and the valve flap 43 can rotate between a first rotating position and a second rotating position in the valve body 1. The present invention also comprises a damping mechanism 3, the damping mechanism 3 comprises a damping cylinder 31 provided on the valve body 1, a piston head 32 is slidably provided in the damping cylinder 31 and divides the damping cylinder 31 into a first chamber 311 and a second chamber 312, a flow hole 321 is provided on the piston head 32 for connecting the first chamber 311 and the second chamber 312, a piston rod 33 is connected to the piston head 32, one end of the piston rod 33 away from the piston head 32 is connected to the rotating shaft 41 through a transmission rocker 5, one end of the transmission rocker 5 is slidably connected to the piston rod 33, and the other end of the transmission rocker 5 is connected to the rotating shaft 41. A floating member 6 is slidably mounted on the piston rod 33. The floating member 6 includes a floating ring 61 slidably mounted on the piston rod 33 and a flow-blocking pad 62 arranged around the floating ring 61. A damping channel 7 is also provided on the damping cylinder 31. The damping channel 7 connects the first chamber 311 and the second chamber 312. A damping regulating valve 8 or a damping hole is provided on the damping channel 7. An indicating assembly 9 consisting of an opening scale 91 and an extreme limit block 92 is connected to the damping cylinder 31. The opening scale 91 is fixed on the damping cylinder 31. Two extreme limit blocks 92 are both fixed on the opening scale 91. A valve position indicating rod 10 used in combination with the indicating assembly 9 is fixed on the piston rod 33.

[0038] In summary, a check valve of the present invention has the following advantages: when no fluid flows through the fluid channel 2, the valve disc 43 is blocked against the buffer ring 12, and the fluid channel 2 is cut off, and the check valve is in a closed state. When the fluid enters the fluid channel 2 in the forward direction, the fluid applies thrust to the valve disc 43, and the rotating shaft 41 rotates at this time, and the transmission rocker arm 5 transmits the rotational motion of the rotating shaft 41 into a linear motion of the piston rod 33 along its own length direction, so that the piston head 32 slides from the second chamber 312 to the first chamber 311, and the flow blocking pad 62 is pressed against the piston head 32 to form a blockage on the flow hole 321, so that the damping medium can only flow slowly from the first chamber 311 through the damping channel 7 into the second chamber 312, and the damping medium generates a damping force through the damping regulating valve 8 or the damping hole, thereby slowing down the rotation speed of the rotating shaft 41, and then slowing down the rotation speed of the valve disc 43 from the first rotation position to the second rotation position, so as to realize the function of the check valve to open slowly. When the fluid flow rate is low, the thrust of the fluid on the valve flap 43 is difficult to overcome the resistance of the damping mechanism 3 to the valve flap 43, which can reduce the possibility of deformation of the check valve caused by frequent opening and closing of the blocking member 4 and collision with the valve body 1. When the fluid flow rate is large, the valve flap 43 rotates to the second rotation position and abuts against the buffer protrusion 14, which absorbs the kinetic energy of the valve flap 43 hitting the valve body 1 through elastic deformation to reduce the possibility of deformation of the check valve caused by the valve flap 43 hitting the valve body 1. At the same time, the valve position indicator rod 10 moves with the piston rod 33 between the two extreme limit blocks 92 on the opening scale 91, which can indicate the opening of the check valve, and then the size of the slow opening damping force can be adjusted through the damping regulating valve 8.

[0039] When the fluid enters the fluid channel 2 in the reverse direction, the valve disc 43 rotates from the second rotation position to the first rotation position under the action of the fluid thrust and its own gravity to cut off the fluid channel 2. At this time, the rotating shaft 41 rotates, and the transmission rocker arm 5 transmits the rotational motion of the rotating shaft 41 into a linear motion of the piston rod 33 along its own length direction, so that the piston head 32 slides from the first chamber 311 toward the second chamber 312. The flow blocking pad 62 is separated from the piston head 32 under the push of the damping medium. Therefore, the damping medium can not only flow slowly from the second chamber 312 into the first chamber 311 through the damping channel 7, but also flow from the second chamber 312 into the first chamber 311 through the flow hole 321, thereby reducing the resistance generated by the damping mechanism 3 to the blocking member 4, so that the blocking member 4 can quickly rotate from the second position to the first rotation position to cut off the fluid channel 2, so as to realize the quick closing function of the check valve. When the blocking member 4 rotates to the first rotation position, the valve flap 43 abuts against the buffer ring 12 , and the buffer ring 12 absorbs the kinetic energy of the valve flap 43 hitting the valve body 1 to reduce the possibility of deformation of the check valve caused by the valve flap 43 hitting the valve body 1 .

[0040] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0042] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A check valve, characterized in that: The invention comprises a valve body (1) and a damping mechanism (3), wherein a fluid channel (2) is provided in the valve body (1), a blocking member (4) is rotatably arranged in the fluid channel (2), and the blocking member (4) is rotatable between a first rotation position and a second rotation position, wherein the blocking member (4) in the first rotation position is suitable for blocking the fluid channel (2), and the blocking member (4) is suitable for being driven by the fluid in the fluid channel (2) along the first flow direction to rotate toward the second rotation position so as to open the fluid channel (2); The damping mechanism (3) is mounted on the valve body (1) so as to provide a damping force that hinders the blocking member (4) from rotating from the first rotation position to the second rotation position.

2. The check valve according to claim 1, characterized in that: The blocking member (4) comprises a rotating shaft (41), a connecting rod (42) and a valve flap (43); one end of the connecting rod (42) is connected to the valve flap (43), and the other end is rotatably connected to the valve body (1) via the rotating shaft (41); the valve flap (43) in the first rotational position is suitable for blocking the fluid channel (2).

3. The check valve according to claim 2, characterized in that: The damping mechanism (3) comprises a damping cylinder (31), a piston head (32) and a piston rod (33); the piston head (32) is slidably arranged in the damping cylinder (31) to divide the chamber of the damping cylinder (31) into a first chamber (311) and a second chamber (312); a damping channel (7) is arranged between the first chamber (311) and the second chamber (312); one end of the piston rod (33) is connected to the piston head (32), and the other end extends out of the damping cylinder (31) to be connected to the rotating shaft (41), so as to drive the rotating shaft (41) to drive the valve flap (43) to rotate.

4. The check valve according to claim 3, characterized in that: A transmission rocker arm (5) is provided between the piston rod (33) and the rotating shaft (41); one end of the transmission rocker arm (5) is connected to the rotating shaft (41), and the other end of the transmission rocker arm (5) is slidably connected to the piston rod (33).

5. The check valve according to claim 3, characterized in that: The piston head (32) is provided with a flow hole (321) for connecting the first chamber (311) and the second chamber (312); the piston rod (33) is located in the damping cylinder body (31) and a floating member (6) is slidably mounted on the rod body; the floating member (6) is suitable for abutting against the flow hole (321) to form a blockage.

6. The check valve according to claim 5, characterized in that: The floating member (6) comprises a floating ring (61) and a flow-blocking pad (62); the floating ring (61) is sleeved on the piston rod (33); the flow-blocking pad (62) is arranged around the floating ring (61); and the flow-blocking pad (62) is suitable for abutting against the flow hole (321) to form a blockage.

7. The check valve according to claim 3, characterized in that: The damping channel (7) is provided with a damping regulating valve (8) or a damping hole.

8. The check valve according to claim 3, characterized in that: The damping cylinder (31) is provided with an indicating assembly (9), and one end of the piston rod (33) away from the piston head (32) is connected to a valve position indicating rod (10), and the valve position indicating rod (10) is suitable for moving along the length direction of the indicating assembly (9) to indicate the telescopic length of the piston rod (33).

9. The check valve according to claim 8, characterized in that: The indicating assembly (9) comprises an opening scale (91) and two extreme limit blocks (92); the opening scale (91) is fixed on the damping cylinder (31); the two extreme limit blocks (92) are fixed on the opening scale (91) at intervals; the valve position indicating rod (10) is suitable for moving between the two extreme limit blocks (92); and the valve position indicating rod (10) is respectively located at the two extreme limit blocks (92) to respectively indicate that the valve flap (43) is in the first rotation position and the second rotation position.

10. The check valve according to claim 2, characterized in that: The rotating shaft (41) extends to the shaft outside the valve body (1) and is connected to a handle (11). The handle (11) is suitable for driving the rotating shaft (41) to drive the blocking member (4) to rotate.

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