WO2021077895A1

WO2021077895A1 - Flat pipe, micro-channel heat exchanger, and air conditioner

Info

Publication number: WO2021077895A1
Application number: PCT/CN2020/111847
Authority: WO
Inventors: 魏文建; 马文勇; 梁新宇
Original assignee: 浙江盾安人工环境股份有限公司
Priority date: 2019-10-21
Filing date: 2020-08-27
Publication date: 2021-04-29
Also published as: CN112762731A; JP2022552079A; JP7357773B2

Abstract

A flat pipe (20), a micro-channel heat exchanger (80), and an air conditioner. The flat pipe (20) comprises two thin plates (10); the two thin plates (10) are welded to form the flat pipe (20); the flat pipe (20) comprises a straight section (11, 13, 15) and a transition section (12, 14) which are connected to each other and are located on a same plane; an included angle is formed between the straight section (11, 13, 15) and the transition section (12, 14) in a plane direction of the flat pipe (20); the straight section (11, 13, 15) and the transition section (12, 14) are formed by pressing; the micro-channel heat exchanger (80) comprises multiple flat pipes (20) arranged side by side, a flow collection assembly (30) provided at two ends of the flat pipe (20) and communicated with same, fins (40) provided on two sides of the flat pipe (20) and having the same shape as the flat pipe (20), and a side plate (50) provided on two sides of the micro-channel heat exchanger (80) and having the same shape as the flat pipe (20); the air conditioner comprises the micro-channel heat exchanger (80). The included angle is formed between the straight section (11, 13, 15) and the transition section (12, 14) of the flat pipe (20), so that the size of the flat pipe (20) and the micro-channel heat exchanger (80) is reduced, thereby facilitating mounting same in the air conditioner; the straight section (11, 13, 15) and the transition section (12, 14) are formed by pressing, so that the flat pipe (20) does not need to be bent, thereby facilitating machining and preventing cracking.

Description

Flat tubes, micro-channel heat exchangers and air conditioners

This application claims the priority of the patent application filed to the State Intellectual Property Office of China on October 21, 2019, with the application number of 201911001998.6 and the invention title of "flat tube, microchannel heat exchanger and air conditioner".

Technical field

This application relates to the technical field of air conditioners, and specifically to a flat tube, a microchannel heat exchanger and an air conditioner.

Background technique

Currently, split air conditioners include indoor units and outdoor units. Among them, the indoor unit heat exchanger adopts a finned tube heat exchanger for heat exchange. Because micro-channel heat exchangers have the advantages of high heat exchange efficiency and low refrigerant charge, in the field of commercial air conditioning, micro-channel heat exchangers have replaced fin-tube heat exchangers and have achieved great success. Therefore, it is very necessary to develop a A micro-channel heat exchanger to replace the finned tube heat exchanger of household air conditioners.

However, in related technologies, the installation space for the heat exchanger of the split-type air conditioner indoor unit is very limited. Due to the limitation of the installation space and structure, it is necessary to perform multiple bending operations on the microchannel heat exchanger, which will cause micro-channel heat exchangers. The channel heat exchanger is bent and cracked and cannot be used normally. Therefore, there is a problem in the related art that the micro-channel heat exchanger cannot meet the usage requirements.

Summary of the invention

This application provides a flat tube, a micro-channel heat exchanger and an air conditioner to solve the problem that the micro-channel heat exchanger in the related art cannot meet the use requirements.

According to one aspect of the present application, a flat tube is provided. The flat tube includes two thin plates. The two thin plates are welded to form a flat tube. The flat tube includes a straight section and a transition section connected to each other. The straight section and the transition section are located at the same Plane, in the plane direction of the flat tube, there is an angle between the straight section and the transition section, and the straight section and the transition section are stamped.

Further, the flat tube has a plurality of straight sections, the transition section is arranged between two adjacent straight sections, and the side wall of the transition section has a curved structure along the extending direction.

Further, the flat tube has a first straight section, a first transition section, a second straight section, a second transition section, and a third straight section that are sequentially connected. There is an included angle between the second straight section and the third straight section, and the free end of the first straight section and the free end of the third straight section are located on the same side of the second straight section.

Further, the included angle between the first straight section and the second straight section is a, and 75°≤a≤105°, the included angle between the second straight section and the third straight section is b, And 85°≤b≤135°.

Further, the thin plate is provided with a plurality of connecting protrusions, and the two thin plates are connected by the connecting protrusions to form a flat tube. The flat tube is used to surround the outside of the fan. The flat tube has opposite inner and outer sides, and the inner side of the flat tube It is arranged close to the fan, and the size of the connecting protrusion on at least part of the transition section gradually increases from the inner side of the flat tube to the outer side of the flat tube.

Further, in the length direction of the transition section, the transition section is provided with multiple rows of connecting protrusions, the size of at least one row of connecting protrusions remains unchanged, and the size of at least one row of connecting protrusions gradually changes from the inner side of the flat tube to the outer side of the flat tube Increase.

Further, in a direction parallel to the plane of the flat tube, the cross-sectional shape of at least part of the connecting convex portion is a long strip.

According to another aspect of the present application, a microchannel heat exchanger is provided. The microchannel heat exchanger includes: a plurality of flat tubes, the plurality of flat tubes are arranged side by side, and the flat tubes are the flat tubes provided above; and a current collecting assembly, Set at both ends of the flat tube, a plurality of flat tubes are communicated with the current collecting assembly; fins, both sides of the flat tube are provided with fins, the shape of the fins is the same as that of the flat tube; the side plates are set in the micro On both sides of the channel heat exchanger, the side plates have the same shape as the flat tubes.

Further, the current collecting assembly includes two headers, the header is provided with a plurality of distribution ports, the plurality of distribution ports are arranged in a one-to-one correspondence with the plurality of flat tubes, and the flat tubes communicate with the header through the distribution ports; The end cover is arranged at the end of the collecting pipe; the inlet pipe passes through the end cover, and the inlet pipe is connected with one of the collecting pipes; the outlet pipe passes through the end cover, and the outlet pipe is connected to the other collecting pipe Connected.

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

Applying the technical solution of the present application, the flat tube includes two thin plates, and the two thin plates are welded to form the flat tube. Among them, the flat tube includes a straight section and a transition section connected to each other, and the straight section and the transition section are located on the same plane. Specifically, in the plane direction of the flat tube, there is an angle between the straight section and the transition section, and the straight section and the transition section are stamped. With the above structure, due to the included angle between the straight section and the transition section, the volume of the flat tube can be reduced, so that the size of the microchannel heat exchanger can be reduced, and the microchannel heat exchanger can be smoothly installed inside the air conditioner. In addition, since the straight section and the transition section are stamped, there is no need to bend the flat tube, which facilitates the processing of the flat tube without cracking.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Figure 1 shows a schematic structural diagram of a flat tube provided according to an embodiment of the present application;

Figure 2 shows a partial enlarged view of A in Figure 1;

Fig. 3 shows a partial enlarged view at B in Fig. 1;

Figure 4 shows a cross-sectional view at C-C in Figure 1;

Fig. 5 shows another structural schematic diagram of a flat tube provided according to an embodiment of the present application;

Figure 6 shows an exploded view of the microchannel heat exchanger provided according to an embodiment of the present application;

Figure 7 shows another exploded view of the microchannel heat exchanger provided according to an embodiment of the present application;

Fig. 8 shows an assembly diagram of a microchannel heat exchanger provided according to an embodiment of the present application;

Fig. 9 shows a schematic structural diagram of an air conditioner provided according to an embodiment of the present application.

Among them, the above drawings include the following reference signs:

10. Thin plate; 11. The first straight section; 12. The first transition section; 13. The second straight section; 14. The second transition section; 15. The third straight section; 16. The connecting protrusion;

20. Flat tube;

30. Collecting assembly; 31. Collecting pipe; 311. Distribution port; 32. End cover; 33. Inlet pipe; 34. Outlet pipe;

40. Fin; 50. Side plate; 60. Drain pan; 70. Fan; 80. Micro-channel heat exchanger;

a. The angle between the first straight section and the second straight section;

b. The angle between the second straight section and the third straight section.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any restriction on the application and its application or use. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

As shown in FIGS. 1 to 5, the embodiments of the present application provide a flat tube. The flat tube includes two thin plates 10. By welding the two thin plates 10, the two thin plates 10 can be formed into a flat tube. Among them, the flat tube includes a straight section and a transition section that are connected to each other, and the straight section and the transition section are located on the same plane, which is convenient for assembling the flat tube with other components. The flat section and the transition section of the flat tube can be combined with other parts. The parts fit together or keep a certain distance. In this embodiment, in the plane direction of the flat tube, there is an included angle between the flat section and the transition section, which is convenient for reducing the size of the flat tube, and the flat section and the transition section are stamped, and there is no need to perform the flat tube. Bending can ensure the structural strength of the flat tube. Wherein, the flat tube may include a plurality of straight sections and transition sections, and the number and size of the straight sections and transition sections and the angle between the straight sections and the transition sections can be set according to actual requirements.

Using the flat tube provided in this embodiment, the volume of the flat tube can be reduced by making the angle between the straight section and the transition section, so that the size of the microchannel heat exchanger can be reduced, and the microchannel heat exchanger can be smoothly transferred. The air conditioner is installed inside the air conditioner. Since the straight section and the transition section are stamped, there is no need to bend the flat tube, which facilitates the processing of the flat tube without cracking, and can improve the structural strength of the flat tube. In addition, since the flat tube is formed by pressing two thin plates 10 and then welded, it has the advantage of easy processing. By processing the flat tube into various shapes, the practicality of the flat tube can be improved.

In this embodiment, the processing process of the flat tube includes: punching the thin plate 10 according to the use and installation requirements, and punching the thin plate 10 into a preset shape and a preset shape by controlling the length and angle of the straight section and the transition section. Size, and then weld the stamped thin plate 10 to form a flat tube.

In related technologies, the installation space for the heat exchanger of the split air conditioner indoor unit is very limited. In fact, the size of the heat exchanger core generally does not exceed 300 mm. Among them, limited by factors such as installation space and structure, the finned tube heat exchanger adopts a multi-piece combination form. With the flat tube provided in this embodiment, the flat tube does not need to be bent and divided into blocks, which is convenient for assembly.

Wherein, the side wall of the transition section may be a linear structure or a curved structure along the extension direction, and the side wall structure of the transition section may be set according to requirements. In this embodiment, the flat tube has a plurality of straight sections, and the transition section is arranged between two adjacent straight sections. In order to facilitate the assembly of the flat tube, multiple straight sections are located on the same side of the transition section, which can further reduce the volume of the flat tube. Specifically, the side wall of the transition section has a curved structure along the extending direction, which facilitates the assembly of the flat tube, and the flat tube does not interfere with other components.

In this embodiment, the flat tube has a first straight section 11, a first transition section 12, a second straight section 13, a second transition section 14, and a third straight section 15 that are connected in sequence, and the first straight section There is an included angle between the straight section 11 and the second straight section 13, the second straight section 13 and the third straight section 15 have an included angle, and the free end of the first straight section 11 and the third straight section The free end of the section 15 is located on the same side of the second straight section 13. With the above structure, the first straight section 11, the first transition section 12, the second straight section 13, the second transition section 14, and the third straight section 15 can form a hook-like structure, which is convenient for assembly. In other embodiments, the number of straight sections and transition sections is increased or decreased.

In order to facilitate assembly, the included angle between the first straight section 11 and the second straight section 13 is a, and 75°≤a≤105°, between the second straight section 13 and the third straight section 15 The included angle is b, and 85°≤b≤135°. By setting the included angle a and the included angle b within the above range, the flat tube and the micro-channel heat exchanger formed by the flat tube can be assembled into the installation space of the air conditioner. Specifically, the included angle a and the included angle b can be set in accordance with the specific structure and size of the air-conditioning installation space. Among them, the angle a can be 80°, 85°, 90°, 95° and 100°, and the angle b can be 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125° And 130°.

Specifically, a plurality of connecting protrusions 16 are provided on the thin plate 10, and two thin plates 10 are connected by the connecting protrusions 16 to form a flat tube. When the two thin plates 10 are welded, the two corresponding connecting protrusions 16 can be welded, which is convenient for welding. In addition, the plurality of connecting protrusions 16 are arranged at intervals, and the medium can flow in the interval of the plurality of connecting protrusions 16. Among them, the flat tube is used to surround the outside of the fan, the flat tube has opposite inner and outer sides, the inner side of the flat tube is arranged close to the fan, and a plurality of straight sections all extend toward the inner side of the flat tube. In order to improve the connection strength, the size of the connecting protrusion 16 on a part of the transition section gradually increases from the inner side of the flat tube to the outer side of the flat tube. Since the outer side of the flat tube is subjected to greater force, when the thin plate 10 is welded, the size of the connecting protrusion 16 on the outer side of the flat tube can be made larger, so that the overall structural strength of the flat tube can be ensured.

In this embodiment, in the length direction of the transition section, the transition section is provided with multiple rows of connecting protrusions 16, the size of at least one row of connecting protrusions 16 remains unchanged, and the size of at least one row of connecting protrusions 16 is determined from the inner side of the flat tube. Gradually increase to the outside of the flat tube, so that while ensuring the connection strength of the flat tube, the circulation space of the medium can be ensured. Specifically, in the transition section, the size of one of the connecting protrusions 16 of the two adjacent rows of connecting protrusions 16 remains unchanged, and the size of the other row of connecting protrusions 16 gradually increases from the inner side of the flat tube to the outer side of the flat tube. Big.

In this embodiment, in the direction parallel to the plane of the flat tube, the cross-sectional shape of at least part of the connecting protrusion 16 is elongated. In addition, the extension direction of the connecting protrusion 16 extends along the length direction of the transition section, so that while ensuring the connection strength, the increased size of the connecting protrusion 16 will not affect the flow of the medium. Specifically, on the transition section, the size of one row of the connecting protrusions 16 in two adjacent rows of connecting protrusions 16 remains unchanged, and the cross-sectional shape of the row of connecting protrusions 16 is circular, and the other row of connecting protrusions 16 The size of is gradually increased from the inner side of the flat tube to the outer side of the flat tube, and the cross-sectional shape of the row of connecting protrusions 16 is a long strip.

As shown in FIGS. 6 to 8, another embodiment of the present application provides a microchannel heat exchanger, which includes a plurality of flat tubes 20, a current collecting assembly 30, fins 40, and a side plate 50. . Wherein, a plurality of flat tubes 20 are arranged side by side, and the flat tubes 20 are the flat tubes provided above, so that the volume of the microchannel heat exchanger can be reduced, so that the microchannel heat exchanger can be used in an air conditioner with a small installation space. Wherein, the current collecting assembly 30 is arranged at both ends of the flat tube 20, and a plurality of flat tubes 20 are communicated with the current collecting assembly 30. Both sides of the flat tube 20 are provided with fins 40. The shape of the fins 40 is the same as that of the flat tube. The shape of the side plate 20 is the same, the side plates 50 are arranged on both sides of the microchannel heat exchanger, and the shape of the side plate 50 is the same as that of the flat tube 20. Specifically, the microchannel heat exchanger includes an all-aluminum microchannel heat exchanger.

Specifically, the collecting assembly 30 includes two collecting pipes 31, an end cap 32, an inlet pipe 33, and an outlet pipe 34. Each collecting pipe 31 is provided with a plurality of distribution ports 311, and a plurality of distribution ports 311 and The flat tubes 20 are arranged in one-to-one correspondence, and the flat tubes 20 are in communication with the header 31 through the distribution port 311. Wherein, the end cap 32 is arranged at the end of the header 31, the inlet pipe 33 and the outlet pipe 34 are both pierced on the end cap 32, the inlet pipe 33 is in communication with one of the header pipes 31, and the outlet pipe 34 is connected with the other. The flow pipe 31 is in communication, and the medium can enter the header 31 through the inlet pipe 33. After heat exchange through the flat tube 20, the medium can flow out of the outlet pipe 34 through another header 31.

Among them, a water receiving pan 60 is also provided at both ends of the microchannel heat exchanger, and the water receiving pan 60 can be used to collect the condensed water, so as to prevent the condensed water from damaging other components. Specifically, the micro-channel heat exchanger is arranged around the outer circumference of the fan 70, so that the heat exchange efficiency can be improved.

As shown in FIG. 9, another embodiment of the present application provides an air conditioner, which includes the micro-channel heat exchanger 80 provided above. By using the microchannel heat exchanger, the heat exchange efficiency can be improved, and the assembly can be facilitated. Wherein, the air conditioner includes a split wall-mounted air conditioner.

The device provided by this embodiment has the following beneficial effects:

(1) The thin plate of the micro-channel heat exchanger is integrally stamped and formed into a hook shape at one time (non-bending operation). The core of the micro-channel heat exchanger does not need to be bent, which avoids the use of conventional micro-channel heat exchangers. Multiple bending problems within the size range can significantly improve product reliability;

(2) The core body of the micro-channel heat exchanger is designed in a "hook" shape, which has the advantage of compact structure, is convenient to match with the installation space, and can save space. During installation, the collecting pipe 31 is horizontal and the flat pipe 20 is vertical. The condensed water can flow into the drain pan 60 along the wall of the flat pipe and be drained, and the drainage capacity is stronger;

(3) Compared with the copper tube aluminum fin heat exchanger, the heat exchanger provided in this embodiment has the general advantages of an all-aluminum microchannel heat exchanger, with high heat exchange efficiency, low refrigerant charge, low cost, and easy Recycling and other advantages;

(4) Compared with the conventional micro-channel heat exchanger, the flat tube of the micro-channel heat exchanger provided in this embodiment is stamped with a strong corrosion-resistant multilayer composite aluminum foil, which has stronger corrosion resistance than the hot-extruded porous flat tube.

It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof.

Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn in accordance with actual proportional relationships. The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the authorization specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

In the description of this application, it needs to be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" and other directions indicate the orientation Or positional relationship is usually based on the positional or positional relationship shown in the drawings, which is only used to facilitate the description of the application and simplify the description. Unless otherwise stated, these positional words do not indicate or imply the pointed device or element It must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the scope of protection of the present application; the orientation word "inside, outside" refers to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms can be used here, such as "above", "above", "above the surface", "above", etc., to describe as shown in the figure Shows the spatial positional relationship between one device or feature and other devices or features. It should be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the drawing is turned upside down, then a device described as "above other devices or structures" or "above other devices or structures" will then be positioned as "below the other devices or structures" or "on Under other devices or structures". Thus, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways (rotated by 90 degrees or in other orientations), and the relative description of the space used here will be explained accordingly.

In addition, it should be noted that the use of terms such as “first” and “second” to define parts is only for the convenience of distinguishing the corresponding parts. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood. To limit the scope of protection of this application.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

A flat tube, wherein the flat tube includes two thin plates (10), and the two thin plates (10) are welded to form the flat tube, and the flat tube includes a straight section and a transition section that are connected to each other. The straight section and the transition section are located on the same plane, in the plane direction of the flat tube, there is an angle between the straight section and the transition section, and the straight section and the transition section Stamped.
The flat tube according to claim 1, wherein the flat tube has a plurality of the straight sections, the transition section is arranged between two adjacent straight sections, and the side of the transition section The wall has a curved structure along the extending direction.
The flat tube according to claim 1, wherein the flat tube has a first straight section (11), a first transition section (12), a second straight section (13), and a second transition which are connected in sequence. Section (14) and a third straight section (15), the first straight section (11) and the second straight section (13) have an angle between them, and the second straight section (13) ) And the third straight section (15) have an included angle, and the free end of the first straight section (11) and the free end of the third straight section (15) are located in the first straight section (15) Two straight sections (13) on the same side.
The flat tube according to claim 3, wherein the included angle between the first straight section (11) and the second straight section (13) is a, and 75°≤a≤105°, The angle between the second straight section (13) and the third straight section (15) is b, and 85°≤b≤135°.
The flat tube according to claim 1, wherein the thin plate (10) is provided with a plurality of connecting protrusions (16), and two pieces of the thin plate (10) are connected by the connecting protrusions (16) to form The flat tube, the flat tube is used to surround the outside of the fan, the flat tube has opposite inner and outer sides, the inner side of the flat tube is close to the fan, and at least part of the transition section The size of the connecting convex portion (16) gradually increases from the inner side of the flat tube to the outer side of the flat tube.
The flat tube according to claim 5, wherein in the length direction of the transition section, the transition section is provided with a plurality of rows of the connecting protrusions (16), at least one row of the connecting protrusions (16) The size remains unchanged, and the size of at least one row of the connecting protrusions (16) gradually increases from the inner side of the flat tube to the outer side of the flat tube.
The flat tube according to claim 5, wherein, in a direction parallel to the plane of the flat tube, at least part of the connecting convex portion (16) has a long cross-sectional shape.
A micro-channel heat exchanger, wherein the micro-channel heat exchanger includes:

A plurality of flat tubes (20), a plurality of the flat tubes (20) are arranged side by side, and the flat tubes (20) are the flat tubes according to any one of claims 1 to 7;

The current collecting assembly (30) is arranged at both ends of the flat tube (20), and a plurality of the flat tubes (20) are all in communication with the current collecting assembly (30);

Fins (40), the fins (40) are provided on both sides of the flat tube (20), and the shape of the fins (40) is the same as that of the flat tube (20);

Side plates (50) are arranged on both sides of the microchannel heat exchanger, and the side plates (50) and the flat tube (20) have the same shape.
The microchannel heat exchanger according to claim 8, wherein the current collecting assembly (30) comprises:

Two headers (31), the header (31) is provided with a plurality of distribution ports (311), and the plurality of distribution ports (311) correspond to the plurality of flat tubes (20) one-to-one Provided that the flat tube (20) communicates with the header (31) through the distribution port (311);

An end cover (32), arranged at the end of the header (31);

The inlet pipe (33) passes through the end cover (32), and the inlet pipe (33) is in communication with one of the collecting pipes (31);

The outlet pipe (34) is pierced on the end cover (32), and the outlet pipe (34) is in communication with the other collecting pipe (31).
An air conditioner, wherein the air conditioner comprises the microchannel heat exchanger according to claim 8.