Anti-explosion relief device for anti-explosion opening of tank body of low-temperature liquid tank box

Abstract

The utility model discloses an explosion-proof relief device for an explosion-proof opening of a tank body of a low-temperature liquid tank box, which comprises an outer tank body, the explosion-proof opening is arranged on the outer tank body, a relief pipe is connected onto the explosion-proof opening, a cover plate is hermetically matched with the relief pipe, one end of the relief pipe, which is far away from the outer tank body, is a groove end, and the other end of the relief pipe is a groove end. The structure of the groove end is a conical concave inclined surface with a high outer edge and a low inner edge of the discharge pipe; the end, facing the explosion-proof opening, of the cover plate is a boss end, and the boss end is a conical convex inclined face attached to the conical concave inclined face. A sealing gasket is arranged between the conical concave inclined surface and the conical convex inclined surface, so that the cover plate forms a surface-contact extrusion sealing structure for the explosion-proof opening; according to the anti-explosion relief device for the anti-explosion opening of the tank body of the low-temperature liquid tank box, the conical surfaces are used for forming planar extrusion contact sealing, compared with linear contact sealing formed by the sealing rings in the prior art, the contact area is larger, and the better sealing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum heat preservation container technical field, concretely relates to a kind of explosion venting device for low-temperature liquid tank box tank body explosion vent. BACKGROUND

[0002] Low-temperature liquid tank box is a kind of equipment specially used for storing and transporting low-temperature liquid (such as liquid oxygen, liquid nitrogen, liquid argon, etc.). These tank boxes are designed with excellent thermal insulation performance to reduce the entry of heat, thereby maintaining the internal liquid at a low temperature state and preventing it from evaporating. Low-temperature liquid tank boxes are usually made of stainless steel, capable of withstanding physical changes under low-temperature conditions, and have certain safety measures, such as pressure relief valves, to ensure safety during transportation or storage even in the event of an accident.

[0003] Since a large amount of low-temperature liquid is stored in the inner container, and the low-temperature liquid has a certain positive pressure, if the inner container is damaged, the low-temperature liquid will leak into the interlayer space and rapidly absorb heat to vaporize and expand in volume, causing the pressure in the interlayer space to rapidly rise. At this time, if the pressure in the interlayer space cannot be vented in time, the tank body will be damaged, and even an explosion risk will occur.

[0004] In the prior art, Figure 7The explosion-proof port is provided on the tank shell, the explosion-proof port is sealed by a cover plate, a plurality of sealing rings are arranged on the sealing end of the cover plate, so that the cover plate is inserted into the explosion-proof port in an interference fit manner, a pressure difference is formed between the inside and outside of the cover plate by using the negative pressure in the interlayer space, and then the cover plate is pressed tightly on the explosion-proof port to form a seal, and it can be understood that the sealing ring forms linear contact sealing; when the inner container leaks, the pressure in the interlayer space increases, so that the pressure of the explosion-proof port is greater than the pressure outside the cover plate, thereby the cover plate is opened to release pressure; the defects are that 1, although the plurality of sealing rings improve the sealing effect, the interference fit manner also makes it difficult to open the cover plate, and the cover plate is often opened when the pressure in the interlayer space is higher than the pressure outside, thereby forming a situation that the pressure in the interlayer space is far higher than the pressure outside, and the pressure in the interlayer space cannot be released in time, which is easy to cause danger. 2, the cover plate structure cannot be automatically reset after being released; the cover plate must be manually installed and pressed tightly after the outer cap is disassembled, and then it can be used again, in order to solve the problem, patent application number: CN202222049308.8, a low-temperature container and an explosion-proof device thereof. The explosion-proof device is arranged on the shell of the low-temperature container. The explosion-proof device comprises a cylinder section, a cover plate, a cap, a guide rail assembly and an elastic member. The guide rail assembly comprises a sliding rail and a sliding block which are in sliding fit with each other, one of the sliding rail and the sliding block is fixedly connected with the cap, and the other is fixedly connected with the cover plate; the elastic member is connected with the cover plate; when the elastic member is in a natural state, the sliding block extends into the sliding rail. The cover plate is reset on the explosion-proof port by the elastic assembly, but the elastic assembly increases the force applied to the cover plate, which undoubtedly increases the pressure required to open the cover plate, that is, the pressure in the interlayer space must be increased again, not only the friction resistance of the interference fit of the sealing ring must be overcome, but also the pressure of the elastic member must be overcome to open the cover plate; this will further increase the pressure relief opening force of the interlayer space; in addition, the interference fit structure of the plurality of sealing rings is not conducive to the secondary sealing after resetting. Although the cover plate can be initially covered on the explosion-proof port under the pushing of the elastic member, the spring pushing force is not enough to make the cover plate fit in place due to the interference fit manner, and if the spring pushing force is increased without limit to overcome the problem, the cover plate is more difficult to open.

[0005] In view of the above, it is necessary to provide an explosion-proof relief device for a low-temperature liquid tank box tank body explosion-proof port to solve the above problems. The utility model discloses a kind of explosion-proof relief devices for low-temperature liquid tank box tank body explosion-proof port.

[0006] The utility model discloses a kind of explosion-proof relief devices for low-temperature liquid tank box tank body explosion-proof port.

[0007] In order to achieve the above object, the technical scheme of the utility model is as follows: a kind of explosion venting device for low-temperature liquid tank box tank body explosion vent, including outer tank body, and outer tank body is equipped with explosion vent, and explosion vent is connected with venting pipe, and cover plate is sealingly cooperated with venting pipe, the one end of venting pipe away from outer tank body is bevel end, and the structure of bevel end is the conical concave slope of outer edge high and inner edge low of venting pipe;The one end of cover plate towards explosion vent is boss end, and the boss end is conical convex slope that is attached to conical concave slope;Sealing gasket is equipped between conical concave slope and conical convex slope, so that cover plate forms the extrusion sealing structure of surface contact to explosion vent;

[0008] The one side of cover plate towards explosion vent is first action surface, and the one side away from explosion vent is second action surface, and first action surface is smaller than second action surface;

[0009] Guiding structure is arranged in explosion vent or between cover plate and cap, and is used to guide the movement of cover plate.

[0010] Further, it further includes pressure balance structure, which includes sleeve pipe part sleeved on the outer periphery of the venting pipe, the sleeve pipe part is coaxially arranged with the venting pipe, the root of the sleeve pipe part is sealingly and fixedly arranged on the outer tank body, and the other end is an open end, when the cover plate seals the explosion vent, the open end is attached to the conical convex slope to form a seal for the open end, forming a pressure regulating cavity around the outer periphery of the venting pipe, the pressure regulating cavity is filled with pressure gas, and the thrust of the pressure gas on the cover plate is used to offset the pressure on the second action surface.

[0011] Further, the first action surface and the cap are provided with an elastic member, and the thrust of the elastic member acts on the first action surface, so that the cover plate is guided and sealed by the guiding structure to cover the explosion vent;The sleeve pipe part is connected with a pressure charging pipe, and the other end of the pressure charging pipe is used to charge pressure gas.

[0012] Further, the pressure charging pipe is further provided with a pressure injection pipe, and the pressure injection pipe is provided with a sealing valve for cutting off the pipeline.

[0013] Further, it further includes a pre-charge control valve, which includes a valve housing, and the valve housing is fixedly arranged on the outer tank body, and the pre-charge control valve is provided with a first connecting port and a second connecting port on the valve housing, the first connecting port is communicated with the inside of the outer tank body, and the second connecting port is communicated with the pressure charging pipe, a pre-charge cavity is formed in the valve housing, a valve seat is formed in the pre-charge cavity close to the first connecting port, a sealing bead movably arranged in the axial direction is arranged in the pre-charge cavity, the sealing bead is tightly arranged on the valve seat to form a seal, and a jacking spring is further arranged in the pre-charge cavity, one end of the jacking spring is arranged on the second connecting port side, and the other end is tightly arranged on the sealing bead;The sealing bead is configured to always have a tendency to move close to the valve seat by the jacking spring.

[0014] Further, the elastic member comprises a cylinder structure, the cylinder structure comprises a cylinder body and a cylinder rod, the cylinder body is fixedly arranged on the cap, the cylinder rod is movably arranged in the cylinder body, and the extending end of the cylinder rod is vertically connected to the center of the cap, the cylinder body is connected with the pressure filling pipe through a balance pipe, and pressure gas enters the cylinder body through the balance pipe to make the cylinder rod always have a tendency to push the cover plate to seal the explosion-proof opening.

[0015] Further, one end of the pressure filling pipe is connected with a pressure injection pipe, the pressure filling pipe is provided with a delayed air inlet valve, the delayed air inlet valve is provided with a partition plate, and at least one micro hole is formed in the partition plate.

[0016] Further, the elastic member further comprises a reset spring, and the elastic force of the reset spring is applied to the cover plate, so that the cover plate always has a tendency to move towards the explosion-proof opening.

[0017] Further, the cross section of the pressure adjusting cavity forms a circular ring area which is not greater than the piston area in the cylinder structure.

[0018] Further, the resultant force of the thrust F1 of the pressure gas acting on the cylinder structure and the elastic force F2 of the reset spring acting on the cover plate is F3, and the thrust F4 of the pressure gas entering the pressure adjusting cavity to the cover plate is F4, so that F3=F4.

[0019] The advantages and beneficial effects of the utility model lie in:

[0020] 1. The explosion relief device for the explosion-proof opening of the low-temperature liquid tank is used for forming a surface extrusion contact sealing by using a conical surface, and compared with the linear contact sealing formed by a sealing ring in the prior art, the contact area is larger, and better sealing effect is achieved.

[0021] 2. The conical extrusion contact sealing can make the cover plate more flexible when being opened, and the danger of pressure accumulation or explosion in the interlayer space is avoided.

[0022] 3. The pressure adjusting cavity is arranged to adjust and control the opening force of the cover plate, if the explosion relief device needs to be opened and relieved at a lower pressure, relatively high pressure can be filled into the pressure adjusting cavity, and conversely, if the opening pressure needs to be increased, the pressure adjusting cavity can be vacuumized. DRAWINGS

[0023] Figure 1 is a position change schematic view of the explosion relief device in the embodiment one of the utility model;

[0024] Figure 2 is a position change schematic view of the explosion relief device in the embodiment two of the utility model;

[0025] Figure 3 is a structural schematic diagram of the pre-charge pressure control valve in the utility model;

[0026] Figure 4 is a structural schematic diagram of the explosion-proof relief device in the fifth embodiment of the utility model;

[0027] Figure 5 is a structural schematic diagram of the explosion-proof relief device in the sixth embodiment of the utility model;

[0028] Figure 6 is a structural schematic diagram of the explosion-proof relief device in the seventh embodiment of the utility model;

[0029] Figure 7 is a schematic diagram of the explosion-proof relief device in the prior art;

[0030] In the figure: 1, outer tank body; 2, explosion-proof port; 3, relief pipe; 4, cover plate; 5, bevel end; 6, conical concave slope; 7, conical convex slope; 8, boss end; 9, gasket; 10, first acting surface; 11, second acting surface; 12, sleeve part; 13, pressure regulating cavity; 14, elastic member; 15, pressure charging pipe; 16, pressure injection pipe; 17, sealing valve; 18, pre-charge pressure control valve; 19, valve housing; 20, first connecting port; 21, second connecting port; 22, pre-charge pressure cavity; 23, valve seat; 24, sealing bead; 25, pressure spring; 26, air cylinder structure; 27, air cylinder body; 28, air cylinder rod; 29, balance pipe; 30, delayed intake valve; 31, partition plate; 32, micro hole; 33, return spring; 34, cap; 35, guide structure; 36, guide rod; 37, guide bushing; 38, open end; 39, switching valve. DETAILED DESCRIPTION

[0031] The specific embodiments of the utility model are further described below in combination with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.

[0032] Embodiment one:

[0033] An explosion-proof relief device for an explosion-proof port of a low-temperature liquid tank, as shown in the figure, comprises an outer tank body 1, the outer tank body 1 is provided with an explosion-proof port 2, the explosion-proof port 2 is connected with a relief pipe 3, and the relief pipe 3 is sealingly matched with a cover plate 4. Figure 1 In actual use, the low-temperature liquid tank is also provided with an inner tank body, and a sandwiched space is formed between the outer tank body 1 and the inner tank body, the sandwiched space is vacuumized when transporting low-temperature liquid, a negative pressure is formed relative to the outside, and thus a heat insulation effect is achieved. Figure 1 As shown in the figure, the explosion-proof port 2 and the relief pipe 3 are arranged on the outer tank body 1, and are used for explosion-proof relief when the pressure in the sandwiched space abnormally rises.

[0034] In this embodiment, the end of the vent pipe 3 furthest from the outer tank 1 is a bevel end 5, and the structure of the bevel end 5 is a conical concave slope 6 with a high outer edge and a low inner edge; the bevel end 5 of the vent pipe 3 forms a concave concave surface in the center. The end of the cover plate 4 facing the explosion-proof opening 2 is a boss end 8, and the boss end 8 is a conical convex slope 7 that fits against the concave concave slope 6; as Figure 1 As shown in (B), when the cover plate 4 is placed on the vent pipe 3, a seal is achieved by the mutual contact of the concave and convex conical surfaces. Furthermore, a sealing gasket 9 is provided between the conical concave surface 6 and the conical convex surface 7. It can be understood that the sealing gasket 9 can be placed individually on the concave surface 6 or the conical convex surface 7, or simultaneously on both conical surfaces, so that the cover plate 4 forms a surface contact compression seal structure with the explosion-proof opening 2. When the cover plate 4 is attached to the vent pipe 3, because the interlayer space is under negative pressure and the outside is under atmospheric pressure, the seal is achieved under pressure. Under the action of force difference, the cover plate 4 can be firmly pressed and adhered to the vent pipe 3 to form a good seal; and the sealing contact surface is a sloping surface, which not only increases the sealing contact area, but also, due to the sloping design, creates a more reliable seal the more it is pressed; during use, if the pressure in the interlayer space rises abnormally, the increased internal pressure can directly push the cover plate 4 away from the vent pipe 3 opening. It can be understood that the effect of the conical sloping surface design in this embodiment is a good compression sealing effect and easy push-opening, compared to existing technologies such as... Figure 7 As shown, the sealing method using the interference fit of the sealing ring makes it easier to open the cover plate 4 in this embodiment, and the opening force is relatively small, so that there is no risk of pressure buildup or even explosion in the interlayer space.

[0035] The side of the cover plate 4 facing the explosion-proof opening 2 is the first working surface 10, and the side away from the explosion-proof opening 2 is the second working surface 11. The first working surface 10 is smaller than the second working surface 11.

[0036] Preferably, a guide structure 35 can be added, which is disposed inside the explosion-proof opening 2 or between the cover plate 4 and the cap 34, to guide the movement of the cover plate 4. Figure 3 As shown, a guide rod 36 is provided at the center of the first working surface 10 of the cover plate 4, and a guide sleeve 37 is provided along the axis inside the discharge pipe 3. The guide sleeve 37 is fixedly connected to the discharge pipe 3 by support rods around its perimeter. The guide rod 36 slides through the guide shaft. As another embodiment, the guide rod 36 can be set on the second working surface 11 of the cover plate 4, while the guide sleeve 37 can be set on the cap 34, which can also achieve the guiding function. It is understood that either method can be set, or both methods can be set at the same time.

[0037] Example 2:

[0038] As an improvement, a pressure balance structure is further included, which comprises a sleeve part 12 sleeved on the outer periphery of the relief pipe 3, as shown in Figure 2 Fig. (A), the sleeve part 12 is coaxially arranged with the relief pipe 3, and the root of the sleeve part 12 is sealingly fixed on the outer tank body 1, and the other end is an open end 38; when the cover plate 4 seals the explosion-proof opening 2, the open end 38 is in contact with the conical convex slope 7 to form a seal for the open end 38, as shown in Figure 2 Fig. (B), a pressure regulating cavity 13 is formed around the outer periphery of the relief pipe 3, and the pressure regulating cavity 13 is filled with pressure gas, and the thrust of the pressure gas applied to the cover plate 4 is used to offset the pressure on the second acting surface 11.

[0039] It can be understood that the pressure acting on the second acting surface is F 外 . The pressure acting on the side of the first acting surface is F 内 ,

[0040] F 外 =P0×S 外 ;

[0041] In the formula, P0 is the atmospheric pressure, and S 外 corresponds to the area of the second acting surface;

[0042] F 内 = F a +F b ;

[0043] F a =P 夹层空间 ×S 泄放管 ;

[0044] F b =P 套管部 ×S 套管部 ;

[0045] In the formula, F a is the pressure of the interlayer space acting on the side of the first acting surface of the cover plate; F b is the pressure of the sleeve part acting on the side of the first acting surface of the cover plate;

[0046] P 夹层空间 is the pressure in the interlayer space, and S 泄放管 corresponds to the cross-sectional area of the relief pipe;

[0047] P 套管部 is the pressure in the pressure regulating cavity, and S 套管部 corresponds to the cross-sectional area of the pressure regulating cavity;

[0048] In the use of the first embodiment, the opening force of the cover plate 4 is completely provided by the pressure rise in the interlayer space, and the cover plate 4 can only be lifted when the pressure in the interlayer space is greater than the atmospheric pressure. If the pressure in the interlayer space rises slowly, the cover plate 4 will not be opened in the time range during the pressure rise, which may easily cause a delay in pressure relief and a late discovery. In the present embodiment, the pressure regulating chamber 13 is improved, and the pressure gas is filled in the chamber to make the chamber have a certain pressure forming force Fb, so that the opening force of the cover plate 4 in the interlayer space can be reduced, and the cover plate 4 can be lifted to relieve pressure when a small pressure is generated in the interlayer space, so that the early discovery and early treatment of leakage can be achieved, and the risk of pressure accumulation in the interlayer space can be avoided.

[0049] In addition, it can be understood that, conversely, negative pressure operation can also be performed on the pressure regulating chamber 13, so as to increase the extrusion sealing force of the cover plate 4 on the explosion-proof port 2. Conversely, the opening force of the interlayer space on the cover plate 4 will be increased. The present embodiment can be applied to some special occasions of liquid tanks.

[0050] In summary, the present embodiment can accurately control the opening force of the interlayer space on the cover plate 4 by controlling the pressure in the pressure regulating chamber 13. When the pressure in the pressure regulating chamber 13 is relatively increased, the opening force is reduced. When the pressure in the pressure regulating chamber 13 is relatively reduced, the opening force is increased. The sleeve part 12 is connected with a pressure filling pipe 15, and the other end of the pressure filling pipe 15 is used to fill pressure gas. The pressure filling pipe 15 is also provided with a pressure injection pipe 16, and the pressure injection pipe 16 is provided with a sealing valve 17 for cutting off the pipeline. The pressure in the pressure regulating chamber 13 can be controlled by the pressure filling pipe 15, and the internal pressure can be maintained by cutting off by the sealing valve 17.

[0051] Embodiment three:

[0052] An elastic member 14 is arranged between the first action surface 10 and the cap 34, and the thrust of the elastic member 14 acts on the first action surface 10, so that the cover plate 4 is guided and sealed on the explosion-proof port 2 by the guide structure 35. In the first and second embodiments, the cover plate 4 is not convenient to automatically reset after being lifted. As an improvement of the second embodiment, the elastic member 14 is arranged in the present embodiment. When the cover plate 4 is opened and the internal pressure is insufficient to lift the cover plate 4, the cover plate 4 is pushed along the direction of the guide structure 35 to seal on the relief pipe 3 under the action of the elastic member 14. It can be understood that the elastic member 14 can be a spring.

[0053] Embodiment four:

[0054] As an improvement, the pre-charge pressure control valve 18 is further included, which comprises a valve housing 19 fixedly arranged on the outer tank body 1, the pre-charge pressure control valve 18 being provided with a first connecting port 20 and a second connecting port 21 on the valve housing 19, the first connecting port 20 being in communication with the interior of the outer tank body 1, the second connecting port 21 being in communication with the charging pipe 15, and a pre-charge pressure cavity 22 being formed in the valve housing 19. Figure 3 As shown in FIG. 3, when the cover plate 4 is opened for the first time, the pre-charged pressure gas in the pressure regulating cavity 13 is released, and when the cover plate 4 is pressed on the relief pipe 3 again by the spring, the push force of the pressure regulating cavity 13 on the cover plate 4 is reduced when the cover plate 4 is opened for the second time, i.e., the Fb force is reduced, and accordingly, the Fa needs to be increased when the cover plate 4 is opened. In this embodiment, the pre-charge pressure control valve 18 is used to supplement the opening force in advance, and specifically, a valve seat 23 is formed in the pre-charge pressure cavity 22 close to the first connecting port 20, a sealing bead 24 movably arranged in the axial direction is arranged in the pre-charge pressure cavity 22, the sealing bead 24 is tightly arranged on the valve seat 23 to form a seal, a top pressing spring 25 is further arranged in the pre-charge pressure cavity 22, one end of the top pressing spring 25 is arranged on the second connecting port 21 side, and the other end is tightly arranged on the sealing bead 24, and the sealing bead 24 is configured to always have a tendency to move close to the valve seat 23 by the top pressing spring 25. In actual use, the opening force of the sealing bead 24 is designed to be easier to open than the cover plate 4, i.e., the sealing bead 24 is opened before the cover plate 4 (a top pressing spring 25 with appropriate elasticity is used), and in use, when the interlayer space pressure rises, the pre-charge pressure control valve 18 is preferentially passed into the pressure regulating cavity 13, so that the pressure of the pressure regulating cavity 13 rises, and then the Fb also increases, thereby reducing the opening force of the interlayer space on the cover plate 4 in the process of opening the cover plate 4. It can be understood that the pressure of the interlayer space acts on the increasing area of the first acting surface 10 side in the process of opening the cover plate 4.

[0055] Embodiment five:

[0056] As an improvement, the elastic member 14 comprises a cylinder structure 26, which can be understood as also having a guiding function, as shown in FIG. 4. Figure 4As shown, the cylinder structure 26 includes a cylinder body 27 fixedly arranged on the cap 34, and a cylinder rod 28 movably arranged in the cylinder body 27, the extending end of the cylinder rod 28 being vertically connected to the center of the cap 34. The cylinder body 27 is connected to the pressure charging pipe 15 through the balance pipe 29, and the pressure gas enters the cylinder body 27 through the balance pipe 29, so that the cylinder rod 28 always has a tendency to push the cover plate 4 to seal the explosion-proof opening 2. Specifically, one end of the pressure charging pipe 15 is connected with the pressure injection pipe 16. In this embodiment, the pressure gas is filled into the pressure charging pipe 15 and the balance pipe 29 through the pressure injection pipe 16, so that the cylinder structure 26 can press the cover plate 4 to seal the opening of the relief pipe 3. It should be noted that when the pressure is charged, the gas enters the pressure regulating cavity 13 through the pressure charging pipe 15, and at this time, the opening end 38 is open, so the pressure is completely leaked and cannot push the cylinder to act. Therefore, the delay air inlet valve 30 is arranged on the pressure charging pipe 15, the delay air inlet valve 30 is provided with the partition plate 31, and at least one micro-hole 32 is arranged through the partition plate 31. At this time, when the pressure is charged, the gas is blocked by the partition plate 31 (because the micro-hole 32 is arranged, the gas leakage amount of the partition plate 31 is small), and the gas is preferentially filled into the cylinder structure 26, so that the cover plate 4 is pressed down to seal the opening end 38. When the cylinder structure 26 is actuated, the gas rises the pressure in the pressure regulating cavity 13 to be the same as the pressure in the cylinder structure 26 through the micro-hole 32. The effect of this embodiment is that after the air is ventilated, the cover plate 4 can be automatically closed, and then the pressure balance of the two sides can offset the force, so as to reduce the opening force of the cover plate 4 on the interlayer space. When the Fb acting force rises and ends, the pressure in the pressure regulating cavity 13 is the same as the pressure in the cylinder body 27, so that the acting force of the cylinder body 27 on the cover plate 4 and the acting force of the pressure regulating cavity 13 on the second acting surface 11 side can be offset. The final result of mutual offsetting has three kinds, which depends on the ratio of the area of the cylinder piston to the cross-sectional area of the pressure regulating cavity 13. One, the area of the cylinder side piston is greater than the cross-sectional area of the pressure regulating cavity 13, the acting force of the cylinder body 27 is greater; two, the area of the cylinder side piston is equal to the cross-sectional area of the pressure regulating cavity 13, the acting forces of the two sides are equal and offset; three, the area of the cylinder side piston is smaller than the cross-sectional area of the pressure regulating cavity 13, the acting force of the pressure regulating cavity 13 side is greater; in actual use, it can be appropriately selected according to the customer's demand. The cross-sectional area of the pressure regulating cavity 13 is not greater than the piston area in the cylinder structure 26, so that the acting force of the pressure regulating cavity 13 side is smaller than the acting force of the cylinder.

[0057] Embodiment six:

[0058] Furthermore, as an improvement to Embodiment 5, the elastic element 14 also includes a return spring 33, the elastic force of which is applied to the cover plate 4, causing the cover plate 4 to be configured to always tend to move towards the explosion-proof opening 2. In Embodiment 5, after the cover plate 4 is opened, it is not easy for the cover plate 4 to automatically return to its original position without pressurization via the sealing valve 17. Figure 5 As shown, a reset spring 33 is added in this embodiment, which pushes the cover plate 4 back under its action to achieve a preliminary seal;

[0059] Specifically, after pressurization via sealing valve 17, the combined force of the thrust F1 generated by the pressurized gas acting on cylinder structure 26 and the elastic force F2 generated by the return spring 33 acting on cover plate 4 is F3. The thrust F4 generated by the pressurized gas entering pressure regulating chamber 13 on cover plate 4 is F4, making F3=F4. At this time, the thrust when the interlayer space initially opens cover plate 4 is at a low level, unaffected by the combined force of cylinder and return spring 33, causing cover plate 4 to be in a suspended state. The sealing of cover plate 4 is only affected by the pressure difference between the inside and outside of outer tank 1. If F3=F4, the cross-sectional area of ​​pressure regulating chamber 13 is larger than the area of ​​cylinder piston, and the excess area offsets the elastic force of return spring 33.

[0060] Example 7:

[0061] In Example 6, when the cover plate 4 is opened, the pressure inside the balance pipe 29 is released, and the cylinder cannot push the cover plate 4 to reset. Its advantage is that it can release the pressure in the interlayer space at once, and then manually reset it. The disadvantage is that, for some application scenarios where the interlayer space has a certain internal pressure, the inability to automatically reset after pressure release affects the maintenance of pressure within the interlayer space. As an improvement, such as... Figure 6 As shown, based on Embodiment 5 and combined with the pre-pressurization control valve 18 pipeline design in Embodiment 4, a switching valve 39 is installed between the upper end of the pre-pressurization control valve 18 and the pressure injection pipe 16. The actual operation is as follows: before pressurization via the sealing valve 17, the switching valve 39 is closed, causing the cover plate 4 to close. Pressure enters the pressure regulating chamber 13 from the delayed air intake valve 30 and then flows back into the pre-pressurization control valve 18. After pressurization is complete, the sealing valve 17 is closed, and the switching valve 39 is opened. The resulting control effect is that after the interlayer space pressure increases and the cover plate 4 is opened to release pressure, the delayed air intake valve... The slow pressure release of the micro-hole 32 within the cylinder, coupled with the pressure of the return spring 33, limits the opening speed of the cover plate 4. By connecting the pre-pressurization control valve 18 pipeline, the pressure inside the cylinder can be quickly released through this pipeline, thereby accelerating the opening of the cover plate 4. When the pressure inside the interlayer space decreases, the pressure of the return spring 33 closes the cover plate 4, thus achieving a faster opening of the cover plate 4 and making the pressure control of the interlayer space more precise. After the return spring 33 automatically resets, the pressure in the pressure regulating chamber 13 decreases. At this time, the pre-pressurization control valve 18 is automatically controlled according to the control method of Embodiment 4.

[0062] The above merely describes preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as falling within the protection scope of the present application.

Claims

1. A kind of anti-explosion relief device for low-temperature liquid tank box tank body explosion vent, including outer tank body (1), outer tank body (1) is equipped with explosion vent (2), explosion vent (2) is connected with the relief pipe (3) equipped, with cover plate (4) being sealed with relief pipe (3), it is characterized in that, The slope end (5) of the said relief pipe (3) is away from the outer tank body (1), the structure of the slope end (5) is the conical concave slope (6) with the outer edge high and the inner edge low of the relief pipe (3); the boss end (8) of the cover plate (4) is toward the explosion-proof port (2), the boss end (8) is the conical convex slope (7) which is fitted with the conical concave slope (6); the sealing gasket (9) is arranged between the conical concave slope (6) and the conical convex slope (7), so that the cover plate (4) forms the extrusion sealing structure of the surface contact to the explosion-proof port (2); The first action surface (10) of the cover plate (4) is toward the explosion-proof port (2), the second action surface (11) is away from the explosion-proof port (2), the first action surface (10) is smaller than the second action surface (11); The guide structure (35) is arranged in the explosion-proof port (2) or between the cover plate (4) and the cap (34), and is used for guiding the movement of the cover plate (4).

2. A pressure relief device for a burst disc (2) of a cryogenic liquid tank, according to claim 1, characterized in that, The pressure balance structure further comprises the sleeve pipe part (12) which is sleeved on the outer periphery of the relief pipe (3), the sleeve pipe part (12) is coaxially arranged with the relief pipe (3), the root of the sleeve pipe part (12) is sealingly and fixedly arranged on the outer tank body (1), and the other end is the open end (38), when the cover plate (4) seals the explosion-proof port (2), the open end (38) is fitted with the conical convex slope (7) to form the sealing of the open end (38), and the pressure regulating cavity (13) which surrounds the outer periphery of the relief pipe (3) is formed, the pressure gas is filled in the pressure regulating cavity (13), and the thrust of the pressure gas applied to the cover plate (4) is used for offsetting the pressure on the second action surface (11).

3. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 2, characterized in that, The elastic member (14) is arranged between the first action surface (10) and the cap (34), the thrust of the elastic member (14) acts on the first action surface (10), so that the cover plate (4) is guided and sealed to the explosion-proof port (2) by the guide structure (35); the pressure filling pipe (15) is connected to the sleeve pipe part (12), and the other end of the pressure filling pipe (15) is used for filling the pressure gas.

4. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 3, characterized in that, The pressure injection pipe (16) is further arranged on the pressure filling pipe (15), and the sealing valve (17) for cutting off the pipeline is arranged on the pressure injection pipe (16).

5. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 3 or 4, characterized in that The pre-charge pressure control valve (18) is provided with a first connecting port (20) and a second connecting port (21) on the valve housing (19), the first connecting port (20) is communicated with the inside of the outer tank body (1), and the second connecting port (21) is communicated with the charging pipe (15), a pre-charge pressure cavity (22) is formed in the valve housing (19), a valve seat (23) is formed in the pre-charge pressure cavity (22) near the first connecting port (20), a sealing bead (24) movably arranged in the axial direction is arranged in the pre-charge pressure cavity (22), the sealing bead (24) is tightly arranged on the valve seat (23) to form a seal, and a top pressing spring (25) is further arranged in the pre-charge pressure cavity (22), one end of the top pressing spring (25) is arranged on the side of the second connecting port (21), and the other end is tightly arranged on the sealing bead (24); the sealing bead (24) is always pushed by the top pressing spring (25) to have a tendency to move close to the valve seat (23).

6. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 3, characterized in that, The elastic member (14) comprises a cylinder structure (26), the cylinder structure (26) comprises a cylinder body (27) and a cylinder rod (28), the cylinder body (27) is fixedly arranged on the cap (34), the cylinder rod (28) is movably arranged in the cylinder body (27), and the extending end of the cylinder rod (28) is perpendicularly connected to the center of the cap (34); the cylinder body (27) and the charging pipe (15) are connected and communicated through a balance pipe (29), and the pressure gas enters the cylinder body (27) through the balance pipe (29) to make the cylinder rod (28) always have a tendency to push the cover plate (4) to seal the explosion-proof port (2).

7. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 6, characterized in that, One end of the charging pipe (15) is connected with a pressure injection pipe (16), the charging pipe (15) is provided with a delay air inlet valve (30), the delay air inlet valve (30) is provided with a partition plate (31), and at least one micro hole (32) is arranged in the partition plate (31).

8. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 7, characterized in that, The elastic member (14) further comprises a reset spring (33), and the elastic force of the reset spring (33) is applied to the cover plate (4), so that the cover plate (4) always has a tendency to move towards the explosion-proof port (2).

9. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 6, characterized in that, The cross section of the pressure regulating cavity (13) forms a circular ring area, and the area is not greater than the piston area in the cylinder structure (26).

10. A pressure relief device for a pressure relief vent (2) of a cryogenic liquid tank, according to claim 8, characterized in that, The thrust F1 of the pressure gas acting on the cylinder structure (26) and the elastic force F2 of the reset spring (33) acting on the cover plate (4) form a resultant force F3, and the thrust of the pressure gas entering the pressure regulating cavity (13) to the cover plate (4) is F4, so that F3=F4.

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