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CN-122015536-A - Heat exchange assembly capable of preventing end interference and assembling method thereof

CN122015536ACN 122015536 ACN122015536 ACN 122015536ACN-122015536-A

Abstract

The invention discloses a heat exchange assembly capable of preventing end interference and an assembly method thereof, and relates to the technical field of heat exchanger assembly. The flat tube aims to solve the technical problem that physical space interference is caused by thick collecting pipes at the end parts when the traditional flat tube is assembled with a flat base plate. The assembly comprises a heat exchange substrate, a current collecting part and a flat heat exchange tube. The flat heat exchange tube is artificially divided into a flat heat exchange section which is closely attached to the heat exchange substrate and a bent connection section which is outwards separated from the plane of the substrate and tilted. The current collecting part is connected to the bending connection section. Through the height compensation provided by the bending connection section, the thick current collecting part is suspended to avoid the substrate, so that a non-contact space avoidance gap is formed. The invention thoroughly eliminates physical collision and realizes 100% zero-distance lamination of the core heat exchange tube section and the base plate.

Inventors

  • XI ZHIWU

Assignees

  • 武汉凯沃森工业科技有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. An end interference prevention heat exchange assembly, comprising: A heat exchange substrate having a flat surface; a manifold member having a manifold chamber therein, an outer profile of the manifold member having a first thickness dimension; The heat exchange tube comprises at least one flat heat exchange tube, wherein the interior of the flat heat exchange tube is provided with a channel for fluid to circulate, and the outer profile of the flat heat exchange tube is provided with a second thickness dimension; The flat heat exchange tube sequentially comprises a flat heat exchange section and at least one bending connecting section along the extending direction of the flat heat exchange tube, and the tail end of the bending connecting section is communicated with the current collecting part; The bottom surface of the flat heat exchange section is attached to and fixedly connected with the flat surface of the heat exchange substrate, and the bent connecting section is bent in a direction away from the plane where the flat surface of the heat exchange substrate is located, so that the current collecting part connected to the tail end of the bent connecting section is arranged in a suspended mode, and a space avoiding gap without physical contact is formed between the outer wall of the current collecting part and the flat surface of the heat exchange substrate.
  2. 2. The heat exchange assembly of claim 1, wherein the bent connection section has a bent deflection angle relative to a plane of the flat heat exchange section, and the bent deflection angle is configured such that a level of a lowest profile bus of the current collecting member facing the heat exchange substrate is higher than or parallel to a level of a flat surface of the heat exchange substrate.
  3. 3. The end interference prevention heat exchange assembly of claim 2 wherein said bend deflection angle is defined in a range of 5 degrees to 45 degrees and said bend connection section has a bend radius greater than 3 times said flat heat exchange tube second thickness dimension to prevent throttling collapse of said channel at the bend.
  4. 4. The heat exchange assembly capable of preventing end interference according to claim 1, wherein the flat heat exchange tube is a multi-cavity microchannel special tube with a specific cross-sectional shape, and the cross sections of the flat heat exchange tube are alternately distributed with attaching heat exchange areas with the thickness equal to the second thickness dimension and thinning avoidance areas with the thickness smaller than the second thickness dimension along the width direction; the plastic deformation hinge of the bending connecting section is concentrated in the thinning avoidance area so as to protect the channel section in the fitting heat exchange area from being damaged by bending moment stress.
  5. 5. The heat exchange assembly of claim 4, wherein a metal brazing layer is formed between the bottom surface of the bonded heat exchange region and the flat surface of the heat exchange substrate; And the bottom surface of the thinning avoidance area is thinned to form a non-welding drainage channel between the flat heat exchange tube and the heat exchange substrate, and the non-welding drainage channel is used for accommodating redundant solder overflowed from the metal brazing layer in a high-temperature melting state.
  6. 6. The heat exchange assembly of claim 1, wherein the header is a cylindrical metal tube, a semicircular metal tube or a metal cavity having a rectangular cross section, and the flat heat exchange tube is inserted into and sealed in an assembly gap formed in a side wall of the header at an end of the bent connection section.
  7. 7. The end interference prevention heat exchange assembly according to any one of claims 1 to 6, wherein said heat exchange assembly comprises a plurality of said flat heat exchange tubes parallel to each other; The heat exchange substrate is a metal extrusion part with a hollow inside, and a convection chamber is arranged in the heat exchange substrate and is used for air flow or phase change energy storage material filling.
  8. 8. A method of assembling an end interference prevention heat exchange assembly according to any one of claims 1 to 7, comprising the steps of: preparing at least one straight flat heat exchange tube, a current collecting part and a heat exchange substrate with a flat surface; Placing the flat heat exchange tube in a bending die, applying normal force to the end part of the flat heat exchange tube to enable the flat heat exchange tube to generate plastic deformation, forming a bending connecting section tilting to one side at the end part, and reserving an undeformed middle area as a straight heat exchange section; Butting and pre-fixing the current collecting part and the tail end of the bending connecting section to form a pipe network framework; The pipe network framework is placed on the flat surface of the heat exchange substrate, and the bending connecting section provides geometric height compensation, so that the current collecting part is suspended and supported on the flat surface by the bending connecting section, and meanwhile, the bottom surface of the flat heat exchange section is in full-area contact with the flat surface; and under the condition of keeping the full-area contact and the suspension avoidance state of the current collecting part, an undetachable fixing process is implemented on the contact surface of the straight heat exchange section and the heat exchange substrate.
  9. 9. The assembly method according to claim 8, wherein the fixing process is an in-furnace brazing process, a brazing material layer with a set thickness is coated on the flat surface of the heat exchange substrate in advance, the flat heat exchange section presses the brazing material layer by self gravity during placement, and the suspension height of the bent connecting section is configured such that after the brazing material layer is melted in the brazing furnace and micro-settlement of the flat heat exchange section occurs, the outer wall of the current collecting part does not contact and interfere with the heat exchange substrate.
  10. 10. The assembly method according to claim 8, wherein the bending die comprises a lower die having an inclined molding surface, and the lifting height of the bending connection section from the reference plane is precisely controlled by controlling the angle of the inclined molding surface of the lower die so as to be greater than or equal to the radius size of the current collecting member.

Description

Heat exchange assembly capable of preventing end interference and assembling method thereof Technical Field The invention relates to the technical field of heat exchanger structural design and precise refrigeration assembly, in particular to an end interference prevention heat exchange component capable of solving the problem of component assembly interference and reducing contact thermal resistance through three-dimensional reconstruction of a fluid pipeline end space and an assembly method thereof. Background With the continuous evolution of modern refrigeration technology to compact, high-efficiency and light weight, flat heat exchange tubes are widely applied to various high-end thermal management systems, such as evaporators of vehicle-mounted refrigerators and the like, due to extremely high specific surface area and heat transfer coefficient. In many practical system-level applications, the heat exchanger is generally constructed by laying a plurality of flat heat exchange tubes on a large-area heat exchange substrate (such as an aluminum plate with an air duct) in a side-by-side manner. To achieve uniform distribution and collection of fluids, the ends of the flat heat exchange tubes must be connected to a manifold stem, commonly referred to in the industry as a "manifold" or "distributor. However, this conventional system-level assembly architecture suffers from an extremely fatal and ubiquitous physical space interferometry defect: In order to reduce the fluidic resistance of the system as a whole, the current collecting member must have a sufficient internal flow cross-sectional area, and therefore must have an external diameter dimension significantly greater than the thickness dimension of the flat heat exchange tube itself. If the traditional linear flat heat exchange tube is directly welded with the current collecting part during assembly, a straight plate pipe network extending on the same horizontal plane is formed, and when the pipe network is horizontally placed on a heat exchange substrate, the thick current collecting part can first bottom. The current collecting part is like a 'cushion block', and the main body area of the flat heat exchange tube is forced to be overhead, so that the flat heat exchange tube cannot be contacted with the flat surface of the heat exchange substrate. This physical interference caused by the difference in end dimensions results in a large air gap (contact resistance) between the flat heat exchange tubes of the core and the base plate, which can cause the heat exchange efficiency of the entire heat exchange assembly to exhibit a dimpled appearance. To address this interference, the prior art has generally been forced to "dig slots" or "punch-down" in the heat exchange substrate to accommodate the coarse header. But this not only damages the strength of the heat exchange substrate, but also greatly increases the processing cost. Therefore, how to thoroughly eliminate the end interference and realize zero-distance bonding of the flat tube and the substrate on the premise of not damaging the structure of the substrate and not reducing the pipe diameter of the current collecting part is a core engineering problem to be solved in the field. Disclosure of Invention Aiming at the defects in the background art, the invention provides a heat exchange component capable of preventing end interference, an assembly method thereof and refrigeration equipment, and aims to solve the core technical problems of physical interference, overhead suspension of a heat exchange surface, overlarge contact thermal resistance, high substrate processing cost and the like caused by overlarge size of an end collecting pipe when the traditional flat tube heat exchanger is assembled with a flat substrate. In order to solve the technical problems, in a first aspect, the present invention provides the following technical solutions: A heat exchange assembly capable of preventing end interference is characterized by comprising a heat exchange substrate with a flat surface, a current collecting part, at least one flat heat exchange tube and a heat exchange plate, wherein a current collecting cavity is formed in the current collecting part, a first thickness dimension is formed in the outer side outline of the current collecting part, a channel for fluid circulation is formed in the flat heat exchange tube, a second thickness dimension is formed in the outer side outline of the flat heat exchange tube, the first thickness dimension is larger than the second thickness dimension, the flat heat exchange tube sequentially comprises a flat heat exchange section and at least one bending connecting section along the extending direction of the flat heat exchange tube, the tail end of the bending connecting section is communicated with the current collecting part, the bottom surface of the flat heat exchange section is attached to and fixedly connected with the flat surface of the heat exchange substrate