Three-medium heat exchanger

Abstract

A three-medium heat exchanger comprises a header and a sleeve type flat tube. Two headers are oppositely arranged, and a plurality of sleeve type flat tubes are arranged in parallel along the length direction of the headers between the two headers, and a third medium flow channel is defined between adjacent flat tubes. The interior of the header is divided into a first medium chamber and a second medium chamber along the height direction, and the first medium chamber faces the sleeve type flat tube. The sleeve type flat tube comprises an outer first flat tube and an inner folded flat tube, a first medium flow channel is formed between the first flat tube and the folded flat tube, a second medium flow channel is formed in the folded flat tube, and the two ends of the folded flat tube are provided with extensions extending outward in the axial direction. The two ends of the first medium flow channel are in communication with the first medium chamber, the second medium flow channel is in communication with the second medium chamber through the extensions, and the two medium chambers are connected with external pipelines, so that the three mediums can be efficiently exchanged in the compact heat exchanger, the structural layout is clear, the flow channels are independent through the sleeve type flat tube, and the heat exchange efficiency is high.

Description

Technical Field

[0001] This utility model relates to the technical field of three-medium heat exchangers, specifically a three-medium heat exchanger. Background Technology

[0002] A three-medium heat exchanger is a composite heat exchange device that enables heat exchange between three different fluid media in pairs. It is widely used in automotive thermal management, energy conversion, and refrigeration.

[0003] In existing technologies, the heat exchanger structure for three media mainly includes two manifolds and multiple flat tube groups. Each flat tube group consists of a first-medium flat tube and a second-medium flat tube fitted together, defining the first-medium flow channel and the second-medium flow channel respectively. Adjacent flat tube groups form a flow channel region for the third-medium flow. The manifolds are connected to the bent ends of each flat tube through insertion holes to facilitate the inlet and outlet flow of the three media.

[0004] However, the above structure has the following shortcomings in actual production and application: First, the first flat tube and the second flat tube need to be fitted together for assembly. The ends are provided with bent sections that move away from the fitting surface to connect the manifold. The overall structure is complex, the assembly precision requirements are high, and the processing and welding processes are difficult.

[0005] Secondly, the manifold has a complex structure and requires brazing for sealing. The insertion parts need to be fixed by welding at multiple points, which is complicated, has high manufacturing costs, and is prone to stress concentration and sealing leakage risks.

[0006] To address the aforementioned issues, there is an urgent need to develop a novel three-medium heat exchanger that is simple to manufacture and has a more streamlined assembly process, thereby improving manufacturing efficiency and enhancing reliability. Summary of the Invention

[0007] This utility model addresses the shortcomings of existing technologies by proposing a three-medium heat exchanger, the specific technical solution of which is as follows: A three-medium heat exchanger, comprising a manifold and a sleeved flat tube, characterized in that: The two manifolds are arranged opposite each other, and multiple sleeved flat tubes are arranged parallel to each other along the length of the manifolds between the two manifolds, and a third medium flow channel is defined between adjacent sleeved flat tubes; The manifold includes a first medium chamber and a second medium chamber that are separated along the height, with the first medium chamber facing the sleeved flat tube. The sleeved flat tube includes a first flat tube and a folded flat tube. The interior of the folded flat tube defines a second medium flow channel. The first flat tube is sleeved on the outside of the folded flat tube. The first flat tube and the folded flat tube define a second medium flow channel. The two ends of the folded flat tube are provided with extensions extending outward along the axial direction. The two ends of the first medium flow channel are respectively connected to the corresponding first medium chamber, and the two ends of the second medium flow channel are connected to the second medium chamber through the extension portion; The first medium chamber and the second medium chamber are respectively connected to external fluid pipelines.

[0008] To better realize this new utility model, it can be further: The first flat tube has a flat rectangular cross-section, and symmetrically arranged outwardly convex arc-shaped portions are provided on both sides of the width direction of the first flat tube.

[0009] Furthermore: The second medium flow channel is provided with folded fins along the width direction of the folded tube; The crests of the folded fins are attached to the upper inner wall of the folded tube, and the troughs are attached to the lower inner wall, so as to divide the second medium flow channel into multiple independent flow equalization channels.

[0010] Furthermore, the two ends of the first medium flow channel are respectively connected to the corresponding first insertion hole, and the extended portions of the two ends of the second medium flow channel are respectively connected to the corresponding second insertion hole.

[0011] Furthermore: the two manifolds are designated as the first manifold and the second manifold, respectively; The first manifold includes a first outer shell and a first inner shell, and the second manifold includes a second outer shell and a second inner shell; The first inner shell has a first medium inlet, the second inner shell has a second medium outlet, and the interior of the first inner shell defines a first medium chamber; The first outer shell has two partition plates along its length inside, which sequentially divide the first medium flow channel into a first flow channel, a second flow channel and a third flow channel. The second outer shell also has two partition plates inside, which sequentially divide the first medium flow channel into the fourth flow channel, the fifth flow channel and the sixth flow channel. The fourth flow channel and the fifth flow channel are connected through the drying cylinder. The first flow channel is provided with a second medium inlet, and the third flow channel is provided with a second medium outlet.

[0012] Furthermore: the first inner shell has a cuboid structure and an opening on one side; The sealing surface of the first inner shell faces the sleeve-type flat tube, and the sealing surface of the first inner shell is provided with a plurality of first insertion holes along the length direction; The first outer shell has an outer contour that matches the opening of the first inner shell and is inserted into the first inner shell to form a nested fit structure with the first inner shell. The interior of the first outer shell defines a second medium chamber. The first outer shell has a mounting surface that is disposed opposite to the closed surface of the first inner shell. The mounting surface is provided with second insertion holes that correspond one-to-one with the first insertion hole.

[0013] Furthermore, the first flow channel and the fourth flow channel have the same length, and the first flow channel and the second flow channel are connected by a single-layer flat tube.

[0014] Furthermore, the mating structure between the second inner shell and the second outer shell is the same as the mating structure between the first inner shell and the first outer shell.

[0015] The beneficial effects of this utility model are as follows: First, this utility model sets up nested inner and outer shells in the manifold to define the first medium chamber and the second medium chamber respectively, so that the first medium flow channel and the second medium flow channel are independent of each other, the fluid path is clear, cross-contamination between media is avoided, the sealing performance and heat exchange efficiency of the structure are enhanced, and it is also convenient for processing and maintenance.

[0016] Second, the first manifold and the second manifold are connected by multiple sleeved flat tubes. The sleeved flat tubes include an inner and outer folded flat tube and a first flat tube. The inner and outer flat tubes define a second medium flow channel. The folded flat tubes are provided with folded fins, which can divide the flow channel into multiple uniform flow channels, thereby effectively improving the flow uniformity and heat exchange area of ​​the second medium, enhancing the heat exchange efficiency, and reducing the thermal stress caused by local temperature differences.

[0017] Third, both the first and second outer shells are equipped with three flow channel structures separated along the height direction, forming multiple serial flow paths. In particular, the second medium circulates sequentially through the first flow channel, single-layer flat tube, fourth flow channel, drying cylinder, and fifth flow channel, which not only realizes the heat exchange of the medium in multiple temperature zones but also improves the fluid cleanliness through the filtration structure in the middle section, making it suitable for working conditions with high requirements for heat exchange purity.

[0018] Fourth, the folded flat tube is equipped with folded fins, and the crests and troughs are respectively attached to the upper and lower inner walls to divide the second medium flow channel into multiple independent flow equalization channels. This can effectively suppress the flow deviation of the fluid in the lateral direction and improve the uniformity of fluid distribution across the entire cross section. Attached Figure Description

[0019] Figure 1 This is the first structural diagram of the present utility model; Figure 2 This is the second structural diagram of the present invention; Figure 3 for Figure 2 AA section view; Figure 4 for Figure 3 A magnified view from direction B; Figure 5 This is the first structural diagram of the first manifold; Figure 6 This is a second structural diagram of the first manifold; Figure 7 for Figure 5 A magnified view in direction D; Figure 8 for Figure 6 CC section view; Figure 9 This is the first structural diagram of the sleeved flat tube; Figure 10 This is the second structural diagram of the sleeved flat tube; Figure 11 for Figure 9 A magnified view from direction B; The attached diagrams are as follows: 1. First manifold 2. Second manifold 3. Sleeve-type flat tube 4. Single-layer flat tube 5. First inner shell 6. First outer shell 7. Second inner shell 8. First medium inlet 9. First medium outlet 10. Second medium inlet 11. Second medium outlet 12. Sealing surface 13. Assembly surface 14. Partition plate 15. Flange 16. Side plate 17. First insertion hole 18. Second insertion hole 19. First flow channel 20. Second flow channel 21. Third flow channel 22. Fourth flow channel 23. Fifth flow channel 24. Sixth flow channel 25. Sealing cap 26. First flat tube 27. Folded flat tube 28. First medium flow channel 29. Second medium flow channel 30. Folded fin 31. Flow equalization channel 32. Rib 33. Drying cylinder 34. First medium chamber 35. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] like Figures 1 to 11 As shown: A three-medium heat exchanger includes a manifold and a sleeved flat tube 3. Two manifolds are arranged opposite each other, and multiple sleeved flat tubes 3 are arranged parallel to each other along the length of the manifolds between the two manifolds. A third medium flow channel is defined between adjacent sleeved flat tubes 3, and a heat dissipation strip is welded in the third medium flow channel.

[0023] For ease of description, the two manifolds are referred to as the first manifold 1 and the second manifold 2, respectively.

[0024] The first manifold 1 includes a first inner shell 5 and a first outer shell 6. The first inner shell 5 has a cuboid structure and an open surface on one side. The closed surface 13 is provided with a plurality of first insertion holes 18 along the length direction, and the interior of the inner shell defines a first medium chamber 35.

[0025] The outer contour of the first outer shell 6 mates with the opening surface of the first inner shell 5, and is inserted into the first inner shell 5 to form a nested mating structure. The interior of the first outer shell 6 defines a second medium chamber, and is provided with a second insertion hole 19 located at a position corresponding to the first insertion hole 18.

[0026] The second manifold 2 includes a second inner shell 7 and a second outer shell 8. The structure and connection method of the second inner shell 7 and the second outer shell 8 are the same as those of the first inner shell 5 and the first outer shell 6.

[0027] The interior of the first outer shell 6 is provided with two partition plates 15 along the length direction, which sequentially divide the flow channel of the second medium chamber into a first flow channel 20, a second flow channel 21 and a third flow channel 22 along the height direction.

[0028] The second outer shell 8 is also provided with two partition plates 15, which divide the second medium chamber into a fourth flow channel 23, a fifth flow channel 24 and a sixth flow channel 25 in sequence along the height direction. The fourth flow channel 23 and the fifth flow channel 24 are connected through the drying cylinder 34.

[0029] The first flow channel 20 and the fourth flow channel 23 have the same length, and the second flow channel 21 has a longer length than the fourth flow channel 23.

[0030] The first flow channel 20 and the fourth flow channel 23 are connected by a single-layer flat tube 4. A heat dissipation strip is also welded in the third medium flow channel between the adjacent single-layer flat tube 4 and the adjacent single-layer flat tube 4 and the sleeved flat tube 3. The first inner shell has a first medium inlet 9 and the second inner shell has a second medium outlet 12.

[0031] The first outer shell is provided with a second medium inlet 11 that communicates with the first flow channel 20 and a second medium inlet 11 that communicates with the third flow channel 22.

[0032] The sleeved flat tube 3 includes a first flat tube 27 and a folded flat tube 28. The first flat tube 27 is sleeved on the outside of the first flat tube 27. The folded flat tube 28 and the first flat tube 27 define a first medium flow channel. The length of the folded flat tube 28 is greater than the length of the first flat tube 27.

[0033] The folded flat tube 28 has a flat rectangular cross-section, and the interior of the folded flat tube 28 defines a second medium flow channel 30. Folded fins 31 are provided in the second medium flow channel 30 along the width direction of the flat tube body.

[0034] The crests of the folded fin 31 are attached to the upper inner wall of the folded flat tube 28, and the troughs are attached to the lower inner wall, so as to divide the second medium flow channel 30 into multiple independent flow equalization channels 32.

[0035] The two ends of the first medium flow channel 29 are respectively connected to the first medium chamber 35 on the corresponding side. The two end faces of the second medium flow channel 30 are provided with outwardly extending extensions. The extensions are inserted into the second insertion hole 19 connected to the second medium chamber on the corresponding side to realize the smooth entry and exit of the second medium.

[0036] The working principle of this utility model is as follows: After the first medium enters the first medium chamber 35 from the first medium inlet 9 on the first manifold 1, it is transported to the first medium outlet 10 on the second manifold 2 through the first medium flow channel 29 in the sleeved flat tube 3, forming a circulation path for the first medium.

[0037] The second medium first enters the first flow channel 20 from the second medium inlet 11 on the first manifold 1, and then enters the fourth flow channel 23 in the second manifold 2 through the connected single-layer flat tube 4. After entering the fourth flow channel 23 in the second manifold 2, the second medium enters the fifth flow channel 24 through the drying cylinder 34, returns to the second flow channel 21 in the first manifold 1 through the second medium flow channel 30, and continues to enter the sixth flow channel 25 in the second manifold 2. Finally, it returns to the third flow channel 22 in the first manifold 1 and is discharged from the second medium outlet 12 located in the third flow channel 22, thus forming a segmented circulation path composed of multiple flow channel segments.

[0038] The third medium flows laterally along the third medium flow channel formed between the sleeved flat tubes 3, and exchanges heat with the first medium and the second medium inside the sleeved flat tubes 3 respectively.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-medium heat exchanger, comprising a manifold and a sleeved flat tube, characterized in that: The two manifolds are arranged opposite each other, and multiple sleeved flat tubes are arranged parallel to each other along the length of the manifolds between the two manifolds, and a third medium flow channel is defined between adjacent sleeved flat tubes; The manifold includes a first medium chamber and a second medium chamber that are separated along the height, with the first medium chamber facing the sleeved flat tube. The sleeved flat tube includes a first flat tube and a folded flat tube. The interior of the folded flat tube defines a second medium flow channel. The first flat tube is sleeved on the outside of the folded flat tube. The first flat tube and the folded flat tube define a first medium flow channel. The two ends of the folded flat tube are provided with extensions extending outward along the axial direction. The two ends of the first medium flow channel are respectively connected to the corresponding first medium chamber, and the two ends of the second medium flow channel are connected to the second medium chamber through the extension portion; The first medium chamber and the second medium chamber are respectively connected to external fluid pipelines.

2. The three-medium heat exchanger according to claim 1, characterized in that: The first flat tube has a flat rectangular cross-section, and symmetrically arranged outwardly convex arc-shaped portions are provided on both sides of the width direction of the first flat tube.

3. A three-medium heat exchanger according to claim 2, characterized in that: The second medium flow channel is provided with folded fins along the width direction of the folded tube; The crests of the folded fins are attached to the upper inner wall of the folded tube, and the troughs are attached to the lower inner wall, so as to divide the second medium flow channel into multiple independent flow equalization channels.

4. A three-medium heat exchanger according to claim 3, characterized in that: The two ends of the first medium flow channel are respectively connected to the corresponding first insertion hole, and the extended portions of the two ends of the second medium flow channel are respectively connected to the corresponding second insertion hole.

5. A three-medium heat exchanger according to claim 4, characterized in that: The two manifolds are designated as the first manifold and the second manifold. The first manifold includes a first outer shell and a first inner shell, and the second manifold includes a second outer shell and a second inner shell; The first inner shell has a first medium inlet, the second inner shell has a second medium outlet, and the interior of the first inner shell defines a first medium chamber; The first outer shell has two partition plates along its length inside, which sequentially divide the first medium flow channel into a first flow channel, a second flow channel and a third flow channel. The second outer shell also has two partition plates inside, which sequentially divide the first medium flow channel into the fourth flow channel, the fifth flow channel and the sixth flow channel. The fourth flow channel and the fifth flow channel are connected through the drying cylinder. The first flow channel is provided with a second medium inlet, and the third flow channel is provided with a second medium outlet.

6. A three-medium heat exchanger according to claim 5, characterized in that: The first inner shell has a rectangular parallelepiped structure and an opening on one side. The sealing surface of the first inner shell faces the sleeve-type flat tube, and the sealing surface of the first inner shell is provided with a plurality of first insertion holes along the length direction; The first outer shell has an outer contour that matches the opening of the first inner shell and is inserted into the first inner shell to form a nested fit structure with the first inner shell. The interior of the first outer shell defines a second medium chamber. The first outer shell has a mounting surface that is disposed opposite to the closed surface of the first inner shell. The mounting surface is provided with second insertion holes that correspond one-to-one with the first insertion hole.

7. A three-medium heat exchanger according to claim 6, characterized in that: The first flow channel and the fourth flow channel have the same length, and the first flow channel and the second flow channel are connected by a single-layer flat tube.

8. A three-medium heat exchanger according to claim 7, characterized in that: The mating structure between the second inner shell and the second outer shell is the same as the mating structure between the first inner shell and the first outer shell.

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