CN113418134A

CN113418134A - Liquid nitrogen storage jar with vapour-pressure type safety protection function

Info

Publication number: CN113418134A
Application number: CN202110555769.XA
Authority: CN
Inventors: 刘畅; 章忠韶
Original assignee: Changsha Zhongyi Gas Co ltd
Current assignee: Changsha Zhongyi Gas Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2021-09-21
Anticipated expiration: 2041-05-21
Also published as: CN113418134B

Abstract

The utility model relates to a liquid nitrogen storage jar with vapour-pressure type safety protection function, it includes shell and inner bag, the inner bag is fixed to be set up in the shell, be hollow structure between shell and the inner bag, be provided with the protective sheath between shell and the inner bag, it has high-pressure gas to fill between protective sheath and the shell, the fixed communicating pipe that is provided with on the shell, space between the one end intercommunication protective sheath of communicating pipe and the inner bag, the inner chamber of other end intercommunication inner bag, set up the valve member that is used for opening communicating pipe when atmospheric pressure reduces between shell and protective sheath on communicating pipe. When the crack appears on the shell of storage jar, the high-pressure gas between shell and the protective sheath escapes, opens communicating pipe for the liquid nitrogen of area pressure storage volatilizees nitrogen gas and gets into between inner bag and the protective sheath in the inner bag, promotes the inner wall in close contact with of protective sheath and shell, and this application has the effect that improves storage jar safety protection performance and play thermal-insulated heat preservation to the liquid nitrogen in to the inner bag.

Description

Liquid nitrogen storage jar with vapour-pressure type safety protection function

Technical Field

The application relates to the field of low-temperature liquid storage equipment, in particular to a liquid nitrogen storage tank with a pneumatic safety protection function.

Background

Cryogenic liquid storage tanks are a compact, relatively self-contained cryogenic liquid storage facility with a variety of equipment (valves, safety systems, etc.). The liquid nitrogen tank can be generally divided into a liquid nitrogen storage tank and a liquid nitrogen transportation tank, wherein the storage tank is mainly used for standing storage of indoor liquid nitrogen and is not suitable for long-distance transportation in a working state; the liquid nitrogen transport tank is specially designed to be shockproof in order to meet the transport conditions.

The patent with the publication number of CN212745960U discloses a low-temperature storage liquid nitrogen tank, which comprises a tank body shell and a tank body inner container; the shell wall of the shell of the tank body is of a hollow structure; the inner container wall of the inner container of the tank body is of an internal hollow structure and is arranged in the shell of the tank body.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: liquid nitrogen container is in use such as transportation, because incorrect manipulation, causes the shell of the jar body easily and appears the not observable crack of naked eye, if not handle in time, when jar internal container broke, the crack on the shell was enlarged easily to the liquid nitrogen that spills over to bring the potential safety hazard to the experimenter.

Disclosure of Invention

In order to improve the safety protection performance of liquid nitrogen storage jar, this application provides a liquid nitrogen storage jar with vapour-pressure type safety protection function.

The application provides a liquid nitrogen storage jar with vapour-pressure type safety protection function adopts following technical scheme:

the utility model provides a liquid nitrogen storage jar with vapour-pressure type safety protection function, includes shell and inner bag, the inner bag is fixed to be set up in the shell, be hollow structure between shell and the inner bag, be provided with the protective sheath between shell and the inner bag, it has high-pressure gas to fill between protective sheath and the shell, the fixed communicating pipe that is provided with on the shell, space, the inner chamber of other end intercommunication inner bag between one end intercommunication protective sheath of communicating pipe and the inner bag, set up the valve member that is used for opening communicating pipe when atmospheric pressure reduces between shell and protective sheath on communicating pipe.

Through adopting above-mentioned technical scheme, when the crack appears on the shell of storage jar, high-pressure gas between shell and the protective sheath escapes, the atmospheric pressure between shell and protective sheath reduces, thereby trigger valve subassembly, will open communicating pipe, make the inner chamber intercommunication inner bag of inner bag and the protective sheath between the space, make the liquid nitrogen of area pressure storage in the inner bag wave and send nitrogen gas and get into between inner bag and the protective sheath, promote the inner wall in close contact with of protective sheath and shell, both the crack on the shutoff shell, make simultaneously to fill nitrogen gas between inner bag and the shell, play thermal-insulated heat retaining effect to the liquid nitrogen in the inner bag, improve the storage effect of liquid nitrogen.

Optionally, the valve assembly comprises a balance valve, and an inlet end of the balance valve is communicated with the inner cavity of the inner container.

Through adopting above-mentioned technical scheme, after the high-pressure gas between shell and protective sheath leaked, the atmospheric pressure that the balanced valve was close to inner bag and protective sheath one side reduced, and the inner chamber atmospheric pressure of inner bag is higher than inner bag outside atmospheric pressure, and the flow channel of balanced valve enlarges, and nitrogen gas in the inner bag inner chamber passes through communicating pipe and flows outside to the inner bag.

Optionally, an air pressure sensor is arranged on the inner wall of the shell, an alarm is arranged on the shell, a controller is arranged on the shell, and the controller is electrically connected with the air pressure sensor and the alarm.

Through adopting above-mentioned technical scheme, atmospheric pressure between shell and protective sheath reduces the back, and baroceptor turns into the electrical data with atmospheric pressure data, transmits the controller, mediates the processing back through the controller, is less than the settlement parameter at the atmospheric pressure value, and the siren is given to controller transmission signal to through the crack appears in siren suggestion staff storage jar shell, the staff of being convenient for in time shifts and maintains the storage jar.

Optionally, the valve assembly comprises a solenoid valve electrically connected to the controller.

By adopting the technical scheme, the electromagnetic valve is used as the valve component on the communicating pipe, after the air pressure between the shell and the protective sleeve is reduced to a set value, the controller controls the electromagnetic valve to be opened, so that the inner cavity of the liner is communicated with the space between the liner and the protective sleeve, and the electromagnetic valve works stably.

Optionally, a barometer is arranged on the housing and used for measuring the air pressure between the protective sleeve and the housing.

Through adopting above-mentioned technical scheme, the staff can lead to the barometer on the shell and in time know the atmospheric pressure between shell and the protective sheath to the staff of being convenient for in time maintains the storage jar.

Optionally, the protective sheath includes the tensile top layer, the surface that the tensile top layer is close to the inner bag covers there is fibre net cloth.

Through adopting above-mentioned technical scheme, the tensile top layer of protective sheath when laminating with the shell inner wall, can the crack on the shutoff shell to have better tensile ability, effectively reduce the damaged possibility in tensile top layer, simultaneously, utilize the inboard fibre net check cloth in tensile top layer, can further strengthen the tensile anti-crack ability of protective layer, the safety protection performance is better.

Optionally, a flexible filling layer covers the surface of the tensile surface layer close to the shell.

Through adopting above-mentioned technical scheme, flexible filling layer can with the crack complete laminating on the shell for when the protective sheath laminating was on the shell inner wall, it is better to the crack repair effect on the shell.

Optionally, an air guide grid is fixedly arranged on the inner wall of the shell, a hollow flow channel is arranged inside the air guide grid, and an air hole communicated with the hollow flow channel is formed in the outer wall of the air guide grid.

Through adopting above-mentioned technical scheme, when nitrogen gas in the inner bag flows to the space between inner bag and the protective sheath, the protective sheath is pressed close to the inner wall of shell to extrude the air between protective sheath and the shell, through the bleeder vent of extruding the air on the air guide net, follow the cavity runner in the air guide net gradually to shell fracture direction extrusion discharge, prevent effectively that remaining swell gas from causing the protective sheath to break between protective sheath and the shell, extension protective sheath life.

Optionally, a plurality of conductive wires are fixedly arranged on the inner wall of the housing, and one end of each conductive wire is connected with the housing and the other end of each conductive wire is connected with the protective sleeve.

Through adopting above-mentioned technical scheme, in storage jar transportation, the friction between protective sheath and inner bag and the shell produces static easily, and static leads to the shell through the conductor wire even, arranges the circular telegram object of external contact with electric charge through the shell again, can effectively prevent the electric charge gathering on the protective sheath, improves the security performance of storage jar.

Optionally, an installation disc is fixedly arranged between the shell and the inner container along the circumferential direction, the installation disc is close to the upper portion of the shell, the top of the protective sleeve is fixedly connected with the installation disc in a coaxial mode, a forking ring is fixedly arranged on the top of the protective sleeve in a coaxial mode, and the edge of the protective sleeve, away from the forking ring, is fixedly connected with the installation disc in a coaxial mode.

Through adopting above-mentioned technical scheme, make the top of protective sheath combine the bifurcation ring, be the herringbone and connect on the collar for the protective sheath is pressed close to or is pressed close to the shell to the inner bag when, and protective sheath and bifurcation ring can both be stably connected with the collar, cause the fatigue of protective sheath and collar junction to break away from, extension protective sheath life when effectively preventing the both sides of protective sheath to admit air respectively.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when a crack occurs on the shell of the storage tank, high-pressure gas between the shell and the protective sleeve escapes, the communicating pipe is opened, so that nitrogen is volatilized from liquid nitrogen stored in the liner under pressure and enters between the liner and the protective sleeve, the protective sleeve is pushed to be in close contact with the inner wall of the shell, the crack on the shell is sealed, meanwhile, the nitrogen is filled between the liner and the shell, the heat insulation effect is achieved on the liquid nitrogen in the liner, and the storage effect of the liquid nitrogen is improved;

2. during the transportation process of the storage tank, static electricity is easily generated by friction among the protective sleeve, the liner and the shell, the static electricity is communicated with the shell through the conducting wire, and then the charge is discharged to an electrified object contacted with the outside through the shell, so that the charge accumulation on the protective sleeve can be effectively prevented, and the safety of the storage tank is improved;

3. make the top of protective sheath combine the bifurcation ring, be the herringbone and connect on the collar for when the protective sheath is pressed close to or is pressed close to the shell to the inner bag, protective sheath and bifurcation ring can both be stably connected with the collar, cause the fatigue of protective sheath and collar junction to break away from, extension protective sheath life when effectively preventing the both sides of protective sheath from admitting air respectively.

Drawings

Fig. 1 is a schematic view of the overall structure of a storage tank in embodiment 1 of the present application.

Fig. 2 is a schematic view of a storage tank in section in the embodiment 1 of the present application.

Fig. 3 is a partially enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a schematic plan sectional view of a lower part of a tank wall of a storage tank in embodiment 1 of the present application.

Fig. 5 is a schematic view of the overall structure of a storage tank in embodiment 2 of the present application.

Description of reference numerals: 1. a housing; 11. an air guide grid; 12. a hollow flow passage; 13. air holes are formed; 14. a conductive wire; 2. an inner container; 3. a protective sleeve; 31. a tensile surface layer; 32. fiber mesh cloth; 33. a flexible filler layer; 4. a communicating pipe; 5. a valve assembly; 51. a balancing valve; 501. an electromagnetic valve; 6. an air pressure sensor; 61. a controller; 62. an alarm; 63. a barometer; 7. mounting a disc; 71. a bifurcated ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses liquid nitrogen storage jar with vapour-pressure type safety protection function.

Example 1

Referring to fig. 1 and 2, the storage tank includes a shell 1 and an inner container 2, the inner container 2 is disposed inside the shell 1, and a hollow structure is formed between the shell 1 and the inner container 2. The outer wall of the inner container 2 is coaxially welded and fixed with a circle of mounting disc 7 at a position close to the top of the inner container 2, and the outer edge of the mounting disc 7 is welded and fixed at a position close to the top on the inner wall of the shell 1. The outside of inner bag 2 is located the below cover of mounting disc 7 and is equipped with protective sheath 3, and the upper shed edge and the coaxial fixed connection of mounting disc 7 of protective sheath 3. Before the storage tank is delivered, a gap between the casing 1 and the protective sleeve 3 is filled with high-pressure gas, such as nitrogen, oxygen, and the like.

Referring to fig. 1 and 2, after the gas between the casing 1 and the protective cover 3 escapes due to the crack of the casing 1, the crack of the casing 1 is filled in so that the protective cover 3 can be attached to the inner wall of the casing 1, and the casing 1 is further connected with a communication pipe 4. One end of the communicating pipe 4 is connected to the inner container 2 after penetrating through the shell 1 and is communicated with the inner cavity inside the inner container 2; the other end of the communicating pipe 4 passes through the shell 1 and then is connected to the mounting plate 7 and is communicated with the gap between the protective sleeve 3 and the inner container 2. Through communicating pipe 4, the liquid nitrogen that stores under pressure in inner bag 2 vaporizes, and nitrogen gas passes through communicating pipe 4 and gets into between protective sheath 3 and inner bag 2, promotes protective sheath 3 and shell 1 in close contact with.

In order to prevent the protective sleeve 3 at the opening of the communication pipe 4 from being damaged by high-pressure gas between the shell 1 and the protective sleeve 3 in a state of being empty in the inner container 2, the valve component 5 is arranged on the communication pipe 4. In this embodiment, the valve assembly 5 includes a pneumatic balance valve 51, the balance valve 51 is installed on the communication pipe 4, and an inlet end of the balance valve 51 is communicated with the inner cavity of the liner 2, and an outlet end of the balance valve 51 is communicated with a gap between the liner 2 and the protective sleeve 3. When the air pressure between the inner container 2 and the outer shell 1 is greater than the inner cavity air pressure of the inner container 2, the valve core of the balance valve 51 moves and enables the channel of the balance valve 51 to shrink until the channel is completely closed, and when the inner cavity air pressure of the inner container 2 is greater than the air pressure on the other side of the balance valve 51, the valve core of the balance valve 51 is pushed to open the channel of the balance valve 51.

In order to facilitate the worker to know the cracking condition of the storage tank shell 1, the shell 1 is provided with the barometer 63, and the detection end of the barometer 63 extends into the space between the shell 1 and the protective sleeve 3, so that the worker can conveniently and visually know whether the shell 1 leaks air. Meanwhile, in order to timely warn the staff that the storage tank shell 1 is broken, an air pressure sensor 6 is fixedly installed between the shell 1 and the protective sleeve 3 on the inner wall of the shell 1 in an adhering mode, a controller 61 and an alarm 62 are installed on the shell, and the controller 61 is electrically connected with the air pressure sensor 6 and the alarm 62 at the same time. The air pressure sensor 6 vertically converts the air pressure into an electric signal and transmits the electric signal to the controller 61, and by presetting a set value for the controller 61, when the pressure value transmitted by the air pressure sensor 6 is lower than the set value, the controller 61 transmits a signal to the alarm 62 and starts the alarm 62, thereby timely prompting a worker that the storage tank shell 1 is broken.

Referring to fig. 2 and 3, during the process of extruding the protective sheath 3 back and forth between the casing 1 and the inner cavity, the connecting position between the protective sheath 3 and the mounting disc 7 is easy to be damaged to cause air leakage, in order to improve the quality of connection of the protective sheath 3 at the junction with the mounting disc 7, the upper opening side wall of the protective sheath 3 is provided with a bifurcation ring 71 formed by the same body, and the edge of the bifurcation ring 71 far away from the protective sheath 3 is coaxially sealed and clamped on the bottom wall of the mounting disc 7. The bifurcated ring 71, the connecting sleeve and the mounting disc 7 form an isosceles triangle cavity at the joint.

Referring to fig. 2 and 4, in the using process of the protective sleeve 3, static electricity is easily generated due to self friction and friction between the protective sleeve 3 and the shell 1 and the inner cavity, and potential safety hazards are easily brought to high-pressure liquefied gas in the inner container 2 due to charge accumulation on the protective sleeve 3. In order to remove electricity from the protective sleeve 3 in time, a plurality of conductive wires 14 are welded and fixed on the inner wall of the shell 1, and the other ends of the conductive wires 14 are adhered to the protective sleeve 3.

Referring to fig. 2, 3 and 4, in the process of attaching the protective cover 3 to the inner wall of the housing 1 under the action of the gas pressure in the liner 2, the local air between the housing 1 and the protective cover 3 cannot be smoothly discharged, so that the protective cover 3 is easily subjected to hollowing, and the protective cover 3 is damaged due to the fact that the local tension of the protective cover 3 is large. To this end, the inner wall of the housing 1 is provided with an air guide grid 11, the air guide grid 11 is made of metal strips with arc-shaped cross sections, the metal strips are spliced into a whole in a grid shape, concave surfaces of the metal strips face the housing 1, and the spaces of the concave surfaces at the crossed nodes of the metal strips are communicated to form a hollow flow channel 12 of the air guide grid 11. The edges of the metal strips are provided with air holes 13, and the air holes 13 are communicated with hollow flow channels 12 leading to the air guide grids 11. The air guide grid 11 fully lays the inner wall of the shell 1 below the mounting plate 7.

Referring to fig. 4, in order to prolong the service life of the protective sheath 3, the protective sheath 3 employs a tensile surface layer 31, and the tensile surface layer 31 may employ a PE plastic film. In order to improve the tensile and anti-cracking capacity of the protective sleeve 3, fiber mesh cloth 32 is further hot-melt bonded on the surface of the tensile surface layer 31 close to the inner container 2, and the fiber mesh cloth 32 is glass fiber mesh cloth. In order to make the protective sleeve 3 better fit and seal the crack on the outer shell 1, the surface of the tensile surface layer 31 close to the outer shell 1 is covered with a flexible filling layer 33, in this embodiment, the shell of the flexible filling layer 33 is made of gel.

The implementation principle of the liquid nitrogen storage jar with vapour-pressure type safety protection function of this application embodiment is: when a crack occurs in the shell 1 of the storage tank, high-pressure gas escapes between the shell 1 and the protective sheath 3. The air pressure between the shell 1 and the protective sleeve 3 is reduced, so that the air pressure of one side of the balance valve 51 close to the inner container 2 is larger than the air pressure of the other side, the internal passage of the balance valve 51 is enlarged, and the communication pipe 4 is opened. The inner chamber of inner bag 2 communicates space between inner bag 2 and the protective sheath 3 for the liquid nitrogen of pressure storage in inner bag 2 volatilizes nitrogen gas and gets into between inner bag 2 and the protective sheath 3, promotes the inner wall in close contact with of protective sheath 3 and shell 1. The crack on the shell 1 is blocked, and meanwhile, nitrogen is filled between the inner container 2 and the shell 1, so that the effect of heat insulation and heat preservation on liquid nitrogen in the inner container 2 is achieved, and the storage effect of the liquid nitrogen is improved.

Example 2

Referring to fig. 2 and 5, embodiment 2 is different from embodiment 1 in that: the valve assembly 5 is different.

In this embodiment, valve assembly 5 includes solenoid valve 501, and solenoid valve 501 is mounted on communication pipe 4, and is used to open and close communication pipe 4. The electromagnetic valve 501 is electrically connected with the controller 61, and when the air pressure value between the protective sleeve 3 and the shell 1 is lower than the preset value on the controller 61, the controller 61 controls the electromagnetic valve 501 to be opened, so that the inner cavity of the inner container 2 is communicated with the gap between the inner container 2 and the protective sleeve 3.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a liquid nitrogen storage jar with vapour-pressure type safety protection function which characterized in that: including shell (1) and inner bag (2), inner bag (2) are fixed to be set up in shell (1), be hollow structure between shell (1) and inner bag (2), be provided with between shell (1) and inner bag (2) protective sheath (3), it has high-pressure gas to fill between protective sheath (3) and shell (1), the fixed communicating pipe (4) that is provided with on shell (1), space, the inner chamber of other end intercommunication inner bag (2) between one end intercommunication protective sheath (3) of communicating pipe (4) and inner bag (2), set up valve component (5) that are used for opening communicating pipe (4) when atmospheric pressure reduces between shell (1) and protective sheath (3) on communicating pipe (4).

2. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 1, characterized in that: the valve assembly (5) comprises a balance valve (51), and the inlet end of the balance valve (51) is communicated with the inner cavity of the inner container (2).

3. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 1, characterized in that: be provided with baroceptor (6) on the inner wall of shell (1), be provided with siren (62) on shell (1), be provided with controller (61) on shell (1), controller (61) are the electricity with baroceptor (6) and siren (62) and are connected.

4. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 3, characterized in that: the valve assembly (5) comprises a solenoid valve (501), and the solenoid valve (501) is electrically connected with the controller (61).

5. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 3, characterized in that: the air pressure gauge (63) is arranged on the shell (1), and the air pressure gauge (63) is used for measuring air pressure between the protective sleeve (3) and the shell (1).

6. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 1, characterized in that: protective sheath (3) are including tensile top layer (31), the surface that tensile top layer (31) are close to inner bag (2) covers there is fibre net cloth (32).

7. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 6, characterized in that: the surface of the tensile surface layer (31) close to the shell (1) is covered with a flexible filling layer (33).

8. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 1, characterized in that: the air guide device is characterized in that an air guide grid (11) is fixedly arranged on the inner wall of the shell (1), a hollow flow channel (12) is arranged inside the air guide grid (11), and an air hole (13) communicated with the hollow flow channel (12) is formed in the outer wall of the air guide grid (11).

9. The liquid nitrogen storage jar with vapour-pressure type safety protection function of claim 1, characterized in that: the inner wall of the shell (1) is fixedly provided with a plurality of conducting wires (14), one end of each conducting wire (14) is connected with the shell (1), and the other end of each conducting wire (14) is connected with the protective sleeve (3).

10. The liquid nitrogen storage tank with the air pressure type safety protection function according to any one of claims 1 to 9, characterized in that: fixed mounting disc (7) that is provided with along self circumference between shell (1) and inner bag (2), mounting disc (7) are close to the upper portion of shell (1), the top and the coaxial fixed connection of mounting disc (7) of protective sheath (3), the coaxial fixed branching ring (71) that is provided with in top of protective sheath (3), the edge and the coaxial fixed connection of mounting disc (7) of protective sheath (3) are kept away from to branching ring (71).