Ultra-low temperature vacuum jacketed connecting flange

Abstract

The utility model discloses a kind of ultra-low temperature vacuum jacketed flange, it includes pipe and spigot of end flange connection, pipe and spigot are formed into double-layer vacuum pipe structure with inner layer and outer layer;The inner layer of pipe is formed with heat bridge pipe groove and bellows in one end close to flange, one end of heat bridge pipe groove is connected with the flange of pipe, the other end is connected with bellows;The inner layer and outer layer of spigot are extended outward with heat bridge pipe that can be inserted into heat bridge pipe groove in end part close to flange;Fluid passage cross section is staggered with the end surface of the flange connection of pipe or spigot by heat bridge pipe extended by spigot, to reduce the heat exchange effect of flange connection in this way;After heat bridge pipe extended by spigot is inserted into heat bridge pipe groove of pipe, fluid passage cross section is staggered with flange end surface, i.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic medium transportation technology, specifically to a cryogenic vacuum jacket connection flange. Background Technology

[0002] In cryogenic or ultra-crescent gas transportation systems, such as those for liquid nitrogen, liquid hydrogen, and liquefied natural gas, cryogenic liquefied gases typically need to be transmitted via pipelines connected to flanges. Because the medium temperature is extremely low, reaching -196°C or even lower, ambient heat can easily be conducted into the pipe through the flange's metal structure, leading to the following problems:

[0003] (1) Medium absorbs heat and vaporizes: External heat is introduced, causing the low-temperature liquid to absorb heat and rise in temperature, and some of the medium vaporizes, affecting the transport efficiency and potentially causing pipeline pressure fluctuations;

[0004] (2) Cooling loss: As a metal connector, the flange has high thermal conductivity and becomes the main thermal bridge, causing cooling loss in the system and increasing refrigeration energy consumption;

[0005] (3) Vacuum insulation failure: If the traditional flange structure is not optimized, its connection may disrupt the continuity of the vacuum jacket and reduce the overall insulation performance.

[0006] Therefore, there is an urgent need for an ultra-low temperature vacuum jacketed flange structure that can ensure both sealing and connection strength while effectively suppressing heat conduction. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing an ultra-low temperature vacuum jacket connection flange that appropriately extends the vacuum pipe section, causing the cross-section of the fluid channel to be offset from the connection end face of the pipe flange, thereby reducing the heat exchange effect at the flange connection and maximizing the protection of the normal operation of ultra-low temperature medium transportation.

[0008] The technical problem to be solved by this utility model is achieved through the following technical solution: an ultra-low temperature vacuum jacket connection flange, which includes a connecting pipe and a insert pipe connected to the end flange, and both the connecting pipe and the insert pipe are formed into a double-layer vacuum tube structure with an inner layer and an outer layer.

[0009] A thermal bridge groove and a bellows are formed at one end of the inner layer of the pipe near the flange. One end of the thermal bridge groove is connected to the flange of the pipe, and the other end is connected to the bellows.

[0010] The inner and outer ends of the insertion tube near the flange extend outwards with a heat bridge tube that can be inserted into the heat bridge tube groove;

[0011] The thermal bridge tube extended by the insertion tube causes the cross-section of the fluid channel to be offset from the end face of the flange connection of the tube or insertion tube, thereby reducing the heat exchange effect at the flange connection.

[0012] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the ultra-low temperature vacuum jacket connecting flange described above has a leak detection hole on the flange for connecting the pipe to the insertion flange. The leak detection hole is located on the outer circumferential surface of the flange and communicates with the inner circumferential surface of the thermal bridge pipe groove.

[0013] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the ultra-low temperature vacuum jacketed connecting flange described above has a sealing element provided on the end face of the heat bridge tube away from the insertion tube, which can abut against the bottom of the heat bridge tube groove.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the ultra-low temperature vacuum jacket connecting flange described above, wherein the bottom of the heat bridge tube groove and the end of the heat bridge tube form a mutually cooperating conical surface.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the ultra-low temperature vacuum jacketed connecting flange described above, wherein the outer diameter and length of the thermal bridge tube are the same as the inner diameter and length of the thermal bridge tube groove.

[0016] Compared with the prior art, the beneficial technical effects of this utility model are:

[0017] (1) The inner layer of the pipe is equipped with a corrugated pipe, which can effectively absorb the cold shrinkage deformation of the inner pipe under ultra-low temperature conditions, avoid the failure of the flange sealing surface due to shrinkage, and ensure the sealing reliability of the connection.

[0018] (2) After the heat bridge tube of the extension tube is inserted into the heat bridge tube groove of the connecting tube, the cross section of the fluid channel is offset from the flange end face, that is, not on the same plane, which can significantly reduce the heat conduction at the flange connection and reduce the transfer of external heat to the low temperature medium at the connection end face.

[0019] (3) A leak detection hole is provided on the connecting flange to communicate with the thermal bridge pipe groove, which can be used to check the internal sealing status after assembly, ensure the sealing performance of the vacuum jacket, and facilitate maintenance and troubleshooting.

[0020] (4) A sealing element is provided at the end of the heat bridge tube, which abuts against the bottom of the heat bridge tube groove to form a sealing structure. This structure helps to ensure the reliability of the seal.

[0021] (5) The bottom of the heat bridge tube groove and the end of the heat bridge tube adopt a conical mating structure. On the one hand, it plays an automatic centering and guiding role during assembly, avoiding sealing failure caused by eccentricity and improving installation accuracy. On the other hand, it also makes the contact area between the heat bridge tube groove and the heat bridge tube larger, making them fit more tightly and ensuring the sealing effect to a certain extent.

[0022] (6) The outer diameter and length of the thermal bridge tube are the same as the inner diameter and length of the thermal bridge tube groove to ensure a tight fit, reduce the thermal bridge effect, and maintain structural stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the main structure of the present invention when the connecting pipe and the insertion tube are not connected;

[0024] Figure 2 This is a front view structural diagram of the connection between the tube and the insertion tube of this utility model.

[0025] Figure label:

[0026] 1. Connecting pipe; 2. Inserting pipe; 3. Bellows; 4. Seal; 5. Thermal bridge pipe; 6. Leak detection hole; 7. Conical surface; 8. Thermal bridge pipe groove; 9. Flange. Detailed Implementation

[0027] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0028] Example 1, referring to Figure 1-2 A cryogenic vacuum jacket connection flange includes a connecting pipe 1 and a insertion pipe 2 connected to the end flange. Both the connecting pipe 1 and the insertion pipe 2 are formed as a double-layer vacuum tube structure with an inner layer and an outer layer. The materials of the inner layer and the outer layer can be selected according to the usage requirements. The inner layer and the outer layer are set as a concentric structure with one inner and one outer layer.

[0029] A thermal bridge groove 8 and a bellows 3 are formed at one end of the inner layer of the connector 1 near the flange 9. The longitudinal section of the thermal bridge groove 8 is circular. One end of the thermal bridge groove 8 is connected to the flange 9 of the connector 1, and the other end is connected to the bellows 3. The material of the bellows 3 can be selected according to the temperature of the cryogenic medium. In order to improve the sealing performance of the connector 1 and the insert 2, a sealing element 4 is provided on the end face of the thermal bridge tube away from the insert 2, which can abut against the bottom of the groove of the thermal bridge groove 8. The sealing element 4 can be a non-metallic sealing ring, and its material can be selected according to the application requirements.

[0030] It should be noted that the corrugated pipe 3 and the thermal bridge groove 8 can also be not directly connected. That is to say, a straight pipe can be reserved between the corrugated pipe 3 and the thermal bridge groove 8 as a connection medium. In other words, the corrugated pipe 3, the straight pipe and the thermal bridge groove 8 have a front, middle and rear structure, which serves as a connection transition.

[0031] The inner and outer ends of the insertion tube 2 near the flange 9 extend outward to form a heat bridge tube 5 that can be inserted into the heat bridge tube groove 8. The longitudinal section of the heat bridge tube 5 is roughly circular. The outer diameter and length of the heat bridge tube 5 are the same as the inner diameter and length of the heat bridge tube groove 8. The specific dimensions can be selected according to the usage requirements to ensure a tight fit, reduce the heat bridge effect, and maintain structural stability.

[0032] The thermal bridge pipe 5, which is extended by the insertion pipe 2, makes the cross-section of the fluid channel offset from the end face of the flange 9 of the connecting pipe 1 or the insertion pipe 2, thereby reducing the heat exchange effect at the flange 9 connection.

[0033] In order to enable the connector 1 to have a certain leak detection performance, a leak detection hole 6 is provided on the flange 9 of the connector 1 for connecting to the flange 9 of the insertion pipe 2. The leak detection hole 6 is located on the outer peripheral surface of the flange 9 and is connected to the inner peripheral surface of the thermal bridge groove 8.

[0034] To improve the sealing of the connection between the connector 1 and the insertion tube 2, the bottom of the heat bridge groove 8 and the end of the heat bridge tube 5 are formed with a matching conical surface 7. This conical surface 7 causes the end of the heat bridge tube 5 to form a roughly frustum-shaped structure, and its inclined surface is formed as the conical surface 7. The taper of the conical surface 7 can be selected according to the usage requirements. Correspondingly, the bottom of the heat bridge groove 8 also has a groove with the same structure, such as a frustum-shaped groove.

[0035] When using the cryogenic vacuum jacket connecting flange 9 in Example 1, only the flange 9 parts of the connecting pipe 1 and the insert pipe 2 need to be bolted together to complete the assembly. During use, the leak detection hole 6 can be used to observe whether there is any leakage. Because the extension of the insert pipe 2 can make the fluid channel cross-section and the end face connected to the flange 9 staggered, the fluid channel cross-section is located at the bottom of the thermal bridge tube groove 8. The bottom of the groove is still a double-layer vacuum tube structure. Therefore, the fluid channel cross-section still has good heat exchange suppression performance, avoiding external heat from causing heat exchange to the fluid in the connecting pipe 1 and the insert pipe 2 through the flange 9 connection, thereby achieving the purpose of reducing the transfer of external heat into the connecting pipe 1 and the insert pipe 2.

Claims

1. A cryogenic vacuum jacketed connection flange, characterized in that: It includes a connector and a tube with end flange connection, both of which are formed as a double-layer vacuum tube structure with an inner layer and an outer layer; A thermal bridge groove and a bellows are formed at one end of the inner layer of the pipe near the flange. One end of the thermal bridge groove is connected to the flange of the pipe, and the other end is connected to the bellows. The inner and outer ends of the insertion tube near the flange extend outwards with a heat bridge tube that can be inserted into the heat bridge tube groove; The thermal bridge tube extended by the insertion tube causes the cross-section of the fluid channel to be offset from the end face of the flange connection of the tube or insertion tube, thereby reducing the heat exchange effect at the flange connection.

2. The cryogenic vacuum jacketed connection flange according to claim 1, characterized in that: A leak detection hole is provided on the flange for connection with the insertion flange. The leak detection hole is located on the outer circumferential surface of the flange and communicates with the inner circumferential surface of the thermal bridge pipe groove.

3. The cryogenic vacuum jacketed connection flange according to claim 1, characterized in that: A sealing element is provided on the end face of the thermal bridge tube away from the insertion tube, which can abut against the bottom of the groove of the thermal bridge tube.

4. The cryogenic vacuum jacketed connection flange according to claim 1, characterized in that: The bottom of the heat bridge tube groove and the end of the heat bridge tube form a matching conical surface.

5. The cryogenic vacuum jacketed connection flange according to claim 1, characterized in that: The outer diameter and length of the heat bridge tube are the same as the inner diameter and length of the heat bridge tube groove.

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