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CN-121977372-A - Microchannel heat exchanger and manufacturing method thereof

CN121977372ACN 121977372 ACN121977372 ACN 121977372ACN-121977372-A

Abstract

The disclosure provides a microchannel heat exchanger and a manufacturing method thereof, and belongs to the technical field of heat exchange. The microchannel heat exchanger comprises a high-pressure collecting pipe and a plurality of flat pipes, wherein the flat pipes are parallel to each other and are connected with the high-pressure collecting pipe, the cross section of the high-pressure collecting pipe is circular, and the ratio of the wall thickness of the high-pressure collecting pipe to the outer diameter of the high-pressure collecting pipe is more than or equal to 10%. The pressure bearing capacity of the micro-channel heat exchanger can be remarkably improved.

Inventors

  • WEI XIAOYONG
  • LIU AIXUE

Assignees

  • 博格思众（常州）热交换器有限公司

Dates

Publication Date
20260505
Application Date
20260204

Claims (10)

  1. 1. The microchannel heat exchanger is characterized by comprising a high-pressure collecting pipe (1) and a plurality of flat pipes (2), wherein the flat pipes (2) are parallel to each other and are connected with the high-pressure collecting pipe (1); the cross section of the high-pressure collecting pipe (1) is circular, and the ratio of the wall thickness of the high-pressure collecting pipe (1) to the outer diameter of the high-pressure collecting pipe is more than or equal to 10%.
  2. 2. The microchannel heat exchanger according to claim 1, wherein the high pressure header (1) comprises a header body (11) and a cylindrical soldering lug (12) wrapped around the outer surface of the header body (11); the welding lug (12) is in interference fit with the collecting pipe body (11), and the ratio of the wall thickness of the collecting pipe body (11) to the outer diameter of the collecting pipe body is more than or equal to 10%.
  3. 3. The microchannel heat exchanger according to claim 2, wherein the header body (11) is an integrally formed structural member formed once after hot extrusion of an aluminum alloy ingot.
  4. 4. The microchannel heat exchanger according to claim 2, wherein the thickness of the fins (12) is 0.1mm-1mm.
  5. 5. The microchannel heat exchanger according to claim 2, further comprising a baffle (3), the baffle (3) being located inside the header body (11), and opposite faces of the baffle (3) having a solder layer welded to the header body (11).
  6. 6. The microchannel heat exchanger according to claim 5, wherein the thickness of the separator plate (3) is greater than or equal to the wall thickness of the header body (11).
  7. 7. The microchannel heat exchanger according to any one of claims 1 to 6, wherein a plurality of flat tube holes (20) are provided in each flat tube (2) at uniform intervals along the width direction thereof, each flat tube hole (20) extending from one end to the other end of the flat tube (2) where it is located; The ratio of the wall thickness of the flat pipe hole (20) to the thickness of the flat pipe (2) is more than or equal to 22 percent.
  8. 8. The microchannel heat exchanger according to claim 7, wherein the ratio of the number of flat tube holes (20) on each flat tube (2) to the width of the flat tube (2) is not less than 1/mm.
  9. 9. A method of making a microchannel heat exchanger, the method comprising: The high-pressure collecting pipe is formed by processing, the cross section of the high-pressure collecting pipe is round, the wall thickness of the high-pressure collecting pipe the ratio of the outer diameter of the steel plate to the inner diameter of the steel plate is more than or equal to 10 percent; And connecting a plurality of mutually parallel flat pipes with the high-pressure collecting pipe.
  10. 10. The method of manufacturing of claim 9, wherein the processing forms a high pressure manifold comprising: heating an aluminum alloy ingot to an extrusion temperature, and then feeding the aluminum alloy ingot into an extruder, and continuously extruding and forming the aluminum alloy ingot into an aluminum round tube through an annular extrusion die; wrapping the cylindrical welding lug on the outer surface of the aluminum round tube; And (3) carrying out stamping forming on the welding lug and the aluminum round tube to obtain the high-pressure collecting pipe.

Description

Microchannel heat exchanger and manufacturing method thereof Technical Field The disclosure belongs to the technical field of heat exchange, and in particular relates to a micro-channel heat exchanger and a manufacturing method thereof. Background In refrigeration, air conditioning and heat pump systems, microchannel heat exchangers are widely used due to their high efficiency, compactness and light weight. A microchannel heat exchanger typically includes two headers, a plurality of flat tubes connected between the two headers, and fins disposed between adjacent flat tubes. The collecting pipe is a key bearing member. In the related art, the collecting pipe of the micro-channel heat exchanger is generally obtained by directly forming through a high-frequency induction welding pipe process. Limited by the process level, the ratio of wall thickness to outside diameter of the header is typically around 6%. This makes the heat exchanger suitable only for use in low pressure environments, i.e. operating pressures not higher than 5MPa. However, as heat exchanger systems move to higher energy efficiency and harsher work, the operating pressures of the systems are significantly increased, such as above 5MPa, the above thin-walled header designs face challenges of insufficient strength, and unacceptable deformation and even failure risks may occur under long-term high pressure, rendering the microchannel heat exchangers unacceptable for use in high pressure systems. Disclosure of Invention The embodiment of the disclosure provides a microchannel heat exchanger and a manufacturing method thereof, which can obviously improve the pressure bearing capacity of the microchannel heat exchanger. The technical scheme is as follows: The embodiment of the disclosure provides a microchannel heat exchanger, which comprises a high-pressure collecting pipe and a plurality of flat pipes, wherein the flat pipes are parallel to each other and are connected with the high-pressure collecting pipe, the cross section of the high-pressure collecting pipe is circular, and the ratio of the wall thickness of the high-pressure collecting pipe to the outer diameter of the high-pressure collecting pipe is more than or equal to 10%. In a further implementation mode of the high-pressure collecting pipe comprises a collecting pipe body and a cylindrical welding lug wrapped on the outer surface of the collecting pipe body, wherein the welding lug is in interference fit with the collecting pipe body, and the ratio of the wall thickness of the collecting pipe body to the outer diameter of the collecting pipe body is more than or equal to 10%. In yet another implementation of the present disclosure, the manifold body is an integrally formed structural member that is formed once after hot extrusion of an aluminum alloy ingot. In yet another implementation of the present disclosure, the tab has a thickness of 0.1mm-1mm. In yet another implementation of the present disclosure, the microchannel heat exchanger further comprises a baffle plate, the baffle plate is located inside the header body, and two opposite plate surfaces of the baffle plate are provided with a solder layer welded with the header body. In yet another implementation of the present disclosure, the separator plate has a thickness that is greater than or equal to a wall thickness of the header body. In another implementation mode of the present disclosure, a plurality of flat tube holes are uniformly distributed at intervals along the width direction of each flat tube inside each flat tube, each flat tube hole extends from one end of the flat tube to the other end, and the ratio of the wall thickness of the flat tube hole to the thickness of the flat tube is greater than or equal to 22%. In yet another implementation of the present disclosure, the ratio of the number of flat tube holes on each flat tube to the width of the flat tube at which it is located is greater than or equal to 1/mm. In another aspect, the present disclosure further provides a method for manufacturing a microchannel heat exchanger, the method comprising: The high-pressure collecting pipe is formed by processing, the cross section of the high-pressure collecting pipe is round, the ratio of the wall thickness of the high-pressure collecting pipe to the outer diameter of the high-pressure collecting pipe is more than or equal to 10%, and a plurality of mutually parallel flat pipes are connected with the high-pressure collecting pipe. In another implementation mode of the method, the processing to form the high-pressure collecting pipe comprises the steps of heating an aluminum alloy ingot to an extrusion temperature, feeding the aluminum alloy ingot into an extruder, continuously extruding and forming the aluminum alloy ingot into an aluminum round pipe through an annular extrusion die, wrapping a cylindrical welding lug on the outer surface of the aluminum round pipe, and stamping and forming the welding lug and the alu