CN111928540A

CN111928540A - High-performance evaporator core

Info

Publication number: CN111928540A
Application number: CN202010679032.4A
Authority: CN
Inventors: 杨顺福
Original assignee: Sichuan Saite Refrigeration Equipment Co ltd
Current assignee: Sichuan Saite Refrigeration Equipment Co ltd
Priority date: 2020-07-15
Filing date: 2020-07-15
Publication date: 2020-11-13

Abstract

The invention discloses a high-performance evaporator core body, which comprises a collecting pipe and a core body positioned in the center of the collecting pipe; the core body comprises flat pipes and fins arranged on the flat pipes; the collecting pipe is arranged as a B-shaped pipe, and circular flow dividing holes with different apertures are formed in the collecting pipe; the thickness X of the core body is 27-33 mm. From pressure manifold structural design and mould structure, solved pressure manifold overflowing hole reposition of redundant personnel and the processing degree of difficulty problem to make overflowing hole size can satisfy refrigerant flow demand, reduce the internal resistance of core, improve core evaporator core refrigeration ability. On the other hand, the flow distributing holes of the collecting pipes are punched to form round holes, and the flow distributing holes can be processed in a mass production mode and are convenient to process. A special flat tube structure is adopted, so that the contact area between the flat tube and the fin is improved; the heat exchange capacity of the air side of the fins is optimized, and the heat exchange capacity of the core body is improved.

Description

High-performance evaporator core

Technical Field

The invention relates to the technical field of air conditioning systems, in particular to a high-performance evaporator core.

Background

The HVAC heat exchanger in the automobile air-conditioning industry adopts a parallel flow evaporator at present, and in order to form an 8-shaped collecting cavity with the refrigerant collecting and distributing functions, 3 modes are mainly adopted at present. A high performance evaporator core body with a B-shaped tube structure.

One is a haversian tube, and an 8-shaped cavity is formed by buckling a half-side W-shaped section and the other half of a W-shaped part which is formed by stamping, and the mode has the advantage that a flow distribution hole is convenient to process when a refrigerant flows between two cavities of the 8-shaped manifold; the defects are that the cost of the die is high, different dies are used for cores with different specifications, and the universality is poor; the other defect is that the buckling surfaces of the two W-shaped parts are more, the length direction of the welding seam is longer, and sealing leakage is easy to generate during brazing, so that the production yield is low.

The second type is a double-D-shaped pipe structure, an 8-shaped refrigerant cavity is formed by attaching and welding two D-shaped pipes, and a shunting hole is processed at the corresponding position of the joint surface of the two D-shaped pipes. The structure reduces the welding risk and saves the cost of a part die, but has the defect that when the D-shaped pipe is processed with the overflowing hole, the joint surfaces of the two D-shaped pipes need to be respectively processed and then welded at the corresponding positions, thereby increasing the processing time; meanwhile, the joint parts of the two D-shaped pipes are double-wall thick, so that the thickness of the core body is increased, and the material cost is also increased.

The third is to directly adopt B-shaped pipe section, do not need special forming stamping die, do not need the welding surface to guarantee the air tightness of the die cavity, the product percent of pass is high, the core is easy to thin, the material is saved; but the defects are that the processing difficulty of the shunting hole between the two 8-shaped cavities is high, the area of the processing hole is small, the internal resistance of the core body is large, and the service life of the die is short. Because the inner processing is limited to the perforation, the area of the shunting hole is increased by adopting the rectangular shunting hole in the industry at present.

In view of production cost and material cost, the evaporator core body manufactured by adopting the B-shaped pipe shunt has low cost and high qualification rate. However, the problems of designing and processing the internal shunt hole of the B-type tube need to be solved, and meanwhile, in order to thin the core, the heat dissipation capability of the core needs to be improved through structural design, so that the cold-weight ratio of the core is improved.

Disclosure of Invention

The invention aims to solve the problems of high processing difficulty and poor heat dissipation capability of the existing evaporator core body and provides a high-performance evaporator core body.

A high-performance evaporator core body comprises a collecting pipe and a core body positioned in the center of the collecting pipe; the core body comprises flat pipes and fins arranged on the flat pipes; a circular shunting hole is formed in the collecting pipe; the thickness X of the core body is 27-33 mm.

Further, the collecting pipe is arranged as a B-shaped pipe.

Further, the circular diversion holes are set to be different in hole size.

Furthermore, the side surface structure of the flat pipe is an oval multi-segment line tangent structure.

Furthermore, the contact length of the fins and the flat tubes is K, the width of the flat tubes is W, and K is larger than W-0.8 mm.

Furthermore, the windowing ventilation length of the fin is L, and the wave height of the fin is H, wherein L is more than H-0.6 mm.

Furthermore, a flow passage partition plate is arranged inside the collecting pipe.

Furthermore, the flow channel clapboard is profiled on the flow channel section of the collecting pipe.

The invention has the beneficial effects that: from pressure manifold structural design and mould structure, solved the problem of pressure manifold overflowing hole reposition of redundant personnel to make overflowing hole size can satisfy refrigerant flow demand, reduce the core internal resistance, improve core evaporator core refrigeration ability. On the other hand, the flow distributing holes of the collecting pipes are punched to form round holes, and the flow distributing holes can be processed in a mass production mode and are convenient to process. A special flat tube structure is adopted, so that the contact area between the flat tube and the fin is improved; the heat exchange capacity of the air side of the fins is optimized, and the heat exchange capacity of the core body is improved.

Drawings

FIG. 1 is a schematic front view of a core;

FIG. 2 is a schematic top view of the core;

FIG. 3 is a schematic view of a cross-sectional structure of a header;

FIG. 4 is a cross-sectional view of a flattened tube;

FIG. 5 is a partial schematic view of a fin;

FIG. 6 is a schematic view of a blanking structure of a B-type pipe;

in the figure, 1-collecting pipe, 2-core, 3-flat pipe, 4-fin, X-core thickness, K-fin and flat pipe contact length, W-flat pipe width, L-fin windowing ventilation length, H-fin wave height, 5-die punch A, 6-die punch B, 11-shunt hole, 51-die punch and 7-runner clapboard.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

Example 1:

as shown in fig. 1 to 5, a high performance evaporator core includes a header 1 and a core 2 located at the center of the header 1; the core body 2 comprises flat pipes 3 and fins 4 arranged on the flat pipes 3; a circular shunting hole 11 is formed in the collecting pipe 1; the thickness X of the core body 2 is 27-33 mm. The collecting pipe 1 is a B-shaped pipe. The circular diversion holes 11 are set to be different in aperture size.

As for the shape of the hole, the shortest circumference with the same area is circular, and the shearing force during punching of the hole can be reduced by adopting the circular hole design. A circular hole structure with a small ratio of punching length to punching area is adopted to ensure the sufficient flow cross section of the refrigerant; meanwhile, in order to ensure that the refrigerant in the B-type pipe can be distributed according to the requirement of the core body flow channel, the round holes are designed into different apertures at different positions through CFD fluid analysis, so that the uniformity of a temperature field when the whole core body refrigerant is evaporated is ensured, and the heat exchange capacity of the core body is improved.

To ensure the heat transfer area, the contact area of the flat tubes 3 to the fins 4 needs to be ensured. The contact length of the fins 4 and the flat tubes 3 is K, the width of the flat tubes 3 is W, and K is larger than W-0.8 mm.

The side face structure of the flat pipe 3 is an oval multi-segment line tangent structure. Adopt special flat tube structure size, change original flat tube 3 side structure from semi-circular to the tangent pitch arc of the multistage circular arc of similar oval minor axis side, when guaranteeing flat tube 3 pressure-bearing, improve flat tube 3 width direction and fin 4's contact length. In the scheme, the flat tubes 3 with the same width can improve the contact length by 12.1 percent in width.

The windowing ventilation length of the fin 4 is L, the wave height of the fin 4 is H, and L is larger than H-0.6 mm. By designing and adjusting the R angle of the rectangular fin, under the condition of the same wave distance P of the fin 4, the contact length L of the fin 4 and the flat tube 3 is increased to be larger than the wave distance P/2-0.6 mm; meanwhile, the windowing ventilation length of the fins 4 is increased to be larger than the wave height H-0.6mm of the fins 4, namely, the R angle of the fins is reduced by optimizing the structure of the cutter, namely, the contact area of the flat tubes 3 and the fins 4 is increased, and the heat transfer resistance is reduced; when the wave pitch P is 2.5mm, the contact length of the optimized fin can be improved by 33% and the windowing length of the fin is 7.6% by optimizing R to be less than 0.3.

And a flow passage partition plate 7 is also arranged in the collecting pipe 1. The flow channel clapboard 7 is profiled on the flow channel section of the collecting pipe 1. The uniformity of the refrigerant distributed to the flat tubes 3 can be improved; through the optimal design of the windowing angle of the fins 4, the heat exchange capacity of the core body in wind measurement is improved under the condition that the internal resistance of the core body in wind measurement is ensured.

Through the design, the capacity of the core body is improved by 5% -8% and the raw material is reduced by 11%.

Example 2

As shown in FIG. 6, the die adopts a B-type pipe double-core rod opposite-penetrating punching structure, so that the punching capability of the shunting hole is effectively improved.

In the aspect of processing the circular branch hole 11, two core rods are punched to penetrate through the collecting main 1, wherein the die punch A5 is provided with a die punch 51, and the die punch 51 is directly processed on the die punch A5 for increasing the punch strength. A circular knife edge is processed on the die punch B6, and corresponding materials on a middle rib plate of the B-shaped pipe are cut off through the relative motion of the upper punch and the lower punch to form a circular hole with required size. Because the ram is long in overhang, the ram needs to be made of materials with high hardness and high strength.

From B type tubular construction design and mould structure, solved B type pipe overflowing hole reposition of redundant personnel and the processing degree of difficulty problem to make overflowing hole size can satisfy refrigerant flow demand, reduce the core internal resistance, improve core evaporator core refrigeration ability, the volume production can be realized in the simultaneous processing, and processing is convenient.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. A high performance evaporator core characterized by: comprises a collecting pipe (1) and a core body (2) positioned in the center of the collecting pipe (1); the core body (2) comprises flat pipes (3) and fins (4) arranged at the flat pipes (3); a circular shunting hole (11) is formed in the collecting pipe (1); the thickness X of the core body (2) is 27-33 mm.

2. A high performance evaporator core as set forth in claim 1 wherein: the collecting pipe (1) is a B-shaped pipe.

3. A high performance evaporator core as set forth in claim 1 wherein: the circular shunting holes (11) are set to be different in aperture size.

4. A high performance evaporator core as set forth in claim 1 wherein: the side face structure of the flat pipe (3) is an oval multi-line tangent structure.

5. A high performance evaporator core as set forth in claim 1 wherein: the contact length of the fins (4) and the flat tubes (3) is K, the width of the flat tubes (3) is W, and K is larger than W-0.8 mm.

6. A high performance evaporator core as set forth in claim 1 wherein: the windowing ventilation length of the fins (4) is L, the wave height of the fins (4) is H, and L is larger than H-0.6 mm.

7. A high performance evaporator core as set forth in claim 1 wherein: and a flow passage partition plate (7) is also arranged in the collecting pipe (1).

8. A high performance evaporator core as set forth in claim 7 wherein: the flow channel partition plate (7) is profiled on the flow channel section of the collecting pipe (1).