CN211010765U - Crisscross labyrinth supports on-vehicle low temperature heat insulation gas cylinder of tubular - Google Patents

Abstract

A staggered labyrinth support tube type vehicle-mounted low-temperature heat-insulating gas cylinder belongs to the field of mobile low-temperature heat-insulating pressure vessels. The main structural features of this vehicle-mounted low-temperature thermal insulation gas cylinder lie in its front support structure and rear support structure. On the premise of not changing the structure of the gas cylinder, the inner and outer tubes supported by the front and rear are designed as a labyrinth-type circular tube structure with internal and external staggering, which can effectively lengthen the heat conduction path while ensuring the strength of the supporting structure. The tube can greatly reduce the heat leakage. In order to eliminate the thermal stress caused by thermal expansion and contraction, the front and rear support structures are fixed at the front and slide at the rear. Among them, the front-end support and fixation can facilitate the effective connection of the gas cylinder with the outer inlet and outlet nozzles; the rear-end adopts the support tube sliding structure, which overcomes the problems of small diameter and large radial shaking of the rear support cylinder of conventional gas cylinders. The utility model also has the advantages of less welding spots, simple structure and easy guarantee of strength, etc. The structure can be used for storing other similar low-temperature liquefied gas.

Description

A kind of staggered labyrinth support tube type vehicle-mounted cryogenic thermal insulation gas cylinder

technical field

The utility model relates to a staggered labyrinth supporting tube type vehicle-mounted low-temperature heat-insulating gas cylinder, which belongs to the field of mobile low-temperature pressure vessels, in particular to the rapidly developing low-temperature heat-insulating gas cylinder.

Background technique

Mobile pressure vessels such as gas cylinders are mainly used for the storage and transportation of industrial raw materials and civil fuels. They are important basic equipment for the development of the national economy and important infrastructure for people's lives. According to statistics, the annual output of mobile pressure vessels such as gas cylinders in my country is 30 million units (units), and the current consumption is nearly 140 million units (units), ranking first in the world. burst characteristics. Therefore, in recent years, the country has paid special attention to the research on related technologies of mobile pressure vessels such as gas cylinders.

With the depletion of traditional energy oil and coal, coupled with the greenhouse effect and acid rain produced by the combustion products of oil and coal, human beings are faced with severe challenges of energy, resource and environmental crises, and human beings are increasingly in need of clean new energy. Hydrogen energy has aroused widespread interest due to its renewable advantages and abundant resources, and hydrogen does not cause environmental pollution, so it is a very ideal and clean energy source. In order to reduce carbon dioxide emissions from vehicles, the development of hydrogen-fueled vehicles using hydrogen as fuel is prevalent, and research on cryogenic liquid hydrogen cylinders has also continued to develop. Compared with the traditional vehicle-mounted low-temperature insulating gas cylinder, the liquid hydrogen has a very low medium temperature (the design temperature is -253 °C), and the heat leakage under the same conditions is much higher than that of the traditional gas cylinder, so the low-temperature insulation of the liquid hydrogen medium is low. In the research on the structural design of the hot gas cylinder, it is necessary to pay attention to reducing the overall thermal conductivity of the gas cylinder to improve the thermal insulation performance.

The support tube of the low-temperature insulating gas cylinder is the key to the design of the heat leakage structure of the gas cylinder. It should not only have sufficient strength to withstand various loads during vehicle loading, but also reduce heat leakage as much as possible. In the traditional support tube structure, under the premise of ensuring the strength, the wall thickness is too large and the heat transfer loss is too high. Studies have shown that the heat flow ratio of the support structure is as high as 30-50%, which cannot meet the needs of vehicle-mounted liquid hydrogen cylinders. On the contrary, if the heat loss is reduced by reducing the wall thickness, the requirements of support strength and machining cannot be satisfied. Therefore, it is necessary to develop a vehicle-mounted low-temperature thermal insulation gas cylinder with reliable structure, small heat transfer and convenient processing.

SUMMARY OF THE INVENTION

The utility model provides a staggered labyrinth supporting tube type vehicle-mounted low-temperature heat-insulating gas cylinder. On the premise of not changing the complexity of the gas cylinder structure, the inner and outer tubes supported at the front and rear are designed as a labyrinth-type circular tube structure with staggered inside and outside. The structure can effectively lengthen the heat conduction path while ensuring the strength of the support structure, which can greatly reduce the heat leakage compared with the traditional round tube, and ensure the long-term stable operation of the gas cylinder.

The technical scheme adopted by the utility model is as follows: a staggered labyrinth support tube type vehicle-mounted low-temperature thermal insulation gas cylinder, which comprises an inner tank, an outer shell, an end pipeline and a supporting structure, and the outer shell is provided with a thermal insulation layer wrapping the inner tank, The end pipeline includes a liquid inlet pipe, a booster pipe, a liquid outlet pipe and a gas return pipe that pass through the shell and enter the inner bladder, and the support structure adopts a horizontal support or a vertical support; the horizontal support includes a front support The structure and the rear support structure are in the form of the front support structure being fixed and the rear support structure sliding. Staggered labyrinth front support outer tube and front support connection cover, one end of the front welding flange is fixedly connected with the front head of the shell, and the other end is welded with the staggered labyrinth front support inner tube, and the staggered labyrinth front support inner tube passes through the end The front support connection cover is connected with one end of the staggered labyrinth front support outer tube, the other end of the staggered labyrinth front support outer tube is welded with the front head of the inner tank, and the front support structure is isolated from the external environment through the front spacer. Open; the rear support structure includes the shell rear head, the inner tank rear head, the rear sliding sleeve flange, the staggered labyrinth type rear support inner pipe, the staggered labyrinth type rear support outer pipe and the rear support connection cover, the rear sliding sleeve method One end of the blue is fixedly connected with the rear head of the shell, and the inner wall of the sliding sleeve at the other end is in sliding fit with the outer wall of the staggered labyrinth rear support inner tube. One end of the staggered labyrinth type rear support outer tube is welded together with the rear head of the inner tank, and the rear support structure is separated from the external environment by the rear spacer.

The staggered labyrinth front support inner tube, staggered labyrinth front support outer tube, staggered labyrinth rear support inner tube and staggered labyrinth rear support outer tube are designed into different inner and outer staggered staggered labyrinth structures according to the heat leakage rate. The inner tube and outer tube of the square zigzag labyrinth structure have a wall thickness of 3-30 mm, and the axial length of each square serration is 1-10 mm, forming a staggered structure inside and out.

The staggered labyrinth front support inner tube, the staggered labyrinth front support outer tube, the staggered labyrinth rear support inner tube and the staggered labyrinth rear support outer tube adopt a trapezoidal, circular, triangular or spiral labyrinth structure.

The insulating gas cylinder is used for storing LNG, liquid nitrogen, liquid oxygen or liquid hydrogen.

The vertical support only adopts the front support structure, and the insulating gas cylinder is vertically placed and fixed.

The beneficial effects of the utility model are as follows: a staggered labyrinth support tube type vehicle-mounted low-temperature thermal insulation gas cylinder, the horizontal support structure includes a front support structure and a rear support structure. In order to eliminate the thermal stress caused by thermal expansion and contraction, the front and rear support structures The front end is fixed and the rear end is sliding. Among them, the front support is fixed to facilitate the effective connection between the gas cylinder and the outer inlet and outlet nozzles; the rear support sliding selects the support tube sliding structure, which overcomes the small diameter of the rear support cylinder, large radial shaking and connection with the outer shell of the conventional cryogenic bottle. The accuracy of the support structure is difficult to guarantee and so on. Different from the traditional straight round tube, the front support inner tube and the rear support inner tube in the present invention are designed to be a labyrinth structure or other similar zigzag structures. The structure extends the heat conduction path, which can reduce the heat leakage by more than 1/3. Moreover, this neck tube style can be realized by machining methods, and has the advantages of fewer solder joints, fewer defects and easy assurance of strength. The gas cylinder of the utility model can not only be used to store liquefied hydrogen, but also can be used to store other low-temperature liquefied gases such as LNG, liquid nitrogen, and liquid oxygen, and the scope of use is not limited by the medium. If the rear support part of the gas cylinder is removed, including the rear support connection cover, the staggered labyrinth rear support outer tube, the staggered labyrinth rear support inner tube, the rear sliding sleeve flange and the rear spacer, it can be placed vertically and can also be changed into Vertical cryogenic insulated cylinders.

Description of drawings

Figure 1 is a structural diagram of a staggered labyrinth support tube type vehicle-mounted cryogenic thermal insulation gas cylinder.

FIG. 2 is an orientation view of the nozzle of the pipe at the end of the insulated gas cylinder in FIG. 1 .

FIG. 3 is an enlarged view of A in FIG. 1 .

FIG. 4 is an enlarged view of B in FIG. 1 .

FIG. 5 is an enlarged view of C in FIG. 3 .

In the figure: 1. The front cover of the shell, 2. The front welding flange, 3. The staggered labyrinth front support inner tube, 4. The inner tank front head, 5. The staggered labyrinth front support outer tube, 6. The front support connection Cover, 7. Front spacer, 8. Rear support connection cover, 9. Staggered labyrinth rear support outer tube, 10. Staggered labyrinth rear support inner tube, 11. Rear head of inner tank, 12. Rear sliding sleeve flange , 13, the back cover of the shell, 14, the rear spacer, 15, the thermal insulation layer, 16, the liquid inlet pipe, 17, the booster pipe, 18, the liquid outlet pipe, 19, the gas return pipe.

Detailed ways

The device will be described in detail below with reference to the accompanying drawings.

Figure 1 shows a structural diagram of a staggered labyrinth support tube type vehicle-mounted cryogenic thermal insulation gas cylinder. The heat insulating gas bottle includes an inner bladder, an outer casing, an end pipe, a heat insulating layer 15 , a front support structure arranged in the front spacer 7 and a rear support structure arranged in the rear spacer 14 .

FIG. 2 is an orientation view of the nozzle of the pipe at the end of the insulated gas cylinder in FIG. 1 . The liquid inlet pipe 16 , the booster pipe 17 , the liquid outlet pipe 18 and the air return pipe 19 all pass through the front cover 1 of the outer shell and the front cover 4 of the inner tank and enter the inner tank.

Figure 3 shows a structural diagram of the front support assembly (enlarged view of A in Figure 1). The front support assembly includes a shell front head 1 , an inner tank front head 4 , a front welding flange 2 , a staggered labyrinth front support inner pipe 3 , a staggered labyrinth front support outer pipe 5 and a front support connection cover 6 . One end of the front welding flange 2 and the front head 1 of the shell are fixedly connected by welding, and the other end is welded with the staggered labyrinth front support inner tube 3. The staggered labyrinth front support inner tube 3 is connected to the front support connection cover 6 at the end. The staggered labyrinth type front support outer tube 5 is fixedly connected, and the other end of the staggered labyrinth type front support outer tube 5 is welded together with the inner tank front head 4 .

FIG. 4 shows a structural diagram of the rear support assembly (enlarged view of B in FIG. 1 ). The rear support structure includes the shell rear head 13, the inner tank rear head 11, the rear sliding sleeve flange 12, the staggered labyrinth rear support inner tube 10, the staggered labyrinth rear support outer tube 9 and the rear support connection cover 8. One end of the sleeve flange 12 is fixedly connected with the rear head 13 of the outer casing, and the inner wall of the sliding sleeve at the other end forms a sliding fit with the outer wall of the staggered labyrinth rear support inner tube 10, and the staggered labyrinth rear support inner tube 10 is connected to the rear support connection cover 8 with the staggered labyrinth rear support inner tube 10. One end of the staggered labyrinth type rear support outer tube 9 is connected together, and the other end of the staggered labyrinth type rear support outer tube 9 is welded together with the rear sealing head 11 of the inner bladder.

Figure 5 shows a detailed structural diagram of the staggered labyrinth support (enlarged view of C in Figure 4). The neck tube is integrally processed into this internal and external staggered form, and the specific dimensions of the staggered labyrinth support tube and the chamfer in the figure can be changed according to the different requirements of the gas cylinder on the neck tube strength and heat leakage.

By adopting the above technical solution, the supporting structure of the vehicle-mounted low-temperature heat-insulating gas cylinder retains sufficient supporting strength and can withstand various loads generated during vehicle-mounted. The support structure adopts the support form of fixed front part and sliding rear part, which effectively reduces the thermal stress inside the gas cylinder and improves the service life of the gas cylinder. The inner and outer tubes supported by the front and rear are designed as a labyrinth-type circular tube structure with inside and outside staggered. Compared with the traditional round tube, the heat conduction path is greatly increased, the heat leakage is reduced, and the purpose of low temperature heat insulation is achieved. Similarly, when the medium or application of the vehicle-mounted low-temperature thermal insulation gas cylinder changes, the inner and outer tubes supported by the front and rear can also adopt staggered zigzag structures of different shapes such as trapezoids, circles, and triangles. The labyrinth structure is the same, and the same technical effect can be achieved in the end.

The gas cylinder of the utility model can not only be used to store liquefied hydrogen, but also can be used to store other low-temperature liquefied gases such as LNG, liquid nitrogen, and liquid oxygen, and the scope of use is not limited by the medium. On the basis of the above scheme, if the rear support part of the gas cylinder is removed, it includes the rear support connection cover 8, the staggered labyrinth rear support outer tube 9, the staggered labyrinth rear support inner tube 10, the rear sliding sleeve flange 12 and the rear The spacer 14 is placed vertically, and this solution becomes a vertical low-temperature adiabatic gas cylinder.

Claims (5)

1. A staggered labyrinth support tube type vehicle-mounted low-temperature thermal insulation gas cylinder, which comprises an inner bladder, an outer casing, an end pipeline and a support structure, and is characterized in that: the outer casing is provided with an insulating layer (15) wrapping the inner bladder, The end pipeline includes a liquid inlet pipe (16), a booster pipe (17), a liquid outlet pipe (18) and a gas return pipe (19) that pass through the shell and enter the inner bladder, and the supporting structure adopts a horizontal support or a Vertical support; the horizontal support includes a front support structure and a rear support structure, and adopts the form of fixing the front support structure and sliding the rear support structure, and the front support structure includes a front cover of the shell (1), a front seal of the inner tank Head (4), front welding flange (2), staggered labyrinth front support inner tube (3), staggered labyrinth front support outer tube (5) and front support connection cover (6), front welding flange (2) One end is fixedly connected with the front cover (1) of the shell, and the other end is welded with the staggered labyrinth front support inner tube (3). The staggered labyrinth front support inner tube (3) is connected to the cover (6) through the front support at the end It is connected with one end of the staggered labyrinth front support outer tube (5), and the other end of the staggered labyrinth front support outer tube (5) is welded with the inner tank front head (4), and the front support structure passes through the front spacer. (7) It is separated from the external environment; the rear support structure includes a rear cover head (13) of the outer casing, a rear cover head (11) of the inner tank, a rear sliding sleeve flange (12), and a staggered labyrinth rear support inner pipe (10). ), the staggered labyrinth type rear support outer tube (9) and the rear support connection cover (8), one end of the rear sliding sleeve flange (12) is fixedly connected to the rear head (13) of the shell, and the inner wall of the sliding sleeve at the other end is connected to the staggered labyrinth The outer walls of the staggered labyrinth rear support inner tube (10) are in sliding fit. The other end of the labyrinth-type rear support outer tube (9) is welded with the inner tank rear head (11), and the rear support structure is separated from the external environment by the rear spacer (14). 2. A staggered labyrinth support tube type vehicle-mounted low temperature thermal insulation gas cylinder according to claim 1, characterized in that: the staggered labyrinth front support inner tube (3), the staggered labyrinth front support outer tube (5), The staggered labyrinth rear support inner tube (10) and the staggered labyrinth rear support outer tube (9) are designed into different inner and outer staggered labyrinth structures according to the heat leakage rate. For the inner tube and the outer tube of the square zigzag labyrinth structure, The thickness of the tube wall is 3-30 mm, and the axial length of each square sawtooth is 1-10 mm, forming a staggered structure inside and out. 3. A staggered labyrinth support tube type vehicle-mounted low temperature thermal insulation gas cylinder according to claim 1, characterized in that: the staggered labyrinth front support inner tube (3), the staggered labyrinth front support outer tube (5), The staggered labyrinth rear support inner tube (10) and the staggered labyrinth rear support outer tube (9) adopt a trapezoidal, circular, triangular or spiral-shaped labyrinth structure. 4 . The staggered labyrinth support tube type vehicle-mounted cryogenic thermal insulation gas cylinder according to claim 1 , wherein the thermal insulation gas cylinder is used for storing LNG, liquid nitrogen, liquid oxygen or liquid hydrogen. 5 . 5 . The staggered labyrinth support tube type vehicle-mounted low-temperature thermal insulation gas cylinder according to claim 1 , wherein the vertical support only adopts a front support structure, and the thermal insulation gas cylinder is vertically placed and fixed. 6 .

Images