A large-diameter cryogenic check valve

Abstract

The present invention relates to the field of check valves and provides a large-diameter cryogenic check valve, which includes a valve body. A valve cavity and a damping cavity are formed inside the valve body. The valve cavity is communicated with the outer wall of the valve body through a water inlet channel, and the valve cavity is communicated with the outer wall of the valve body through a water outlet channel. The inner wall of the damping cavity is communicated with the inner wall of the water outlet channel through a liquid passing channel. A valve state recording component is arranged inside the valve body. The valve state recording component includes a temperature detection unit, a flow rate detection unit and a wireless module. The temperature detection unit and the flow rate detection unit are electrically connected to the wireless module respectively. A rotating shaft is rotatably connected to the inner wall of the valve cavity. A rotating handle is fixedly connected to the rotating shaft. A valve flap is fixedly connected to the rotating handle. A transmission groove is formed in the valve flap. The transmission groove is communicated with the outer wall of the valve flap through a strip channel. A wedge-shaped strip is slidably connected to the inner wall of the strip channel, and the wedge-shaped strip extends into the transmission groove. The present invention can generate damping for the valve flap, so that the reset process of the valve flap proceeds slowly, preventing the valve flap from resetting too fast and causing water hammer phenomenon to damage the check valve.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and more particularly to a large-diameter cryogenic check valve. Background Art

[0002] A check valve is an automatic valve mainly used to prevent the backflow of media and protect pipelines, pumps, and other equipment. According to different classification criteria, check valves can be divided into the following categories: lift check valves, swing check valves, butterfly check valves, diaphragm check valves, and ball check valves.

[0003] In a swing check valve, if the valve flap closes too quickly after the medium stops entering the check valve, a water hammer phenomenon will occur, which may damage the check valve. Summary of the Invention

[0004] In view of the above technical problems, the present invention aims to provide a large-diameter cryogenic check valve. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A large-diameter cryogenic check valve includes a valve body. A valve cavity and a damping cavity are formed in the valve body. The valve cavity communicates with the outer wall of the valve body through an inlet channel and an outlet channel. The inner wall of the damping cavity communicates with the inner wall of the outlet channel through a liquid passage. A valve state recording component is provided in the valve body. The valve state recording component includes a temperature detection unit, a flow rate detection unit, and a wireless module. The temperature detection unit and the flow rate detection unit are electrically connected to the wireless module respectively;

[0006] A rotating shaft is rotatably connected to the inner wall of the valve cavity. A rotating handle is fixedly connected to the rotating shaft. A valve flap is fixedly connected to the rotating handle. A transmission groove is formed in the valve flap. The transmission groove communicates with the outer wall of the valve flap through a strip channel. A wedge-shaped strip is slidably connected to the inner wall of the strip channel. The wedge-shaped strip extends into the transmission groove. The wedge-shaped strip is connected to the inner wall of the transmission groove through a first spring. An L-shaped locking rod is slidably connected to the inner wall of the transmission groove. A wedge-shaped block is fixedly connected to the L-shaped locking rod. The wedge-shaped block abuts against the wedge-shaped strip. The L-shaped locking rod is connected to the inner wall of the transmission groove through a second spring. The L-shaped locking rod extends out of the transmission groove. A mass plate is slidably connected to the inner wall of the damping cavity. A transmission line is fixedly connected to the mass plate. A reversing wheel is rotatably connected to the inner wall of the damping cavity. One end of the transmission line extends into the valve cavity after being guided by the reversing wheel. One end of the transmission line located in the valve cavity is fixedly connected to a driven strip. A limiting piece is fixedly connected to the driven strip. A locking piece is rotatably connected to the driven strip. The locking piece abuts against the limiting piece. The locking piece is connected to the driven strip through a torsion spring.

[0007] Further, a first permanent magnet is embedded in the valve flap. A magnet cavity and a device cavity are formed in the valve body. A second permanent magnet is slidably connected to the inner wall of the magnet cavity. A thermal expansion member is fixedly connected to the inner wall of the magnet cavity. The thermal expansion member is fixedly connected to the second permanent magnet. A heater is fixedly connected to the inner wall of the device cavity. A heat conduction strip is fixedly connected to the heater. The heat conduction strip is in a C shape. One end of the heat conduction strip extends into the magnet cavity and abuts against the thermal expansion member. The other end of the heat conduction strip extends into the valve cavity and abuts against the rotating shaft.

[0008] Further, a button is movably connected to the heater. A first airbag is fixedly connected to the inner wall of the device cavity. The first airbag abuts against the button. A second airbag is fixedly connected to the inner wall of the water inlet channel. The second airbag is connected to the first airbag through an air pipe. A pressing piece is rotatably connected to the inner wall of the water inlet channel. The pressing piece is fixedly connected to the second airbag.

[0009] Further, a lubricant adding box is fixedly connected in the valve body.

[0010] Further, a floating groove, a floating cavity and a storage cavity are formed in the lubricant adding box. A limiting block is fixedly connected to the inner wall of the floating groove. A first floating block is slidably connected to the inner wall of the floating groove. The first floating block abuts against the limiting block. A liquid transmission channel is formed in the first floating block. The floating groove is communicated with the floating cavity through a liquid passing channel. A second floating block is slidably connected to the inner wall of the floating cavity. A connecting strip is fixedly connected to the second floating block. The upper end of the connecting strip extends to the inner wall of the storage cavity. A conduction block is slidably connected to the inner wall of the storage cavity. The conduction block is fixedly connected to the connecting strip and the limiting block. A lubricant guiding channel is formed in the conduction block. An agent outlet pipe is fixedly connected to the inner wall of the storage cavity. A main channel is formed in the agent outlet pipe. The main channel communicates with the bottom wall of the agent outlet pipe. The main channel is communicated with the outer wall of the agent outlet pipe through two or more branch channels. The lower end of the agent outlet pipe extends into the valve cavity. The lower end of the agent outlet pipe abuts against the rotating shaft. The storage cavity is filled with lubricant.

[0011] Further, a sealing ring is embedded in the valve flap.

[0012] Further, a heat conduction groove is formed in the heat conduction strip. The inner wall of the heat conduction groove abuts against the rotating shaft.

[0013] Further, the floating cavity is connected to the inner wall of the valve cavity through an electric valve.

[0014] Further, two or more buffer soft sheets are fixedly connected to the inner wall of the damping cavity.

[0015] Further, the temperature detection unit includes a temperature sensor, and the flow rate detection unit includes a liquid flow meter.

[0016] The present invention has the following beneficial effects:

[0017] After the liquid in the present invention pushes the valve flap to rotate, the L-shaped locking rod can automatically engage with the locking piece and the driven bar, and the valve flap is damped by the combined action of the gravity of the mass plate, the resistance of the liquid in the damping cavity, and the resistance of the buffer soft film, so that the reset process of the valve flap proceeds slowly, preventing the water hammer phenomenon caused by the too-fast reset of the valve flap from damaging the check valve and improving the service life of the check valve. Brief Description of the Drawings

[0018] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the following drawings without creative efforts.

[0019] Figure 1 is a schematic structural view of a large-diameter cryogenic check valve of the present invention;

[0020] Figure 2 is a front view of a large-diameter cryogenic check valve of the present invention;

[0021] Figure 3 is the present invention Figure 2 an enlarged view of part A in;

[0022] Figure 4 is the present invention Figure 2 an enlarged view of part B in;

[0023] Figure 5 is the present invention Figure 2 an enlarged view of part C in;

[0024] Figure 6 is the present invention Figure 2 an enlarged view of part D in;

[0025] Figure 7 is the present invention Figure 1 a schematic structural view of the wedge block and the L-shaped locking rod in.

[0026] Reference numerals: 1, valve body; 2, water inlet channel; 3, water outlet channel; 4, valve cavity; 5, turning handle; 6, rotating shaft; 7, valve flap; 8, transmission groove; 9, strip channel; 10, wedge strip; 11, first spring; 12, wedge block; 13, L-shaped locking rod; 14, second spring; 15, driven strip; 16, limiting piece; 17, locking piece; 18, torsion spring; 19, transmission line; 20, mass plate; 21, reversing wheel; 22, buffer soft sheet; 23, damping cavity; 24, liquid passing channel; 25, sealing ring; 26, first permanent magnet; 27, second permanent magnet; 28, thermal expansion part; 29, magnet cavity; 30, heat conducting strip; 31, heater; 32, button; 33, device cavity; 34, first airbag; 35, air pipe; 36, second airbag; 37, pressing piece; 38, heat conducting groove; 39, floating groove; 40, floating cavity; 41, liquid passing through channel; 42, agent storage cavity; 43, limiting block; 44, first floating block; 45, liquid transmission channel; 46, second floating block; 47, connecting strip; 48, conducting block; 49, agent guiding channel; 50, agent outlet pipe; 51, main channel; 52, branch channel; 53, lubricant; 54, lubricant adding tank; 55, electric valve. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 to the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] As shown Figure 1-7 in the figure, a large-diameter cryogenic check valve includes a valve body 1. A valve cavity 4 and a damping cavity 23 are formed inside the valve body 1. The valve cavity 4 is communicated with the outer wall of the valve body 1 through a water inlet channel 2, and the valve cavity 4 is communicated with the outer wall of the valve body 1 through a water outlet channel 3. The inner wall of the damping cavity 23 is communicated with the inner wall of the water outlet channel 3 through a liquid passing channel 24. A valve state recording component is provided inside the valve body 1. The valve state recording component includes a temperature detection unit, a flow detection unit, and a wireless module. The temperature detection unit and the flow detection unit are respectively electrically connected to the wireless module; the wireless module is a module that can transmit and receive wireless signals and is the core component for the check valve to achieve remote interaction. The diameter of the water inlet channel 2 is the nominal diameter of the check valve, and the nominal diameter can be set to 50 to 600 millimeters, that is, the nominal diameter standard of the large-diameter check valve.

[0031] A rotating shaft 6 is rotatably connected to the inner wall of the valve cavity 4. A rotating handle 5 is fixedly connected to the rotating shaft 6. A valve flap 7 is fixedly connected to the rotating handle 5. A transmission groove 8 is formed on the valve flap 7. The transmission groove 8 is communicated with the outer wall of the valve flap 7 through a strip channel 9. A wedge strip 10 is slidably connected to the inner wall of the strip channel 9. The wedge strip 10 extends into the transmission groove 8. The wedge strip 10 is connected to the inner wall of the transmission groove 8 through a first spring 11. An L-shaped locking rod 13 is slidably connected to the inner wall of the transmission groove 8. A wedge block 12 is fixedly connected to the L-shaped locking rod 13. The wedge block 12 abuts against the wedge strip 10. The L-shaped locking rod 13 is connected to the inner wall of the transmission groove 8 through a second spring 14. The L-shaped locking rod 13 extends outside the transmission groove 8. A mass plate 20 is slidably connected to the inner wall of the damping cavity 23. A transmission wire 19 is fixedly connected to the mass plate 20. The transmission wire 19 can be made of plastic. A reversing wheel 21 is rotatably connected to the inner wall of the damping cavity 23. One end of the transmission wire 19 extends into the valve cavity 4 after being guided by the reversing wheel 21. One end of the transmission wire 19 located in the valve cavity 4 is fixedly connected to a driven strip 15. A limiting piece 16 is fixedly connected to the driven strip 15. A locking piece 17 is rotatably connected to the driven strip 15. The locking piece 17 abuts against the limiting piece 16. The locking piece 17 is connected to the driven strip 15 through a torsion spring 18. The valve flap 7 is used to block the water inlet channel 2.

[0032] As Figure 5-6As shown, in an alternative embodiment of the present invention, a first permanent magnet 26 is embedded in the valve flap 7. A magnet cavity 29 and a device cavity 33 are formed in the valve body 1. A second permanent magnet 27 is slidably connected to the inner wall of the magnet cavity 29. A thermal expansion member 28 is fixedly connected to the inner wall of the magnet cavity 29. The thermal expansion member 28 and the second permanent magnet 27 are fixedly connected. A heater 31 is fixedly connected to the inner wall of the device cavity 33. A heat conduction bar 30 is fixedly connected to the heater 31. The heat conduction bar 30 is in a U shape. One end of the heat conduction bar 30 extends into the magnet cavity 29 and abuts against the thermal expansion member 28. The other end of the heat conduction bar 30 extends into the valve cavity 4 and abuts against the rotating shaft 6. The thermal expansion member 28 is a component with a very high degree of thermal expansion and contraction. The heat conduction bar 30 can be made of metal copper. After the heater 31 is started, it can generate heat.

[0033] As Figure 5 As shown, in an alternative embodiment of the present invention, a button 32 is movably connected to the heater 31. A first airbag 34 is fixedly connected to the inner wall of the device cavity 33. The first airbag 34 abuts against the button 32. A second airbag 36 is fixedly connected to the inner wall of the water inlet passage 2. The second airbag 36 is connected to the first airbag 34 through an air tube 35. A pressing piece 37 is rotatably connected to the inner wall of the water inlet passage 2. The pressing piece 37 is fixedly connected to the second airbag 36. Both the first airbag 34 and the second airbag 36 are filled with gas, and the gas can be transmitted through the air tube 35.

[0034] As Figure 6 As shown, in an alternative embodiment of the present invention, a lubricant adding box 54 is fixedly connected in the valve body 1. The lubricant adding box 54 is used to add lubricant 53 to the rotating shaft 6.

[0035] As Figure 6As shown, in an alternative embodiment of the present invention, a floating groove 39, a floating chamber 40, and a storage chamber 42 are formed on the lubricant addition tank 54. A limiting block 43 is fixedly connected to the inner wall of the floating groove 39. A first floating block 44 is slidably connected to the inner wall of the floating groove 39. The first floating block 44 abuts against the limiting block 43. A liquid transmission channel 45 is formed on the first floating block 44. The floating groove 39 communicates with the floating chamber 40 through a liquid passing channel 41. A second floating block 46 is slidably connected to the inner wall of the floating chamber 40. A connecting bar 47 is fixedly connected to the second floating block 46. The upper end of the connecting bar 47 extends to the inner wall of the storage chamber 42. A conduction block 48 is slidably connected to the inner wall of the storage chamber 42. The conduction block 48 is fixedly connected to the connecting bar 47 and the limiting block 43. A lubricant guiding channel 49 is formed on the conduction block 48. An outlet pipe 50 is fixedly connected to the inner wall of the storage chamber 42. A main channel 51 is formed on the outlet pipe 50. The main channel 51 communicates with the bottom wall of the outlet pipe 50. The main channel 51 communicates with the outer wall of the outlet pipe 50 through two or more branch channels 52. The lower end of the outlet pipe 50 extends into the valve chamber 4, and the lower end of the outlet pipe 50 abuts against the rotating shaft 6. The storage chamber 42 is filled with a lubricant 53. The lubricant 53 can be a low-temperature resistant lubricant. Both the first floating block 44 and the second floating block 46 can adopt a hollow structure to easily float on the liquid.

[0036] As Figure 5 shown, in an alternative embodiment of the present invention, a sealing ring 25 is inlaid on the valve flap 7. The sealing ring 25 can improve the sealing performance of the valve flap 7 and further prevent dripping.

[0037] As Figure 6 shown, in an alternative embodiment of the present invention, a heat conduction groove 38 is formed on the heat conduction strip 30. The inner wall of the heat conduction groove 38 abuts against the rotating shaft 6. The shape of the heat conduction groove 38 is adapted to the rotating shaft 6, so that the rotating shaft 6 will not be blocked during rotation and can receive heat normally.

[0038] As Figure 6 shown, in an alternative embodiment of the present invention, the floating chamber 40 is connected to the inner wall of the valve chamber 4 through an electric valve 55. The electric valve 55 can be used to drain the liquid in the floating chamber 40.

[0039] As Figure 2 shown, in an alternative embodiment of the present invention, two or more buffer soft sheets 22 are fixedly connected to the inner wall of the damping chamber 23. The buffer soft sheets 22 can increase the resistance when the valve flap 7 resets.

[0040] In an alternative embodiment of the present invention, the temperature detection unit includes a temperature sensor, which can be a thermocouple temperature sensor or a thermistor temperature sensor. The flow rate detection unit includes a liquid flowmeter, which can adopt an electromagnetic flowmeter.

[0041] Implementation process: Connect and install the valve body 1 and the pipeline. In the initial state, the first permanent magnet 26 and the second permanent magnet 27 are magnetically connected, the valve flap 7 abuts against the inner wall of the valve chamber 4, thereby blocking the water inlet channel 2, the mass plate 20 abuts against the bottom wall of the damping chamber 23, and the driven strip 15 abuts against the inner wall of the valve chamber 4.

[0042] Liquid enters the water inlet channel 2. The liquid flowmeter records the flow data of the liquid, and the temperature sensor records the temperature data inside the valve chamber 4. The flow data and temperature data are transmitted to the external terminal device through the wireless module for the user's reference.

[0043] The liquid pushes the pressing piece 37 to rotate counterclockwise, thereby flattening the second airbag 36. The gas in the second airbag 36 enters the first airbag 34 through the air pipe 35, so that the first airbag 34 expands. The expansion of the first airbag 34 presses the button 32, thereby controlling the heater 31 to heat for a period of time and then stop heating. The heat conducting strip 30 is heated and its temperature rises, and the thermal expansion part 28 expands when heated. The thermal expansion part 28 pushes the second permanent magnet 27 to move upward, thereby releasing the magnetic connection between the second permanent magnet 27 and the first permanent magnet 26, making it easier for the valve flap 7 to rotate. The heat conducting strip 30 transfers heat to the rotating shaft 6 to prevent the rotating shaft 6 from freezing and being difficult to rotate in a super-low temperature environment.

[0044] The liquid pushes the valve flap 7, causing the valve flap 7, the turning handle 5, and the rotating shaft 6 to rotate counterclockwise. After the wedge-shaped strip 10 loses the support of the inner wall of the valve chamber 4, the left end of the wedge-shaped strip 10 extends outside the valve flap 7 under the elastic force of the first spring 11. The wedge-shaped block 12 and the L-shaped locking rod 13 move upward under the elastic force of the second spring 14. The liquid enters the valve chamber 4, the water outlet channel 3, and the floating groove 39. The liquid passes through the liquid passing channel 24 and enters the damping chamber 23. After the valve flap 7 rotates, the L-shaped locking rod 13 will push the locking piece 17 to rotate counterclockwise against the elastic force of the torsion spring 18. Then, after the L-shaped locking rod 13 disengages from the locking piece 17, the locking piece 17 reverses under the elastic force of the torsion spring 18 and abuts against the limit piece 16 again. When the liquid gradually stops flowing into the water inlet channel 2, the impact force of the liquid on the valve flap 7 gradually decreases. The valve flap 7 gradually reverses and resets under its own gravity. The L-shaped locking rod 13 and the locking piece 17 are buckled. The driven strip 15 will pull the mass plate 20 to move upward through the transmission line 19. When the mass plate 20 moves upward, it will come into contact with all the buffer soft sheets 22. When the mass plate 20 moves upward, it will be subject to the liquid resistance in the damping chamber 23. Under the combined action of the gravity of the mass plate 20, the liquid resistance in the damping chamber 23, and the resistance of the buffer soft sheets 22, the valve flap 7 will slowly reverse and reset, effectively slowing down the change of the liquid velocity, thereby significantly reducing the impact of the water hammer effect on the valve flap 7 and other components, and effectively extending the service life of the water stop valve.

[0045] After the left end of the wedge bar 10 abuts against the inner wall of the valve chamber 4, the valve flap 7 resets. The inner wall of the valve chamber 4 pushes the wedge bar 10 to move rightward, thereby pushing the wedge block 12 to move downward. The L-shaped locking rod 13 moves downward against the elastic force of the second spring 14. The L-shaped locking rod 13 releases the interlocking with the locking piece 17. Under the action of gravity, the mass plate 20 moves downward until it abuts against the bottom wall of the damping chamber 23. The driven bar 15 abuts against the inner wall of the valve chamber 4 again. After the heater 31 stops generating heat, the thermal expansion member 28 cools and contracts, and the second permanent magnet 27 moves downward to reset. The second permanent magnet 27 magnetically adsorbs the first permanent magnet 26, thereby increasing the degree of abutment between the valve flap 7, the sealing ring 25 and the inner wall of the valve chamber 4, effectively blocking the water inlet passage 2 and preventing dripping.

[0046] When there is liquid in the floating groove 39, the first floating block 44 floats. During the floating process of the first floating block 44, the liquid transmission channel 45 will be briefly connected to the liquid passing channel 41, and a small amount of liquid will pass through the liquid transmission channel 45 and the liquid passing channel 41 and enter the floating chamber 40. When the liquid in the floating groove 39 drains away, the first floating block 44 moves downward under its own gravity and resets until it abuts against the limit block 43. During the downward movement of the first floating block 44, the liquid transmission channel 45 will be briefly connected to the liquid passing channel 41 again. After the first floating block 44 moves up and down many times, the liquid level in the floating chamber 40 rises, and the second floating block 46 floats, thereby driving the connecting bar 47 and the conduction block 48 to gradually move upward. The guide agent channel 49 will be sequentially connected to each branch channel 52, so that the lubricant 53 passes through the guide agent channel 49, the branch channel 52 and the main channel 51 and drips onto the rotating shaft 6 to lubricate the rotating shaft 6 and make the rotation of the rotating shaft 6 smoother.

[0047] After the liquid pushes the valve flap 7 to rotate, the present invention can automatically make the L-shaped locking rod 13 interlock with the locking piece 17 and the driven bar 15. The gravity of the mass plate 20, the liquid resistance in the damping chamber 23 and the resistance of the buffer soft sheet 22 jointly act on the valve flap 7 to generate damping, so that the reset process of the valve flap 7 proceeds slowly, preventing the water hammer phenomenon caused by the too fast reset of the valve flap 7 from damaging the check valve and improving the service life of the check valve. And the liquid drives the pressing piece 37 to automatically start the heater 31, so that the second permanent magnet 27 can automatically move up and down, making the valve flap 7 easier to rotate and increasing the sealing effect, preventing liquid dripping, and preventing the rotating shaft 6 from freezing and being difficult to rotate in a super-low temperature environment by the heat generated by the heater 31. The liquid drives the first floating block 44 to move, so that after the check valve is used many times, the operation of automatically adding the lubricant 53 to the rotating shaft 6 can be realized, without manual addition, which is convenient and fast.

[0048] The components, modules, mechanisms and devices whose structures are not described in detail in the present invention are all common standard parts or parts known to those skilled in the art. Their structures and principles can all be known by those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A large-diameter cryogenic check valve, characterized in that it comprises Valve body (1), a valve cavity (4) and a damping cavity (23) are provided inside the valve body (1). The valve cavity (4) communicates with the outer wall of the valve body (1) through a water inlet channel (2), and the valve cavity (4) communicates with the outer wall of the valve body (1) through a water outlet channel (3). The inner wall of the damping cavity (23) communicates with the inner wall of the water outlet channel (3) through a liquid passing channel (24). A valve state recording component is provided inside the valve body (1), and the valve state recording component includes a temperature detection unit, a flow rate detection unit and a wireless module. The temperature detection unit and the flow rate detection unit are electrically connected to the wireless module respectively; A rotating shaft (6) is rotatably connected to the inner wall of the valve cavity (4). A rotating handle (5) is fixedly connected to the rotating shaft (6). A valve flap (7) is fixedly connected to the rotating handle (5). A transmission groove (8) is provided on the valve flap (7). The transmission groove (8) communicates with the outer wall of the valve flap (7) through a strip channel (9). A wedge strip (10) is slidably connected to the inner wall of the strip channel (9). The wedge strip (10) extends into the transmission groove (8). The wedge strip (10) is connected to the inner wall of the transmission groove (8) through a first spring (11). An L-shaped locking rod (13) is slidably connected to the inner wall of the transmission groove (8). A wedge block (12) is fixedly connected to the L-shaped locking rod (13). The wedge block (12) abuts against the wedge strip (10). The L-shaped locking rod (13) is connected to the inner wall of the transmission groove (8) through a second spring (14). The L-shaped locking rod (13) extends out of the transmission groove (8). A mass plate (20) is slidably connected to the inner wall of the damping cavity (23). A transmission wire (19) is fixedly connected to the mass plate (20). A reversing wheel (21) is rotatably connected to the inner wall of the damping cavity (23). One end of the transmission wire (19) extends into the valve cavity (4) after being guided by the reversing wheel (21). One end of the transmission wire (19) located in the valve cavity (4) is fixedly connected to a driven strip (15). A limiting piece (16) is fixedly connected to the driven strip (15). A locking piece (17) is rotatably connected to the driven strip (15). The locking piece (17) abuts against the limiting piece (16). The locking piece (17) is connected to the driven strip (15) through a torsion spring (18).

2. The large-diameter cryogenic check valve according to claim 1, characterized in that, A first permanent magnet (26) is embedded on the valve flap (7). A magnet cavity (29) and a device cavity (33) are provided inside the valve body (1). A second permanent magnet (27) is slidably connected to the inner wall of the magnet cavity (29). A thermal expansion part (28) is fixedly connected to the inner wall of the magnet cavity (29). The thermal expansion part (28) is fixedly connected to the second permanent magnet (27). A heater (31) is fixedly connected to the inner wall of the device cavity (33). A heat conducting strip (30) is fixedly connected to the heater (31). The heat conducting strip (30) is in a C shape. One end of the heat conducting strip (30) extends into the magnet cavity (29) and abuts against the thermal expansion part (28). The other end of the heat conducting strip (30) extends into the valve cavity (4). The heat conducting strip (30) abuts against the rotating shaft (6).

3. The large-diameter cryogenic check valve according to claim 2, characterized in that, A button (32) is movably connected to the heater (31). A first airbag (34) is fixedly connected to the inner wall of the device cavity (33). The first airbag (34) abuts against the button (32). A second airbag (36) is fixedly connected to the inner wall of the water inlet channel (2). The second airbag (36) is connected to the first airbag (34) through an air pipe (35). A pressing piece (37) is rotatably connected to the inner wall of the water inlet channel (2). The pressing piece (37) is fixedly connected to the second airbag (36).

4. The large-diameter cryogenic check valve according to claim 3, characterized in that, A lubricant adding tank (54) is fixedly connected inside the valve body (1).

5. The large-diameter cryogenic check valve according to claim 4, wherein, The lubricant adding tank (54) is provided with a floating groove (39), a floating cavity (40) and a storage cavity (42). A limiting block (43) is fixedly connected to the inner wall of the floating groove (39). A first floating block (44) is slidably connected to the inner wall of the floating groove (39). The first floating block (44) abuts against the limiting block (43). A liquid transmission channel (45) is provided on the first floating block (44). The floating groove (39) communicates with the floating cavity (40) through a liquid passing channel (41). A second floating block (46) is slidably connected to the inner wall of the floating cavity (40). A connecting strip (47) is fixedly connected to the second floating block (46). The upper end of the connecting strip (47) extends to the inner wall of the storage cavity (42). A conduction block (48) is slidably connected to the inner wall of the storage cavity (42). The conduction block (48) is fixedly connected to the connecting strip (47) and the limiting block (43). A guiding agent channel (49) is provided on the conduction block (48). An agent outlet pipe (50) is fixedly connected to the inner wall of the storage cavity (42). A main channel (51) is provided on the agent outlet pipe (50). The main channel (51) communicates with the bottom wall of the agent outlet pipe (50). The main channel (51) communicates with the outer wall of the agent outlet pipe (50) through two or more branch channels (52). The lower end of the agent outlet pipe (50) extends into the valve cavity (4). The lower end of the agent outlet pipe (50) abuts against the rotating shaft (6). The storage cavity (42) is filled with a lubricant (53).

6. The large-diameter cryogenic check valve according to claim 5, characterized in that, A sealing ring (25) is inlaid on the valve flap (7).

7. The large-diameter cryogenic check valve according to claim 6, characterized in that, A heat conduction groove (38) is provided on the heat conduction strip (30). The inner wall of the heat conduction groove (38) abuts against the rotating shaft (6).

8. The large-diameter cryogenic check valve according to claim 7, characterized in that, The floating cavity (40) is connected to the inner wall of the valve cavity (4) through an electric valve (55).

9. A large-diameter cryogenic check valve according to any one of claims 1-8, characterized in that, Two or more buffer soft sheets (22) are fixedly connected to the inner wall of the damping cavity (23).

10. A large-diameter cryogenic check valve according to claim 9, characterized in that, The temperature detection unit includes a temperature sensor, and the flow rate detection unit includes a liquid flowmeter.

Images