Snakelike flow channel heat exchanger and dilution refrigerator

Abstract

The invention relates to the technical field of extremely-low-temperature refrigeration equipment, and provides a snakelike flow channel heat exchanger which comprises a first flow channel, a second flow channel, a third flow channel and a fourth flow channel, the second runner is provided with a plurality of second circulating sections which are parallel to one another; the first circulation sections and the second circulation sections are sequentially arranged in a crossed and stacked mode, and heat exchange connection is formed between the adjacent first circulation sections and second circulation sections. The second circulation sections are arranged on the two sides of each first circulation section, and the first circulation sections are arranged on the two sides of each second circulation section. Therefore, by means of the structure that the circulation sections of the two flow channels are sequentially stacked in a crossed mode, different media circulate in the first flow channel and the second flow channel respectively, and due to the fact that the circulation sections of the two flow channels are sequentially stacked and arranged in a crossed mode, the media in the circulation section of each flow channel can exchange heat with the media in the two circulation sections of the opposite flow channel. The space is fully utilized, the heat exchange area of the two flow channels is increased, and the heat exchange efficiency is improved. The invention further provides a dilution refrigerator.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of extremely low temperature refrigeration equipment, and particularly relates to a serpentine flow channel heat exchanger and a dilution refrigerator. BACKGROUND

[0002] For the core component of the dilution refrigerator, the powder sintered heat exchanger, in the extremely low temperature environment, the thermal resistance between the liquid and the solid surface will be exponentially increased by the Kapitza thermal resistance, thereby seriously affecting the heat exchange effect.

[0003] Therefore, a specific metal powder is usually sintered on the heat exchanger partition plate to increase the heat exchange area, so as to achieve good heat exchange effect. However, in order to obtain extremely low temperature, it is necessary to continuously increase the heat exchange area of the powder sintered heat exchanger. The heat exchanger in the current dilution refrigerator is limited in installation space, which limits the increase of the heat exchange area, so that the heat exchange effect enters a bottleneck.

[0004] Therefore, the prior art has obvious inconvenience and defects in actual use, and needs to be improved. SUMMARY

[0005] In view of the above defects, the present application mainly provides a serpentine flow channel heat exchanger to solve the technical problem of realizing large heat exchange area in limited space.

[0006] In order to solve the above problems, the present application provides a serpentine flow channel heat exchanger, which comprises a first flow channel and a second flow channel which are not connected to each other, and specifically:

[0007] The first flow channel is used for flowing the first medium, and has a plurality of first flow-through sections which are connected in sequence and parallel to each other along the flow direction of the first medium; and the adjacent two first flow-through sections are connected through a first transition section;

[0008] The second flow channel is used for flowing the second medium, and has a plurality of second flow-through sections which are connected in sequence and parallel to each other along the flow direction of the second medium; and the adjacent two second flow-through sections are connected through a second transition section;

[0009] Each first flow-through section of the first flow channel and each second flow-through section of the second flow channel are arranged in sequence and cross and overlap, and the adjacent first flow-through section and second flow-through section form a heat exchange connection; specifically, except for the flow-through sections located at the most side, the two sides of each first flow-through section are second flow-through sections, and the two sides of each second flow-through section are first flow-through sections.

[0010] According to the serpentine flow channel heat exchanger of the present application, the box body, a plurality of layers of guide plates are arranged in parallel in the box body; the upper and lower sides of each layer of guide plates form the first flow-through section and the second flow-through section, respectively;

[0011] The first transition section is connected with a first flow section on the upper side and a first flow section on the lower side, and the second transition section is connected with a second flow section on the upper side and a second flow section on the lower side.

[0012] The first transition section is connected with a first flow section on the upper side and a first flow section on the lower side, and the second transition section is connected with a second flow section on the upper side and a second flow section on the lower side.

[0013] The first transition section is connected with a first flow section on the upper side and a first flow section on the lower side, and the second transition section is connected with a second flow section on the upper side and a second flow section on the lower side.

[0014] The first transition section is connected with a first flow section on the upper side and a first flow section on the lower side, and the second transition section is connected with a second flow section on the upper side and a second flow section on the lower side.

[0015] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0016] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0017] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0018] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0019] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0020] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0021] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0022] According to the serpentine flow channel heat exchanger, the transition section comprises a vertical partition plate, and the first flow section and the second flow section are formed on the two sides of the partition plate.

[0023] In summary, the serpentine flow channel heat exchanger of the present application, through the structure of the flow-through sections of two flow channels being sequentially cross-stacked, different media flow through the first flow channel and the second flow channel respectively, and since the flow-through sections of the two flow channels are sequentially cross-stacked, the media in the flow-through section of each flow channel can form heat exchange with the media in the two flow-through sections of the opposite flow channel. The space is fully utilized, the heat exchange area of the two flow channels is increased, and the heat exchange efficiency is improved. The present application also provides a dilution refrigerator having the serpentine flow channel heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application;

[0025] Figure 2 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application; Figure 1

[0026] Figure 3 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application; Figure 2

[0027] Figure 4 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application; Figure 2

[0028] Figure 5 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application;

[0029] Figure 6 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application;

[0030] Figure 7 is a structural schematic view of an embodiment of the serpentine flow channel heat exchanger of the present application;

[0031] In the figure: 1 - box, 11 - first medium pipe, 12 - second medium pipe, 13 - flow guide plate, 14 - partition plate; 2 - first flow-through section, 21 - first transition section; 3 - second flow-through section, 31 - second transition section. DETAILED DESCRIPTION

[0032] Referring to Figure 1 and Figure 2 , the present application provides a serpentine flow channel heat exchanger, comprising a first flow channel and a second flow channel which are not connected to each other, specifically:

[0033] The first flow channel is used for flowing a first medium; and has a plurality of first flow-through sections 2 which are parallel to each other, along the flow direction of the first medium, and sequentially connected; and adjacent two first flow-through sections 2 are connected through a first transition section 21.

[0034] In combination with Figure 3 ​​​, the second flow channel is used for flowing the second medium; the second flow channel has a plurality of second flow passages 3 which are parallel to each other, along the flowing direction of the second medium, and are connected in sequence; two adjacent second flow passages 3 are connected through a second transition section 31;

[0035] The first flow passage and the second flow passage are arranged in the form of a serpentine flow channel heat exchanger.

[0036] The first flow passage and the second flow passage of the serpentine flow channel heat exchanger of the present application are used for flowing different mediums, respectively, and the flow passages of the two flow channels are arranged in the form of a serpentine flow channel heat exchanger, so that the medium in each flow passage of each flow channel can exchange heat with the mediums in the two flow passages of the opposite flow channel.

[0037] Referring to Figure 2 and Figure 3 , the double arrow in the figure shows the flowing direction of the first medium, and the single arrow shows the flowing direction of the second medium. The two mediums can exchange heat with the mediums in the two adjacent flow passages of the opposite flow channel in any flow passage during flowing. In the case of a determined space volume, the heat exchange contact area of the flow path and the two flow channels is increased, and the heat exchange efficiency is improved. The serpentine flow channel heat exchanger of the present application fully utilizes the space, and realizes the increase of the heat exchange area of the two flow channels and the improvement of the heat exchange efficiency in a limited space.

[0038] Further, the inner wall of the first flow passage and the second flow passage is formed with a metal powder sintering layer. The metal powder sintering material has a micro-porous structure, and a large contact heat exchange area is generated, so that the heat exchange effect is improved.

[0039] Better, the metal powder sintering layer is formed of nano metal powder, and the specific surface area is large, so that the heat exchange area is increased. Preferably, the nano metal powder is silver powder, and the heat conductivity is good, so that the heat exchange efficiency is high.

[0040] The serpentine flow channel heat exchanger of the present application is used for dilution refrigeration, for example, the first flow passage is used for flowing the concentrated phase medium, and the second flow passage is used for flowing the dilute phase medium.

[0041] As an embodiment of the serpentine flow channel heat exchanger of the present application, the serpentine flow channel heat exchanger comprises a box body 1, and a plurality of layers of flow guide plates 13 are arranged in the box body 1 in parallel; the upper side and the lower side of each layer of flow guide plates 13 are formed with the first flow passage 2 and the second flow passage 3, respectively.

[0042] Combined with Figure 4, the first flow-through section 2 and the second flow-through section 3 of each two adjacent layers form a transition zone on one side from top to bottom in the box 1; the transition zone comprises a first transition section 21 and a second transition section 31; each transition zone forms alternately on the left and right sides from top to bottom in the box 1;

[0043] The upper and lower sides of the first transition section 21 are connected with a first flow-through section 2 respectively, and the upper and lower sides of the second transition section 31 are connected with a second flow-through section 3 respectively;

[0044] The first flow-through section 2 of each layer is connected in sequence to form the first flow channel through the first transition section 21 from top to bottom in the box 1; and the second flow-through section 3 of each layer is connected in sequence to form the second flow channel through the second transition section 31 from top to bottom in the box 1;

[0045] The two ends of the first flow channel are respectively communicated with a first medium pipe 11 arranged on the box 1, and the two ends of the second flow channel are respectively communicated with a second medium pipe 12 arranged on the box 1;

[0046] Different media are introduced into the first flow channel and the second flow channel through the first medium pipe 11 and the second medium pipe 12 respectively, and heat exchange is completed in the box 1.

[0047] The two sides of each layer of the flow guide plate 13 flow different media respectively, which improves the heat exchange area and efficiency and realizes sufficient heat exchange of the two media.

[0048] As an embodiment, the transition zone comprises a vertical partition plate 14; the two sides of the partition plate 14 form the first flow-through section 2 and the second flow-through section 3 respectively; when the two media flow through the transition zone, heat exchange is realized through the partition plate 14, so that heat exchange is formed in the whole process of the media flowing in the flow channel, and the heat exchange efficiency is improved.

[0049] Further, the flow guide plate 13 and the partition plate 14 are both formed with a metal powder sintering layer, which improves the heat exchange efficiency.

[0050] The flow guide plate 13 and the partition plate 14 of the present application are both metal materials, and have good heat conductivity.

[0051] Optionally, the adjacent first flow-through section 2 and second flow-through section 3 of the transition zone have three layers of flow guide plates 13, and the partition plate 14 is sequentially connected with the three layers of flow guide plates 13 in the longitudinal direction; better, the partition plate 14 equally divides the thickness direction of the flow guide plate 13, so that the thickness of the first transition section 21 and the second transition section 31 is the same; the width of the partition plate 14 in the horizontal direction can be adaptively designed according to the flow capacity of the transition section and the thickness of the transition section.

[0052] The present application increases the heat exchange area and the heat exchange efficiency by arranging the multiple layers of flow guide plates 13 in the box 1 to form two flow channels which are arranged in a cross-over manner.

[0053] Referring to Figure 1 , according to the actual use scene, the box 1 of the present application can be placed vertically, and in combination with Figure 6 and Figure 7 , it can also be placed horizontally or horizontally.

[0054] Referring to Figure 5 and Figure 7 , as an embodiment, the box 1 of the serpentine flow channel heat exchanger is multiple, and each box 1 is connected in series to realize multi-stage heat exchange.

[0055] The first flow channel and the second flow channel in each box 1 are connected in series along the flow direction of the respective medium.

[0056] Further, each box 1 can be connected in series along the horizontal direction or connected in series along the vertical direction.

[0057] The present application also provides a dilution refrigerator with the serpentine flow channel heat exchanger.

[0058] In summary, the present application provides a serpentine flow channel heat exchanger, which is arranged in a cross-over manner by the flow channels, and different media flow in the first flow channel and the second flow channel, respectively. Since the flow channels are arranged in a cross-over manner, the medium in each flow channel can exchange heat with the media in the two flow channels of the opposite flow channel. The space is fully utilized, the heat exchange area of the two flow channels is increased, and the heat exchange efficiency is improved. The present application also provides a dilution refrigerator with the serpentine flow channel heat exchanger.

[0059] Of course, the present application can have other various embodiments, and those skilled in the art can make various corresponding changes and modifications according to the present application without departing from the spirit and essence of the present application. However, these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A serpentine flow channel heat exchanger, characterized in that, This includes a first and second flow channels that are not interconnected, specifically: A first flow channel is used to flow a first medium; it has multiple parallel first flow sections connected sequentially along the flow direction of the first medium; adjacent first flow sections are connected by a first transition section. The second flow channel is used for the flow of the second medium; it has multiple parallel second flow sections connected sequentially along the flow direction of the second medium; adjacent second flow sections are connected by a second transition section. The first flow sections of the first flow channel and the second flow sections of the second flow channel are arranged in a staggered manner, and a heat exchange connection is formed between adjacent first flow sections and second flow sections; specifically, except for the flow section located on the outermost side, each first flow section is surrounded by second flow sections on both sides, and each second flow section is surrounded by first flow sections on both sides.

2. The serpentine flow channel heat exchanger as described in claim 1, characterized in that, The device includes a housing, inside which multiple layers of guide plates are arranged in parallel; the upper and lower sides of each layer of guide plates form the first flow section and the second flow section, respectively. From top to bottom within the housing, a transition zone is formed on one side of every two adjacent first and second flow sections; the transition zone includes a first transition section and a second transition section; from top to bottom within the housing, each transition zone is alternately formed on the left and right sides. The upper and lower sides of the first transition section are respectively connected to a first flow section, and the upper and lower sides of the second transition section are respectively connected to a second flow section; Inside the box, from top to bottom, each layer of the first flow section is connected sequentially through a first transition section to form the first flow channel; each layer of the second flow section is connected sequentially through a second transition section to form the second flow channel. The two ends of the first flow channel are respectively connected to a first medium pipe disposed on the box body, and the two ends of the second flow channel are respectively connected to a second medium pipe disposed on the box body.

3. The serpentine flow channel heat exchanger as described in claim 2, characterized in that, The transition zone includes a vertically arranged partition plate; a first flow section and a second flow section are formed on both sides of the partition plate, respectively.

4. The serpentine flow channel heat exchanger as described in claim 3, characterized in that, The adjacent first and second flow sections of the transition zone have three layers of guide plates, and the partition plate passes through the three layers of guide plates in sequence along the longitudinal direction.

5. The serpentine flow channel heat exchanger as described in claim 3, characterized in that, Both the flow guide plate and the partition plate are formed with a sintered metal powder layer.

6. The serpentine flow channel heat exchanger as described in claim 5, characterized in that, The sintered metal powder layer is formed by sintering nano-metal powder.

7. The serpentine flow channel heat exchanger as described in claim 6, characterized in that, The nano-metal powder is silver powder.

8. The serpentine flow channel heat exchanger as described in claim 2, characterized in that, The enclosure consists of multiple units, which are connected in series sequentially.

9. The serpentine flow channel heat exchanger as described in claim 8, characterized in that, The boxes are connected in series in either the horizontal or vertical direction.

10. A dilution refrigeration machine, characterized in that, It has a serpentine flow channel heat exchanger as described in any one of claims 1 to 9.

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