Brazed heat exchanger with stacked pipe bodies

Abstract

The utility model discloses a brazing type heat exchanger with stacked pipe bodies. The brazing type heat exchanger comprises a heat exchange core body, a first end cover and a second end cover. The heat exchange core body at least comprises a first pipe body, a second pipe body and an end socket. The first pipe bodies and the second pipe bodies are tightly stacked in pairs and fixedly connected through brazing, and the end sockets are fixed between the protruding parts of every two adjacent first pipe bodies through brazing. The heat exchange core body is simple in structure, low in mold opening cost and short in development period, heat exchange core bodies with different sizes and different heat exchange coefficients can be formed through combination of various flat pipes with different lengths, and the heat exchange core body is suitable for various different requirements. Meanwhile, the first pipe body and the second pipe body which are different in length are adopted to be matched, and the end socket is adopted to plug and guide the second medium flow channel, so that the first medium flow channel and the second medium flow channel are completely isolated, and the streaming phenomenon is completely eradicated. In addition, the flow dividing and collecting structure is simple, machining and manufacturing are easy, and the mold opening cost is low.

Description

Technical Field

[0001] The utility model relates to the field of heat exchangers, in particular to a brazing heat exchanger with stacked tubes. Background Art

[0002] Plate heat exchangers have long been widely used for their high heat transfer efficiency, minimal heat loss, compact and lightweight structure, and small footprint. Existing detachable plate heat exchangers, due to the complete use of rubber gaskets between the plates, are limited to operating pressures below 2.5 MPa and operating temperatures below 180°C. These are also severely restricted in applications where the media corrodes the rubber gaskets or in high-temperature, high-pressure environments. Brazed heat exchangers address these shortcomings and are suitable for these applications.

[0003] Existing brazed heat exchangers are constructed by stacking multiple layers of stamped heat exchange plates together and then brazing them together. Due to the complex flow paths within the plates, these plates suffer from high mold development costs, long development cycles, and poor versatility. Using a flat tube structure as the heat exchanger core can address these issues. However, since a heat exchanger contains multiple flow paths for different media, the flow manifold is a crucial component. Existing flat tube heat exchangers often have cross-flow problems with their flow manifolds. Furthermore, the complex flow manifold structure leads to inconvenient processing and high mold costs. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of the present invention is to provide a brazed heat exchanger with stacked tubes, which can solve the problems of existing heat exchangers such as easy cross-flow, high mold development costs, long development cycle, and poor versatility.

[0005] The utility model is realized by the following technical solutions:

[0006] 18. The heat exchanger as claimed in claim 17, wherein the bridge has two opposite ends, and the ends are connected along the length of the heat exchanger to form a circle around the bridge. The bridge has two opposite ends, and the ends are connected along the length of the heat exchanger to form a circle around the bridge. The bridge has two opposite ends, and the ends are connected along the length of the heat exchanger to form a circle around the bridge.

[0007] Furthermore, the first tube body and the second tube body are flat tubes or harmonica tubes.

[0008] Furthermore, the first end cover is a rectangular hollow shell with a side opening; the side opening of the first end cover is fixed to the end of the heat exchange core so that the interior of the first end cover is connected to all the first sub-channels.

[0009] Furthermore, the second end cover is a rectangular hollow shell with an open bottom; the bottom opening of the second end cover is fixed to the top of the heat exchange core so that the interior of the second end cover is connected to the flow channel gap and all the second sub-channels.

[0010] Furthermore, the brazed heat exchanger with stacked tubes further comprises: a guard plate; two guard plates are brazed and fixed to both sides of the heat exchange core.

[0011] Furthermore, the head has a narrow end and a wide end opposite to each other; the narrow end is located on the side of the heat exchange core relative to the second end cover, the narrow end is spaced apart from the end of the second tube body, and forms the flow channel gap with the second sub-channel; the wide end is located on the opposite side of the second end cover, and the wide end abuts against the end of the second tube body.

[0012] Furthermore, the surfaces of the first tube body and the second tube body have a welding composite layer, or a welding sheet is filled between two adjacent tube bodies.

[0013] Furthermore, the head is made of an aluminum alloy plate, and its surface has a welded composite layer.

[0014] Furthermore, the number of the first end covers is two, and they are respectively arranged at the left and right ends of the heat exchange core; the two first pipeline interfaces are respectively used for the inflow or outflow of the first medium, and are arranged opposite to each other in a diagonal direction.

[0015] Furthermore, the number of the second end covers is two, and they are respectively arranged on the front and rear sides of the top of the heat exchange core; the two second pipeline interfaces are respectively used for the inflow or outflow of the second medium, and are arranged opposite to each other in a diagonal direction.

[0016] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0017] During heat exchange, a first medium is introduced into the first pipe interface of the first end cap on one side. The first medium is divided through multiple first sub-channels within the first tube body, and the multiple tributaries are combined in the first end cap on the other side, and then flow out of the first pipe interface on that side. Simultaneously, a second medium is introduced into the second pipe interface of the second end cap on one side. The second medium is divided through multiple second sub-channels within the second tube body, and the multiple tributaries are combined in the flow channel gap between the head and the second end cap. The second medium then enters the second end cap on the other side through the flow channel gap and flows out of the second pipe interface on that side. During the flow process, the first medium and the second medium exchange heat through the wall of the tube body.

[0018] In the present invention: (1) The entire heat exchanger adopts brazing sealing, without the need for gaskets. The flow channel in the flat tube heat exchange plate can withstand high temperature and pressure, and is resistant to corrosive media. The flat tube structure heat exchange plate has a simple structure, low mold opening cost, and short development cycle. The size of the flat tube structure heat exchange plate can be flexibly modified. By combining a variety of flat tubes of different lengths, heat exchange cores of different volumes and different heat transfer coefficients can be formed to meet various different needs. (2) Multiple tubes are connected by stacking and tight brazing. No connection structure or connector is required between the tubes, but they are tightly fitted in pairs to ensure high heat transfer efficiency. (3) In this heat exchanger, the first end cover is installed at the end of the heat exchange core, and the second end cover is set on the side of the heat exchange core, rather than the two end covers sharing the same side for input and output of the medium; in addition, the first tube body and the second tube body of different lengths are used to cooperate, and the head is used to block and guide the second medium flow channel, so that the first medium flow channel and the second medium flow channel are completely isolated, eliminating the occurrence of cross-flow phenomenon. (4) The flow distribution structure is simple, and the first end cover, second end cover, head and other structures are easy to process and manufacture, and the mold opening cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a three-dimensional schematic diagram of the entire heat exchanger;

[0020] Figure 2 Shown is a front view of the entire heat exchanger;

[0021] Figure 3 Shown is a top view of the entire heat exchanger;

[0022] Figure 4 Shown Figure 2 Sectional view along the AA direction;

[0023] Figure 5 Shown Figure 3 Cross-section view in the middle BB direction;

[0024] Figure 6 Shown is a three-dimensional view of the heat exchange core;

[0025] Figure 7 Shown is a three-dimensional view of the heat exchange core from another angle;

[0026] Figure 8 Shown is a schematic diagram of the internal structure of the heat exchange core.

[0027] In the figure: 10, first tube body; 11, first sub-channel; 20, second tube body; 21, second sub-channel; 30, head; 31, narrow end; 32, wide end; 40, flow channel gap; 50, first end cover; 51, first pipeline interface; 60, second end cover; 61, second pipeline interface; 70, guard plate. DETAILED DESCRIPTION

[0028] Below, the present invention is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] See Figure 1-Figure 3 The present invention discloses a brazed heat exchanger with stacked tubes, which includes a heat exchange core, a first end cover 50, and a second end cover 60. The heat exchange core includes at least two types of tubes; in this embodiment, refer to Figure 4-Figure 7 The heat exchange core includes a first tube body 10, a second tube body 20 and a head 30. The first tube body 10 and the second tube body 20 are of different lengths. They are tightly stacked and fixedly connected by brazing. The first tube body 10 is provided with a plurality of first sub-channels 11 for the passage of the first medium, and the second tube body 20 is provided with a plurality of second sub-channels 21 for the passage of the second medium. Figure 8 The length of the second tube body 20 is shorter than that of the first tube body 10. Horizontally, the ends of the first tube body 10 protrude beyond the ends of the second tube body 20, forming protrusions. The end caps 30 are brazed and fixed between the protrusions of two adjacent first tube bodies 10. A gap 40 is formed between the end caps 30 and the ends of the second tube bodies 20 (i.e., the openings of the second sub-channels 21). This gap 40 communicates with the second sub-channels 21. The heat exchange tubes of the first and second tube bodies 10, 20, can be flat tubes or harmonica tubes. In this embodiment, flat tubes are preferred.

[0033] See Figure 4 The first end cover 50 is fixed on the left and right ends of the heat exchange core. The interior of the first end cover 50 is simultaneously connected to all the first sub-channels 11, so that the multiple branches in the first tube body 10 form a collection flow in the first end cover 50; the first end cover 50 is provided with a first pipeline interface 51 for connecting an external pipeline to input or output the first medium.

[0034] The second end cap 60 is fixed to a side portion of the heat exchange core, which can be the upper, lower, front, or rear surface. The interior of the second end cap 60 is connected to the flow channel gap 40, and therefore to all second sub-channels 21. This allows the multiple branches within the second tube body 20 to converge at the flow channel gap 40 and the second end cap 60. The second end cap 60 is provided with a second pipeline interface 61 for connecting an external pipeline to input or output the second medium.

[0035] Of course, in other embodiments, three, four or any number of tubes of different lengths may be used as the stacked structure of the heat exchange core, depending on the amount of media to be heat exchanged.

[0036] The working process of this utility model is:

[0037] During heat exchange, a first medium is introduced into the first pipe connection 51 of the first end cap 50 on one side. The first medium is then divided through the multiple first sub-channels 11 in the first tube body 10. The multiple tributaries converge in the first end cap 50 on the other side and flow out of the first pipe connection 51 on that side, resulting in a horizontal flow in the first medium channel. Simultaneously, a second medium is introduced into the second pipe connection 61 of the second end cap 60 on one side. The second medium is then divided through the multiple second sub-channels 21 in the second tube body 20. The multiple tributaries converge in the flow gap 40 between the end cap 30 and the second end cap 60. The tributaries then enter the second end cap 60 on the other side through the flow gap 40 and flow out of the second pipe connection 61 on that side. The second medium channel is initially horizontal, but then transitions from horizontal to vertical after being guided by the end cap 30.

[0038] In the process of the medium continuously passing through the heat exchanger, the first medium and the second medium realize heat exchange through the wall surface of the tube body.

[0039] The utility model has the following technical effects:

[0040] (1) The entire heat exchanger adopts brazing sealing, without the need for gaskets. The flow channel inside the flat tube heat exchange plate can withstand high temperature and pressure, and is resistant to corrosive media. The flat tube structure heat exchange plate has a simple structure, low mold opening cost, and short development cycle. The size of the flat tube structure heat exchange plate can be flexibly modified. By combining a variety of flat tubes of different lengths, heat exchange cores of different sizes and different heat transfer coefficients can be formed to meet various different needs. (2) Multiple tube bodies are connected by stacking and tightly brazing. No connection structure or connectors are required between the tube bodies. Instead, they are tightly fitted to ensure high heat exchange efficiency. (3) In this heat exchanger, the first end cap 50 is installed at the end of the heat exchange core, and the second end cap 60 is installed at the side of the heat exchange core, rather than the two end caps sharing the same side for inputting and outputting the medium. In addition, the first tube body 10 and the second tube body 20 of different lengths are used for coordination, and the head 30 is used to block and guide the second medium flow channel, thereby completely isolating the first medium flow channel from the second medium flow channel, eliminating the occurrence of cross-flow. (4) The flow distribution and collection structure is simple, and the first end cap 50, the second end cap 60, the head 30 and other structures are easy to process and manufacture, and the mold opening cost is low.

[0041] In this embodiment, see Figure 1-Figure 3The first end cap 50 is a hollow rectangular shell with an open side. The open side of the first end cap 50 is fixed to the end of the heat exchange core, thereby connecting the interior of the first end cap 50 to all first sub-channels 11. Furthermore, the second end cap 60 is a hollow rectangular shell with an open bottom. The open bottom of the second end cap 60 is fixed to the top of the heat exchange core, thereby connecting the interior of the second end cap 60 to the flow channel gap 40 and all second sub-channels 21.

[0042] Both the first end cap 50 and the second end cap 60 utilize a rectangular shell structure, offering advantages such as simplicity and ease of fabrication. Furthermore, the first and second end caps 50 and 60 are mounted on different side surfaces of the heat exchange core. This mounting position facilitates welding and securing the rectangular shells, while also aligning the flow directions of the first and second medium flow channels to effectively prevent cross-flow.

[0043] Preferably, see Figure 6-Figure 7 The present invention further includes a guard plate 70 , and two guard plates 70 are brazed and fixed on both sides of the heat exchange core. Specifically, the side surfaces of the guard plates 70 are fitted and fixed to the side surfaces of the tube body.

[0044] Preferably, see Figure 8 The end cap 30 is in the shape of an elongated strip, having a narrow end 31 and a wide end 32. The narrow end 31 is located on the side of the heat exchange core opposite the second end cap 60. Thus, the narrow end 31 is spaced apart from the end of the second tube 20, forming the aforementioned flow channel gap 40 between the narrow end 31 and the second sub-channel 21. The wide end 32 is located on the opposite side of the second end cap 60, abutting against the end of the second tube 20, thereby directing the second medium toward the narrow end 31.

[0045] Preferably, the surfaces of the first tube body 10 and the second tube body 20 have a welding composite layer, or welding sheets are filled between two adjacent tube bodies to facilitate brazing and fixing of the heat exchange core.

[0046] Preferably, the head 30 is an aluminum alloy plate with a welded composite layer on its surface.

[0047] Preferably, there are two first end covers 50, which are respectively arranged on the left and right ends of the heat exchange core. The two first pipelines are used for the inflow or outflow of the first medium, and are arranged opposite to each other in the diagonal direction; thereby, the first medium can flow over a greater distance, which is conducive to sufficient heat exchange.

[0048] Preferably, there are two second end covers 60, which are respectively arranged on the front and rear sides of the heat exchange core. The two second pipe interfaces 61 are used for the inflow or outflow of the second medium, and are arranged opposite to each other in the diagonal direction, so that the second medium can flow a longer distance, which is conducive to sufficient heat exchange.

[0049] The processing of this heat exchanger is as follows:

[0050] First, the first tube body 10 and the second tube body 20 are stacked alternately, and the head 30 is plugged into the gap of the first tube body 10, and then the guard plate 70 is assembled on both sides. Then, the first tube body 10, the second tube body 20, the head 30 and the guard plate 70 are brazed into one piece. Figure 6-Figure 7 After the core is brazed, the end cover and side cover are welded to the heat exchange core to obtain the overall structure of the heat exchanger. Figure 1 .

[0051] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A brazed heat exchanger with stacked tubes, characterized in that: include: The heat exchange core comprises at least: a first tube body, a second tube body and a head; The first tube body and the second tube body are stacked in pairs and brazed to each other. The first tube body is provided with a plurality of first sub-channels for passage of a first medium, and the second tube body is provided with a plurality of second sub-channels for passage of a second medium. The end of the first tube body protrudes horizontally upward from the end of the second tube body. The sealing head is brazed and fixed between the protruding portions of two adjacent first tube bodies, and a flow channel gap is formed between the end of the second tube body, and the flow channel gap is connected to the second sub-channel. A first end cover is provided on the end of the heat exchange core so that the interior of the first end cover is simultaneously connected to all the first sub-channels; a first pipeline interface is provided on the first end cover; The second end cover is arranged on the side of the heat exchange core and encloses the outside of all the flow channel gaps so that the interior of the second end cover is simultaneously connected to the flow channel gaps; a second pipeline interface is opened on the second end cover.

2. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The first tube body and the second tube body are flat tubes or harmonica tubes.

3. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The first end cover is a rectangular hollow shell with a side opening; the side opening of the first end cover is fixed to the end of the heat exchange core so that the interior of the first end cover is connected to all the first sub-channels.

4. The brazed heat exchanger with stacked tubes according to claim 3, wherein: The second end cover is a rectangular hollow shell with an open bottom; the open bottom of the second end cover is fixed to the top of the heat exchange core so that the interior of the second end cover is connected to the flow channel gap and all the second sub-channels.

5. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The brazed heat exchanger with stacked tubes further comprises: a guard plate; two guard plates are brazed and fixed on both sides of the heat exchange core.

6. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The head has a narrow end and a wide end opposite to each other; the narrow end is located on the side of the heat exchange core relative to the second end cover, the narrow end is spaced apart from the end of the second tube body, and forms the flow channel gap with the second sub-channel; the wide end is located on the opposite side of the second end cover, and the wide end abuts against the end of the second tube body.

7. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The surfaces of the first tube body and the second tube body have a welding composite layer, or a welding sheet is filled between two adjacent tube bodies.

8. The brazed heat exchanger with stacked tubes according to claim 1, wherein: The head is made of an aluminum alloy plate, and a welded composite layer is provided on the surface of the plate.

9. The brazed heat exchanger with stacked tubes according to claim 1, wherein: There are two first end covers, which are respectively arranged at the left and right ends of the heat exchange core; the two first pipeline interfaces are respectively used for the inflow or outflow of the first medium, and are arranged opposite to each other in a diagonal direction.

10. The brazed heat exchanger with stacked tubes according to claim 1, wherein: There are two second end covers, which are respectively arranged at the front and rear sides of the top of the heat exchange core; the two second pipeline interfaces are respectively used for the inflow or outflow of the second medium and are arranged opposite to each other in a diagonal direction.

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