Filling limiting mechanism without fullness measuring valve for cryogenic liquid storage tank and storage tank

Abstract

The filling limiting mechanism comprises a liquid collecting pipe, a detection pipe and a flexible compensation pipe, the liquid collecting pipe is used for being communicated with an inner container of the copious cooling liquid storage tank in a sealed mode, so that the inner end of the liquid collecting pipe is located in the inner container of the copious cooling liquid storage tank, and the detection pipe is used for detecting the filling of the copious cooling liquid storage tank. The outer end of the interlayer is positioned between the inner container and the outer container of the cryogenic liquid storage tank; the detection pipe is arranged outside the outer container of the cryogenic liquid storage tank, one end of the detection pipe is closed and detachably connected with a temperature detector, and the other end of the detection pipe is in closed connection with the outer container of the cryogenic liquid storage tank; and the other end of the flexible compensation pipe penetrates through the outer container of the cryogenic liquid storage tank and is hermetically communicated with one end, far away from the temperature detector, of the detection pipe. The problem that in the filling process of the cryogenic liquid storage tank, the liquid level detection error is large can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of storage and transportation of cryogenic liquids, and in particular to a filling limit mechanism without a fullness measuring valve for a cryogenic liquid storage tank and a cryogenic liquid storage tank; the utility model is particularly suitable for liquid hydrogen, liquid helium, liquid oxygen, liquid nitrogen, liquid argon, LNG, liquid ethylene and the like. Background Art

[0002] Fuel cell vehicles using hydrogen as a medium are an important development direction in the field of new energy vehicles in the future. Hydrogen fuel cell vehicles use hydrogen as a power source, and their advantages include high energy density, short refueling time, long endurance, etc., while achieving zero carbon emissions.

[0003] At present, hydrogen refueling stations mainly use high-pressure hydrogen as the gas source. The density of hydrogen at room temperature under a pressure of 35MPa is about 25kg / m 3 , about 41kg / m at 70MPa pressure 3 , which makes transportation, storage and refueling inefficient, thus affecting the economic efficiency of hydrogen fuel cell vehicles. At the standard boiling point, the density of normal hydrogen is about 71kg / m 3 . The density of hydrogen at standard state is 0.08376kg / m 3 , the gas-liquid ratio reaches about 850 times, and the storage pressure of liquid hydrogen is generally below 1.1MPa. The pressure is low, and the density of liquid hydrogen is greater than that of high-pressure hydrogen. The transportation efficiency of liquid hydrogen is greatly improved. The use of liquid hydrogen refueling can improve the efficiency of hydrogen transportation, storage, and refueling, which is an important direction for the future development of hydrogen energy.

[0004] As a storage and transportation device for liquid hydrogen, liquid hydrogen storage tanks are very important for liquid level detection during the filling process. However, due to the low density of liquid hydrogen, the pressure difference of the liquid level at a height of 1m is only about 0.7KPa. The traditional differential pressure liquid level detection has a large error problem. It is very necessary to set up a device that can quickly detect the liquid level, especially the full liquid level detection, which involves the safety of tank storage. Utility Model Content

[0005] The utility model aims to provide a filling limit mechanism without a fullness measuring valve for a cryogenic liquid storage tank, so as to solve the problem of large liquid level detection error during the filling process of the cryogenic liquid storage tank.

[0006] The utility model is realized by the following technical solutions:

[0007] A filling limit mechanism without a fullness valve for a cryogenic liquid storage tank comprises: a liquid collecting pipe, the liquid collecting pipe is used to be in airtight communication with an inner container of the cryogenic liquid storage tank, so that the inner end of the liquid collecting pipe is located inside the inner container of the cryogenic liquid storage tank, and the outer end is located in the interlayer between the inner container and the outer container of the cryogenic liquid storage tank; a detection tube, the detection tube is arranged on the outside of the outer container of the cryogenic liquid storage tank, one end of the detection tube is airtightly and detachably connected with a temperature detector, and the other end is airtightly connected to the outer container of the cryogenic liquid storage tank; a flexible compensating tube, one end of the flexible compensating tube is in airtight communication with the outer end of the liquid collecting pipe, and the other end passes through the outer container of the cryogenic liquid storage tank and is airtightly connected to an end of the detection tube away from the temperature detector.

[0008] Optionally, the liquid collecting pipe is arranged horizontally.

[0009] Optionally, the liquid collecting pipe is a straight pipe.

[0010] Optionally, the inner end of the collecting tube is warped upward to form a warped section.

[0011] Optionally, the flexible compensating tube coil is arranged on the same horizontal plane and is coplanar with the liquid collecting pipe.

[0012] Optionally, a cold-keeping component is further included, wherein the cold-keeping component covers the portion of the flexible compensation tube located outside the outer container of the cryogenic liquid storage tank and the detection tube.

[0013] Optionally, the cold-insulating component can be fixedly connected to the outer wall of the outer container of the cryogenic liquid storage tank.

[0014] Optionally, a connector is buried in the cold-keeping component, the detection tube is embedded in the cold-keeping component, and is detachably connected to the flexible compensation tube through the connector; the temperature detector is located outside the cold-keeping component.

[0015] A storage tank comprises: an inner tank, the inner tank being used to contain cryogenic liquid; an outer tank, the outer tank being mounted on the outside of the inner tank, with an interlayer reserved between the outer tank and the inner tank; a plurality of filling limit mechanisms without a fullness valve for cryogenic liquid storage tanks as described above, all of the liquid collecting pipes respectively passing through the tank wall of the inner tank and being in airtight communication with the inner tank, all of the detection tubes being arranged on the outside of the outer tank, and all of the flexible compensation tubes being arranged in the interlayer between the inner tank and the outer tank.

[0016] The inner tank is connected to a liquid inlet pipe, which is connected to a cryogenic liquid source. The liquid inlet pipe is provided with a liquid inlet valve. The temperature detector is connected to a control system of the liquid inlet valve to control the opening or closing of the liquid inlet valve.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model provides a filling limit mechanism without a full-valve for a cryogenic liquid storage tank. The filling limit mechanism comprises a liquid collecting pipe, a flexible compensating pipe and a detection pipe which are connected in sequence, and a temperature detector is detachably connected to the detection pipe, and one end of the liquid collecting pipe is extended into the inner container of the cryogenic liquid storage tank. During the process of gradually filling the cryogenic liquid into the cryogenic liquid storage tank, the liquid level gradually rises. When the liquid level is flush with the pipe mouth of the liquid collecting pipe, the cryogenic liquid flows into the liquid collecting pipe and flows along the liquid collecting pipe until it contacts the bottom of the temperature detector. After the temperature detector contacts the cryogenic liquid at low temperature, a sudden change in temperature can be quickly detected, so that it is quickly known that the liquid level of the cryogenic liquid rises to a preset liquid level, and the filling of the cryogenic liquid can be stopped accurately and timely. On this basis, by arranging the flexible compensating pipe, the flexible compensating pipe itself can undergo flexible or elastic deformation within a certain range, so as to compensate for the cold contraction displacement and stress caused by the temperature difference between the cryogenic liquid and the outside world. Through the mutual cooperation of the above-mentioned features, the filling limit mechanism without a full-valve for a cryogenic liquid storage tank can effectively solve the problem of large liquid level detection error during the filling process of the cryogenic liquid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0020] Figure 1 A schematic diagram of a filling limit mechanism without a fullness measuring valve for a cryogenic liquid storage tank provided in Example 1 of the utility model;

[0021] Figure 2 A schematic diagram of a filling limit mechanism without a fullness measuring valve for a cryogenic liquid storage tank provided in Example 2 of the utility model;

[0022] Figure 3 This is a partial schematic diagram of the storage tank provided in Example 3 of the utility model.

[0023] Marks and corresponding parts names in the attached drawings:

[0024] 1-inner tank; 2-outer tank; 10-liquid collecting pipe; 11-warping section; 20-detection tube; 30-temperature detector; 40-flexible compensation tube; 50-cold insulation component; 51-connector. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0026] Example 1

[0027] Please refer to Figure 1 and Figure 2 The embodiment of the utility model provides a filling limit mechanism without a fullness valve for a cryogenic liquid storage tank, comprising: a collecting pipe 10, wherein the collecting pipe 10 is used for being in airtight communication with an inner container of the cryogenic liquid storage tank, so that the inner end of the collecting pipe 10 is located inside the inner container of the cryogenic liquid storage tank, and the outer end is located in the interlayer between the inner container and the outer container of the cryogenic liquid storage tank; a second comprising a detection tube 20, wherein the detection tube 20 is arranged outside the outer container of the cryogenic liquid storage tank, wherein one end of the detection tube 20 is airtightly and detachably connected with a temperature detector 30, and the other end is airtightly connected with the outer container of the cryogenic liquid storage tank; a third comprising a flexible compensating tube 40, wherein one end of the flexible compensating tube 40 is airtightly connected with the outer end of the collecting pipe 10, and the other end passes through the outer container of the cryogenic liquid storage tank and is airtightly connected with an end of the detection tube 20 away from the temperature detector 30.

[0028] The filling limit mechanism without full-valve for cryogenic liquid storage tank provided in the present embodiment is provided with a collecting pipe 10, a flexible compensating pipe 40 and a detection pipe 20 which are connected in sequence, and a temperature detector 30 is detachably connected to the detection pipe 20, and one end of the collecting pipe 10 is extended into the inner container of the cryogenic liquid storage tank. During the process of gradually filling the cryogenic liquid into the cryogenic liquid storage tank, the liquid level gradually rises. When the liquid level is flush with the pipe mouth of the collecting pipe 10, the cryogenic liquid flows into the collecting pipe 10, and flows along the collecting pipe 10 until it contacts with the temperature detector 30. The temperature detector 30 contacts with the low temperature. After the cryogenic liquid comes into contact, the sudden temperature change can be detected quickly, so that it is quickly known that the liquid level of the cryogenic liquid has risen to the preset liquid level, at which time the injection of the cryogenic liquid can be stopped accurately and timely; on this basis, by setting up a flexible compensation tube 40, it itself can undergo flexibly or elastic deformation within a certain range, thereby compensating for the shrinkage displacement and stress caused by the temperature difference between the cryogenic liquid and the outside world; through the mutual cooperation of the above-mentioned characteristics, the filling limit mechanism without a full valve for the cryogenic liquid storage tank can effectively solve the problem of large liquid level detection error during the filling process of the cryogenic liquid storage tank.

[0029] It should be noted that the portion of the detection tube 20 located outside the outer container can be independently cooled by flexible cooling or vacuum cooling.

[0030] Preferably, the bottoms of the liquid collecting pipe 10, the flexible compensating pipe 40 and the detection pipe 20 are at the same level.

[0031] In order to completely prevent unnecessary bubbles from being pressed into the liquid collecting pipe 10 during the process of the cryogenic liquid entering the liquid collecting pipe 10 , which causes the cryogenic liquid to be unable to smoothly contact the temperature detector 30 , the liquid collecting pipe 10 is arranged horizontally.

[0032] In order to shorten the process of the cryogenic liquid and improve the response speed of the temperature detector 30, the liquid collecting pipe 10 is a straight pipe.

[0033] In order to completely prevent the cryogenic liquid from entering the flexible compensation tube 40 and pressuring unnecessary bubbles into the flexible compensation tube 40 , which would result in the cryogenic liquid being unable to smoothly contact the temperature detector 30 , the flexible compensation tube 40 is coiled on the same horizontal plane and is coplanar with the liquid collecting tube 10 .

[0034] In order to keep the discharged cryogenic liquid warm to ensure the accurate response of the temperature detector 30, while minimizing the heat exchange between the cryogenic liquid and the external environment to prevent frost on the detection tube 20, the above-mentioned filling limit mechanism without a full valve for a cryogenic liquid storage tank also includes a cold preservation component 50, which covers the portion of the flexible compensation tube 40 located outside the outer container of the cryogenic liquid storage tank and the detection tube 20.

[0035] In order to structurally fix the detection tube 20 and improve the integrity of the device, the cold-insulating component 50 can be fixedly connected to the outer wall of the outer container of the cryogenic liquid storage tank.

[0036] In order to facilitate the connection of pipelines while ensuring cold preservation, a connector 51 is buried in the cold preservation component 50, the detection tube 20 is embedded in the cold preservation component 50, and is detachably connected to the flexible compensation tube 40 through the connector 51; the temperature detector 30 is located outside the cold preservation component 50.

[0037] It should be noted that the above-mentioned cold insulation component 50 can adopt any one or more of vacuum cold insulation, flexible cold insulation, PIR cold insulation or foam glass cold insulation.

[0038] Example 2

[0039] Please Figure 1 Further reference Figure 2 The embodiment of the utility model provides a filling limit mechanism without a fullness measuring valve for a cryogenic liquid storage tank, which is another form different from the embodiment 1, and the difference lies in:

[0040] The inner end of the collecting pipe 10 is warped upward to form a warped section 11. The top height of the inner end of the collecting pipe 10 is the designed liquid level height, so as to adjust the height of the collecting pipe 10 and weld and fix it to the head or container wall of the inner container at a suitable position.

[0041] Through the above improvements, the liquid reaching the top height of the collecting pipe 10 can also flow downward along the wall of the collecting pipe 10 into the collecting pipe 10, and reach the end of the temperature detection tube 20 through the flexible compensation tube 40, so that the temperature detector 30 can quickly detect the sudden change in temperature.

[0042] Example 3

[0043] Please refer to Examples 1 and 2 for further details. Figure 3 The utility model embodiment provides a storage tank, comprising: an inner tank 1, the inner tank 1 is used to contain cryogenic liquid; the second comprises an outer tank 2, the outer tank 2 is mounted on the outside of the inner tank 1, and an interlayer is reserved between the outer tank 2 and the inner tank 1; the third comprises any one of the above-mentioned filling limit mechanisms without a full valve for cryogenic liquid storage tanks, all of the liquid collecting pipes 10 respectively penetrate the tank wall of the inner tank 1 and are in closed communication with the inner tank 1, all of the detection tubes 20 are arranged on the outside of the outer tank 2, and all of the flexible compensation tubes 40 are arranged in the interlayer between the inner tank 1 and the outer tank 2.

[0044] It should be noted that, in the above-mentioned storage tanks, the number of filling limit mechanisms without full valves for cryogenic liquid storage tanks is determined according to actual usage requirements. For example, when the preset liquid level is only the full liquid level, only one filling limit mechanism without full valves for cryogenic liquid storage tanks can be set; and if there is a need for multiple liquid level height detection, multiple filling limit mechanisms without full valves for cryogenic liquid storage tanks can be set in sequence from bottom to top along the vertical height of the liquid level.

[0045] In order to further improve automation, the inner tank 1 is connected to a liquid inlet pipe, which is connected to a cryogenic liquid source. The liquid inlet pipe is provided with an inlet valve. The temperature detector 30 is connected to the control system of the inlet valve for interlocking control to control the opening or closing of the inlet valve to prevent overfilling of the cryogenic liquid level storage tank and ensure safe operation of the storage tank.

[0046] When the cryogenic liquid is consumed by the back-end system, the liquid level drops. When the low liquid level setting value is reached, the device can be set at the low liquid level height to realize the low liquid level rapid alarm and interlock control. The cryogenic liquid in the collecting pipe 10 and the flexible compensation pipe 40 will also overflow into the storage tank. The temperature at the bottom of the detection tube 20 will rise suddenly. The temperature detector 30 can then alarm the low liquid level, prompting the operator to take measures to replenish the storage tank within a controllable time to ensure that the storage tank can continue to supply liquid and gas to the back-end system before replenishing the liquid, ensuring the continuity of safe production. At the same time, it can also transmit a signal to the control system of the liquid inlet valve to control the liquid inlet valve to open, thereby implementing the continuous infusion of cryogenic liquid.

[0047] It should be noted that the outer wall of the inner tank 1 is paved with a high vacuum multi-layer insulation material. In this embodiment, it is made of an aluminum-plated polyester film and a nylon mesh alternately coated.

[0048] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A filling limit mechanism without a fullness valve for a cryogenic liquid storage tank, characterized in that: include: A liquid collecting pipe (10), the liquid collecting pipe (10) being used for being in airtight communication with the inner container of the cryogenic liquid storage tank, so that the inner end of the liquid collecting pipe (10) is located inside the inner container of the cryogenic liquid storage tank, and the outer end is located in the interlayer between the inner container and the outer container of the cryogenic liquid storage tank; A detection tube (20), the detection tube (20) being arranged outside the outer container of the cryogenic liquid storage tank, one end of the detection tube (20) being sealed and detachably connected to a temperature detector (30), and the other end of the detection tube (20) being sealed and connected to the outer container of the cryogenic liquid storage tank; A flexible compensating tube (40), one end of which is in sealed communication with the outer end of the liquid collecting tube (10), and the other end of which passes through the outer container of the cryogenic liquid storage tank and is in sealed communication with an end of the detection tube (20) away from the temperature detector (30).

2. The filling limit mechanism without a fullness detection valve for a cryogenic liquid storage tank according to claim 1, characterized in that: The liquid collecting pipe (10) is arranged horizontally.

3. The filling limit mechanism without full-valve for cryogenic liquid storage tank according to claim 2 is characterized in that: The liquid collecting pipe (10) is a straight pipe.

4. The filling limit mechanism without a fullness valve for a cryogenic liquid storage tank according to claim 3 is characterized in that: The inner end of the collecting pipe (10) is warped upward to form a warped section (11).

5. The filling limit mechanism without full-valve for cryogenic liquid storage tank according to claim 4, characterized in that: The flexible compensating pipe (40) is arranged on the same horizontal plane and is coplanar with the liquid collecting pipe (10).

6. The filling limit mechanism without a fullness valve for a cryogenic liquid storage tank according to any one of claims 1 to 5, characterized in that: It also includes a cold preservation member (50), wherein the cold preservation member (50) covers the portion of the flexible compensation tube (40) located outside the outer container of the cryogenic liquid storage tank and the detection tube (20).

7. The filling limit mechanism without a fullness detection valve for a cryogenic liquid storage tank according to claim 6, characterized in that: The cold-insulating component (50) can be fixedly connected to the outer wall of the outer container of the cryogenic liquid storage tank.

8. The filling limit mechanism without a fullness detection valve for a cryogenic liquid storage tank according to claim 7, characterized in that: A connector (51) is embedded in the cold preservation component (50), the detection tube (20) is embedded in the cold preservation component (50), and is detachably connected to the flexible compensation tube (40) through the connector (51); The temperature detector (30) is located outside the cold preservation component (50).

9. A storage tank, characterized in that: include: An inner tank (1), the inner tank (1) being used to contain a cryogenic liquid; An outer tank (2), wherein the outer tank (2) is mounted on the outside of the inner tank (1), and an interlayer is reserved between the outer tank (2) and the inner tank (1); A filling limit mechanism without a fullness valve for a cryogenic liquid storage tank as described in any one of claims 1 to 8, wherein all of the liquid collecting pipes (10) respectively penetrate the tank wall of the inner tank (1) and are tightly connected to the inner tank (1), all of the detection tubes (20) are arranged on the outside of the outer tank (2), and all of the flexible compensation tubes (40) are arranged in the interlayer between the inner tank (1) and the outer tank (2).

10. The storage tank according to claim 9, characterized in that The inner tank (1) is connected to a liquid inlet pipe, which is connected to a cryogenic liquid source. The liquid inlet pipe is provided with a liquid inlet valve. The temperature detector (30) is connected to a control system of the liquid inlet valve to control the opening or closing of the liquid inlet valve.

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