CN115540643A

CN115540643A - Working fluid channel sheet and heat exchanger with same

Info

Publication number: CN115540643A
Application number: CN202111159484.0A
Authority: CN
Inventors: 王凱建; 吴佳承
Original assignee: Zhejiang Xuebolan Technology Co Ltd
Current assignee: Zhejiang Xuebolan Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-09-30
Publication date: 2022-12-30
Also published as: CN115540642A; CN115540648A; CN115540651A; CN115540649A; CN115540645A; CN115540647A; CN115540655A; CN115540650A; CN115540644A; CN115540654A; CN115540652A

Abstract

The invention provides a working fluid channel sheet and a heat exchanger with the same, wherein the working fluid channel sheet comprises a heat exchange area; the heat exchange zone is provided with two groups of inlets and outlets, one group of the inlets and outlets are communicated with the heat exchange zone, and the other group of the inlets and outlets are isolated from the heat exchange zone through a barrier; and the enclosure frame is arranged around the heat exchange area, the inlet and the outlet. The invention has the advantages that the structure is surrounded in the middle by the surrounding frame, the appearance is neat, and the internal structure is effectively protected.

Description

Working fluid channel sheet and heat exchanger with same

Technical Field

The invention relates to the technical field of heat exchange, in particular to a working fluid channel sheet and a heat exchanger with the same.

Background

A heat exchanger (heat exchanger) is a system for transferring heat between two or more fluids, and is used to heat or cool an object by transferring heat from a hot fluid to a cold fluid based on the property of transferring heat from a high temperature to a low temperature.

The microchannel heat exchanger is a novel heat exchanger formed by alternately stacking a first working fluid channel sheet provided with a first working fluid channel and a second working fluid channel sheet provided with a second working fluid channel. However, the two working fluid passage sheets are generally provided at the edges with inlet and outlet ports communicating with the working fluid passages, and the shapes thereof are irregular and the structures of the inlet and outlet ports are easily damaged during the manufacturing process.

In view of the above, there is a need for a new working fluid channel sheet and a heat exchanger having the same.

Disclosure of Invention

The invention aims to provide a working fluid channel sheet and a heat exchanger with the same.

In order to solve one of the technical problems, the invention adopts the following technical scheme:

a working fluid channel plate comprises a heat exchange area; the heat exchange zone is provided with two groups of inlets and outlets, one group of the inlets and outlets are communicated with the heat exchange zone, and the other group of the inlets and outlets are isolated from the heat exchange zone through a surrounding baffle; an enclosure disposed around the heat transfer zone, the inlet, and the outlet.

Furthermore, the heat exchange zone is provided with a plurality of microstructures, the distance between an inlet and an outlet which are communicated with the heat exchange zone and a row of microstructures closest to the inlet and the outlet is L1, the distance between the inlet and the outlet which are isolated from the heat exchange zone and a row of microstructures closest to the inlet and the outlet is L2, and L1 is less than L2.

Furthermore, an inlet and an outlet which are communicated with the heat exchange area are respectively not more than the distance between adjacent microstructures in the arrangement direction of the row of microstructures closest to the inlet and the outlet; and/or L2 is larger than the distance between adjacent microstructures in the arrangement direction of the inlet and the outlet which are arranged in a way of being separated from the heat exchange zone and the row of microstructures closest to the inlet and the outlet.

Further, L2 is 1.5-4 times of the distance between two adjacent rows of microstructures.

Furthermore, an inlet and an outlet which are communicated with the heat exchange area are respectively arranged on two sides of the heat exchange area along the O-Y direction, the inlet and the outlet which are arranged in a way of being separated from the heat exchange area are respectively arranged on two sides of the heat exchange area along the O-Y direction, a plurality of microstructures are distributed along a plurality of sine lines extending along the O-X direction, and the sine lines are arranged at intervals along the O-Y direction.

Further, L1 is not more than the distance between two adjacent sine lines; and/or L2 is more than or equal to 1.5-4 times of the distance between two adjacent sine lines.

Further, the working fluid channel sheet comprises microstructure sheets stacked along the O-Z direction and gaskets of the microstructure sheets, the heat exchange region is arranged on the microstructure sheets, the two groups of inlets and outlets penetrate through the gaskets of the microstructure sheets along the thickness direction, and the gaskets of the microstructure sheets form the enclosure and the enclosure frame.

Further, the microstructure piece comprises the heat exchange area, an inlet through hole corresponding to the inlet, an outlet through hole corresponding to the outlet, and a first surrounding frame corresponding to the surrounding frame; the gasket of the microstructure piece comprises a heat exchange hollowed-out area corresponding to the heat exchange area, an inlet through hole and an outlet through hole which are communicated with the heat exchange area, an inlet hollowed-out area corresponding to the inlet through hole which is separated from the heat exchange area, an outlet hollowed-out area corresponding to the outlet through hole which is separated from the heat exchange area, the enclosure, and a second enclosure frame corresponding to the enclosure frame.

Furthermore, the heat exchange area is provided with a plurality of microstructures, and the microstructures are the same as the thickness of the gasket of the microstructure piece.

A heat exchanger comprises a plurality of working fluid channel sheets, wherein the working fluid channel sheets are stacked along the O-Z direction, a working fluid channel for circulating a working fluid is formed between every two adjacent working fluid channel sheets, one of the adjacent working fluid channels is communicated with one group of inlets and outlets, and the other working fluid channel is communicated with the other group of inlets and outlets.

The invention has the beneficial effects that: enclose the frame through the setting and enclose its structure in the centre, the outward appearance is neat, and has carried out effective protection to inner structure.

Drawings

FIG. 1 is a schematic diagram of a heat exchanger according to an embodiment of the present invention;

FIG. 2 is a partially exploded view of FIG. 2 at another angle;

FIG. 3 is a schematic view of the heat exchanger of FIG. 1 with several microstructured sheets and shims stacked, shown in perspective view;

FIG. 4 is an enlarged view of a portion of FIG. 3;

fig. 5 is a schematic view of the first microstructured sheet of fig. 1 stacked with a spacer of the first microstructured sheet;

FIG. 6 is a schematic diagram of the first microstructured sheet of FIG. 5;

FIG. 7 is a schematic diagram of a shim of the first microstructured sheet of FIG. 5;

FIG. 8 is a schematic view of the second microstructured sheet of FIG. 1 stacked with a shim of the second microstructured sheet;

FIG. 9 is a schematic diagram of the second microstructured sheet of FIG. 8;

FIG. 10 is a schematic diagram of a shim of the second microstructured sheet of FIG. 8;

FIG. 11 is a schematic view of the structure of the first sheet in a preferred embodiment;

FIG. 12 is a schematic representation of a plurality of microstructured plates and shims in an alternate embodiment of the present invention shown in perspective view after stacking;

FIG. 13 is an enlarged partial view of FIG. 12;

fig. 14 is a schematic structural view of the first microstructured sheet of fig. 12;

FIG. 15 is a schematic diagram of a shim of the first microstructured sheet of FIG. 12;

fig. 16 is a schematic structural view of the second microstructured sheet of fig. 12;

fig. 17 is a schematic view of a spacer of the second microstructured sheet of fig. 12.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

In the various drawings of the present invention, some dimensions of structures or portions are exaggerated relative to other structures or portions for convenience of illustration, and thus, are used only to illustrate the basic structure of the subject matter of the present invention.

The invention is based on the thermal resistance balance theory, the stamping process and the atomic diffusion combination process, and aims to design the heat exchanger 100 which has low manufacturing cost, is suitable for batch production, has a compact structure and good heat exchange performance and the preparation method thereof. Some of the designs may be used for heat exchangers 100 made by other processes.

Fig. 1 to 11 show a first embodiment of the present invention, and fig. 12 to 17 show a second embodiment of the present invention. For convenience of description, a coordinate system O-XYZ is set.

The heat exchanger 100 comprises a plurality of working fluid channel sheets 1, the working fluid channel sheets 1 extend along the O-XY direction, the working fluid channel sheets 1 are stacked along the O-Z direction, a working fluid channel for the circulation of a working fluid is formed between every two adjacent working fluid channel sheets 1, the edge of each working fluid channel sheet 1 is provided with an inlet 2 and an outlet 3 which are communicated with the working fluid channel, and the inlets 2 and the outlets 3 of every two adjacent working fluid channel sheets 1 are arranged along the O-XY direction in a staggered mode.

The two adjacent working fluid channels are respectively used for circulating a first working fluid and a second working fluid, and heat transfer is carried out when a temperature difference exists between the first working fluid and the second working fluid. The first working fluid and the second working fluid are two working fluids which exchange heat according to setting, and the two working fluids can be made of the same material and have different temperatures, or can be made of different materials and have different temperatures.

The following description will be given of the features common to the two types of embodiments.

Referring to fig. 1 to 17, the working fluid channel sheet 1 includes an inlet 2, an outlet 3, and a heat exchange region 4 located between the inlet 2 and the outlet 3, wherein the heat exchange region 4 is provided with a plurality of microstructures 5, and the working fluid channel is divided into a plurality of parallel or cross-connected microchannels, so as to improve the heat exchange performance of the heat exchanger 100.

The size and spacing of the microstructures 5 affect the heat exchange performance and pressure loss. In a preferred embodiment, the equivalent diameter of the microstructure 5 is not greater than 0.7mm, preferably not less than 0.5mm; the distance between two adjacent microstructures 5 is between 0.5mm and 2.5mm, preferably between 1mm and 1.5 mm.

Specifically, the working fluid channel sheet 1 further includes a dam 6 disposed around the heat exchange region 4, and the dam 6 is located on the side where the microstructures 5 are disposed, and prevents the working fluid from flowing outward. The inlet 2 and the outlet 3 are arranged on the box dam 6 or positioned at the inner side of the box dam facing the heat exchange area 4.

The plurality of microstructures 5 are arranged at intervals along a plurality of sinusoidal lines, and the plurality of sinusoidal lines are arranged at intervals from the side where the inlet 2 is located to the side where the outlet 3 is located. The microstructures 5 are arranged according to the sine line, the simple microstructures 5 can be used for playing the role of a sine line-shaped drainage structure, the production difficulty of the microstructures 5 is simplified, meanwhile, the working fluid has the tendency of flowing along the sine line, the flow disturbing effect is good, and the heat exchange performance is guaranteed.

In a preferred embodiment, the inlet 2 and the outlet 3 are respectively disposed on two sides of the heat exchange zone 4 along the O-Y direction, the sine lines extend along the O-X direction, and a plurality of sine lines are arranged at intervals along the O-Y direction, after the working fluid enters the working fluid channel from the inlet 2, the working fluid is disturbed by a plurality of microstructures 5, like waves on the seaside, and the back waves push the front waves to gradually move downstream to the outlet 3; the microstructures 5 induce the fluid to form a smooth flow phenomenon before or after, and have large fluid disturbance and good heat exchange performance.

Preferably, the plurality of microstructures 5 arranged along the sine line have the same pitch along the O-X direction, that is, the plurality of microstructures 5 distributed along the sine line project onto the same straight line along the O-Y direction, and the projections are uniformly distributed along the O-X direction. Therefore, when the adjacent working fluid channel sheets 1 are superposed on each other, the supporting/bonding points of the adjacent two working fluid channel sheets 1 are uniform.

Further, the microstructures 5 distributed along two adjacent sinusoidal lines are arranged in a staggered manner along the O-X direction, that is, the projection of each microstructure 5 on the adjacent sinusoidal line along the O-Y direction is located in the middle of two adjacent microstructures 5 on the projected sinusoidal line. The uniformity of the supporting/combining points of the whole area is further improved, meanwhile, the disturbance to the working fluid is increased, and the heat exchange performance is improved.

In addition, the heat exchange area 4 includes a turbulent flow area 43 and transition areas 44 located at both sides of the turbulent flow area 43 in the direction from the inlet 2 to the outlet 3. The arrangement density of the microstructures 5 of the turbulent zone 43 is greater than the arrangement density of the microstructures 5 of the transition zone 44. Specifically, the number of microstructures 5 on any sinusoidal line in the transition region 44 is less than the number of microstructures 5 on any sinusoidal line in the turbulent zone 43; and/or the spacing of adjacent sinusoidal lines in the transition region 44 is greater than the spacing of adjacent sinusoidal lines in the turbulent region 43.

As shown in fig. 3, 5-6, 8-9, 11-12, 14, and 16, the number of microstructures 5 on any sinusoidal line in the transition region 44 is less than the number of microstructures 5 on any sinusoidal line in the turbulent zone 43; the distance between two adjacent sinusoidal lines in the turbulent zone 43 and the transition zone 44 is the same, preferably the minimum value which can be achieved by the existing process, so that the size of the heat exchanger 100 along the O-Y direction is shortened while the heat exchange performance is ensured.

The provision of the turbulent flow region 43 can improve the heat exchange performance of the same-area heat exchange region 4 by 30%, and the wider the width of the turbulent flow region 43 in the O-Y direction, the better the heat exchange performance. The width of the turbulent zone 43 is set to: 1) The width of the turbulent flow zone 43 is less than or equal to 3mm, preferably 2 mm-3 mm; or 2) the width of the turbulent zone 43 can accommodate the number of the sine lines to be less than or equal to 3, preferably 2 to 3.

The two width setting modes take the heat exchange performance of the turbulent flow region 43, the size of the heat exchanger 100, the preparation process, the pressure loss and other factors into consideration, and on the premise of ensuring the heat exchange performance, the length of the heat exchanger 100 along the O-Y direction is minimum, so that the material is saved, and the occupied space is small; if the turbulent flow region 43 is further widened, the improvement of the heat exchange performance is not significant, but the pressure loss and the flow loss are greatly increased.

In addition, when the microstructure 5 is formed by punching, a corresponding cavity is formed on the other side of the microstructure. If the microstructures 5 of two adjacent working fluid channel sheets 1 and the arrangement mode thereof are the same, the microstructure 5 of one working fluid channel sheet 1 is opposite to the corresponding concave cavity on the other working fluid channel sheet 1 during lamination, and atomic diffusion bonding cannot be realized under stress. In order to solve the technical problem, as shown in fig. 3 to 4 and fig. 12 to 13, the central points of the microstructures 5 of two adjacent working fluid channel sheets 1 are aligned along the O-XY direction, that is, the connecting line of the two central points is parallel to the O-Z direction, and the supporting/bonding points of two adjacent working fluid channel sheets 1 are aligned, so as to avoid the problem that the bonding points are broken due to different pressures of two working fluids; meanwhile, the microstructures 5 of two adjacent working fluid channel sheets 1 have different shapes, so that each microstructure 5 has a part of area which does not correspond to the cavity of the adjacent microstructure sheet 13 and is overlapped with the area around the cavity to realize atomic diffusion bonding.

When the microstructure 5 is a symmetrical graph, the central symmetrical point of the microstructure is a central point; when the microstructure 5 is an asymmetric pattern, the center of an equivalent circle with equal area after edge normalization is taken as a central point.

The working fluid channel sheet 1 is divided into two types for the first working fluid and the second working fluid, and the heat exchanger 100 includes first working fluid channel sheets 11 and second working fluid channel sheets 12 alternately stacked in the O-Z direction. The first working fluid channel sheet 11 includes a first microstructure 51 and a first cavity formed by punching; the second working fluid channel sheet 12 includes a second cavity of the stamped second microstructure 52. The first microstructure 51 and the second microstructure 52 are different, the first working fluid channel plate 11, the first microstructure 51, and the second working fluid channel plate 12 define a first working fluid channel, and the second working fluid channel plate 12, the second microstructure 52, and the first working fluid channel plate 11 define a second working fluid channel.

Referring to fig. 3 to 4 and fig. 12 to 13, the superposition of the first microstructure 51 and the second microstructure 52 is illustrated. In the O-XY direction, a part of the first edge portion 511 of the first microstructure 51 exceeds the second microstructure 52, that is, a projection of a part of the first edge portion 511 on the second working fluid channel sheet 12 along the O-Z direction exceeds the second microstructure 52, and the exceeding part is attached to the periphery of the second cavity to serve as a supporting/bonding point when two adjacent working fluid channel sheets 1 are overlapped; and/or, a part of the second edge portion 521 of the second microstructure 52 exceeds the first microstructure 51, that is, the projection of the part of the second edge portion 521 on the first working fluid channel sheet 11 along the O-Z direction exceeds the first microstructure 51, and the exceeding part is attached to the periphery of the first cavity to serve as a supporting/bonding point when the adjacent working fluid channel sheets 1 are overlapped.

Preferably, in order to ensure effective atomic diffusion bonding, the area of each excess portion is not less than 0.04mm ² Preferably, the following components: 0.04mm ² ～0.06mm ^2， For example 0.05mm ² . Considering the problem of chamfering of the machined convex edge, the length of the first edge portion 511 in the O-Y direction beyond the second microstructure 52 is not less than 0.15mm; the length of the second edge portion 521 beyond the first microstructure 51 in the O-Y direction is not less than 0.15mm, and the two excess lengths may be the same or different.

The first microstructure 51 and the second microstructure 52 are projected in the same O-XY plane along the O-Z direction, the first edge portion 511 and the second edge portion 521 do not overlap, and the supporting/bonding points are dispersed in different areas. Preferably, the projection of the center point of the first microstructure 51 is regarded as the center of a circle, and the projections of the first edge portion 511 and the second edge portion 521 are uniformly arranged along the circumferential direction of the center of a circle, so that the supporting/bonding force is more uniform. More preferably, the projection distances of the first edge portion 511 and the second edge portion 521 from the center of the circle are different, so that the inner layer and the outer layer are arranged in a multilayer manner, and the supporting/combining effect is better.

In one embodiment, at least one and preferably two first edge portions 511 of the first microstructures 51 in the O-Y direction extend beyond the second microstructures 52; at least one and preferably two second edge portions 521 of the second microstructure 52 along the O-X direction exceed the first microstructure 51 to form a four-corner support, so that the bonding strength is stronger.

In another embodiment, the length of the first microstructure 51 along the O-Y direction is greater than the length along the O-X direction, the length of the second microstructure 52 along the O-Y direction is less than or equal to the length along the O-X direction, the length of the first microstructure 51 along the O-Y direction is greater than the length of the second microstructure 52, and the length of the first microstructure 51 along the O-X direction is less than the length of the second microstructure 52.

For example, the first microstructure 51 is in an oval shape or a gourd shape, the second microstructure 52 is in a diamond shape, or a shuttle shape or a round shape with two ends in the longitudinal direction forming an included angle, both ends of the first microstructure 51 in the O-Y direction exceed the second microstructure 52, and both ends of the second microstructure 52 in the O-X direction exceed the first microstructure 51.

When the heat exchanger 100 is formed by stacking, the first working fluid channel sheet 11 and the second working fluid channel sheet 12 are alternately stacked along the O-Z direction, and the center points of the first microstructure 51 and the second microstructure 52 are aligned along the O-XY direction, so that the adjacent working fluid channel sheets 1 can be supported and combined with each other.

In addition, the heat exchanger 100 may be used in a variety of applications, such as a condenser or an evaporator in a refrigeration system, where the first working fluid is a high-pressure, two-phase refrigerant and the second working fluid is a low-pressure, single-phase water. In order to accommodate working fluids of different temperatures and/or phase states and/or pressures, the first working fluid channel plate 11 comprises a first heat transfer zone 41 having a first microstructure 51, a first inlet 21 and a first outlet 31 communicating with said first heat transfer zone 41. The second working fluid channel sheet 12 comprises a second heat transfer zone 42 having a second microstructure 52, a second inlet 22 and a second outlet 32 in communication with the second heat transfer zone 42; the first microstructure 51 on the side facing the first inlet 21 and the second microstructure 52 on the side facing the second inlet 22 are different in shape and different in the first contact part of the first working fluid and the second working fluid, and are designed for different working fluids, so that the heat exchange performance and the pressure loss are balanced.

In one embodiment, the first microstructure 51 is in a circular arc shape on a side facing the first inlet 21, so that the design of the stamping die is easy and the production yield is high, for example, the first microstructure 51 is in an oval or gourd shape.

One side of the second microstructure 52 facing the inlet 2 is in a sharp angle shape, the included angle is not more than 90 degrees, the flow loss is small, and the heat exchange performance between the second working fluid and the second microstructure 52 is good based on the leading edge effect; for example, the second microstructure is a diamond shape or a fusiform shape with two longitudinal ends forming an included angle.

The structure of the box dam 6 will be described in detail below.

The inner edge 143 of the dam 6 facing the heat transfer zone 4 is in contact with the working fluid, also having an influence on its flow. In the invention, the shape of part of the inner edge 143 is the same as the arrangement shape of the microstructure 5 in the row nearest to the inner edge 143, and the turbulence tendency of the edge 143 to the working fluid is the same as that of the adjacent microstructure 5.

Specifically, the shape of the inner edge 143 extending in the flow direction of the working fluid is the same as the arrangement of the row of the microstructures 5 near the inner edge 143, and thus the flow tendency of the working fluid at the edge is substantially the same as that of the working fluid at the middle region. The flow direction of the working fluid is not an actual flow direction, but refers to a direction from a side where the inlet 2 is provided to a side where the outlet 3 is provided. Preferably, the inner edge 143 extending in the flow direction of the working fluid is the same distance as the row of the microstructures 5 adjacent to the inner edge; the different regions have the same tendency to disturb the working fluid.

The inlet 2 and the outlet 3 are respectively arranged at two opposite sides of the dam 6, the shape of the inner edge 143 at the inlet 2 side is consistent with the arrangement shape of the row of microstructures 5 nearest to the inner edge, and the inner edge is equivalent to the row of microstructures 5 at the upstream of the nearest row of microstructures 5; the thrust and the resistance of the working fluid in the advancing direction of the working fluid are similar, and the working fluid is prevented from being greatly rebounded at the edge of the heat exchange area 4 to cause larger flow loss. Preferably, the distance between the inner edge 143 of the side where the inlet 2 is located and the row of the microstructures 5 closest to the inner edge 143 is equal, and the turbulence tendency of the working fluid is the same in different areas.

And/or the shape of the inner edge 143 of the side of the outlet 3 corresponds to the arrangement shape of the row of the microstructures 5 nearest to the inner edge 143, and the inner edge corresponds to the row of the microstructures 5 downstream of the nearest row of the microstructures 5; the thrust and the resistance of the working fluid in the advancing direction of the working fluid are similar, and the working fluid is prevented from being greatly rebounded at the edge of the heat exchange area 4 to cause larger flow loss. Preferably, the shape of the inner edge 143 on the side of the outlet 3 is equal to the distance between the microstructures 5 in the row closest to the inner edge 143, and the turbulence tendency of the working fluid is the same in different regions.

In a specific embodiment, the inlet 2 and the outlet 3 are respectively disposed on two sides of the dam 6 along the O-Y direction, the plurality of microstructures 5 are distributed along a plurality of sinusoidal lines extending along the O-X direction, the microstructures 5 on adjacent sinusoidal lines are arranged in a staggered manner along the extending direction of the sinusoidal lines, and a row of microstructures 5 along the flowing direction of the working fluid and located at the edge are wavy. The inner edges 143 of the weirs 6 at both sides in the O-Y direction are also formed in a sine line shape, and the inner edges 143 extending in the flow direction of the working fluid are formed in a wave shape.

Further, the gap between each inner edge 143 and the microstructure 5 is the same as the gap between the microstructures 5 adjacent to each other in the same direction, so that the turbulent flow effect on the working fluid is consistent.

The distribution of the inlet 2 and the outlet 3 on the two working fluid channel pieces is described below.

On the same working fluid channel sheet 1, the inlet 2 and the outlet 3 are respectively arranged on two sides in the O-Y direction and are arranged along the O-X direction in a staggered manner, namely the inlet 2 and the outlet 3 are arranged like opposite angles. The working fluid has long circulation distance, and the heat exchange performance is improved.

Preferably, the first inlet 21 and the second outlet 32 are positioned on one side of the heat exchanger 100, and the first outlet 31 and the second inlet 22 are positioned on the other side of the heat exchanger 100; therefore, all the inlets 2 and the outlets 3 are integrated on two opposite sides of the heat exchanger 100, so that subsequent processes such as external connection of inlet and outlet pipelines and the like are facilitated, the structure is more compact, and the occupied volume is small.

Preferably, the first inlet 21 is side by side with the second outlet 32 in the O-X direction; the second inlet 22 is juxtaposed to the first outlet 31 in the O-X direction; therefore, the first inlet 21 and the first outlet 31 are arranged diagonally, the second inlet 22 and the second outlet 32 are arranged diagonally, the first working fluid and the second working fluid are in opposite flow, and the heat exchange effect is good.

When the heat exchanger 100 is used as a condenser, the first working fluid is a refrigerant that is two-phase gas and liquid, has a high pressure, and has a large temperature difference with the working fluid passage plate 1, and the second working fluid is low-pressure water. In one embodiment, the width of the second outlet 32 is greater than the width of the first inlet 21, and the width of the second inlet 22 is greater than the width of the first outlet 31 along the O-X direction, so as to ensure the flow rate of water and the temperature after heat exchange. In another embodiment, the widths of the first inlet 21 and the first outlet 32 are different, the gaseous refrigerant enters from the wider first inlet 21 with a large pressure, and then the liquid refrigerant exits from the narrower first outlet 32 with a balanced pressure during the whole flow process; the widths of the second inlet 22 and the second outlet 32 are the same, ensuring smooth flow of water. When the heat exchanger 100 is used as an evaporator, the first inlet and the first outlet are reversed.

The working fluid channel sheet 1 will be further described in detail in connection with the manufacturing process.

When the working fluid channel sheet 1 is an integral body, it is only suitable for forming the microstructures 5 and the dams 6 on a thicker sheet by a physical/chemical etching process, and is not suitable for a stamping process.

Referring to fig. 1 to 17, the working fluid channel sheet 1 of the present invention is designed as a split type, and includes a microstructure sheet 13 and a spacer 14 (hereinafter referred to as a spacer) of the microstructure sheet stacked in the O-Z direction. Specifically, the first working fluid channel plate 11 includes a first microstructure plate 131, a first microstructure plate spacer 141 (hereinafter referred to as a first spacer 141); the second working fluid channel plate 12 includes a second microstructure plate 132 and a second microstructure plate spacer 142 (hereinafter referred to as a second spacer 142). The first microstructure sheet 131 and the second microstructure sheet 132 are collectively referred to as a microstructure sheet 13, and the first spacer 141 and the second spacer 142 are collectively referred to as a spacer 14.

The shape of the microstructure sheet 13 is the same as that of the working fluid channel sheet 1 when viewed from the O-Z direction, and the microstructure sheet 13 includes the heat exchange region 4 and an edge region disposed around the heat exchange region 4. The gasket 14 and the edge region have the same shape, the gasket 14 is arranged on the edge region at the side provided with the microstructure 5, and the dam 6 is formed around the heat exchange region 4; all the above description of the box dam 6 applies to the gasket 14.

According to the invention, the working fluid channel sheet 1 is divided into two parts along the O-Z direction, the microstructure 5 is arranged on the microstructure sheet 13, the microstructure sheet 13 and the gasket 14 can be respectively formed by adopting a stamping process, and then the dam 6 is formed by laminating the sheets through the gasket 14, so that the other side corresponding to the dam 6 has no cavity, and the two parts can be further combined together through atomic diffusion bonding. Compared with the traditional photoetching process, the production cost is low, the method is suitable for batch production and has small environmental pollution.

The smaller the thicknesses of the microstructure pieces 13 and the gaskets 14 are, the lighter the weight of the finally formed heat exchanger 100 is, the lower the thermal resistance is, and the better the heat exchange performance is. Based on the current sheet material and its properties, limitations of the stamping process, etc., the thickness of the microstructured sheet 13 and the spacer 14 is between 0.07mm and 0.1mm, such as 0.1mm, 0.09mm, 0.08mm, 0.075mm, 0.07mm. The thickness of the invention is preferably below 0.1mm, and the thermal resistance is small, but the invention provides great challenges for the process.

The microstructures 5 formed by stamping in the heat exchange area 4 of the microstructure piece 13 are hollow bulges, gaps among a plurality of microstructures are communicated to form microchannels, fluid is divided into a plurality of small branches for heat exchange, and the heat exchange performance is improved.

The larger the thickness of the microstructure sheet 13 is, the larger the diameter and the strength of the microstructure 5 are, and the smaller the distance between adjacent microstructures 5 are, and the stronger the pressure resistance of the microstructure sheet 13 to the first working fluid and the second working fluid on both sides thereof is; on the contrary, the lower the withstand voltage. The thickness of the microstructure sheet 13 is determined by the thickness of the sheet, the height of the microstructure 5 is not less than the thickness of the gasket 14, preferably the height of the microstructure 5 is consistent with the height of the gasket 14, when the lamination and pressurization are carried out, the slightly higher microstructure 5 can be slightly deformed, and the effective contact between the microstructure 5 and the adjacent microstructure sheet 13 can be ensured, which is a necessary condition for atomic diffusion bonding. Specifically, the thickness of the spacer 14 is less than or equal to the thickness of the microstructure sheet 13, and the height of the microstructure is adaptively adjusted according to the thickness of the spacer 14. In the invention, the gasket 14 and the microstructure sheet 13 have the same thickness and are respectively formed by the same sheet material.

Considering the performance of the stamping die and the microstructure sheet, the equivalent diameter of the microstructure 5 is not more than 0.7mm, preferably not less than 0.5mm, and the distance between two adjacent microstructures 5 is 0.5 mm-2.5 mm, preferably 1 mm-1.5 mm.

The gasket 14 surrounds the dam 6 forming the working fluid channel around the heat transfer zone 4. The width of the gasket 14 is designed according to the pressure resistance of the heat exchanger 100 and the atomic diffusion bonding process, and is, for example, between 2.5mm and 5mm, preferably 3mm.

The gasket 14 has the same outer contour as the heat exchanger 100, and the inner edge 143 facing the heat exchange zone 4 is in contact with the working fluid, in particular with reference to the inner edge 143 of the dam 6.

In addition, no matter the structure is split or integrated, the areas around the inlet 2 and the outlet 3 on the working fluid channel sheet 1 are provided with the diversion surfaces 10 for guiding the working fluid, the diversion surfaces 10 are in an inclined plane shape or a step shape, and when the fluids such as the refrigerant, the water and the like are guided to enter the heat exchange area 4, the fluid faces not a wall but a plurality of inlets with the diversion surfaces 10. In a split structure, the drainage surface 10 is formed by the microstructure sheet and the spacer of the microstructure sheet, for example, the edge is designed to be uneven, and the inner and outer layers are uneven to form the step-shaped drainage surface 10.

Preferably, the flow guide surface 10 is located between the inlet 2 and the heat transfer zone 4 or between the outlet 3 and the heat transfer zone 4.

Or preferably, the arc angle of the inlet 2 and the outlet 3 on the side facing the heat exchange zone 4 is smaller than that on the side facing away from the heat exchange zone 4, so as to form the flow guide surface 10.

The design of the present invention will be described in detail below with reference to fig. 1 to 11:

the first working fluid channel sheet 11 and the first working fluid channel sheet 12 both comprise a heat exchange area 4, two groups of inlets 2 and outlets 3 arranged around the heat exchange area 4, and an enclosure frame 15. The inlet and the outlet are both communicated along the thickness direction of the microstructure sheet 13.

The heat exchange area 4 is provided with a plurality of the microstructures 5, and the structures and the arrangement modes of the microstructures 5 are as described above and are not described again. One group of the inlet 2 and the outlet 3 are communicated with the heat exchange area 4; the other group of inlets 2 and outlets 3 are separated from the heat exchange area 4 by a barrier 16, and the working fluid entering from the inlets 2 cannot enter the heat exchange area 4.

Taking the first working fluid channel sheet 11 as an example, the first inlet 21 and the first outlet 31 are communicated with the heat exchange area 4, and the second inlet 22 and the second outlet 32 are isolated from the heat exchange area 4 by the enclosure 16, for example, two sets of the inlet 2 and the outlet 3 will be described.

The distance between the first inlet 21 and the first outlet 31 communicated with the heat exchange region 4 and the row of the microstructures 5 closest to the first inlet 31 is small, the distance between the first inlet 21 and the first outlet 31 is equivalent to the distance between the adjacent microstructures 5 in the direction, the microstructures 5 are arranged in the regions close to the first inlet 21 and the first outlet 31, the adjacent microstructure pieces 13 are uniformly supported, sufficient bonding strength is formed after atomic diffusion bonding, and meanwhile, the first working fluid is ensured to smoothly pass through.

The second inlet 22 and the second outlet 32 which are arranged separately from the heat exchange zone 4 are separated from the heat exchange zone 4 by the enclosure 16, and in order to ensure the separation effect, the distance between the second inlet 22 and the second outlet 32 and the row of microstructures 5 closest to the second inlet is large and is larger than the distance between adjacent microstructures 5 in the direction.

Specifically, the distance between each of the first inlet 21 and the first outlet 31 and the closest row of microstructures 5 is L1, the distance between each of the second inlet 22 and the second outlet 32 and the closest row of microstructures 5 is L2, and L1 is less than L2. The width of the enclosure 16 is less than or equal to L2.

In one embodiment, in the arrangement direction of the first inlet 21 and the first outlet 31 and the row of microstructures 5 closest to the first inlet and the first outlet, L1 is not less than the distance between adjacent microstructures 5, and the support/bonding strength at the inlet and the outlet is high; and/or in the arrangement direction of the second inlet 22 and the second outlet 32 and the row of the microstructures 5 closest to the second inlet and the second outlet, L2 is greater than the distance between the adjacent microstructures 5, so as to ensure effective partition.

Further, L2 is 1.5 to 4 times, for example, 2 times or 3 times, the distance between two adjacent rows of microstructures 5.

In another embodiment, the first inlet 21 and the first outlet 31 are respectively disposed on two sides of the heat transfer region 4 along the O-Y direction, the second inlet 22 and the second outlet 32 are respectively disposed on two sides of the heat transfer region 4 along the O-Y direction, and the plurality of microstructures 5 are distributed along a plurality of sinusoidal lines extending along the O-X direction, and the plurality of sinusoidal lines are arranged at intervals along the O-Y direction.

Preferably, L1 ≦ the distance between two adjacent sinusoidal lines; and/or L2 is more than or equal to 1.5 to 4 times, such as 2 times and 3 times, of the distance between two adjacent sinusoidal lines, and 1 or 2 or 3 sinusoidal lines can be accommodated in the width.

The sizes of the inlet 2 and the outlet 3 are generally set according to the pressure and the flow rate of the working fluid. In the invention, the first inlet 21 and the first outlet 31 are respectively arranged at two sides of the heat exchange area 4 along the O-Y direction, the second inlet 22 and the second outlet 32 are also respectively arranged at two sides of the heat exchange area 4 along the O-Y direction, and along the O-X direction, the widths of the first inlet 21 and the first outlet 31 are smaller than the widths of the second inlet 22 and the second outlet 32, so that when the first working fluid is a refrigerant and the second working fluid is water, the heat exchange performance and the pressure loss are both optimal.

Specifically, in the O-X direction, the width of the second inlet 22 and the second outlet 32 is greater than 1/2 of the width of the heat exchange zone 4; the lateral distance of the second working fluid inlet/outlet 3 is large, and the larger the width is, the more the second working fluid tends to pass straight through the heat transfer zone 4, and the smaller the pressure loss is.

Preferably, the width of the second inlet 22 and the second outlet 32 is 1/2 to 4/5, such as 2/3,3/4; the second working fluid channel is similar to a center line straight-through structure, and the flow loss is small.

In one embodiment, the first inlet 21 and the second outlet 32 are located at one side of the heat transfer zone 4 along the O-Y direction, and both are arranged along the O-X direction; the first outlet 31 and the second inlet 22 are located on the other side of the heat transfer zone 4 along the O-Y direction, and are arranged along the O-X direction. Preferably, in the O-X direction, the first inlet 21 and the first outlet 31 are arranged in a staggered manner, the second inlet 22 and the second outlet 32 are arranged in a staggered manner, and the first working fluid and the second working fluid are in counter flow, so that the heat exchange performance is improved.

In another embodiment, the width of the first inlet 21 is greater than that of the first outlet 31, and the width of the second outlet 32 is less than that of the first outlet 31, which is suitable for a condenser in which the first inlet 21 communicates with a compressor.

Preferably, the width of the enclosure 16 is the same as that of the enclosure frame 15, so that high combination degree of all the parts is ensured, the pressure bearing capacity of working fluid is the same, and the phenomenon of leakage of the working fluid is avoided; the remaining areas are distributed by the inlet 2, the outlet 3, which are located on the same side.

Further, in order to enable the stamping process, the working fluid channel sheet 1 includes a microstructure sheet 13 and a spacer 14 of the microstructure sheet stacked in the O-Z direction.

The microstructure piece 13 includes the heat transfer area 4, a first inlet through hole 21', the first outlet through hole 31', the second inlet through hole 22', the second outlet through hole 32', and a first surrounding frame corresponding to the surrounding frame 15. The first inlet through hole 21', the first outlet through hole 31', the second inlet through hole 22', and the second outlet through hole 32' all penetrate through the microstructure sheet 13 in the thickness direction.

The microstructure sheet 13 includes a first microstructure sheet 131 and a second microstructure sheet 132 adapted to different working fluids. The micro-structure sheet 13 and the gasket 14 have the same outer contour, for example, both are square, and the material is saved most.

The first microstructure sheet 131 comprises a first heat transfer area 41, a first inlet through hole 21 'and a second outlet through hole 32' which are arranged on one side of the first heat transfer area 41 along the O-Y direction and are arranged along the O-X direction, a first outlet through hole 31 'and a second inlet through hole 22' which are arranged on the other side of the first heat transfer area 41 along the O-Y direction and are arranged along the O-X direction, and a first surrounding frame. The first inlet through hole 21', the second outlet through hole 32', the first outlet through hole 31', the second inlet through hole 22' and the first enclosing frame are positioned at the edge area; the first inlet through hole 21 'and the first outlet through hole 31' communicate with the first heat exchanging zone 41, and the second inlet through hole 22 'and the second outlet through hole 32' are provided separately from the first heat exchanging zone 41 by the baffle 16.

The second microstructure sheet 132 includes a second heat transfer region 42, a first inlet through hole 21 'and a second outlet through hole 32' disposed on one side of the second heat transfer region 42 along the O-Y direction and arranged along the O-X direction, a first outlet through hole 31 'and a second inlet through hole 22' disposed on the other side of the second heat transfer region 42 along the O-Y direction and arranged along the O-X direction, and a first enclosure. The first inlet through hole 21', the second outlet through hole 32', the first outlet through hole 31', the second inlet through hole 22', and the first enclosure frame are disposed in the edge region. The differences from the first microstructured sheet 131 are: the first inlet through hole 21', the first outlet through hole 31' and the first heat exchanging zone 41 are provided separately by the enclosure 16, and the second inlet through hole 22', the second outlet through hole 32' and the first heat exchanging zone 41 communicate with each other.

Specifically, the distance between the first inlet through hole 21 'and the first outlet through hole 31' provided separately from the second heat transfer region 42 and the closest row of microstructures 5 is L1, the distance between the second inlet through hole 22 'and the second outlet through hole 32' communicating with the second heat transfer region 42 and the closest row of microstructures 5 is L2, and L1 > L2. Further, L1 > the distance between adjacent microstructures 5 in this direction; and/or L2 is less than or equal to the distance between adjacent microstructures 5 in the direction. Preferably, L1 is 1.5 to 4 times, e.g. 2 times, 3 times, the distance between two adjacent rows of microstructures 5 in the direction. Or L1 is more than or equal to 1.5-4 times of the distance between two adjacent sinusoidal lines, and one or two sinusoidal lines can be contained in the width range of L2; and/or L2 is less than or equal to the distance between two adjacent sine lines.

The gasket 14 includes: a heat exchange hollow-out area 144 corresponding to the heat exchange area 4, an inlet through hole 2 'and an outlet through hole 3' communicated with the heat exchange area 4, an inlet hollow-out area 145 corresponding to the inlet through hole 2 'separately arranged from the heat exchange area 4, an outlet hollow-out area 146 corresponding to the outlet through hole 3' separately arranged from the heat exchange area 4, the enclosure 16, and a second enclosure frame corresponding to the enclosure frame 15.

The heat exchange hollow-out region 144 is referred to as an inlet 2 at a portion corresponding to the inlet through hole 2', and is referred to as an outlet 3 at a portion corresponding to the outlet through hole 3'. And for simplicity of description, the inlet penetration hole 2 'may also be referred to as an inlet, and the outlet penetration hole 3' may also be referred to as an outlet.

The heat exchange hollow-out areas 144, the inlet hollow-out areas 145 and the outlet hollow-out areas 146 are through along the thickness direction of the gasket 14, and the baffles 16 are located between the inlet hollow-out areas 145 and the heat exchange hollow-out areas 144 and between the outlet hollow-out areas 146 and the heat exchange hollow-out areas 144; the second enclosing frame encloses a plurality of hollow-out areas together and is integrally in a piece shape. After lamination, the first surrounding frame and the second surrounding frame form the surrounding frame 15.

The inner edge 143 of the gasket 14 surrounding the heat exchange hollow-out area 144 is arranged in the same manner as described above, and has the same shape as the arrangement shape of the row of microstructures 5 closest to the inner edge, preferably the same distance as the distance between the row of microstructures 5 closest to the inner edge, and more preferably the same distance as the distance between the adjacent rows of microstructures 5 in the same direction.

Specifically, the spacer 14 includes a first spacer 141 cooperating with the first microstructure piece 131, and a second spacer 142 cooperating with the second microstructure piece 132.

The first gasket 141 includes a first heat exchange hollow area corresponding to the first heat exchange area 41, the first inlet through hole 21 'and the first outlet through hole 31', a second inlet hollow area corresponding to the second inlet through hole 22', a second outlet hollow area corresponding to the second outlet through hole 32', and a second enclosure corresponding to the enclosure 15.

The second gasket 142 includes a second heat exchange hollow corresponding to the second heat exchange area 42, the second inlet through hole 22 'and the second outlet through hole 32', a first inlet hollow corresponding to the first inlet through hole 21', a first outlet hollow corresponding to the first outlet through hole 31', and a second enclosure corresponding to the enclosure 15.

The invention also adopts the external structure substrate 71 as the substrate and the external structure working fluid inlet and outlet sheet 72 as the sealing cover, the thickness of the two is 2-3 mm, the pressure bearing capacity is strong, and the internal working fluid channel sheet 1 is protected.

The preparation method of the heat exchanger is mainly divided into two steps of lamination and atomic diffusion.

The preparation method of the heat exchanger comprises the following steps: forming a plurality of the first working fluid channel pieces 11; forming the second working fluid channel sheet 12 as described above; after cleaning, the first working fluid channel plate 11 and the second working fluid channel plate 12 are alternately stacked between the external substrate 71 and the external working fluid inlet/outlet plate 72 along the O-Z direction; and pressurizing by a tool fixture to perform atomic diffusion bonding.

Specifically, the preparation method of the heat exchanger comprises the following steps: stamping to form the first microstructure sheet 131, the first spacer 141, the second microstructure sheet 132, and the second spacer 142; after cleaning, at least one repeating unit is superposed on the outer structure substrate 71 to a set height in the order of the first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132, and the second gasket 142, and then the outer structure working fluid inlet and outlet sheet 72 is capped and pressurized by a tool fixture. Wherein the repeating unit can be an integer, and can be 1/4, 2/4 or 3/4 more than the integer.

The atomic diffusion bonding of all examples herein was done in a vacuum oven at a vacuum pressure of 4X 10 ^-3 Pa, applying pressure surface pressure of 5MPa and temperature of about 1100 ℃. The diffusion bonding of the atoms completes the body of the heat exchanger 100.

After superposition, the first inflow cavity 81 is formed by the first inlet through holes 21', the first heat exchange hollow-out areas 144 and the first inlet hollow-out areas, and the first outflow cavity 83 is formed by the second outlet through holes 32', the first heat exchange hollow-out areas 144 and the first outlet hollow-out areas; then, a first inflow pipe 82 or a first inflow pipe joint communicating with the first inflow chamber 81, and a first outflow pipe 84 or a first outflow pipe joint communicating with the first outflow chamber 83 are connected to the exterior working fluid inlet and outlet sheet 72. The first working fluid enters the first inflow chamber 81, enters the first flow channel through the first inlets 21 after being buffered and mixed, and then flows out through the first outflow chamber 83.

The extending direction of the first inflow pipe 82 or the first inflow pipe joint intersects with the arrangement direction of the first inlet 21 and the first heat exchange area 41, preferably is vertical, namely the direction of the first working fluid flowing into the first inflow cavity 81 from the first inflow pipe 82 or the first inflow pipe joint intersects with the direction of the first working fluid flowing into the first heat exchange area 41 through the first inlet 21, preferably is vertical, and is suitable for high-pressure two-phase first working fluid, such as refrigerant; the first working fluid can enter the first channel after entering the first inflow cavity 81 through bending, so that uniform mixing is increased under impact force, gas-liquid separation is avoided, only gaseous working fluid exists in part of the first working fluid channels, and the heat exchange performance is poor.

The plurality of second inlet through holes 22', the plurality of second heat exchange hollow-out areas 144 and the plurality of second inlet hollow-out areas form a second inflow cavity 85, the plurality of second outlet through holes 32', the plurality of second heat exchange hollow-out areas 144 and the plurality of second outlet hollow-out areas form a second outflow cavity 87, the first enclosing frame and the second enclosing frame form an enclosing wall, and then a second inflow pipe or a second inflow pipe joint 86 communicated with the second inflow cavity 85 and a second outflow pipe or a second outflow pipe joint 88 communicated with the second outflow cavity 87 are connected to the enclosing wall. The second working fluid enters the second inflow chamber 85, is mixed in a buffering manner, enters the second working fluid channel through the second inlets 22, and then is converged into the second outflow chamber 87 to flow out.

Preferably, the second inflow pipe or the second inflow pipe joint 86 extends in the same direction as the second inlet 22 and the second heat transfer area 42. The second working fluid, such as water, enters the second inflow chamber 85, is buffered and distributed to the plurality of second working fluid channels, and the pressure loss is small due to the consistent flow direction.

Specifically, a connecting port communicated with the second inflow cavity 85 is formed on the enclosing wall through numerically-controlled machine tool cutting, and then the second inflow pipe or the second inflow pipe joint 86 is welded at the connecting port. Compared with the first class of embodiments, the external embedded welding of the first inflow cover plate, the first outflow cover plate, the second inflow cover plate and the second outflow cover plate is omitted, and the reliability is improved. The machine tool cuts into the inlet or outlet area a as illustrated in fig. 17.

The first inflow pipe 82 or a first inflow pipe joint, the first outflow pipe 84 or the first inflow pipe joint, the second inflow pipe or the second inflow pipe joint 86, and the second outflow pipe or the second outflow pipe joint 88 are bonded to the main body of the heat exchanger 100 by welding after atomic diffusion bonding, and the order of the bonding can be adjusted.

The preparation method of the heat exchanger further comprises the following steps: stamping a first microstructure 51 in the first heat exchange area 41; stamping a second microstructure 52 at the second heat transfer zone 42, wherein the first microstructure 51 and the second microstructure 52 are different in shape as described above; when lamination is carried out along the O-Z direction, the central points of the first microstructure 51 and the second microstructure 52 are aligned along the O-XY direction, so that the adjacent working fluid channel sheets 1 can be supported and combined mutually; other details are the same as above and are not described again.

In addition, based on the same outer contours of the microstructure sheet 13 and the gasket 14, the following method is adopted in the invention: forming at least two stamping sheets on the plurality of first sheets, the plurality of second sheets, the plurality of third sheets and the plurality of fourth sheets according to the same arrangement mode, wherein the stamping sheets on the first sheets comprise at least one of the first microstructure sheets 131, the first gaskets 141, the second microstructure sheets 132 and the second gaskets 142; the punching sheets at corresponding positions in the first sheet, the second sheet, the third sheet and the fourth sheet are arranged according to the circulation sequence of the first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132 and the first microstructure sheet 131; stacking at least one repeating unit between the exterior base sheet 71 and the exterior working fluid inlet and outlet sheet 72 in the order of the first sheet, the second sheet, the third sheet, and the fourth sheet; and then the two sheets are bonded by atomic diffusion, and then the two sheets are cut between two adjacent punching sheets after bonding to form a plurality of heat exchangers 100.

According to the method, a plurality of compact heat exchangers 4 can be formed at the same time, so that the production efficiency is improved; and only need form location structure or prevent slow-witted structure or location and prevent slow-witted structure in the edge or the middle zone of first sheet, second sheet, third sheet, fourth sheet can, need not to form location structure etc. on every punching press piece, practiced thrift the material of punching press piece.

Preferably, as shown in fig. 11, the plurality of punched sheets on the first sheet are the same kind of punched sheets, the plurality of formed micro heat exchangers 100 are completely the same, and the punched sheets on the same sheet have the same shape, which is convenient for production and inspection. For example, a plurality of first microstructure pieces 131 are formed on a first sheet by punching, first microstructure pieces 131 with the same number and uniform arrangement are formed on a second sheet by punching, and second microstructure pieces 132 with the same number and uniform arrangement are formed on a third sheet by punching; the same number and arrangement of second pads 142 are formed on the fourth sheet.

Of course, the plurality of punched sheets on the first sheet material can also comprise at least two kinds of punched sheets, and the stress of the whole sheet material is more harmonious.

And according to the size of the sheet material, the number of the punching sheets formed on the first sheet material is as follows: 2, or 4, or 6 or 8.

In addition, on the basis of the above preparation method, further, the same gasket 14 is adjacent to the external base sheet 71 and the external working fluid inlet and outlet sheet 72, so that the fluids on both sides of the heat exchanger 100 in the stacking direction are the same fluid, when the heat exchanger 100 is put into use, the working fluid which actively provides cold or heat passes through the working fluid channel adjacent to the external base sheet 71 and the external working fluid inlet and outlet sheet 72, and the other fluid which passively acquires energy is surrounded by the fluid which actively provides energy, that is, both sides of the working fluid which passively acquires energy can acquire energy from the fluid which actively provides energy, and the heat exchange performance is better.

For example, when the heat exchanger 100 is used as a condenser or an evaporator, the first working fluid is a refrigerant, the second working fluid is water, the first gasket 141 is provided adjacent to the external base plate 71 and the external working fluid inlet/outlet plate 72, the refrigerant surrounds the water, and both sides of any water flow layer exchange heat with the refrigerant, so that the heat exchange performance is good.

Referring to fig. 12 to fig. 17, the second embodiment of the present invention is different from the first embodiment only in that:

the shapes of the first inlet 21, the first outlet 31, the second inlet 22 and the second outlet 32 are slightly different, and one side of the inlet facing the heat exchange area 4 is more gradually designed relative to the other sides, so that the flow guide surface 10 is formed.

The first microstructure sheet 131, the first gasket 141, the second microstructure sheet 132 and the second gasket 142 are provided with corresponding positioning holes 9, preferably, the positioning holes are arranged at four corners, so that lamination is facilitated, and the arrangement of the heat exchange area main body is not influenced.

The invention also provides a heat exchanger 100 formed by stacking any one of the working fluid channel sheets 1 or prepared by any one of the preparation methods of the heat exchanger. The heat exchanger 100 comprises a plurality of working fluid channel sheets 1, wherein the plurality of working fluid channel sheets 1 are stacked in the O-Z direction, a working fluid channel for working fluid to flow is formed between two adjacent working fluid channel sheets 1, one of the adjacent working fluid channels is only communicated with the first inlet 21 and the first outlet 31, and the other one of the adjacent working fluid channels is only communicated with the second inlet 22 and the second outlet 32.

The shapes and the arrangement of the microstructures 5 on the adjacent working fluid channel sheets 1 are the same as those of the first embodiment. The center points of the microstructures 5 on the adjacent working fluid channel pieces 1 are aligned along the O-XY direction, and the shapes of the microstructures 5 on the adjacent working fluid channel pieces 1 are different, which is not described in detail herein.

It should be noted that: the present invention distinguishes between all the features on the first working fluid channel sheet 11 being "first", and all the features on the second working fluid channel sheet 12 being "second", "first" and "second", and is not limited to the structure and function thereof. For example, the description of the heat transfer zone 4 applies to the first heat transfer zone 41, the second heat transfer zone 42; the description of the structure and distribution of the microstructures 5 and the like also apply to the first microstructure 51 and the second microstructure 52; others are not to be taken as an example.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is merely a detailed description of possible embodiments of the present invention, and it is not intended to limit the scope of the invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. A working fluid passage plate is characterized by comprising

A heat exchange zone;

the heat exchange zone is provided with two groups of inlets and outlets, one group of the inlets and outlets are communicated with the heat exchange zone, and the other group of the inlets and outlets are isolated from the heat exchange zone through a barrier;

and the enclosure frame is arranged around the heat exchange area, the inlet and the outlet.

2. The working fluid channel sheet as claimed in claim 1, wherein: the heat exchange area is provided with a plurality of micro structures, the distance between an inlet and an outlet which are communicated with the heat exchange area and a row of micro structures closest to the heat exchange area is L1, the distance between the inlet and the outlet which are arranged in an isolated way with the heat exchange area and the row of micro structures closest to the inlet and the outlet are L2, and L1 is smaller than L2.

3. The working fluid channel sheet as claimed in claim 2, wherein: an inlet and an outlet which are communicated with the heat exchange area are respectively not more than L1 and not more than the distance between adjacent microstructures in the arrangement direction of the row of microstructures nearest to the inlet and the outlet; and/or the inlet and the outlet which are arranged in a way of being separated from the heat exchange zone are respectively arranged in the arrangement direction of the row of the microstructures closest to the inlet and the outlet, and L2 is larger than the distance between the adjacent microstructures.

4. The working fluid channel sheet as claimed in claim 3, wherein: l2 is 1.5 to 4 times of the distance between two adjacent rows of microstructures.

5. The working fluid channel sheet as claimed in claim 2, wherein: an inlet and an outlet which are communicated with the heat exchange area are respectively arranged on two sides of the heat exchange area along the O-Y direction, the inlet and the outlet which are arranged separately from the heat exchange area are respectively arranged on two sides of the heat exchange area along the O-Y direction, a plurality of microstructures are distributed along a plurality of sine lines extending along the O-X direction, and the sine lines are arranged at intervals along the O-Y direction.

6. The working fluid channel sheet as claimed in claim 5, wherein: l1 is less than or equal to the distance between two adjacent sinusoidal lines; and/or L2 is more than or equal to 1.5-4 times of the distance between two adjacent sine lines.

7. The working fluid channel plate according to any one of claims 1 to 6, wherein: the working fluid channel piece comprises microstructure pieces stacked along the O-Z direction and gaskets of the microstructure pieces, the heat exchange area is arranged on the microstructure pieces, the two groups of inlets and the outlets penetrate through the gaskets of the microstructure pieces along the thickness direction, and the gaskets of the microstructure pieces form the enclosure and the enclosure frame.

8. The working fluid channel sheet as claimed in claim 7, wherein:

the micro-structure sheet comprises the heat exchange area, an inlet through hole corresponding to the inlet, an outlet through hole corresponding to the outlet and a first surrounding frame corresponding to the surrounding frame;

the gasket of the microstructure piece comprises a heat exchange hollowed-out area corresponding to the heat exchange area, an inlet through hole and an outlet through hole which are communicated with the heat exchange area, an inlet hollowed-out area corresponding to the inlet through hole which is arranged in a separated mode with the heat exchange area, an outlet hollowed-out area corresponding to the outlet through hole which is arranged in a separated mode with the heat exchange area, the enclosure and a second enclosure frame corresponding to the enclosure frame.

9. The working fluid channel sheet as claimed in claim 7, wherein: the heat exchange area is provided with a plurality of microstructures, and the microstructures are as thick as the gaskets of the microstructure pieces.

10. A heat exchanger comprising a plurality of the working fluid channel sheets according to any one of claims 1 to 9, wherein the plurality of the working fluid channel sheets are stacked in an O-Z direction, a working fluid channel for passing a working fluid is formed between adjacent two of the working fluid channel sheets, and one of the adjacent working fluid channels communicates with one set of the inlet and the outlet, and the other communicates with only the other set of the inlet and the outlet.