A counterflow heat exchanger and an air handling unit

Abstract

The utility model relates to heat exchanger technical field, the technical problem that the utility model wants to solve is low heat exchange efficiency. In order to solve the above technical problem, the utility model provides a countercurrent heat exchanger and air handling unit. The utility model includes: heat exchange module includes a plurality of side -by -side heat exchange group that sets up;Between two adjacent heat exchange groups is equipped with air passage;Heat exchange group includes a plurality of upper and lower sequentially connected tube plate unit;Tube plate single pipe is equipped with flow channel;The outer wall of tube plate single pipe is equipped with a plurality of fin;The cavity is equipped on the header body, and the transition hole plate is connected at the opening, and the transition hole plate is connected with the tube plate single pipe, and the hole site is butt joint with flow channel;The distribution main and the collecting main are connected at the diagonal position of heat exchange module;The distribution main and the collecting main are connected with the header body respectively;The distribution main, the cavity of one header component, flow channel, the cavity of another header component, the collecting main are sequentially communicated. The utility model improves heat exchange efficiency, and the cost is low, and reduces energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a counter-current heat exchanger and an air handling unit. Background Technology

[0002] Existing technology uses multi-row copper tube aluminum fin heat exchangers to achieve "countercurrent flow," where the tube-drain water flows repeatedly across the surface, organized from the tail to the head, forming a heat exchange process with the air flowing from the head to the tail. Its drawbacks are: 1. Compared to "pure countercurrent flow," multi-row tube countercurrent flow requires a larger heat exchanger, meaning the heat exchange efficiency is not yet ideal; 2. Multi-row tubes create greater flow resistance, leading to increased energy consumption. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a countercurrent heat exchanger, comprising: A heat exchange module includes multiple heat exchange groups arranged side by side; an air channel is provided between two adjacent heat exchange groups; each heat exchange group includes multiple tube sheet units connected vertically; each tube sheet unit includes a tube sheet body and header components connected to both ends of the tube sheet body; the tube sheet body includes multiple tube sheet tubes stacked vertically; each tube sheet tube has a flow channel; the outer wall of each tube sheet tube has multiple fins; the header component includes a header body, a transition orifice plate, a first plug, and a second plug; the header body has a cavity, an opening on one side, and interfaces at both ends; the transition orifice plate has multiple holes; the transition orifice plate is connected to the opening, and the transition orifice plate is connected to the tube sheet tube, with the holes aligning with the ends of the flow channels; one interface of the header body is connected to the first plug, and the other interface is connected to the second plug; The liquid distribution manifold and the liquid collection manifold are connected at opposite corners of the heat exchange module; the liquid distribution manifold and the liquid collection manifold are respectively connected to the header body; the liquid distribution manifold, the cavity and flow channel of one header component, the cavity of the other header component, and the liquid collection manifold are connected in sequence.

[0005] In one embodiment of this utility model, the tube sheet unit further includes multiple connecting joints; both ends of the connecting joints are provided with a first external thread and a second external thread; the thread directions of the first external thread and the second external thread are opposite; a first plug is provided with a first internal thread hole, and a second plug is provided with a second internal thread hole, the thread directions of the first internal thread hole and the second internal thread hole are opposite; the first external thread is connected to the first internal thread hole, and the second external thread is connected to the second internal thread hole.

[0006] In one embodiment of this utility model, the header body is an arc-shaped curved surface; the arc-shaped curved surface is a parabola, hyperbola or involute.

[0007] In one embodiment of this utility model, the cross-section of a single tube in the tube sheet is circular.

[0008] In one embodiment of this utility model, the cross-section of a single tube in the tube sheet is elliptical.

[0009] In one embodiment of this utility model, the inner wall of the tube sheet is provided with multiple ribs.

[0010] In one embodiment of this utility model, the application further includes a liquid supply system; the liquid supply system, the liquid distribution manifold, and the liquid collection manifold are connected.

[0011] In one embodiment of this utility model, this application is made of plastic material.

[0012] In one embodiment of this utility model, the application further includes two reinforcing main pipes, which are connected at the opposite diagonal position of the heat exchange module and are connected to the end of the manifold body.

[0013] This utility model also provides an air handling unit, comprising: The casing has an air inlet at the front and an air outlet at the rear. The fan is housed within the casing and positioned near the air inlet; The countercurrent heat exchanger in any of the above embodiments is disposed in the shell; Air enters the casing through the air inlet, and the fan drives the air to flow from front to back; after the air flows through the air passage of the counter-current heat exchanger for heat exchange, it is discharged from the air outlet.

[0014] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art: The counter-current heat exchanger and air handling unit described in this invention have an airflow direction that is parallel to and opposite to the liquid flow direction in the tube sheet, thereby improving heat exchange efficiency, reducing airflow resistance, and lowering the energy consumption of the counter-current heat exchanger. The tube sheet tubes of this application are also equipped with fins. On the one hand, the fins guide the air, ensuring that the airflow remains parallel to the liquid flow direction in the tube sheet as it passes through the air channel, further improving heat exchange efficiency; on the other hand, the fins enhance air turbulence outside the tube sheet unit, thereby enhancing the heat exchange effect. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of an air handling unit according to a preferred embodiment of the present invention; Figure 2yes Figure 1 The diagram shows the structure of the counter-current heat exchanger in the air handling unit. Figure 3 yes Figure 1 The diagram shows the structure of the heat exchange module in the air handling unit. Figure 4 yes Figure 1 The diagram shows the structure of the heat exchange unit in the air handling unit. Figure 5 yes Figure 1 An exploded view of the tube sheet unit in the air handling unit shown. Figure 6 yes Figure 1 An exploded view of the header components in the air handling unit shown; Figure 7 yes Figure 1 The exploded view of the header body, first plug, and second plug of the air handling unit shown; Figure 8 yes Figure 1 The diagram shows the structure of the transition orifice plate in the air handling unit. Figure 9 yes Figure 1 A schematic diagram of one embodiment of the tube sheet body in the air handling unit shown; Figure 10 yes Figure 1 A schematic diagram of another embodiment of the tube sheet body in the air handling unit shown; Figure 11 yes Figure 1 The diagram shows the structural diagram of the connecting joint in the air handling unit; Explanation of reference numerals in the accompanying drawings: 1000, casing; 2000, fan; 3000, counter-current heat exchanger; 4000, heat exchange module; 5000, air inlet; 6000, air outlet; 7000, heat exchange group; 8000, air passage; 100. Tube sheet unit; 110. Tube sheet body; 111. Tube sheet single tube; 112. Flow channel; 113. Fin; 114. Rib; 120. Manifold assembly; 121. Manifold body; 122. Transition orifice plate; 123. First plug; 124. Second plug; 125. Cavity; 126. Opening; 127. Interface; 128. Hole position; 130. Connecting joint; 131. First external thread; 132. Second external thread; 200, Distribution manifold; 300, Collection manifold; 400. Reinforce the main pipe. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0017] Reference Figures 1-11 As shown, this embodiment of the present invention provides an air handling unit, comprising: The system comprises a casing 1000, a fan 2000, and a counter-current heat exchanger 3000. The casing 1000 has an air inlet 5000 at its front end and an air outlet 6000 at its rear end. The fan 2000 is housed within the casing 1000 and positioned near the air inlet 5000. The counter-current heat exchanger 3000 is housed within the casing 1000 and positioned near the air outlet 6000. The counter-current heat exchanger 3000 includes: A heat exchange module 4000 includes multiple heat exchange groups 7000 arranged side by side; an air passage 8000 is provided between two adjacent heat exchange groups 7000; a heat exchange group 7000 includes multiple tube sheet units 100 connected vertically; a tube sheet unit 100 includes a tube sheet body 110 and a header component 120 connected to both ends of the tube sheet body 110; the tube sheet body 110 includes multiple tube sheet tubes 111 stacked vertically and multiple fins 113; a flow channel 112 is provided in the tube sheet tube 111; multiple fins 113 are provided on the outer wall of the tube sheet tube 111; the header component 120 includes a header body 121, a transition perforated plate 122, a first plug 123 and a second plug 124; the header body 121... The header 121 has a cavity 125, an opening 126 on one side, and interfaces 127 at its upper and lower ends. A transition orifice plate 122 has multiple holes 128. The transition orifice plate 122 is connected to the opening 126 and to the tube sheet single tube 111, with the holes 128 abutting the ends of the flow channels 112. One end of the header 121's interface 127 is connected to a first plug 123, and the other end's interface 127 is connected to a second plug 124. In some embodiments, at the opening 126, the header 121 is welded to one side of the transition orifice plate 122, and the other side of the transition orifice plate 122 is welded to the end of the tube sheet single tube 111. The first plug 123 and the second plug 124 are inserted into the interfaces 127 of the header 121 and welded to the header 121 as a single unit. In some possible embodiments, friction welding can be used. The first plug 123 and the second plug 124 have the same shape as the header body 121.

[0018] The liquid distribution manifold 200 and the liquid collection manifold 300 are connected at opposite corners of the heat exchange module 4000; the liquid distribution manifold 200 and the liquid collection manifold 300 are respectively connected to the header body 121; the liquid distribution manifold 200, the cavity 125 of one header component 120, the flow channel 112, the cavity 125 of the other header component 120, and the liquid collection manifold 300 are connected in sequence.

[0019] Air enters the housing 1000 through the air inlet 5000, and the fan 2000 drives the air to flow from front to back; after the air flows through the air passage 8000 of the counter-flow heat exchanger 3000 for heat exchange, it is discharged from the air outlet 6000.

[0020] Specifically, in this application, the airflow direction (from front to back) is parallel to and opposite to the liquid flow direction (from back to front) in the tube sheet 111, thereby improving heat exchange efficiency, reducing airflow resistance, and reducing the energy consumption of the counter-current heat exchanger 3000. The tube sheet 111 in this application is also provided with fins 113. On the one hand, the fins 113 guide the air, ensuring that the airflow remains parallel to the liquid flow direction in the tube sheet 111 when passing through the air channel 8000, further improving heat exchange efficiency; on the other hand, the fins 113 can enhance air turbulence outside the tube sheet unit 100, thereby enhancing the heat exchange effect.

[0021] Furthermore, the tube sheet unit 100 also includes a plurality of connecting joints 130; both ends of the connecting joints 130 are provided with a first external thread 131 and a second external thread 132; the thread directions of the first external thread 131 and the second external thread 132 are opposite; a first plug 123 is provided with a first internal thread hole, and a second plug 124 is provided with a second internal thread hole, the thread directions of the first internal thread hole and the second internal thread hole are opposite; the first external thread 131 is connected to the first internal thread hole, and the second external thread 132 is connected to the second internal thread hole.

[0022] Specifically, this embodiment is provided with a first external thread 131 and a second external thread 132 with opposite thread directions, so as to realize the rapid installation of two adjacent tube sheet units 100. Multiple tube sheet units 100 can be connected into a large sheet by using the connecting joint 130.

[0023] Furthermore, the curved surface can be a parabola, hyperbola, or involute.

[0024] Specifically, in this embodiment, parabolic, hyperbolic, involute and other arc-shaped surfaces are used as the shape of the header body 121. When air flows through the header body 121, the air flow resistance can be effectively reduced and the heat exchange effect can be further improved.

[0025] Further, the cross-section of the tube 111 in the tube sheet is circular. In some embodiments, the inner diameter of the tube 111 is 10 mm, the wall thickness is 1 mm, the thickness of the fin 113 is 1 mm, the length of the fin 113 is 3-5 mm, and the included angle between two adjacent fins 113 is 30°. The tube sheet body 110 includes 20-30 tubes 111, and the length of the tube sheet body 110 is 200-300 mm. The length of the transition perforated plate 122 is 330 mm, the width is 25-28 mm, and the diameter of the hole 128 is 5-8 mm.

[0026] Furthermore, the cross-section of the tube 111 in the tube sheet is elliptical. The shape of the orifice 128 is also elliptical. In some embodiments, the minor diameter of the tube 111 is 10 mm, the major diameter is 20 mm, and the wall thickness of the tube 111 is 1 mm. The thickness of the fin 113 is 1 mm, the length of the fin 113 is 3-5 mm, and the included angle between two adjacent fins 113 is 30°. The tube sheet body 110 includes 10-15 tubes 111, and the length of the tube sheet body 110 is 200-300 mm. The length of the transition orifice plate 122 is 330 mm, the width is 25-28 mm, and the diameter of the orifice 128 is 5-8 mm.

[0027] Specifically, circular and elliptical tube sheets 111 have different heat transfer capacities and different dynamic viscosity coefficients depending on the selected medium (water, ethylene glycol solution, etc.), thus allowing for the selection of the tube type with the best heat transfer effect (convective heat transfer). For example, when using ethylene glycol as the medium, a circular tube sheet 111 without fins 114 should be selected. When using water as the heat transfer medium, an elliptical tube sheet 111 should be selected.

[0028] Furthermore, the inner wall of the tube sheet 111 is provided with multiple ribs 114.

[0029] Specifically, the fins 114 inside the tube sheet body 110 are used to enhance fluid turbulence within the tube sheet body 110, thereby increasing turbulence, improving heat transfer capacity, and enhancing heat transfer effect. In addition, the fins 114 can also increase the heat transfer area.

[0030] Furthermore, this application also includes a liquid supply system; the liquid supply system, the liquid distribution manifold 200 and the liquid collection manifold 300 are connected.

[0031] Specifically, in this embodiment, the liquid supply system, the liquid distribution manifold 200, and the liquid collection manifold 300 form a heat exchange medium circulation.

[0032] In some comparative embodiments, metals are used. This consumes large amounts of non-ferrous metals (copper and aluminum), resulting in high costs; furthermore, non-ferrous metals have poor corrosion resistance, limiting their application in environments containing corrosive gases. To address these issues, this application uses plastic materials.

[0033] Specifically, in this embodiment, multiple stacked tube sheets 111 can be extruded using an injection molding machine, eliminating the need for subsequent processing, thus reducing process difficulty and costs. Furthermore, this embodiment uses plastic material instead of metal material, further reducing costs. Secondly, this embodiment exhibits high corrosion resistance, allowing for application in environments containing corrosive gases.

[0034] Furthermore, this application also includes two reinforced main pipes 400, which are connected at opposite diagonal positions of the heat exchange module 4000, and the reinforced main pipes 400 are connected to the end of the header body 121.

[0035] Specifically, in this embodiment, a reinforced main pipe 400 is used to provide stronger support for the counter-current heat exchanger 3000, making the structure of this application more stable. Thus, the reinforced main pipe 400 does not participate in the circulation of the medium, but through the connection between the reinforced main pipe 400 and the header body 121, the counter-current heat exchanger 3000 achieves higher overall strength.

[0036] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A counter-current heat exchanger, characterized in that: include: A heat exchange module includes multiple heat exchange groups arranged side by side; an air channel is provided between two adjacent heat exchange groups; each heat exchange group includes multiple tube sheet units connected vertically in sequence; each tube sheet unit includes a tube sheet body and header components connected to both ends of the tube sheet body; the tube sheet body includes multiple tube sheet tubes and multiple fins stacked vertically in sequence; each tube sheet tube has a flow channel; the outer wall of each tube sheet tube has multiple fins; the header component includes a header body, a transition orifice plate, a first plug, and a second plug; the header body has a cavity, an opening on one side, and interfaces at both ends; the transition orifice plate has multiple holes; the transition orifice plate is connected to the opening, the transition orifice plate is connected to the tube sheet tube, and the holes are aligned with the ends of the flow channels; one interface of the header body is connected to the first plug, and the other interface is connected to the second plug. The liquid distribution manifold and the liquid collection manifold are connected at diagonal positions of the heat exchange module; the liquid distribution manifold and the liquid collection manifold are respectively connected to the header body; the liquid distribution manifold, the cavity of one of the header components, the flow channel, the cavity of another header component, and the liquid collection manifold are connected in sequence.

2. The countercurrent heat exchanger according to claim 1, characterized in that: The tube sheet unit also includes multiple connecting joints; each connecting joint has a first external thread and a second external thread at both ends; the first external thread and the second external thread have opposite thread directions; the first plug has a first internal thread hole, and the second plug has a second internal thread hole, the first internal thread hole and the second internal thread hole have opposite thread directions; the first external thread is connected to the first internal thread hole, and the second external thread is connected to the second internal thread hole.

3. The countercurrent heat exchanger according to claim 1, characterized in that: The header body is an arc-shaped curved surface; the arc-shaped curved surface is a parabola, hyperbola or involute.

4. The countercurrent heat exchanger according to claim 1, characterized in that: The cross-section of each tube in the tube sheet is circular.

5. The countercurrent heat exchanger according to claim 1, characterized in that: The cross-section of each tube in the tube sheet is elliptical.

6. The countercurrent heat exchanger according to claim 1, characterized in that: The inner wall of each tube in the tube sheet is provided with multiple ribs.

7. The countercurrent heat exchanger according to claim 1, characterized in that: It also includes a liquid supply system; the liquid supply system is connected to the liquid distribution manifold and the liquid collection manifold.

8. The countercurrent heat exchanger according to claim 1, characterized in that: Made of plastic.

9. The countercurrent heat exchanger according to claim 8, characterized in that: It also includes two reinforced main pipes, which are connected to the opposite diagonal position of the heat exchange module and are connected to the end of the manifold body.

10. An air handling unit, characterized in that: include: The casing has an air inlet at the front and an air outlet at the rear. A fan is housed within the casing and positioned near the air inlet; The countercurrent heat exchanger according to any one of claims 1 to 9 is disposed in the housing; Air enters the housing through the air inlet, and the fan drives the air to flow from front to back; after the air flows through the air passage of the counter-current heat exchanger for heat exchange, it is discharged from the air outlet.

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