Precooling system

Abstract

The embodiment of the present invention relates to the field of precooling technology for low-temperature systems, and the precooling system provided includes: a medium source system, a transmission pipeline, a first refrigeration device and a precooling sleeve, wherein the medium source system is connected to the transmission pipeline, the first refrigeration device is connected to the medium source system and the precooling sleeve, and the precooling sleeve is thermally coupled to the transmission pipeline. The precooling system provided by the embodiment of the present invention solves the problem of consuming medium source medium in the existing open precooling system technology by setting a precooling circuit, and also solves the problem of high manufacturing cost in the existing closed precooling system technology. At the same time, during the process of the medium source system supplying the medium, the precooling circuit can continue to connect to the refrigeration system to keep the transmission pipeline warm, solving the problem of temperature rise during the medium transmission process. The precooling system provided by the embodiment of the present invention does not need to consume the user's gas source additionally, saving production costs.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature system precooling, and in particular to a precooling system. Background Art

[0002] In low-temperature system experiments and applications, the initial state of the system is generally at room temperature. Before conducting low-temperature experiments, the system needs to be cooled to the experimental temperature. Especially in the low-temperature medium source supply system, in order to ensure the safety of the system and avoid excessive pipeline stress caused by the impact of low-temperature medium on the room temperature pipeline, and to avoid the temperature rise of the prepared low-temperature medium that meets the use requirements when it is transported to the user end, affecting the use, the system pipeline must be pre-cooled before the system is used. The pre-cooling operation of the system pipeline directly affects the safety of the system, and also affects whether the system can ultimately meet the user's requirements.

[0003] At present, there are two methods for precooling the low-temperature medium source system: open precooling and closed precooling. Open precooling means that a part of the prepared low-temperature medium is reserved for precooling the system pipeline separately, and the precooled medium is recycled and processed separately. This is an open system. The open precooling method consumes a large amount of medium source medium, so that the preparation amount of medium source medium is significantly higher than the actual demand of users, and resource consumption increases. At the same time, the refrigeration time cost and labor cost will increase. In particular, when the system output is not large, it will not be able to meet the consumption requirements of the precooling system.

[0004] Closed precooling refers to the use of prepared low-temperature media to precool the system pipelines, and the precooled medium is sent back to the original medium source, and then cooled again to meet user needs. The closed precooling method requires adding a separate cryogenic pump and corresponding cryogenic valves to the original system, which will increase the complexity of the system and significantly increase the manufacturing cost of the system. And if the system medium is a high-pressure medium and the refrigeration system is a low-pressure system, the high-pressure part and the low-pressure part of the system are not independent. In addition, the re-cooling of the reflux medium requires additional resources, which also increases various costs such as time and manpower.

[0005] Therefore, providing a new precooling system has become an urgent problem to be solved in the industry. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, an embodiment of the present invention provides a precooling system.

[0007] The precooling system provided in an embodiment of the present invention includes: a medium source system, a transmission pipeline, a first refrigeration device and a precooling sleeve, wherein the medium source system is connected to the transmission pipeline, the first refrigeration device is connected to the medium source system and the precooling sleeve, and the precooling sleeve is thermally coupled to the transmission pipeline.

[0008] According to one embodiment of the present invention, the first pipeline and the second pipeline of the first refrigeration device are respectively connected to the medium source system to form a refrigeration circuit with the medium source system, the third pipeline of the first refrigeration device is connected to the first end of the precooling sleeve and the fourth pipeline is connected to the second end of the precooling sleeve to form a precooling circuit with the precooling sleeve.

[0009] According to one embodiment of the present invention, the pre-cooling sleeve is sleeved on the transmission pipeline.

[0010] According to an embodiment of the present invention, it further comprises a circuit switching device, wherein the circuit switching device is configured to enable the first refrigeration device to switch between the refrigeration circuit and the pre-cooling circuit.

[0011] According to one embodiment of the present invention, the circuit switching device includes stop valves, and the stop valves are respectively located on the first pipeline and the third pipeline.

[0012] According to an embodiment of the present invention, the first pipeline and the third pipeline are cooling pipelines, and the second pipeline and the fourth pipeline are cooling return pipelines.

[0013] According to one embodiment of the present invention, it further includes a second refrigeration device, and the second refrigeration device is connected to the medium source system.

[0014] According to one embodiment of the present invention, the second refrigeration device is connected to the medium source system through a fifth pipeline and a sixth pipeline to form a refrigeration circuit with the medium source system, wherein the fifth pipeline is a cooling pipeline and the sixth pipeline is a cooling return pipeline.

[0015] According to one embodiment of the present invention, the first end of the transmission pipeline is connected to the medium source system, and the second end is connected to an external user end.

[0016] According to an embodiment of the present invention, the medium source system contains a first medium, the first refrigeration device and the second refrigeration device contain a second medium, and the temperature of the second medium is lower than the temperature of the first medium.

[0017] The precooling system provided in the embodiment of the present invention precools and insulates the transmission pipeline by setting a precooling loop, thereby solving the problem of consuming the medium source medium in the existing open precooling system technology, and also solving the problem of high manufacturing cost in the existing closed precooling system technology. At the same time, during the process of the medium source system supplying the medium, the precooling loop can continue to connect to the refrigeration system to insulate the transmission pipeline, solving the problem of temperature rise during the medium transmission process. The precooling system provided in the embodiment of the present invention does not need to consume the user's gas source additionally, saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a precooling system provided in an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1- medium source system; 2- second refrigeration device; 3- first refrigeration device;

[0022] 4-external user end; 5-transmission pipeline; 6-precooling sleeve;

[0023] 7-first pipeline; 8-second pipeline; 9-third pipeline;

[0024] 10- fourth pipeline; 11- stop valve; 12- fifth pipeline;

[0025] 13-Sixth pipeline. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more, and "several", "several roots", and "several groups" mean one or more.

[0029] Now refer to Figure 1 , the embodiments provided by the present invention are described. It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0030] Figure 1 The schematic diagram of the structure of the precooling system provided by the embodiment of the present invention. Figure 1 As shown, the precooling system provided by an embodiment of the present invention includes: a medium source system 1, a transmission pipeline 5, a first refrigeration device 3 and a precooling sleeve 6, wherein the medium source system 1 is connected to the transmission pipeline 5, the first refrigeration device 3 is connected to the medium source system 1 and the precooling sleeve 6, and the precooling sleeve 6 is thermally coupled to the transmission pipeline 5.

[0031] Specifically, the medium source system 1 contains a first medium, one end of the transmission pipeline 5 is connected to the medium source system 1, and the other end is connected to the external user end 4, for transporting the first medium contained in the medium source system 1 to the external user end 4. Further, in one embodiment of the present invention, the first medium is a low-temperature medium, which can be one of a liquid, a gas, or a gas-liquid mixed state.

[0032] The first refrigeration device 3 is connected to the medium source system 1 and the pre-cooling sleeve 6. Figure 1 The first refrigeration device 3 contains a second medium, and the temperature of the second medium is lower than that of the first medium, so that the first refrigeration device 3 can provide cooling for the medium source system 1. Furthermore, in one embodiment of the present invention, the second medium is also a low-temperature medium, which can be a liquid, a gas, or a gas-liquid mixed state.

[0033] The first pipeline 7 of the first refrigeration device 3 is a cooling pipeline connected to the medium source system 1, and is used to input the second medium into the medium source system 1. The second pipeline 8 is a cooling return pipeline, which is also connected to the medium source system 1 and is used to return the low-temperature medium contained in the medium source system 1 to the first refrigeration device 3. The first pipeline 7 and the second pipeline 8 of the first refrigeration device 3 and the medium source system 1 form a refrigeration circuit.

[0034] Continue to refer to Figure 1 The third pipeline 9 of the first refrigeration device 3 is a cooling pipeline connected to the first end of the precooling sleeve 6, and is used to transmit the second medium to the precooling sleeve 6, so as to precool and keep warm the transmission pipeline 5 arranged in the precooling sleeve 6. The fourth pipeline 10 of the first refrigeration device 3 is a return cooling pipeline, which is connected to the second end of the precooling sleeve 6, and is used to return the second medium to the first refrigeration device 3. The third pipeline 9 and the fourth pipeline 10 of the first refrigeration device 3 and the precooling sleeve 6 form a precooling circuit.

[0035] In one embodiment of the present invention, the precooling sleeve 6 is thermally coupled to the transmission pipeline 5. Specifically, in an optional embodiment, the precooling sleeve 6 and the transmission pipeline 5 are arranged adjacent to each other so as to achieve heat exchange between the two. Figure 1 As shown, in one embodiment of the present invention, the precooling sleeve 6 is sleeved on the outside of the transmission pipeline 5, and is used to precool the transmission pipeline 5 to reduce the temperature of the transmission pipeline 5, and at the same time, to keep the transmission pipeline 5 warm when the transmission pipeline 5 transmits the first medium, so that in the process of transporting the first medium, the first medium is prevented from generating an unacceptable temperature rise, and at the same time, the first medium is prevented from causing stress impact on the transmission pipeline 5 due to the low temperature, thereby damaging the transmission pipeline 5.

[0036] In the present invention, the arrangement of the precooling sleeve 6 and the transmission pipeline 5 is not limited to the arrangement described in the embodiment of the present invention, but any arrangement that can satisfy the heat exchange function between the precooling sleeve 6 and the transmission pipeline 5 belongs to the protection scope of the present invention.

[0037] The precooling system provided in the embodiment of the present invention precools and insulates the transmission pipeline by setting a precooling loop, thereby solving the problem of consuming the medium source medium in the existing open precooling system technology, and also solving the problem of high manufacturing cost in the existing closed precooling system technology. At the same time, during the process of the medium source system supplying the medium, the precooling loop can continue to connect to the refrigeration system to insulate the transmission pipeline, solving the problem of temperature rise during the medium transmission process. The precooling system provided in the embodiment of the present invention does not need to consume the user's gas source additionally, saving production costs.

[0038] The precooling system provided in the embodiment of the present invention further includes a circuit switching device, which is configured to enable the first refrigeration device 3 to switch between a refrigeration circuit and a precooling circuit.

[0039] Specifically, the circuit switching device includes a stop valve 11. Figure 1 The stop valve 11 is located on the first pipeline 7 and the third pipeline 9 of the first refrigeration device 3, and is used to switch the first refrigeration device 3 between the refrigeration circuit and the pre-cooling circuit. It should be understood that the above is only one embodiment of the present invention; in other embodiments, a three-way valve can also be set at the branch point of the first pipeline 7 and the third pipeline 9 to switch the first refrigeration device 3 between the refrigeration circuit and the pre-cooling circuit. Any component arrangement that can meet the pipeline switching function belongs to the protection scope of the present invention, and is not limited to the above.

[0040] Specifically, in the gas source preparation stage, the stop valve 11 on the first pipeline 7 is opened, and the stop valve 11 on the third pipeline 9 is closed. The second medium contained in the first refrigeration device 3 enters the medium source system 1 through the first pipeline 7 to provide cooling for the medium source system 1. When the temperature of the first medium contained in the medium source system 1 reaches the preset temperature, the stop valve 11 on the first pipeline 7 is closed, and the stop valve 11 on the third pipeline 9 is opened, and the cooling circuit of the first refrigeration device 3 is switched to the precooling circuit. At this time, the first refrigeration device 3 starts to precool the transmission pipeline 5, and the second medium enters the precooling sleeve 6 sleeved on the outside of the transmission pipeline 5 through the third pipeline 9, so that the temperature of the transmission pipeline 5 reaches the same temperature as the first medium contained in the medium source system 1. During the gas supply stage, when the first medium is transmitted from the medium source system 1 to the external user end 4 through the transmission pipeline 5, the stop valve 11 on the first pipeline 7 is still closed, and the stop valve 11 on the third pipeline 9 is opened, so that the first refrigeration device 3 continues to supply cooling to the transmission pipeline 5 to keep the temperature of the transmission pipeline 5 constant, thereby avoiding unacceptable temperature rise of the first medium during the transmission process.

[0041] In one embodiment of the present invention, the second refrigeration device 2 contains a second medium, which is also used to provide cooling for the medium source system 1. Figure 1 The fifth pipeline 12 of the second refrigeration device 2 is a cooling pipeline connected to the medium source system 1, and the sixth pipeline 13 is a cooling return pipeline also connected to the medium source system 1. The fifth pipeline 12, the sixth pipeline 13 and the medium source system 1 form a refrigeration circuit.

[0042] Furthermore, in the gas source preparation stage, the fifth pipeline 12 of the second refrigeration device 2 is a cooling pipeline, connected to the medium source system 1, and used to continuously input the second medium into the medium source system 1, and the sixth pipeline 13 is a cooling pipeline, also connected to the medium source system 1, and used to return the low-temperature medium in the medium source system 1 to the second refrigeration device 2. When the temperature of the first medium contained in the medium source system 1 reaches the preset temperature, in order to prevent the medium source system 1 from generating a temperature rise at room temperature, the second refrigeration device 2 continues to supply cooling to the medium source system 1.

[0043] The following specific examples are given to explain in detail the working principle of the precooling system provided by the embodiment of the present invention.

[0044] In the following embodiments, the first medium is 20K, 35Mpa helium and the second medium is 16K, 2Mpa helium.

[0045] Reference Figure 1 ,like Figure 1 The entire system shown has completed the preliminary purification work, and the system is at room temperature 300K.

[0046] First, prepare the gas source. Turn on the first refrigeration device 3 and the second refrigeration device 2, open the stop valve 11 on the first pipeline 7 in the first refrigeration device 3, and close the stop valve 11 on the third pipeline 9. At this time, the first refrigeration device 3 and the second refrigeration device 2 begin to cool the medium source system 1 until the temperature of the first medium contained in the medium source system 1 reaches 20K and the pressure reaches 35Mpa. Since the temperature of the second medium contained in the first refrigeration device 3 and the second refrigeration device 2 is lower than the temperature of the first medium contained in the medium source system 1, the first medium can be kept at a constant temperature under the continuous action of the second medium.

[0047] Next, the transmission pipeline 5 is precooled. When the temperature of the first medium contained in the medium source system 1 reaches 20K and the pressure reaches 35Mpa, the second refrigeration device 2 continues to provide cooling for the medium source system 1. At this time, the stop valve 11 on the first pipeline 7 in the first refrigeration device 3 is closed, and the stop valve 11 on the third pipeline 9 is opened, and the refrigeration circuit of the first refrigeration device 3 is switched to the precooling circuit. At this time, the second medium contained in the first refrigeration device 3 enters the precooling sleeve 6 through the third pipeline 9, and starts to precool the transmission pipeline 5 until the temperature in the transmission pipeline 5 reaches 20K.

[0048] Finally, gas supply starts. The valve on the medium source system 1 is opened to start supplying gas to the external user end 4, and the 20K, 35Mpa helium gas flows through the transmission pipeline 5 to the external user end 4. In this process, the stop valve 11 on the first pipeline 7 in the first refrigeration device 3 is in a closed state, and the stop valve 11 on the third pipeline 9 is in an open state, so that the first refrigeration device 3 can continue to supply cooling to the pre-cooling sleeve 6, thereby achieving heat preservation of the transmission pipeline 5.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A precooling system, characterized in that: include: Medium source system, transmission pipeline, first refrigeration device, second refrigeration device, precooling sleeve and circuit switching device, Wherein, the medium source system is connected to the transmission pipeline, the first refrigeration device is connected to the medium source system and the precooling sleeve, the precooling sleeve is thermally coupled to the transmission pipeline, and the second refrigeration device is connected to the medium source system; The medium source system contains a first medium, the first refrigeration device and the second refrigeration device contain a second medium, and the temperature of the second medium is lower than the temperature of the first medium; The first pipeline and the second pipeline of the first refrigeration device are respectively connected to the medium source system to form a refrigeration loop with the medium source system, the third pipeline of the first refrigeration device is connected to the first end of the precooling sleeve and the fourth pipeline is connected to the second end of the precooling sleeve to form a precooling loop with the precooling sleeve; The circuit switching device is configured to switch the first refrigeration device between the refrigeration circuit and the pre-cooling circuit.

2. The precooling system according to claim 1, characterized in that: The precooling sleeve is sleeved on the transmission pipeline.

3. The precooling system according to claim 1, characterized in that: The circuit switching device includes stop valves, which are respectively located on the first pipeline and the third pipeline.

4. The precooling system according to claim 1, characterized in that: The first pipeline and the third pipeline are cooling pipelines, and the second pipeline and the fourth pipeline are cooling return pipelines.

5. The precooling system according to claim 1, characterized in that: The second refrigeration device is connected to the medium source system through a fifth pipeline and a sixth pipeline to form a refrigeration loop with the medium source system, wherein the fifth pipeline is a cooling pipeline and the sixth pipeline is a cooling return pipeline.

6. The precooling system according to claim 1, characterized in that: The first end of the transmission pipeline is connected to the medium source system, and the second end is connected to an external user end.

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