A high-efficiency heat insulation support structure for a tank body of a low-temperature liquid tank container

Abstract

This utility model discloses a high-efficiency thermal insulation support structure for a cryogenic liquid tank, comprising a double-layer tank structure formed by an inner container and an outer container. Several support structures are provided between the inner and outer containers. Each support structure includes a positioning groove, a main support, and a thermal insulation structure. The positioning groove is fixedly mounted on the outer container. One end of the main support is connected to the outer surface of the inner container, and the other end is inserted into the groove of the positioning groove. The main support is a hollow cylindrical structure. The thermal insulation structure includes an inner thermal insulation portion located within the hollow portion of the main support and an outer thermal insulation portion located on the outer periphery of the main support. Temperature measurements of this high-efficiency thermal insulation support structure showed that the external temperature of the positioning groove at the eight support points was close to room temperature, and no frost was observed on the exterior of these eight support points after the inner container was filled with liquid. No cracks were found in the welds connecting the eight support points, thus meeting the structural strength requirements while reducing heat conduction and achieving an ideal thermal insulation effect.

Description

Technical Field

[0001] This utility model relates to the field of thermal insulation technology, specifically to a high-efficiency thermal insulation support structure for cryogenic liquid tank bodies. Background Technology

[0002] In the field of cryogenic liquid storage and transportation, cryogenic liquid tank trucks play a crucial role. These tank trucks typically employ a double-layered structure with inner and outer containers to achieve excellent insulation and reduce heat exchange between the cryogenic liquid and the external environment. The supporting connection structure between the inner and outer containers is essential for ensuring the stability and safety of the tank.

[0003] Currently, common cryogenic liquid tank trucks often employ support structures such as crossbars or support legs between the inner and outer containers. During installation, this structure requires machining numerous crossbar mounting holes on the inner tank. The weld between the inner tank and this support structure is discontinuous and lacks temperature compensation, resulting in peak stress. During repeated loading and unloading, the inner tank expands and contracts due to temperature changes, making this location prone to fatigue cracks, which can lead to tank failure in severe cases.

[0004] In existing technologies, heat leakage is a common problem at tank supports. This is mainly due to inadequate support structure design, such as poor insulation performance of the support materials or a shape and layout that fails to effectively reduce heat conduction paths. Heat leakage leads to decreased tank insulation performance and increased evaporation rate, resulting in waste of cryogenic liquids and increased gas emissions. Improper handling may even pose safety hazards. Furthermore, due to the complex stresses at the supports, existing support structures are prone to weld cracking under these conditions, further affecting the safe and stable operation of the tank. Therefore, there is an urgent need to develop a new insulated support structure to address the numerous drawbacks of existing technologies, including problems at the connection between the support structure and the tank, severe heat leakage at the supports, and easy cracking of welds. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects in the existing technology and provide a high-efficiency thermal insulation support structure for cryogenic liquid tank bodies.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A high-efficiency thermal insulation support structure for a cryogenic liquid tank includes a double-layer tank structure formed by an inner container and an outer container. Several support structures are provided between the inner and outer containers, and the support structures maintain a thermal insulation gap between the inner and outer containers. The support structure includes a positioning groove, a main support, and a thermal insulation structure. The positioning groove is fixedly installed on the outer container. One end of the main support is connected to the outer surface of the inner container, and the other end is inserted into the groove of the positioning groove. The main support is a hollow cylindrical structure. The thermal insulation structure includes an inner thermal insulation part disposed in the hollow part of the main support and an outer thermal insulation part disposed on the outer periphery of the main support.

[0008] Furthermore, the inner heat insulation portion includes a first heat insulation fiber layer, a first heat insulation blanket layer, and a second heat insulation fiber layer sequentially stacked on the outer surface of the inner container.

[0009] Furthermore, the outer heat insulation portion includes a second heat insulation layer and a third heat insulation fiber layer sequentially stacked on the outer surface of the inner container.

[0010] Furthermore, the first insulation layer and the second insulation layer are composed of several layers of aluminum foil and insulation paper stacked together.

[0011] Furthermore, the first, second, and third heat-insulating fiber layers are selected from any one of glass fiber cotton, ceramic fiber, rock wool, and aerogel heat-insulating fiber.

[0012] Furthermore, the first heat-insulating fiber layer, the first heat-insulating blanket layer, and the second heat-insulating fiber layer are all processed into circular pads, such that the diameter of the first heat-insulating fiber layer, the first heat-insulating blanket layer, and the second heat-insulating fiber layer is 3 to 8% larger than the inner diameter of the main support, so that the first heat-insulating fiber layer, the first heat-insulating blanket layer, and the second heat-insulating fiber layer are fixed in the main support by an interference fit.

[0013] Furthermore, the first and second insulation layers are provided with 50 layers, including 25 layers of aluminum foil and 25 layers of insulation paper, so that the aluminum foil and insulation paper layers are stacked alternately in one step.

[0014] Furthermore, it also includes a nano-aerogel felt layer, which is placed between the heat insulation fiber layer and the heat insulation blanket layer, and the thickness of the nano-aerogel felt layer is 5-10mm.

[0015] Furthermore, multiple support structures are used to form support groups, and multiple support groups are arranged along the axial direction of the cryogenic liquid tank. The support structures in each support group are arranged circumferentially around the cryogenic liquid tank.

[0016] The advantages and beneficial effects of this utility model are as follows: 1. Temperature measurement of the high-efficiency heat insulation support structure of this utility model shows that the external temperature of the positioning groove at the eight-point support is close to the room temperature, and no frost was found on the outside of the eight-point support after the inner container was filled with liquid. No cracking was found in the connecting weld at the eight-point support, which not only meets the strength requirements of the structure, but also reduces heat conduction and achieves the ideal heat insulation effect.

[0017] 2. By setting up a support structure between the inner and outer containers, including an inner insulation part and an outer insulation part, and using a combination of various insulation materials such as insulation fiber, insulation blanket, and nano aerogel felt, heat transfer is effectively reduced, the heat preservation performance of the tank is significantly improved, and the evaporation loss of low temperature liquid is reduced.

[0018] 3. Multiple support structures form a support group. Multiple support groups are set along the axial direction of the tank, and each support structure is arranged around the circumference. This not only ensures that the tank is subjected to uniform force in all directions, but also enhances the overall heat insulation performance and structural stability. Attached Figure Description

[0019] Figure 1 This is a longitudinal cross-sectional schematic diagram of a cryogenic liquid tank body according to this utility model;

[0020] Figure 2 This is a partially enlarged view of the high-efficiency heat insulation support structure in this utility model;

[0021] Figure 3 This is a structural diagram of the positioning groove and the main support in this utility model;

[0022] Figure 4 This is a structural diagram of the reinforcing pad in this utility model;

[0023] In the figure: 1. Inner container; 2. Outer container; 3. Support structure; 4. Insulation gap; 5. Positioning groove; 6. Main support; 7. Inner insulation part; 8. Outer insulation part; 9. First insulation fiber layer; 10. First insulation blanket layer; 11. Second insulation fiber layer; 12. Second insulation blanket layer; 13. Third insulation fiber layer; 14. Nano-aerogel felt layer; 15. First reinforcing pad; 16. Second reinforcing pad. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0025] A high-efficiency thermal insulation support structure for cryogenic liquid tank bodies, such as Figure 1-4As shown, the double-layer tank structure includes an inner container 1 and an outer container 2. Several support structures 3 are provided between the inner and outer containers 2. The support structures 3 maintain a heat insulation gap 4 between the inner container 1 and the outer container 2. In actual use, the double-layer tank has a good heat insulation effect, but the inner container 1 needs to maintain its position relative to the outer container 2, which must be maintained by the support structures 3.

[0026] Specifically, in actual use, multiple support structures 3 form support groups, with multiple support groups arranged along the axial direction of the cryogenic liquid tank. The support structures 3 in each support group are arranged circumferentially around the cryogenic liquid tank. This embodiment uses an eight-point support structure 3 as an example. The cryogenic liquid tanker tank body is composed of a double-layer structure of inner and outer containers 2. The inner and outer containers 2 are supported and connected by an eight-point support structure 3. The eight-point support consists of two sets of radial supports installed within the interlayer formed by the inner container 1 and the outer shell. Each set has four support points: two at the top and two at the bottom, distributed at a certain angle along the circumference. The rear end is a fixed end to prevent the inner container 1 of the tanker from shifting or rotating during transportation or when the inner container 1 is filled with cryogenic liquid and experiences thermal expansion and contraction. The front end is a sliding end, allowing free sliding. Heat leakage occurs at the eight-point support, leading to a decrease in the tank's insulation performance, an increase in the tank's evaporation rate, and increased gas emissions. The stress at the eight-point support is complex, and weld cracks are prone to occur at these stress points.

[0027] Therefore, this embodiment strengthens the heat leakage problem at the necessary support structure 3 to avoid increasing the evaporation rate of the tank.

[0028] Specifically, the support structure 3 includes a positioning groove 5, a main support 6, and a heat insulation structure. The positioning groove 5 is fixedly installed on the outer container 2. One end of the main support 6 is connected to the outer surface of the inner container 1, and the other end is inserted into the groove of the positioning groove 5. The positioning groove 5 is made of forging to form a groove opening. The groove opening does not need to be made by splicing. It is made of an integral forging, which increases the support strength and reduces welding leaks.

[0029] Because the positioning groove 5 requires opening and welding at its connection with the outer shell, and the positioning groove 5 experiences significant stress during operation, a first reinforcing pad 15 and a second reinforcing pad 16 are designed to increase the area of ​​the opening for reinforcement and ensure the strength of the weld, considering the weakness of the weld. The main support 6 is a hollow cylindrical structure, and the heat insulation structure includes an inner heat insulation part 7 disposed within the hollow part of the main support 6 and an outer heat insulation part 8 disposed on the outer periphery of the main support 6. The main support 6 is used to connect the inner and outer containers 2. The main support 6 is made of a material with low-temperature resistance and high strength, so it is the preferred material. To reduce heat conduction, the main support 6 is designed as a cylindrical ring. While meeting the support strength requirements, the middle of the main support 6 is designed to be hollow with an inner diameter of Φ170mm to reduce the contact area of ​​the main support 6 and reduce heat conduction. The hollow part of the main support 6 would directly lead to excessively rapid heat loss; therefore, the inner heat insulation part 7 and the outer heat insulation part 8 are provided.

[0030] Specifically, the inner heat insulation part 7 includes a first heat insulation fiber layer 9, a first heat insulation blanket layer 10, and a second heat insulation fiber layer 11, which are sequentially stacked on the outer surface of the inner container 1. The outer heat insulation part 8 includes a second heat insulation blanket layer 12 and a third heat insulation fiber layer 13, which are sequentially stacked on the outer surface of the inner container 1.

[0031] Furthermore, the first insulation layer 10 and the second insulation layer 12 are composed of several layers of aluminum foil and insulation paper stacked together. The first insulation layer 10 and the second insulation layer 12 have 50 layers, including 25 layers of aluminum foil and 25 layers of insulation paper, which are stacked alternately in one step.

[0032] The first heat insulation fiber layer 9, the second heat insulation fiber layer 11, and the third heat insulation fiber layer 13 are selected from any one of glass fiber cotton, ceramic fiber, rock wool, and aerogel heat insulation fiber.

[0033] Furthermore, the first heat-insulating fiber layer 9, the first heat-insulating blanket layer 10, and the second heat-insulating fiber layer 11 are all processed into circular pads, such that the diameter of the first heat-insulating fiber layer 9, the first heat-insulating blanket layer 10, and the second heat-insulating fiber layer 11 is 3 to 8% larger than the inner diameter of the main support 6, so that the first heat-insulating fiber layer 9, the first heat-insulating blanket layer 10, and the second heat-insulating fiber layer 11 are fixed in the main support 6 by an interference fit.

[0034] Specifically, a layer of glass fiber cotton with a diameter of Φ180mm is first filled into the hollow part of the main support 6 near the inner container 1. Its diameter is larger than the inner diameter of the main support 6. After being filled in, it forms a rigid fit. Then, a heat insulation blanket with a diameter of Φ180mm is filled in. The 50-layer heat insulation blanket is composed of aluminum foil and heat insulation paper. The aluminum foil has good heat reflection properties and can reflect most of the heat. Then, three layers of glass fiber cotton are filled between it and the positioning groove 5.

[0035] The outer heat insulation part 8 is located around the outside of the main support 6. The outer heat insulation part 8 is ring-shaped, and is first filled with 50 layers of annular Φ340 / Φ220 insulation blankets near the inner container 1, followed by one layer of Φ340 / Φ220 glass fiber wool. Measurements showed that the external temperature of the positioning groove 5 at the eight-point support was close to room temperature, and no frost was observed on the outside of the eight-point support after the inner container 1 was filled with liquid. No cracks were found in the welded joints at the eight-point support, thus meeting the structural strength requirements while reducing heat conduction and achieving an ideal heat insulation effect.

[0036] As an improvement, a nano-aerogel felt layer 14 is also included, which is disposed between the insulating fiber layer and the insulating blanket layer. Nano-aerogel has extremely low thermal conductivity and is one of the solid materials with excellent thermal insulation performance. Its unique nanoscale porous structure can greatly hinder heat conduction, effectively reducing heat leakage at the eight-point support. The thickness of the aerogel felt can be determined according to the actual space and insulation requirements, and can be set to 5-10 mm.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-efficiency thermal insulation support structure for a cryogenic liquid tank, comprising a double-layer tank structure formed by an inner container (1) and an outer container (2), wherein a plurality of support structures (3) are provided between the inner and outer containers (2), characterized in that, A heat insulation gap (4) is maintained between the inner container (1) and the outer container (2) by a support structure (3). The support structure (3) includes a positioning groove (5), a main support (6), and a heat insulation structure. The positioning groove (5) is fixedly set on the outer container (2). One end of the main support (6) is connected to the outer surface of the inner container (1), and the other end is inserted into the groove of the positioning groove (5). The main support (6) is a hollow cylindrical structure. The heat insulation structure includes an inner heat insulation part (7) set in the hollow part of the main support (6) and an outer heat insulation part (8) set on the outer periphery of the main support (6).

2. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 1, characterized in that, The inner heat insulation part (7) includes a first heat insulation fiber layer (9), a first heat insulation blanket layer (10), and a second heat insulation fiber layer (11) stacked sequentially on the outer surface of the inner container (1).

3. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 2, characterized in that, The outer heat insulation part (8) includes a second heat insulation layer (12) and a third heat insulation fiber layer (13) stacked sequentially on the outer surface of the inner container (1).

4. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 3, characterized in that, The first insulation layer (10) and the second insulation layer (12) are composed of several layers of aluminum foil and insulation paper stacked together.

5. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 3, characterized in that, The first heat insulation fiber layer (9), the second heat insulation fiber layer (11), and the third heat insulation fiber layer (13) are selected from any one of glass fiber cotton, ceramic fiber, rock wool, and aerogel heat insulation fiber.

6. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 2, characterized in that, The first heat insulation fiber layer (9), the first heat insulation blanket layer (10), and the second heat insulation fiber layer (11) are all processed into circular pads, so that the diameter of the first heat insulation fiber layer (9), the first heat insulation blanket layer (10), and the second heat insulation fiber layer (11) is 3~8% larger than the inner diameter of the main support (6), so that the first heat insulation fiber layer (9), the first heat insulation blanket layer (10), and the second heat insulation fiber layer (11) are fixed in the main support (6) by interference fit.

7. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 4, characterized in that, The first insulation layer (10) and the second insulation layer (12) are provided with 50 layers, including 25 layers of aluminum foil and 25 layers of insulation paper, so that the aluminum foil and insulation paper are stacked alternately.

8. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 3, characterized in that, It also includes a nano-aerogel felt layer (14), which is disposed between the heat insulation fiber layer and the heat insulation blanket layer, and the thickness of the nano-aerogel felt layer (14) is 5-10 mm.

9. The high-efficiency thermal insulation support structure (3) for a cryogenic liquid tank body according to claim 1, characterized in that, A support group is formed by multiple support structures (3). Multiple support groups are arranged along the axial direction of the cryogenic liquid tank. The support structure (3) in each support group is arranged circumferentially around the cryogenic liquid tank.

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