A serpentine flow passage heat exchanger and dilution refrigerator

Abstract

The present application relates to the technical field of cryogenic refrigeration equipment, and provides a serpentine flow channel heat exchanger, which comprises a first flow channel with a plurality of first flow channels arranged in parallel with each other, and a second flow channel with a plurality of second flow channels arranged in parallel with each other; each first flow channel and each second flow channel are arranged in sequence in a cross-over and stacking mode, and a heat exchange connection is formed between adjacent first flow channels and second flow channels; both sides of each first flow channel are second flow channels, and both sides of each second flow channel are first flow channels. In this way, the first flow channel and the second flow channel respectively flow with different media, and the flow channels of the two flow channels are arranged in sequence in a cross-over and stacking mode, so that the media in the flow channels of each flow channel can form heat exchange 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.

Description

Technical Field

[0001] This invention belongs to the technical field of cryogenic refrigeration equipment, and particularly relates to a serpentine flow channel heat exchanger and a dilution refrigeration machine. Background Technology

[0002] For the core component of the dilution refrigeration unit—the powder sintered heat exchanger—in extremely low temperature environments, the thermal resistance between the liquid and solid surfaces increases exponentially due to the influence of the Carpicar thermal resistance, which in turn severely affects the heat exchange effect.

[0003] Therefore, specific metal powders are typically sintered onto heat exchanger baffles to increase the heat exchange area and achieve good heat exchange performance. However, to obtain extremely low temperatures, it is necessary to continuously increase the heat exchange area of ​​the powder-sintered heat exchanger. Currently, the heat exchangers in dilution refrigeration machines are limited by installation space, restricting the increase of heat exchange area and thus creating a bottleneck in heat exchange performance.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention primarily provides a serpentine flow channel heat exchanger, solving the technical problem of achieving a large heat exchange area within a limited space.

[0006] To address the aforementioned problems, this invention provides a serpentine flow channel heat exchanger, comprising a first flow channel and a second flow channel that are not interconnected, specifically:

[0007] 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.

[0008] 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.

[0009] 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.

[0010] According to the serpentine flow channel heat exchanger of the present invention, the housing has multiple layers of guide plates arranged in parallel inside the housing; the upper and lower sides of each layer of guide plates respectively form the first flow section and the second flow section;

[0011] 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.

[0012] 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;

[0013] 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.

[0014] 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.

[0015] According to the serpentine flow channel heat exchanger of the present invention, the transition zone includes a vertically arranged partition plate; a first flow section and a second flow section are respectively formed on both sides of the partition plate.

[0016] According to the serpentine flow channel heat exchanger of the present invention, the adjacent first flow section and second flow section 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.

[0017] According to the serpentine flow channel heat exchanger of the present invention, both the guide plate and the partition plate are formed with a sintered metal powder layer.

[0018] According to the serpentine flow channel heat exchanger of the present invention, the metal powder sintered layer is formed by sintering nano-metal powder.

[0019] In the serpentine flow channel heat exchanger of the present invention, the nano-metal powder is silver powder.

[0020] According to the serpentine flow channel heat exchanger of the present invention, there are multiple housings, and the housings are connected in series sequentially.

[0021] According to the serpentine flow channel heat exchanger of the present invention, the various housings are connected in series in the horizontal or vertical direction.

[0022] A dilution refrigeration machine having the aforementioned serpentine flow channel heat exchanger.

[0023] In summary, the serpentine flow channel heat exchanger of the present invention, through a structure in which the flow sections of the two channels are stacked in a crisscross pattern, allows different media to flow in the first and second channels respectively. Because the flow sections of the two channels are stacked and cross-arranged, the medium in each flow section can exchange heat with the media in the two flow sections of the opposite channel. This fully utilizes space, increases the heat exchange area of ​​the two channels, and improves the heat exchange efficiency. The present invention also provides a dilution refrigerator having the aforementioned serpentine flow channel heat exchanger. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the serpentine flow channel heat exchanger of the present invention;

[0025] Figure 2 yes Figure 1 Internal structure diagram;

[0026] Figure 3 yes Figure 2 A schematic diagram of the structure in direction A;

[0027] Figure 4 yes Figure 2 Schematic diagram of partial cross-sectional structure along line B in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of an embodiment of the serpentine flow channel heat exchanger of the present invention;

[0029] Figure 6 This is a schematic diagram of the serpentine flow channel heat exchanger of the present invention placed horizontally;

[0030] Figure 7 This is a schematic diagram of the horizontally placed serpentine flow channel heat exchanger of the present invention;

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

[0032] See Figure 1 and Figure 2 This invention provides a serpentine flow channel heat exchanger, comprising a first flow channel and a second flow channel that are not interconnected, specifically:

[0033] The first flow channel is used to flow the first medium; it has multiple parallel first flow sections 2 connected in sequence along the flow direction of the first medium; adjacent first flow sections 2 are connected by a first transition section 21.

[0034] Combination Figure 3The second flow channel is used for the flow of the second medium; it has multiple parallel second flow sections 3 connected in sequence along the flow direction of the second medium; adjacent second flow sections 3 are connected by a second transition section 31.

[0035] The first flow section 2 of the first flow channel and the second flow section 3 of the second flow channel are arranged in a cross-stacked manner, and the adjacent first flow section 2 and second flow section 3 are in surface contact to form a heat exchange connection; specifically, except for the flow section located on the outermost side, the two sides of each first flow section 2 are the second flow section 3, and the two sides of each second flow section 3 are the first flow section 2.

[0036] In this invention, different media flow through the first and second flow channels respectively. Since the flow sections of the two flow channels are stacked and cross-arranged in sequence, the media in the flow section of each flow channel can exchange heat with the media in the two flow sections of the opposite flow channel.

[0037] See Figure 2 and Figure 3 In the diagram, double arrows indicate the flow direction of the first medium, and single arrows indicate the flow direction of the second medium. During the flow process, both media can exchange heat with the media in the two adjacent opposing flow channels in any flow segment. With a fixed spatial volume, this increases the heat exchange contact area at the cutoff point of the flow path and the two flow channels, thereby improving heat exchange efficiency. This invention, through a structure where the flow segments of the two channels are sequentially stacked, makes full use of space, increasing the heat exchange area of ​​the two channels and improving heat exchange efficiency within a limited space.

[0038] Furthermore, a metal powder sintered layer is formed on the inner wall of the first and second flow channels. The large contact heat exchange area generated by the micro-porous structure in the metal powder sintered material improves the heat exchange effect.

[0039] Even better, the sintered metal powder layer is formed by sintering nano-metal powder, which has a large specific surface area and increases the heat transfer area. Preferably, the nano-metal powder is silver powder, which has good thermal conductivity and high heat transfer efficiency.

[0040] The serpentine flow channel heat exchanger of the present invention is used for dilution refrigeration, for example, a dense phase medium is introduced into the first flow channel and a dilute phase medium is introduced into the second flow channel.

[0041] As one embodiment of the serpentine flow channel heat exchanger of the present invention, it includes a housing 1, in which multiple layers of flow guide plates 13 are arranged in parallel; the upper and lower sides of each layer of flow guide plates 13 respectively form the first flow section 2 and the second flow section 3.

[0042] Combination Figure 4Inside the housing 1, from top to bottom, a transition zone is formed on one side of every two adjacent first flow sections 2 and second flow sections 3; the transition zone includes a first transition section 21 and a second transition section 31; inside the housing 1, from top to bottom, each transition zone is alternately formed on the left and right sides;

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

[0044] Inside the housing 1, from top to bottom, each layer of first flow section 2 is connected sequentially through a first transition section 21 to form the first flow channel; each layer of second flow section 3 is connected sequentially through a second transition section 31 to form the second flow channel.

[0045] The two ends of the first flow channel are respectively connected to a first medium pipe 11 disposed on the housing 1, and the two ends of the second flow channel are respectively connected to a second medium pipe 12 disposed on the housing 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] Different media flow on both sides of each layer of the guide plate 13, which increases the heat exchange area and efficiency, and achieves full heat exchange between the two media.

[0048] As one embodiment, the transition zone includes a vertically arranged partition plate 14; a first flow section 2 and a second flow section 3 are formed on both sides of the partition plate 14 respectively; when the two media flow through the transition zone, heat exchange is achieved through the partition plate 14, so that heat exchange occurs throughout the entire process of the media flowing in the channel, thereby improving the efficiency of heat exchange.

[0049] Furthermore, both the guide plate 13 and the partition plate 14 are formed with a sintered metal powder layer to improve heat exchange efficiency.

[0050] The guide plate 13 and the partition plate 14 of the present invention are both made of metal and have good thermal conductivity.

[0051] Optionally, the adjacent first flow section 2 and second flow section 3 of the transition zone have three layers of guide plates 13, and the partition plate 14 passes through the three layers of guide plates 13 in sequence along the longitudinal direction; more preferably, the partition plate 14 divides the guide plate 13 equally in the thickness direction, 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 rate and thickness of the transition section.

[0052] This invention increases the heat exchange area and efficiency by setting multiple layers of guide plates 13 inside the housing 1 to form two sequentially overlapping flow channels. The housing 1 has no moving parts and is connected to other equipment or components only through the first medium pipe 11 and the second medium pipe 12. The heat exchange process is vibration-free and suitable for operation in extremely low temperature environments.

[0053] See Figure 1 Depending on the actual usage scenario, the housing 1 of this invention can be placed vertically, and then combined with... Figure 6 and Figure 7 It can also be placed horizontally or horizontally.

[0054] See Figure 5 and Figure 7 As one embodiment, the serpentine flow channel heat exchanger has multiple housings 1, and each housing 1 is connected in series to achieve multi-stage heat exchange;

[0055] The first and second flow channels in each box 1 are connected sequentially along the flow direction of their respective media to form a series connection;

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

[0057] The present invention also provides a dilution refrigeration machine having the aforementioned serpentine flow channel heat exchanger.

[0058] In summary, this invention provides a serpentine flow channel heat exchanger with a structure in which the flow sections of two channels are stacked in a crisscross pattern. Different media flow in the first and second channels respectively. Because the flow sections of the two channels are stacked and crisscrossed, the media in each flow section can exchange heat with the media in the two flow sections of the opposite channel. This fully utilizes space, increases the heat exchange area of ​​the two channels, and improves the heat exchange efficiency. This invention also provides a dilution refrigerator with the aforementioned serpentine flow channel heat exchanger.

[0059] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

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 for flowing 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, the two sides of each first flow section are second flow sections, and the two sides of each second flow section are first flow sections. It also includes a housing, in 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; The transition zone includes a vertically arranged partition plate; a first transition section and a second transition section are formed on both sides of the partition plate, respectively.

2. The serpentine flow channel heat exchanger as described in claim 1, 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.

3. The serpentine flow channel heat exchanger as described in claim 1, characterized in that, Both the flow guide plate and the partition plate are formed with a sintered metal powder layer.

4. The serpentine flow channel heat exchanger as described in claim 3, characterized in that, The sintered metal powder layer is formed by sintering nano-metal powder.

5. The serpentine flow channel heat exchanger as described in claim 4, characterized in that, The nano-metal powder is silver powder.

6. The serpentine flow channel heat exchanger as described in claim 1, characterized in that, The enclosure consists of multiple units, which are connected in series sequentially.

7. The serpentine flow channel heat exchanger as described in claim 6, characterized in that, The boxes are connected in series in either the horizontal or vertical direction.

8. A dilution refrigeration machine, characterized in that, It has a serpentine flow channel heat exchanger as described in any one of claims 1 to 7.

Images