Liquid-phase damper for pressure measurement of low-temperature liquid insulation tank car

Abstract

The present application relates to the technical fields of low-temperature liquid storage and transportation, and particularly relates to a liquid-phase damper for pressure measurement of a low-temperature liquid adiabatic tank car, which comprises a pressure measurement pipeline in communication with an inner container of the low-temperature liquid adiabatic tank car and leading out of an outer container of the low-temperature liquid adiabatic tank car through an adiabatic space between the inner container and the outer container of the low-temperature liquid adiabatic tank car, a heat transfer element connected to an outer circle of a section of the pressure measurement pipeline located in the adiabatic space, and the heat transfer element connected to an inner wall of the outer container. The present application improves the stability and reliability of pressure measurement of the low-temperature liquid adiabatic tank car.

Description

Technical Field

[0001] This invention relates to the field of cryogenic liquid storage and transportation technology, specifically to a liquid phase damper for pressure measurement in a cryogenic liquid insulated tank truck. Background Technology

[0002] A cryogenic liquid insulated tank truck is a mobile cryogenic liquid transport container used for storing cryogenic liquids and capable of road transport. It typically employs a semi-trailer structure. The overall structure of the tank truck includes the tank body, a running gear located at the rear of the tank body, and a towing pin assembly located at the front of the tank body for connecting to the tractor unit. Using the towing pin assembly on the tank body, the cryogenic liquid insulated tank truck can be connected to the semi-trailer unit, thus enabling the transport of cryogenic liquid insulated tank trucks.

[0003] The tank of the cryogenic liquid insulated tank truck is a double-walled tank. The inner tank (inner container) is used to store cryogenic liquids such as liquid hydrogen, liquid oxygen, liquid nitrogen, and liquefied gas (temperatures are usually below -100℃). The outer tank (outer container) is set around the inner tank, and the sealed space between the outer tank and the inner tank is evacuated to form an insulated space. In addition, the inner tank is also equipped with a layer of insulation material.

[0004] To ensure the safety of cryogenic liquid insulated tank trucks, real-time monitoring of the tank's internal pressure is necessary. Therefore, a pressure testing line is extended from the inner tank, and a pressure gauge is connected to this line. The specific pressure measurement method involves drawing the cryogenic liquid from the tank through the pressure testing line, where it is converted into gas. The pressure of this gas is then measured to assess the internal pressure of the tank.

[0005] However, in the pressure measurement method described above, there is a transition region inside the pressure measuring pipeline that converts the cryogenic liquid into gas. This transition region is a mixture of liquid and gas phases. When the mixed phase extends to a section of the pressure measuring pipeline outside the tank, it will reduce the stability and reliability of the pressure measurement. Summary of the Invention

[0006] To address the aforementioned problems, this invention proposes a liquid-phase damper for pressure measurement in cryogenic liquid insulated tank trucks, aiming to improve the stability and reliability of pressure measurement in these trucks. The specific technical solution is as follows:

[0007] A pressure measuring liquid phase damper for a cryogenic liquid insulated tank truck includes a pressure measuring pipeline that communicates with the inner container of the cryogenic liquid insulated tank truck and passes through the insulation space between the inner container and the outer container of the cryogenic liquid insulated tank truck to the outside of the outer container. A heat transfer element is connected to the outer circle of a section of the pressure measuring pipeline located inside the insulation space. The heat transfer element is connected to the inner wall of the outer container.

[0008] Preferably, the heat transfer element is a heat-conducting metal component disposed on the outer wall of the pressure measuring pipeline and in contact with the outer wall of the pressure measuring pipeline.

[0009] As one of the preferred embodiments of the heat-conducting metal component in this invention, the heat-conducting metal component is a copper wire, and a spiral winding section is provided on the copper wire. The spiral winding section of the copper wire is sleeved on the outer wall of the pressure measuring pipeline and contacts the outer wall of the pressure measuring pipeline. The two ends of the copper wire of the spiral winding section are led out and connected to the inner wall of the outer container.

[0010] In this invention, a cryogenic liquid pipe is provided on the wall of the inner container. One end of the cryogenic liquid pipe is located inside the inner container, and the other end of the cryogenic liquid pipe is located in the insulation space and connected to the pressure measuring pipeline.

[0011] Preferably, a throttling nozzle is provided at one end of the cryogenic liquid tube located inside the inner container, and the throttling nozzle is provided with a throttling orifice communicating with the inner hole of the cryogenic liquid tube.

[0012] Preferably, the inner wall of the inner container is provided with a closed cover, and the section of the cryogenic liquid tube entering the inner container is covered by the closed cover. A gap for cryogenic liquid to pass through is provided between one side of the closed cover and the inner wall of the inner container, and a flow-limiting hole for cryogenic liquid to pass through is provided at the top of the closed cover.

[0013] Wherein, the cross-sectional area of ​​the liquid flowing through the gap is greater than the cross-sectional area of ​​the inner hole of the throttle nozzle, and the cross-sectional area of ​​the flow-limiting orifice is greater than the cross-sectional area of ​​the inner hole of the throttle nozzle.

[0014] As a second preferred embodiment of the heat-conducting metal component in this invention, the heat-conducting metal component is a U-shaped elastic metal clip. The U-shaped groove of the U-shaped elastic metal clip is engaged with both sides of the pressure measuring pipeline. Copper wires are led out from both ends of the U-shaped elastic metal clip to contact the inner wall of the outer container. A number of strip-shaped protrusions are provided at intervals on the clamping surface of the U-shaped elastic metal clip that contacts the pressure measuring pipeline to control excessive or insufficient heat transfer. The two sides of the pressure measuring pipeline are in corresponding contact with the strip-shaped protrusions.

[0015] Preferably, the strip protrusion on the U-shaped elastic metal clip can be formed by die stamping, and the clamping plane on the strip protrusion can be formed by wire cutting to contact the outer plane of the pressure measuring pipeline.

[0016] Preferably, the section of the pressure measuring pipe that contacts the U-shaped elastic metal clip is configured as a rectangular pressure measuring pipe.

[0017] Preferably, the rectangular pressure measuring pipeline has several grooves arranged at intervals on both sides along the longitudinal direction of the pressure measuring pipeline.

[0018] When the cryogenic liquid insulated tank truck is under ideal ambient temperature design conditions, by calculating the amount of heat transfer required for the liquid phase to transform into the gas phase on the pressure measuring pipeline, the contact length of the U-shaped elastic metal clip along the pressure measuring pipeline direction and the optimal contact area between the U-shaped elastic metal clip and the pressure measuring pipeline can be determined. Thus, the number and size of the corresponding strip protrusions on the clamping surface of the U-shaped elastic metal clip can be designed.

[0019] When the pressure testing pipeline is rectangular, the amount of heat transfer can be controlled by optimizing the number and size of the grooves on the pressure testing pipeline.

[0020] As a further improvement of the present invention, an automatic heat transfer balance compensator for dynamically balancing the amount of heat transfer is further provided between the U-shaped elastic metal clip and the pressure measuring pipeline. The automatic heat transfer balance compensator includes setting the strip-shaped boss on the clamping surface of the U-shaped elastic metal clip as a trapezoidal boss, and providing a thermal expansion device between the bottom of the U-shaped groove of the U-shaped elastic metal clip and the pressure measuring pipeline. One end of the thermal expansion device is fixedly connected to the bottom of the U-shaped groove of the U-shaped elastic metal clip, and the other end of the thermal expansion device is fixedly connected to the side of the pressure measuring pipeline that is directly opposite to the bottom of the U-shaped groove. The width of the trapezoidal boss gradually decreases from the bottom of the U-shaped groove to the opening of the U-shaped groove.

[0021] By setting the trapezoidal protrusion on the clamping surface of the aforementioned U-shaped elastic metal clip, the contact area between the clamping surface of the U-shaped elastic metal clip and the pressure measuring pipeline can be changed. For example, when the U-shaped elastic metal clip moves laterally towards the bottom of its U-shaped groove towards the pressure measuring pipeline, the contact area between the clamping surface of the U-shaped elastic metal clip and the pressure measuring pipeline will decrease, and vice versa.

[0022] Without an automatic heat transfer balance compensator, when the cryogenic liquid insulated tank truck experiences significant fluctuations in temperature relative to the ideal ambient design conditions or other disturbances, the heat transfer balance of the heat-conducting metal components used for liquid phase damping will be disrupted. This results in either too much or too little heat being transferred from the outer container wall to the pressure measuring line. If too little heat is transferred to the pressure measuring line, the cryogenic liquid introduced from the inner container into the line may not completely vaporize, affecting subsequent pressure measurements. If too much heat is transferred, while sufficient liquid phase damping may be achieved, excess heat will remain in the insulation space and transfer to the inner container, reducing the insulation effect of the cryogenic liquid insulated tank truck and increasing the safety risk of a rapid increase in internal pressure.

[0023] When an automatic heat transfer balance compensator is installed, if insufficient heat is transferred to the pressure measuring pipeline due to ambient temperature or other interference factors, the temperature of the pressure measuring pipeline will be lower than normal. The thermal expansion tank will receive less heat and thus contract, causing it to move synchronously with the U-shaped elastic metal clips (the U-shaped elastic metal clips move laterally towards the bottom of their U-shaped grooves towards the pressure measuring pipeline). This increases the contact area between the clamping surface of the U-shaped elastic metal clips and the pressure measuring pipeline, allowing more heat from the outer container wall to be transferred to the pressure measuring pipeline, causing the temperature of the pressure measuring pipeline to rise and maintain its normal operating temperature. The balance of heat transfer is maintained; conversely, if excessive heat is transferred to the pressure measuring pipeline due to ambient temperature or other interference factors, the temperature of the pressure measuring pipeline will be too high. The thermal expansion device will receive more heat and thus expand and deform, causing the U-shaped elastic metal clip to move synchronously (the U-shaped elastic metal clip moves laterally away from the pressure measuring pipeline towards the bottom of its U-shaped groove). This reduces the contact area between the clamping surface of the U-shaped elastic metal clip and the pressure measuring pipeline, so less heat from the outer container wall will be transferred to the pressure measuring pipeline, causing the temperature of the pressure measuring pipeline to decrease, thereby maintaining the balance of heat transfer.

[0024] Preferably, a tension spring is also connected between the cantilever ends of a pair of elastic clamping plates of the U-shaped elastic metal clip.

[0025] Preferably, a hanging plate is provided at the cantilever end of the elastic clamping piece, and a spring hook groove is provided on the hanging plate, with the end of the tension spring hooked onto the spring hook groove of the hanging plate.

[0026] As one of the preferred embodiments of the thermal expander in this invention, the thermal expander is a strip-shaped bimetallic sheet.

[0027] Preferably, the middle part of the strip bimetallic strip is fixedly connected to the pressure measuring pipeline, and the two ends of the strip bimetallic strip are fixedly connected to the bottom sides of the U-shaped slot, respectively.

[0028] As a second preferred embodiment of the thermal expander in this invention, the thermal expander is a disc-shaped bimetallic strip assembly formed by stacking and connecting several disc-shaped bimetallic strips into one piece.

[0029] Preferably, the joint between two adjacent disc-shaped bimetallic strips is formed by welding to create an integral connection.

[0030] Preferably, the number of the disc-shaped bimetallic strip assemblies is two sets, and they are arranged at longitudinal intervals along the pressure measuring pipeline.

[0031] The beneficial effects of this invention are:

[0032] First, the present invention provides a liquid phase damper for pressure measurement of a cryogenic liquid insulated tank truck. By setting a heat transfer element on a section of the pressure measurement pipeline located in the insulation space and connecting the heat transfer element to the inner wall of the outer container, the pressure measurement pipeline can absorb a small amount of heat from the outer container wall, thereby accelerating the vaporization of the mixed phase inside the pressure measurement pipeline. This effectively prevents the cryogenic liquid from extending towards the pressure measurement end within the pressure measurement pipeline, thereby improving the stability and reliability of pressure measurement in the cryogenic liquid insulated tank truck.

[0033] Secondly, the liquid phase damper for pressure measurement of a cryogenic liquid insulated tank truck of the present invention, by providing a closed cover on the inner wall of the inner container, and providing a gap between the cover and the inner wall of the inner container, and providing a flow-limiting hole on the cover, can reduce the fluctuation of the liquid inside the closed cover and avoid the influence of the cryogenic liquid surge inside the tank, thereby improving the accuracy of pressure measurement.

[0034] Third, the liquid phase damper for pressure measurement of a cryogenic liquid insulated tank truck of the present invention, by setting an automatic heat transfer balance compensator between the U-shaped elastic metal clip and the pressure measurement pipeline, can avoid the drawback of too much or too little heat being transferred to the pressure measurement pipeline due to the influence of ambient temperature or other interference factors. While ensuring that the liquid phase inside the pressure measurement pipeline is fully converted into gas, it improves the insulation effect of the cryogenic liquid insulated tank truck, which is conducive to avoiding or reducing the safety risk of rapid increase in internal pressure of the tank due to excessive heat transfer. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a liquid phase damper for pressure measurement in a cryogenic liquid insulated tank truck according to the present invention.

[0036] Figure 2 Is Figure 1 The structural diagram is based on the addition of an automatic heat transfer balance compensator (where a disc-shaped bimetallic strip assembly is used as a thermal expander).

[0037] Figure 3 yes Figure 2 A magnified view of a portion of the view;

[0038] Figure 4 Is Figure 1 The structural diagram is based on the addition of an automatic heat transfer balance compensator (in which a strip bimetallic strip is used as a thermal expansion device).

[0039] Figure 5 yes Figure 4 A magnified view of a portion of the view;

[0040] Figure 6 This is a schematic diagram of a circular pressure testing pipeline that is in contact with the U-shaped elastic metal clip.

[0041] Figure 7 This is a schematic diagram of a rectangular pressure testing pipeline that is in contact with the U-shaped elastic metal clip.

[0042] Figure 8 yes Figure 6 A schematic diagram of the structure of the thermal expander using a disc-shaped bimetallic strip assembly.

[0043] In the diagram: 101, Inner container; 102, Outer container; 103, Insulated space; 104, Pressure measuring line; 105, Heat transfer element; 106, Copper wire; 107, Spiral wound section; 108, Cryogenic liquid pipe; 109, Throttling nozzle; 110, Enclosed casing; 111, Gap; 112, Flow-limiting orifice; 113, Automatic heat transfer balance compensator; 114, U-shaped elastic metal clip; 115, Thermal expansion device; 116, Strip boss; 117, Elastic clamping plate; 118, Hanging plate; 119, Tension spring; 120, Strip bimetallic strip; 121, Disc bimetallic strip assembly; 122, U-shaped slot; 123, Groove. Detailed Implementation

[0044] The specific embodiments of the present invention 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 solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0045] like Figures 1 to 8 The illustration shows an embodiment of a pressure measuring liquid phase damper for a cryogenic liquid insulated tanker according to the present invention. It includes a pressure measuring pipe 104 that communicates with the inner container 101 of the cryogenic liquid insulated tanker and passes through the insulation space 103 between the inner container 101 and the outer container 102 of the cryogenic liquid insulated tanker and leads out to the outside of the outer container 102. A heat transfer element 105 is connected to the outer circle of a section of the pressure measuring pipe 104 located inside the insulation space 103. The heat transfer element 105 is connected to the inner wall of the outer container 102.

[0046] Preferably, the heat transfer element 105 is a heat-conducting metal component disposed on the outer wall of the pressure measuring pipe 104 and in contact with the outer wall of the pressure measuring pipe 104.

[0047] As one of the preferred options for the heat-conducting metal component in this embodiment, the heat-conducting metal component is a copper wire 106. A spiral winding section 107 is provided on the copper wire 106. The spiral winding section 107 of the copper wire 106 is sleeved on the outer wall of the pressure measuring pipe 104 and contacts the outer wall of the pressure measuring pipe 104. The two ends of the copper wire 106 of the spiral winding section 107 are led out and connected to the inner wall of the outer container 102.

[0048] In this embodiment, a cryogenic liquid pipe 108 is provided on the tank wall of the inner container 101. One end of the cryogenic liquid pipe 108 is located inside the inner container 101, and the other end of the cryogenic liquid pipe 108 is located inside the insulation space 103 and connected to the pressure measuring pipeline 104.

[0049] Preferably, a throttling nozzle 109 is provided at one end of the cryogenic liquid tube 108 located inside the inner container 101, and the throttling nozzle 109 is provided with a throttling orifice that communicates with the inner hole of the cryogenic liquid tube 108.

[0050] Preferably, a closed cover 110 is provided on the inner wall of the inner container 101, and the section of the cryogenic liquid tube entering the inner container is covered by the closed cover 110. A gap 111 for cryogenic liquid to pass through is provided between one side of the closed cover 110 and the inner wall of the inner container 101, and a flow-limiting hole 112 for cryogenic liquid to pass through is provided on the top of the closed cover 110.

[0051] Wherein, the cross-sectional area through which the liquid formed by the gap 111 passes is greater than the cross-sectional area of ​​the inner hole of the throttle nozzle 109, and the cross-sectional area of ​​the flow-limiting orifice 112 is greater than the cross-sectional area of ​​the inner hole of the throttle nozzle.

[0052] As a second preferred embodiment of the heat-conducting metal component, the heat-conducting metal component is a U-shaped elastic metal clip 114. The U-shaped groove 122 of the U-shaped elastic metal clip 114 is engaged with both sides of the pressure measuring pipe 104. Copper wires 106 are led out from both ends of the U-shaped elastic metal clip 114 to contact the inner wall of the outer container 102. A number of strip-shaped protrusions 116 are provided at intervals on the clamping surface of the U-shaped elastic metal clip 114 that contacts the pressure measuring pipe 104 to control excessive or insufficient heat transfer. The two sides of the pressure measuring pipe 104 are in corresponding contact with the strip-shaped protrusions 116.

[0053] Preferably, the strip protrusion 116 on the U-shaped elastic metal clip 114 can be formed by die stamping, and the clamping plane on the strip protrusion 116 that contacts the outer plane of the pressure measuring pipe 104 can be formed by wire cutting.

[0054] Preferably, the section of the pressure measuring pipe 104 that contacts the U-shaped elastic metal clip 114 is configured as a rectangular pressure measuring pipe.

[0055] Preferably, the rectangular pressure measuring pipeline 104 has several spaced grooves 123 arranged along the longitudinal direction of the pressure measuring pipeline 104 on both sides.

[0056] When the cryogenic liquid insulated tank truck is under ideal ambient temperature design conditions, by calculating the amount of heat transfer required for the liquid phase to transform into the gas phase on the pressure measuring pipeline 104, the contact length of the U-shaped elastic metal clip 114 along the direction of the pressure measuring pipeline 104 and the optimal contact area between the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104 can be determined. Thus, the number and size of the corresponding strip protrusions 116 on the clamping surface of the U-shaped elastic metal clip 114 can be designed.

[0057] When the pressure measuring line 104 is a rectangular pressure measuring line, the amount of heat transfer can also be controlled by optimizing the number and size of the grooves 123 on the pressure measuring line 104.

[0058] As a further improvement to this embodiment, an automatic heat transfer balance compensator 113 for dynamically balancing the amount of heat transfer is further provided between the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104. The automatic heat transfer balance compensator 113 includes setting the strip-shaped boss 116 on the clamping surface of the U-shaped elastic metal clip 114 as a trapezoidal boss, and providing a thermal expansion device 115 between the bottom of the U-shaped groove 122 of the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104. One end of the thermal expansion device 115 is fixedly connected to the bottom of the U-shaped groove 122 of the U-shaped elastic metal clip 114, and the other end of the thermal expansion device 115 is fixedly connected to the side of the pressure measuring pipeline 104 that is directly opposite to the bottom of the U-shaped groove 122. The width of the trapezoidal boss gradually decreases from the bottom of the U-shaped groove 122 to the opening of the U-shaped groove 122.

[0059] By providing the trapezoidal protrusion on the clamping surface of the U-shaped elastic metal clip 114, the contact area between the clamping surface of the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104 can be changed. For example, when the U-shaped elastic metal clip 114 moves laterally towards the bottom of its U-shaped slot and closer to the pressure measuring pipeline 104, the contact area between the clamping surface of the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104 will decrease, and vice versa.

[0060] Without the automatic heat transfer balance compensator 113, when the cryogenic liquid insulated tank truck experiences significant fluctuations in operating temperature relative to the ideal ambient temperature design conditions or other disturbances, the heat transfer balance of the heat-conducting metal components used for liquid phase damping will be disrupted. This results in either too much or too little heat being transferred from the outer container 102 tank wall to the pressure measuring line 104. If too little heat is transferred to the pressure measuring line 104, the cryogenic liquid introduced from the inner container into the pressure measuring line 104 may not be completely vaporized, thus affecting subsequent pressure measurements. If too much heat is transferred to the pressure measuring line 104, although the liquid phase damping effect can be fully achieved, excess heat will remain in the insulation space 103 and be transferred to the inner container 101, thereby reducing the insulation effect of the cryogenic liquid insulated tank truck and increasing the safety risk of a rapid increase in internal pressure.

[0061] When the automatic heat transfer balance compensator 113 is installed, if insufficient heat is transferred to the pressure measuring pipeline 104 due to ambient temperature or other interference factors, the temperature of the pressure measuring pipeline 104 will be lower than normal. The thermal expansion tank 115 will receive less heat and thus contract, causing the U-shaped elastic metal clip 114 to move synchronously (the U-shaped elastic metal clip 114 moves laterally towards the bottom of its U-shaped groove 122 towards the pressure measuring pipeline 104). This increases the contact area between the clamping surface of the U-shaped elastic metal clip 114 and the pressure measuring pipeline 104, allowing more heat from the outer container 102 wall to be transferred to the pressure measuring pipeline 104, causing the temperature of the pressure measuring pipeline 104 to rise, thereby maintaining... Maintaining a balance in heat transfer; conversely, if excessive heat is transferred to the pressure measuring line 104 due to ambient temperature or other interference factors, the temperature of the pressure measuring line 104 will be too high. The thermal expansion device 115 will receive more heat and thus expand and deform, causing the U-shaped elastic metal clip 114 to move synchronously (the U-shaped elastic metal clip 114 moves laterally away from the pressure measuring line 104 towards the bottom of its U-shaped groove 122). This reduces the contact area between the clamping surface of the U-shaped elastic metal clip 114 and the pressure measuring line 104, thus reducing the amount of heat transferred from the outer container 102 tank wall to the pressure measuring line 104, lowering the temperature of the pressure measuring line 104, and thus maintaining a balance in heat transfer.

[0062] Preferably, a tension spring 119 is also connected between the cantilever ends of a pair of elastic clamping plates 117 of the U-shaped elastic metal clip 114.

[0063] Preferably, a hanging plate 118 is provided at the cantilever end of the elastic clamping piece 117, and a spring hook groove is provided on the hanging plate 118, and the end of the tension spring 119 is hooked on the spring hook groove of the hanging plate 118.

[0064] As one of the preferred options for the thermal expander in this embodiment, the thermal expander 115 is a strip-shaped bimetallic sheet.

[0065] Preferably, the middle part of the strip bimetallic strip is fixedly connected to the pressure measuring pipeline 104, and the two ends of the strip bimetallic strip are fixedly connected to the bottom sides of the U-shaped slot 122, respectively.

[0066] As a second preferred embodiment of the thermal expander, the thermal expander 115 is a disc-shaped bimetallic strip assembly 121 formed by stacking and connecting several disc-shaped bimetallic strips into one piece.

[0067] Preferably, the joint between two adjacent disc-shaped bimetallic strips is formed by welding to create an integral connection.

[0068] Preferably, the number of the disc-shaped bimetallic strip assemblies 121 is two sets, and they are arranged at longitudinal intervals along the pressure measuring pipeline 104.

[0069] The above description is only a preferred embodiment of the present invention. 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 invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A liquid-phase damper for pressure measurement in a cryogenic liquid insulated tank truck, characterized in that, It includes a pressure measuring pipeline that is connected to the inner container of the cryogenic liquid insulated tank truck and passes through the insulation space between the inner container and the outer container of the cryogenic liquid insulated tank truck to the outside of the outer container. A heat transfer element is connected to the outer circle of a section of the pressure measuring pipeline located inside the insulation space. The heat transfer element is connected to the inner wall of the outer container. The heat transfer element is a heat-conducting metal component disposed on the outer wall of the pressure measuring pipeline and in contact with the outer wall of the pressure measuring pipeline; The heat-conducting metal component is a U-shaped elastic metal clip. The U-shaped groove of the U-shaped elastic metal clip is engaged with both sides of the pressure measuring pipeline. Copper wires are led out from both ends of the U-shaped elastic metal clip to contact the inner wall of the outer container. A number of strip-shaped protrusions are provided at intervals on the clamping surface of the U-shaped elastic metal clip that contacts the pressure measuring pipeline to control excessive or insufficient heat transfer. The two sides of the pressure measuring pipeline are in corresponding contact with the strip-shaped protrusions. An automatic heat transfer balance compensator is also provided between the U-shaped elastic metal clip and the pressure measuring pipeline for dynamically balancing the amount of heat transfer. The automatic heat transfer balance compensator includes setting the strip-shaped boss on the clamping surface of the U-shaped elastic metal clip as a trapezoidal boss, and setting a thermal expansion device between the bottom of the U-shaped groove of the U-shaped elastic metal clip and the pressure measuring pipeline. One end of the thermal expansion device is fixedly connected to the bottom of the U-shaped groove of the U-shaped elastic metal clip, and the other end of the thermal expansion device is fixedly connected to the side of the pressure measuring pipeline that is directly opposite to the bottom of the U-shaped groove. The width of the trapezoidal boss gradually decreases from the bottom of the U-shaped groove to the opening of the U-shaped groove.

2. The liquid-phase damper for pressure measurement of a cryogenic liquid insulated tank truck according to claim 1, characterized in that, A cryogenic liquid pipe is provided on the wall of the inner container. One end of the cryogenic liquid pipe is located inside the inner container, and the other end of the cryogenic liquid pipe is located in the insulation space and connected to the pressure measuring pipeline.

3. The liquid-phase damper for pressure measurement of a cryogenic liquid insulated tank truck according to claim 2, characterized in that, A throttling nozzle is provided at one end of the cryogenic liquid tube located inside the inner container, and the throttling nozzle is provided with a throttling orifice that communicates with the inner hole of the cryogenic liquid tube.

4. A liquid-phase damper for pressure measurement in a cryogenic liquid insulated tank truck according to claim 2, characterized in that, The inner wall of the inner container is provided with a closed cover. The section of the cryogenic liquid tube that enters the inner container is covered by the closed cover. A gap for cryogenic liquid to pass through is provided between one side of the closed cover and the inner wall of the inner container. A flow-limiting hole for cryogenic liquid to pass through is provided at the top of the closed cover.

5. A liquid-phase damper for pressure measurement in a cryogenic liquid insulated tank truck according to claim 1, characterized in that, The thermal expander is a strip-shaped bimetallic sheet.

6. A liquid-phase damper for pressure measurement in a cryogenic liquid insulated tank truck according to claim 1, characterized in that, The thermal expander is a disc-shaped bimetallic strip assembly formed by stacking and connecting several disc-shaped bimetallic strips into one piece.

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