Alternating flow heat exchanger

Abstract

The application relates to the technical field of heat exchangers, and provides an alternating flow heat exchanger which comprises fin plates, a plurality of the fin plates are arranged at intervals along a first direction, and each of the fin plates is provided with a plurality of air flow holes; the application is characterized in that two adjacent fin plates are arranged at intervals, so that the gas entering the air flow hole cannot directly enter the adjacent air flow hole along the height direction, but diffuses to the surrounding and enters the gas flow channel, thereby forming a plurality of independent gas flow sections, and the inlet effect is generated when the gas flow in each section enters the air flow hole, so that the overall heat transfer efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchangers, in particular to an alternating flow heat exchanger. BACKGROUND

[0002] The alternating flow heat exchanger is a key component of the energy conversion system, and the heat transfer effect has an important influence on the efficiency of the system. At present, the alternating flow heat exchanger mainly adopts the traditional finned heat exchanger structure and the tube bundle heat exchanger structure.

[0003] However, due to the fact that the heat transfer coefficient of the gas side is smaller than that of the liquid phase heat transfer fluid by more than one order of magnitude, the heat transfer temperature difference of the gas side of the alternating flow heat exchanger is large, which further affects the heat transfer efficiency of the system and the performance of the whole machine. The existing measures to improve the heat transfer effect include increasing the heat transfer area or reducing the hydraulic diameter, etc. However, the current alternating flow heat exchanger gas side area has reached the limit, and the hydraulic diameter has approached the optimal value, and further reduction will increase the resistance loss, and cannot improve the overall efficiency. SUMMARY

[0004] The present application provides an alternating flow heat exchanger to solve the problem of poor and ineffective gas side heat transfer of the alternating flow heat exchanger in the prior art.

[0005] The present application provides an alternating flow heat exchanger, comprising:

[0006] A plurality of fin plates are provided, and the plurality of fin plates are arranged at intervals along a first direction. Each of the fin plates is provided with a plurality of airflow holes.

[0007] The alternating flow heat exchanger provided by the present application further comprises a partition plate arranged between two adjacent fin plates, and the partition plate partially overlaps with the fin plates, so as to form an interval between the regions where the airflow holes on the two adjacent fin plates are located. The inner side end of the partition plate and the space surrounded by the two adjacent fin plates form a gas flow channel, and the gas flow channel is in communication with the airflow holes.

[0008] According to the alternating flow heat exchanger provided by the present application, the airflow holes between the two adjacent fin plates are one-to-one corresponding.

[0009] According to the alternating flow heat exchanger provided by the present application, the airflow holes between the two adjacent fin plates are staggered.

[0010] The alternating flow heat exchanger provided by the application is characterized in that a support is arranged between two adjacent fin plates, and the support is connected to the inner side end of the fin plate.

[0011] The alternating flow heat exchanger provided by the application is characterized in that the fin plate and the partition plate are both annular structures, a plurality of airflow holes are arranged at the inner side of the fin plate at equal intervals in the circumferential direction, and the outer side end of the partition plate is located at the outer side of the fin plate.

[0012] The alternating flow heat exchanger provided by the application is characterized in that the airflow hole is a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the radial direction of the fin plate.

[0013] The alternating flow heat exchanger provided by the application is characterized in that the part of the partition plate located at the outer side of the fin plate forms a reinforcing fin on the side of the heat-carrying fluid.

[0014] The alternating flow heat exchanger provided by the application is characterized in that the thickness of the support is 0.5-5 mm.

[0015] The alternating flow heat exchanger provided by the application further comprises a sleeve and a plurality of circular tubes, the fin plate is arranged in each circular tube in the axial direction, a plurality of airflow holes are arranged on the fin plate in the circumferential direction, and the airflow holes on two adjacent fin plates are arranged alternately.

[0016] The alternating flow heat exchanger provided by the application is characterized in that two adjacent fin plates are arranged at intervals, and the gas entering the airflow hole of the application cannot continue to directly enter the adjacent airflow hole in the height direction, but will diffuse around, resulting in the formation of a plurality of independent airflow sections, and the inlet effect is generated when each airflow enters the airflow hole again, the heat transfer coefficient is significantly increased when the airflow enters the new airflow hole each time, thereby improving the overall heat transfer efficiency, helping to quickly and uniformly distribute the temperature of the fluid, reducing the unevenness of the temperature gradient, and the inlet effect also promotes more turbulence near the inlet, enhancing the contact between the fluid and the heat exchange surface, and further enhancing the heat transfer effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1This is a cross-sectional view of an alternating flow heat exchanger provided in an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of an alternating flow heat exchanger provided in another embodiment of the present invention.

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the alternating flow heat exchanger provided in an embodiment of the present invention.

[0021] Figure 4 This is a cross-sectional view of an alternating flow heat exchanger provided in another embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the internal structure of a circular tube provided in an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of an alternating flow heat exchanger in the prior art.

[0024] Figure label:

[0025] 1. Finned plate; 2. Baffle plate; 3. Gas flow channel; 4. Support component; 5. Liquid phase heat transfer fluid flow channel; 6. Sleeve; 7. Circular tube; 8. Airflow hole; 9. Heat exchange fins. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] like Figure 6 As shown, this is a conventional alternating flow heat exchanger in the prior art. Numerous heat exchange fins 9 are machined from a thermally conductive substrate using wire cutting. Gas channels 3 are formed between the radially arranged fins on the inner side. The working gas in the alternating flow heat-work conversion system is typically helium. A liquid phase heat transfer fluid channel 5 is arranged circumferentially on the outer side. There is usually a ring around the outer circumference of the alternating flow heat exchanger with inlets and outlets. The heat transfer fluid flows circumferentially along the liquid phase heat transfer fluid channel 5, entering from one side and exiting from the other. The heat exchange principle of this alternating flow heat exchanger is that the heat transfer fluid exchanges heat with the channel wall, transferring heat or cold to the fins, and then further to the working gas inside the system. Because the heat transfer coefficient between the working gas and the wall is relatively small, the gas-side heat exchange temperature difference is large, and the gas-side heat exchange performance of this alternating flow heat exchanger is not ideal.

[0028] The following is combined withFigures 1-5 An alternating flow heat exchanger is described.

[0029] The embodiment provides an alternating flow heat exchanger, which comprises fin plates 1, the fin plates 1 are provided with a plurality of fin plates 1, the plurality of fin plates 1 are arranged in a first direction, and the inner side of each fin plate 1 is provided with a plurality of airflow holes 8, wherein the first direction is a height direction, that is, the thickness direction of the fin plate 1.

[0030] According to the above scheme, there is a gap between the two fin plates 1, compared with the traditional scheme, the gas entering the airflow hole 8 cannot continue to directly enter the adjacent airflow hole 8 along the height direction, but will diffuse around, resulting in the formation of multiple independent airflow sections, and the inlet effect is generated when each airflow enters the airflow hole 8, the inlet effect makes the heat transfer coefficient increase significantly when the airflow enters the new airflow hole 8 each time, thereby improving the overall heat transfer efficiency, which helps to quickly and uniformly distribute the temperature of the fluid and reduce the unevenness of the temperature gradient, and the inlet effect also promotes more turbulence near the inlet, thereby enhancing the contact between the fluid and the heat exchange surface and further enhancing the heat transfer effect.

[0031] It should be noted that the inlet effect, also known as the Barus effect, refers to the phenomenon that the molten polymer or fluid changes the cross section of the pipeline and is oriented and elastically stored, which belongs to the prior art, and the principle does not belong to the focus of this paper, and will not be repeated here.

[0032] In some embodiments, a partition plate 2 is further included, the partition plate 2 is arranged between the adjacent two fin plates 1, and the partition plate 2 partially overlaps with the fin plate 1, so that the area where the airflow holes 8 on the adjacent two fin plates 1 are located is spaced, the inner side end of the partition plate 2 forms a gas flow channel 3 with the space surrounded by the adjacent two fin plates 1, and the gas flow channel 3 is communicated with the airflow hole 8.

[0033] In this way, the gas entering the airflow hole 8 cannot continue to directly enter the adjacent airflow hole 8 along the height direction, but will diffuse around into the gas flow channel 3, resulting in the formation of multiple independent airflow sections, and the inlet effect is generated when each airflow enters the airflow hole 8.

[0034] As shown in FIG. Figure 1 In some embodiments, the airflow holes 8 between the adjacent two fin plates 1 are one-to-one corresponding, after the adjacent two fin plates 1 are separated by the partition plate 2, the gas entering the airflow hole 8 cannot continue to directly enter the airflow hole 8 corresponding to the upper and lower airflow holes 8 along the height direction, but will diffuse around into the gas flow channel 3, thereby improving the heat exchange area and forming multiple independent airflow sections, and the inlet effect is generated when each airflow enters the airflow hole 8, thereby strengthening the heat transfer effect of the airflow.

[0035] In other embodiments, the air flow holes 8 between two adjacent fin plates 1 are staggered, as shown in the figure. Figure 2 As shown in the figure, after two adjacent fin plates 1 are separated by the partition plate 2, the staggered arrangement of the air flow holes 8 on the adjacent fin plates 1 further disturbs the flow channel and enhances the heat exchange effect.

[0036] In this embodiment, a support member 4 is arranged between two adjacent fin plates 1, and the support member 4 is connected to the inner side end of the fin plate 1. In this way, since the fluid flowing through the inner side of the fin plate 1 is mostly high-pressure gas, the arrangement of the support member can prevent the fin from being deformed and bent due to the impact of the gas flow, thereby improving the strength of the overall structure.

[0037] As shown in the figure, Figures 1-3 In this embodiment, the fin plate 1 and the partition plate 2 are both annular structures, and a plurality of air flow holes 8 are arranged at equal intervals along the circumferential direction on the inner side of the fin plate 1. Correspondingly, the support member 4 is a support ring, which is made of the same material as the fin plate 1 and has a thickness of 0.5-5 mm. The specific thickness is designed according to the size of the actual alternating flow heat exchanger. The materials of the fin plate 1, the partition plate 2, and the support member 4 are selected from materials with good thermal conductivity and mechanical strength, such as copper, stainless steel, and aluminum alloy.

[0038] Optionally, the air flow hole 8 is a strip-shaped hole, and the length direction of the strip-shaped hole is the same as the radial direction of the fin plate 1.

[0039] As shown in the figure, Figures 1-3 As shown in the figure, the outer side end of the partition plate 2 is located on the outer side of the fin plate 1, and the space surrounded by two adjacent partition plates 2 and the outer side end of the fin plate 1 forms a liquid-phase heat carrier flow channel 5 for the flow of the heat carrier. The heat carrier flows along the circumferential direction of the liquid-phase heat carrier flow channel 5, enters from one side of the circumference, and flows out from the other side. That is, the annular partition plate 2 and the annular fin plate 1 are arranged with the same center and are connected in a staggered manner, that is, the partition plate 2 and the fin plate 1 partially overlap, and the outer side end of the partition plate 2 is located on the outer side of the fin plate 1, and the inner side end of the partition plate 2 is located in the space between two adjacent fin plates 1, thereby achieving the spacing of the regions where the air flow holes 8 on two adjacent fin plates 1 are located. The inner side end of the partition plate 2 and the space surrounded by two adjacent fin plates 1 form a gas flow channel 3, which is in communication with each air flow hole 8. The outer side end of the fin plate 1 and the space surrounded by two adjacent outer partition plates 2 form a liquid-phase heat carrier flow channel 5. One side of the liquid-phase heat carrier flow channel 5 is provided with a liquid inlet, and the opposite side is provided with a liquid outlet, so that the heat carrier flows along the circumferential direction of the liquid-phase heat carrier flow channel 5, enters from one side of the circumference, and flows out from the other side.

[0040] Further, the fin plate 1 and the partition plate 2 are connected by welding, and the welding mode includes but is not limited to brazing, diffusion welding, etc., so as to ensure that the gas flow channel 3 and the heat carrier flow channel are not communicated, and the reliability of the sealed connection is improved, and the gas leakage phenomenon is avoided.

[0041] In the embodiment, the part of the partition plate 2 located outside the fin plate 1 forms the reinforced fin on the heat carrier side, so as to increase the heat exchange area and the heat exchange efficiency between the heat carrier and the heat carrier.

[0042] With reference to Figure 4 and Figure 5 , the embodiment of the present application further provides an alternating flow heat exchanger, which is a tube bundle heat exchanger and comprises a sleeve 6 and a plurality of circular tubes 7 arranged in the sleeve 6. A plurality of fin plates 1 are arranged in the circular tubes 7 in the axial direction. The fin plate 1 is circular, and the fin plate 1 can be welded with the inner wall of the circular tube 7. A plurality of gas flow holes 8 are arranged on each fin plate 1 in the circumferential direction. Each gas flow hole 8 extends in the radial direction, and the gas flow holes 8 on the adjacent two fin plates 1 are staggered. That is, the adjacent layer of fin plates 1 can be rotated by a certain angle, so that the gas flow holes 8 on the fin plates 1 in the layer are staggered, so that a plurality of independent gas flow sections can be formed. In operation, the gas flows in the circular tube 7, and the heat carrier flows in the sleeve 6 outside the circular tube 7. The inlet and outlet are arranged on the sleeve 6. The external fluid flows through the tube bundle and exchanges heat with the high-pressure gas working substance in the tube bundle, so as to release the heat or cold to the gas working substance.

[0043] In this way, by welding the fin plate 1 inside the circular tube 7, the gas side heat exchange area is increased, and the heat exchange effect is improved. By arranging the fin plates 1 in the interval and staggered, a plurality of independent flow channels are formed, the continuous flow of the gas flow in the axial direction is broken, the flow direction of the gas flow is changed every time the gas flow enters the next flow channel, the inlet effect is generated when the gas flow passes through each layer of fin plates 1, and the heat exchange effect is improved.

[0044] The present application utilizes the inlet effect to strengthen the heat transfer of the alternating flow heat exchanger. By arranging the fin plates 1 in the interval, the discontinuity between the fin flow channels is generated, the gas cannot continue to directly enter the adjacent gas flow hole 8 in the height direction, but will diffuse around into the gas flow channel 3, so that a plurality of independent gas flow sections are formed. The inlet effect is generated when each gas flow enters the gas flow hole 8, and the fin plates 1 can be arranged in the staggered manner, so as to further disturb the flow channel and enhance the heat exchange effect.

[0045] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An alternating flow heat exchanger, characterized in that, include: A plurality of finned plates (1) are provided, and the plurality of finned plates (1) are spaced apart along a first direction. Each finned plate (1) is provided with a plurality of airflow holes (8); the first direction is the thickness direction of the finned plate (1). It also includes a partition (2), which is disposed between two adjacent finned plates (1) and partially overlaps with the finned plates (1), so that the area where the airflow holes (8) are located on the two adjacent finned plates (1) is separated. The inner end of the partition (2) and the space enclosed by the two adjacent finned plates (1) form a gas flow channel (3), which is connected to the airflow holes (8). Both the finned plate (1) and the partition plate (2) are annular structures. Multiple airflow holes (8) are equally spaced along the circumferential direction on the inner side of the finned plate (1). The outer end of the partition plate (2) is located on the outer side of the finned plate (1). The space enclosed by two adjacent partition plates (2) and the outer end of the finned plate (1) forms a liquid phase heat transfer fluid channel (5) for the flow of heat transfer fluid.

2. The alternating flow heat exchanger according to claim 1, characterized in that, The airflow holes (8) between two adjacent fin plates (1) correspond one-to-one.

3. The alternating flow heat exchanger according to claim 1, characterized in that, The airflow holes (8) between two adjacent finned plates (1) are staggered.

4. The alternating flow heat exchanger according to claim 1, characterized in that, A support member (4) is provided between two adjacent fin plates (1), and the support member (4) is connected to the inner end of the fin plate (1).

5. The alternating flow heat exchanger according to claim 4, characterized in that, The airflow hole (8) is a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the radial direction of the fin plate (1).

6. The alternating flow heat exchanger according to claim 1, characterized in that, The portion of the partition (2) located outside the finned plate (1) forms a reinforced fin on the heat-carrying fluid side.

7. The alternating flow heat exchanger according to claim 4, characterized in that, The thickness of the support member (4) is 0.5-5mm.

8. The alternating flow heat exchanger according to claim 1, characterized in that, It also includes a sleeve (6) and a plurality of round tubes (7), wherein the finned plate (1) is arranged axially in each of the round tubes (7), and the airflow holes (8) on two adjacent finned plates (1) are staggered.

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