Large-diameter ultralow-temperature check valve

Abstract

The invention relates to the field of check valves, and provides a large-diameter ultralow-temperature check valve which comprises 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 a water inlet channel and communicates with the outer wall of the valve body through a water outlet channel, and the inner wall of the damping cavity communicates with the inner wall of the water outlet channel through a liquid passing channel. A valve state recording assembly is arranged in the valve body and comprises a temperature detection unit, a flow detection unit and a wireless module, the temperature detection unit and the flow detection unit are electrically connected with the wireless module, a rotating shaft is rotationally connected to the inner wall of the valve cavity, a rotating handle is fixedly connected to the rotating shaft, a valve clack is fixedly connected to the rotating handle, and a transmission groove is formed in the valve clack. The transmission groove communicates with the outer wall of the valve clack through a strip channel, and a wedge-shaped strip is slidably connected to the inner wall of the strip channel and extends into the transmission groove. Damping can be generated on the valve clack, the resetting process of the valve clack is slow, and the situation that the check valve is damaged due to the water hammer phenomenon caused by too fast resetting of the valve clack is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, and in particular to a large-caliber ultra-low temperature check valve. Background Art

[0002] 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 standards, check valves can be divided into the following categories: lift check valve, swing check valve, butterfly check valve, diaphragm check valve, ball check valve.

[0003] After the medium stops entering the swing check valve, if the valve disc closes too quickly, water hammer will occur, thereby damaging the check valve. Summary of the invention

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

[0005] A large-caliber ultra-low temperature check valve comprises a valve body, a valve cavity and a damping cavity are formed in the valve body, the valve cavity is connected with the outer wall of the valve body through a water inlet channel, the valve cavity is connected with the outer wall of the valve body through a water outlet channel, the inner wall of the damping cavity is connected with the inner wall of the water outlet channel through a liquid passage channel, a valve state recording component is provided in the valve body, the valve state recording component comprises a temperature detection unit, a flow detection unit and a wireless module, and the temperature detection unit and the flow detection unit are electrically connected to the wireless module respectively;

[0006] The inner wall of the valve cavity is rotatably connected with a rotating shaft, a rotating handle is fixedly connected to the rotating shaft, a valve disc is fixedly connected to the rotating handle, a transmission groove is opened on the valve disc, the transmission groove is communicated with the outer wall of the valve disc through a bar channel, a wedge strip is slidably connected to the inner wall of the bar channel, the wedge strip extends into the transmission groove, the wedge 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 block is fixedly connected to the L-shaped locking rod, the wedge block and the wedge strip resist each other, 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, a driven bar is fixedly connected to one end of the transmission line located in the valve cavity, a limiting plate is fixedly connected to the driven bar, a locking plate is rotatably connected to the driven bar, the locking plate and the limiting plate resist each other, and the locking plate is connected to the driven bar 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 flowmeter.

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

[0017] The present invention can automatically interlock the L-shaped locking rod, the locking plate and the driven bar after the liquid pushes the valve disc to rotate, and generate damping on the valve disc through the combined effects of the gravity of the mass plate, the liquid resistance in the damping chamber and the resistance of the buffer soft film, so that the resetting process of the valve disc is carried out slowly, thereby preventing the valve disc from resetting too quickly and causing water hammer phenomenon to damage the check valve, thereby increasing the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of a large-caliber ultra-low temperature check valve of the present invention;

[0020] Figure 2 This is a front view of a large-caliber ultra-low temperature check valve of the present invention;

[0021] Figure 3 The present invention Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 The present invention Figure 2 The enlarged view of point B in the middle;

[0023] Figure 5 The present invention Figure 2 Enlarged view of point C in the middle;

[0024] Figure 6 The present invention Figure 2 The enlarged view of point D in the middle;

[0025] Figure 7 The present invention Figure 1 Schematic diagram of the structure of the middle wedge block and the L-shaped locking rod.

[0026] Figure numerals: 1, valve body; 2, water inlet channel; 3, water outlet channel; 4, valve chamber; 5, turning handle; 6, rotating shaft; 7, valve flap; 8, transmission groove; 9, bar channel; 10, wedge bar; 11, first spring; 12, wedge block; 13, L-shaped locking rod; 14, second spring; 15, driven bar; 16, limit plate; 17, locking plate; 18, torsion spring; 19, transmission line; 20, mass plate; 21, reversing wheel; 22, buffer soft film; 23, damping chamber; 24, liquid passage; 25, sealing ring; 26, first permanent magnet; 27, second permanent magnet; 28, thermal expansion member; 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 sheet; 38. Heat-conducting groove; 39. Floating groove; 40. Floating cavity; 41. Liquid-penetrating channel; 42. Agent storage cavity; 43. Limiting block; 44. First floating block; 45. Liquid-transfer channel; 46. Second floating block; 47. Connecting strip; 48. Conducting block; 49. Agent-conducting channel; 50. Agent outlet pipe; 51. Main channel; 52. Branch channel; 53. Lubricant; 54. Lubricant adding box; 55. Electric valve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 limiting 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 is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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, it can be an electrical connection, it can be a direct connection, it can be connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1-7 As shown, a large-caliber ultra-low temperature check valve comprises a valve body 1, a valve cavity 4 and a damping cavity 23 are provided in the valve body 1, the valve cavity 4 is connected to the outer wall of the valve body 1 through the water inlet channel 2, the valve cavity 4 is connected to the outer wall of the valve body 1 through the water outlet channel 3, the inner wall of the damping cavity 23 is connected to the inner wall of the water outlet channel 3 through the liquid passage 24, and a valve state recording component is provided in the valve body 1, the valve state recording component comprises 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 of the check valve to realize 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 mm, that is, the nominal diameter standard of the large-caliber check valve.

[0031] The inner wall of the valve chamber 4 is rotatably connected with a rotating shaft 6, a rotating handle 5 is fixedly connected to the rotating shaft 6, a valve disc 7 is fixedly connected to the rotating handle 5, a transmission groove 8 is opened on the valve disc 7, the transmission groove 8 is communicated with the outer wall of the valve disc 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 and the wedge strip 10 are against each other, and 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 lock rod 13 extends to the outside of the transmission groove 8, the inner wall of the damping chamber 23 is slidably connected with a mass plate 20, the mass plate 20 is fixed with a transmission line 19, the transmission line 19 can be made of plastic, the inner wall of the damping chamber 23 is rotatably connected with a reversing wheel 21, one end of the transmission line 19 is guided by the reversing wheel 21 and extends into the valve chamber 4, the end of the transmission line 19 located in the valve chamber 4 is fixed with a driven bar 15, the driven bar 15 is fixed with a limit plate 16, the driven bar 15 is rotatably connected with a lock plate 17, the lock plate 17 and the limit plate 16 are against each other, and the lock plate 17 is connected to the driven bar 15 through a torsion spring 18. The valve flap 7 is used to realize the blocking function of the water inlet channel 2.

[0032] like Figure 5-6As shown, in an alternative embodiment according to the present invention, a first permanent magnet 26 is embedded on 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 conducting strip 30 is fixedly connected to the heater 31. The heat conducting strip 30 is in a U shape. One end of the heat conducting strip 30 extends into the magnet cavity 29 and abuts against the thermal expansion member 28. The other end of the heat conducting strip 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 conducting strip 30 can be made of metallic copper. After the heater 31 is started, it can generate heat.

[0033] As Figure 5 shown, in an alternative embodiment according to 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 shown, in an alternative embodiment according to 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, according to an optional embodiment of the present invention, the lubricant adding box 54 is provided with a floating groove 39, a floating cavity 40 and a liquid storage cavity 42, the inner wall of the floating groove 39 is fixedly connected to a limit block 43, the inner wall of the floating groove 39 is slidably connected to a first floating block 44, the first floating block 44 and the limit block 43 are against each other, the first floating block 44 is provided with a liquid transmission channel 45, the floating groove 39 is connected to the floating cavity 40 through a liquid penetration channel 41, the inner wall of the floating cavity 40 is slidably connected to a second floating block 46, the second floating block 46 is fixedly connected to a connecting strip 47, the upper end of the connecting strip 47 extends The inner wall of the agent storage chamber 42 is extended to the inner wall of the agent storage chamber 42, and a conduction block 48 is slidably connected to the inner wall of the agent storage chamber 42. The conduction block 48 is fixed to the limit block 43 of the connecting strip 47, and a conduction channel 49 is provided on the conduction block 48. A discharge pipe 50 is fixed to the inner wall of the agent storage chamber 42, and a main channel 51 is provided on the discharge pipe 50. The main channel 51 is connected to the bottom wall of the discharge pipe 50, and the main channel 51 is connected to the outer wall of the discharge pipe 50 through two or more branch channels 52. The lower end of the discharge pipe 50 extends into the valve chamber 4, and the lower end of the discharge pipe 50 abuts against the rotating shaft 6. The agent storage chamber 42 is filled with a lubricant 53. The lubricant 53 can be a low-temperature resistant lubricant, and both the first floating block 44 and the second floating block 46 can be hollow structures to make it easy to float on the liquid.

[0036] like Figure 5 As shown, according to an optional embodiment of the present invention, a sealing ring 25 is embedded on the valve flap 7. The sealing ring 25 can improve the sealing performance of the valve flap 7 and further prevent leakage.

[0037] like Figure 6 As shown, according to an optional embodiment of the present invention, a heat conducting groove 38 is provided on the heat conducting bar 30, and the inner wall of the heat conducting groove 38 abuts against the rotating shaft 6. The shape of the heat conducting groove 38 is adapted to the rotating shaft 6, so that the rotating shaft 6 will not be blocked during the rotation process and can receive heat normally.

[0038] like Figure 6 As shown, according to an optional 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] like Figure 2 As shown, according to an optional embodiment of the present invention, two or more buffer films 22 are fixedly connected to the inner wall of the damping chamber 23. The buffer films 22 can increase the resistance of the valve flap 7 when it is reset.

[0040] According to an optional implementation of the present invention, the temperature detection unit includes a temperature sensor, which may be a thermocouple temperature sensor or a thermistor temperature sensor; the flow detection unit includes a liquid flow meter, which may be an electromagnetic flow meter.

[0041] Implementation process: The valve body 1 is connected and installed with the pipeline. In the initial state, the first permanent magnet 26 and the second permanent magnet 27 are magnetically connected, the valve flap 7 and the inner wall of the valve cavity 4 are against each other, thereby blocking the water inlet channel 2, the mass plate 20 and the bottom wall of the damping cavity 23 are against each other, and the driven bar 15 and the inner wall of the valve cavity 4 are against each other.

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

[0043] The liquid pushes the pressing plate 37 to rotate counterclockwise, so that the pressing plate 37 flattens the second airbag 36, and 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 button 32 is pressed when the first airbag 34 expands, so that the heater 31 stops heating after a period of time, and the heat conductive strip 30 heats up and the heat expansion member 28 expands. The heat expansion member 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, so that the valve flap 7 is easier to rotate, and the heat conductive strip 30 transfers heat to the rotating shaft 6 to prevent the rotating shaft 6 from freezing and being difficult to rotate in an ultra-low temperature environment.

[0044] The liquid pushes the valve disc 7, causing the valve disc 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 to the outside of the valve disc 7 under the elastic force of the first spring 11, and the wedge 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, and the liquid passes through the liquid passage 24 and enters the damping chamber 23. After the valve disc 7 rotates, the L-shaped locking rod 13 will push the locking plate 17 to overcome the elastic force of the torsion spring 18 and rotate counterclockwise. Then, after the L-shaped locking rod 13 is separated from the locking plate 17, the locking plate 17 is reversed under the elastic force of the torsion spring 18 to counteract the limit plate 16 again. When the liquid stops step by step, After the water stops flowing into the water inlet channel 2, the impact force of the liquid on the valve flap 7 gradually decreases, and the valve flap 7 gradually reverses and resets under the action of its own gravity. The L-shaped locking rod 13 and the locking plate 17 are interlocked, and the driven bar 15 will pull the mass plate 20 upward through the transmission line 19. When the mass plate 20 moves upward, it will come into contact with all the buffer soft films 22. When the mass plate 20 moves upward, it will be affected by 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 films 22, the valve flap 7 will slowly reverse and reset, effectively slowing down the change of liquid speed, thereby significantly reducing the impact of the water hammer effect on the valve flap 7 and other components, and effectively extending the life of the water stop valve.

[0045] When the left end of the wedge strip 10 abuts against the inner wall of the valve cavity 4, the valve flap 7 is reset, and the inner wall of the valve cavity 4 pushes the wedge strip 10 to move right, thereby pushing the wedge block 12 downward, and the L-shaped locking rod 13 overcomes the elastic force of the second spring 14 and moves downward, and the L-shaped locking rod 13 releases the interlocking with the locking plate 17, and the mass plate 20 moves downward under the action of gravity until it abuts against the bottom wall of the damping cavity 23, and the driven strip 15 abuts against the inner wall of the valve cavity 4 again. After the heater 31 stops generating heat, the thermal expansion member 28 cools and shrinks, and the second permanent magnet 27 moves downward and resets, and 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 cavity 4, effectively blocking the water inlet channel 2 to prevent dripping.

[0046] When there is liquid in the floating groove 39, the first floating block 44 floats up. During the floating process of the first floating block 44, the liquid transmission channel 45 will be briefly connected with the liquid penetration channel 41, and a small amount of liquid will pass through the liquid transmission channel 45 and the liquid penetration channel 41 into the floating cavity 40. When the liquid in the floating groove 39 is drained, the first floating block 44 moves downward under the action of its own gravity and resets to be against the limit block 43. During the downward movement of the first floating block 44, the liquid transmission channel 45 will be briefly connected with the liquid penetration channel 41 again. After the first floating block 44 moves up and down many times, the liquid level in the floating cavity 40 rises, and the second floating block 46 floats up, thereby driving the connecting strip 47 and the conduction block 48 to gradually move up, and the guide channel 49 will be connected with each branch channel 52 in turn, so that the lubricant 53 passes through the guide channel 49, the branch channel 52, and the main channel 51 and drips onto the rotating shaft 6, lubricating the rotating shaft 6, so that the rotating shaft 6 rotates more smoothly.

[0047] The present invention can automatically interlock the L-shaped lock rod 13, the lock plate 17 and the driven bar 15 after the liquid pushes the valve flap 7 to rotate, and damp the valve flap 7 through 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 film 22, so that the resetting process of the valve flap 7 is slowly carried out, and the valve flap 7 is prevented from being reset too quickly to cause water hammer phenomenon to damage the check valve, thereby improving the service life of the check valve; and the heater 31 is automatically started by the liquid driving the pressing plate 37, so that the second permanent magnet 27 can automatically move up and down, so that the valve flap 7 is easier to rotate and the sealing effect is increased, and liquid dripping is prevented, and the heat generated by the heater 31 prevents the rotating shaft 6 from freezing and being difficult to rotate in an ultra-low temperature environment; the first floating block 44 is driven by the liquid to move, so that after the check valve is used many times, the operation of automatically adding lubricant 53 to the rotating shaft 6 is realized, without manual addition, which is convenient and quick.

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

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

Claims

1. A large-caliber ultra-low temperature check valve, characterized in that it includes Valve body (1), a valve cavity (4) and a damping cavity (23) are provided 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), and 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 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) 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 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. A large-caliber ultra-low temperature 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 member (28) is fixedly connected to the inner wall of the magnet cavity (29). The thermal expansion member (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 member (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. A large-caliber ultra-low temperature check valve according to claim 2, characterized in that: The heater (31) is movably connected to a button (32); the inner wall of the device cavity (33) is fixedly connected to a first airbag (34); the first airbag (34) and the button (32) are in contact with each other; the inner wall of the water inlet channel (2) is fixedly connected to a second airbag (36); the second airbag (36) is connected to the first airbag (34) via an air pipe (35); the inner wall of the water inlet channel (2) is rotatably connected to a pressing plate (37); the pressing plate (37) and the second airbag (36) are fixedly connected.

4. A large-caliber ultra-low temperature check valve according to claim 3, characterized in that: A lubricant adding box (54) is fixedly connected inside the valve body (1).

5. A large-caliber ultra-low temperature check valve according to claim 4, characterized in that: The lubricant adding box (54) is provided with a floating groove (39), a floating cavity (40) and a liquid storage cavity (42). The inner wall of the floating groove (39) is fixedly connected to a limit block (43). The inner wall of the floating groove (39) is slidably connected to a first floating block (44). The first floating block (44) and the limit block (43) are in contact with each other. The first floating block (44) is provided with a liquid transmission channel (45). The floating groove (39) is connected to the floating cavity (40) through a liquid transmission channel (41). The inner wall of the floating cavity (40) is slidably connected to a second floating block (46). The second floating block (46) is fixedly connected to a connecting strip (47). The upper end of the connecting strip (47) extends to the inner wall of the liquid storage cavity (42). A conduction block (48) is slidably connected to the inner wall of the agent cavity (42), the conduction block (48) and the connection strip (47) and the limit block (43) are fixedly connected, a conduction channel (49) is provided on the conduction block (48), a discharge tube (50) is fixedly connected to the inner wall of the agent storage cavity (42), a main channel (51) is provided on the discharge tube (50), the main channel (51) is connected to the bottom wall of the discharge tube (50), the main channel (51) is connected to the outer wall of the discharge tube (50) through two or more branch channels (52), the lower end of the discharge tube (50) extends into the valve cavity (4), the lower end of the discharge tube (50) is against the rotating shaft (6), and the agent storage cavity (42) is filled with a lubricant (53).

6. A large-caliber ultra-low temperature check valve according to claim 5, characterized in that: A sealing ring (25) is inlaid on the valve flap (7).

7. A large-caliber ultra-low temperature check valve according to claim 6, characterized in that: The heat conducting strip (30) is provided with a heat conducting groove (38), and the inner wall of the heat conducting groove (38) abuts against the rotating shaft (6).

8. A large-caliber ultra-low temperature check valve according to claim 7, characterized in that: The floating chamber (40) is connected to the inner wall of the valve chamber (4) via an electric valve (55).

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

10. A large-caliber ultra-low temperature check valve according to claim 9, characterized in that: The temperature detection unit includes a temperature sensor, and the flow detection unit includes a liquid flow meter.

Images