CN112146310A

CN112146310A - Flat tube micro-channel double-liquid heat exchanger and heat exchange method thereof

Info

Publication number: CN112146310A
Application number: CN202011087596.5A
Authority: CN
Inventors: 朱晓国; 周赛军; 刘超桂; 刘伟峰; 赵康; 周高永
Original assignee: Zhejiang Xinjinchen Machinery Co ltd
Current assignee: Zhejiang Xinjinchen Machinery Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2020-12-29

Abstract

The invention relates to a flat tube micro-channel double-liquid heat exchanger and a heat exchange method thereof, belongs to the technical field of micro-channel heat exchangers, and solves the problems that the existing micro-channel heat exchanger is limited in heat exchange efficiency and can only realize cooling and heat exchange on one liquid. According to the invention, two groups of liquid flow channels are formed by connecting flat pipes between two groups of collecting pipes, and two ends of a first flat pipe are respectively communicated with the two collecting pipes of a first group of collecting pipes; two ends of the second flat pipe are respectively communicated with the two collecting pipes of the second group of collecting pipes; two kinds of liquid with different temperatures circulate in the first flat pipe and the second flat pipe respectively, and heat exchange is carried out to complete heat exchange of the two liquids. According to the invention, the micro-channel flat tubes are mutually welded, two refrigerant liquids with different temperatures are respectively circulated between the adjacent flat tubes, and the heat exchange of the two liquids is realized by utilizing the principle of mutual heat transfer between the micro-channel flat tubes.

Description

Flat tube micro-channel double-liquid heat exchanger and heat exchange method thereof

Technical Field

The invention relates to the technical field of micro-channel heat exchangers, in particular to a flat tube micro-channel double-liquid heat exchanger and a heat exchange method thereof.

Background

The micro-channel heat exchanger is used for a condenser wrapped outside the water tank inner container of the air-source heat pump water heater and mainly has the function of transmitting and radiating high-temperature refrigerant conveyed by an air-source heat pump water heater air conditioner external unit to the water tank inner container through the micro-channel heat exchanger so as to heat water in the water tank.

The rapid development of the microelectronics field following Moore's law, and the heat density of high-speed electronic devices has reached 5-10MW/m with the continuous increase of the integration level of transistors²Heat dissipation has become a major "bottleneck" in its development, and microchannel heat exchangers have been a necessary trend to replace traditional heat exchange devices. Therefore, the micro-channel heat exchanger has wide application prospect in the fields of embedded technology, aerospace with high dependence degree of high-performance operation, modern medical treatment, chemical and biological engineering and the like. Compared with the conventional heat exchanger, the micro-channel heat exchanger has the advantages of small volume, large heat exchange coefficient, high heat exchange efficiency, capability of meeting higher energy efficiency standard and excellent pressure resistance.

At present, the existing heat exchanger scheme needs to rely on a wider flat tube to promote the contact area between the outside and the water tank inner container to achieve the energy efficiency, so that the weight of the whole flat tube is heavier and the cost is higher. Or the improvement of reducing is made in the aspect of collecting main external diameter, flat tube width, flat tube thickness, thereby the main objective reduces material weight and improves the price/performance ratio under the condition of guaranteeing the ability efficiency is unchangeable. The conventional micro-channel heat exchanger has limited heat exchange efficiency, can only realize cooling and heat exchange on one liquid, properly changes the structure of the heat exchanger and enhances heat transfer measures of the process, and can effectively enhance the heat transfer of the heat exchanger and improve the energy-saving level of the heat exchanger.

Disclosure of Invention

In view of the foregoing analysis, the present invention aims to provide a flat tube microchannel double-liquid heat exchanger and a heat exchange method thereof, so as to solve the problems that the existing microchannel heat exchanger has limited heat exchange efficiency and can only cool one liquid for heat exchange.

The purpose of the invention is mainly realized by the following technical scheme:

a flat pipe microchannel double liquid heat exchanger, comprising: the two groups of collecting pipes comprise a first flat pipe and a second flat pipe; each group of collecting pipes comprises a left collecting pipe and a right collecting pipe; two ends of the first flat pipe are respectively communicated with the two collecting pipes of the first group of collecting pipes; two ends of the second flat pipe are respectively communicated with the two collecting pipes of the second group of collecting pipes; two liquids with different temperatures circulate in the first flat pipe and the second flat pipe respectively.

Furthermore, the two sides of the first flat pipe are provided with second flat pipes to form flat pipe units, and a plurality of groups of flat pipe units are arranged on the collecting pipe in parallel.

Furthermore, a plurality of first flat tubes and a plurality of second flat tubes are arranged; a plurality of first flat pipes and a plurality of flat pipe interval setting of second.

Further, the header includes: the device comprises a first collecting pipe, a second collecting pipe, a third collecting pipe and a fourth collecting pipe.

Further, the first header, the second header, the third header and the fourth header are arranged in sequence.

Further, the length of the first flat pipe is larger than that of the second flat pipe.

Furthermore, one end of the first flat pipe penetrates through the third collecting pipe to be communicated with the fourth collecting pipe, and the other end of the first flat pipe penetrates through the second collecting pipe to be communicated with the first collecting pipe; one end of the second flat pipe is communicated with the third collecting pipe, and the other end of the second flat pipe is communicated with the second collecting pipe.

Furthermore, one end of the first flat pipe penetrates through the third collecting pipe to be communicated with the fourth collecting pipe, and the other end of the first flat pipe is communicated with the second collecting pipe; one end of the second flat pipe is communicated with the third collecting pipe, and the other end of the second flat pipe penetrates through the second collecting pipe to be communicated with the first collecting pipe.

Further, the first flat pipe and the second flat pipe are fixed through welding or bonding.

The invention discloses a heat exchange method of a flat tube micro-channel double-liquid heat exchanger, which adopts the flat tube micro-channel double-liquid heat exchanger to carry out double-liquid heat exchange and specifically comprises the following steps:

step S1: fixing the first flat pipe and the second flat pipe into a whole;

step S2: the first flat pipe and the second flat pipe are respectively communicated with the two groups of collecting pipes on the two sides;

step S3: a first refrigerant flows through the group of collecting pipes; the other group of the collecting pipes is circulated with a second refrigerant; the first refrigerant and the second refrigerant exchange heat when flowing through the first flat pipe and the second flat pipe.

The invention has the following beneficial effects:

1. double liquid flow heat exchange.

The microchannel heat exchanger is used for a refrigerating system and mainly has the function of realizing the effect of mutual heat exchange between two liquids with different temperatures. The micro-channel flat tubes are welded with each other, two refrigerant liquids with different temperatures are respectively circulated between the adjacent flat tubes, and the heat of the fluid in the micro-channel is exchanged by utilizing the principle of mutual heat transfer between the micro-channel flat tubes.

2. And exchanging heat by a plurality of circulating channels.

According to the flat tube micro-channel double-liquid heat exchanger, the plurality of first flat tubes and the plurality of second flat tubes are connected between the collecting pipes on the two sides and are respectively used for circulating refrigerant liquid with different temperatures for heat exchange, the plurality of flat tubes and the collecting pipes on the two sides form the plurality of circulating channels, and the plurality of layers of flat tubes exchange heat, so that the heat exchange efficiency is improved.

3. The integration level is high, and the suitability is good.

The micro-channel double-liquid heat exchanger disclosed by the invention is simple in structure, high in integration level and small in occupied space, realizes cross communication by overlapping the flat pipes and setting different lengths of the flat pipes to form double-liquid circulation channels, can change the shape according to the installation space requirement of an actual working condition, and has better applicability.

In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

FIG. 1 is a microchannel dual liquid heat exchanger of the present invention;

FIG. 2 is a top view of a flat tube microchannel dual liquid heat exchanger of the present invention;

FIG. 3 is a sectional view of a flat tube micro-channel double-liquid heat exchanger with flat tube horizontal rows from the A-A direction;

FIG. 4 is a flat tube micro-channel double liquid heat exchanger with longitudinal rows of flat tubes;

FIG. 5 is a sectional view of a flat tube micro-channel double liquid heat exchanger A-A with longitudinal flat tube rows;

FIG. 6 is a schematic view of a flat tube structure;

FIG. 7 is a sectional view of the heat exchanger in the direction B-B when the flat tubes are longitudinally arranged;

FIG. 8 is a C-C sectional view of the heat exchanger in the longitudinal row of the flat tubes.

Reference numerals:

1-a first header; 2-a second header; 3-a third header; 4-a fourth header; 5-a first flat tube; 6-second flat tube.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.

Example 1

The invention discloses a flat tube micro-channel double-liquid heat exchanger with flat tube horizontal rows, as shown in fig. 1-3, comprising: the device comprises a first collecting pipe 1, a second collecting pipe 2, a third collecting pipe 3, a fourth collecting pipe 4, a first flat pipe 5 and a second flat pipe 6; two ends of the first flat pipe 5 are respectively communicated with the first collecting pipe 1 and the fourth collecting pipe 4, and two ends of the second flat pipe 6 are respectively communicated with the second collecting pipe 2 and the third collecting pipe 3; the first collecting pipe 1, the first flat pipe 5 and the fourth collecting pipe 4 form a circulation passage for circulating a first refrigerant; the second collecting pipe 2, the second flat pipe 6 and the third collecting pipe 3 form a circulation passage for circulating a second refrigerant. There is a temperature difference between the first refrigerant and the second refrigerant.

Specifically, first flat pipe 5 is close to second flat pipe 6, and first flat pipe 5 and second flat pipe 6 can carry out the heat exchange with the mode of heat radiation or heat transfer.

Further, the first header 1, the second header 2, the third header 3 and the fourth header 4 are sequentially arranged and located on the same plane/curved surface.

Further, under the vertical condition of placing of pressure manifold, set up the mounting means of flat pipe: fig. 3 is a cross-sectional view of the heat exchanger of fig. 1 in the direction a-a. As shown in fig. 3, a first flat tube 5 and two second flat tubes 6 form a flat tube unit, and the second flat tubes 6 are disposed on two sides of the first flat tube 5 in the horizontal direction.

Or, one flat tube unit may also be composed of one second flat tube 6 and two first flat tubes 5, the first flat tubes 5 and the second flat tubes 6 are arranged at intervals, that is, the two first flat tubes 5 are arranged at two sides of the second flat tube 6, and the three flat tubes are arranged horizontally on the collecting main, as shown in fig. 3, the width direction of the flat tubes is parallel to the length direction of the collecting main; the side faces of the three flat pipes are attached to each other, and the three flat pipes of the flat pipe units are located on the same horizontal plane.

Further, the first flat pipe 5 and the second flat pipe 6 are fixed as an integral flat pipe unit by welding or bonding.

Further, set up a plurality of flat tube unit between the pressure manifold of both sides, and a plurality of flat tube unit set up side by side in vertical direction, and the three flat tube of a flat tube unit sets up side by side in the horizontal direction, and the width direction of first flat tube 5 and the flat tube 6 of second is on a parallel with the length direction of pressure manifold promptly.

Further, the first flat tube 5 and the second flat tube 6 are each an elongated flat tube body having upper and lower flat surface portions, as shown in fig. 6.

Furthermore, the collecting pipes on the two sides and the flat pipe unit in the middle form a heat exchanger plane; a flat tube unit has three flat pipes, and the first flat pipe 5, and the flat plane portion (width direction) of two flat tubes of second 6 all are on a parallel with the heat exchanger plane (vertical plane), the equal vertical setting of the flat pipe of first flat pipe 5 and second 6 promptly.

Or, the first flat pipe 5 of the flat pipe unit and the plane parts (width direction) of the two flat pipes 6 of the second are all perpendicular to the plane (vertical plane) of the heat exchanger, that is, the first flat pipe 5 and the flat pipes 6 of the second are all horizontally arranged.

In the double-liquid heat exchanger of the embodiment, an overlapping brazing mode of 3 or more micro-channel flat pipes is adopted, so that the double-liquid heat exchanger becomes an integral flat pipe unit, and the lengths of the flat pipes between the odd-numbered layers and the even-numbered layers are different; namely, the first flat tubes 5 and the second flat tubes 6 are arranged in a staggered manner and have different lengths.

Further, the length of the first flat tube 5 is larger than that of the second flat tube 6.

Further, one end of the first flat pipe 5 penetrates through the second collecting pipe 2 to be communicated with the first collecting pipe 1, and the other end of the first flat pipe 5 penetrates through the third collecting pipe 3 to be communicated with the fourth collecting pipe 4.

Example 2

The invention discloses a flat tube micro-channel double-liquid heat exchanger with longitudinal flat tube rows, which comprises: the device comprises a first collecting pipe 1, a second collecting pipe 2, a third collecting pipe 3, a fourth collecting pipe 4, a first flat pipe 5 and a second flat pipe 6; the two ends of the first flat tube 5 are respectively communicated with the first collecting pipe 1 and the fourth collecting pipe 4, and the first collecting pipe 1, the first flat tube 5 and the fourth collecting pipe 4 form a liquid circulation passage for circulating a first refrigerant; the two ends of the second flat pipe 6 are respectively communicated with the second collecting pipe 2 and the third collecting pipe 3, and the second collecting pipe 2, the second flat pipe 6 and the third collecting pipe 3 form a circulation passage for circulating a second refrigerant. There is a temperature difference between the first refrigerant and the second refrigerant.

Specifically, as shown in fig. 6, the flat tube: the micro-channel flat tube is a flat tube, a plurality of micro channels are arranged in the flat tube, the equivalent diameter of the channels is 10-1000 mu m, and the specification of the flat tube is generally expressed as width x thickness.

Specifically, a plurality of first flat pipes 5 and second flat pipes 6 are arranged in parallel in the vertical direction, and the first flat pipes 5 and the second flat pipes 6 are arranged at intervals. That is, adjacent to the first flat tube 5 is a second flat tube 6, as shown in fig. 4, 7, and 8.

Further, the width direction of the first flat tube 5 and the second flat tube 6 is perpendicular to the length direction of the header, as shown in fig. 7 and 8.

As shown in fig. 4, the first flat tube 5 is adjacent to the second flat tube 6, and the first flat tube 5 and the second flat tube 6 can exchange heat in a thermal radiation manner.

Further, the first collecting pipe 1, the second collecting pipe 2, the third collecting pipe 3 and the fourth collecting pipe 4 are located on the same plane and are sequentially arranged in parallel.

Specifically, fig. 4 is a schematic structural view of the heat exchanger according to the present invention when a plurality of flat tubes are vertically arranged side by side, and fig. 5 is a sectional view of the heat exchanger according to the present invention when the flat tubes are vertically arranged side by side in the direction of a collecting main a-a. As shown in fig. 4 and 5, one end of the first flat pipe 5 passes through the second collecting pipe 2 to communicate with the first collecting pipe 1, and the other end of the first flat pipe 5 passes through the third collecting pipe 3 to communicate with the fourth collecting pipe 4.

Fig. 7 is a sectional view taken in the direction B-B, that is, a longitudinal sectional view of the fourth header 4; fig. 8 is a sectional view in the direction C-C, that is, a longitudinal sectional view of the third header 3. As shown in fig. 7 and 8, one end (right end) of the first flat tube 5 passes through the third header 3 and communicates with the fourth header 4, but the first flat tube 5 does not communicate with the third header 3. One end (right end) of the second flat pipe 6 is communicated with the third collecting pipe 3.

Similarly, the other end (left end) of the first flat tube 5 passes through the second collecting pipe 2 to communicate with the first collecting pipe 1, but the first flat tube 5 does not communicate with the second collecting pipe 2. The other end (left end) of the second flat pipe 6 is communicated with the second collecting pipe 2.

Further, a plurality of first flat pipes 5 and second flat pipes 6 are longitudinally arranged (in the vertical direction) on the collecting pipe, and the side surfaces (plane portions) of the first flat pipes 5 and the second flat pipes 6 are attached to each other, as shown in fig. 4. The plane portion (width direction) of flat pipe all is perpendicular to heat exchanger plane (vertical plane), first flat pipe 5 promptly and the equal level setting of second flat pipe 6.

When in implementation:

a first refrigerant circulates in the first collecting pipe 1, the first flat pipe 5 and the fourth collecting pipe 4; a second refrigerant flows through the second collecting pipe 2, the second flat pipe 6 and the third collecting pipe 3;

specifically, a first refrigerant flows into the heat exchanger from the first collecting pipe 1, flows through the first flat pipe 5, and finally flows out of the heat exchanger from the fourth collecting pipe 4; the flow sequentially passes through the first collecting pipe 1, the first flat pipe 5 and the fourth collecting pipe 4 (or flows reversely).

The second refrigerant flows into the heat exchanger from the second collecting pipe, flows through the second flat pipe 6, finally flows out of the heat exchanger from the third collecting pipe 3, and sequentially flows through the second collecting pipe 2, the second flat pipe 6 and the third collecting pipe 3 (or reversely flows).

The first refrigerant and the second refrigerant have a temperature difference, and heat exchange is performed in a heat radiation manner when the first refrigerant and the second refrigerant respectively flow through the first flat tube 5 or the second flat tube 6.

Further, the plurality of first flat tubes 5 and the plurality of second flat tubes 6 are fixed integrally by welding or bonding.

Further, through increasing the quantity of pressure manifold and the length kind of flat pipe, can realize carrying out the heat transfer to the refrigerant liquid more than three kinds. Illustratively, in a specific implementation mode, the number of the collecting pipes is six, the collecting pipes are divided into three groups of collecting pipes on the left side and the right side, the flat pipes are divided into three groups, the first group of flat pipes are communicated with the first group of collecting pipes, the two ends of the second group of flat pipes are communicated with the second group of collecting pipes, and the third group of flat pipes are communicated with the third group of collecting pipes. The heat exchange of various different liquids can be realized.

Example 3

In this embodiment, the flat tube microchannel dual-liquid heat exchanger in

embodiments

1 and 2 is improved, in which one end (left end) of a first flat tube 5 passes through a second collecting pipe 2 to be communicated with the first collecting pipe 1, and the other end (right end) is directly communicated with a third collecting pipe 3; meanwhile, one end (left end) of the second flat pipe 6 is directly communicated with the second collecting pipe 2, and the other end (right end) of the second flat pipe 6 penetrates through the third collecting pipe 3 to be communicated with the fourth collecting pipe 4. That is, the first collecting pipe 1, the first flat pipe 5 and the third collecting pipe 3 are communicated; the second collecting pipe 2, the second flat pipe 6 and the fourth collecting pipe 4 are communicated.

Or the first collecting pipe 1, the second flat pipe 6 and the third collecting pipe 3 are communicated; meanwhile, the second collecting pipe 2, the first flat pipe 5 and the fourth collecting pipe 4 are communicated.

Adopt above-mentioned mounting means, through the mode with first flat pipe 5 and the dislocation of second flat pipe 6 in the horizontal direction, can eliminate the requirement to flat pipe length, the length of first flat pipe 5 and the flat pipe 6 of second is equal or inequality.

Example 4

The embodiment provides a heat exchange method, which adopts the flat tube micro-channel double-liquid heat exchanger in embodiment 1, embodiment 2 or embodiment 3 to exchange heat, and specifically comprises the following steps:

step S1: fixing the first flat pipe 5 and the second flat pipe 6 into a whole;

step S2: the first flat pipe 5 and the second flat pipe 6 are respectively communicated with the two groups of collecting pipes on the two sides;

step S3: a first refrigerant flows through the group of collecting pipes; the other group of the collecting pipes is circulated with a second refrigerant; the first refrigerant and the second refrigerant exchange heat when flowing through the first flat tube 5 and the second flat tube 6. That is to say, form two sets of runners through two sets of microchannel flat tubes, can circulate the liquid of different temperatures between 2 groups of runners, and two kinds of liquid carry out the heat transfer through two sets of microchannel flat tubes that weld together again each other.

In step S1, the connection modes between the flat tubes are two:

the first method comprises the following steps: two sides of the first flat pipe 5 are welded/bonded with the second flat pipe 6 to form a flat pipe unit;

and the second method comprises the following steps: a plurality of first flat pipes 5 and a plurality of flat pipe 6 interval settings of second, and through bonding or welded fastening to flat pipe combination.

In step S2, there are two mounting manners between the flat pipe and the header pipe:

the first method comprises the following steps: two ends of the first flat pipe 5 respectively penetrate through the second collecting pipe 2 and the third collecting pipe 3 to be communicated with the first collecting pipe 1 and the fourth collecting pipe 4; the second flat pipe 6 is communicated with the second collecting pipe 2 and the third collecting pipe 3.

And the second method comprises the following steps: one end of the first flat pipe 5 passes through the second collecting pipe 2 to be communicated with the first collecting pipe 1, and the other end is communicated with the third collecting pipe 3; one end of the second flat pipe 6 is communicated with the second collecting pipe 2, and the other end of the second flat pipe passes through the third collecting pipe 3 and is communicated with the fourth collecting pipe 4.

The mounting manner between the first flat tube 5 and the second flat tube 6 is the manner in embodiments 1 to 3, that is, the combination manner between the flat tubes in step S1, and the mounting manner between the flat tubes and the header tubes in step S2 are arranged and combined, so that at least three types of radiator structures can be obtained, specifically:

the first method comprises the following steps: as shown in fig. 3, the second flat tubes 6 are welded to both sides of the first flat tube 5 to form a flat tube unit; two ends of a first flat pipe 5 of the flat pipe unit respectively penetrate through a second collecting pipe 2 and a third collecting pipe 3 to be communicated with a first collecting pipe 1 and a fourth collecting pipe 4 to form a circulation channel for circulating a first refrigerant (a liquid); the second flat pipe 6 is communicated with the second collecting pipe 2 and the third collecting pipe 3 to form a circulation channel for circulating a second refrigerant; the collecting pipes on two sides of which the flat pipe units are connected in parallel form the horizontally-arranged flat pipe micro-channel double-liquid heat exchanger in embodiment 1.

And the second method comprises the following steps: the plurality of first flat tubes 5 and the plurality of second flat tubes 6 are distributed in a staggered manner (distributed at intervals) and are welded/bonded and fixed; the flat pipes are vertically arranged, and two ends of a first flat pipe 5 respectively penetrate through a second collecting pipe 2 and a third collecting pipe 3 to be communicated with a first collecting pipe 1 and a fourth collecting pipe 4 to form a circulation channel for circulating a first refrigerant (a liquid); the second flat pipe 6 is communicated with the second collecting pipe 2 and the third collecting pipe 3 to form a circulation channel for circulating a second refrigerant; the vertically arranged flat tube micro-channel double liquid heat exchanger in the embodiment 2 is formed.

And the third is that: the plurality of first flat tubes 5 and the plurality of second flat tubes 6 are distributed in a staggered manner (distributed at intervals) and are welded/bonded and fixed; the flat pipes are vertically arranged, one end of a first flat pipe 5 penetrates through the second collecting pipe 2 to be communicated with the first collecting pipe 1, and the other end of the first flat pipe is communicated with the third collecting pipe 3; one end of the second flat pipe 6 is communicated with the second collecting pipe 2, and the other end of the second flat pipe passes through the third collecting pipe 3 and is communicated with the fourth collecting pipe 4.

In step S3, a temperature difference exists between the first refrigerant and the second refrigerant, the two refrigerants circulate in the first flat tube 5 and the second flat tube 6 respectively, heat exchange is performed by means of thermal radiation or heat exchange, the temperature of the high-temperature refrigerant flowing through the flat tubes is reduced, and the temperature of the low-temperature refrigerant flowing through the flat tubes is increased.

Illustratively, the first refrigerant is a high temperature refrigerant and the second refrigerant is a low temperature refrigerant. The high-temperature refrigerant flows into the heat exchanger from the fourth collecting pipe 4, flows into the first collecting pipe 1 through a plurality of rows of middle first flat pipes 5, and finally flows out of the heat exchanger from the first collecting pipe 1; the low-temperature refrigerant flows into the heat exchanger through the third collecting pipe 3 and flows into the second collecting pipe 2 through a plurality of rows of second flat pipes 6 in the middle, and the high-temperature refrigerant in the first flat pipe 5 transfers heat to the low-temperature refrigerant in the second flat pipes 6; the temperature of the high-temperature refrigerant is reduced after flowing through the first flat pipe 5, and the temperature of the low-temperature refrigerant is increased after flowing through the second flat pipe 6, so that the heat exchange of two refrigerant liquids is completed.

It should be noted that "high temperature" and "low temperature" in the present invention are relative concepts, and are used to refer to the side with higher or lower relative temperature in two refrigerants.

Compared with the prior art, the micro-channel double-liquid heat exchanger provided by the invention has at least one of the following beneficial effects:

1. the microchannel heat exchanger is used for a refrigerating system and mainly has the function of realizing the effect of mutual heat exchange between two liquids. The micro-channel flat tubes are welded with each other, two refrigerant liquids with different temperatures are respectively circulated between the adjacent flat tubes, and the heat of the fluid in the micro-channel is exchanged by utilizing the principle of mutual heat transfer between the micro-channel flat tubes.

2. The existing plate-type radiator with laminated sheets has limited application scenes, and can be used only by a large enough installation space, so that the requirement on the installation space is high. The plate heat exchanger has a single structure, and the structure of the plate heat exchanger cannot be changed under a specific structure; compared with a plate type heat exchanger, the flat tube micro-channel double-liquid heat exchanger disclosed by the invention is simple in structure, the flat tubes are arranged in an overlapping manner and are different in length, so that cross communication is realized to form double-liquid circulation channels, the integration level is high, the occupied space is small, the shape change can be carried out according to the installation space requirement of the actual working condition, and the double-liquid circulation heat exchanger has better applicability.

3. According to the double-liquid heat exchanger disclosed by the invention, through increasing the number of the collecting pipes and the length types of the flat pipes, heat exchange of three or more refrigerants can be realized, so that the double-liquid heat exchanger is suitable for different application scenes, and more heat exchange function combinations can be derived from the micro-channel heat exchanger.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. The utility model provides a two liquid heat exchangers of flat pipe microchannel which characterized in that includes: two groups of collecting pipes, a first flat pipe (5) and a second flat pipe (6); each group of collecting pipes comprises a left collecting pipe and a right collecting pipe; two ends of the first flat pipe (5) are respectively communicated with two collecting pipes of the first group of collecting pipes; two ends of the second flat pipe (6) are respectively communicated with two collecting pipes of a second group of collecting pipes; two liquids with different temperatures circulate in the first flat pipe (5) and the second flat pipe (6) respectively.

2. The flat tube micro-channel double-liquid heat exchanger as claimed in claim 1, wherein the two sides of the first flat tube (5) are provided with second flat tubes (6) to form flat tube units, and a plurality of groups of the flat tube units are arranged on the collecting main in parallel.

3. The flat tube microchannel dual liquid heat exchanger according to claim 1, wherein the first flat tube (5) and the second flat tube (6) are provided in plurality; a plurality of first flat pipe (5) and a plurality of second flat pipe (6) interval sets up.

4. The flat tube microchannel dual liquid heat exchanger of claim 2 or 3, wherein the header comprises: the device comprises a first collecting pipe (1), a second collecting pipe (2), a third collecting pipe (3) and a fourth collecting pipe (4).

5. The flat tube microchannel double liquid heat exchanger according to claim 4, wherein the first header (1), the second header (2), the third header (3) and the fourth header (4) are arranged in sequence.

6. Flat tube microchannel dual liquid heat exchanger according to claim 4 or 5, characterized in that the length of the first flat tube (5) is greater than the length of the second flat tube (6).

7. The flat tube micro-channel double-liquid heat exchanger as claimed in claim 6, wherein one end of the first flat tube (5) passes through a third collecting pipe (3) to be communicated with a fourth collecting pipe (4), and the other end passes through the second collecting pipe (2) to be communicated with the first collecting pipe (1); one end of the second flat pipe (6) is communicated with the third collecting pipe (3), and the other end of the second flat pipe is communicated with the second collecting pipe (2).

8. The flat tube microchannel double liquid heat exchanger according to claim 4 or 5, wherein one end of the first flat tube (5) passes through the third collecting pipe (3) to communicate with the fourth collecting pipe (4), and the other end communicates with the second collecting pipe (2); one end of the second flat pipe (6) is communicated with the third collecting pipe (3), and the other end of the second flat pipe penetrates through the second collecting pipe (2) to be communicated with the first collecting pipe (1).

9. The flat tube microchannel double liquid heat exchanger according to claim 2 or 3, wherein the first flat tube (5) and the second flat tube (6) are fixed by welding or bonding.

10. A heat exchange method of a flat tube microchannel double-liquid heat exchanger, which is characterized in that the flat tube microchannel double-liquid heat exchanger of claims 1 to 9 is adopted for double-liquid heat exchange, and comprises the following steps:

step S1: fixing the first flat pipe (5) and the second flat pipe (6) into a whole;

step S2: the first flat pipe (5) and the second flat pipe (6) are respectively communicated with the two groups of collecting pipes on the two sides;

step S3: a first refrigerant flows through the group of collecting pipes; the other group of the collecting pipes is circulated with a second refrigerant; the first refrigerant and the second refrigerant exchange heat when flowing through the first flat pipe (5) and the second flat pipe (6).