A low-temperature and low-pressure valve sealing device

Abstract

The present invention provides a low-temperature, low-pressure valve sealing device, comprising a low-temperature valve, wherein the liquid inlet and liquid outlet ends of the low-temperature valve are both connected to a liquid outlet pipe via flanges, the low-temperature valve is externally sheathed with a sealing housing, the interior of the sealing housing is provided with a sealing assembly, and both ends of the sealing housing are interspersed with telescopic assemblies; the sealing housing comprises a first sealing housing sheathed on one end of the low-temperature valve, and a second sealing housing sheathed on the other end of the low-temperature valve, the first and second sealing housings being fixedly connected, and a first sealing packing being fixed to the surfaces of the first and second sealing housings on the sides adjacent to each other. The present invention can seal the low-temperature valve, and steam traps generated by leakage can be discharged to a ditch through a designated discharge port, thereby allowing the unit to operate normally until the maintenance period without endangering personal safety.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of valves, and in particular to a low-temperature and low-pressure valve sealing device. Background Art

[0002] Cryogenic valves refer to valves whose medium temperature is between -40℃ and -196℃. They are mainly used in pipelines of various systems in power plants to cut off or connect pipeline media.

[0003] According to the patent document with application number CN201721021965.4, a low-temperature valve is provided. The valve includes a valve body, a valve cover, a valve seat, a ball, a valve stem, and a handwheel. The valve stem is connected to the ball. There is a gap between the valve stem and the valve cover, forming a neck cavity. The handwheel is arranged at the top of the valve stem. The valve also includes a packing seat, a sealing packing assembly, and a compression sleeve. The packing seat is arranged at the top of the valve cover and is sleeved on the outside of the valve stem. The sealing packing assembly and the compression sleeve are arranged in the packing seat. The compression sleeve is located above the sealing packing assembly and is connected to the sealing packing assembly. A clamping device is provided above the compression sleeve. A pressure relief hole is provided on the lower part of the valve cover, connecting the neck cavity and the valve middle cavity. The low-temperature valve provided by this valve does not experience overpressure in the cavity of the extended valve cover, and can ensure that the seal will not loosen and leak when it shrinks at low temperatures, making it safe and reliable to use.

[0004] While these sealing devices prevent overpressure and are safe and reliable, they often leak. Because the system cannot be isolated, the valves must be shut down to address the problem. If left untreated, the leaking steam poses a safety hazard. For leaks in low-temperature, low-pressure primary valves, shutting down the system to address the problem is costly. Summary of the Invention

[0005] The present invention mainly provides a low-temperature and low-pressure valve sealing device to solve the technical problems raised in the above background technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A low-temperature, low-pressure valve sealing device comprises a low-temperature valve, wherein the liquid inlet and liquid outlet of the low-temperature valve are both connected to a liquid outlet pipe via flanges, the low-temperature valve is externally sheathed with a sealing housing, the interior of the sealing housing is provided with a sealing assembly, and telescopic assemblies are inserted into both ends of the sealing housing;

[0008] The sealing cover comprises a first sealing shell sleeved on one end of the cryogenic valve, and a second sealing shell sleeved on the other end of the cryogenic valve, the first sealing shell and the second sealing shell being fixedly connected, and a first sealing packing being fixed on the surfaces of the first sealing shell and the second sealing shell on the side close to each other;

[0009] The sealing assembly includes a first sealing mechanism arranged inside the sealing cover and sleeved on the outside of the low-temperature valve, and a second sealing mechanism arranged at the bottom end of the first sealing mechanism and connected to the execution end of the telescopic assembly. The first sealing mechanism includes a sliding sealing ring sleeved on the outside of the flange and connected to the execution end of the telescopic assembly, and a second sealing packing arranged on the inner ring surface of the sliding sealing ring.

[0010] Furthermore, the telescopic assembly includes a telescopic motor fixed to one end of the first sealing shell and the second sealing shell away from each other, a first telescopic mechanism connected to the driving end of the first sealing mechanism, and a second telescopic mechanism connected to the driving end of the second sealing mechanism, and the second telescopic mechanism drives the second sealing mechanism to block the gap at the bottom of the first sealing shell and the second sealing shell.

[0011] Furthermore, the first telescopic mechanism includes a first articulated seat fixed to the two side surfaces of one end of the telescopic motor extending to the inside of the sealing cover, a first connecting rod rotatably connected to the first articulated seat via a rotating shaft at one end of the telescopic rod away from the telescopic motor, and a second articulated seat rotatably connected to the first connecting rod via a rotating shaft at one end of the telescopic rod away from the telescopic motor, the second articulated seat being fixed to the outer surface of the sliding sealing ring, the first connecting rod pushing the sliding sealing ring so that the sliding sealing ring slides on the outer surface of the flange, so as to seal the gap between the two adjacent flanges through the sliding sealing ring.

[0012] Furthermore, the second telescopic mechanism includes a telescopic rod fixed to the telescopic motor and extending to a third articulated seat on the lower surface of one end inside the sealing cover shell, a second connecting rod rotatably connected to the third articulated seat through a rotating shaft, and a fourth articulated seat rotatably connected to one end of the second connecting rod away from the third articulated seat, and a toothed sealer is fixed to the lower surface of the fourth articulated seat, and the two toothed sealers are staggered with each other, pushing the toothed sealer to slide on the inner wall of the bottom end of the sealing cover shell so that the two staggered toothed sealers engage with each other and seal the gap formed by the first sealing shell and the second sealing shell in the sealing cover shell.

[0013] Furthermore, the toothed sealer includes a translation rod fixed to the lower surface of the fourth articulated seat, and a plurality of dynamic sealing blocks fixed in sequence to the side surfaces of the two translation rods close to each other, and the dynamic sealing blocks are inserted into the gap between the dynamic sealing blocks on the other translation rod so that the dynamic sealing blocks on the two translation rods fill each other.

[0014] Furthermore, the toothed sealer further comprises static sealing blocks fixed to the inner wall surfaces of the bottom ends of the first sealing shell and the second sealing shell respectively, so as to fill the gaps that cannot be sealed by the toothed sealer.

[0015] Furthermore, a humidity sensor is fixed inside the second sealed shell, and the humidity information inside the second sealed shell and the first sealed shell is detected by the humidity sensor.

[0016] Furthermore, two connecting ears are fixed on the outer surfaces of both ends of the first sealing shell and the second sealing shell from top to bottom, an anti-overflow tube is fixed between the two connecting ears on the same side, and a third sealing packing is fixed on the inner surface of the anti-overflow tube. The third sealing packing is passed between the two connecting ears to reduce the gap between the first sealing shell and the second sealing shell after connection.

[0017] Furthermore, a liquid outlet component is provided at the bottom end of the sealing cover, and the liquid outlet component includes a drainage pipe passing through the bottom end shell of the first sealing shell and the second sealing shell, and a sealing mechanism provided at the top end of the two drainage pipes. The opening at the top end of the drainage pipe is sealed by the sealing mechanism to prevent the internal components of the sealing cover from being affected by the external environment.

[0018] Furthermore, the sealing mechanism includes a float abutting against the upper surface of the drain pipe, and a fifth hinged seat rotatably connected to the float through a rotating shaft. The two fifth hinged seats are respectively fixed on the inner walls of the bottom ends of the first sealing shell and the second sealing shell. When excessive liquid accumulates at the bottom end of the sealing cover shell, it is discharged through the drain pipe. Since the drain pipe is connected to the discharge location through a hose, the accumulated liquid is discharged.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the present invention can seal the cryogenic valve through the first sealing mechanism, and the steam generated by the leakage can be discharged into the ditch through the designated discharge port, so that the unit can operate normally until the maintenance period without endangering personal safety, and then the valve can be repaired, avoiding personal and equipment safety caused by steam leakage on site.

[0021] Secondly, the present invention can seal the low-temperature valve through the first sealing mechanism and block the gap of the sealing cover through the second sealing mechanism, thereby sealing the low temperature through multiple sealing methods and guiding the discharge of steam traps so that the steam traps can be accurately discharged into the designated discharge port.

[0022] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 A top view of the present invention;

[0025] Figure 3for Figure 2 Sectional view along line AA;

[0026] Figure 4 for Figure 2 Cross-sectional view along line BB;

[0027] Figure 5 Schematic diagram of the internal structure of the sealing cover of the present invention;

[0028] Figure 6 An exploded view of the present invention;

[0029] Figure 7 It is a structural schematic diagram of the telescopic assembly of the present invention;

[0030] Figure 8 for Figure 6 A magnified view of the structure of area A.

[0031] In the figure: 10, cryogenic valve; 20, liquid outlet pipe; 30, sealing cover; 31, first sealing shell; 32, second sealing shell; 33, first sealing packing; 34, connecting ear; 35, third sealing packing; 36, overflow prevention pipe; 40, sealing assembly; 41, first sealing mechanism; 411, sliding sealing ring; 412, second sealing packing; 42, second sealing mechanism; 50, telescopic assembly; 51, first telescopic mechanism; 511, third An articulated seat; 512, a first connecting rod; 513, a second articulated seat; 52, a second telescopic mechanism; 521, a third articulated seat; 522, a second connecting rod; 523, a fourth articulated seat; 524, a toothed sealer; 5241, a translation rod; 5242, a dynamic sealing block; 5243, a static sealing block; 53, a telescopic motor; 60, a liquid outlet assembly; 61, a drain pipe; 62, a sealing mechanism; 621, a float; 622, a fifth articulated seat. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which the present invention pertains. The terminology used herein in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] For example, please refer to the attached Figure 1-8 A low-temperature, low-pressure valve sealing device includes a low-temperature valve 10, wherein the liquid inlet and liquid outlet ends of the low-temperature valve 10 are both connected to a liquid outlet pipe 20 via flanges, a sealing housing 30 is provided on the outside of the low-temperature valve 10, a sealing assembly 40 is provided inside the sealing housing 30, and telescopic assemblies 50 are inserted into both ends of the sealing housing 30;

[0036] The sealing housing 30 includes a first sealing housing 31 sleeved on one end of the cryogenic valve 10, and a second sealing housing 32 sleeved on the other end of the cryogenic valve 10. The first sealing housing 31 and the second sealing housing 32 are fixedly connected, and a first sealing packing 33 is fixed to the surfaces of the first sealing housing 31 and the second sealing housing 32 on the side close to each other.

[0037] The sealing assembly 40 includes a first sealing mechanism 41 provided inside the sealing cover 30 and sleeved on the outside of the low-temperature valve 10, and a second sealing mechanism 42 provided at the bottom end of the first sealing mechanism 41 and connected to the actuator end of the telescopic assembly 50. The first sealing mechanism 41 includes a sliding sealing ring 411 sleeved on the outside of the flange and connected to the actuator end of the telescopic assembly 50, and a second sealing packing 412 provided on the inner ring surface of the sliding sealing ring 411.

[0038] For details, please refer to the attached Figure 1 、 4, 5 and 6, the telescopic assembly 50 includes a telescopic motor 53 fixed to one end of the first sealed shell 31 and the second sealed shell 32 away from each other, a first telescopic mechanism 51 connected to the driving end of the first sealing mechanism 41, and a second telescopic mechanism 52 connected to the driving end of the second sealing mechanism 42, the first telescopic mechanism 51 includes a first hinge seat 511 fixed to the telescopic motor 53 and extending to both sides of the surface of one end inside the sealing cover 30, a first connecting rod 512 rotatably connected to one end of the telescopic rod away from the telescopic motor 53 through a rotating shaft, and a first connecting rod 512 connected to the first connecting rod 512 through a rotating shaft. A second hinged seat 513 rotatably connected to one end of the telescopic rod away from the telescopic motor 53 is fixed to the outer surface of the sliding sealing ring 411. The second telescopic mechanism 52 includes a third hinged seat 521 fixed to the telescopic rod of the telescopic motor 53 and extending to the lower surface of one end inside the sealing cover 30, a second connecting rod 522 rotatably connected to the third hinged seat 521 via a rotating shaft, and a fourth hinged seat 523 rotatably connected to the end of the second connecting rod 522 away from the third hinged seat 521. A toothed sealer 524 is fixed to the lower surface of the fourth hinged seat 523, and the two toothed sealers 524 are staggered with each other.

[0039] It should be noted that, in this embodiment, the telescopic motor 53 drives the first telescopic mechanism 51 and the second telescopic mechanism 52 to operate, the first telescopic mechanism 51 drives the sliding sealing ring 411 to slide on the outer surface of the flange, and the second telescopic mechanism 52 drives the second sealing mechanism 42 to seal the gap between the bottom of the first sealing shell 31 and the second sealing shell 32.

[0040] Furthermore, when the telescopic rod of the telescopic motor 53 pushes the first hinge seat 511, the first connecting rod 512 rotatably connected to the first hinge seat 511 is rotatably connected to the second hinge seat 513, and the second hinge seat 513 is fixed to the outer surface of the sliding sealing ring 411, so that the first connecting rod 512 pushes the sliding sealing ring 411, causing the sliding sealing ring 411 to slide on the outer surface of the flange, thereby sealing the gap between the two adjacent flanges through the sliding sealing ring 411;

[0041] Furthermore, the third hinge seat 521 is driven to translate by the telescopic motor 53, and the second connecting rod 522 is driven to translate by the third hinge seat 521. Since the second connecting rod 522 and the fourth hinge seat 523 on the toothed sealer 524 are rotatably connected via a rotating shaft, the toothed sealer 524 is pushed to slide on the inner wall of the bottom end of the sealing cover shell 30, so that the two staggered toothed sealers 524 engage with each other and seal the gap formed by the first sealing shell 31 and the second sealing shell 32 in the sealing cover shell 30.

[0042] For details, please refer to the attached Figure 6 and 7 The toothed sealer 524 includes a translation rod 5241 fixed to the lower surface of the fourth hinged seat 523, and a plurality of dynamic sealing blocks 5242 sequentially fixed to the surfaces of two translation rods 5241 adjacent to each other. The toothed sealer 524 also includes static sealing blocks 5243 fixed to the inner wall surfaces of the bottom ends of the first sealing shell 31 and the second sealing shell 32, respectively. A humidity sensor 321 is fixed inside the second sealing shell 32.

[0043] It should be noted that, in this embodiment, when the second connecting rod 522 pushes the translation rod 5241 to translate, the translation rod 5241 pushes the dynamic sealing block 5242 to translate, so that the dynamic sealing block 5242 is inserted into the gap between the dynamic sealing blocks 5242 on the other translation rod 5241, so that the dynamic sealing blocks 5242 on the two translation rods 5241 fill each other.

[0044] Furthermore, the static sealing block 5243 fills the gap that the toothed sealer 524 cannot seal;

[0045] Furthermore, the humidity information inside the second sealed shell 32 and the first sealed shell 31 is detected by a humidity sensor 321 with model number SETF012, and an electrical signal carrying the humidity information is sent to the inside of the PLC control connected thereto through the communication end of the humidity sensor 321, so as to determine through the PLC control whether the humidity inside the sealed cover 30 exceeds the set value, thereby determining whether the low-temperature valve 10 is leaking.

[0046] For details, please refer to the attached Figure 3 and 7 , two connecting ears 34 are fixed on the outer surfaces of both ends of the first sealing shell 31 and the second sealing shell 32 from top to bottom, an overflow prevention tube 36 is fixed between the two connecting ears 34 on the same side, and a third sealing packing 35 is fixed on the inner surface of the overflow prevention tube 36. The bottom end of the sealing cover 30 is provided with a liquid outlet component 60, and the liquid outlet component 60 includes a drain pipe 61 passing through the bottom end shell of the first sealing shell 31 and the second sealing shell 32, and a sealing mechanism 62 provided at the top of the two drain pipes 61, the sealing mechanism 62 includes a float 621 abutting against the upper surface of the drain pipe 61, and a fifth hinge seat 622 rotatably connected to the float 621 through a rotating shaft, and the two fifth hinge seats 622 are respectively fixed on the inner walls of the bottom ends of the first sealing shell 31 and the second sealing shell 32;

[0047] It should be noted that, in this embodiment, bolts are passed through the connecting ears 34 to connect the first sealing shell 31 and the second sealing shell 32 to each other, and a third sealing packing 35 is passed between the two connecting ears 34 to reduce the gap between the first sealing shell 31 and the second sealing shell 32 after connection.

[0048] Furthermore, the liquid accumulated inside the sealed housing 30 due to leakage from the cryogenic valve 10 is discharged through the drain pipe 61, and the opening at the top of the drain pipe 61 is blocked by the sealing mechanism 62 to prevent the internal components of the sealed housing 30 from being affected by the external environment.

[0049] Furthermore, when a certain amount of liquid accumulates at the bottom of the sealing cover 30, the buoyancy generated by the liquid lifts up the float 621 so that the float 621 rotates around the fifth hinge seat 622. When too much liquid accumulates at the bottom of the sealing cover 30, it is discharged through the drain pipe 61. Since the drain pipe 61 is connected to the discharge location through a hose, the accumulated liquid is discharged.

[0050] The specific operation mode of the present invention is as follows:

[0051] When the cryogenic valve 10 is working, the humidity information inside the second sealed shell 32 and the first sealed shell 31 is detected by the humidity sensor 321 with the model number SETF012 inside the sealed shell 30, and the electrical signal with the humidity information is sent to the inside of the PLC control connected thereto through the communication end of the humidity sensor 321, so as to judge whether the humidity inside the sealed shell 30 exceeds the set value through the PLC control, thereby judging whether the cryogenic valve 10 is leaking. When the cryogenic valve 10 leaks and requires emergency treatment, the telescopic rod of the telescopic motor 53 on the sealed shell 30 pushes the first hinge seat 511, because the first connecting rod 512 rotatably connected to the first hinge seat 511 is rotatably connected to the second hinge seat 513, and the second hinge seat 513 is fixed to the outer surface of the sliding sealing ring 411, the first connecting rod 512 pushes the sliding sealing ring 411, causing the sliding sealing ring 411 to slide on the outer surface of the flange, thereby sealing the gap between the two adjacent flanges through the sliding sealing ring 411. Moreover, because the inner ring surface of the sliding sealing ring 411 is provided with the first sealing packing 33, the gap between the sliding sealing ring 411 and the outer surface of the flange is further reduced, thereby improving the sealing effect;

[0052] The third hinge seat 521 is driven to translate by the telescopic motor 53, and the second connecting rod 522 is driven to translate by the third hinge seat 521. Since the second connecting rod 522 and the fourth hinge seat 523 on the toothed sealer 524 are rotatably connected by the rotating shaft, the toothed sealer 524 is pushed to slide on the inner wall of the bottom end of the sealing cover 30, so that the two staggered toothed sealers 524 are engaged with each other and the gap formed by the first sealing shell 31 and the second sealing shell 32 in the sealing cover 30 is blocked. When a certain amount of liquid accumulates at the bottom end of the sealing cover 30, the buoyancy generated by the liquid lifts up the float 621 so that the float 621 rotates around the fifth hinge seat 622. When too much liquid accumulates at the bottom end of the sealing cover 30, it is discharged through the drain pipe 61. Since the drain pipe 61 is connected to the discharge location through a hose, the accumulated liquid is discharged.

[0053] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A low-temperature and low-pressure valve sealing device, comprising a low-temperature valve (10), characterized in that: The liquid inlet and outlet ends of the cryogenic valve (10) are both connected to a liquid outlet pipe (20) via flanges; a sealing housing (30) is provided on the outside of the cryogenic valve (10); a sealing assembly (40) is provided inside the sealing housing (30); and telescopic assemblies (50) are inserted through both ends of the sealing housing (30); The sealing cover (30) comprises a first sealing shell (31) sleeved on one end of the cryogenic valve (10), and a second sealing shell (32) sleeved on the other end of the cryogenic valve (10), the first sealing shell (31) and the second sealing shell (32) being fixedly connected, and a first sealing packing (33) is fixed on the surfaces of the first sealing shell (31) and the second sealing shell (32) on one side close to each other; The sealing assembly (40) includes a first sealing mechanism (41) provided inside the sealing housing (30) and sleeved on the outside of the cryogenic valve (10), and a second sealing mechanism (42) provided at the bottom end of the first sealing mechanism (41) and connected to the execution end of the telescopic assembly (50), the first sealing mechanism (41) including a sliding sealing ring (411) sleeved on the outside of the flange and connected to the execution end of the telescopic assembly (50), and a second sealing packing (412) provided on the inner ring surface of the sliding sealing ring (411); The telescopic assembly (50) comprises a telescopic motor (53) fixed to one end of the first sealing shell (31) and the second sealing shell (32) away from each other, a first telescopic mechanism (51) connected to the driving end of the first sealing mechanism (41), and a second telescopic mechanism (52) connected to the driving end of the second sealing mechanism (42); The first telescopic mechanism (51) comprises a first hinge seat (511) fixed to the surfaces of both sides of one end of the telescopic motor (53) extending to the interior of the sealing cover (30), a first connecting rod (512) rotatably connected to the first hinge seat (511) via a rotating shaft at one end of the telescopic rod away from the telescopic motor (53), and a second hinge seat (513) rotatably connected to the first connecting rod (512) via a rotating shaft at one end of the telescopic rod away from the telescopic motor (53), wherein the second hinge seat (513) is fixed to the outer surface of the sliding sealing ring (411); The second telescopic mechanism (52) includes a telescopic rod fixed to the telescopic motor (53) and extending to a third hinge seat (521) on the lower surface of one end inside the sealing cover (30), a second connecting rod (522) rotatably connected to the third hinge seat (521) via a rotating shaft, and a fourth hinge seat (523) rotatably connected to one end of the second connecting rod (522) away from the third hinge seat (521), a toothed sealer (524) is fixed to the lower surface of the fourth hinge seat (523), and the two toothed sealers (524) are arranged alternately.

2. A low-temperature and low-pressure valve sealing device according to claim 1, characterized in that: The toothed sealer (524) comprises a translation rod (5241) fixed to the lower surface of the fourth hinge seat (523), and a plurality of dynamic sealing blocks (5242) fixed in sequence to the side surfaces of two translation rods (5241) close to each other.

3. A low-temperature and low-pressure valve sealing device according to claim 2, characterized in that: The toothed sealer (524) further comprises static sealing blocks (5243) respectively fixed to the inner wall surfaces of the bottom ends of the first sealing shell (31) and the second sealing shell (32).

4. A low-temperature and low-pressure valve sealing device according to claim 1, characterized in that: A humidity sensor (321) is fixed inside the second sealed shell (32).

5. The low-temperature and low-pressure valve sealing device according to claim 1, characterized in that: Two connecting ears (34) are fixed on the outer surfaces of both ends of the first sealing shell (31) and the second sealing shell (32) from top to bottom, an anti-overflow tube (36) is fixed between the two connecting ears (34) on the same side, and a third sealing packing (35) is fixed on the inner surface of the anti-overflow tube (36).

6. A low-temperature and low-pressure valve sealing device according to claim 5, characterized in that: A liquid outlet assembly (60) is provided at the bottom end of the sealing housing (30), and the liquid outlet assembly (60) comprises a liquid discharge pipe (61) passing through the bottom shells of the first sealing housing (31) and the second sealing housing (32), and a sealing mechanism (62) provided at the top ends of the two liquid discharge pipes (61).

7. A low-temperature and low-pressure valve sealing device according to claim 6, characterized in that: The sealing mechanism (62) comprises a float (621) abutting against the upper surface of the liquid discharge pipe (61), and a fifth hinge seat (622) rotatably connected to the float (621) via a rotating shaft. The two fifth hinge seats (622) are respectively fixed to the inner walls of the bottom ends of the first sealing shell (31) and the second sealing shell (32).

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