CN112683083A - Microchannel heat exchanger and production method - Google Patents
Microchannel heat exchanger and production method Download PDFInfo
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- CN112683083A CN112683083A CN201910990140.0A CN201910990140A CN112683083A CN 112683083 A CN112683083 A CN 112683083A CN 201910990140 A CN201910990140 A CN 201910990140A CN 112683083 A CN112683083 A CN 112683083A
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Abstract
The invention provides a micro-channel heat exchanger and a production method thereof. According to the technical scheme, the microchannel heat exchanger is designed in a split mode, namely the microchannel heat exchanger comprises at least two heat exchangers, the two heat exchangers are respectively welded in the brazing furnace, the problem that the microchannel heat exchanger cannot enter the brazing furnace for welding due to the fact that the overall size of the microchannel heat exchanger is too large is solved, then the two heat exchangers are connected in a combined mode through the two connecting rings, and therefore the large-size microchannel heat exchanger is formed. By adopting the technical scheme, the large-size micro-channel heat exchanger can be produced under the condition of not increasing additional equipment investment, the problem that the large-size micro-channel heat exchanger is difficult to produce is solved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of micro-channel heat exchangers, in particular to a micro-channel heat exchanger and a production method thereof.
Background
At present, the height of a micro-channel heat exchanger is limited by the width of a brazing furnace mesh belt and the length of a collecting pipe stamping die, however, along with the development of more and more commercial heat exchangers, the size height of the heat exchanger required by more and more customers exceeds the conventional size, a process fin, square steel and the like are respectively added on two sides of a core body in front of a brazing furnace, so that the size of the core body in front of the brazing furnace is close to or exceeds the width of the mesh belt, at present, the large-size micro-channel heat exchanger cannot be brazed in the furnace, and the equipment cost can be greatly increased by customizing the brazing furnace unless the brazing furnace. How can a microchannel heat exchanger of large size be produced without additional equipment investment? This is one of the problems to be solved by the present application.
Disclosure of Invention
The invention provides a micro-channel heat exchanger and a production method thereof, which aim to solve the problem that a large-size micro-channel heat exchanger is difficult to produce in the prior art.
In order to solve the above-mentioned problems, according to one aspect of the present invention, there is provided a microchannel heat exchanger including: the heat exchanger comprises a first collecting pipe, a second collecting pipe and a plurality of first flat pipes arranged between the first collecting pipe and the second collecting pipe, wherein two ends of each first flat pipe are respectively communicated with the first collecting pipe and the second collecting pipe in a one-to-one correspondence manner; the second heat exchanger comprises a third collecting pipe, a fourth collecting pipe and a plurality of second flat pipes arranged between the third collecting pipe and the fourth collecting pipe, and two ends of each second flat pipe are respectively communicated with the third collecting pipe and the fourth collecting pipe in a one-to-one correspondence mode; the first collecting pipe and the third collecting pipe are connected through one connecting ring, and the second collecting pipe and the fourth collecting pipe are connected through the other connecting ring.
Furthermore, the first collecting pipe and the third collecting pipe are coaxially arranged, the second collecting pipe and the fourth collecting pipe are coaxially arranged, the structures of the first collecting pipe, the second collecting pipe, the third collecting pipe and the fourth collecting pipe are all the same, the structures of the first flat pipe and the second flat pipe are the same, and the first flat pipe and the second flat pipe are arranged side by side.
Further, for a connecting ring connecting the first header and the third header: one end of the connecting ring is sleeved with the end of the first collecting pipe, and the other end of the connecting ring is sleeved with the end of the third collecting pipe.
Further, a first conical surface is arranged on the inner wall of one end of the connecting ring, a second conical surface is arranged on the inner wall of the other end of the connecting ring, a sleeve of the connecting ring is arranged at the end of the first collecting pipe, the first conical surface is connected with the first collecting pipe in a matched mode, the other end of the connecting ring is arranged at the end of the third collecting pipe in a sleeved mode, and the second conical surface is connected with the second collecting pipe in a matched mode.
Further, the go-between includes the ring body and sets up first spacing ring on the inner wall of ring body, a pot head of ring body is established the tip of first pressure manifold, a terminal surface of first spacing ring with the terminal surface butt of first pressure manifold, another pot head of ring body is established the tip of third pressure manifold, another terminal surface of first spacing ring with the terminal surface butt of third pressure manifold.
Further, the connection ring is fixedly connected to the first collecting pipe and the third collecting pipe by welding, and the connection ring further includes: the interval sets up a plurality of first protruding muscle on the inner wall of ring body, it is a plurality of first protruding muscle distributes the both sides of first spacing ring, two adjacent first protruding area between the muscle is used for filling the solder.
Further, the go-between includes the ring body and sets up second spacing ring on the outer wall of ring body, the one end of ring body is worn to establish the tip of first pressure manifold, a terminal surface of second spacing ring with the terminal surface butt of first pressure manifold, the other end of ring body is worn to establish the tip of third pressure manifold, another terminal surface of second spacing ring with the terminal surface butt of third pressure manifold.
Further, the connection ring is fixedly connected to the first collecting pipe and the third collecting pipe by welding, and the connection ring further includes: the interval sets up a plurality of second protruding muscle on the outer wall of ring body, it is a plurality of the second protruding muscle distributes the both sides of second spacing ring, two adjacent the region between the second protruding muscle is used for filling the solder.
Further, the first collecting pipe and the third collecting pipe are communicated at one connecting ring, and the second collecting pipe and the fourth collecting pipe are not communicated at the other connecting ring; or, the first collecting pipe and the third collecting pipe are not communicated at one connecting ring, and the second collecting pipe and the fourth collecting pipe are communicated at the other connecting ring.
Furthermore, a spacer is arranged in the first collecting pipe, and the spacer separates the cavity of the first collecting pipe so as to divide the cavity of the first collecting pipe into a plurality of sub-cavities along the axial direction; and/or a spacer is arranged in the second collecting pipe, and the spacer separates the cavity of the second collecting pipe so as to divide the cavity of the second collecting pipe into a plurality of sub-cavities along the axial direction.
Furthermore, a spacer is arranged in the third collecting pipe, and the spacer separates the cavity of the third collecting pipe so as to divide the cavity of the third collecting pipe into a plurality of sub-cavities along the axial direction; and/or a spacer is arranged in the fourth collecting pipe, and the spacer separates the cavity of the fourth collecting pipe so as to divide the cavity of the fourth collecting pipe into a plurality of sub-cavities along the axial direction.
According to another aspect of the present invention, there is provided a production method for producing a microchannel heat exchanger, the production method comprising: the microchannel heat exchanger is designed to comprise at least two heat exchangers; respectively welding the at least two heat exchangers in a brazing furnace; and then connecting the at least two heat exchangers in sequence along the length direction of the heat exchangers to combine the microchannel heat exchangers.
Further, the microchannel heat exchanger includes a connection ring, connecting two of the heat exchangers includes: sleeving the mutually corresponding collecting pipes of the two heat exchangers with the connecting ring respectively; and respectively welding and fixing the mutually corresponding collecting pipes of the two heat exchangers with the connecting ring.
By applying the technical scheme of the invention, the microchannel heat exchanger is provided with a first heat exchanger, a second heat exchanger and at least two connecting rings, the first heat exchanger comprises a first collecting pipe, a second collecting pipe and a plurality of first flat pipes arranged between the first collecting pipe and the second collecting pipe, and two ends of each first flat pipe are respectively communicated with the first collecting pipe and the second collecting pipe in a one-to-one correspondence manner; the second heat exchanger comprises a third collecting pipe, a fourth collecting pipe and a plurality of second flat pipes arranged between the third collecting pipe and the fourth collecting pipe, and two ends of each second flat pipe are respectively communicated with the third collecting pipe and the fourth collecting pipe in a one-to-one correspondence mode; the first collecting pipe and the third collecting pipe are connected through one connecting ring, and the second collecting pipe and the fourth collecting pipe are connected through the other connecting ring. According to the technical scheme, the microchannel heat exchanger is designed in a split mode, namely the microchannel heat exchanger comprises at least two heat exchangers, the two heat exchangers are respectively welded in the brazing furnace, the problem that the microchannel heat exchanger cannot enter the brazing furnace for welding due to the fact that the overall size of the microchannel heat exchanger is too large is solved, then the two heat exchangers are connected in a combined mode through the two connecting rings, and therefore the large-size microchannel heat exchanger is formed. By adopting the technical scheme, the large-size micro-channel heat exchanger can be produced under the condition of not increasing additional equipment investment, the problem that the large-size micro-channel heat exchanger is difficult to produce is solved, and the production cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural diagram of a microchannel heat exchanger provided by an embodiment of the invention;
FIG. 2 shows a perspective view of the microchannel heat exchanger of FIG. 1;
FIG. 3 shows an enlarged view of the first and second heat exchangers of FIG. 1 at the junction;
figure 4 shows a first constructive schematic view of the coupling ring in figure 1;
FIG. 5 shows a second structural view of the attachment ring of FIG. 1;
figure 6 shows a third constructional view of the coupling ring in figure 1;
figure 7 shows a fourth constructional view of the coupling ring in figure 1;
FIG. 8 shows a fifth construction of the attachment ring of FIG. 1;
FIG. 9 is a schematic diagram showing another configuration of a microchannel heat exchanger provided in an embodiment of the invention;
fig. 10 shows a schematic structural diagram of a microchannel heat exchanger provided by an embodiment of the invention.
Wherein the figures include the following reference numerals:
10. a first heat exchanger; 11. a first header; 12. a second header; 13. a first flat tube; 20. a second heat exchanger; 21. a third header pipe; 22. a fourth header pipe; 23. a second flat tube; 30. a connecting ring; 31. a ring body; 32. a first limit ring; 33. a first rib; 34. a second stop collar; 35. a second rib; 36. a first conical surface; 37. a second tapered surface; 40. a spacer; 50. and (4) end covers.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the drawings, embodiments of the present invention provide a microchannel heat exchanger comprising: the heat exchanger comprises a first heat exchanger 10, wherein the first heat exchanger 10 comprises a first collecting pipe 11, a second collecting pipe 12 and a plurality of first flat pipes 13 arranged between the first collecting pipe 11 and the second collecting pipe 12, and two ends of each first flat pipe 13 are respectively communicated with the first collecting pipe 11 and the second collecting pipe 12 in a one-to-one correspondence manner; the second heat exchanger 20 comprises a third collecting pipe 21, a fourth collecting pipe 22 and a plurality of second flat pipes 23 arranged between the third collecting pipe 21 and the fourth collecting pipe 22, wherein two ends of each second flat pipe 23 are respectively communicated with the third collecting pipe 21 and the fourth collecting pipe 22 in a one-to-one correspondence manner; at least two connecting rings 30, the first header 11 and the third header 21 are connected by one connecting ring 30, and the second header 12 and the fourth header 22 are connected by another connecting ring 30.
By applying the technical scheme of the invention, a first heat exchanger 10, a second heat exchanger 20 and at least two connecting rings 30 are arranged in the microchannel heat exchanger, the first heat exchanger 10 comprises a first collecting pipe 11, a second collecting pipe 12 and a plurality of first flat pipes 13 arranged between the first collecting pipe 11 and the second collecting pipe 12, and two ends of each first flat pipe 13 are respectively communicated with the first collecting pipe 11 and the second collecting pipe 12 in a one-to-one correspondence manner; the second heat exchanger 20 comprises a third collecting pipe 21, a fourth collecting pipe 22 and a plurality of second flat pipes 23 arranged between the third collecting pipe 21 and the fourth collecting pipe 22, and two ends of each second flat pipe 23 are respectively communicated with the third collecting pipe 21 and the fourth collecting pipe 22 in a one-to-one correspondence manner; the first header 11 and the third header 21 are connected by a connecting ring 30, and the second header 12 and the fourth header 22 are connected by another connecting ring 30. According to the technical scheme, the microchannel heat exchanger is designed in a split mode, namely at least two heat exchangers are included, the two heat exchangers are respectively welded in the brazing furnace, the problem that the microchannel heat exchanger cannot enter the brazing furnace for welding due to the fact that the overall size of the microchannel heat exchanger is too large is solved, then the two heat exchangers are connected in a combined mode through the two connecting rings 30, and therefore the large-size microchannel heat exchanger is formed. By adopting the technical scheme, the large-size micro-channel heat exchanger can be produced under the condition of not increasing additional equipment investment, the problem that the large-size micro-channel heat exchanger is difficult to produce is solved, and the production cost is reduced.
In this embodiment, first pressure manifold 11 and the coaxial setting of third pressure manifold 21, second pressure manifold 12 and the coaxial setting of fourth pressure manifold 22, first pressure manifold 11, second pressure manifold 12, third pressure manifold 21 and fourth pressure manifold 22's structure is all the same, and first flat pipe 13 is the same with the structure of the flat pipe 23 of second, and a plurality of first flat pipes 13 and a plurality of flat pipe 23 of second all set up side by side. That is, the first heat exchanger 10 and the second heat exchanger 20 have the same structure, which facilitates the manufacture of both heat exchangers. In this embodiment, be provided with the fin on every flat pipe in order to improve the heat transfer effect.
In the present embodiment, for the connection ring 30 connecting the first header 11 and the third header 21: one end of the connecting ring 30 is sleeved with the end of the first collecting pipe 11, and the other end of the connecting ring 30 is sleeved with the end of the third collecting pipe 21. By means of the sleeving connection, the first collecting pipe 11 of the connecting ring 30 can be overlapped in the axial direction, and the connecting ring 30 and the third collecting pipe 21 can be overlapped in the axial direction, so that the connection reliability can be improved. Accordingly, the connection of the second header 12 and the fourth header 22 via the connection ring 30 may be made in the same manner and configuration. In this embodiment, the connection ring 30 may have a ring structure with a fixed outer diameter and a fixed inner diameter.
As shown in fig. 5, a first conical surface 36 is formed on an inner wall of one end of the connecting ring 30, a second conical surface 37 is formed on an inner wall of the other end of the connecting ring 30, one end of the connecting ring 30 is sleeved on the end of the first collecting pipe 11, the first conical surface 36 is in fit connection with the first collecting pipe 11, the other end of the connecting ring 30 is sleeved on the end of the third collecting pipe 21, and the second conical surface 37 is in fit connection with the second collecting pipe 12. The depth of the first collecting pipe 11 penetrating into the connecting ring 30 can be limited by arranging the first conical surface 36, and the depth of the third collecting pipe 21 penetrating into the connecting ring 30 can be limited by arranging the second conical surface 37, so that the limiting and reliable connection can be realized.
In this embodiment, the connection ring 30 includes a ring body 31 and a first limiting ring 32 disposed on an inner wall of the ring body 31, one end of the ring body 31 is sleeved on an end of the first collecting pipe 11, one end surface of the first limiting ring 32 abuts against an end surface of the first collecting pipe 11, the other end of the ring body 31 is sleeved on an end of the third collecting pipe 21, and the other end surface of the first limiting ring 32 abuts against an end surface of the third collecting pipe 21. Therefore, the depth of the first collecting pipe 11 penetrating into the connecting ring 30 and the depth of the third collecting pipe 21 penetrating into the connecting ring 30 can be limited by the two end faces of the first limiting ring 32, so that the limiting and reliable connection can be realized.
As shown in fig. 6, the connecting ring 30 is fixedly connected to the first header 11 and the third header 21 by welding, and the connecting ring 30 further includes: the first ribs 33 are arranged on the inner wall of the ring body 31 at intervals, the first ribs 33 are distributed on two sides of the first limiting ring 32, and the area between two adjacent first ribs 33 is used for filling solder. Through the arrangement, welding can be facilitated, welding quality is improved, and leakage of the micro-channel heat exchanger at the joint is avoided.
Alternatively, in the radial direction of the connection ring 30, the height of the first ribs 33 protruding from the inner wall of the ring body 31 is lower than the height of the first stopper ring 32 protruding from the inner wall of the ring body 31. The side of the first rib 33 is used to mate with the first header 11 or the third header 21. The area among the inner wall of the ring body 31, the outer wall of the first collecting pipe 11 and the first convex rib 33 is used for filling solder; the area between the inner wall of the ring 31, the outer wall of the third header 21 and the first rib 33 is filled with solder. The first ribs 33 are arranged along the axial direction of the ring body 31 in the length direction, and the plurality of first ribs 33 are distributed along the axial direction and the circumferential direction of the ring body 31. Thus, the first ribs 33 are uniformly arranged around the welding torch to ensure the welding quality. That is, the first ribs 33 can ensure the welding gap between the collecting pipe and the connecting ring 30, so that the solder can uniformly flow in through the capillary action, and finally, the welding seam is full, and the welding quality is improved.
As shown in fig. 7, the connection ring 30 includes a ring body 31 and a second limiting ring 34 disposed on an outer wall of the ring body 31, one end of the ring body 31 is inserted into an end of the first collecting pipe 11, one end surface of the second limiting ring 34 abuts against an end surface of the first collecting pipe 11, the other end of the ring body 31 is inserted into an end of the third collecting pipe 21, and the other end surface of the second limiting ring 34 abuts against an end surface of the third collecting pipe 21. Therefore, the depth of the first collecting pipe 11 penetrating into the connecting ring 30 and the depth of the third collecting pipe 21 penetrating into the connecting ring 30 can be limited by the two end faces of the second limiting ring 34, so that the limiting and reliable connection can be realized. The mechanism adopting interpolation is not higher than the original collecting pipe outer diameter, so that the unit of the client is convenient to install and does not have a part higher than the collecting pipe outer diameter.
As shown in fig. 8, the connecting ring 30 is fixedly connected to the first header 11 and the third header 21 by welding, and the connecting ring 30 further includes: a plurality of second ribs 35 are arranged on the outer wall of the ring body 31 at intervals, the plurality of second ribs 35 are distributed on two sides of the second limiting ring 34, and the area between two adjacent second ribs 35 is used for filling solder. Through the arrangement, welding can be facilitated, welding quality is improved, and leakage of the micro-channel heat exchanger at the joint is avoided.
Alternatively, in the radial direction of the connection ring 30, the height of the second ribs 35 protruding from the outer wall of the ring body 31 is lower than the height of the second limit ring 34 protruding from the outer wall of the ring body 31. The side surface of the second rib 35 is used for matching with the first collecting pipe 11 or the third collecting pipe 21; the area between the outer wall of the ring body 31, the inner wall of the first collecting pipe 11 and the second convex rib 35 is used for filling solder; the area between the outer wall of the ring 31, the inner wall of the third header 21 and the second rib 35 is filled with solder. The length direction of the second ribs 35 is arranged along the axial direction of the ring body 31, and the plurality of second ribs 35 are distributed along the axial direction and the circumferential direction of the ring body 31.
In the present embodiment, the first header 11 and the third header 21 are communicated at one connection ring 30, and the second header 12 and the fourth header 22 are not communicated at the other connection ring 30; alternatively, the first header 11 and the third header 21 are not communicated at one connection ring 30, and the second header 12 and the fourth header 22 are communicated at the other connection ring 30. Thus, the first heat exchanger 10 and the second heat exchanger 20 communicate at only one connection ring 30, facilitating the circuit setup.
Optionally, the outer ends of the headers are sealed off by end caps 50 to avoid leakage.
In this embodiment, a spacer 40 is disposed in the first collecting pipe 11, and the spacer 40 partitions the cavity of the first collecting pipe 11, so as to divide the cavity of the first collecting pipe 11 into a plurality of sub-cavities along the axial direction; and/or a spacer 40 is arranged in the second collecting pipe 12, and the spacer 40 separates the cavity of the second collecting pipe 12 so as to divide the cavity of the second collecting pipe 12 into a plurality of sub-cavities along the axial direction. That is, the first heat exchanger 10 is divided into a plurality of circuits, which are sequentially connected, by the partitions 40, and the circuits are channels through which fluid flows.
In this embodiment, a spacer 40 is disposed in the third collecting pipe 21, and the spacer 40 partitions the cavity of the third collecting pipe 21, so as to divide the cavity of the third collecting pipe 21 into a plurality of sub-cavities along the axial direction; and/or a spacer 40 is arranged in the fourth collecting pipe 22, and the spacer 40 separates the cavity of the fourth collecting pipe 22 so as to divide the cavity of the fourth collecting pipe 22 into a plurality of sub-cavities along the axial direction. That is, the second heat exchanger 20 is divided into a plurality of circuits, which are sequentially communicated, by the partitions 40, and the circuits are channels through which the fluid flows.
Further, the loop in the first heat exchanger 10 is communicated with the loop in the second heat exchanger 20, so that the step heat exchange is conveniently realized, and the heat exchange effect is improved. The circuit in the microchannel heat exchanger can be set as follows according to the needs: there are an even number of circuits in the first heat exchanger 10 and an odd number of circuits in the second heat exchanger 20, as shown in fig. 1; an even number of loops are arranged in the first heat exchanger 10, and an even number of loops are arranged in the second heat exchanger 20; an odd number of loops are arranged in the first heat exchanger 10, and an odd number of loops are arranged in the second heat exchanger 20, as shown in fig. 9; there are odd number of circuits in the first heat exchanger and even number of circuits in the second heat exchanger as shown in fig. 10.
In this embodiment, the upper first heat exchanger 10 may be used to pass superheated steam and a working medium in a gas-liquid mixed state, the lower second heat exchanger 20 may pass liquid and supercooled liquid, the high temperature region is distributed on the upper first heat exchanger 10, and the relatively low temperature region is distributed on the second heat exchanger 20. The connection ring 30 may be made of a conventional 3-series aluminum material, or may be made of a high-strength aluminum material to increase the connection strength.
Another embodiment of the present invention provides a production method for producing a microchannel heat exchanger, the production method including: the microchannel heat exchanger is designed to comprise at least two heat exchangers; respectively welding at least two heat exchangers in a brazing furnace; and then at least two heat exchangers are connected in sequence along the length direction of the heat exchangers so as to combine the microchannel heat exchangers.
Further, the microchannel heat exchanger includes a connection ring 30, connecting the two heat exchangers includes: the mutually corresponding collecting pipes of the two heat exchangers are respectively sleeved with the connecting ring 30; the mutually corresponding collecting pipes of the two heat exchangers are respectively welded and fixed with the connecting ring 30.
According to the technical scheme, the microchannel heat exchanger is designed in a split mode, namely at least two heat exchangers are included, the two heat exchangers are respectively welded in the brazing furnace, the problem that the microchannel heat exchanger cannot enter the brazing furnace for welding due to the fact that the overall size of the microchannel heat exchanger is too large is solved, then the two heat exchangers are connected in a combined mode through the two connecting rings 30, and therefore the large-size microchannel heat exchanger is formed. By adopting the technical scheme, the large-size micro-channel heat exchanger can be produced under the condition of not increasing additional equipment investment, the problem that the large-size micro-channel heat exchanger is difficult to produce is solved, and the production cost is reduced.
The technical scheme has the following beneficial effects: the total heat exchange area required by a client is unchanged, the heat exchange amount is unchanged, the product is divided into two heat exchangers according to the loop arrangement, the upper part is a superheated steam and gas-liquid mixed state heat exchanger, the lower part is a liquid and supercooled liquid heat exchanger, the temperature difference between the upper part and the lower part of the single heat exchanger is reduced, the stress deformation caused by large temperature difference between the upper end and the lower end of a single collecting pipe is reduced, the temperature difference stress deformation between the upper part and the lower part of the heat exchanger is reduced, and the service life of the heat exchanger is prolonged; the height of a single piece of the heat exchanger is less than 1550mm, the heat exchanger can be brazed on a mesh belt with the width of 1700mm, and the heat exchanger is formed by flame welding through a connecting ring after brazing, so that the requirement of a customer on large size is met, and the installation of the whole machine of the customer is not influenced; the process difficulty is small, the operation is simple, the product manufacturing efficiency is improved, and the technical process is feasible. The lower heat exchanger can be set to be smaller than the upper heat exchanger in size, the strength of the lower heat exchanger welded on the upper heat exchanger can meet the requirement, and the blasting test of the whole micro-channel heat exchanger also meets the requirement.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A microchannel heat exchanger, comprising:
the heat exchanger comprises a first heat exchanger (10), wherein the first heat exchanger (10) comprises a first collecting pipe (11), a second collecting pipe (12) and a plurality of first flat pipes (13) arranged between the first collecting pipe (11) and the second collecting pipe (12), and two ends of each first flat pipe (13) are respectively communicated with the first collecting pipe (11) and the second collecting pipe (12) in a one-to-one correspondence manner;
the second heat exchanger (20) comprises a third collecting pipe (21), a fourth collecting pipe (22) and a plurality of second flat pipes (23) arranged between the third collecting pipe (21) and the fourth collecting pipe (22), and two ends of each second flat pipe (23) are respectively communicated with the third collecting pipe (21) and the fourth collecting pipe (22) in a one-to-one correspondence manner;
at least two connecting rings (30), first pressure manifold (11) with third pressure manifold (21) is through one connecting ring (30) are connected, second pressure manifold (12) with fourth pressure manifold (22) is through another connecting ring (30) are connected.
2. The microchannel heat exchanger according to claim 1, wherein the first collecting pipe (11) and the third collecting pipe (21) are coaxially arranged, the second collecting pipe (12) and the fourth collecting pipe (22) are coaxially arranged, the first collecting pipe (11), the second collecting pipe (12), the third collecting pipe (21) and the fourth collecting pipe (22) have the same structure, the first flat pipe (13) and the second flat pipe (23) have the same structure, and the first flat pipe (13) and the second flat pipe (23) are arranged side by side.
3. The microchannel heat exchanger according to claim 1, wherein for the connecting ring (30) connecting the first header (11) and the third header (21): one end of the connecting ring (30) is sleeved with the end of the first collecting pipe (11), and the other end of the connecting ring (30) is sleeved with the end of the third collecting pipe (21).
4. The micro-channel heat exchanger according to claim 3, wherein a first conical surface (36) is arranged on the inner wall of one end of the connecting ring (30), a second conical surface (37) is arranged on the inner wall of the other end of the connecting ring (30), one end of the connecting ring (30) is sleeved on the end of the first collecting pipe (11), the first conical surface (36) is matched and connected with the first collecting pipe (11), the other end of the connecting ring (30) is sleeved on the end of the third collecting pipe (21), and the second conical surface (37) is matched and connected with the second collecting pipe (12).
5. The microchannel heat exchanger according to claim 3, wherein the connection ring (30) includes a ring body (31) and a first limit ring (32) disposed on an inner wall of the ring body (31), a end of the ring body (31) is disposed at an end of the first collecting pipe (11), an end surface of the first limit ring (32) abuts against an end surface of the first collecting pipe (11), another end of the ring body (31) is disposed at an end of the third collecting pipe (21), and another end surface of the first limit ring (32) abuts against an end surface of the third collecting pipe (21).
6. The microchannel heat exchanger as set forth in claim 5, wherein the connection ring (30) is fixedly connected to the first header (11) and the third header (21) by welding, and the connection ring (30) further includes:
the first ribs (33) are arranged on the inner wall of the ring body (31) at intervals, the first ribs (33) are distributed on two sides of the first limiting ring (32), and the area between every two adjacent first ribs (33) is used for filling solder.
7. The microchannel heat exchanger according to claim 3, wherein the connection ring (30) includes a ring body (31) and a second limiting ring (34) disposed on an outer wall of the ring body (31), one end of the ring body (31) is inserted into an end of the first collecting pipe (11), one end surface of the second limiting ring (34) abuts against an end surface of the first collecting pipe (11), the other end of the ring body (31) is inserted into an end of the third collecting pipe (21), and the other end surface of the second limiting ring (34) abuts against an end surface of the third collecting pipe (21).
8. The microchannel heat exchanger as set forth in claim 7, wherein the connection ring (30) is fixedly connected to the first header (11) and the third header (21) by welding, and the connection ring (30) further includes:
the second ribs (35) are arranged on the outer wall of the ring body (31) at intervals, the second ribs (35) are distributed on two sides of the second limiting ring (34), and the area between every two adjacent second ribs (35) is used for filling solder.
9. The microchannel heat exchanger of claim 1,
the first collecting pipe (11) and the third collecting pipe (21) are communicated at one connecting ring (30), and the second collecting pipe (12) and the fourth collecting pipe (22) are not communicated at the other connecting ring (30); or the like, or, alternatively,
the first collecting pipe (11) and the third collecting pipe (21) are not communicated at one connecting ring (30), and the second collecting pipe (12) and the fourth collecting pipe (22) are communicated at the other connecting ring (30).
10. The microchannel heat exchanger of claim 1,
a spacer (40) is arranged in the first collecting pipe (11), and the spacer (40) separates the cavity of the first collecting pipe (11) so as to divide the cavity of the first collecting pipe (11) into a plurality of sub-cavities along the axial direction;
and/or a spacer (40) is arranged in the second collecting pipe (12), and the spacer (40) separates the cavity of the second collecting pipe (12) so as to divide the cavity of the second collecting pipe (12) into a plurality of sub-cavities along the axial direction.
11. The microchannel heat exchanger of claim 1,
a spacer (40) is arranged in the third collecting pipe (21), and the spacer (40) separates the cavity of the third collecting pipe (21) so as to divide the cavity of the third collecting pipe (21) into a plurality of sub-cavities along the axial direction;
and/or a spacer (40) is arranged in the fourth collecting pipe (22), and the spacer (40) separates the cavity of the fourth collecting pipe (22) so as to divide the cavity of the fourth collecting pipe (22) into a plurality of sub-cavities along the axial direction.
12. A production process for producing a microchannel heat exchanger, the production process comprising:
the microchannel heat exchanger is designed to comprise at least two heat exchangers;
respectively welding the at least two heat exchangers in a brazing furnace;
and then connecting the at least two heat exchangers in sequence along the length direction of the heat exchangers to combine the microchannel heat exchangers.
13. The production method according to claim 12, wherein the microchannel heat exchanger comprises a connection ring (30), and connecting two of the heat exchangers comprises:
sleeving the mutually corresponding collecting pipes of the two heat exchangers with the connecting ring (30) respectively;
and respectively welding and fixing the mutually corresponding collecting pipes of the two heat exchangers with the connecting ring (30).
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