Ultralow-temperature stop valve with non-return function

Abstract

The invention belongs to the field of stop valves, particularly relates to an ultralow-temperature stop valve with a non-return function, and provides the following scheme aiming at the problems that when an existing valve is closed, the non-return effect cannot be achieved, during liquid return of the valve, monitoring cannot be carried out, the type and flow of backflow liquid cannot be rapidly known, and the overhauling difficulty of a device is improved. The valve comprises a valve body, a cover plate is fixedly connected to the top of the valve body through bolts, a water inlet and a water outlet are formed in the two ends of the valve body respectively, a connecting hole is formed in the valve body and used for connecting the water inlet and the water outlet, and a control assembly used for controlling opening and closing of the valve is arranged at the top of the cover plate. After the valve is closed, the electromagnet is closed, a plurality of arc-shaped blocks are inserted among a plurality of strip-shaped plates, liquid backflow is avoided, when the weight is gradually increased, the buzzer alarm starts to give an alarm to remind a worker that the backflow liquid flows into the sampling barrel through the L-shaped hole, and the sampling process is completed.

Description

Technical Field

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

[0002] The stop valve, also known as the intercept valve, is the most widely used valve. The reason why it is so popular is that the friction between the sealing surfaces during opening and closing is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is not only suitable for medium and low pressures, but also for high pressures. The closing principle of the stop valve is to rely on the valve stem pressure to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the flow of the medium.

[0003] After searching, the utility model with announcement number CN221145322U provides a flange stop valve, but the stop valve still has the following defects when in use:

[0004] 1. When the valve is closed, the check effect cannot be achieved, and when the valve returns liquid, it cannot be monitored, which may lead to the risk of leakage;

[0005] 2. When the valve returns liquid, it is impossible to quickly understand the type and flow rate of the returning liquid, and thus it is impossible to quickly understand the return liquid position, which increases the difficulty of maintenance of the device. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art that when the valve is closed, the check effect cannot be achieved, and when the valve returns liquid, monitoring cannot be performed, which may lead to the risk of leakage. When the valve returns liquid, the type and flow rate of the reflux liquid cannot be quickly understood, and the return liquid position cannot be quickly understood, which increases the difficulty of maintenance of the device. An ultra-low temperature stop valve with a check function is proposed to solve the problems in the prior art that when the valve is closed, the check effect cannot be achieved, and when the valve returns liquid, monitoring cannot be performed, which may lead to the risk of leakage. When the valve returns liquid, the type and flow rate of the reflux liquid cannot be quickly understood, and the return liquid position cannot be quickly understood, which increases the difficulty of maintenance of the device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A cryogenic stop valve with a check function, comprising a valve body, a cover plate fixedly connected to the top of the valve body by bolts, a water inlet and a water outlet respectively provided at both ends of the valve body, a connecting hole provided inside the valve body, the connecting hole being used to connect the water inlet and the water outlet, and a control component for controlling the opening and closing of the valve provided on the top of the cover plate;

[0009] A mounting hole is provided at the bottom of the valve body, a circular cylinder is provided inside the mounting hole, and a monitoring component for monitoring reflux liquid is provided inside the circular cylinder;

[0010] A fixing ring is arranged inside the connecting hole, and a brake assembly for sealing the valve is arranged at the bottom of the fixing ring;

[0011] The bottom of the circular cylinder is rotatably connected to a rotating seat, and a sampling component for sampling the reflux liquid is arranged inside the rotating seat.

[0012] In a possible design, the control component includes a mounting seat fixedly connected to the inside of the cover plate, the top of the cover plate is fixedly connected to a fixing plate by bolts, the internal thread of the fixing plate is penetrated by a threaded rod, the top of the threaded rod is provided with an operating panel, the inside of the threaded rod is integrally formed with a first round rod, the first round rod penetrates the mounting seat, the bottom of the first round rod is provided with a valve flap, the bottom of the valve flap is provided with a plurality of strip plates, and the valve flap is used in conjunction with a fixing ring.

[0013] In one possible design, the monitoring component includes a piston plate slidably connected to the inside of a circular cylinder, a sealing gasket is fixedly connected to the top of the piston plate, a through hole is opened on the top of the circular cylinder, the through hole is used in conjunction with the sealing gasket, a damper is provided on the bottom inner wall of the circular cylinder, one end of the damper is fixedly connected to the bottom of the piston plate, and two symmetrically arranged electromagnets are fixedly connected to the top inner wall of the circular cylinder, and the electromagnets are used in conjunction with the piston plate.

[0014] In a possible design, two symmetrically arranged support rods are fixedly connected to the inner wall of the bottom of the circular cylinder, a convex plate is fixedly connected to one side of one of the support rods, an elastic switch is arranged at the bottom of the piston plate, the elastic switch is used in conjunction with the convex plate, and a buzzer alarm is arranged at the bottom of the circular cylinder, the buzzer alarm is electrically connected to the elastic switch.

[0015] In a possible design, the brake assembly includes a rotating ring rotatably connected to the bottom of a fixed ring, the inner wall of the rotating ring is integrally formed with a plurality of protrusions, the bottom of the fixed ring is provided with a plurality of sliding grooves, a slider is slidingly connected inside the sliding groove, a first spring is fixedly connected between one side of the slider and the inner wall of one side of the sliding groove, an arc block is fixedly connected to the bottom of the slider, the arc block is located inside the rotating ring and is used in conjunction with the protrusions.

[0016] In a possible design, the brake assembly also includes a connecting rod fixedly connected to one side of the bottom of the rotating ring, the bottom of the connecting rod is fixedly connected to an arc plate, one side of the arc plate is provided with an inclined groove, the top of the circular cylinder is fixedly connected to a circular ring frame, the outer wall of the circular ring frame is provided with a plurality of water inlet holes, the inside of the circular ring frame is slidably connected to a circular plate, the bottom of the circular plate is fixedly connected to a push rod, the push rod is used in conjunction with a sealing gasket, and one side of the circular plate is fixedly connected to an insertion rod, the insertion rod is used in conjunction with the inclined groove.

[0017] In a possible design, the sampling assembly includes a plurality of vertical grooves opened on the outer wall of the rotating seat, a placement plate is slidably connected to the interior of the vertical groove, a second round rod is fixedly connected to one side of the placement plate, one end of the second round rod slides through the rotating seat and is fixedly connected to a limiting block, a same tension spring is fixedly connected between one side of the limiting block and one side of the rotating seat, and the tension spring is sleeved on the second round rod.

[0018] In a possible design, a placement groove is provided inside the placement plate, a sampling tube is embedded inside the placement groove, an L-shaped hole is provided inside the circular tube, the L-shaped hole is used in conjunction with the sampling tube, an operating hole is provided on one side of the placement plate, and the operating hole is connected to the placement groove.

[0019] In a possible design, a limiting ring is provided on the rotating sleeve of the outer wall of the rotating seat, a groove is opened on one side of the limiting ring, a same pull plate is slidably connected between the inner walls on both sides of the groove, a handle is fixedly connected to one side of the pull plate, two symmetrically arranged second springs are fixedly connected between the bottom of the pull plate and the bottom inner wall of the groove, and the pull plate and the limiting ring are both located on one side of the multiple placement plates.

[0020] In the present application, when in use, the fluid is input from the water inlet, passes through the connecting hole and the fixing ring, and finally discharged through the water outlet. When the valve needs to be closed, the operating disk can be rotated, and the operating disk drives the threaded rod and the first round rod to rotate. The threaded rod rotates and moves downward inside the fixing plate, and the first round rod drives the valve disc and the strip plate to rotate and move downward. At this time, the valve disc moves to the top of the fixing ring and seals the connecting hole.

[0021] At this time, the electromagnet is turned off. At this time, the electromagnet no longer attracts the piston plate. The piston plate and the sealing gasket move downward under the action of gravity. However, due to the existence of the damper, the piston plate still has a certain height. At this time, the push rod and the circular plate fall under the action of gravity, and the circular plate drives the plug rod to fall. The plug rod moves along the inclined groove, and then drives the arc plate to rotate. The arc plate can drive the connecting rod to rotate, and the connecting rod drives the rotating ring to rotate. The rotating ring drives multiple protrusions to rotate. The protrusions push the multiple arc blocks to approach each other, and the multiple arc blocks drive the slider to move. The slider squeezes the first spring, and the multiple arc blocks are inserted between the multiple strip plates, which can prevent the valve disc from loosening and prevent liquid reflux.

[0022] If there is fluid backflow, the fluid will enter the inside of the circular cylinder. When the weight gradually increases, the piston plate gradually moves down, and the backflowing liquid will enter the inside of the L-shaped hole. When the piston plate moves down to the top of the support rod, the support rod supports the piston plate, and the convex plate contacts the elastic switch, which can trigger the buzzer alarm, and the buzzer alarm starts to alarm to remind the staff;

[0023] When in use, if it is necessary to sample the refluxed liquid, the rotating seat can be rotated, and the top of the rotating seat no longer blocks the bottom of the L-shaped hole, and one of the sampling tubes is moved below the L-shaped hole. At this time, the refluxed liquid flows into the interior of the sampling tube through the L-shaped hole, completing the sampling process;

[0024] And when a suitable sample moves to one side of the groove, the pull plate can be moved vertically downward by the handle first. At this time, the pull plate squeezes the second spring and no longer blocks the placement plate. The placement plate carrying the sampling tube moves laterally under the tension of the tension spring, and the placement plate slides out from the inside of the vertical groove. At this time, the operating hole leaks out, and the placement plate moves to the outside of the circular tube, which can lift the sampling tube upward, thereby making it convenient to take out the sampling tube from the inside of the placement groove.

[0025] Beneficial effects:

[0026] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of braking the valve disc when the valve is closed through the brake assembly, thereby improving the stability of the connection between the valve disc and the fixing ring and preventing fluid backflow;

[0027] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of monitoring liquid reflux through a monitoring component, and can alarm when the weight of the refluxed liquid reaches a certain level, thereby reminding the staff;

[0028] In the present invention, the ultra-low temperature stop valve with a non-return function can achieve the effect of sampling the refluxed liquid through a sampling component, and can perform multiple samplings through the arrangement of multiple sampling tubes, and can also help to remove the sampling tubes by popping out the placement plate.

[0029] In the present invention, after closing the valve, the electromagnet is turned off. At this time, the electromagnet no longer adsorbs the piston plate. A plurality of arc blocks are inserted between a plurality of strip plates to prevent the valve disc from loosening and prevent liquid reflux. When the weight gradually increases, the piston plate gradually moves downward, and the buzzer alarm starts to alarm to remind the staff. The reflux liquid flows into the interior of the sampling tube through the L-shaped hole, completing the sampling process. The sampling tube is removed by popping out the placement plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a three-dimensional structural schematic diagram of a cryogenic stop valve with a check function proposed by the present invention;

[0031] Figure 2 This is a three-dimensional cross-sectional structural schematic diagram of a cryogenic stop valve with a non-return function proposed by the present invention;

[0032] Figure 3This is a schematic diagram of the explosion structure of a cryogenic stop valve with a non-return function proposed by the present invention;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of a fixed ring and a rotating ring in a cryogenic stop valve with a non-return function proposed by the present invention;

[0034] Figure 5 A schematic diagram of the three-dimensional structure of a rotating ring and an arc-shaped block in a cryogenic stop valve with a non-return function proposed by the present invention;

[0035] Figure 6 A schematic diagram of the three-dimensional structure of a circular plate and a water inlet hole in a cryogenic stop valve with a non-return function proposed by the present invention;

[0036] Figure 7 This is a schematic diagram of a three-dimensional cross-sectional structure of a circular cylinder in a cryogenic stop valve with a non-return function proposed by the present invention;

[0037] Figure 8 A three-dimensional structural schematic diagram of a super-low temperature stop valve damper with a non-return function and a buzzer alarm proposed by the present invention;

[0038] Fig. 9 A schematic diagram of the three-dimensional structure of a limit ring and a rotating seat in a cryogenic stop valve with a non-return function proposed by the present invention;

[0039] Fig.10 This is a schematic diagram of the three-dimensional structure of a rotating seat in a cryogenic stop valve with a non-return function proposed by the present invention.

[0040] In the figure: 1, valve body; 2, cover plate; 3, fixing plate; 4, threaded rod; 5, operating panel; 6, first round rod; 7, mounting seat; 8, valve disc; 9, water outlet; 10, fixing ring; 11, round cylinder; 12, arc plate; 13, plug rod; 14, water inlet; 15, connecting hole; 16, mounting hole; 17, strip plate; 18, inclined groove; 19, arc block; 20, slide groove; 21, rotating ring; 22, connecting rod; 23, first spring; 24, slider; 25, protrusion; 26, round plate; 27, push rod ; 28. Ring frame; 29. ​​Water inlet hole; 30. Electromagnet; 31. Sealing gasket; 32. Piston plate; 33. L-shaped hole; 34. Support rod; 35. Limiting ring; 36. Rotating seat; 37. Damper; 38. Convex plate; 39. Buzzer alarm; 40. Elastic switch; 41. Pull plate; 42. Handle; 43. Second spring; 44. Groove; 45. Tension spring; 46. Second round rod; 47. Sampling tube; 48. Operating hole; 49. Placement slot; 50. Vertical slot; 51. Limiting block; 52. Placement plate. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1

[0043] Reference Figure 1-10 A cryogenic stop valve with a check function, which is used in the field of stop valves, comprises: a valve body 1, a cover plate 2 is fixedly connected to the top of the valve body 1 by bolts, a water inlet 14 and a water outlet 9 are respectively provided at both ends of the valve body 1, a connecting hole 15 is provided inside the valve body 1, and the connecting hole 15 is used to connect the water inlet 14 and the water outlet 9, a control component for controlling the opening and closing of the valve is arranged on the top of the cover plate 2, and the control component comprises a mounting seat 7 fixedly connected to the inside of the cover plate 2, a fixing plate 3 is fixedly connected to the top of the cover plate 2 by bolts, a threaded rod 4 is penetrated through the internal thread of the fixing plate 3, an operating panel 5 is arranged on the top of the threaded rod 4, and the inside of the threaded rod 4 is integrally formed There is a first round rod 6, the first round rod 6 passes through the mounting seat 7, a valve flap 8 is arranged at the bottom of the first round rod 6, a plurality of strip plates 17 are arranged at the bottom of the valve flap 8, the valve flap 8 is used in conjunction with a fixing ring 10, the fluid is input from the water inlet 14, passes through the connecting hole 15 and the fixing ring 10, and finally discharged through the water outlet 9, when the valve needs to be closed, the operating disk 5 can be rotated, the operating disk 5 drives the threaded rod 4 and the first round rod 6 to rotate, the threaded rod 4 rotates and moves downward inside the fixing plate 3, the first round rod 6 drives the valve flap 8 and the strip plate 17 to rotate and move downward, at this time the valve flap 8 moves to the top of the fixing ring 10, and the connecting hole 15 is sealed;

[0044] A mounting hole 16 is provided at the bottom of the valve body 1, a circular cylinder 11 is provided inside the mounting hole 16, a monitoring assembly for monitoring reflux liquid is provided inside the circular cylinder 11, the monitoring assembly includes a piston plate 32 slidably connected to the inside of the circular cylinder 11, a sealing gasket 31 is fixedly connected to the top of the piston plate 32, a through hole is provided at the top of the circular cylinder 11, the through hole and the sealing gasket 31 are used in conjunction with each other, a damper 37 is provided on the bottom inner wall of the circular cylinder 11, one end of the damper 37 is fixedly connected to the bottom of the piston plate 32, two symmetrically arranged electromagnets 30 are fixedly connected to the top inner wall of the circular cylinder 11, the electromagnets 30 are used in conjunction with the piston plate 32, and two symmetrically arranged support rods 34 are fixedly connected to the bottom inner wall of the circular cylinder 11, which A convex plate 38 is fixedly connected to one side of a support rod 34, and an elastic switch 40 is provided at the bottom of the piston plate 32. The elastic switch 40 is used in conjunction with the convex plate 38. A buzzer alarm 39 is provided at the bottom of the circular cylinder 11. The buzzer alarm 39 is electrically connected to the elastic switch 40. If there is fluid reflux, the fluid will enter the interior of the circular cylinder 11. When the weight gradually increases, the piston plate 32 gradually moves down, and the refluxed liquid will enter the interior of the L-shaped hole 33. When the piston plate 32 moves down to the top of the support rod 34, the support rod 34 supports the piston plate 32, and the convex plate 38 conflicts with the elastic switch 40. At this time, the buzzer alarm 39 can be triggered, and the buzzer alarm 39 starts to alarm to remind the staff;

[0045] A fixing ring 10 is arranged inside the connecting hole 15, and a brake assembly for sealing the valve is arranged at the bottom of the fixing ring 10, the brake assembly comprises a rotating ring 21 rotatably connected to the bottom of the fixing ring 10, a plurality of protrusions 25 are integrally formed on the inner wall of the rotating ring 21, a plurality of slide grooves 20 are provided at the bottom of the fixing ring 10, a slider 24 is slidably connected inside the slide groove 20, a first spring 23 is fixedly connected between one side of the slider 24 and an inner wall of one side of the slide groove 20, an arc block 19 is fixedly connected to the bottom of the slider 24, the arc block 19 is located inside the rotating ring 21 and is used in conjunction with the protrusion 25, the brake assembly also comprises a connecting rod 22 fixedly connected to one side of the bottom of the rotating ring 21, a curved plate 12 is fixedly connected to the bottom of the connecting rod 22, a chute 18 is provided on one side of the curved plate 12, a circular ring frame 28 is fixedly connected to the top of the circular cylinder 11, a plurality of water inlet holes 29 are provided on the outer wall of the circular ring frame 28, a circular plate 26 is slidably connected inside the circular ring frame 28, and a circular plate 26 is provided on the inner wall of the circular plate 26. The bottom is fixedly connected with a push rod 27, which is used in conjunction with a sealing gasket 31. One side of the circular plate 26 is fixedly connected with an insertion rod 13, which is used in conjunction with the inclined slot 18. At this time, the electromagnet 30 is closed, and the electromagnet 30 no longer adsorbs the piston plate 32. The piston plate 32 and the sealing gasket 31 move downward under the action of gravity. However, due to the existence of the damper 37, the piston plate 32 still has a certain height. At this time, the push rod 27 and the circular plate 26 fall under the action of gravity, and the circular plate 26 drives the insertion rod 13 The plunger 13 moves along the inclined slot 18, and then drives the arc plate 12 to rotate. The arc plate 12 drives the connecting rod 22 to rotate. The connecting rod 22 drives the rotating ring 21 to rotate. The rotating ring 21 drives the plurality of protrusions 25 to rotate. The protrusions 25 push the plurality of arc blocks 19 to approach each other. The plurality of arc blocks 19 drives the slider 24 to move. The slider 24 squeezes the first spring 23. The plurality of arc blocks 19 are inserted between the plurality of strip plates 17, so as to prevent the valve flap 8 from loosening and prevent the liquid from flowing back.

[0046] The bottom of the circular cylinder 11 is rotatably connected to a rotating seat 36, and a sampling assembly for sampling the reflux liquid is arranged inside the rotating seat 36. The sampling assembly includes a plurality of vertical grooves 50 opened on the outer wall of the rotating seat 36, and a placement plate 52 is slidably connected inside the vertical groove 50. A second round rod 46 is fixedly connected to one side of the placement plate 52. One end of the second round rod 46 slides through the rotating seat 36 and is fixedly connected to a limiting block 51. A tension spring 45 is fixedly connected between one side of the limiting block 51 and one side of the rotating seat 36. The tension spring 45 is sleeved on the second round rod 46. The placement plate 52 is opened inside A placement groove 49 is provided, and a sampling tube 47 is embedded in the placement groove 49. An L-shaped hole 33 is provided in the circular tube 11, and the L-shaped hole 33 is used in conjunction with the sampling tube 47. An operation hole 48 is provided on one side of the placement plate 52, and the operation hole 48 is connected to the placement groove 49. When in use, if it is necessary to sample the refluxed liquid, the rotating seat 36 can be rotated. At this time, the top of the rotating seat 36 no longer blocks the bottom of the L-shaped hole 33, and one of the sampling tubes 47 is moved to the bottom of the L-shaped hole 33. At this time, the refluxed liquid flows into the interior of the sampling tube 47 through the L-shaped hole 33 to complete the sampling process.

[0047] Example 2

[0048] refer to Figure 9-10 , improved on the basis of Example 1: a limiting ring 35 is rotatably sleeved on the outer wall of the rotating seat 36, a groove 44 is opened on one side of the limiting ring 35, and a same pull plate 41 is slidably connected between the inner walls of the two sides of the groove 44, and a handle 42 is fixedly connected to one side of the pull plate 41, and two second springs 43 symmetrically arranged are fixedly connected between the bottom of the pull plate 41 and the bottom inner wall of the groove 44, the pull plate 41 and the limiting ring 35 are both located on one side of the multiple placement plates 52, and when a suitable sample moves to one side of the groove 44, the pull plate 41 can be vertically moved downward by the handle 42 first, at this time, the pull plate 41 squeezes the second spring 43 and does not block the placement plate 52, and the placement plate 52 carrying the sampling tube 47 moves laterally under the tension of the tension spring 45, and the placement plate 52 slides out from the inside of the vertical groove 50, at this time the operating hole 48 leaks out, and the placement plate 52 moves to the outside of the circular cylinder 11, and the sampling tube 47 can be pushed upward, so that the sampling tube 47 can be conveniently taken out from the inside of the placement groove 49.

[0049] However, as is well known to those skilled in the art, the working principles and wiring methods of the electromagnet 30, the elastic switch 40 and the buzzer alarm 39 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cryogenic stop valve with a non-return function, characterized in that: include: A valve body (1), the top of the valve body (1) is fixedly connected to a cover plate (2) by bolts, two ends of the valve body (1) are respectively provided with a water inlet (14) and a water outlet (9), a connecting hole (15) is provided inside the valve body (1), the connecting hole (15) is used to connect the water inlet (14) and the water outlet (9), and a control component for controlling the opening and closing of the valve is provided on the top of the cover plate (2); The bottom of the valve body (1) is provided with a mounting hole (16), a circular cylinder (11) is arranged inside the mounting hole (16), and a monitoring component for monitoring reflux liquid is arranged inside the circular cylinder (11); A fixing ring (10) is arranged inside the connecting hole (15), and a brake assembly for sealing the valve is arranged at the bottom of the fixing ring (10); The bottom of the circular cylinder (11) is rotatably connected to a rotating seat (36), and a sampling component for sampling the reflux liquid is arranged inside the rotating seat (36).

2. The ultra-low temperature stop valve with a non-return function according to claim 1, characterized in that: The control assembly comprises a mounting seat (7) fixedly connected to the inside of the cover plate (2); the top of the cover plate (2) is fixedly connected to a fixing plate (3) by bolts; a threaded rod (4) is penetrated through the internal thread of the fixing plate (3); an operating panel (5) is arranged on the top of the threaded rod (4); a first round rod (6) is integrally formed inside the threaded rod (4); the first round rod (6) penetrates the mounting seat (7); a valve flap (8) is arranged at the bottom of the first round rod (6); a plurality of strip plates (17) are arranged at the bottom of the valve flap (8); the valve flap (8) is used in conjunction with a fixing ring (10).

3. The ultra-low temperature stop valve with a non-return function according to claim 1, characterized in that: The monitoring component comprises a piston plate (32) slidably connected to the inside of a circular cylinder (11); a sealing gasket (31) is fixedly connected to the top of the piston plate (32); a through hole is opened at the top of the circular cylinder (11); the through hole is used in conjunction with the sealing gasket (31); a damper (37) is arranged on the inner wall of the bottom of the circular cylinder (11); one end of the damper (37) is fixedly connected to the bottom of the piston plate (32); two symmetrically arranged electromagnets (30) are fixedly connected to the inner wall of the top of the circular cylinder (11); the electromagnets (30) are used in conjunction with the piston plate (32).

4. The ultra-low temperature stop valve with a non-return function according to claim 3, characterized in that: The inner wall at the bottom of the circular cylinder (11) is fixedly connected to two symmetrically arranged support rods (34), one side of one of the support rods (34) is fixedly connected to a convex plate (38), the bottom of the piston plate (32) is provided with an elastic switch (40), the elastic switch (40) is used in conjunction with the convex plate (38), and the bottom of the circular cylinder (11) is provided with a buzzer alarm (39), the buzzer alarm (39) is electrically connected to the elastic switch (40).

5. The ultra-low temperature stop valve with a non-return function according to claim 1, characterized in that: The brake assembly comprises a rotating ring (21) rotatably connected to the bottom of a fixed ring (10), the inner wall of the rotating ring (21) is integrally formed with a plurality of protrusions (25), the bottom of the fixed ring (10) is provided with a plurality of slide grooves (20), the interior of the slide groove (20) is slidably connected with a slider (24), one side of the slider (24) and the inner wall of one side of the slide groove (20) are fixedly connected with a same first spring (23), the bottom of the slider (24) is fixedly connected with an arc block (19), the arc block (19) is located inside the rotating ring (21) and is used in conjunction with the protrusions (25).

6. The ultra-low temperature stop valve with a non-return function according to claim 4, characterized in that: The brake assembly also includes a connecting rod (22) fixedly connected to one side of the bottom of the rotating ring (21); the bottom of the connecting rod (22) is fixedly connected to an arc plate (12); one side of the arc plate (12) is provided with an inclined groove (18); the top of the circular cylinder (11) is fixedly connected to an annular frame (28); the outer wall of the annular frame (28) is provided with a plurality of water inlet holes (29); the inside of the annular frame (28) is slidably connected to a circular plate (26); the bottom of the circular plate (26) is fixedly connected to a push rod (27); the push rod (27) is used in conjunction with a sealing gasket (31); one side of the circular plate (26) is fixedly connected to an insertion rod (13); the insertion rod (13) is used in conjunction with the inclined groove (18).

7. The ultra-low temperature stop valve with a non-return function according to claim 1, characterized in that: The sampling assembly includes a plurality of vertical grooves (50) provided on the outer wall of the rotating seat (36), the interior of the vertical grooves (50) is slidably connected to a placement plate (52), one side of the placement plate (52) is fixedly connected to a second round rod (46), one end of the second round rod (46) slides through the rotating seat (36) and is fixedly connected to a limit block (51), one side of the limit block (51) is fixedly connected to a same tension spring (45) with one side of the rotating seat (36), and the tension spring (45) is sleeved on the second round rod (46).

8. The ultra-low temperature stop valve with a non-return function according to claim 7, characterized in that: The placement plate (52) has a placement groove (49) formed inside, a sampling tube (47) is embedded inside the placement groove (49), an L-shaped hole (33) is formed inside the circular tube (11), the L-shaped hole (33) is used in conjunction with the sampling tube (47), and an operating hole (48) is formed on one side of the placement plate (52), the operating hole (48) is communicated with the placement groove (49).

9. The ultra-low temperature stop valve with a non-return function according to claim 8, characterized in that: The outer wall of the rotating seat (36) is rotatably sleeved with a limiting ring (35), one side of the limiting ring (35) is provided with a groove (44), the inner walls on both sides of the groove (44) are slidably connected with a same pull plate (41), one side of the pull plate (41) is fixedly connected with a handle (42), two symmetrically arranged second springs (43) are fixedly connected between the bottom of the pull plate (41) and the bottom inner wall of the groove (44), and the pull plate (41) and the limiting ring (35) are both located on one side of the plurality of placement plates (52).

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