Pressure detection device of low-temperature liquid container
By using a combined structure of air sealing pipe and heat exchanger in the low-temperature liquid container, the problems of cooling capacity loss and inaccurate detection in the pressure detection of low-temperature liquid containers are solved, and the accuracy of pressure detection and cooling capacity are achieved.
Patent Information
- Application Number
- CN202422550625.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-10-21
AI Technical Summary
The problem of cold volume loss and inaccurate detection results due to heat exchange reactions during the pressure detection process of low-temperature liquid containers.
The combined structure of the gas sealing pipe and the heat exchanger is adopted. The gas sealing pipe is connected to the pressure port of the container. After the low-temperature liquid enters the gas sealing pipe, it is vaporized into gas through the heat exchanger, and returns to the container to form a stable gas phase space. The pressure detector detects the gas pressure.
The accuracy of pressure detection and the reduction of cooling capacity loss are achieved, and the continuous heat exchange reaction of low-temperature liquids in the pipeline is avoided, which improves the reliability of the detection results.
Smart Images
Figure CN223153322U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pressure detection, and particularly relates to a pressure detection device for a cryogenic liquid container. Background Art
[0002] Cryogenic liquids, such as liquefied natural gas, ethylene, ethane, propylene, liquid hydrogen, liquid nitrogen, etc., have liquefaction temperatures far lower than the ambient temperature under normal pressure. Generally, cryogenic storage tanks are used as containers for storage. Although the containers adopt good cold insulation protection measures, due to the large temperature difference between the cryogenic liquid and the environment, endothermic evaporation may still occur during storage and transportation, and as the heat absorption increases continuously, the storage and transportation pressure will also rise continuously. Therefore, it is necessary to observe the pressure condition of the cryogenic liquid container at all times.
[0003] In the pressure test of a cryogenic liquid container, the conventional pressure taking method is to directly connect a pressure detector to the pressure taking port of the container through a pipeline to measure the pressure at the pressure taking port of the container. However, during transportation, this will allow the cryogenic liquid to enter the pipeline from the pressure taking port and cause continuous heat exchange reactions inside the pipeline and near the pressure taking port. This will condense the water in the ambient air near the pressure taking port and on the pipeline and is also likely to condense into ice blocks, resulting in cold loss; moreover, some cryogenic liquid will vaporize in the pipeline to generate gas, making the gas-liquid coexist in the pipeline and leading to inaccurate detection results. Summary of the Utility Model
[0004] The main purpose of the utility model is to propose a pressure detection device for a cryogenic liquid container, aiming to solve the problems of cold loss caused by the heat exchange reaction of the cryogenic liquid and inaccurate detection results caused by the gas-liquid coexistence in the pipeline.
[0005] To achieve the above purpose, the utility model proposes a pressure detection device for a cryogenic liquid container, and the pressure detection device includes:
[0006] An air-sealing pipe, which is located outside the container, and one end of the air-sealing pipe is communicated with the pressure taking port of the container;
[0007] A heat exchanger, in which a heat exchange channel is formed, and both ends of the heat exchange channel respectively form a first opening and a second opening, and the other end of the air-sealing pipe is communicated with the first opening of the heat exchange channel;
[0008] A pressure detector, which is communicated with the heat exchange channel and closes the second opening. The heat exchanger is used to exchange heat between the cryogenic liquid entering the heat exchange channel from the air-sealing pipe and the external environment, so that the cryogenic liquid in the heat exchange channel is vaporized into gas, and the pressure detector detects the pressure of the gas.
[0009] In one embodiment, the air seal pipe is a pipe with a constant diameter. The air seal pipe includes an annular bending portion and two connecting portions. The two connecting portions are respectively connected to both ends of the annular bending portion, and the ends of the two connecting portions away from the annular bending portion are respectively communicated with the first opening and the pressure tapping port.
[0010] In one embodiment, the annular bending portion spirally winds around at least one week, and the two connecting portions are located on opposite sides of the bending portion.
[0011] In one embodiment, the ends of the two connecting portions away from the annular bending portion both form pipe orifices. The two pipe orifices are respectively communicated with the first opening and the pressure tapping port, and the two pipe orifices are located on the same horizontal plane.
[0012] In one embodiment, the heat exchanger includes:
[0013] A pipe, an equal-diameter heat exchange channel is formed inside the pipe, and both ends of the pipe along its extending direction are a first end and a second end respectively. The first end and the second end respectively form the first opening and the second opening;
[0014] Fins, there are a plurality of the fins, and the plurality of fins are arranged at intervals on the outer wall of the pipe.
[0015] In one embodiment, the plurality of fins are arranged at uniform intervals along the extending direction of the pipe.
[0016] In one embodiment, each of the fins is a circular fin. The inner circumferential sides of the circular fins are all connected to the outer circumferential side of the pipe, and each of the circular fins extends along the radial direction of the pipe.
[0017] In one embodiment, a socket is provided at the first end. One end of the air seal pipe is inserted into the socket and welded to the socket.
[0018] In one embodiment, a lock nut is provided at the second end, and the lock nut is threadedly connected to the joint of the pressure detector.
[0019] In one embodiment, the socket, the lock nut and the pipe are integrally formed.
[0020] In the pressure detection device of the cryogenic liquid container of the present utility model, by adopting a gas sealing pipe and a heat exchanger, wherein one end of the gas sealing pipe is communicated with the pressure taking port of the container, and the other end of the gas sealing pipe is communicated with the first opening of the heat exchange channel, so that the cryogenic liquid stored in the container can enter the gas sealing pipe and enter the heat exchange channel from the gas sealing pipe. Through the heat exchanger, the cryogenic liquid entering the heat exchange channel can be heat-exchanged with the external environment and thus vaporized into a gas. After the cryogenic liquid is vaporized into a gas, its volume expands and becomes larger, so that the cryogenic liquid is pressed back into the container in the reverse direction, and the liquid no longer enters the gas sealing pipe from the pressure taking port, enabling the gas sealing pipe to play a gas sealing role; and a stable state is formed at the gas sealing pipe, thereby achieving pressure balance, and a stable gas phase space is formed in the gas sealing pipe and the heat exchange channel. The pressure detector is communicated with the second opening of the heat exchange channel, and the measured gas pressure is equivalent to the pressure at the pressure taking port of the container, and the detection result is more accurate; and it also avoids the continuous heat exchange of the cryogenic liquid entering the gas sealing pipe from the pressure taking port, reducing the cold quantity loss. Brief Description of the Drawings
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.
[0022] Figure 1 It is a schematic structural diagram of an embodiment of the pressure detection device provided by the present utility model.
[0023] Explanation of the reference numerals in the drawings:
[0024] 100, pressure detection device; 1, gas sealing pipe; 11, annular bending part; 12, connecting part; 121, pipe orifice; 2, heat exchanger; 21, pipeline; 211, first end; 2111, first opening; 212, second end; 2121, second opening; 213, heat exchange channel; 22, fin; 23, socket; 24, lock nut; 3, pressure detector.
[0025] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments
[0026] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0027] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0029] Cryogenic liquids, such as liquefied natural gas, ethylene, ethane, propylene, liquid hydrogen, liquid nitrogen, etc., have liquefaction temperatures far lower than the ambient temperature under normal pressure. Generally, cryogenic storage tanks are used as containers for storage. Although good cold insulation protection measures are taken for the containers, due to the large temperature difference between the cryogenic liquids and the environment, heat absorption and evaporation may still occur during storage and transportation, and as the heat absorption increases continuously, the storage and transportation pressure will also rise continuously. Therefore, it is necessary to observe the pressure condition of the cryogenic liquid container at all times.
[0030] In the pressure test of a cryogenic liquid container, the conventional pressure-taking method is to directly connect a pressure detector to the pressure-taking port of the container through a pipeline to measure the pressure at the pressure-taking port of the container. However, during transportation, this will allow the cryogenic liquid to enter the pipeline from the pressure-taking port, and continuous heat exchange reactions will occur inside the pipeline and near the pressure-taking port. This will condense the water in the ambient air near the pressure-taking port and on the pipeline, and it is also easy to condense into ice cubes, resulting in cold loss. Moreover, some cryogenic liquids will vaporize to generate gas inside the pipeline, causing a gas-liquid coexistence inside the pipeline and resulting in inaccurate detection results.
[0031] The present utility model provides a pressure detection device 100 for a cryogenic liquid container.
[0032] Please refer to Figure 1 , in an embodiment of the present utility model, the pressure detection device 100 includes a gas seal pipe 1, a heat exchanger 2, and a pressure detector 3; the gas seal pipe 1 is located outside the container, and one end of the gas seal pipe 1 is connected to the container; a heat exchange channel 213 is formed inside the heat exchanger 2, and two ends of the heat exchange channel 213 respectively form a first opening 2111 and a second opening 2121, and the other end of the gas seal pipe 1 is connected to the first opening 2111 of the heat exchange channel 213; the pressure detector 3 is connected to the heat exchange channel 213 and closes the second opening 2121, and the heat exchanger 2 is used to exchange heat between the cryogenic liquid entering the heat exchange channel 213 from the gas seal pipe 1 and the external environment, so that the cryogenic liquid in the heat exchange channel 213 is vaporized into gas, and the pressure detector 3 detects the pressure of the gas.
[0033] The technical solution of the present utility model adopts the gas seal pipe 1 and the heat exchanger 2. Among them, one end of the gas seal pipe 1 is connected to the pressure-taking port of the container, and the other end of the gas seal pipe 1 is connected to the first opening 2111 of the heat exchange channel 213, so that the cryogenic liquid stored in the container can enter the gas seal pipe 1 and enter the heat exchange channel 213 from the gas seal pipe 1. Through the heat exchanger 2, the cryogenic liquid entering the heat exchange channel 213 can be exchanged with the external environment, and thus vaporized into gas. After the cryogenic liquid vaporizes into gas, its volume expands and becomes larger, so that the cryogenic liquid is reversely pressed back into the container, so that the liquid no longer enters the gas seal pipe 1 from the pressure-taking port, making the gas seal pipe 1 play a gas seal role; and a stable state is formed at the gas seal pipe 1, so as to achieve pressure balance, and a stable gas phase space is formed inside the gas seal pipe 1 and the heat exchange channel 213. The pressure detector 3 is connected to the second opening 2121 of the heat exchange channel 213, and the measured gas pressure is equivalent to the pressure at the pressure-taking port of the container, and the detection result is more accurate; and it also avoids the continuous heat exchange of the cryogenic liquid entering the gas seal pipe 1 from the pressure-taking port, reducing the cold loss.
[0034] It should be noted that the container can adopt a cryogenic liquid storage tank in the prior art, and the pressure tapping port can be set at any position of the container, so as to detect the pressure at different positions through the pressure detection device 100; therefore, the pressure detection device 100 can also be applied to the liquid level measurement of cryogenic liquid in the container, and the liquid static pressure brought by the cryogenic liquid is reflected by testing the pressure difference between the bottom and the top of the container, and this liquid static pressure is related to the height of the cryogenic liquid.
[0035] In one embodiment, the gas sealing pipe 1 is a pipe with a constant diameter. The gas sealing pipe 1 includes an annular bending part 11 and two connecting parts 12. The two connecting parts 12 are respectively connected to both ends of the annular bending part 11, and the ends of the two connecting parts 12 away from the annular bending part 11 are respectively communicated with the first opening 2111 and the pressure tapping port.
[0036] It can be understood that since the gas sealing pipe 1 is a pipe with a constant diameter, the internal diameter of the whole gas sealing pipe 1 remains consistent, ensuring that the cryogenic liquid flows and the gas obtained after its vaporization is more uniform, reducing the pressure loss or flow rate change caused by the diameter change, and remaining stable, thereby improving the pressure measurement accuracy. Among them, the design of the annular bending part 11 can effectively reduce the eddy current phenomenon generated when the cryogenic liquid or gas passes through, contribute to maintaining the gas balance inside it, and improve the measurement accuracy.
[0037] In one embodiment, the annular bending part 11 spirally winds around at least one week, and the two connecting parts 12 are located on opposite sides of the bending part.
[0038] It can be understood that the annular bending part 11 spirally winds around at least one week. Compared with the straight pipe design, the spiral winding structure can provide a longer flow path in a smaller space, reduce the space occupation, and increase the flow path length inside the gas sealing pipe 1, which helps the gas to remain stable, reduces the gas pressure fluctuation, and is thus beneficial to improving the measurement accuracy; and the spiral winding structure can also make the gas sealing pipe 1 more firm when subjected to external impact or vibration, not easily deformed or damaged, and thus extend the service life.
[0039] In other embodiments, the annular bending part 11 can spiral around two weeks, three weeks, etc., which is not limited herein.
[0040] In one embodiment, the ends of the two connecting parts 12 away from the annular bending part 11 both form pipe orifices 121. The two pipe orifices 121 are respectively communicated with the first opening 2111 and the pressure tapping port, and the two pipe orifices 121 are located on the same horizontal plane.
[0041] It can be understood that since the two pipe orifices 121 are located on the same horizontal plane, this helps to reduce the pressure difference caused by the height difference and ensure that the measured pressure value is more accurate and stable.
[0042] In one embodiment, the heat exchanger 2 includes a pipe 21 and fins 22. An equal-diameter heat exchange channel 213 is formed inside the pipe 21. The two ends of the pipe 21 along its extending direction are respectively a first end 211 and a second end 212. A first opening 2111 and a second opening 2121 are respectively formed at the first end 211 and the second end 212. There are multiple fins 22, and the multiple fins 22 are arranged at intervals on the outer wall of the pipe 21.
[0043] It can be understood that the equal-diameter setting of the heat exchange channel 213 ensures the uniform distribution of the fluid in the heat exchange channel 213, thereby improving the heat exchange efficiency. The multiple fins 22 are arranged at intervals on the outer wall of the pipe 21, increasing the heat exchange area and enabling the fluid in the heat exchange channel 213 to exchange heat with the surrounding environment evenly, improving the uniformity and efficiency of heat exchange.
[0044] Furthermore, the pipe 21 is an equal-diameter pipe 21.
[0045] Furthermore, each fin 22 and the pipe 21 are integrally formed, with a stable structure and better sealing performance.
[0046] In one embodiment, the multiple fins 22 are arranged at equal intervals along the extending direction of the pipe 21. It can be understood that the multiple fins 22 are arranged at intervals along the extending direction of the pipe 21. Such an arrangement allows for a larger number of fins 22, and the contact surface between the fins 22 and the pipe 21 is wider, thus enabling faster and better heat exchange efficiency.
[0047] In another embodiment, the multiple fins 22 are arranged at equal intervals along the circumferential direction of the pipe 21. It can be understood that the distance between the parts of two adjacent fins 22 away from the pipe 21 is larger. Therefore, such an arrangement makes it less likely for the fins 22 to affect each other, and the air flow outside is better, with high heat exchange efficiency.
[0048] In one embodiment, each fin 22 is a circular ring fin. The inner circumferential side of each circular ring fin is connected to the outer circumferential side of the pipe 21, and each circular ring fin extends along the radial direction of the pipe 21.
[0049] It can be understood that the shape of the circular ring fin enables the heat from the external environment to be evenly transferred from the fin 22 to the inside of the pipe 21 for heat exchange with the low-temperature liquid, ensuring the uniformity of heat transfer. The circular ring fin extends along the radial direction of the pipe 21, greatly increasing the heat exchange surface area, thereby significantly improving the heat exchange efficiency. The inner circumferential side of the circular ring fin is firmly connected to the outer circumferential side of the pipe 21, enhancing the overall structural stability of the heat exchanger 2. This connection method can withstand higher mechanical stresses, ensuring that the heat exchanger 2 maintains good performance.
[0050] In one embodiment, a socket 23 is provided at the first end 211. One end of the air seal pipe 1 is inserted into the socket 23 and welded to the socket 23.
[0051] Understandably, by providing the socket joint 23 at the first end 211, one end of the air seal tube 1 is inserted into the socket joint 23 and then communicated with the heat exchange channel 213. Moreover, the socket joint 23 is welded to the air seal tube 1, thereby ensuring the tightness between the air seal tube 1 and the socket joint 23, preventing the gas obtained from the vaporization of the cryogenic liquid from overflowing, and the welding method makes the structure more stable.
[0052] Among them, the socket joint 23 is circular ring-shaped and has an insertion port communicated with the heat exchange channel 213, so that one end of the air seal tube 1 can be partially inserted into the insertion port and then communicated with the heat exchange channel 213, enabling the socket joint 23 to be sleeved on the air seal tube 1, and then welded to ensure the tightness between the two.
[0053] In one embodiment, the air seal tube 1, the pipeline 21 and the fins 22 are all made of stainless steel material, making the structure more firm, having a long service life and being resistant to low-temperature environments.
[0054] In one embodiment, a lock nut 24 is provided at the second end 212, and the lock nut 24 is threadedly connected to the joint of the pressure detector 3.
[0055] Understandably, by providing the lock nut 24 threadedly connected to the joint of the pressure detector 3, the structure is firm, and it is easy to disassemble and install. At the same time, the threaded connection also has strong tightness to prevent gas leakage, so as to improve the accuracy of the detection result.
[0056] In one embodiment, the socket joint 23, the lock nut 24 and the pipeline 21 are integrally formed.
[0057] Understandably, through the integral forming process, the socket joint 23, the lock nut 24 and the pipeline 21 are integrally prepared, making the connecting part 12 more firm, capable of withstanding higher mechanical stress, improving the strength and durability of the overall structure, and having better tightness, reducing the risk of gas leakage; at the same time, the integral forming process reduces the assembly steps of the socket joint 23, the lock nut 24 and the pipeline 21, simplifies the manufacturing and assembly processes, not only improves the production efficiency, but also reduces the production cost.
[0058] Furthermore, the pressure detector 3 adopts a pressure transmitter or a pressure gauge in the prior art.
[0059] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.
Claims
1. A pressure detection device for a cryogenic liquid container, characterized in that The pressure detection device (100) includes: An air seal pipe (1), the air seal pipe (1) is located outside the container, and one end of the air seal pipe (1) is communicated with the pressure taking port of the container; A heat exchanger (2), a heat exchange channel (213) is formed in the heat exchanger (2), both ends of the heat exchange channel (213) respectively form a first opening (2111) and a second opening (2121), and the other end of the air seal pipe (1) is communicated with the first opening (2111) of the heat exchange channel (213); A pressure detector (3), the pressure detector (3) is communicated with the heat exchange channel (213) and closes the second opening (2121), the heat exchanger (2) is used for exchanging heat between the cryogenic liquid entering the heat exchange channel (213) from the air seal pipe (1) and the external environment, so that the cryogenic liquid in the heat exchange channel (213) is vaporized into a gas, and the pressure detector (3) detects the pressure of the gas.
2. The pressure detection device for a cryogenic liquid container according to claim 1, wherein The air seal pipe (1) is a pipe with equal diameter, the air seal pipe (1) includes an annular bending part (11) and two connecting parts (12), the two connecting parts (12) are respectively connected to both ends of the annular bending part (11), and the ends of the two connecting parts (12) far away from the annular bending part (11) are respectively communicated with the first opening (2111) and the pressure taking port.
3. The pressure detection device for a cryogenic liquid container according to claim 2, wherein The annular bending part (11) spirally winds around at least one week, and the two connecting parts (12) are located on opposite sides of the bending part.
4. The pressure detection device for a cryogenic liquid container according to claim 2, characterized in that, Both ends of the two connecting parts (12) far away from the annular bending part (11) form pipe orifices (121), the two pipe orifices (121) are respectively communicated with the first opening (2111) and the pressure taking port, and the two pipe orifices (121) are located on the same horizontal plane.
5. The pressure detection device for a cryogenic liquid container according to any one of claims 1 to 4, characterized in that The heat exchanger (2) includes: A pipe (21), an equal-diameter heat exchange channel (213) is formed in the pipe (21), and both ends of the pipe (21) along its extending direction are respectively a first end (211) and a second end (212), the first end (211) and the second end (212) respectively form the first opening (2111) and the second opening (2121); Fins (22), there are a plurality of the fins (22), and the plurality of fins (22) are arranged at intervals on the outer wall of the pipe (21).
6. The pressure detection device for a cryogenic liquid container according to claim 5, characterized in that, The plurality of fins (22) are arranged at equal intervals along the extending direction of the pipe (21).
7. The pressure detection device for a cryogenic liquid container according to claim 5, characterized in that, Each of the fins (22) is a circular fin, the inner peripheral side of each circular fin is connected to the outer peripheral side of the pipe (21), and each circular fin extends along the radial direction of the pipe (21).
8. The pressure detection device for a cryogenic liquid container according to claim 5, wherein, The first end (211) is provided with a socket (23), and one end of the air seal pipe (1) is inserted into the socket (23) and welded to the socket (23).
9. The pressure detection device for a cryogenic liquid container according to claim 8, wherein, The second end (212) is provided with a lock nut (24), and the lock nut (24) is threadedly connected to the joint of the pressure detector (3).
10. The pressure detection device for a cryogenic liquid container according to claim 9, characterized in that, The socket joint (23), the locknut (24), and the pipe (21) are integrally formed.