CN216620047U

CN216620047U - Heat exchanger assembly and air conditioner indoor unit with same

Info

Publication number: CN216620047U
Application number: CN202123030523.5U
Authority: CN
Inventors: 谢李高; 张晶晶
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-05-27
Anticipated expiration: 2031-12-03

Abstract

The utility model discloses a heat exchanger assembly and an air conditioner indoor unit with the same, wherein the heat exchanger assembly comprises: the main heat exchanger comprises a front heat exchanger and a rear heat exchanger, and the front heat exchanger comprises an upper heat exchange part and a lower heat exchange part; an auxiliary heat exchanger; the lower ends of the lower heat exchange part and the upper heat exchange part are first areas, the upper end of the upper heat exchange part is a second area, the heat exchange flow path of the heat exchanger assembly comprises a first flow path, a second flow path and a third flow path, the first flow path flows through a fourth heat exchange tube of the auxiliary heat exchanger, the second flow path comprises a first branch, a second branch, a third branch and a fourth branch which are connected in parallel, all third heat exchange tubes of the rear heat exchanger and all first heat exchange tubes and all second heat exchange tubes of the second area are formed by the first branch to the fourth branch, the third flow path flows through all first heat exchange tubes and all second heat exchange tubes of the first area, and when the heat exchanger assembly is used for refrigerating, a refrigerant sequentially flows through the first flow path, the second flow path and the third flow path. The heat exchanger assembly provided by the utility model has high heat exchange energy efficiency.

Description

Heat exchanger assembly and air conditioner indoor unit with same

Technical Field

The utility model relates to the technical field of air treatment equipment, in particular to a heat exchanger assembly and an air conditioner indoor unit with the same.

Background

In the related technology, along with the requirement of the market on the higher energy efficiency of the air conditioner, the length of the evaporator needs to be increased for realizing high energy efficiency, the strict limitation of the indoor unit size of a room in a special area cannot be met, and the conventional heat exchanger usually only comprises one pipe diameter and cannot be well adapted to the state change of a refrigerant, so that the heat exchange effect of the refrigerant can be brought into play to the best state.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. To this end, the utility model proposes a heat exchanger assembly which is energy-efficient.

The utility model further provides an air conditioner which comprises the heat exchanger assembly.

A heat exchanger assembly according to an embodiment of the utility model comprises: the heat exchanger comprises a main heat exchanger and a heat exchanger body, wherein the main heat exchanger comprises a front heat exchanger and a rear heat exchanger, the front heat exchanger comprises an upper heat exchange part and a lower heat exchange part, the upper end of the upper heat exchange part is connected with the upper end of the rear heat exchanger, the upper end of the lower heat exchange part is integrally connected with the lower end of the upper heat exchange part, the front heat exchanger comprises a first heat exchange tube and a second heat exchange tube, and the rear heat exchanger comprises a third heat exchange tube; the auxiliary heat exchanger is arranged on the windward side of the main heat exchanger and is provided with a fourth heat exchange tube; the lower and upper heat exchange portions have lower end portions configured as a first region and the remaining portion of the upper heat exchange portion configured as a second region, the first and second regions each including the first and second heat exchange tubes, the heat exchange flow path of the heat exchanger assembly including a first flow path flowing through the fourth heat exchange tube of the auxiliary heat exchanger, a second flow path including first, second, third and fourth branches connected in parallel, the first to fourth branches constituting all the third heat exchange tubes of the rear heat exchanger and all the first and second heat exchange tubes of the second region, and a third flow path flowing through all the first and second heat exchange tubes of the first region, when the heat exchanger assembly is refrigerating, the refrigerant flows through the first flow path, the second flow path and the third flow path in sequence.

According to the heat exchanger component of the embodiment of the utility model, the auxiliary heat exchanger is arranged on the windward side of the main heat exchanger, the first heat exchange tube and the second heat exchange tube are arranged in the front heat exchanger, the third heat exchange tube is arranged in the rear heat exchanger, the fourth heat exchange tube is arranged in the auxiliary heat exchanger, the heat exchange flow path of the heat exchanger comprises a first flow path, a second flow path and a third flow path, the first flow path flows through the fourth heat exchange tube of the auxiliary heat exchanger, the second flow path comprises a first branch, a second branch, a third branch and a fourth branch which are connected in parallel, all the third heat exchange tubes of the rear heat exchanger and all the first heat exchange tubes and all the second heat exchange tubes of the second area are formed by the first branch to the fourth branch, the third flow path flows through all the first heat exchange tubes and all the second heat exchange tubes of the first area, and when the heat exchanger component is used for refrigeration, the refrigerant sequentially flows through the first flow path, the second flow path and the third flow path, the heat exchange energy efficiency of the heat exchanger assembly can be improved.

According to some embodiments of the present invention, a pipe diameter of the fourth heat exchange pipe is greater than a pipe diameter of the third heat exchange pipe, the pipe diameter of the third heat exchange pipe is equal to a pipe diameter of the second heat exchange pipe, and the pipe diameter of the second heat exchange pipe is greater than a pipe diameter of the first heat exchange pipe.

In some embodiments of the utility model, the second heat exchange tube is located on the leeward side of the first heat exchange tube in the first region, and the second heat exchange tube is located on the windward side of the first heat exchange tube in the second region.

In some embodiments of the present invention, the first branch flows through a part of the third heat exchange tubes of the rear heat exchanger and all of the first heat exchange tubes of the second region, the second branch flows through a part of the third heat exchange tubes of the rear heat exchanger and a part of the second heat exchange tubes of the second region, the third branch flows through a part of the third heat exchange tubes of the rear heat exchanger and the rest of the second heat exchange tubes of the second region, and the fourth branch flows through a rest of the third heat exchange tubes of the rear heat exchanger.

In some embodiments of the present invention, the first to fourth branches each flow from the second zone or the inlet side of the rear heat exchanger to the second zone or the outlet side of the rear heat exchanger.

In some embodiments of the present invention, the third flow path includes a sixth branch, a seventh branch, an eighth branch, a ninth branch, a tenth branch and an eleventh branch, and the sixth branch to the eleventh branch constitute all the first heat exchange tube and the second heat exchange tube of the first region.

In some embodiments of the present invention, when the heat exchanger assembly is used for cooling, the refrigerant in each of the sixth to eleventh branches flows from the first heat exchange tube to the second heat exchange tube.

According to some embodiments of the utility model, the auxiliary heat exchanger comprises a first auxiliary heat exchanger located on a windward side of the rear heat exchanger and a second auxiliary heat exchanger located on a windward side of the upper heat exchange portion.

In some embodiments of the present invention, the first flow path includes a first main path, a twelfth path and a thirteenth path, the first main path flows through a part of the fourth heat exchange tubes of the second auxiliary heat exchanger, the twelfth path flows through a part of the fourth heat exchange tubes of the second auxiliary heat exchanger and a part of the fourth heat exchange tubes of the first auxiliary heat exchanger, the thirteenth path flows through the remaining part of the fourth heat exchange tubes of the second auxiliary heat exchanger and the remaining part of the fourth heat exchange tubes of the first auxiliary heat exchanger, and when the heat exchanger assembly performs refrigeration, the refrigerant flows through the first main path and then flows to the twelfth path and the thirteenth path simultaneously.

In some embodiments of the present invention, the pipe diameter of the fourth heat exchange pipe is 7mm, the pipe diameters of the third heat exchange pipe and the second heat exchange pipe are 6.35mm, and the pipe diameter of the first heat exchange pipe is 5 mm.

The air conditioner indoor unit provided by the embodiment of the utility model comprises the heat exchanger assembly.

According to the air-conditioning indoor unit provided by the embodiment of the utility model, the heat exchanger component is arranged, the auxiliary heat exchanger is arranged on the windward side of the main heat exchanger, the first heat exchange tube and the second heat exchange tube are arranged in the front heat exchanger, the third heat exchange tube is arranged in the rear heat exchanger, the fourth heat exchange tube is arranged in the auxiliary heat exchanger, the heat exchange flow path of the heat exchanger comprises a first flow path, a second flow path and a third flow path, the first flow path flows through the fourth heat exchange tube of the auxiliary heat exchanger, the second flow path comprises a first branch, a second branch, a third branch and a fourth branch which are connected in parallel, all the third heat exchange tubes of the rear heat exchanger and all the first heat exchange tubes and all the second heat exchange tubes of the second area are formed by the first branch to the fourth branch, and when the heat exchanger component is used for refrigerating, a refrigerant sequentially flows through the first flow path and the second heat exchange tubes of the first area, The second flow path and the third flow path can improve the heat exchange energy efficiency of the heat exchanger assembly.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

fig. 2 is a schematic view illustrating a flow path of a refrigerant of a heat exchanger according to an embodiment of the present invention.

Reference numerals:

100. a heat exchanger assembly;

1. a primary heat exchanger; 11. a front heat exchanger; 111. an upper heat exchanging part; 112. a lower heat exchanging portion; 113. a first heat exchange tube; 114. a second heat exchange tube; 115. a first region; 116. a second region; 12. a rear heat exchanger; 121. a third heat exchange tube;

2. an auxiliary heat exchanger; 21. a fourth heat exchange tube; 22. a first auxiliary heat exchanger; 23. a second auxiliary heat exchanger;

3. a first flow path; 31. a first main road; 32. a twelfth branch; 33. a thirteenth branch;

4. a second flow path; 41. a first branch; 42. a second branch circuit; 43. a third branch; 44. a fourth branch;

5. a third flow path; 51. a sixth branch; 52. a seventh branch; 53. an eighth branch; 54. a ninth branch; 55. a tenth branch; 56. an eleventh branch.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

A heat exchanger assembly 100 and an air conditioning indoor unit according to an embodiment of the present invention will be described with reference to fig. 1 and 2.

The air conditioner indoor unit according to the embodiment of the utility model comprises a shell, a wind wheel and a heat exchanger assembly 100. The air-conditioning indoor unit is an indoor unit of a wall-mounted split air conditioner, but may be an indoor unit or an indoor unit of another air conditioner, and is not limited thereto.

Specifically, the housing has an air inlet disposed at an upper side of the housing and an air outlet disposed at a lower side of the housing. Generally, the width of the case in the front-rear direction is 800mm or less, and the height of the case in the up-down direction is 300mm or less. The wind wheel is arranged in the shell to drive airflow to flow from the air inlet to the air outlet. The wind wheel is a cross-flow wind wheel, but may also be other wind wheels, such as an axial-flow wind wheel.

An embodiment of this application is applied to wall-hanging air conditioning for heat exchanger assembly 100 and is indoor set, and indoor set of air conditioning includes the casing and is located the wind wheel of casing, and heat exchanger assembly 100 establishes in the casing and is located the air inlet side of wind wheel to carry out the heat transfer to the inspiratory air of wind wheel, realize the refrigeration or the effect of heating in room. Wherein, the wind wheel can be a cross flow wind wheel.

When the indoor unit of the air conditioner works, the motor drives the wind wheel to rotate, under the action of the wind wheel, airflow is driven to flow from the air inlet to the air outlet, the airflow enters the air inlet and then exchanges heat with the heat exchanger assembly 100, the airflow after heat exchange flows to the air outlet under the action of the wind wheel, the air guide assembly can be arranged at the air outlet and can guide the airflow to a required position in a room, for example, the airflow is guided upwards, or the airflow is guided downwards, or the airflow is guided towards the left side or the right side.

It is understood that the heat exchanger assembly 100 may be applied to an air conditioner or an indoor unit or an outdoor unit of an air conditioner.

As shown in fig. 1, a heat exchanger assembly 100 according to an embodiment of the present invention includes a main heat exchanger 1 and an auxiliary heat exchanger 2.

Specifically, the main heat exchanger 1 includes a front heat exchanger 11 and a rear heat exchanger 12, the front heat exchanger 11 is located on the front side of the rear heat exchanger 12, the front heat exchanger 11 includes an upper heat exchanging portion 111 and a lower heat exchanging portion 112, an upper end (upper side as shown in fig. 1) of the upper heat exchanging portion 111 is connected to an upper end (upper side as shown in fig. 1) of the rear heat exchanger 12, and an upper end (upper side as shown in fig. 1) of the lower heat exchanging portion 112 is integrally connected to a lower end (lower side as shown in fig. 1) of the upper heat exchanging portion 111.

Wherein, lower heat transfer portion 112 and last heat transfer portion 111 body coupling mean that the fin on lower heat transfer portion 112 and the last heat transfer portion 111 is integrative, and every fin all includes the preceding heat transfer region who is located lower heat transfer portion 112 and the well heat transfer region who is located on last heat transfer portion 111, as a whole with lower heat transfer portion 112 and last heat transfer portion 111, can reduce the production degree of difficulty of lower heat transfer portion 112 and last heat transfer portion 111 from this, make things convenient for the whole assembly of heat exchanger component 100 simultaneously, and the time is saved, and then reduction in production cost.

For the shape of adaptation wind wheel better, further be close to the wind wheel, the medial surface of preceding heat exchanger 11 can set up to the cambered surface design of orientation lordosis, the medial surface of back heat exchanger 12 can set up to the cambered surface setting of orientation kyphosis for the air current of heat exchanger subassembly 100 of flowing through can be more smooth and easy, under the same operating power of wind wheel, so design can make the air current velocity of flow through heat exchanger subassembly 100 bigger, thereby promote heat exchanger subassembly 100's heat transfer efficiency.

The lower heat exchange portion 112, the upper heat exchange portion 111 and the rear heat exchanger 12 at least partially surround the wind wheel, the lower heat exchange portion 112 is arranged on the front lower portion of the wind wheel, the upper heat exchange portion 111 is arranged on the front upper portion of the wind wheel and located between the lower heat exchange portion 112 and the air inlet, the upper end of the upper heat exchange portion 111 inclines towards the rear, the lower end of the upper heat exchange portion is connected with the upper end of the lower heat exchange portion 112, the rear heat exchanger 12 is arranged on the rear upper portion of the wind wheel, and the upper end of the rear heat exchanger 12 inclines towards the front and is connected with the upper end of the upper heat exchange portion 111.

The rear heat exchanger 12 and the upper heat exchanging portion 111 are formed in a substantially inverted V shape covering the wind wheel from above in a side view. The connection part of the front heat exchanger 11 and the rear heat exchanger 12 is the part of the main heat exchanger 1 closest to the air inlet. Specifically, the distance between the connection portion of the rear heat exchanger 12 and the upper heat exchange portion 111 and the air intake is shorter than the distance between any other portion of the main heat exchanger 1 and the air intake.

It can be understood that, as shown in fig. 1, the side of the assembled air conditioning indoor unit facing the user is front, and the side facing the wall is rear, while the wall-mounted air conditioning indoor unit adopts a conventional structure with an air inlet at the top and an air outlet at the bottom, that is, the heat exchanger assembly 100 is located at the upstream of the wind wheel.

The front heat exchanger 11 includes a first heat exchange pipe 113 and a second heat exchange pipe 114, and it is understood that the heat exchange pipes of the front heat exchanger 11 include both the first heat exchange pipe 113 and the second heat exchange pipe 114. The number of the first heat exchanging pipes 113 may be multiple, the number of the second heat exchanging pipes 114 may be multiple, and the multiple first heat exchanging pipes 113 and the multiple second heat exchanging pipes 114 jointly form all the heat exchanging pipes of the front heat exchanger 11. The rear heat exchanger 12 includes a third heat exchange tube 121, and the third heat exchange tube 121 may be plural. It is to be understood that the heat exchange tubes of the rear heat exchanger 12 may have only one tube type of the third heat exchange tube 121. Of course, the heat exchange tubes of the rear heat exchanger 12 may also include other tube types, which is not limited herein.

The auxiliary heat exchanger 2 is arranged on the windward side of the main heat exchanger 1, the main heat exchanger 1 is provided with a windward side and a leeward side, the leeward side is positioned at the downstream of the windward side in the flowing direction of the airflow, and the windward side is positioned at the upstream of the leeward side. The wind wheel drives the air current to flow to the air outlet from the air inlet, and the heat exchanger assembly 100 is arranged at the upstream of the wind wheel, so that the side of the main heat exchanger 1 far away from the wind wheel is the windward side, and the side of the main heat exchanger 1 close to the wind wheel is the leeward side. The auxiliary heat exchanger 2 is arranged on the windward side of the main heat exchanger 1, so that the heat exchange capacity of the heat exchanger assembly 100 can be increased.

The auxiliary heat exchanger 2 has a fourth heat exchanging pipe 21, and the fourth heat exchanging pipe 21 may be plural. It is to be understood that the heat exchange tube of the auxiliary heat exchanger 2 may have only one tube type of the fourth heat exchange tube 21. Of course, the heat exchange tube of the auxiliary heat exchanger 2 may also comprise other tube types, which is not limited herein.

As shown in fig. 1, lower end portions of the lower heat exchanging part 112 and the upper heat exchanging part 111 are configured as a first region 115, the remaining portion of the upper heat exchanging part 111 is configured as a second region 116, and the first region 115 and the second region 116 each include first and second

heat exchanging pipes

113 and 114. That is, the front heat exchanger 11 is divided into two regions, the entire region of the lower heat exchanging part 112 and the lower region of the upper heat exchanging part 111 belong to the first region 115, and the upper region of the upper heat exchanging part 111 belongs to the second region 116.

The heat exchange flow path of the heat exchanger assembly 100 includes a first flow path 3, a second flow path 4 and a third flow path 5, the first flow path 3 flows through the fourth heat exchange tube 21 of the auxiliary heat exchanger 2, the second flow path 4 includes a first branch 41, a second branch 42, a third branch 43 and a fourth branch 44 which are connected in parallel, all third heat exchange tubes 121 of the rear heat exchanger 12 and all first heat exchange tubes 113 and all second heat exchange tubes 114 of the second area 116 are formed by the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44, the third flow path 5 flows through all first heat exchange tubes 113 and all second heat exchange tubes 114 of the first area 115, and when the heat exchanger assembly 100 is used for refrigeration, a refrigerant sequentially flows through the first flow path 3, the second flow path 4 and the third flow path 5.

It can be understood that when the heat exchanger assembly 100 is used for cooling, the refrigerant flows from the fourth heat exchange tube 21 of the auxiliary heat exchanger 2 to the first heat exchange tube 113, the second heat exchange tube 114 and the third heat exchange tube 121 of the main heat exchanger 1. According to the arrangement of the wind field, the air flow at the position close to the air inlet is faster, the air flow is relatively slower at the position far away from the air inlet, and when the temperature difference between the refrigerant and the air flow at the position where the air flow is faster is larger than that at the position where the air flow is slower, the heat exchange efficiency of the heat exchanger assembly 100 is better. Therefore, when the heat exchanger assembly 100 is used for refrigeration, the part of the heat exchanger assembly 100 close to the air inlet flows to the part far away from the heat exchanger assembly 100, so that the heat exchange energy efficiency of the heat exchanger assembly 100 is better, and when the heat exchanger assembly 100 is used for refrigeration, the refrigerant flows to the first heat exchange tube 113, the second heat exchange tube 114 and the third heat exchange tube 121 of the main heat exchanger 1 from the fourth heat exchange tube 21 of the auxiliary heat exchanger 2, so that the heat exchange energy efficiency of the heat exchanger assembly 100 is better.

In addition, in the present application, according to the refrigerant flow characteristics, the pressure drop loss is large during cooling, and the second flow path 4 includes four branches connected in parallel, i.e., the first branch 41, the second branch 42, the third branch 43, and the fourth branch 44, so that the flow velocity and the pressure loss of the branches can be reduced, and thus the heat exchange efficiency and the heat exchange performance of the heat exchanger assembly 100 can be improved.

The fourth heat exchange tube 21 of the auxiliary heat exchanger 2 participates in heat exchange when the heat exchanger assembly 100 is refrigerated, and becomes an extension section of a supercooling section when the heat exchanger assembly 100 is heated, so that energy-saving efficiency can be effectively improved.

Referring to table 1, the second flow path 4 is divided into four paths and three paths for comparison, and the four paths are more energy efficient.

TABLE 1

Flow path	APF(JISC9612：2005)
		Divide into 3 routes	5.56
Divided into 4 paths	5.67

According to the heat exchanger assembly 100 of the embodiment of the present invention, by providing the auxiliary heat exchanger 2 at the windward side of the main heat exchanger 1, providing the first heat exchange tube 113 and the second heat exchange tube 114 in the front heat exchanger 11, providing the third heat exchange tube 121 in the rear heat exchanger 12, providing the fourth heat exchange tube 21 in the auxiliary heat exchanger 2, and making the heat exchange flow path of the heat exchanger include the first flow path 3, the second flow path 4, and the third flow path 5, the first flow path 3 flows through the fourth heat exchange tube 21 of the auxiliary heat exchanger 2, the second flow path 4 includes the first branch 41, the second branch 42, the third branch 43, and the fourth branch 44 connected in parallel, the first branch 41 to the fourth branch 44 constitutes all the third heat exchange tubes 121 of the rear heat exchanger 12 and all the first heat exchange tubes 113 and the second heat exchange tubes 114 of the second area 116, the third flow path 5 flows through all the first heat exchange tubes 113 and the second heat exchange tubes 114 of the first area 115, when the heat exchanger assembly 100 is used for cooling, a refrigerant flows through the first flow path 3, the second flow path 4 and the third flow path 5 in sequence, so that the heat exchange energy efficiency of the heat exchanger assembly 100 can be improved.

During heating, the refrigerant flows through the small-diameter pipeline and then flows through the large-diameter pipeline, and the energy efficiency is higher than that of the refrigerant which flows through the large-diameter pipeline and then flows through the small-diameter pipeline; on the contrary, during refrigeration, the refrigerant flows into the small-diameter pipeline after flowing through the large-diameter pipeline, the energy efficiency is higher than that of the refrigerant flowing through the large-diameter pipeline after flowing through the small-diameter pipeline, the pipe diameter is gradually reduced in the process that the refrigerant is in a gas state to a liquid state, and the contact heat exchange area between the refrigerant and the wall surface of the heat exchange pipe is increased.

Therefore, in some embodiments of the present invention, the pipe diameter of the fourth heat exchange pipe 21 is larger than that of the third heat exchange pipe 121, the pipe diameter of the third heat exchange pipe 121 is equal to that of the second heat exchange pipe 114, and the pipe diameter of the second heat exchange pipe 114 is larger than that of the first heat exchange pipe 113. When the heat exchanger assembly 100 refrigerates, the refrigerant flows through the first flow path 3, the second flow path 4 and the third flow path 5 in sequence, and when the heat exchanger assembly 100 refrigerates, the refrigerant flows through the large-diameter pipeline and then flows into the small-diameter pipeline in the flowing process, so that the heat exchange efficiency of the heat exchanger assembly 100 is better. Correspondingly, when the heat exchanger assembly 100 heats, the refrigerant flows through the third flow path 5, the second flow path 4 and the first flow path 3 in sequence, and when the heat exchanger assembly 100 heats, the refrigerant flows through the small-diameter pipeline and then flows into the large-diameter pipeline in the flowing process, so that the heating performance can be effectively improved, and the heat exchange efficiency of the heat exchanger assembly 100 is better.

In addition, the material of the heat exchange tube can be reduced by adopting the heat exchange tube with the small tube diameter, so that the overall cost of the heat exchanger assembly 100 is obviously reduced, but when a refrigerant passes through the heat exchange tube with the small tube diameter, the heat exchange resistance is large, the pressure loss is large, the refrigerant circulation is not facilitated, and the cost and the refrigerant circulation flow efficiency of the heat exchanger assembly 100 need to be comprehensively considered. Therefore, the first heat exchange tube 113 and the second heat exchange tube 114 are arranged in the front heat exchanger 11, the third heat exchange tube 121 is arranged in the rear heat exchanger 12, the fourth heat exchange tube 21 is arranged in the auxiliary heat exchanger 2, the tube diameter of the fourth heat exchange tube 21 is larger than that of the third heat exchange tube 121, the tube diameter of the third heat exchange tube 121 is equal to that of the second heat exchange tube 114, the tube diameter of the second heat exchange tube 114 is larger than that of the first heat exchange tube 113, and the production cost of the heat exchanger assembly 100 can be reduced while the heat exchange energy efficiency of the heat exchanger assembly 100 is guaranteed to be better.

In some embodiments of the present invention, the second heat exchange tube 114 is located at the leeward side of the first heat exchange tube 113 in the first region 115, thereby facilitating the arrangement of the refrigerant flow path and the temperature equalization of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44. In the second region 116, the second heat exchanging pipe 114 is located on the windward side of the first heat exchanging pipe 113. Therefore, the second heat exchange tube 114 with a larger tube diameter on the windward side can exchange heat with airflow better, and the heat exchange energy efficiency of the heat exchanger assembly 100 is improved.

As shown in fig. 1, each of the first and

second regions

115 and 116 has three rows of heat exchange tubes, the first region 115 includes two rows of first heat exchange tubes 113 on the windward side and one row of second heat exchange tubes 114 on the leeward side, and the second region 116 includes two rows of second heat exchange tubes 114 on the windward side and one row of first heat exchange tubes 113 on the leeward side. It is understood that the first region 115 has three rows of heat exchange tubes, one row of the first heat exchange tubes 113, and one row of the second heat exchange tubes 114 in the windward-to-leeward direction, and the second region 116 has three rows of heat exchange tubes, one row of the second heat exchange tubes 114, and one row of the first heat exchange tubes 113 in the windward-to-leeward direction. Therefore, the arrangement of the heat exchange tubes is facilitated, the arrangement of a refrigerant flow path is facilitated, and the energy efficiency of the air conditioner can be improved.

In some embodiments of the present invention, as shown in FIG. 2, the first leg 41 flows through a portion of the third heat exchange tube 121 of the rear heat exchanger 12 and all of the first heat exchange tube 113 of the second section 116, the second leg 42 flows through a portion of the third heat exchange tube 121 of the rear heat exchanger 12 and a portion of the second heat exchange tube 114 of the second section 116, the third leg 43 flows through a portion of the third heat exchange tube 121 of the rear heat exchanger 12 and the remaining portion of the second heat exchange tube 114 of the second section 116, and the fourth leg 44 flows through the remaining portion of the third heat exchange tube 121 of the rear heat exchanger 12. Therefore, the temperatures of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 can be equally divided, the flow speed and the pressure loss of the branches are reduced, the design is carried out on the basis that the temperature difference at a heating outlet is smaller than 2 degrees according to the heat exchange of different pipe diameters and different area heat exchange coefficients, the heat exchange performance during heating is integrally improved, meanwhile, the wind field distribution is considered, the cross shunting mode is adopted, the temperature difference before the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 are gathered under the rated refrigeration working condition is smaller than 0.5 ℃, the heat exchange uniformity of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 is ensured, and the refrigeration heat exchange performance is improved.

In some embodiments of the present invention, the first branch 41 to the fourth branch 44 each flow from the inlet side of the second zone 116 or the rear heat exchanger 12 to the outlet side of the second zone 116 or the rear heat exchanger 12. Therefore, the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 can avoid the possibility that all heat exchange tubes on the windward side of the rear heat exchanger 12 and the second area 116 need to flow to the leeward side heat exchange tubes of the rear heat exchanger 12 and the second area 116, reduce the possibility that the refrigerant flow direction of the refrigerant in the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 needs to be changed for all the heat exchange tubes on the windward side of the rear heat exchanger 12 and the second area 116 to flow, and simplify the flow path design of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44. Meanwhile, the rear heat exchanger 12 and the second area 116 are from the windward side to the leeward side, the temperatures of the refrigerants at each position on the same straight line in the length direction of the rear heat exchanger 12 and the second area 116 are approximately the same, and the temperatures of the refrigerants are matched with the approximately same airflow velocity at the same straight line, so that the heat exchange energy efficiency of the heat exchanger assembly 100 can be further improved. Accordingly, as the heat exchanger assembly 100 heats, it flows from the leeward side to the windward side of the rear heat exchanger 12 and the second region 116.

Specifically, in the example shown in fig. 1 and 2, the first branch 41 includes a first sub-branch and a second sub-branch, the first sub-branch flows through a part of the third heat exchange tubes 121 of the rear heat exchanger 12, the second sub-branch flows through all the first heat exchange tubes 113 of the second area 116, and when the heat exchanger assembly 100 is used for cooling, the refrigerant flows through the first sub-branch and the second sub-branch in sequence. It can be understood that, when the heat exchanger assembly 100 is used for cooling, the refrigerant flows through the third heat exchange tube 121 of the rear heat exchanger 12 on the first branch 41 and then flows to the first heat exchange tube 113 of the second area 116.

The second branch 42 includes a third sub-branch, a fourth sub-branch and a fifth sub-branch, the third sub-branch flows through a part of the third heat exchange tubes 121 of the rear heat exchanger 12, the fourth sub-branch flows through a part of the second heat exchange tubes 114 of the second area 116, the fifth sub-branch flows through a part of the third heat exchange tubes 121 of the rear heat exchanger 12, and when the heat exchanger assembly 100 is used for refrigeration, a refrigerant sequentially flows through the third sub-branch, the fourth sub-branch and the fifth sub-branch. It will be appreciated that during cooling of the heat exchanger assembly 100, the refrigerant flows through the third heat exchange tube 121 of the rear heat exchanger 12, then flows to the second heat exchange tube 114 of the second region 116, and then flows to the third heat exchange tube 121 of the rear heat exchanger 12 on the second branch 42.

The third branch 43 includes a sixth sub-branch and a seventh sub-branch, the sixth sub-branch flows through a part of the third heat exchange tubes 121 of the rear heat exchanger 12, the seventh sub-branch flows through the other part of the second heat exchange tubes 114 of the second area 116, and when the heat exchanger assembly 100 is used for refrigeration, the refrigerant flows through the seventh sub-branch and the sixth sub-branch in sequence. It will be appreciated that during cooling of the heat exchanger assembly 100, the refrigerant flows through the third heat exchange tube 121 of the subsequent heat exchanger 12 on the second branch 42 and then flows to the second heat exchange tube 114 of the second region 116.

Further, as shown in fig. 1, each of the rear heat exchanger 12 and the front heat exchanger 11 includes three rows of heat exchange tubes, each of the three rows of heat exchange tubes of the rear heat exchanger 12 is a third heat exchange tube 121, the heat exchange tubes of the second region 116 of the front heat exchanger 11 are a first heat exchange tube 113 and a second heat exchange tube 114, two rows of heat exchange tubes of the second region 116 close to the windward side of the front heat exchanger 11 are a second heat exchange tube 114, and one row of heat exchange tubes close to the leeward side of the front heat exchanger 11 are a first heat exchange tube 113.

As shown in fig. 1, two rows of heat exchange tubes of the second area 116 near the windward side of the front heat exchanger 11 each have two second heat exchange tubes 114, and one row of heat exchange tubes near the leeward side of the front heat exchanger 11 has two first heat exchange tubes 113. The third heat exchange tubes 121 of the rear heat exchanger 12 include a windward heat exchange tube array, a middle heat exchange tube array and a leeward heat exchange tube array, and it can be understood that the windward heat exchange tube array, the middle heat exchange tube array and the leeward heat exchange tube array are sequentially arranged in the direction of the airflow. For example, in the example shown in fig. 1, the rear heat exchanger 12 includes three rows of heat exchange tubes, a windward row of heat exchange tubes being located on the windward side of the rear heat exchanger 12, a leeward row of heat exchange tubes being located on the leeward side of the rear heat exchanger 12, and a middle row of heat exchange tubes being located between the windward and leeward rows of heat exchange tubes.

In the example shown in fig. 1, the front heat exchanger 12 has four third heat exchange tubes 121 in the windward row, four third heat exchange tubes 121 in the middle row, and four third heat exchange tubes 121 in the leeward row, and the rear heat exchanger 12 has one third heat exchange tube 121 spanning between the middle row and the leeward row. When the heat exchanger assembly 100 is used for refrigeration, the first branch 41 flows through one third heat exchange tube 121 far away from the front heat exchanger 11 in the leeward heat exchange tubes of the rear heat exchanger 12, then flows to one third heat exchange tube 121 close to the front heat exchanger 11 in the middle heat exchange tube row, and then flows to two first heat exchange tubes 113 in one row on the leeward side of the second region 116; the second branch 42 flows through the middle two third heat exchange tubes 121 in the windward row of heat exchange tubes of the rear heat exchanger 12, flows to the middle two second heat exchange tubes 114 in the second area 116, and then flows to one third heat exchange tube 121 close to the front heat exchanger 11 in the leeward row of heat exchange tubes of the rear heat exchanger 12; the third branch 43 flows through two second heat exchange tubes 114 arranged in the windward direction in the second region 116, flows to a third heat exchange tube 121 far away from the front heat exchanger 11 in the middle row of heat exchange tubes in the rear heat exchanger 12, then flows to a third heat exchange tube 121 in the transverse middle row and the leeward row in the rear heat exchanger 12, and then flows to a third heat exchange tube 121 far away from the front heat exchanger 11 in the leeward row of heat exchange tubes in the rear heat exchanger 12; the fourth branch 44 flows through one third heat exchange tube 121 on the windward row of heat exchange tubes of the rear heat exchanger 12 close to the front heat exchanger 11, then flows to the middle two third heat exchange tubes 121 in the middle row of heat exchange tubes of the rear heat exchanger 12, and then flows to the middle two third heat exchange tubes 121 in the leeward row of heat exchange tubes of the rear heat exchanger 12.

It can be seen that the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 all flow from the windward row to the leeward row in the whole formed by the rear heat exchanger 12 and the second region 116, so that the heat exchange energy efficiency of the heat exchanger assembly 100 can be improved.

The first branch 41 flows through four heat exchange tubes, including two third heat exchange tubes 121 with a larger tube diameter and two first heat exchange tubes 113 with a smaller tube diameter, the second branch 42, the third branch 43 and the fourth branch 44 flow through five heat exchange tubes, and the tube diameters of the five heat exchange tubes through which the second branch 42, the third branch 43 and the fourth branch 44 flow are the same as the tube diameter of the heat exchange tube with a larger tube diameter in the first branch 41, so that the heat exchange effects of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 are basically the same.

In addition, the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 take wind field distribution into consideration, and a cross-flow dividing mode is adopted, so that the temperature difference before the two branches are gathered under a rated refrigeration working condition is less than 0.5 ℃, the heat exchange uniformity of the two branches is ensured, and the refrigeration heat exchange performance is improved.

The first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 may be connected by a distributor, and the inlet end and the outlet end of the first branch 41, the second branch 42, the third branch 43 and the fourth branch 44 are respectively connected by a distributor.

In some embodiments of the present invention, as shown in fig. 2, the third flow path 5 takes into account the refrigerant flow loss during cooling, and adopts a form of dividing into 6 paths, and increasing the branch path reduces the pressure loss. Specifically, the third flow path 5 includes a sixth branch 51, a seventh branch 52, an eighth branch 53, a ninth branch 54, a tenth branch 55 and an eleventh branch 56, and the sixth branch 51 to the eleventh branch 56 form all the first heat exchange tubes 113 and the second heat exchange tubes 114 of the first region 115. Since the refrigerant flowing out of the four branches of the second flow path 4 and collected is divided into 6 paths and the heat exchange efficiency of the heat exchanger assembly 100 is the best, the third flow path 5 is divided into six paths, that is, a sixth path 51, a seventh path 52, an eighth path 53, a ninth path 54, a tenth path 55 and an eleventh path 56, so that the energy efficiency of the heat exchanger is improved. And the branch circuits are relatively more, and the pressure loss is less.

Further, as shown in fig. 2, when the heat exchanger assembly 100 cools, the refrigerant in each of the sixth, seventh, eighth, ninth, tenth and

eleventh branches

51, 52, 53, 54, 55 and 56 flows from the first heat exchange tube 113 to the second heat exchange tube 114. It will be appreciated that each of the sixth, seventh, eighth, ninth, tenth and

eleventh legs

51, 52, 53, 54, 55 and 56 flow from the windward side to the leeward side of the first region 115.

Therefore, the sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55 and the eleventh branch 56 can avoid the possibility that all heat exchange tubes on the windward side of the front heat exchanger 11 need to flow to the leeward side heat exchange tubes of the front heat exchanger 11, reduce the possibility that the refrigerant flow direction of the refrigerant in the sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55 and the eleventh branch 56 needs to be changed in order to flow to all the heat exchange tubes on the windward side of the front heat exchanger 11, and simplify the flow path design of the sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55 and the eleventh branch 56. Meanwhile, the temperature of each refrigerant at each position on the same straight line of the length direction of the front heat exchanger 11 is approximately the same from the windward side to the leeward side, and the air flow velocity approximately the same at the same straight line is matched, so that the heat exchange efficiency of the heat exchanger assembly 100 can be further improved. In addition, a branch is added to reduce pressure loss by adopting a branch form, and according to air quantity attenuation, a heat exchange tube with a larger tube diameter is arranged on the lee side, a heat exchange tube with a smaller tube diameter is arranged on the windward side, so that the pressure loss of the inner row is reduced, and the heat exchange performance is improved.

Accordingly, when the heat exchanger assembly 100 heats, the refrigerant in each of the sixth, seventh, eighth, ninth, tenth and

eleventh branches

51, 52, 53, 54, 55 and 56 flows from the second heat exchange tube 114 to the first heat exchange tube 113, and flows from the leeward side to the windward side of the first region 115 of the front heat exchanger 11. It can be understood that, when the heat exchanger assembly 100 heats, the refrigerants entering the sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55 and the eleventh branch 56 are in a gaseous state, the gaseous refrigerant is changed into a liquid refrigerant through heat dissipation, the gaseous refrigerant has a large volume, and the second heat exchange tube 114 having a large relative tube diameter enters the second heat exchange tube 114, so that the pressure loss caused by an excessively large flow velocity of the refrigerant can be avoided. In addition, during heating, the refrigerant firstly enters the large pipe diameter and then enters the small pipe diameter, and the refrigerant directly enters the small pipe diameter, so that the energy efficiency is high. Therefore, when the heat exchanger assembly 100 heats, the refrigerant in each of the sixth, seventh, eighth, ninth, tenth and

eleventh branches

51, 52, 53, 54, 55 and 56 flows from the second heat exchange tube 114 to the first heat exchange tube 113, and flows from the leeward side to the windward side of the first region 115 of the front heat exchanger 11, which is energy efficient.

Further, as shown in fig. 2, the number of heat exchange tubes in each of the sixth, seventh, eighth, ninth, tenth and

eleventh branches

51, 52, 53, 54, 55 and 56 is the same, and the number of first heat exchange tubes 113 and the number of second heat exchange tubes 114 are the same for each branch. Specifically, in the example shown in fig. 2, the number of the first heat exchange tubes 113 in each of the sixth, seventh, eighth, ninth, tenth and

eleventh branches

51, 52, 53, 54, 55 and 56 is two, and the number of the second heat exchange tubes 114 is one. This can improve the heat exchange efficiency of the heat exchanger assembly 100, and can simplify the flow path design of the sixth, seventh, eighth, ninth, tenth, and

eleventh branches

51, 52, 53, 54, 55, and 56.

The sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55, the eleventh branch 56 in the fourth flow path and the second flow path 4 may be connected by a distributor, and the refrigerant flowing out of the second flow path 4 may simultaneously enter the sixth branch 51, the seventh branch 52, the eighth branch 53, the ninth branch 54, the tenth branch 55, and the eleventh branch 56 of the third flow path 5, respectively.

In some embodiments of the present invention, as shown in fig. 1, the auxiliary heat exchanger 2 includes a first auxiliary heat exchanger 22 and a second auxiliary heat exchanger 23, the first auxiliary heat exchanger 22 is located on the windward side of the rear heat exchanger 12, the second auxiliary heat exchanger 23 is located on the windward side of the upper heat exchanging portion 111, and each of the first auxiliary heat exchanger 22 and the second auxiliary heat exchanger 23 includes a fourth heat exchanging pipe 21. Because the rear heat exchanger 12 and the upper heat exchanger are close to the air inlet, the airflow velocity is larger at the position, and the requirement on the temperature difference between the refrigerant and the airflow is higher, the first auxiliary heat exchanger 22 is arranged on the windward side of the rear heat exchanger 12, and the second auxiliary heat exchanger 23 is arranged on the windward side of the upper heat exchanger, so that the energy efficiency of the heat exchanger assembly 100 is better, and particularly, higher heating efficiency can be realized.

Further, as shown in fig. 2, the first flow path 3 includes a first main path 31, a twelfth branch path 32 and a thirteenth branch path 33, the first main path 31 flows through a part of the fourth heat exchange tubes 21 of the second auxiliary heat exchanger 23, the twelfth branch path 32 flows through a part of the fourth heat exchange tubes 21 of the second auxiliary heat exchanger 23 and a part of the fourth heat exchange tubes 21 of the first auxiliary heat exchanger 22, the thirteenth branch path 33 flows through the remaining part of the fourth heat exchange tubes 21 of the second auxiliary heat exchanger 23 and the remaining part of the fourth heat exchange tubes 21 of the first auxiliary heat exchanger 22, and when the heat exchanger assembly 100 performs refrigeration, the refrigerant flows through the first main path 31 and then flows to the twelfth branch path 32 and the thirteenth branch path 33 simultaneously. Thereby, the heat exchange energy efficiency can be improved.

For example, in the example shown in fig. 2, the first auxiliary heat exchanger 22 has two fourth heat exchange tubes 21, the second auxiliary heat exchanger 23 has three fourth heat exchange tubes 21, the first main path 31 flows through one fourth heat exchange tube 21 of the second auxiliary heat exchanger 23, and the twelfth and thirteenth branches 32 and 33 flow through one fourth heat exchange tube 21 of the second auxiliary heat exchanger 23 and one fourth heat exchange tube 21 of the first auxiliary heat exchanger 22, respectively.

In some embodiments of the present invention, the pipe diameter of the fourth heat exchange pipe 21 is 7mm, the pipe diameters of the third heat exchange pipe 121 and the second heat exchange pipe 114 are 6.35mm, and the pipe diameter of the first heat exchange pipe 113 is 5 mm. It can be understood that the heat exchange tubes with the tube diameters of 7mm, 6.35mm and 5mm are widely used in the prior art, so that the heat exchange tubes with the three tube diameters are favorable for reducing the difficulty in obtaining the heat exchange tubes, and the manufacturing cost of the heat exchanger assembly 100 can be reduced while the heat exchange energy efficiency of the heat exchanger assembly 100 is ensured.

In some embodiments of the present invention, the number of heat exchange tubes of the heat exchanger assembly 100 is 42 or more. This enables the heat exchanger assembly 100 to be more energy efficient for heat exchange.

In some embodiments of the present invention, the number of heat exchange tubes of the rear heat exchanger 12 and the front heat exchanger 11 is at least three.

The heat exchanger assembly 100 of the present invention may be applied to a high capacity segment model (6.3-8.0 kW).

An air conditioning indoor unit according to an embodiment of the present invention includes a casing, a wind wheel, and the heat exchanger assembly 100 described above.

Specifically, the housing has an air inlet and an air outlet, the wind wheel is disposed in the housing to drive the airflow from the air inlet to the air outlet, and the heat exchanger assembly 100 is disposed in the housing and located on the air inlet side of the wind wheel.

According to the air conditioning indoor unit of the embodiment of the present invention, by providing the above-described heat exchanger assembly 100, by providing the auxiliary heat exchanger 2 at the windward side of the main heat exchanger 1, providing the first heat exchanging tube 113 and the second heat exchanging tube 114 in the front heat exchanger 11, providing the third heat exchanging tube 121 in the rear heat exchanger 12, providing the fourth heat exchanging tube 21 in the auxiliary heat exchanger 2, and making the heat exchanging flow paths of the heat exchangers include the first flow path 3, the second flow path 4, and the third flow path 5, the first flow path 3 flowing through the fourth heat exchanging tube 21 of the auxiliary heat exchanger 2, the second flow path 4 including the first branch 41, the second branch 42, the third branch 43, and the fourth branch 44 connected in parallel, the first branch 41 to the fourth branch 44 constituting all the third heat exchanging tubes 121 of the rear heat exchanger 12 and all the first heat exchanging tubes 113 and the second heat exchanging tubes 114 of the second zone 116, the third flow path 5 flowing through all the first heat exchanging tubes 113 and the second heat exchanging tubes 114 of the first zone 115, when the heat exchanger assembly 100 is used for cooling, a refrigerant flows through the first flow path 3, the second flow path 4 and the third flow path 5 in sequence, so that the heat exchange energy efficiency of the heat exchanger assembly 100 can be improved.

In some embodiments of the utility model, the wind wheel is a cross-flow wind wheel, and the diameter of the cross-flow wind wheel is 120-130 mm.

Further, the angle between the rear heat exchanger 12 and the vertical direction is less than 48 degrees, and when the heat exchanger assembly 100 is applied to an indoor unit of an air conditioner, the rear heat exchanger 12 is made to surround the wind wheel in a semi-circle manner, so that the heat exchange energy efficiency of the heat exchanger assembly 100 can be further improved, and meanwhile, the condensation generated on the rear heat exchanger 12 can flow down along the rear heat exchanger 12.

Further, the distance between the main heat exchanger 1 and the wind wheel is more than 10mm, so that the air flow can be driven away by the wind wheel after fully exchanging heat with the main heat exchanger 1, and the possibility of collision between the air flow and the main heat exchanger 1 during operation can be reduced.

Further, the width dimension of the casing in the front-rear direction is 800mm or less, and the height dimension of the casing in the up-down direction is 300mm or less, whereby the size of the air conditioning indoor unit can be made more appropriate, and the overall size of the air conditioning indoor unit can be reduced.

In some embodiments of the present invention, an included angle is formed between the upper heat exchanging portion 111 and the lower heat exchanging portion 112 of the front heat exchanger 11, and the front heat exchanger 11 is relatively protruded away from the wind wheel. Referring to table 2, the heat exchanger assembly 100 of the present application is energy efficient relative to conventional tri-fold heat exchangers.

TABLE 2

Testing conditions and APF (80 machines for example)	Traditional three-fold heat exchanger	The utility model
			Rated refrigeration	3.05	3.15
Intermediate refrigeration	5.75	5.85
			Rated heating	3.98	4.12
Intermediate heating	5.95	6.12
			APF(JISC9612:2005)	5.45	5.67

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat exchanger assembly, comprising:

the heat exchanger comprises a main heat exchanger and a heat exchanger body, wherein the main heat exchanger comprises a front heat exchanger and a rear heat exchanger, the front heat exchanger comprises an upper heat exchange part and a lower heat exchange part, the upper end of the upper heat exchange part is connected with the upper end of the rear heat exchanger, the upper end of the lower heat exchange part is integrally connected with the lower end of the upper heat exchange part, the front heat exchanger comprises a first heat exchange tube and a second heat exchange tube, and the rear heat exchanger comprises a third heat exchange tube;

the auxiliary heat exchanger is arranged on the windward side of the main heat exchanger and is provided with a fourth heat exchange tube;

lower end portions of the lower and upper heat exchange portions are configured as a first region, and the remaining portion of the upper heat exchange portion is configured as a second region, the first and second regions each including the first and second heat exchange tubes, the heat exchange flow path of the heat exchanger assembly including a first flow path flowing through the fourth heat exchange tube of the auxiliary heat exchanger, a second flow path including a first, second, third and fourth branch circuits connected in parallel, the first to fourth branch circuits constituting all of the third and second heat exchange tubes of the rear heat exchanger and all of the first and second heat exchange tubes of the second region, and a third flow path flowing through all of the first and second heat exchange tubes of the first region,

when the heat exchanger assembly is used for refrigerating, a refrigerant sequentially flows through the first flow path, the second flow path and the third flow path.

2. The heat exchanger assembly of claim 1, wherein the fourth heat exchange tube has a tube diameter greater than the third heat exchange tube, the third heat exchange tube has a tube diameter equal to the second heat exchange tube, and the second heat exchange tube has a tube diameter greater than the first heat exchange tube.

3. The heat exchanger assembly of claim 2, wherein in the first region the second heat exchange tube is on a leeward side of the first heat exchange tube and in the second region the second heat exchange tube is on a windward side of the first heat exchange tube.

4. The heat exchanger assembly of claim 3, wherein the first leg flows through a portion of the third heat exchange tube of the rear heat exchanger and all of the first heat exchange tube of the second zone, the second leg flows through a portion of the third heat exchange tube of the rear heat exchanger and all of the second heat exchange tube of the second zone, the third leg flows through a portion of the third heat exchange tube of the rear heat exchanger and the remaining portion of the second heat exchange tube of the second zone, and the fourth leg flows through the remaining portion of the third heat exchange tube of the rear heat exchanger.

5. The heat exchanger assembly of claim 4, wherein the first leg through the fourth leg each flow from the air intake side of the second zone or the rear heat exchanger to the leeward side of the second zone or the rear heat exchanger.

6. The heat exchanger assembly of claim 3, wherein the third flow path comprises a sixth leg, a seventh leg, an eighth leg, a ninth leg, a tenth leg, and an eleventh leg, the sixth leg through the eleventh leg comprising all of the first heat exchange tube and the second heat exchange tube of the first zone.

7. The heat exchanger assembly as claimed in claim 6, wherein the refrigerant in each of the sixth to eleventh branches flows from the first heat exchange tube to the second heat exchange tube when the heat exchanger assembly is refrigerating.

8. The heat exchanger assembly of claim 1, wherein the auxiliary heat exchanger comprises a first auxiliary heat exchanger and a second auxiliary heat exchanger, the first auxiliary heat exchanger being located upwind of the rear heat exchanger, the second auxiliary heat exchanger being located upwind of the upper heat exchange portion.

9. The heat exchanger assembly of claim 8, wherein the first flow path includes a first main path and a twelfth path and a thirteenth path, the first main path flows through a portion of the fourth heat exchange tubes of the second auxiliary heat exchanger, the twelfth path flows through a portion of the fourth heat exchange tubes of the second auxiliary heat exchanger and a portion of the fourth heat exchange tubes of the first auxiliary heat exchanger, the thirteenth path flows through the remaining portion of the fourth heat exchange tubes of the second auxiliary heat exchanger and the remaining portion of the fourth heat exchange tubes of the first auxiliary heat exchanger, and when the heat exchanger assembly is used for refrigeration, the refrigerant flows through the first main path and then flows to the twelfth path and the thirteenth path simultaneously.

10. The heat exchanger assembly of claim 2, wherein the fourth heat exchange tube has a tube diameter of 7mm, the third heat exchange tube and the second heat exchange tube have a tube diameter of 6.35mm, and the first heat exchange tube has a tube diameter of 5 mm.

11. An indoor unit of an air conditioner, comprising the heat exchanger assembly as recited in any one of claims 1 to 10.