Medium-pressure liquid argon heat exchange device
The four-heat exchanger grouping design and reversing valve switching pipeline are used to solve the problems of liquid argon leakage and insufficient cold recovery efficiency of the medium-pressure argon heat exchanger, achieve system flexibility and stability, reduce the risk of liquid argon leakage, and improve production continuity and economic benefits.
Patent Information
- Application Number
- CN202422585475.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing medium-pressure argon heat exchanger design has problems such as liquid argon leakage risk, poor production continuity and insufficient cold recovery efficiency. In particular, the system is unstable when the liquid argon supply is interrupted.
The system adopts a group design of four heat exchangers and switches the pipeline through a reversing valve to ensure continuous heat exchange of the contaminated nitrogen gas when the liquid argon supply is interrupted, thus achieving system flexibility and stability and improving the cooling recovery efficiency.
It improves the flexibility and stability of the system, reduces the risk of liquid argon leakage, enhances production continuity and economic benefits, and optimizes the production process.
Smart Images
Figure CN223400208U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchange devices, in particular to a medium-pressure liquid argon heat exchange device. Background Art
[0002] Large-scale air separation units (ASUs) play a vital role in modern industrial gas separation technology, particularly in gas separation and recovery. The generation and utilization of contaminated nitrogen (N2) is a critical step in current air separation processes. Contaminated nitrogen refers to nitrogen that does not meet purity requirements during the air separation process and contains a certain proportion of oxygen, argon, and other impurities. In cryogenic distillation processes, contaminated N2 is often recycled and reused as a cooling source to improve the energy efficiency of the entire system.
[0003] However, the current compressed argon heat exchanger only has two channels between the cold source liquid argon and the hot source air, using a reheating and recooling design. This design has exposed some shortcomings in operation. First, the connection method of the hot source air pipeline limits the flexibility of the system and easily leads to liquid argon leakage, which in turn affects production continuity. Second, the heat exchanger's cooling capacity is only 700NM 3 / H, the recovery efficiency is significantly insufficient and the cooling potential of the contaminated nitrogen gas is not fully utilized. Utility Model Content
[0004] The purpose of the present utility model is to provide a medium-pressure liquid argon heat exchange device to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a medium-pressure liquid argon heat exchange device, comprising a box body, a first heat exchanger is provided at one end of the internal front end of the box body, a first heat exchange tube is provided inside the first heat exchanger, a second heat exchanger is provided at the other end of the internal front end of the box body, a second heat exchange tube is provided inside the second heat exchanger, and the second heat exchanger is connected to the first heat exchanger through a third pipe, a third heat exchanger is provided at one end of the internal rear end of the box body, a third heat exchange tube is provided inside the third heat exchanger, a fourth heat exchanger is provided at the other end of the internal rear end of the box body, a fourth heat exchange tube is provided inside the fourth heat exchanger, and the fourth heat exchanger is connected to the third heat exchanger through a seventh pipe.
[0006] When using a medium-pressure liquid argon heat exchange device in the present technical solution, its heat source air is transmitted to the inside of the second pipe through the first pipe, transmitted to the inside of the first heat exchanger through the second pipe, transmitted to the inside of the third pipe through the first heat exchanger, and then transmitted to the inside of the second heat exchanger through the third pipe. After passing through the second heat exchanger, it is transmitted to the inside of the fourth pipe and finally transmitted away through the fifth pipe. The ninth pipe transmits the liquid argon used for heat exchange to the inside of the tenth pipe. The liquid argon is transmitted to the inside of the first heat exchange tube in the first heat exchanger through the tenth pipe. The first heat exchange tube exchanges the heat in the first heat exchanger with the heat in the first heat exchanger. The heat exchange is carried out with the source air, and the liquid argon after heat exchange is transmitted to the inside of the fourteenth pipe through the twelfth pipe and is finally discharged through the fourteenth pipe. When the liquid argon is affected by the gas consumption of the customer and produces an intermittent supply, the contaminated nitrogen gas in the fifteenth pipe is transmitted to the inside of the sixteenth pipe and is transmitted to the second heat exchanger through the sixteenth pipe. The second heat exchange pipe performs heat exchange on the heat source air entering the second heat exchanger. When a set of structures and devices in the first heat exchanger and the second heat exchanger need to be repaired, the staff can turn the first reversing valve to close the passage between the first pipe and the second pipe and open The passage between the first and sixth pipes is opened by rotating the second reversing valve to close the passage between the fourth and fifth pipes and to open the passage between the eighth and fifth pipes. In this way, the heat source air input through the first pipe is transmitted to the interior of the third and fourth heat exchangers for heat exchange. At the same time, the staff also needs to rotate the third reversing valve to close the passage between the ninth and tenth pipes and to open the passage between the ninth and eleventh pipes. Then, the staff needs to rotate the fourth reversing valve to close the passage between the twelfth and fourteenth pipes and to open the passage between the thirteenth and fourteenth pipes. In this way, the ninth pipe can input liquid argon into the third heat exchange tube in the third heat exchanger for heat exchange, and then discharge it from the fourteenth pipe. Of course, the staff also needs to rotate the fifth reversing valve to close the passage between the fifteenth and sixteenth pipes and to open the passage between the fifteenth and seventeenth pipes. Then, the staff needs to rotate the sixth reversing valve to close the passage between the eighteenth and twentieth pipes and to open the passage between the nineteenth and twentieth pipes. In this way, the fifteenth pipe can input the contaminated nitrogen gas into the fourth heat exchange tube in the fourth heat exchanger for heat exchange, and then discharge it from the twentieth pipe.
[0007] Preferably, a first reversing valve is provided at one middle end of the interior of the housing, with a first pipe connected to one side of the first reversing valve. The front end of the first pipe is connected to the first heat exchanger via the second pipe, and the rear end of the first pipe is connected to the third heat exchanger via the sixth pipe. The provision of the first reversing valve allows the passage between the first pipe and the second pipe and the passage between the first pipe and the sixth pipe to be switched, thereby achieving the effect of switching the pipe passages.
[0008] Preferably, a second reversing valve is provided at the other middle end of the interior of the housing, with a fifth pipe connected to one side of the second reversing valve. The front end of the second reversing valve is connected to the second heat exchanger via the fourth pipe, and the rear end of the second reversing valve is connected to the fourth heat exchanger via the eighth pipe. The provision of the second reversing valve allows the passage between the fourth pipe and the fifth pipe and the passage between the eighth pipe and the fifth pipe to be switched, thereby achieving the effect of switching the pipe passages.
[0009] Preferably, a third reversing valve is provided at one end of the inner top end of the housing, the top end of the third reversing valve being connected to a ninth pipe, the front end of the third reversing valve being connected to the first heat exchange pipe via a tenth pipe, and the rear end of the third reversing valve being connected to the third heat exchange pipe via an eleventh pipe. The provision of the third reversing valve allows the passage between the ninth and tenth pipes and the passage between the ninth and eleventh pipes to be switched, thereby achieving the effect of switching the pipe passages.
[0010] Preferably, a fifth reversing valve is provided at the other end of the inner top of the housing. The top end of the fifth reversing valve is connected to a fifteenth pipe. The front end of the fifth reversing valve is connected to the second heat exchange pipe via a sixteenth pipe, and the rear end of the fifth reversing valve is connected to the fourth heat exchange pipe via a seventeenth pipe. The provision of the fifth reversing valve allows the passage between the fifteenth and sixteenth pipes and the passage between the fifteenth and seventeenth pipes to be switched, thereby achieving the effect of switching the pipe passages.
[0011] Preferably, a fourth reversing valve is provided at one end of the bottom end of the interior of the housing, the bottom end of the fourth reversing valve being connected to a fourteenth pipe, the front end of the fourth reversing valve being connected to the first heat exchange pipe via the twelfth pipe, and the rear end of the fourth reversing valve being connected to the third heat exchange pipe via the thirteenth pipe. The provision of the fourth reversing valve allows the passage between the twelfth and fourteenth pipes and the passage between the thirteenth and fourteenth pipes to be switched, thereby achieving the effect of switching the pipe passages.
[0012] Preferably, a sixth reversing valve is provided at the other end of the inner bottom of the housing. The bottom end of the sixth reversing valve is connected to the 20th pipe. The front end of the sixth reversing valve is connected to the second heat exchange pipe via the 18th pipe, and the rear end of the sixth reversing valve is connected to the fourth heat exchange pipe via the 19th pipe. By providing the sixth reversing valve, the passage between the 18th pipe and the 20th pipe and the passage between the 19th pipe and the 20th pipe can be switched, thereby achieving the effect of switching the pipe passages.
[0013] Preferably, a door is mounted on the front surface of the box body via a hinge, and a support foot is provided on the bottom surface of the box body. The door allows a worker to rotate it open to operate the device inside the box body, providing a location for operation, while the support foot allows the utility model to be stably placed off the ground for use.
[0014] Preferably, a handle is provided at one end of the door surface, and a fixed lock is provided on one side of the handle. The handle makes it easier for staff to open the door and provides a point of force, while the fixed lock allows the door to be locked firmly to prevent it from being opened by non-staff without authorization.
[0015] Compared with the prior art, the beneficial effects of the present invention are:
[0016] 1. This utility model features four heat exchangers, divided into two groups, to ensure continuous heat exchange with contaminated nitrogen gas when the liquid argon supply is interrupted, thereby improving the flexibility and stability of the system. Furthermore, when one group of heat exchangers is under maintenance, it can be quickly switched to another group to ensure production continuity. Furthermore, this device improves cold recovery efficiency and effectively utilizes the cooling potential of contaminated nitrogen gas, thereby reducing the risk of liquid argon leakage, enhancing overall economic benefits, and optimizing the production process. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the main internal structure of the utility model;
[0018] Figure 2 This is a schematic diagram of the internal structure of the utility model from a top view;
[0019] Figure 3 This is a schematic diagram of the main appearance structure of the utility model;
[0020] Figure 4 This is a schematic diagram of the internal structure of the first heat exchanger of the present invention;
[0021] Figure 5 This is a schematic diagram of the internal structure of the second heat exchanger of the present invention;
[0022] Figure 6 This is a schematic diagram of the internal structure of the third heat exchanger of the present utility model;
[0023] Figure 7 This is a schematic diagram of the internal structure of the fourth heat exchanger of the present utility model.
[0024] In the figure: 1, box; 2, ninth pipeline; 3, fifteenth pipeline; 4, eighth pipeline; 5, second reversing valve; 6, fourth pipeline; 7, fifth pipeline; 8, fifth reversing valve; 9, sixteenth pipeline; 10, seventeenth pipeline; 11, third reversing valve; 12, eleventh pipeline; 13, tenth pipeline; 14, thirteenth pipeline; 15, twelfth pipeline; 16, fourth reversing valve; 17, fourteenth pipeline; 18, third pipeline; 19, Pipeline 7; 20, Pipeline 19; 21, Pipeline 18; 22, Reversing valve 6; 23, Pipeline 20; 24, Pipeline 6; 25, Reversing valve 1; 26, Pipeline 2; 27, Pipe 1; 28, Heat exchanger 1; 29, Heat exchanger 3; 30, Heat exchanger 4; 31, Heat exchanger 2; 32, Door; 33, Heat exchange tube 1; 34, Heat exchange tube 2; 35, Heat exchange tube 3; 36, Heat exchange tube 4. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.
[0026] Example 1
[0027] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, a medium-pressure liquid argon heat exchange device proposed in the present invention includes a box body 1, a first heat exchanger 28 is provided at one end of the internal front end of the box body 1, a first heat exchanger 33 is provided inside the first heat exchanger 28, a second heat exchanger 31 is provided at the other end of the internal front end of the box body 1, a second heat exchanger 34 is provided inside the second heat exchanger 31, and the second heat exchanger 31 is connected to the first heat exchanger 28 through a third pipe 18, a third heat exchanger 29 is provided at one end of the internal rear end of the box body 1, a third heat exchanger 35 is provided inside the third heat exchanger 29, a fourth heat exchanger 30 is provided at the other end of the internal rear end of the box body 1, a fourth heat exchanger 36 is provided inside the fourth heat exchanger 30, and the fourth heat exchanger 30 is connected to the third heat exchanger 29 through a seventh pipe 19.
[0028] The heat source air is transmitted to the inside of the second pipe 26 through the first pipe 27, and then to the inside of the first heat exchanger 28 through the second pipe 26, and then to the inside of the third pipe 18 through the first heat exchanger 28, and then to the inside of the second heat exchanger 31 through the third pipe 18, and then to the inside of the fourth pipe 6 after passing through the second heat exchanger 31, and finally transmitted away through the fifth pipe 7, and the ninth pipe 2 will transmit the liquid argon used for heat exchange to the inside of the tenth pipe 13, and the liquid argon is transmitted to the inside of the first heat exchange pipe 33 in the first heat exchanger 28 through the tenth pipe 13. The first heat exchange pipe 33 performs heat exchange on the heat source air in the first heat exchanger 28. After the heat exchange, The liquid argon will be transmitted to the inside of the fourteenth pipeline 17 through the twelfth pipeline 15, and finally discharged through the fourteenth pipeline 17. When the liquid argon is affected by the gas consumption of the customer and produces an intermittent supply, the contaminated nitrogen gas in the fifteenth pipeline 3 will be transmitted to the inside of the sixteenth pipeline 9, and then transmitted to the second heat exchanger 31 through the sixteenth pipeline 9. The second heat exchange pipe 34 performs heat exchange on the heat source air entering the second heat exchanger 31. When the structures and other devices in a group of the first heat exchanger 28 and the second heat exchanger 31 need to be repaired, the staff can turn the first reversing valve 25 to close the passage between the first pipeline 27 and the second pipeline 26, and open the passage between the first pipeline 27 and the sixth pipeline 24. The passage between the ninth and tenth pipes 2 and 13 is closed, and the passage between the ninth and eleventh pipes 12 is opened. The fourth reversing valve 16 is then turned to close the passage between the twelfth and fourteenth pipes 17 and to open the passage between the thirteenth and fourteenth pipes 17. In this way, the heat source air input through the first pipe 27 is transmitted to the interior of the third heat exchanger 29 and the fourth heat exchanger 30 for heat exchange operation. At the same time, the staff also needs to turn the third reversing valve 11 to close the passage between the ninth and tenth pipes 2 and 13, and open the passage between the ninth and eleventh pipes 12. Then, the fourth reversing valve 16 is turned to close the passage between the twelfth and fourteenth pipes 17 and to open the passage between the thirteenth and fourteenth pipes 17. The ninth pipeline 2 can input liquid argon into the third heat exchange tube 35 in the third heat exchanger 29 for heat exchange, and then discharge it from the fourteenth pipeline 17. Of course, the staff also needs to rotate the fifth reversing valve 8 to close the channel between the fifteenth pipeline 3 and the sixteenth pipeline 9, open the channel between the fifteenth pipeline 3 and the seventeenth pipeline 10, and then rotate the sixth reversing valve 22 to close the channel between the eighteenth pipeline 21 and the twentieth pipeline 23, and open the channel between the nineteenth pipeline 20 and the twentieth pipeline 23. In this way, the fifteenth pipeline 3 can input the contaminated nitrogen gas into the fourth heat exchange tube 36 in the fourth heat exchanger 30 for heat exchange, and then discharge it from the twentieth pipeline 23.
[0029] Example 2
[0030] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the medium-pressure liquid argon heat exchange device proposed by the present invention, compared with the first embodiment, this embodiment further includes: a first reversing valve 25 is provided at one middle end of the interior of the box body 1, one side of the first reversing valve 25 is connected to a first pipe 27, the front end of the first pipe 27 is connected to the first heat exchanger 28 through the second pipe 26, and the rear end of the first pipe 27 is connected to the third heat exchanger 29 through the sixth pipe 24, and a second reversing valve 5 is provided at the other middle end of the interior of the box body 1, and one side of the second reversing valve 5 is connected to a fifth pipe 7, The front end of the second reversing valve 5 is connected to the second heat exchanger 31 through the fourth pipe 6, and the rear end of the second reversing valve 5 is connected to the fourth heat exchanger 30 through the eighth pipe 4. A third reversing valve 11 is provided at one end of the top end of the interior of the box body 1. The top end of the third reversing valve 11 is connected to the ninth pipe 2. The front end of the third reversing valve 11 is connected to the first heat exchange pipe 33 through the tenth pipe 13. The rear end of the third reversing valve 11 is connected to the third heat exchange pipe 35 through the eleventh pipe 12. The other end of the top end of the interior of the box body 1 is provided with a fifth reversing valve 8, the top of the fifth reversing valve 8 is connected to the fifteenth pipe 3, the front end of the fifth reversing valve 8 is connected to the second heat exchange pipe 34 through the sixteenth pipe 9, and the rear end of the fifth reversing valve 8 is connected to the fourth heat exchange pipe 36 through the seventeenth pipe 10. A fourth reversing valve 16 is provided at one end of the bottom end of the box body 1, the bottom end of the fourth reversing valve 16 is connected to the fourteenth pipe 17, the front end of the fourth reversing valve 16 is connected to the first heat exchange pipe 33 through the twelfth pipe 15, and the rear end of the fourth reversing valve 16 is connected to the third heat exchange pipe 34 through the thirteenth pipe 14. The heat exchange tube 35 is connected, and a sixth reversing valve 22 is provided at the other end of the inner bottom end of the box body 1. The bottom end of the sixth reversing valve 22 is connected to the twentieth pipe 23. The front end of the sixth reversing valve 22 is connected to the second heat exchange tube 34 through the eighteenth pipe 21, and the rear end of the sixth reversing valve 22 is connected to the fourth heat exchange tube 36 through the nineteenth pipe 20. A box door 32 is installed on the external front surface of the box body 1 through a hinge. A support foot is provided on the external bottom surface of the box body 1. A handle is provided at one end of the surface of the box door 32, and a fixed lock is provided on one side of the handle.
[0031] In this embodiment, Figure 1 and Figure 2 As shown, by providing the first reversing valve 25, the channel between the first pipeline 27 and the second pipeline 26 and the channel between the first pipeline 27 and the sixth pipeline 24 can be switched with each other, achieving the effect of switching the pipeline passage;
[0032] like Figure 1 and Figure 2As shown, by providing the second reversing valve 5, the channel between the fourth pipeline 6 and the fifth pipeline 7 and the channel between the eighth pipeline 4 and the fifth pipeline 7 can be switched with each other, achieving the effect of switching the pipeline passage;
[0033] like Figure 1 and Figure 2 As shown, by providing the third reversing valve 11, the channel between the ninth pipeline 2 and the tenth pipeline 13 and the channel between the ninth pipeline 2 and the eleventh pipeline 12 can be switched with each other, achieving the effect of switching the pipeline passage;
[0034] like Figure 1 and Figure 2 As shown, by providing the fifth reversing valve 8, the channel between the fifteenth pipeline 3 and the sixteenth pipeline 9 and the channel between the fifteenth pipeline 3 and the seventeenth pipeline 10 can be switched with each other, achieving the effect of switching the pipeline passage;
[0035] like Figure 1 and Figure 2 As shown, by providing the fourth reversing valve 16, the channel between the twelfth pipeline 15 and the fourteenth pipeline 17 and the channel between the thirteenth pipeline 14 and the fourteenth pipeline 17 can be switched with each other, thereby achieving the effect of switching the pipeline passages;
[0036] like Figure 1 and Figure 2 As shown, by providing the sixth reversing valve 22, the channel between the 18th pipeline 21 and the 20th pipeline 23 and the channel between the 19th pipeline 20 and the 20th pipeline 23 can be switched with each other, achieving the effect of switching the pipeline passages;
[0037] like Figure 3 As shown, the installation of the box door 32 allows the staff to rotate it open to operate the device in the box body 1, providing an operating position, and the installation of the support feet allows the utility model to be stably placed off the ground for use;
[0038] like Figure 3 As shown, the setting of the handle makes it easy for the staff to open the box door 32 and provides a force application point, while the setting of the fixed lock allows the box door 32 to be fixedly locked to prevent it from being opened by non-staff without authorization.
[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A medium-pressure liquid argon heat exchange device, comprising a housing (1), characterized in that: A first heat exchanger (28) is provided at one end of the front end of the interior of the box (1), and a first heat exchange tube (33) is provided inside the first heat exchanger (28). A second heat exchanger (31) is provided at the other end of the front end of the interior of the box (1), and a second heat exchange tube (34) is provided inside the second heat exchanger (31), and the second heat exchanger (31) is connected to the first heat exchanger (28) through a third pipe (18). A third heat exchanger (29) is provided at one end of the rear end of the interior of the box (1), and a third heat exchange tube (35) is provided inside the third heat exchanger (29). A fourth heat exchanger (30) is provided at the other end of the rear end of the interior of the box (1), and a fourth heat exchange tube (36) is provided inside the fourth heat exchanger (30), and the fourth heat exchanger (30) is connected to the third heat exchanger (29) through a seventh pipe (19).
2. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A first reversing valve (25) is provided at one middle end of the interior of the box (1), one side of the first reversing valve (25) is connected to a first pipe (27), the front end of the first pipe (27) is connected to the first heat exchanger (28) via a second pipe (26), and the rear end of the first pipe (27) is connected to the third heat exchanger (29) via a sixth pipe (24).
3. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A second reversing valve (5) is provided at the other end of the middle of the interior of the box (1), one side of the second reversing valve (5) is connected to a fifth pipe (7), the front end of the second reversing valve (5) is connected to the second heat exchanger (31) via a fourth pipe (6), and the rear end of the second reversing valve (5) is connected to the fourth heat exchanger (30) via an eighth pipe (4).
4. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A third reversing valve (11) is provided at one end of the top end of the interior of the box (1), the top end of the third reversing valve (11) is connected to a ninth pipe (2), the front end of the third reversing valve (11) is connected to the first heat exchange pipe (33) via a tenth pipe (13), and the rear end of the third reversing valve (11) is connected to the third heat exchange pipe (35) via an eleventh pipe (12).
5. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A fifth reversing valve (8) is provided at the other end of the top end of the interior of the box (1), the top end of the fifth reversing valve (8) is connected to the fifteenth pipe (3), the front end of the fifth reversing valve (8) is connected to the second heat exchange pipe (34) via the sixteenth pipe (9), and the rear end of the fifth reversing valve (8) is connected to the fourth heat exchange pipe (36) via the seventeenth pipe (10).
6. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A fourth reversing valve (16) is provided at one end of the bottom end of the interior of the box (1), the bottom end of the fourth reversing valve (16) is connected to a fourteenth pipe (17), the front end of the fourth reversing valve (16) is connected to the first heat exchange pipe (33) via a twelfth pipe (15), and the rear end of the fourth reversing valve (16) is connected to the third heat exchange pipe (35) via a thirteenth pipe (14).
7. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: A sixth reversing valve (22) is provided at the other end of the bottom end of the box body (1), the bottom end of the sixth reversing valve (22) is connected to a twentieth pipe (23), the front end of the sixth reversing valve (22) is connected to the second heat exchange pipe (34) through an eighteenth pipe (21), and the rear end of the sixth reversing valve (22) is connected to the fourth heat exchange pipe (36) through a nineteenth pipe (20).
8. The medium-pressure liquid argon heat exchange device according to claim 1, characterized in that: The outer front surface of the box body (1) is provided with a box door (32) which is rotatably mounted via hinges, and the outer bottom surface of the box body (1) is provided with supporting feet.
9. The medium-pressure liquid argon heat exchange device according to claim 8, characterized in that: A handle is provided at one end of the surface of the door (32), and a fixed lock is provided on one side of the handle.