CN112146467A - Microchannel heat exchanger and air conditioner - Google Patents

Abstract

The present application provides a microchannel heat exchanger and an air conditioner. The microchannel heat exchanger comprises a flat heat exchange tube (1), an adapter (2), a first header (3) and a second header (4), and the first header (3) is arranged on the The first end of the flat heat exchange tube (1), the second header (4) is arranged at the second end of the flat heat exchange tube (1), and the adapter (2) is along the width of the flat heat exchange tube (1) extending in the direction of extension, wherein the adapter (2) is arranged on the first end of the flat heat exchange tube (1), and the first end of the flat heat exchange tube (1) is connected to the first header through the adapter (2) (3); and/or, the adapter (2) is arranged on the second end of the flat heat exchange tube (1), and the second end of the flat heat exchange tube (1) is connected to the second end of the flat heat exchange tube (1) through the adapter (2). on the second header (4). According to the microchannel heat exchanger of the present application, the flow distribution of the refrigerant can be made more uniform, and the heat exchange efficiency of the heat exchanger can be improved.

Description

Microchannel heat exchangers and air conditioners

technical field

The present application relates to the technical field of air conditioning, in particular to a microchannel heat exchanger and an air conditioner.

Background technique

In the prior art, a microchannel heat exchanger consists of several flat tubes, fins connected between the flat tubes, and two headers connected to both ends of the flat tubes. Due to its high heat exchange efficiency, compact structure, and cost advantages over ordinary copper tube fin heat exchangers, microchannel flow heat exchangers have been widely used in household and commercial air conditioners as single-cooler condensers.

However, the diameter of the inner collecting hole of the traditional micro-channel heat exchanger must be larger than the width of the flat tube to complete the assembly, which leads to a large space inside the header, which will reduce the flow rate of the refrigerant in the header, and cause the heat exchanger to be used as an evaporator. The refrigerant gas and liquid are stratified, and the liquid distribution is uneven when entering the flat tube, which reduces the performance of the heat exchanger and increases the refrigerant charge.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present application is to provide a micro-channel heat exchanger and an air conditioner, which can make the liquid separation of the refrigerant entering the flat tube more uniform, improve the performance of the heat exchanger, and at the same time reduce the refrigerant charge.

In order to solve the above problems, the present application provides a micro-channel heat exchanger, which includes a flat heat exchange tube, an adapter, a first header and a second header, and the first header is arranged at the end of the flat heat exchange tube The first end and the second header are arranged at the second end of the flat heat exchange tube, and the adapter extends along the width direction of the flat heat exchange tube, wherein,

The adapter is arranged on the first end of the flat heat exchange tube, and the first end of the flat heat exchange tube is connected to the first header through the adapter;

And/or, the adapter is arranged on the second end of the flat heat exchange tube, and the second end of the flat heat exchange tube is connected to the second header through the adapter.

Preferably, the adapter is provided with a flat tube groove extending in the length direction, the flat heat exchange tube is installed in the flat tube groove, and the nozzle of the adapter located at the first end of the flat heat exchange tube is connected to the first header The tube, and/or the nozzle of the adapter at the second end of the flat heat exchange tube is connected to the second header.

Preferably, the orifice of the adapter remote from the header is sealed by a stopper.

Preferably, the first header is a liquid tube, the adapter is connected between the first end of the flat heat exchange tube and the liquid tube, and the diameter of the liquid tube is smaller than the width of the flat heat exchange tube.

Preferably, the length of the adaptor extending into the liquid pipe is half the radius of the inner hole of the liquid pipe.

Preferably, the adapter located at the first end of the flat heat exchange tube is connected to the flat heat exchange tube in a one-to-one correspondence.

Preferably, the liquid pipe forms at least two spaced cavities along the axial direction, and each cavity is correspondingly connected with an adapter.

Preferably, at least one partition groove is provided on the liquid pipe, and a partition plate is installed in the partition groove, and the partition plate is configured to divide the liquid pipe into at least two cavities in the axial direction.

Preferably, the liquid pipe includes at least two sections spaced apart in the axial direction, at least one section forms a constriction structure along the direction from top to bottom at the bottom position, and each section forms an independent cavity.

According to another aspect of the present application, an air conditioner is provided, comprising a microchannel heat exchanger, and the microchannel heat exchanger is the above-mentioned microchannel heat exchanger.

Preferably, the air conditioner further comprises a compressor, a four-way valve, a throttling device and a first heat exchanger, the compressor, the first heat exchanger, the throttling device and the micro-channel heat exchanger are connected in sequence, and the four-way valve is installed in the Compressor discharge port.

Preferably, the air conditioner further includes a shunt, the first header of the micro-channel heat exchanger is a liquid pipe, the first header forms at least two cavities arranged at intervals along the axial direction, and the shunt port of the shunt is connected to the cavity One-to-one correspondence connection.

The microchannel heat exchanger provided in this application includes a flat heat exchange tube, an adapter, a first header and a second header, and the first header is arranged on the first header of the flat heat exchange tube. At one end, the second header is arranged at the second end of the flat heat exchange tube, and the adapter extends along the width direction of the flat heat exchange tube, wherein the adapter is arranged at the first end of the flat heat exchange tube, and the heat exchange The first end of the flat tube is connected to the first header through an adapter; and/or, the adapter is arranged on the second end of the flat heat exchange tube, and the second end of the flat heat exchange tube is connected through the adapter on the second header. In this application, an adapter is used to realize the connection between the header and the flat heat exchange tube, and the extension direction of the adapter is consistent with the width direction of the flat heat exchange tube, so that the wide side of the flat heat exchange tube can correspond to the width of the flat heat exchange tube. The length direction of the heat exchange tube is set, so that as long as the length of the adapter can be greater than the width of the heat exchange flat tube, and the diameter of the internal flow hole is larger than the thickness of the heat exchange flat tube, it can meet the connection requirements of the heat exchange flat tube. The thickness of the flat tube is much smaller than the width of the heat exchange flat tube, so the cross-sectional area of the adapter can be greatly reduced, thereby reducing the pipe diameter of the header matched with the adapter, so that the inner diameter of the header can be smaller than The width of the heat exchange flat tube can increase the refrigerant flow rate in the header by reducing the inner diameter of the header. When the microchannel heat exchanger is used as an evaporator and the header is a liquid tube, it can effectively slow down the flow rate of the refrigerant in the header. The gas-liquid stratification of the refrigerant makes the liquid distribution of the refrigerant entering the heat exchange flat tubes more uniform and improves the performance of the heat exchanger. The refrigerant charge can be reduced.

Description of drawings

1 is a schematic three-dimensional structure diagram of a microchannel heat exchanger according to an embodiment of the application;

FIG. 2 is a structural diagram of the cooperation between an adapter and a first header of a microchannel heat exchanger according to an embodiment of the application;

FIG. 3 is a cross-sectional view of the mating structure of an adapter and a first header of a microchannel heat exchanger according to an embodiment of the application;

4 is a schematic diagram of a refrigerant flow structure of a microchannel heat exchanger according to an embodiment of the application;

5 is a three-dimensional structural view of a microchannel heat exchanger according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of an air conditioner according to an embodiment of the present application.

Reference numerals are indicated as:

1. Heat exchange flat tube; 2. Adapter; 3. First header; 4. Second header; 5. Flat tube slot; 6. Blocking piece; 7. Partition slot; 8. Spacer 9. Narrowing structure; 10. Compressor; 11. Four-way valve; 12. Throttle device; 13. First heat exchanger; 14. Diverter.

Detailed ways

1 to 6 , according to an embodiment of the present application, the microchannel heat exchanger includes a flat heat exchange tube 1 , an adapter 2 , a first header 3 and a second header 4 . The first header The header 3 is arranged at the first end of the flat heat exchange tube 1 , the second header 4 is arranged at the second end of the flat heat exchange tube 1 , and the adapter 2 extends along the width direction of the flat heat exchange tube 1 , wherein , the adapter 2 is arranged on the first end of the flat heat exchange tube 1, and the first end of the flat heat exchange tube 1 is connected to the first header 3 through the adapter 2; and/or the adapter 2 is provided At the second end of the flat heat exchange tube 1 , the second end of the flat heat exchange tube 1 is connected to the second header 4 through the adapter 2 .

In this application, the adapter 2 is used to realize the connection between the header and the flat heat exchange tube 1 , and the extension direction of the adapter 2 is consistent with the width direction of the flat heat exchange tube 1 , so that the width of the flat heat exchange tube 1 can be increased. The sides are arranged corresponding to the length direction of the adapter 2, so that as long as the length of the adapter 2 can be larger than the width of the heat exchange flat tube 1, and the diameter of the internal circulation hole is larger than the thickness of the heat exchange flat tube 1, the heat exchange flat tube can be satisfied. Since the thickness of the flat heat exchange tube 1 is much smaller than the width of the flat heat exchange tube 1, the cross-sectional area of the adapter 2 can be greatly reduced, thereby reducing the amount of integration required for the adapter 2. The diameter of the flow pipe can make the inner diameter of the header can be smaller than the width of the heat exchange flat tube 1, so that the refrigerant flow rate in the header can be increased by reducing the inner diameter of the header, and it can be used as an evaporator in the microchannel heat exchanger. And when the header is a liquid pipe, the gas-liquid stratification of the refrigerant in the header can be effectively slowed down, so that the refrigerant liquid entering into the flat heat exchange tube 1 is more uniform, and the performance of the heat exchanger is improved. , the refrigerant in the header can be quickly and evenly distributed to the heat exchange flat tubes 1, so the refrigerant charge can also be reduced.

The adapter 2 is provided with a flat tube slot 5 extending along the length direction, the heat exchange flat tube 1 is installed in the flat tube slot 5, and the nozzle of the adapter 2 located at the first end of the heat exchange flat tube 1 is connected to the first end of the heat exchange flat tube 1. A header 3 , and/or the nozzle of the adapter 2 at the second end of the flat heat exchange tube 1 is connected to the second header 4 .

The adapter 2 is, for example, a round tube structure. A flat tube groove 5 is formed on the peripheral wall of the round tube structure along the circumferential direction. The end of the heat exchange flat tube 1 is installed on the flat tube groove 5. On the tube wall of the header, the flat heat exchange tubes 1 can be communicated with the header through a round tube structure. Since the diameter of the inner hole of the circular tube structure only needs to be larger than the thickness of the flat heat exchange tube 1, the effective connection with the flat heat exchange tube 1 can be realized, and the diameter of the inner hole of the header only needs to be larger than or equal to the inner hole of the circular tube structure. Therefore, the diameter of the header can be greatly reduced, so that the diameter of the inner hole of the header can be smaller than the width of the heat exchange flat tube 1, and it can also meet the requirements of the exchange The connection of the hot flat tube 1 is required.

The adapter 2 adopts a round tube structure with a simple structure, which is convenient to realize the connection with the heat exchange flat tube 1, and also facilitate the connection with the collector tube, and the material selection and processing are easy to realize.

The orifice of the adapter 2 away from the header is sealed by a stopper 6 . The blocking member 6 is, for example, an end cap or a plug, which can block the nozzle at the end of the adapter 2 away from the header, so that the end nozzle of the adapter 2 forms a sealing structure to prevent refrigerant leakage. In other embodiments, the adapter 2 can also be directly processed into a tubular structure with one end closed and one end open.

In one embodiment, the first header 3 is a liquid tube, the adapter 2 is connected between the first end of the flat heat exchange tube 1 and the liquid tube, and the diameter of the liquid tube is smaller than the width of the flat heat exchange tube 1 . In this embodiment, since the first header 3 is a liquid pipe, and for the liquid pipe, when the diameter of the inner hole is larger, it is more likely to cause gas-liquid stratification, so the above-mentioned adapter 2 is especially suitable for The connection between the liquid tube and the flat heat exchange tube 1 can effectively reduce the diameter of the liquid tube without affecting the connection between the flat heat exchange tube 1 and the liquid tube.

Since the adapter 2 is added in this application, and the structure of the adapter 2 can be selected according to the structural dimensions of the heat exchange flat tube 1 and the liquid pipe, the structure of the heat exchange flat tube 1 and the liquid pipe does not need to be changed, A relatively regular structure can be adopted, and the processing cost and processing difficulty can be effectively controlled. At the same time, since the adapter 2 itself only needs to be able to realize the connection between the heat exchange flat tube 1 and the liquid pipe, the adapter 2 needs to satisfy only that the diameter of the inner hole is larger than the thickness of the heat exchange flat tube 1, and less than or equal to the thickness of the heat exchange flat tube 1. It is equal to the inner hole diameter of the liquid pipe, and the length of the adapter 2 is greater than the length of the heat exchange flat tube 1. In this way, since there is no special requirement for the structure of the adapter 2, the adapter 2 can also use a straight pipe The structure, the processing difficulty is low, and it is easy to realize.

The length of the adapter 2 extending into the liquid pipe is half the radius of the inner hole of the liquid pipe, which can ensure that the adapter 2 is completely inserted into the inner cavity of the liquid pipe and facilitate the flow of the refrigerant.

In order to facilitate the installation and cooperation of the adapter 2 and the liquid pipe, when the adapter 2 is a round pipe structure, the outer diameter of the adapter 2 is smaller than the inner hole diameter of the liquid pipe.

The adapter 2 located at the first end of the flat heat exchange tube 1 is connected to the flat heat exchange tube 1 in a one-to-one correspondence. In one embodiment, each adapter 2 is an independent individual, each adapter 2 is a circular tube structure, and the adapters 2 are spaced apart from each other and are not connected to each other. Fewer structural requirements and easier processing.

In other embodiments, a plurality of adapters 2 can also be connected together to form an integral structure. For example, the adapters 2 can be grouped two by two and divided into multiple groups, each group of adapters 2 fixed together. The adapter 2 can also adopt other structural forms to realize the connection between the heat exchange flat tube 1 and the liquid tube.

The liquid pipe forms at least two spaced cavities along the axial direction, and each cavity is correspondingly connected with an adapter 2 . By dividing the liquid pipe into at least two spaced cavities in the circumferential direction, and making each cavity have a branch pipe connected to the refrigerant pipeline, in the process of refrigerant flow, when the microchannel heat exchanger is used as an evaporator At the same time, the refrigerant can directly flow into each cavity through each branch pipe at the same time, so that the flow of the refrigerant in the liquid pipe is shortened and the flow rate is increased, which can more effectively improve the uniformity of the distribution of the refrigerant and improve the heat exchange performance of the heat exchanger. The pipe wall of the liquid pipe is provided with an interface, and the branch pipe is connected to the interface.

In one embodiment, at least one partition groove 7 is provided on the liquid pipe, and a partition 8 is installed in the partition groove 7, and the partition 8 is configured to divide the liquid pipe into at least two cavities in the axial direction. In this embodiment, the liquid pipe is still an integral structure, but a partition groove 7 for installing the spacer 8 is opened on the pipe wall of the liquid pipe. When the spacer 8 is installed in the liquid pipe through the partition groove 7, it can The inner cavity of the liquid tube is divided so that the liquid tube forms a plurality of spaced cavities. For example, the liquid pipe is divided into M cavities by the partition groove 7, wherein M≥1, each cavity is correspondingly provided with N connection grooves, N≥1, the adapter 2 is connected in the connection groove, and the heat exchange flat tube 1 is assembled with the flat tube slot 5 on the adapter 2.

The axial length of each cavity may be the same or different, and the number of adapters 2 corresponding to each cavity may be the same or different.

In one embodiment, the liquid pipe includes at least two sections spaced apart in the axial direction, at least one section forms a constriction structure 9 along the direction from top to bottom at the bottom position, and each section forms an independent cavity. In this embodiment, the liquid pipe is a segmented structure, each segment is an independent individual, and the segments are independent from each other and are not related to each other. The corresponding adapter 2 realizes the connection.

The constriction structure 9 at the bottom of the segment can be connected to the capillary, and when the refrigerant flows from the first header 3 to the second header 4, it can be sprayed from the segmented constriction 9 of the first header 3 Enter into the interior of the subsection, thereby further increasing the flow rate of the refrigerant in the subsection, slowing down the gas-liquid stratification of the refrigerant in the subsection, making the liquid separation of the refrigerant entering the heat exchange flat tube 1 more uniform, and improving the performance of the heat exchanger.

The second header 4 is, for example, a gas pipe. When the second header 4 and the flat heat exchange tube 1 are connected through the adapter 2, the connection between the related structure and the first header 3 and the flat heat exchange tube 1 The structure is similar and will not be described in detail here.

Referring to FIG. 6 , according to an embodiment of the present application, the air conditioner includes a microchannel heat exchanger, and the microchannel heat exchanger is the above-mentioned microchannel heat exchanger.

The air conditioner also includes a compressor 10, a four-way valve 11, a throttling device 12 and a first heat exchanger 13. The compressor 10, the first heat exchanger 13, the throttling device 12 and the microchannel heat exchanger are connected in sequence. The through valve 11 is installed at the discharge port of the compressor 10 .

The air conditioner also includes a splitter 14. The first header 3 of the micro-channel heat exchanger is a liquid pipe, and the first header 3 forms at least two cavities arranged at intervals along the axial direction. The cavities are connected in one-to-one correspondence.

When the microchannel heat exchanger is used as a condenser, the a and b of the four-way valve 11 are connected, and the c and d are connected. The refrigerant discharged from the compressor 10 passes through the four-way valve 11, and then enters through the air pipe of the microchannel heat exchanger. The heat exchange flat tube 1 is condensed and released, and then flows out through the liquid pipes in N paths, and then enters the throttling device 12 for throttling after being merged by the flow divider 14, and then enters the first heat exchanger 13 for evaporation and heat absorption, and then passes through four The valve 11 returns to the compressor 10, completing the cycle.

When the micro-channel heat exchanger is used as an evaporator, a of the four-way valve 11 is connected with c, and b is connected with d, and the refrigerant discharged from the compressor 10 enters the first heat exchanger 13 through the four-way valve 11 for condensation and heat release, Then enter the throttling device 12 for throttling, and then pass through the diverter 14 to divide into N paths and enter the liquid pipe of the micro-channel heat exchanger 6, and then enter the heat exchange flat tube 1 through the liquid pipe for evaporation and heat absorption, and then from the gas pipe The outlet flows out, and finally returns to the compressor 10 through the four-way valve 11 to complete the cycle.

Those skilled in the art can easily understand that, under the premise of no conflict, the above-mentioned advantageous manners can be combined and superimposed freely.

The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. Inside. The above are only the preferred embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, several improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of this application.

Claims (12)

1. A micro-channel heat exchanger is characterized by comprising a heat exchange flat pipe (1), an adapter (2), a first collecting pipe (3) and a second collecting pipe (4), wherein the first collecting pipe (3) is arranged at the first end of the heat exchange flat pipe (1), the second collecting pipe (4) is arranged at the second end of the heat exchange flat pipe (1), the adapter (2) extends along the width direction of the heat exchange flat pipe (1), wherein,

the adapter (2) is arranged at the first end of the heat exchange flat pipe (1), and the first end of the heat exchange flat pipe (1) is connected to the first collecting pipe (3) through the adapter (2);

and/or, adaptor (2) set up the second end of heat transfer flat pipe (1), the second end of heat transfer flat pipe (1) passes through adaptor (2) are connected on second pressure manifold (4).

2. The micro-channel heat exchanger according to claim 1, wherein the adaptor (2) is provided with a flat tube groove (5) extending along a length direction, the flat heat exchange tube (1) is installed in the flat tube groove (5), a tube opening of the adaptor (2) located at a first end of the flat heat exchange tube (1) is connected to the first collecting tube (3), and/or a tube opening of the adaptor (2) located at a second end of the flat heat exchange tube (1) is connected to the second collecting tube (4).

3. The microchannel heat exchanger according to claim 1, wherein the adapter (2) is sealed by a closure (6) away from the orifice of the header.

4. The microchannel heat exchanger according to claim 1, wherein the first header (3) is a liquid pipe, the adaptor (2) is connected between the first end of the flat heat exchange pipe (1) and the liquid pipe, and the diameter of the liquid pipe is smaller than the width of the flat heat exchange pipe (1).

5. The microchannel heat exchanger of claim 4, wherein the length of the adapter (2) extending into the tube is half the radius of the inner bore of the tube.

6. The microchannel heat exchanger according to claim 4, wherein the adaptor (2) at the first end of the heat exchange flat tube (1) is connected to the heat exchange flat tube (1) in a one-to-one correspondence.

7. The microchannel heat exchanger of claim 4, wherein the liquid tube forms at least two spaced cavities in the axial direction, each cavity being correspondingly connected with the adapter (2).

8. The microchannel heat exchanger according to claim 7, wherein the liquid pipe is provided with at least one partition groove (7), a spacer (8) is installed in the partition groove (7), and the spacer (8) is configured to axially partition the liquid pipe into at least two cavities.

9. The microchannel heat exchanger of claim 7, wherein the liquid tube comprises at least two axially spaced segments, at least one of the segments forming a constriction (9) at a bottom location in a direction from top to bottom, each segment forming a separate cavity.

10. An air conditioner comprising a microchannel heat exchanger, wherein the microchannel heat exchanger is as claimed in any one of claims 1 to 9.

11. The air conditioner according to claim 10, further comprising a compressor (10), a four-way valve (11), a throttling device (12) and a first heat exchanger (13), wherein the compressor (10), the first heat exchanger (13), the throttling device (12) and the microchannel heat exchanger are connected in sequence, and the four-way valve (11) is installed at an exhaust port of the compressor (10).

12. The air conditioner according to claim 11, further comprising a flow divider (14), wherein the first collecting pipe (3) of the microchannel heat exchanger is a liquid pipe, the first collecting pipe (3) forms at least two cavities arranged at intervals along the axial direction, and branch ports of the flow divider (14) are connected with the cavities in a one-to-one correspondence manner.

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