Heat exchanger and method of manufacturing the same

Abstract

The present application relates to a kind of heat exchangers, including shell, first tube plate and second tube plate are arranged at intervals in the shell, shell is divided into first cavity, second cavity and third cavity by first tube plate and second tube plate, a plurality of first heat exchange tubes are provided in second cavity, first cavity, a plurality of first heat exchange tubes, third cavity for the flow of first medium;Header assembly, the header assembly is provided in second cavity, including two baffle plates, baffle plate is provided with header pipe at two ends respectively, a plurality of second heat exchange tubes are provided between two baffle plates, the two ends of a plurality of second heat exchange tubes are communicated with header pipe respectively, the header pipe, a plurality of second heat exchange tubes for the flow of second medium, a plurality of first heat exchange tubes are distributed on the two sides of header assembly;The space in second cavity, a plurality of first heat exchange tubes and a plurality of second heat exchange tubes outside is for the flow of third medium.The present application can form turbulent flow using the temperature difference of different medium itself and spontaneously carry out heat exchange.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically a heat exchanger and its manufacturing method. Background Technology

[0002] A tubular heat exchanger is an indirect heat exchanger that uses the wall of a tube bundle enclosed in a shell as the heat transfer surface. During operation, two different media for heat exchange flow inside and outside the tube bundle, respectively.

[0003] Patent CN117906413A discloses a tubular heat exchanger, including tube heads on both sides, a central tube shell, and an internal tube bundle and two sets of double tube sheets. The double tube sheets include a first tube sheet and a second tube sheet arranged in parallel. The first tube sheet is located near the tube heads. The tube bundle includes several pipes, which are arranged along the length of the tube shell inside the tube shell. Both ends of the pipes pass through a set of double tube sheets and are fixedly connected to the two tube sheets through their protruding ends relative to the first and second tube sheets. The tube heads on both sides and the two first tube sheets respectively form a first cavity, and the space inside the two first cavities and the tube bundle is used for the flow of a first medium. The central tube shell, the space between the two second tube sheets, and the outside of the tube bundle form a second cavity, and the space inside the second cavity is used for the flow of a second medium.

[0004] The aforementioned tubular heat exchangers require additional equipment such as water pumps to apply pressure and force the medium outside the tube bundle to flow for heat exchange, which increases the operating cost of the equipment. In addition, a single device can only use one low-temperature medium to cool another high-temperature medium at a time, resulting in low efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a heat exchanger and a method for manufacturing the same, so as to solve the above-mentioned problems.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] A heat exchanger, comprising at least,

[0008] The shell contains a first tube sheet and a second tube sheet spaced apart along its length. The shell is divided into a first cavity, a second cavity, and a third cavity by the first and second tube sheets. The second cavity is located between the first cavity and the third cavity. A plurality of hollow first heat exchange tubes are disposed in the second cavity. One end of each of the first heat exchange tubes is fixedly connected to the first tube sheet and communicates with the first cavity, while the other end is fixedly connected to the second tube sheet and communicates with the third cavity. The first cavity, the plurality of first heat exchange tubes, and the third cavity are supplied with a first medium.

[0009] A header assembly is disposed within a second cavity and includes two partitions arranged parallel to each other along the length of the shell. The two partitions form an upper opening and a lower opening. A header pipe is disposed at each end of the partitions. A plurality of hollow second heat exchange tubes are disposed between the two partitions. The two ends of the plurality of second heat exchange tubes are respectively connected to the header pipes. The header pipes and the plurality of second heat exchange tubes are supplied with a second medium. A plurality of first heat exchange tubes are distributed on both sides of the header assembly.

[0010] The space inside the second cavity, outside the plurality of first heat exchange tubes and the plurality of second heat exchange tubes, is supplied with a third medium for flow. The temperature of the second medium is higher than the temperature of the first medium, and the temperature of the first medium is higher than the temperature of the third medium.

[0011] In a preferred embodiment, the partition includes a first partition, a second partition, and a third partition arranged along the length of the shell. One end of the first partition, both ends of the second partition, and one end of the third partition are respectively provided with an oblong hole. The oblong holes of the first partition and the oblong holes at one end of the second partition are connected by bolts, and the oblong holes at the other end of the second partition and the oblong holes of the third partition are connected by bolts.

[0012] In a preferred embodiment, a third tube sheet is provided between the partition and the header pipe, and the end of the second heat exchange tube passes through the third tube sheet and is connected to the header pipe.

[0013] In a preferred embodiment, a plurality of dummy tubes are provided on the side of the partition away from the second heat exchange tube.

[0014] In a preferred embodiment, the dummy tube includes a first dummy tube and a second dummy tube that are nested together. The end of the first dummy tube away from the second dummy tube is fixedly connected to a third tube sheet, and the end of the second dummy tube away from the first dummy tube is fixedly connected to a second partition plate. The first dummy tube and the second dummy tube can be relatively displaced along the axial direction.

[0015] In a preferred embodiment, the bottom of the manifold assembly is provided with a plurality of support portions, each support portion having four support legs arranged in a rectangular pattern.

[0016] In a preferred embodiment, a plurality of support rods are provided between the two partitions, and the two ends of the plurality of support rods are respectively fixedly connected to the partitions.

[0017] In a preferred embodiment, at least two support plates are provided in the second cavity. The support plates are composed of several round steel bars welded together and are supported and fixed by several tie rods. The two ends of the tie rods are respectively fixedly connected to the first tube plate and the second tube plate.

[0018] In a preferred embodiment, the housing includes a first pipe head and a second pipe head located at both ends, and a middle housing located in the middle. The first pipe head is provided with a first inlet communicating with a first cavity, the second pipe head is provided with a first outlet communicating with a third cavity, and the middle housing is provided with a second inlet communicating with one of the manifold pipes, a second outlet communicating with another manifold pipe, a third inlet communicating with the second cavity, and a third outlet. The housing is placed at an angle, and an observation hole for observation is provided on the housing.

[0019] The present invention also includes a method for manufacturing a heat exchanger, comprising:

[0020] Step A: Place the middle section of the casing separately;

[0021] Step B: Place the assembled header assembly into the designated position inside the central housing;

[0022] Step C: Weld the first tube sheet to the designated position;

[0023] Step D: Weld one end of several tie rods to the first tube sheet;

[0024] Step E: Weld the support plate from the other end of the first tube sheet welded to the middle tube shell, pass it through the tie rod, and fix it to the corresponding position;

[0025] Step F: Pass several first heat exchange tubes sequentially through the first tube sheet and the support plate;

[0026] Step G: Weld the second tube sheet to the middle of the tube shell, place the other end of the first tube sheet into the designated position, and make the other end of the first heat exchange tube pass through the second tube sheet, and then weld the second tube sheet.

[0027] Step H: Weld both ends of the first heat exchange tube to the first tube sheet and the second tube sheet respectively;

[0028] Step 1: Install the first and second tube heads at both ends of the middle tube shell.

[0029] Compared with the prior art, the heat exchanger of this embodiment has the following advantages:

[0030] 1) The first medium flows in the first cavity, several first heat exchange tubes, and the third cavity. The second medium flows in the header pipe and several second heat exchange tubes. The third medium flows in the space outside the second cavity, several first heat exchange tubes, and several second heat exchange tubes. Since the temperature of the second medium is higher than that of the first medium, and the temperature of the first medium is higher than that of the third medium, when the two partitions are arranged in parallel, an upper opening and a lower opening will be formed. Due to the temperature difference with other media, the third medium will spontaneously form a circulating turbulent flow from the upper opening to the second cavities on both sides of the header assembly, and then flow back into the header assembly from the lower opening. The turbulent flow formed when the third medium flows will contact the first heat exchange tubes and the second heat exchange tubes, thereby causing heat exchange. No additional external pressure is required to exchange heat with the first medium and the second medium.

[0031] 2) One heat exchanger can supply three media to flow. The lower temperature third medium can exchange heat with the higher temperature first and second media at the same time, satisfying the cooling of two high temperature media at one time, and the working efficiency is higher. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a half-section of the heat exchanger in this embodiment;

[0033] Figure 2 This is a schematic diagram of the fracture structure of the heat exchanger header assembly in this embodiment;

[0034] Figure 3 This is a schematic diagram of the overall structure of the heat exchanger header assembly in this embodiment;

[0035] Figure 4 This is a top view of the heat exchanger header assembly in this embodiment;

[0036] Figure 5 This is a partial structural diagram of the heat exchanger header assembly in this embodiment;

[0037] Figure 6 This is a schematic diagram of the heat exchanger support portion along the length of the shell in this embodiment;

[0038] Figure 7 This is a schematic diagram of the cross-sectional structure of the heat exchanger along the length of the shell in this embodiment;

[0039] Figure 8 This is a schematic diagram of the planar structure of the heat exchanger support plate in this embodiment;

[0040] Figure 9 This is a schematic diagram of the planar structure of the heat exchanger in this embodiment after the support plate is added, along the length of the shell.

[0041] Figure 10 This is a cross-sectional view of the connection between the first tube sheet and the first heat exchange tube in this embodiment.

[0042] Explanation of reference numerals in the attached drawings: 10-Shell, 11-First tube sheet, 12-Second tube sheet, 13-First cavity, 14-Second cavity, 15-Third cavity, 16-First heat exchange tube, 20-Manipulator assembly, 21-Baffle plate, 22-Manipulator pipe, 23-Second heat exchange tube, 24-Support, 25-Support rod, 26-Third tube sheet, 27-First dummy tube, 28-Second dummy tube, 29-Support plate, 30-Tie rod, 101-First tube sheet 102-Second pipe head, 103-Middle pipe shell, 104-First inlet, 105-First outlet, 106-Second inlet, 107-Second outlet, 108-Third inlet, 109-Third outlet, 110-Observation hole, 201-Upper opening, 202-Lower opening, 211-First partition, 212-Second partition, 213-Third partition, 214-Oval hole, 241-Support foot, A-Welding point. Detailed Implementation

[0043] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the mechanism 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 invention.

[0045] like Figure 1 As shown, in order to make the view as clear as possible, Figure 1 The heat exchanger shown is a view after being rotated 90°. In actual use... Figure 1 The left side is placed on the ground. The heat exchanger of this embodiment includes an outer shell 10, and a first tube sheet 11 and a second tube sheet 12 are arranged at intervals along the length of the shell 10. For clarity, the first tube sheet 11 and the second tube sheet 12 are only represented by lines in the figure, but they actually have thickness.

[0046] The housing 10 is divided into three independent cavities: a first cavity 13, a second cavity 14, and a third cavity 15, by a first tube sheet 11 and a second tube sheet 12. The second cavity 14 is located between the first cavity 13 and the third cavity 15, and contains a plurality of hollow first heat exchange tubes 16. For clarity, the first heat exchange tubes 16 are represented by lines in the figure, but they are actually hollow tubular structures. One end of each of the first heat exchange tubes 16 is fixedly connected to the first tube sheet 11 and communicates with the first cavity 13, while the other end is fixedly connected to the second tube sheet 12 and communicates with the third cavity 15. The first cavity 13, the plurality of first heat exchange tubes 16, and the third cavity 15 are supplied with the flow of a first medium.

[0047] For ease of assembly, the housing 10 includes a first tube head 101 and a second tube head 102 located at both ends and a middle tube housing 103 located in the middle. The first tube head 101 is provided with a first inlet 104 communicating with the first cavity 13, and the second tube head 102 is provided with a first outlet 105 communicating with the third cavity 15.

[0048] The second cavity 14 is equipped with a manifold assembly 20. For example... Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the manifold assembly 20 includes two partitions 21 arranged parallel to each other along the length of the housing 10. The two partitions 21 form an upper opening 201 and a lower opening 202. Manifold pipes 22 are respectively provided at both ends of the partitions 21, and a plurality of hollow second heat exchange tubes 23 are arranged between the two partitions 21. For clarity, the second heat exchange tubes 23 are only represented by lines in the figure, but they are actually hollow tubular structures.

[0049] like Figure 1 As shown, the central tube shell 103 is provided with a second inlet 106 communicating with one of the header pipes 22 and a second outlet 107 communicating with the other header pipe 22. Both ends of a plurality of second heat exchange tubes 23 are respectively connected to the header pipes 22, and the header pipes 22 and the plurality of second heat exchange tubes 23 supply the flow of a second medium. A plurality of first heat exchange tubes 16 are distributed on both sides of the header assembly 20.

[0050] like Figure 1As shown, the central tube shell 103 is further provided with a third inlet 108 and a third outlet 109 communicating with the second cavity 14. The space inside the second cavity 14 and outside the plurality of first heat exchange tubes 16 and the plurality of second heat exchange tubes 23 is used for the flow of a third medium. The temperature of the second medium is higher than that of the first medium, and the temperature of the first medium is higher than that of the third medium. By utilizing the flow of the third medium, it comes into contact with the first heat exchange tubes 16 and the second heat exchange tubes 23, thereby exchanging heat with the second and first media and achieving cooling of the second and first media.

[0051] like Figure 2 As shown, the partition 21 includes a first partition 211, a second partition 212, and a third partition 213 arranged along the length of the shell 10. One end of the first partition 211, both ends of the second partition 212, and one end of the third partition 213 are respectively provided with oblong holes 214. The oblong holes 214 of the first partition 211 and one end of the second partition 212 are connected by bolts, and the oblong holes 214 of the other end of the second partition 212 and the third partition 213 are also connected by bolts. Since the second heat exchange tube 23 undergoes thermal expansion and contraction during heat exchange, resulting in axial expansion and contraction, the partition 21 needs to have a corresponding displacement. The partition 21 adopts a three-section structure with waist-shaped holes, which can be displaced accordingly with the thermal expansion and contraction of the second heat exchange tube 23, making the second heat exchange tube 23 less prone to breakage during heat exchange.

[0052] like Figure 5 As shown, a third tube sheet 26 is provided between the partition plate 21 and the header pipe 22. The end of the second heat exchange tube 23 passes through the third tube sheet 26 and communicates with the header pipe 22. Because the welding requirements between the second heat exchange tube 23 and the header pipe 22 are high, the conventional welding method of small tubes and large tubes cannot be used. Therefore, a rectangular plate structure third tube sheet 26 is provided between the partition plate 21 and the header pipe 22 to facilitate the welding connection between the second heat exchange tube 23 and the header pipe 22.

[0053] like Figure 3 and Figure 5 As shown, several dummy tubes are provided on the side of the partition 21 away from the second heat exchange tube 23. Because the distance between the header assembly 20 and the first heat exchange tube 16 is large, short-circuiting may occur here, affecting the flow of the third medium. Therefore, dummy tubes are provided to act as heat exchange tubes to avoid short-circuiting caused by excessive distance.

[0054] The dummy tubes include a first dummy tube 27 and a second dummy tube 28 that are nested together. The end of the first dummy tube 27 away from the second dummy tube 28 is fixedly connected to the third tube sheet 26, and the end of the second dummy tube 28 away from the first dummy tube 27 is fixedly connected to the second partition plate 212. Since there is no hot fluid flowing inside the dummy tubes, the axial expansion and contraction of the dummy tubes and the second heat exchange tube 23 will be asynchronous. During expansion and contraction, the weld points will be stressed, potentially leading to tearing during use. Therefore, the dummy tubes are designed with one end welded and the other end nested, allowing the first dummy tube 27 and the second dummy tube 28 to move relative to each other axially. This allows the first dummy tube 27 to move with the third tube sheet 26, and the second dummy tube 28 to move with the second partition plate 212, ensuring that the dummy tubes expand and contract accordingly with the displacement of the partition plate 212. Simultaneously, the dummy tubes also provide support. Alternatively, the end of the first dummy tube 27 away from the second dummy tube 28 can be welded to the first partition plate 211 or the third partition plate 213 to achieve the same technical effect.

[0055] like Figure 3 and Figure 6 As shown, the bottom of the manifold assembly 20 is provided with several support portions 24, each support portion 24 having four support legs 241 arranged in a rectangular pattern. The support portions 24 can suspend the manifold assembly 20, which facilitates the flow of the third medium. Simultaneously, the rectangular arrangement of the four support legs 241 reduces the space occupied and minimizes interference with the flow of the third medium.

[0056] like Figure 4 and Figure 5 As shown, a plurality of support rods 25 are provided between the two partition plates 21, and the two ends of the support rods 25 are fixedly connected to the partition plates 21 respectively. The support rods 25 are spot-welded to the partition plates 21 as a whole, which can not only support the second heat exchange tube 23, but also reduce its fluid interference to the third medium. Moreover, since the support rods 25 are connected to the partition plates 21 as a whole, they can move accordingly with the displacement of the partition plates 21 without affecting the expansion and contraction of the second heat exchange tube 23.

[0057] like Figure 7As shown in the cross-sectional view, the first medium flows within the first heat exchange tubes 16 on both sides of the partition 21, the second medium flows within the second heat exchange tubes 23 between the partitions 21, and the third medium flows within the space outside the second cavity 14 and the plurality of first heat exchange tubes 16 and the plurality of second heat exchange tubes 23. Because the temperature of the second medium is higher than that of the first medium, and the temperature of the first medium is higher than that of the third medium, the third medium spontaneously forms a circulating turbulent flow due to the temperature difference, flowing from the upper opening 201 to the second cavities 14 on both sides of the header assembly 20, and then flowing back into the header assembly 20 from the lower opening 202. During the flow, the third medium comes into contact with the first heat exchange tubes 16 and the second heat exchange tubes 23, thereby exchanging heat with the second and first media to achieve cooling of both media.

[0058] like Figure 1 As shown, at least two support plates 29 are provided inside the second cavity 14. For clarity, the support plates 29 are represented only by lines in the figure, but they actually have thickness. Figure 8 As shown, the support plate 29 is composed of several round steel bars welded together. Figure 9 As shown, the support plate 29 not only supports the first heat exchange tube 16, but the hollow structure formed by welding round steel also minimizes the area occupied by the support plate 29, reducing its interference with the flow of the third medium. It should be noted that the hollow structure formed by welding round steel is for supporting while facilitating the flow of the third medium; of course, it can also be welded into other suitable shapes.

[0059] like Figure 1 and Figure 7 As shown, the support plate 29 is supported and fixed by a plurality of tie rods 30, the two ends of which are fixedly connected to the first tube plate 11 and the second tube plate 12, respectively. The tie rods 30 can conveniently fix the support plate 29.

[0060] like Figure 1 As shown, the housing 10 is placed at an angle. The first inlet 104 for injecting the first medium, the second inlet 106 for injecting the second medium, and the third inlet 108 for injecting the third medium are all located at the higher end of the housing 10. Under the action of gravity, it is easier for different media to flow, so that different media can be discharged from their respective first outlet 105, second outlet 107, and third outlet 109.

[0061] Because a header assembly 20 is added inside the heat exchanger, the heat exchanger in this embodiment adopts a unique manufacturing method, the specific steps of which are as follows:

[0062] Step A: Place the middle tube shell 103 separately;

[0063] Step B: Secure the assembled manifold assembly 20 to the designated position inside the central housing 103;

[0064] Step C: Weld the first tube sheet 11 to the designated position;

[0065] Step D: Weld one end of several tie rods 30 onto the first tube sheet 11;

[0066] Step E: Weld the support plate 29 from the other end of the first tube plate 11 to the middle tube shell 103, pass it through the tie rod 30 and fix it in the corresponding position. During this process, the insertion of the tie rod 30 can be observed through the observation hole 110 provided on the shell 10.

[0067] Step F: Pass a plurality of first heat exchange tubes 16 sequentially through the first tube sheet 11 and the support plate 29;

[0068] Step G: Weld the second tube sheet 12 to the other end of the first tube sheet 11 from the middle tube shell 103 and place it in the designated position, and let the other end of the first heat exchange tube 16 pass through the second tube sheet 12, and then weld the second tube sheet 12 onto the shell 10.

[0069] Step H: Weld both ends of the first heat exchange tube 16 to the first tube sheet 11 and the second tube sheet 12 respectively. A schematic diagram of the welding structure of the first heat exchange tube 16 and the first tube sheet 11 is shown below. Figure 10 As shown, the welding of the first heat exchange tube 16 to the second tube sheet 12 is also related to... Figure 10 similar;

[0070] Step I: Install the first tube head 101 and the second tube head 102 at both ends of the middle tube shell 103.

[0071] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that, At least including: The shell (10) has a first tube sheet (11) and a second tube sheet (12) spaced apart along the length of the shell (10). The shell (10) is divided into a first cavity (13), a second cavity (14) and a third cavity (15) by the first tube sheet (11) and the second tube sheet (12). The second cavity (14) is located between the first cavity (13) and the third cavity (15). The second cavity (14) is provided with a plurality of hollow first heat exchange tubes (16). One end of the plurality of first heat exchange tubes (16) is fixedly connected to the first tube sheet (11) and communicates with the first cavity (13), and the other end is fixedly connected to the second tube sheet (12) and communicates with the third cavity (15). The first cavity (13), the plurality of first heat exchange tubes (16) and the third cavity (15) are supplied with the flow of the first medium. The manifold assembly (20) is disposed in the second cavity (14) and includes two partitions (21) arranged parallel to each other along the length of the shell (10). The two partitions (21) form an upper opening (201) and a lower opening (202). The two ends of the partitions (21) are respectively provided with manifold pipes (22). A plurality of hollow second heat exchange tubes (23) are disposed between the two partitions (21). The two ends of the plurality of second heat exchange tubes (23) are respectively connected to the manifold pipes (22). The manifold pipes (22) and the plurality of second heat exchange tubes (23) are supplied with the flow of the second medium. A plurality of first heat exchange tubes (16) are distributed on both sides of the manifold assembly (20). The space inside the second cavity (14) and outside the plurality of first heat exchange tubes (16) and the plurality of second heat exchange tubes (23) is used for the flow of the third medium. The temperature of the second medium is higher than the temperature of the first medium, and the temperature of the first medium is higher than the temperature of the third medium. The partition (21) includes a first partition (211), a second partition (212) and a third partition (213) arranged along the length of the shell (10); a third tube sheet (26) is provided between the partition (21) and the manifold pipe (22). The partition (21) has several dummy tubes on the side away from the second heat exchange tube (23); the dummy tubes include a first dummy tube (27) and a second dummy tube (28) that are nested together. The end of the first dummy tube (27) away from the second dummy tube (28) is fixedly connected to the third tube sheet (26), and the end of the second dummy tube (28) away from the first dummy tube (27) is fixedly connected to the second partition (212). The first dummy tube (27) and the second dummy tube (28) can be relatively displaced along the axial direction.

2. The heat exchanger according to claim 1, characterized in that: One end of the first partition (211), both ends of the second partition (212) and one end of the third partition (213) are respectively provided with a waist-shaped hole (214). The waist-shaped hole (214) of the first partition (211) and the waist-shaped hole (214) at one end of the second partition (212) are connected by bolts. The waist-shaped hole (214) at the other end of the second partition (212) and the waist-shaped hole (214) of the third partition (213) are connected by bolts.

3. The heat exchanger according to claim 1, characterized in that: The end of the second heat exchange tube (23) passes through the third tube sheet (26) and is connected to the header pipe (22).

4. The heat exchanger according to claim 1, characterized in that: The bottom of the manifold assembly (20) is provided with several support parts (24), and the support parts (24) are provided with four support feet (241), which are arranged in a rectangular pattern.

5. The heat exchanger according to claim 1, characterized in that: A plurality of support rods (25) are provided between the two partitions (21), and the two ends of the plurality of support rods (25) are respectively fixedly connected to the partitions (21).

6. The heat exchanger according to claim 1, characterized in that: The second cavity (14) is provided with at least two support plates (29). The support plates (29) are composed of several round steel welded together. The support plates (29) are supported and fixed by several tie rods (30). The two ends of the tie rods (30) are fixedly connected to the first tube plate (11) and the second tube plate (12) respectively.

7. The heat exchanger according to any one of claims 1-6, characterized in that: The housing (10) includes a first pipe head (101) and a second pipe head (102) located at both ends and a middle housing (103) located in the middle. The first pipe head (101) is provided with a first inlet (104) communicating with the first cavity (13). The second pipe head (102) is provided with a first outlet (105) communicating with the third cavity (15). The middle housing (103) is provided with a second inlet (106) communicating with one of the manifold pipes (22), a second outlet (107) communicating with another manifold pipe (22), a third inlet (108) communicating with the second cavity (14), and a third outlet (109). The housing (10) is placed at an angle and is provided with an observation hole (110) for observation.

8. The method for manufacturing a heat exchanger according to claim 7, characterized in that, include, Step A: Place the middle tube shell (103) separately; Step B: Place the assembled manifold assembly (20) into the designated position inside the central housing (103); Step C: Weld the first tube sheet (11) to the designated position; Step D: Weld one end of several tie rods (30) to the first tube sheet (11); Step E: Weld the support plate (29) from the middle tube shell (103) to the other end of the first tube sheet (11), pass it through the tie rod (30), and fix it to the corresponding position; Step F: Pass a number of first heat exchange tubes (16) through the first tube sheet (11) and the support plate (29) in sequence. Step G: Weld the second tube sheet (12) from the middle tube shell (103) to the other end of the first tube sheet (11) and place it in the designated position, and let the other end of the first heat exchange tube (16) pass through the second tube sheet (12), and then weld the second tube sheet (12). Step H: Weld the two ends of the first heat exchange tube (16) to the first tube sheet (11) and the second tube sheet (12) respectively; Step I: Install the first tube head (101) and the second tube head (102) at both ends of the middle tube shell (103).

Images