Explosion-proof heat preservation device for ultralow-temperature liquefied gas storage tank

Abstract

The utility model belongs to the technical field of ultralow-temperature liquefied gas storage, and particularly relates to an anti-explosion heat preservation device for an ultralow-temperature liquefied gas storage tank, which comprises a storage tank, a pipe body is arranged on the storage tank, and an anti-explosion component is arranged on the pipe body. According to the anti-explosion heat preservation device for the ultralow-temperature liquefied gas storage tank, when the air pressure in the storage tank exceeds a set threshold value, high-pressure gas can rapidly enter an inner cavity of a threaded pipe through a vent hole of a pipe body, and a piston in the inner cavity moves upwards under the action of gas pressure and moves along with displacement of the piston; the originally shielded multiple groups of linearly distributed air outlet holes are sequentially opened, the air outlet holes in gradient arrangement can be opened step by step according to the air pressure, and when the air pressure is sharply increased, all the air outlet holes are simultaneously started, so that the pressure relief efficiency is remarkably improved. And meanwhile, the gas after pressure relief enters the outer cavity through the gas outlet hole and then is directionally conveyed to the collecting tank through the gas guide pipe, so that safe pressure relief and gas recovery are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of super low temperature liquefied gas storage, specifically to an explosion-proof heat preservation device for super low temperature liquefied gas storage tank. BACKGROUND

[0002] The super low temperature liquefied gas storage tank is a special container for storing super low temperature liquefied gases such as liquid hydrogen, liquid oxygen, liquid nitrogen and liquid helium, and usually needs to have good heat insulation performance, low temperature resistance and safety performance.

[0003] At present, the pressure relief channels of most existing storage tanks may be relatively single in design and cannot be flexibly adjusted according to the gas pressure. When the gas pressure slightly exceeds the set threshold, the effective pressure relief channel may not be opened in time, resulting in untimely pressure relief. When the gas pressure rises sharply, the limited opening degree of the pressure relief channel may not be able to quickly discharge a large amount of high-pressure gas, thereby increasing the risk of safety accidents such as explosion of the storage tank. Moreover, the existing storage tank may not have a gas recovery function, and the gas is directly discharged into the environment during the pressure relief process, which not only wastes gas resources but also may pollute the environment. In view of this, the utility model provides an explosion-proof heat preservation device for super low temperature liquefied gas storage tank. SUMMARY

[0004] The utility model mainly aims at providing an explosion-proof heat preservation device for super low temperature liquefied gas storage tank, which can solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the utility model provides an explosion-proof heat preservation device for super low temperature liquefied gas storage tank, which comprises a storage tank, a pipe body provided on the storage tank, an explosion-proof assembly provided on the pipe body, and the explosion-proof assembly comprises:

[0006] A threaded pipe is threadedly connected with the pipe body, the threaded pipe is provided with an inner cavity and an outer cavity, the inner cavity and the outer cavity are connected in communication through a gas outlet hole, the gas outlet hole is provided with multiple groups and is linearly distributed on the inner wall of the threaded pipe.

[0007] A gas guide pipe is connected with the top of the threaded pipe, and the end of the gas guide pipe away from the threaded pipe is connected with a collection tank.

[0008] Preferably, the bottom of the threaded pipe is connected with a jack rod, and the bottom of the threaded pipe is provided with a gas inlet hole.

[0009] Preferably, the inner wall of the inner cavity is provided with a piston, the outer wall of the piston is connected with a rod body, the rod body penetrates the inner wall of the threaded pipe and is slidably connected with the inner wall, and the piston and the inner wall of the inner cavity are elastically connected through a spring.

[0010] Preferably, the inner wall of the pipe body is connected with a fixing frame, and the fixing frame is penetrated by a guide rod and is slidably connected with the guide rod.

[0011] Preferably, the guide rod top end is connected with a sealing plug, and the sealing plug is elastically connected with the fixing frame through a spring.

[0012] Preferably, the inner wall and the outer wall of the pipe body are respectively embedded with sealing ring one and sealing ring two, and the outer wall of the threaded pipe is respectively connected with annular block one and annular block two.

[0013] Preferably, the lower end of the pipe body is provided with a valve body.

[0014] The utility model provides a kind of explosion-proof heat preservation device for ultra-low temperature liquefied gas storage tank.There is following beneficial effect:

[0015] (1), the explosion-proof heat preservation device for ultra-low temperature liquefied gas storage tank, when the internal pressure of storage tank exceeds the set threshold value, high-pressure gas can quickly enter the inner cavity of threaded pipe through the vent hole of pipe body.The piston in the inner cavity moves upward under the action of gas pressure, with the displacement of piston, the originally shielded multiple groups of linear distribution of gas outlet hole are opened in turn, this gradient arrangement gas outlet hole can be opened gradually according to the size of air pressure, when air pressure rises sharply, all gas outlet holes are used simultaneously, significantly improve the pressure relief efficiency.At the same time, the gas after pressure relief enters the outer cavity through the gas outlet hole, and then is directionally transported to the collection tank through the gas guide pipe, realizes safe pressure relief and gas recovery, not only guarantees the safe operation of storage tank, but also avoids the waste of gas resources, with significant economic benefit and safety benefit.

[0016] (2), the explosion-proof heat preservation device for ultra-low temperature liquefied gas storage tank, before disassembling threaded pipe, manually close valve body to cut off gas passage, when reversely rotating threaded pipe to separate it from pipe body, the pressure of the piston is released to the sealing plug, the elastic potential energy of the compressed spring is quickly released, the sealing plug is pushed to move upward, and is accurately embedded into the vent hole to form mechanical seal, combined with the closed valve body, to form the second resealing system.This double-sealing design can effectively prevent gas leakage during equipment installation, operation and maintenance, and ensure that the equipment is always in a safe and reliable working state. ACCURACY

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creating labor.

[0018] Figure 1 It is the whole three-dimensional structure schematic diagram of the utility model;

[0019] Figure 2 It is the internal structure schematic diagram of the pipe body and threaded pipe of the utility model;

[0020] Figure 3 It is the three-dimensional structure schematic view of the threaded pipe part of the utility model;

[0021] Figure 4 It is the three-dimensional structure schematic view of the threaded pipe part of the utility model; Figure 2 It is the three-dimensional structure schematic view of the threaded pipe part of the utility model;

[0022] Figure 5 It is the three-dimensional structure schematic view of the threaded pipe part of the utility model; Figure 2 It is the three-dimensional structure schematic view of the threaded pipe part of the utility model.

[0023] Explanation of the attached drawing:

[0024] 1, storage tank;2, pipe body;21, valve body;22, sealing ring one;23, fixing frame;24, guide rod;25, sealing plug;26, sealing ring two;3, threaded pipe;31, gas guide pipe;32, collection tank;33, inner cavity;331, piston;332, rod body;333, gas outlet hole;34, air inlet hole;35, ejector rod;36, outer cavity;37, annular block one;38, annular block two.

[0025] The utility model discloses the realization, functional characteristics and advantages will be further described with reference to the embodiment. Specific implementation

[0026] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] Please refer to Figures 1-5 The utility model discloses a kind of explosion-proof heat preservation devices for ultra-low temperature liquefied gas storage tank, including storage tank 1, storage tank 1 is equipped with pipe body 2, pipe body 2 lower end portion is equipped with valve body 21, pipe body 2 is equipped with explosion-proof assembly.

[0028] In the embodiment of the utility model, in order to be able to realize to the storage tank 1 pressure relief, specifically, explosion-proof assembly includes threaded pipe 3, threaded pipe 3 is connected with pipe body 2 by screw thread, threaded pipe 3 is equipped with inner cavity 33 and outer cavity 36, inner cavity 33 and outer cavity 36 are communicated by gas outlet hole 333, gas outlet hole 333 is equipped with multiple groups, and linearly distributed in the inner wall of threaded pipe 3, gas guide pipe 31 is connected with the top of threaded pipe 3, the end of gas guide pipe 31 away from threaded pipe 3 is connected with collection tank 32;

[0029] Further, threaded pipe 3 bottom is connected with ejector rod 35, and threaded pipe 3 bottom is provided with air inlet hole 34;

[0030] Further, the inner wall of the inner cavity 33 is provided with a piston 331, the outer wall of the piston 331 is connected with a rod body 332, the rod body 332 penetrates the inner wall of the threaded pipe 3 and is in sliding connection with the inner wall, and the piston 331 is in elastic connection with the inner wall of the inner cavity 33 through a spring;

[0031] Further, the inner wall of the pipe body 2 is connected with a fixing frame 23, the fixing frame 23 is penetrated by a guide rod 24 and is in sliding connection with the guide rod 24, the top end of the guide rod 24 is connected with a sealing plug 25, and the sealing plug 25 is in elastic connection with the fixing frame 23 through a spring;

[0032] Further, the inner wall and the outer wall of the pipe body 2 are respectively embedded with a sealing ring one 22 and a sealing ring two 26, the outer wall of the threaded pipe 3 is respectively connected with an annular block one 37 and an annular block two 38, after the pipe body 2 and the threaded pipe 3 complete the closing action, the annular block one 37 and the annular block two 38 will press the sealing ring one 22 and the sealing ring two 26 respectively. This process makes the sealing ring one 22 and the sealing ring two 26 fully deform and completely cover the outer wall of the annular block one 37 and the annular block two 38, forming a double sealing barrier, which significantly enhances the sealing performance between the threaded pipe 3 and the pipe body 2;

[0033] In the utility model, when installing, the threaded pipe 3 is first tightly connected with the pipe body 2 by screwing. In this process, the top rod 35 at the end of the threaded pipe 3 gradually presses down the sealing plug 25, so that it moves downward against the pre-tightening force of the bottom spring, thereby opening the air hole of the pipe body 2. At this time, the spring is elastically deformed during the pressure process, providing power reserve for subsequent sealing reset. Then the valve body 21 is opened, opening the gas flow path between the storage tank 1 and the subsequent pressure relief channel;

[0034] When the internal gas pressure of the storage tank 1 exceeds the set threshold value, the high-pressure gas enters the inner cavity 33 through the air hole of the pipe body 2 and the gas inlet hole 34 of the threaded pipe 3, and the gas pressure drives the piston 331 to move upward along the axis of the threaded pipe 3. As the displacement of the piston 331 increases, a plurality of linearly distributed gas outlet holes 333 originally blocked by the piston 331 are sequentially opened. These gradient arranged gas outlet holes 333 can be opened step by step according to the gas pressure. When the gas pressure rises sharply, all the gas outlet holes 333 are opened at the same time, significantly improving the pressure relief efficiency. The gas enters the outer cavity 36 through the gas outlet hole 333, and is then directed to the collection tank 32 through the gas guide pipe 31, realizing safe pressure relief and gas recovery;

[0035] Before disassembling the threaded pipe 3, the valve body 21 needs to be manually closed to cut off the gas path, and the threaded pipe 3 is separated from the pipe body 2 by rotating it in the opposite direction. At this time, the top rod 35 releases the pressure on the sealing plug 25, and the spring quickly releases the elastic potential energy, pushing the sealing plug 25 upward and accurately embedding it into the air hole to form a mechanical seal. Combined with the closed valve body 21, a double sealing system is formed, which effectively prevents residual gas leakage and ensures the safety of equipment maintenance.

[0036] The above merely describes preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. An explosion-proof insulation device for a cryogenic liquefied gas storage tank, comprising a storage tank (1), a pipe body (2) provided on the storage tank (1), and an explosion-proof component provided on the pipe body (2), characterized in that: The explosion-proof component includes: Threaded pipe (3), the threaded pipe (3) is threadedly connected to the pipe body (2), the threaded pipe (3) is provided with an inner cavity (33) and an outer cavity (36), the inner cavity (33) and the outer cavity (36) are connected through an air outlet (333), the air outlet (333) is provided in multiple sets and is linearly distributed on the inner wall of the threaded pipe (3); A gas guide pipe (31) is connected to the top of a threaded pipe (3), and a collection tank (32) is connected to the end of the gas guide pipe (31) away from the threaded pipe (3).

2. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 1, characterized in that: The bottom of the threaded tube (3) is connected to a top rod (35), and an air inlet (34) is opened at the bottom of the threaded tube (3).

3. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 1, characterized in that: The inner wall of the inner cavity (33) is provided with a piston (331), and the outer wall of the piston (331) is connected with a rod (332). The rod (332) passes through the inner wall of the threaded tube (3) and is slidably connected to the inner wall. The piston (331) and the inner wall of the inner cavity (33) are elastically connected by a spring.

4. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 1, characterized in that: The inner wall of the tube (2) is connected to a fixing frame (23), which is penetrated by a guide rod (24) and slidably connected to the guide rod (24).

5. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 4, characterized in that: The top of the guide rod (24) is connected to a sealing plug (25), which is elastically connected to the fixing frame (23) by a spring.

6. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 1, characterized in that: The inner and outer walls of the tube body (2) are respectively fitted with sealing ring one (22) and sealing ring two (26), and the outer wall of the threaded tube (3) is respectively connected with annular block one (37) and annular block two (38).

7. The explosion-proof insulation device for a cryogenic liquefied gas storage tank according to claim 1, characterized in that: The lower part of the pipe (2) is provided with a valve body (21).

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