WO2020047926A1 - Heat exchanger assembly and indoor unit of air conditioner - Google Patents

Abstract

Disclosed in the present application are a heat exchanger assembly and an indoor unit of an air conditioner. The heat exchanger assembly comprises: a body heat exchanger comprising a front heat exchanger, a middle heat exchanger and a rear heat exchanger, the front heat exchanger, the middle heat exchanger and the rear heat exchanger being all provided with at least three rows of heat exchange tubes, and the number of the heat exchange tubes of the middle heat exchanger being greater than that of the front heat exchanger and that of the rear heat exchanger; and a back pipe heat exchanger. A heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch, a third branch and a fourth branch after passing through the back pipe heat exchanger. The first branch flows through the heat exchange tubes of the front heat exchanger, the second branch and the third branch flow through the heat exchange tubes of the middle heat exchanger, the fourth branch flows through the heat exchange tubes of the rear heat exchanger, and at least one of the first branch and the fourth branch is disposed across the heat exchange tubes of the middle heat exchanger.

Description

Heat exchanger assembly and air conditioner indoor unit Ranch

Technical field

The present application relates to the technical field of air-conditioning products, and in particular, to a heat exchanger assembly and an air-conditioning indoor unit.

Background technique

With the continuous improvement of energy efficiency standards for air conditioners at home and abroad, how to improve the heat exchange efficiency of air conditioner heat exchangers has become an urgent problem. Among the many solutions, use a heat exchanger with high heat exchange efficiency in the newly designed air conditioner or use a heat exchanger with high heat exchange efficiency to perform heat exchangers with low heat exchange performance for mass-produced air conditioners. Replacement is a more effective way.

Existing air-conditioning heat exchangers with good heat exchange performance generally include a front heat exchanger, a middle heat exchanger, and a rear heat exchanger. The three are semi-enclosed. When the air-conditioning heat exchanger is in a refrigeration mode, the refrigerant is supplied by The four-way pipe is divided into four paths, two of which enter the middle heat exchanger and the other two enter the front heat exchanger and the rear heat exchanger respectively for heat exchange. However, due to the front heat exchanger, the middle heat exchanger and the rear heat exchanger, The heat exchanger is limited by the rectangular space in the air conditioner casing. Therefore, their respective sizes are also different, so that the number of heat exchange tubes that can be installed in each heat exchanger is also different, and the size of the heat exchanger is often medium. It is twice or more than that of the front heat exchanger or the rear heat exchanger. Accordingly, the number of heat exchange tubes arranged in the middle heat exchanger is far more than that of the front heat exchanger or the rear heat exchanger. After the refrigerant enters the front heat exchanger or the rear heat exchanger and exits the air-conditioning heat exchanger, the number of heat exchange tubes that pass through is much smaller than the number of heat exchange tubes that the refrigerant enters into the middle heat exchanger. In other words, the refrigerant is in the When heat is exchanged in the front heat exchanger or the rear heat exchanger, it is likely to occur when the heat exchange is not sufficient When the heat exchanger is discharged, the heat exchange in the middle heat exchanger may occur when the heat exchange is still sufficient, but still continues to flow through the heat exchange tubes. In summary, this flow path design makes the air conditioner heat exchanger The uneven heat exchange reduces the energy efficiency of the air-conditioning heat exchanger.

Application content

The main purpose of this application is to propose a heat exchanger assembly, which aims to improve the heat exchange balance between the middle heat exchanger, the front heat exchanger and the rear heat exchanger of the air conditioner heat exchanger in the prior art, and improve the heat exchange of the air conditioner Energy efficiency.

In order to achieve the above object, the heat exchanger assembly proposed in this application includes:

The main heat exchanger is arranged in a semi-enclosed shape. The main heat exchanger includes a front heat exchanger, a middle heat exchanger, and a rear heat exchanger. The front heat exchanger, the middle heat exchanger, and the rear heat exchanger are in At least three rows of heat exchange tubes are arranged in the air inlet direction, and the number of heat exchange tubes of the middle heat exchanger is greater than that of the front heat exchanger and the rear heat exchanger; and

The back-pipe heat exchanger is installed on the windward side of the main body heat exchanger;

When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch, a third branch, and a fourth branch after passing through the back-tube heat exchanger. The first branch, the second branch, the third branch, and the fourth branch all flow from the heat exchange tube on the windward side to the heat exchange tube on the leeward side of the main heat exchanger; The branch flows through the heat exchange tubes of the front heat exchanger, the second branch and the third branch flow through the heat exchange tubes of the middle heat exchanger, and the fourth branch flows through the rear The heat exchange tubes of the heat exchanger, and at least one of the first branch and the fourth branch is also disposed across the heat exchange tubes of the middle heat exchanger.

Optionally, the two-to-two difference between the number of heat exchange tubes flowing through the first branch, the second branch, the third branch, and the fourth branch is less than or equal to three.

Optionally, the front heat exchanger, the middle heat exchanger, and the rear heat exchanger are all provided with three rows of heat exchange tubes, and the total number of heat exchange tubes of the main heat exchanger is 28 to 31.

Optionally, the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger, and when the heat exchanger component is cooled, the first branch crosses the heat exchange of the middle heat exchanger. Tubes, the third branch spans the heat exchange tubes of the rear heat exchanger.

Optionally, the first branch flows through a part of the heat exchanger tubes of the intermediate heat exchanger and all the heat exchange tubes of the front heat exchanger, and the second branch flows through the intermediate heat exchanger Another part of the heat exchanger tube, the third branch and the fourth branch share the remaining heat exchanger tubes of the middle heat exchanger and all the heat exchanger tubes of the rear heat exchanger.

Optionally, the heat exchange tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchange tubes of the middle heat exchanger include a second outer row and a second middle row And a second inner row, the first outer row and the second outer row are located on the windward side of the main body heat exchanger;

When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row toward a side close to the front heat exchanger, and passes through the first span The takeover tube enters the first outer row, flows through the entire first outer row, the first middle row, and the first inner row in sequence, and flows out from the heat exchange tubes of the first inner row.

Optionally, when the heat exchanger assembly is refrigerated, the second branch flows from the second outer row, enters the second middle row, and approaches the front along the second middle row. One side of the heat exchanger flows, and then the heat exchanger tubes from the second middle row closest to the front heat exchanger are transferred into the second inner row, and along the second inner row, away from the front exchange One side of the heater flows, and then flows out from the second inner row of heat exchange tubes.

Optionally, the heat exchange tubes of the middle heat exchanger include a second outer row, a second middle row, and a second inner row, and the heat exchange tubes of the rear heat exchanger include a third outer row and a third middle row And a third inner row, the second outer row and the third outer row are located on the windward side of the main body heat exchanger;

When the heat exchanger assembly is refrigerated, the third branch flows from the second outer row and sequentially flows through the second outer row, the second middle row, and the second inner row near the rear changer. The heat exchange tube at one end of the heater enters the third inner row through the second crossover pipe, turns into the third middle row, and flows out from the heat exchange tube in the third inner row.

Optionally, when the heat exchanger assembly is cooled, the fourth branch flows from the third outer row, flows along the third outer row toward a side remote from the middle heat exchanger, and It flows through the entire third outer row, and the remaining parts of the third middle row and the third inner row in sequence, and then flows out from the heat exchange tubes of the third inner row.

Optionally, the heat exchange tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchange tubes of the middle heat exchanger include a second outer row and a second middle row And a second inner row, the heat exchange tubes of the rear heat exchanger include a third outer row, a third middle row, and a third inner row, and the first outer row, the second outer row, and the third outer row are located at On the windward side of the main heat exchanger, the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger;

When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row, and enters the first outer row through a first crossover pipe, and sequentially Flows through the first outer row, the first middle row, and the first inner row, and flows out from the heat exchange tubes of the first inner row, the second branch flows in from the second outer row, and flows in sequence Into the second middle row and the second inner row, and flow out from the heat exchange tubes of the second inner row, the third branch flows from the third middle row, and flows through the third inner row, It then enters the second middle row through a second crossover pipe, flows through the second middle row and the second inner row in sequence, and flows out through the heat exchange tubes of the second inner row. The fourth branch It flows in from the third outer row, flows through the third middle row, the third inner row in sequence, and flows out through the heat exchange tubes of the third inner row.

Optionally, the heat exchange tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchange tubes of the middle heat exchanger include a second outer row and a second middle row And a second inner row, the heat exchange tubes of the rear heat exchanger include a third outer row, a third middle row, and a third inner row, and the first outer row, the second outer row, and the third outer row are located at On the windward side of the main heat exchanger, the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger;

When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row, and enters the first outer row through a first crossover pipe, and sequentially Flows through the first outer row, the first middle row, and the first inner row, and flows out from the heat exchange tubes of the first inner row, the second branch flows in from the second outer row, and flows in sequence Into the second middle row and the second inner row, and flow out from the heat exchange tubes of the second inner row, the third branch flows from the second outer row, and flows through the second middle row in sequence And the second inner row, and then enter the third outer row through the second crossover pipe, and flow through the third outer row, the third middle row, and the third inner row in sequence, and pass through the third inner row. The heat exchange pipe flows out, the fourth branch flows from the third outer row, and then flows through the third middle row, the third inner row, and then the third crossover pipe into the second inner row and passes through. The second inner row of heat exchange tubes flows out.

Optionally, the diameter of the heat exchange tube of the back-pipe heat exchanger is larger than that of the main body heat exchanger.

Optionally, the back-tube heat exchanger is installed on the windward side of the middle heat exchanger.

Optionally, the back-pipe heat exchanger is disposed near the front heat exchanger relative to the rear heat exchanger.

Optionally, the number of heat exchange tubes of the back-pipe heat exchanger is 2 to 4.

The present application also proposes an air-conditioning indoor unit, including a heat exchanger component and a casing for accommodating the heat exchanger component; the heat exchanger component includes:

The main heat exchanger is arranged in a semi-enclosed shape. The main heat exchanger includes a front heat exchanger, a middle heat exchanger, and a rear heat exchanger. The front heat exchanger, the middle heat exchanger, and the rear heat exchanger are in At least three rows of heat exchange tubes are arranged in the air inlet direction, and the number of heat exchange tubes of the middle heat exchanger is greater than that of the front heat exchanger and the rear heat exchanger; and

The back-pipe heat exchanger is installed on the windward side of the main body heat exchanger;

When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch, a third branch, and a fourth branch after passing through the back-tube heat exchanger. The first branch, the second branch, the third branch, and the fourth branch all flow from the heat exchange tube on the windward side to the heat exchange tube on the leeward side of the main heat exchanger; The branch flows through the heat exchange tubes of the front heat exchanger, the second branch and the third branch flow through the heat exchange tubes of the middle heat exchanger, and the fourth branch flows through the rear The heat exchange tubes of the heat exchanger, and at least one of the first branch and the fourth branch is also disposed across the heat exchange tubes of the middle heat exchanger.

Optionally, the width dimension of the casing in the front-back direction is less than 800mm, and the height dimension of the casing in the vertical direction is less than 295mm.

Optionally, when the heat exchanger assembly is disposed in the casing, an included angle between an arrangement direction of the rear heat exchanger and an up-down direction is 38 ° to 48 °.

Optionally, when the heat exchanger assembly is disposed in the casing, the included angle between the arrangement direction of the middle heat exchanger and the front heat exchanger and the vertical direction is 45 ° to 55 °.

Optionally, mutually close ends of the middle heat exchanger and the rear heat exchanger abut each other; or

A gap exists between one end of the middle heat exchanger and the rear heat exchanger that are close to each other. The air conditioner indoor unit further includes a wind deflector, and the wind deflector bridges the middle heat exchanger and the rear heat exchanger. Between the windward sides of the devices near each other.

The heat exchanger assembly of the technical solution of the present application includes a main heat exchanger and a back-pipe heat exchanger provided on the windward side of the main heat exchanger. The main heat exchanger includes a front heat exchanger, a middle heat exchanger, and a rear heat exchanger. When the heat exchanger component is cooled, the heat exchange flow path after passing through the back-tube heat exchanger is divided into the first branch, the second branch, the third branch, and the fourth branch. The first branch flows through the front heat exchanger. The second branch and the third branch flow through the intermediate heat exchanger, the fourth branch flows through the rear heat exchanger, and one of the first branch and the fourth branch passes through the middle heat exchanger After the flow path is improved in this way, part of the heat exchanger tubes in the middle heat exchanger can be used for the refrigerant passing through the heat exchanger tubes of the front heat exchanger or the rear heat exchanger to continue to pass, avoiding the first branch The refrigerant that passes through the heat exchanger tubes of the front heat exchanger or the fourth branch only passes through the heat exchanger tubes of the rear heat exchanger may not have sufficient heat exchange (because of the heat exchanger tubes of the front heat exchanger and the rear heat exchanger) Less), and the possible structural waste of the second branch that only passes through the heat exchanger tubes of the middle heat exchanger (because there are more heat exchanger tubes in the middle heat exchanger), When heat is also such that the front, the effect of heat transfer between the heat exchanger and the rear heat exchanger more balanced, effectively increasing the energy efficiency of the heat exchanger assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application or the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the structure shown in the drawings without paying creative labor.

FIG. 1 is a schematic structural diagram of an embodiment of an air-conditioning indoor unit of the present application;

2 is a schematic flow path diagram of the first embodiment of the heat exchanger assembly in FIG. 1;

3 is a schematic flow diagram of a second embodiment of the heat exchanger assembly in FIG. 1;

4 is a schematic flow diagram of a third embodiment of the heat exchanger assembly in FIG. 1;

FIG. 5 is a schematic flow diagram of a fourth embodiment of the heat exchanger assembly in FIG. 1.

BRIEF DESCRIPTION OF THE DRAWINGS

Label	name	Label	name
1	Heat exchanger assembly	11	Front heat exchanger
111	First platoon	112	First inner row
113	First middle row	12	Medium heat exchanger
121	Second platoon	122	Second row
123	Second middle row	13	Rear heat exchanger
131	Third platoon	132	Third row
133	Third middle row	14	Back tube heat exchanger
15	Distributor	16	windshield
17	First crossover	18	Second crossover takeover
19	Third crossover takeover	2	Heat exchange flow path
twenty one	First way	twenty two	Second branch
twenty three	Third branch	twenty four	Fourth branch
25	First refrigerant main	26	Second refrigerant main
3	cabinet	4	Cross flow wind wheel

The implementation, functional features and advantages of the purpose of this application will be further described with reference to the embodiments and the drawings.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back, etc.) in the embodiment of the present application, the directional indication is only used to explain in a specific posture (as shown in the drawings) (Shown) the relative positional relationship, movement, etc. of the various components, if the specific posture changes, the directional indicator will change accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for description purposes, and cannot be understood as instructions or hints Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on those that can be realized by a person of ordinary skill in the art. When the combination of technical solutions conflicts or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. Is not within the scope of protection claimed in this application.

This application proposes a heat exchanger assembly and an air-conditioning indoor unit having the heat exchanger assembly. Of course, in other embodiments, the heat exchanger assembly can also be applied to an air-conditioning integrated machine or an air-conditioning outdoor unit. Limited to this.

In this embodiment, referring to FIG. 1, the air-conditioning indoor unit is a wall-mounted air-conditioning indoor unit, which specifically includes a housing 3 and a cross-flow wind wheel 4 provided in the housing 3. Of course, the heat exchanger assembly 1 is also provided in the machine Inside the casing 3 and located between the air inlet on the casing 3 and the cross-flow wind wheel 4 to exchange heat for the air sucked by the cross-flow wind wheel 4. It is easy to understand that in this embodiment, after the wall-mounted air-conditioning indoor unit is assembled, the side facing the user is the front and the wall-facing side is the rear. In other words, the heat exchanger assembly 1 is located on the upper side of the cross-flow wind wheel 4. It should be noted that the present design is not limited to this. In other embodiments, the air conditioner indoor unit may also be a vertical indoor air conditioner or the like.

In the embodiment of the present application, referring to FIGS. 1 to 5, the heat exchanger assembly 1 includes:

The main heat exchanger is arranged in a semi-enclosed shape; the main heat exchanger includes a front heat exchanger 11, a middle heat exchanger 12, and a rear heat exchanger 13, a front heat exchanger 11, a middle heat exchanger 12, and a rear heat exchanger. 13 at least three rows of heat exchange tubes are provided in the air inlet direction, and the number of heat exchange tubes of the middle heat exchanger 12 is greater than that of the front heat exchanger 11 and the rear heat exchanger 13; and

The back pipe heat exchanger 14 is installed on the windward side of the main heat exchanger;

First, for the flow path design of the main heat exchanger, the effect of the number of flow paths on the APF (energy efficiency ratio) is shown in Table 1:

Flow path setting method	APF
4 in 4 out	5.25
3 in 3 out	5.01
2 in 2 out	4.65

Table 1

By comparing the corresponding relationship between the number of different flow paths and APF in Table 1, it can be seen that the energy efficiency of the four-input four-output method used in this embodiment is the highest. Therefore, the first branch 21, the second branch 22, and the third The branch 23 and the fourth branch 24 share all the heat exchange tubes of the main heat exchanger.

In this embodiment, the front heat exchanger 11, the middle heat exchanger 12, and the rear heat exchanger 13 are provided with three rows of heat exchange tubes in the air inlet direction, so as to avoid too few rows of heat exchange tubes and insufficient heat exchange. It also prevents too many heat exchanger tubes from being disposed to waste the structure. Of course, in other embodiments, in order to meet the different heat exchange requirements of each heat exchanger, four or even five rows of heat exchangers can be installed in the inlet air direction. However, this design is not limited to this. Specifically, the heat exchange tubes of the front heat exchanger 11 include a first outer row 111, a first middle row 113, and a first inner row 112, and the heat exchange tubes of the middle heat exchanger 12 include a second outer row 121 and a second The middle row 123 and the second inner row 122. The heat exchange tubes of the rear heat exchanger 13 include a third outer row 131, a third middle row 133, and a third inner row 132. The first outer row 111 and the second outer row. 121 and the third outer row 131 are both located on the windward side of the main heat exchanger. It is easy to understand that the addition of the back pipe heat exchanger 14 on the windward side of the main heat exchanger is also to enhance the heat exchange capacity of the heat exchanger assembly 1, without loss of generality, in order to bring the energy efficiency of the back pipe heat exchanger 14 into full play. Maximize and install it on the windward side of the middle heat exchanger 12 with the largest windward area. In particular, it should be avoided as far as possible that there is a gap between the ends of the middle heat exchanger 12 and the rear heat exchanger 13 that are close to each other. In this embodiment, due to the special case size of the air-conditioning indoor unit, the middle heat exchanger 12 and the There is a gap between the ends of the rear heat exchanger 13 that are close to each other. In order to prevent the air entering from the air inlet from directly entering the cross-flow wind wheel 4 without passing through the heat exchanger assembly 1, in this embodiment, the middle heat exchanger 12 and the A wind deflector 16 is also connected across the windward side of the rear heat exchanger 13; for example, but not limited to, both ends of the wind deflector 16 are attached to the middle heat exchanger 12 and the rear heat exchanger 13 by sponges, respectively. In order to ensure the tightness of the contact portion between the windshield plate 16 and the heat exchanger while realizing the connection between the windshield plate 16 and the heat exchanger, the method of sponge bonding also helps users to repair or replace the heat exchanger. When assembly 1 is used, windshield plate 16 is disassembled; of course, in other embodiments, windshield plate 16 can also be installed on middle heat exchanger 12 and rear heat exchanger 13 by means of screw locking. The design is not limited to this. this. In addition, if there is a large gap between the front heat exchanger 11 and the middle heat exchanger 12, a wind deflector 16 may also be added between the two to avoid the situation of air leakage from the heat exchanger assembly 1.

It can be understood that, in addition to the heat exchanger assembly 1 located indoors, the air conditioning heat exchange cycle system also includes outdoor heat exchangers, compressors, and the like. In this embodiment, one end of the back pipe heat exchanger 14 is connected to the main heat exchanger, and the other end is connected to the first refrigerant main pipe 24, and the first refrigerant main pipe 24 is used to connect with the outdoor heat exchanger.

In this embodiment, referring to FIGS. 1 to 4, when the heat exchanger assembly 1 is cooled, the refrigerant sent by the compressor is firstly exchanged by the outdoor heat exchanger, and then enters the back pipe heat exchanger through the first refrigerant main pipe 24. 14, after the back pipe heat exchanger 14, it is divided into a first branch 21, a second branch 22, a third branch 23, and a fourth branch 24, the first branch 21, the second branch 22, and the third branch Both the branch 23 and the fourth branch 24 flow from the heat exchange tubes on the windward side of the main heat exchanger toward the heat exchange tubes on the leeward side; the first branch 21 flows through the heat exchanger tubes of the front heat exchanger 11 and the second branch The circuit 22 and the third branch 23 flow through the heat exchange tubes of the middle heat exchanger 12, the fourth branch 24 flows through the heat exchange tubes of the rear heat exchanger 13, and the first branch 21 and the fourth branch 24 At least one is also disposed across the heat exchanger tubes of the middle heat exchanger 12, and the first branch 21, the second branch 22, the third branch 23, and the fourth branch 24 are collected in one after flowing out of the main heat exchanger. The second refrigerant main pipe 25 flows back to the compressor; when the heat exchanger assembly 1 is heating, the refrigerant sent by the compressor first enters the heat exchanger assembly 1 through the second refrigerant main pipe 25 and flows through the first branch respectively. 21.Second branch 22 The third branch and a fourth branch 23 after completion of the heat exchanger 24, flows back pooled and tube heat exchanger 14, after re-entering the outdoor heat exchanger 24 via a first coolant manifold, and finally back to the compressor. Without loss of generality, when the heat exchanger assembly 1 cools, the refrigerant passes through the back-tube heat exchanger 14 and is split by a distributor 15 into the above-mentioned first branch 21, second branch 22, third branch 23, and The fourth branch 24, of course, in other embodiments, the refrigerant can also be shunted through a flute tube structure, and this design does not limit this.

In addition, for the design of the flow path of the heat exchanger assembly 1 in this embodiment, it should be understood that, under the refrigeration condition, the first branch 21, the second branch 22, the third branch 23, and the fourth branch On 24, the principle of the flow direction of the heat exchange tubes from the outside (windward side) to the inside (leeward side) is adopted to increase the heat exchange temperature difference and maximize the heat exchange efficiency. Table 2 compares and analyzes the heat exchange. The effect of the flow path and other types of flow paths of the heat exchanger assembly 1 from the outer heat exchange tube to the inner heat exchange tube under cooling conditions on the APF (energy efficiency ratio).

Input tube entry method	APF
The four channels in the input tube are all outside and inside	5.22
Three channels in the input tube enter the inside from the outside	5.08
Two outside channels in the input tube enter the inside	4.98
All the way from the input tube to the inside	4.83

Table 2

By comparing the corresponding relationship between different flow path forms and APF in Table 2, it can be known that the four channels used in this embodiment all have the highest energy efficiency in the form of flow paths that flow from the outer heat exchange tube to the inner heat exchange tube.

In order to solve the problem mentioned in the background art, "the size of the casing 3 limits the number of heat exchange tubes between the front heat exchanger 11 and the middle heat exchanger 12, and the refrigerant The heat exchanger 12 exchanges heat, resulting in uneven heat exchange and low energy efficiency ". In this embodiment, the flow path design of the component 1 of the heat exchanger 12 also emphasizes that the first branch 21 and At least one of the fourth branches 24 corresponding to the rear heat exchanger 13 also crosses the heat exchange tubes of the intermediate heat exchanger 12, that is, the flow path is no longer limited to flowing through the front heat exchanger 11 or the rear heat exchanger. 12, instead of connecting the partial heat exchange tubes of the two and the middle heat exchanger 12 in series, in this way, it can effectively make up for the insufficient heat exchange of the front heat exchanger 11 or the rear heat exchanger 13, and can also The structural waste of the middle heat exchanger 12 is avoided, so that the heat exchange balance between the front heat exchanger 11, the rear heat exchanger 13, and the middle heat exchanger 12 and the improvement of energy efficiency are effectively achieved.

In this embodiment, the two-to-two difference between the number of heat exchange tubes flowing through the first branch 21, the second branch 22, the third branch 23, and the fourth branch 24 is controlled to be less than or equal to 3 to avoid four The heat exchange efficiency between the two is too large to achieve a heat exchange balance between the front heat exchanger 11, the middle heat exchanger 12, and the rear heat exchanger 13, and improve the overall energy efficiency of the heat exchanger assembly 1.

In daily life, due to the different design of the home space by the user, there are often related requirements for the size of the cabinet 3 of the wall-mounted air-conditioning indoor unit. In this embodiment, the width L of the cabinet 3 in the front-back direction is less than 800 mm The height dimension H of the casing 3 in the up-and-down direction is less than 295mm; for the heat exchanger assembly 1 adapted to the size of the casing 3, the total number of heat exchange tubes in the main heat exchanger is set to 28 to 31 to limit the It is ensured that the heat exchanger assembly 1 maintains a high energy efficiency in the installation space. In particular, in this embodiment, the number of heat exchange tubes of the main heat exchanger is 30. In addition, within the casing 3 of such a size range, the energy efficiency and space occupation of the cross-flow wind wheel 4 are comprehensively considered. The diameter D of the cross-flow wind wheel 4 is selected between 115 mm and 125 mm, and the inner side of the main heat exchanger and the The distance S between the outer side of the airflow wheel 4 is maintained greater than 10mm, and in order to ensure that the main heat exchanger semi-circles the crossflow airflow wheel 4, it can achieve a better effect of improving the heat exchange energy efficiency and a reliable design of dew condensation. The angle between the rear heat exchanger 13 and the vertical direction is between 38 ° and 48 °, and the angle between the middle heat exchanger 12 and the front heat exchanger 11 and the vertical direction is between 45 ° and 55 °.

The heat exchanger assembly 1 of the technical solution of the present application includes a main body heat exchanger and a back-pipe heat exchanger 14 provided on the windward side of the main body heat exchanger. The main body heat exchanger includes a front heat exchanger 11, a middle heat exchanger 12, and a rear heat exchanger. When the heat exchanger 13 and the heat exchanger assembly 1 are cooled, the heat exchange flow path 2 after passing through the back-tube heat exchanger 14 is divided into the first branch 21, the second branch 22, the third branch 23, and the fourth branch. Road 24, the first branch 21 flows through the front heat exchanger 11, the second branch 22 and the third branch 23 flow through the middle heat exchanger 12, and the fourth branch 24 flows through the rear heat exchanger 13, One of the first branch line 21 and the fourth branch line 24 crosses the heat exchange tubes of the middle heat exchanger 12, so that after improving the flow path, a part of the heat exchange tubes in the middle heat exchanger 12 can be used for passing The refrigerant of the heat exchanger tubes of the front heat exchanger 11 or the rear heat exchanger 13 continues to pass, avoiding that the first branch 21 passes only the heat exchange tubes of the front heat exchanger 11 or the fourth branch 24 passes only the rear heat exchanger. The heat exchange tube of 13 may have insufficient refrigerant heat exchange (because there are fewer heat exchange tubes of the front heat exchanger 11 and the rear heat exchanger 13), and the second branch 22 is only exchanged by the middle heat exchanger 12 Heat pipe may appear Structure waste problem (because there are many heat exchanger tubes in the middle heat exchanger 12), it also makes the heat exchange effect between the front heat exchanger 11, the rear heat exchanger 12 and the middle heat exchanger 13 more balanced, effectively improving This improves the energy efficiency of the heat exchanger components.

As we all know, the use of small-diameter heat exchange tubes can reduce the use of heat-exchange tubes, and then significantly reduce the overall cost of the heat exchanger assembly 1. However, when the refrigerant passes through the small-diameter heat exchange tubes, the heat exchange resistance is large. The large pressure loss is not conducive to the circulating flow of the refrigerant. In this embodiment, considering the cost of the heat exchanger assembly 1 and the refrigerant circulation flow efficiency, the diameter of the heat exchange tube of the back-pipe heat exchanger 14 is set to be larger than that of the main heat exchanger. When the heat exchanger component 1 is cooled, the refrigerant first enters the large-diameter heat exchange tube of the back-tube heat exchanger 14 and then splits into the small-diameter heat exchange tube of the main heat exchanger, that is, when the refrigerant changes from a gaseous state. In the process of being liquid, the contact area between the refrigerant and the heat exchange tube should be increased accordingly. When the heat exchanger component 1 is heating, the refrigerant is first shunted in the small-diameter heat exchange tube of the main heat exchanger, and then aggregated into The large-diameter heat-exchange tubes of the back-tube heat exchanger 14 are compared and analyzed in Table 3 for the effect of the refrigerant flow in different tube diameters on the APF in the heat exchanger module 1 under heating conditions.

Flow direction of combined pipe diameter refrigerant	APF
When heating, first enter the small diameter and then enter the large diameter.	5.25
When heating, first enter the large diameter and then enter the small diameter.	5.01

table 3

Comparing the corresponding relationship between different flow path forms and APF in Table 3, it can be seen that the refrigerant used in this embodiment flows through a small-diameter heat exchanger tube and then a large-diameter heat exchanger tube under heating conditions. The energy efficiency of the method is the highest. Without loss of generality, the heat exchanger tubes of the back-tube heat exchanger 14 adopt a diameter of φ7, and the heat exchanger tubes of the main heat exchanger adopt a diameter of φ5. It can be understood that the heat exchanger tubes of φ7 and φ5 are both The heat exchange tubes widely used in the prior art, therefore, the selection of the above two tube diameters is helpful to reduce the difficulty of obtaining the heat exchange tubes and reduce the manufacturing cost of the heat exchanger assembly 1. Of course, in other embodiments In the back tube heat exchanger 14 and the main heat exchanger, the respective heat exchange tubes can also be specifically other tube diameter sizes. For example, the heat exchange tubes of the back tube heat exchanger 14 can also adopt a diameter of φ6. Limited to this. In addition, in this embodiment, considering the energy efficiency requirements of the heat exchanger assembly and the size limitation of the casing 3, the number of heat exchange tubes of the back-tube heat exchanger 14 is preferably 2 to 4, and in order to make the back-tube heat exchanger 14 is better set to face the air inlet on the casing 3, so that the back-pipe heat exchanger 14 is arranged near the front heat exchanger relative to the rear heat exchanger.

Further, referring to FIG. 1 to FIG. 5, it can be understood that, generally, the size of the rear heat exchanger 13 is larger than that of the front heat exchanger 11, and the corresponding number of heat exchange tubes can be larger than that of the front heat exchanger 11. As for the heat exchanger 13, when there is only the fourth branch sharing all the heat exchange tubes of the rear heat exchanger 13, there may also be a problem that the refrigerant flows to the later heat exchange tubes and the cooling capacity is insufficient. Therefore, this implementation In the example, the first branch 21 crosses the heat exchange tube of the middle heat exchanger 12, and the third branch 23 crosses the heat exchange tube of the post heat exchanger 13. In particular, the first branch 21 flows through the middle heat exchanger Part of the heat exchanger tubes of the heat exchanger 12 and all the heat exchanger tubes of the front heat exchanger 11, the second branch 22 flows through the other part of the heat exchanger tubes of the middle heat exchanger 12, the third branch 23 and the fourth branch 24 The remaining heat exchange tubes of the middle heat exchanger 12 and all the heat exchange tubes of the rear heat exchanger 13 are shared. In this way, it is equivalent to borrowing the heat exchange tubes of the middle heat exchanger 12 in the first branch to make full use of the first branch. The energy efficiency of the refrigerant in 21, and the third branch 23 and the fourth branch 24 share the heat exchanger tubes of the rear heat exchanger 13 to avoid that the fourth branch 24 is too long and the cooling effect in the rear section is not good. To better enhance the effect of body heat exchanger as a whole. It should be noted that this design is not limited to this. In other embodiments, the number of heat exchange tubes of the front heat exchanger 11 is greater than that of the rear heat exchanger 13, then the corresponding flow path is designed to be replaced by the fourth branch 24 across the warp. The heat exchanger tubes of the heat exchanger 12, and the third branch 23 crosses the heat exchanger tubes of the front heat exchanger 11.

The following describes the specific flow path design of the main heat exchanger. Taking the heat exchanger assembly 1 in a refrigeration state as an example, in the first embodiment of the present application:

Referring to FIG. 2, when the heat exchanger assembly 1 is cooled, the first branch 21 flows from the second outer row 121, flows along the second outer row 121 toward a side closer to the front heat exchanger 11, and passes through the first crossover pipe. 17 enters the first outer row 111 and sequentially flows through the entire first outer row 111, the first middle row 113, and the first inner row 112, and flows out from the heat exchange tubes of the first inner row 112. It can be understood that the first branch 21 flows to the heat exchanger tube of the middle heat exchanger 12 closest to the front heat exchanger 11, and then enters the front heat exchanger 11 through the first jumper pipe 17, which is beneficial to reducing the first jumper pipe 17. And the gap between the front heat exchanger 11 and the middle heat exchanger 12. Specifically, the first branch 21 passes through the two heat exchange tubes of the second outer row 121 and enters the front heat exchanger 11 through the first crossover pipe 17. It should be noted that this design is not limited to this. In other embodiments, the first branch circuit 21 may also flow in from the heat exchange tubes of the first outer row 111, or from the heat exchange tubes of other positions of the second outer row 121. .

Further, the second branch 22 flows from the middle and rear part of the second outer row 121 and enters the second middle row 123, flows along the second middle row 123 toward the side close to the front heat exchanger 11, and then flows from the second The heat exchange tubes of the middle row 123 closest to the front heat exchanger 11 are transferred to the second inner row 122, and flow along the second inner row 122 toward the side away from the front heat exchanger 11, and then from the second inner row 122 The heat exchange tubes flow out. It can be understood that the second branch 22 flows in the second outer row 121 and the second middle row 123 toward the side close to the front heat exchanger 11 to change the second outer row 121 and the second middle row 123 closer to the rear. The heat exchange tubes of the heat exchanger 13 are reserved for the third branch 23 and the fourth branch 24 to facilitate the crossover between the third branch 23 and the rear heat exchanger 13 or the fourth branch 24 and the middle heat exchanger 12 Take the tube. Specifically, the second branch 22 passes through a heat exchange tube of the second outer row 121 and enters the second middle row 123. After the second middle row 123 flows forward through the three heat exchange tubes and enters the second inner row 122, The second inner row 122 flows backward through three heat exchange tubes and then flows out. It should be noted that the present design is not limited to this, and the second branch 22 may also flow in from other positions of the second outer row 121.

Further, the third branch 23 flows in from the second outer row 121 and sequentially flows through the heat exchange tubes of the second outer row 121, the second middle row 123, and the second inner row 122 near the rear heat exchanger 13, and then It enters the third inner row 132 through the second crossover pipe 18, turns into the third middle row 133, and flows out from the heat exchange tubes of the third inner row 132. It can be understood that the third branch 23 flows through the remaining heat exchanger tubes of the middle heat exchanger 12, and then the heat exchanger tubes of the rear heat exchanger 13 near the middle heat exchanger 12 are borrowed, so that the refrigeration in the third branch 23 is cooled. Agent is fully utilized. Specifically, the third branch 23 enters the rear heat exchanger 13 after the middle heat exchanger 12 passes through the second outer row 121, the second middle row 123, and the second inner row 122, and then enters the rear heat exchanger 13, and passes through the rear heat exchanger. The third middle row 133 and the third inner row 132 of the heater 13 flow out after a total of three heat exchange tubes. It should be noted that this design is not limited to this. In other embodiments, the third branch 23 may also be transferred to other heat exchange tubes of the rear heat exchanger 13 through the second jumper tube 18, or from the rear heat exchanger 13 The heat exchange tube is connected to the main heat exchanger.

Further, the fourth branch line 24 flows from the third outer row 131, flows along the third outer row 131 toward the side away from the middle heat exchanger 12, and sequentially flows through the entire third outer row 131 and the third middle row 133 and the remainder of the third inner row 132 flow out from the heat exchange tubes of the third inner row 132 again. In this embodiment, the fourth branch line 24 flows in from the upper end of the windward side of the rear heat exchanger 13, because the air volume at this position can better adapt to the higher energy of the refrigerant in the fourth branch line 24 at this time. To better achieve the heat exchange of the refrigerant. Specifically, the fourth branch line 24 flows out of the rear heat exchanger 13 after passing through eight heat exchange tubes from the outside to the inside. It should be noted that the present design is not limited to this. In other embodiments, the fourth branch circuit 24 may also enter the rear heat exchanger 13 from other heat exchange tubes of the third outer row 131.

Based on the specific flow path design of the main heat exchanger in this embodiment above, Table 4 compares and analyzes the influence of the distribution mode of the number of heat exchange tubes in the four branches on the APF.

Branch copper pipe distribution method	APF
9 + 9 + 9 + 3	4.69
3 + 9 + 9 + 9	4.76
9 + 3 + 9 + 9	4.81
9 + 7 + 6 + 8	5.22

Table 4

Comparing the corresponding relationship between the distribution method of the number of heat exchange tubes in Table 4 and the APF, it is preferable to use the first branch 21 through nine heat exchange tubes, the second branch 22 through seven heat exchange tubes, and the third branch 23 The scheme of passing six heat exchange tubes and the fourth branch line 24 through eight heat exchange tubes to maximize the energy efficiency of the heat exchanger assembly 1; and in this way, the first branch 21 and the second branch 22 pass through the heat exchange tubes The difference between the number of roots is 2, the difference between the number of the first branch 21 and the third branch 23 passing through the heat exchanger tube is 3, the difference between the first branch 21 and the fourth branch 24 is 1, and the second The difference between the number of branches 22 and the third branch 23 passing through the heat exchange tubes is 1. The difference between the second branch 22 and the fourth branch 24 is 1. The difference between the third branch 23 and the fourth branch 24 is 1. The difference is 2. Obviously, this also meets the previous limit of less than or equal to 3 for the difference in the number of heat exchange tubes passing between any two branches in order to improve the energy efficiency of the heat exchanger assembly 11.

In a second embodiment of the present application:

Referring to FIG. 3, when the heat exchanger assembly 1 is cooled, the first branch 21 flows from the second outer row 121, flows along the second outer row 121 toward the side closer to the front heat exchanger 11, and passes through the first crossover pipe. 17 enters the first outer row 111 and sequentially flows through the entire first outer row 111, the first middle row 113, and the first inner row 112, and flows out from the heat exchange tubes of the first inner row 112. It can be understood that the first branch 21 flows to the heat exchanger tube of the middle heat exchanger 12 closest to the front heat exchanger 11, and then enters the front heat exchanger 11 through the first jumper pipe 17, which is beneficial to reducing the first jumper pipe 17. And the gap between the front heat exchanger 11 and the middle heat exchanger 12. Specifically, the first branch 21 passes through the two heat exchange tubes of the second outer row 121 and enters the front heat exchanger 11 through the first crossover pipe 17. It should be noted that this design is not limited to this. In other embodiments, the first branch circuit 21 may also flow in from the heat exchange tubes of the first outer row 111, or from the heat exchange tubes of other positions of the second outer row 121. .

Further, the second branch 22 flows in from the heat exchange tube of the second outer row 121 closest to the rear heat exchanger 13 and flows along the second outer row 121 toward the side close to the front heat exchanger 11 through the second outer row. The remaining part of 121 is transferred to the second middle row 123 and flows along the second middle row 123 toward the side close to the front heat exchanger 11 until the heat exchange of the second middle row 123 closest to the front heat exchanger 11 is reached. The tube is transferred into the second inner row 122 and flows along the second inner row 122 toward a side far from the front heat exchanger 11, and then flows out through the heat exchange tube of the second inner row 122. It can be understood that in this way, the second branch 22 always flows forward in the second outer row 121, which reduces its design difficulty. Specifically, the second branch 22 flows into the second middle row 123 after passing through the three heat exchange tubes in the second outer row 121 toward the front, and flows into the second inner row after passing through the two heat exchange tubes in the second middle row 123 toward the front. The row 122 flows backward in the second inner row 122 after passing through the two heat exchange tubes. It should be noted that the present design is not limited to this. In other embodiments, the second branch 22 may also flow in from other positions of the second outer row 121.

Further, the third branch 23 flows in from the heat exchange tube of the third middle row 133 closest to the middle heat exchanger 12 and flows along the third middle row 133 toward the side away from the middle heat exchanger 12 and then turns into the first The three inner rows 132 flow along the third inner row 132 toward the side close to the middle heat exchanger 12, and then enter the second middle row 123 closest to the heat exchanger tube of the rear heat exchanger 13 through the second crossover pipe 18, and Flow along the second middle row 123 toward the side away from the rear heat exchanger 13 and pass through the remainder of the second middle row 123, then turn into the second inner row 122 and approach the rear heat exchanger 13 along the second inner row 122 One side flows through the remaining portion of the second inner row 122 and flows out through the heat exchange tubes of the second inner row 122. It can be understood that the introduction of the third branch 23 from the rear heat exchanger 13 is beneficial to reduce the structural complexity of the upper flow path design of the middle heat exchanger 12, and the third branch 23 flows to the third inner row 132 closest to the middle exchange The heat exchange tube of the heat exchanger 12 enters the front heat exchanger 11 through the second jumper pipe 18, which is beneficial to reducing the length of the second jumper pipe 18 and the gap between the middle heat exchanger 12 and the rear heat exchanger 13. . Specifically, the third branch 23 flows through the two middle heat exchange tubes in the third middle row 133 and the third inner row 132, and then enters the second middle row 123 through the second crossover pipe 18, and the second middle row 123 and The second inner row 122 flows out after passing through the five heat exchange tubes in total. It should be noted that the present design is not limited to this. In other embodiments, the third branch 23 may also flow in from the third outer row 131 or the heat exchange tube of the middle heat exchanger 12.

Further, the fourth branch line 24 flows from the heat exchange tube of the third outer row 131 closest to the middle heat exchanger 12 and flows through the entire third outer row 131, and the third middle row 133 and the third inner row 132. The remaining part flows out through the heat exchange tubes of the third inner row 132. In this embodiment, the fourth branch line 24 flows in from the upper end of the windward side of the rear heat exchanger 13, because the air volume at this position can better adapt to the higher energy of the refrigerant in the fourth branch line 24 at this time. To better achieve the heat exchange of the refrigerant. Specifically, the fourth branch line 24 flows out of the rear heat exchanger 13 after passing through eight heat exchange tubes from the outside to the inside. It should be noted that the present design is not limited to this. In other embodiments, the fourth branch circuit 24 may also enter the rear heat exchanger 13 from other heat exchange tubes of the third outer row 131.

Based on the specific flow path design of the main heat exchanger in this embodiment above, Table 5 compares and analyzes the influence of the distribution method of the number of heat exchange tubes in the four branches on the APF.

Branch copper pipe distribution method	APF
8 + 7 + 7 + 8	5.25
3 + 9 + 9 + 9	4.76
9 + 3 + 9 + 9	4.81
9 + 9 + 9 + 3	4.67

table 5

Comparing the corresponding relationship between the distribution method of the number of heat exchange tubes in Table 5 and the APF, it is preferable to use the first branch 21 through eight heat exchange tubes, the second branch 22 through seven heat exchange tubes, and the third branch 23 The scheme of passing the seven heat exchange tubes and the fourth branch line 24 through the eight heat exchange tubes to maximize the energy efficiency of the heat exchanger assembly 1; and in this way, the first branch line 21 and the second branch line 22 pass the heat exchange The difference between the number of tubes is 1, the difference between the number of the first branch 21 and the third branch 23 passing through the heat exchange tube is 1, and the difference between the first branch 21 and the fourth branch 24 is 0. The difference between the number of the second branch 22 and the third branch 23 passing through the heat exchange tube is 0, the difference between the second branch 22 and the fourth branch 24 is 1, and the third branch 23 and the fourth branch 24 are Obviously, this also meets the previous limit of less than or equal to 3 for the difference in the number of heat exchange tubes between any two branches in order to improve the energy efficiency of the heat exchanger assembly 1.

In a third embodiment of the present application:

Referring to FIG. 4, when the heat exchanger assembly 1 is cooled, the first branch 21 flows from the second outer row 121, flows along the second outer row 121 toward the side closer to the front heat exchanger 11, and passes through the first crossover pipe. 17 enters the first outer row 111 and sequentially flows through the entire first outer row 111, the first middle row 113, and the first inner row 112, and flows out from the heat exchange tubes of the first inner row 112. It can be understood that the first branch 21 flows to the heat exchanger tube of the middle heat exchanger 12 closest to the front heat exchanger 11, and then enters the front heat exchanger 11 through the first jumper pipe 17, which is beneficial to reducing the first jumper pipe 17. And the gap between the front heat exchanger 11 and the middle heat exchanger 12. Specifically, the first branch 21 passes through the two heat exchange tubes of the second outer row 121 and enters the front heat exchanger 11 through the first crossover pipe 17. It should be noted that this design is not limited to this. In other embodiments, the first branch circuit 21 may also flow in from the heat exchange tubes of the first outer row 111, or from the heat exchange tubes of other positions of the second outer row 121. .

Further, the second branch 22 flows in from the heat exchange tube adjacent to the first branch 21 on the second outer row 121 and flows along the second outer row 121 toward the side away from the front heat exchanger 11 Flow, and then flows into the second middle row 123, and flows along the second middle row 123 toward the side close to the front heat exchanger 11, until it reaches the heat exchange tube of the second middle row 123 closest to the front heat exchanger 11, and turns into The second inner row 122 flows along the second inner row 122 toward a side remote from the front heat exchanger 11, and then flows out through the heat exchange tubes of the second inner row 122. In this embodiment, the second branch 22 flows backward along the second outer row 121, and flows to the middle and rear part of the second outer row 121, then turns into the second middle row 123, and forwards along the second middle row 123 Flow, flow to the front end of the second middle row 123, then turn into the second inner row 122 and flow backwards, until it flows out from the middle position of the second inner row 122, so that the second outer row 121, the second middle row 123 and the second inner row 122 of the heat exchanger tubes near the rear heat exchanger 13 are reserved for the third branch 23 and the fourth branch 24, which is convenient for the third branch 23 and the rear heat exchanger 13 or the fourth branch The crossover tube between 24 and the middle heat exchanger 12 goes away. Specifically, the second branch 22 enters the second middle row 123 after the second outer row 121 flows through the two heat exchange tubes, and flows into the second inner row 122 after the third middle row 123 flows through the three heat exchange tubes. The second inner row 122 flows out after passing through two heat exchange tubes. It should be noted that the present design is not limited to this, and the second branch 22 may also flow in from other positions on the second outer row 121.

Further, the third branch 23 flows in from the second outer row 121, and then flows through the second middle row 123, the second inner row 122 in sequence, and then enters the third outer row 131 through the second crossover pipe 18, and flows in sequence. The third outer row 131, the third middle row 133, and the third inner row 132 flow out through the heat exchange tubes of the third inner row 132. In this embodiment, the third branch 23 flows in from the top end of the windward side of the second outer row 121 because the air volume at this position can better adapt to the higher energy of the refrigerant in the third branch 23 at this time. In order to better realize the heat exchange of the refrigerant, in addition, the third branch 23 flows out from the rear heat exchanger 13, which is also conducive to reducing the complexity of the flow path design of the middle heat exchanger 12. Specifically, the third branch 23 flows in the second outer row 121, the second middle row 123, and the second inner row 122 through the two heat exchange tubes, and then flows into the rear heat exchanger 13. It should be noted that the present design is not limited to this, the third branch 23 can also flow in from other positions of the second outer row 121, or the third branch 23 can also flow out from the second inner row 122.

Further, the fourth branch line 24 flows in from the heat exchange tube of the third outer row 131 closest to the middle heat exchanger 12, and flows along the third outer row 131 toward a side remote from the middle heat exchanger 12, and then flows into the third The middle row 133 flows along the third middle row 133 toward the side close to the middle heat exchanger 12 until it reaches the heat exchange tube of the third middle row 133 closest to the middle heat exchanger 12 and turns into the third inner row 132, And flows along the third inner row 132 toward the side away from the middle heat exchanger 12, and then enters the second inner row 122 near the rear heat exchanger 13 through the third crossover pipe 19, and faces away from the rear heat exchanger One side of 13 alternately flows between the heat exchange tubes of the second middle row 123 and the second inner row 122, and then flows out through the heat exchange tubes in the middle of the second inner row 122. It can be understood that the fourth branch line 24 flows in from the upper end of the windward side of the rear heat exchanger 13, because the air volume at this position can be better adapted to the higher energy of the refrigerant in the fourth branch line 24 at this time, that is, Can better realize the heat exchange of refrigerant. Specifically, the fourth branch circuit 24 flows into the second inner row 122 after passing through the four heat exchange tubes in the third outer row 131, the third middle row 133, and the third inner row 132. The second middle row 123 flows through three heat exchange tubes and then flows out. It should be noted that this design is not limited to this. In other embodiments, the fourth branch line 24 may also flow in from another position of the third outer row 131, or the fourth branch line 24 may also flow from the third inner row 132. Outflow.

Based on the specific flow path design of the main heat exchanger in this embodiment above, Table 6 compares and analyzes the influence of the distribution mode of the number of heat exchange tubes in the four branches on the APF.

Branch copper pipe distribution method	APF
8 + 7 + 7 + 8	5.25
3 + 9 + 9 + 9	4.76
9 + 3 + 9 + 9	4.81
9 + 9 + 9 + 3	4.67

Table 6

Comparing the corresponding relationship between the distribution method of the number of heat exchange tubes in Table 6 and the APF, it is preferable to use the first branch 21 through eight heat exchange tubes, the second branch 22 through seven heat exchange tubes, and the third branch 23 The scheme of passing the seven heat exchange tubes and the fourth branch line 24 through the eight heat exchange tubes to maximize the energy efficiency of the heat exchanger assembly 1; and in this way, the first branch line 21 and the second branch line 22 pass the heat exchange The difference between the number of tubes is 1, the difference between the number of the first branch 21 and the third branch 23 passing through the heat exchange tube is 1, and the difference between the first branch 21 and the fourth branch 24 is 0. The difference between the number of the second branch 22 and the third branch 23 passing through the heat exchange tube is 0, the difference between the second branch 22 and the fourth branch 24 is 1, and the third branch 23 and the fourth branch 24 are Obviously, this is also in line with the previous limit of less than or equal to 3 for the difference in the number of heat exchange tubes between any two branches in order to improve the energy efficiency of the heat exchanger assembly 11.

Referring to FIG. 5, the fourth embodiment of the present application is different from the third embodiment of the present application only in that the fourth branch line 24 flows from the third outer row 131 to the heat exchange tube closest to the middle heat exchanger 12 And flows along the third outer row 131 toward the side away from the middle heat exchanger 12 and then flows into the third middle row 133 and flows along the third middle row 133 toward the side closer to the middle heat exchanger 12 and turns into the first The three inner rows 132 return to the third middle row 133 closest to the heat exchanger tube of the middle heat exchanger 12, and then flow through the third inner row 132 closest to the heat exchanger tubes of the middle heat exchanger 12 and pass through the third span. The takeover pipe 19 enters the second inner row 122, flows along the second inner row 122 toward the side away from the rear heat exchanger 13, and flows out through the heat exchange pipe of the second inner row 122. Compared with the third embodiment, the first A design manner in which the four branches 24 alternately flow between the second middle row 123 and the second inner row 122. In this embodiment, the fourth branch 24 flows forward in the middle heat exchanger 12 along the second inner row 122 The simple design of the flow path is conducive to reducing the production cost of the structure.

Based on the specific flow path design of the main heat exchanger in this embodiment above, Table 7 compares and analyzes the influence of the distribution mode of the number of heat exchange tubes in the four branches on the APF.

Branch copper pipe distribution method	APF
9 + 9 + 9 + 3	4.96
3 + 9 + 9 + 9	4.76
9 + 3 + 9 + 9	4.81
8 + 7 + 8 + 7	5.28

Table 7

Comparing the corresponding relationship between the distribution method of the number of heat exchange tubes in Table 7 and the APF, it is preferable to use the first branch 21 through eight heat exchange tubes, the second branch 22 through seven heat exchange tubes, and the third branch 23 The scheme of passing eight heat exchange tubes and the fourth branch line 24 through seven heat exchange tubes to maximize the energy efficiency of the heat exchanger assembly 1; and in this way, the first branch line 21 and the second branch line 22 pass heat exchange The difference between the number of tubes is that the difference between the number of the first branch 21 and the third branch 23 passing through the heat exchange tube is 0, the difference between the first branch 21 and the fourth branch 24 is 1, and the second The difference between the number of branches 22 and the third branch 23 passing through the heat exchange tube is 1, the difference between the second branch 22 and the fourth branch 24 is 0, and the difference between the third branch 23 and the fourth branch 24 is The difference is 1. Obviously, this also meets the previous limit of less than or equal to 3 for the difference in the number of heat exchange tubes passing between any two branches in order to improve the energy efficiency of the heat exchanger assembly 1.

The present application also proposes an air conditioner, which includes an air conditioner outdoor unit and an air conditioner indoor unit. For a specific structure of the air conditioner indoor unit, refer to the foregoing embodiment. Since the air conditioner indoor unit adopts all the technical solutions of all the embodiments described above, It has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, and is not repeated here one by one.

The above is only a preferred embodiment of the present application, and thus does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect use of the specification and drawings of the present application under the concept of the application of the present application All other related technical fields are covered by the patent protection scope of this application.

Claims (20)

1. A heat exchanger assembly for an indoor unit of an air conditioner, which includes:

   The main heat exchanger is arranged in a semi-enclosed shape. The main heat exchanger includes a front heat exchanger, a middle heat exchanger, and a rear heat exchanger. The front heat exchanger, the middle heat exchanger, and the rear heat exchanger are in At least three rows of heat exchange tubes are arranged in the air inlet direction, and the number of heat exchange tubes of the middle heat exchanger is greater than that of the front heat exchanger and the rear heat exchanger; and

   The back-pipe heat exchanger is installed on the windward side of the main body heat exchanger;

   When the heat exchanger assembly is cooled, the heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch, a third branch, and a fourth branch after passing through the back-tube heat exchanger. The first branch, the second branch, the third branch, and the fourth branch all flow from the heat exchange tube on the windward side to the heat exchange tube on the leeward side of the main heat exchanger; The branch flows through the heat exchange tubes of the front heat exchanger, the second branch and the third branch flow through the heat exchange tubes of the middle heat exchanger, and the fourth branch flows through the rear The heat exchange tubes of the heat exchanger, and at least one of the first branch and the fourth branch is also disposed across the heat exchange tubes of the middle heat exchanger.
2. The heat exchanger assembly according to claim 1, wherein a pairwise difference between the number of heat exchange tubes flowing through each of the first branch, the second branch, the third branch, and the fourth branch is less than or Is equal to 3.
3. The heat exchanger assembly according to claim 2, wherein the front heat exchanger, the middle heat exchanger, and the rear heat exchanger are each provided with three rows of heat exchange tubes, and the total number of heat exchange tubes of the main heat exchanger It is 28 to 31 pieces.
4. The heat exchanger assembly according to claim 1, wherein the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger, and when the heat exchanger assembly is refrigerated, the first branch road spans The third branch passes through the heat exchange tubes of the middle heat exchanger, and passes through the heat exchange tubes of the rear heat exchanger.
5. The heat exchanger assembly according to claim 4, wherein the first branch flows through a part of the heat exchange tubes of the middle heat exchanger and all the heat exchange tubes of the front heat exchanger, and the first Two branches flow through another part of the heat exchanger of the middle heat exchanger, and the third branch and the fourth branch share the remaining heat exchanger tubes of the middle heat exchanger and the rear heat exchanger. All heat transfer tubes.
6. The heat exchanger assembly according to claim 5, wherein the heat exchanger tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchanger tubes of the middle heat exchanger Including a second outer row, a second middle row, and a second inner row, the first outer row and the second outer row being located on the windward side of the main body heat exchanger;

   When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row toward a side close to the front heat exchanger, and passes through the first span The takeover tube enters the first outer row, flows through the entire first outer row, the first middle row, and the first inner row in sequence, and flows out from the heat exchange tubes of the first inner row.
7. The heat exchanger assembly according to claim 6, wherein when the heat exchanger assembly is refrigerated, the second branch flows from the second outer row and enters the second middle row, along the The second middle row flows toward the side close to the front heat exchanger, and then the second middle row is transferred from the heat exchange tube closest to the front heat exchanger to the second inner row, and along the second row The second inner row flows toward a side remote from the front heat exchanger, and then flows out from the heat exchange tubes of the second inner row.
8. The heat exchanger assembly according to claim 5, wherein the heat exchange tubes of the middle heat exchanger include a second outer row, a second middle row, and a second inner row, and the heat exchange tubes of the rear heat exchanger Including a third outer row, a third middle row, and a third inner row, wherein the second outer row and the third outer row are located on the windward side of the main heat exchanger;

   When the heat exchanger assembly is refrigerated, the third branch flows from the second outer row and sequentially flows through the second outer row, the second middle row, and the second inner row near the rear changer. The heat exchange tube at one end of the heater enters the third inner row through the second crossover pipe, turns into the third middle row, and flows out from the heat exchange tube in the third inner row.
9. The heat exchanger assembly according to claim 8, wherein when the heat exchanger assembly is refrigerated, the fourth branch flows from the third outer row and moves away from the third outer row along the third outer row. One side of the middle heat exchanger flows through the third outer row and the remaining parts of the third middle row and the third inner row in order, and then flows out from the heat exchange tubes of the third inner row. .
10. The heat exchanger assembly of claim 1, wherein the heat exchanger tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchanger tubes of the middle heat exchanger Including a second outer row, a second middle row, and a second inner row, the heat exchanger tubes of the rear heat exchanger include a third outer row, a third middle row, and a third inner row. Two outer rows and a third outer row are located on the windward side of the main heat exchanger, and the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger;

    When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row, and enters the first outer row through a first crossover pipe, and sequentially Flows through the first outer row, the first middle row, and the first inner row, and flows out from the heat exchange tubes of the first inner row, the second branch flows in from the second outer row, and flows in sequence Into the second middle row and the second inner row, and flow out from the heat exchange tubes of the second inner row, the third branch flows from the third middle row, and flows through the third inner row, It then enters the second middle row through a second crossover pipe, flows through the second middle row and the second inner row in sequence, and flows out through the heat exchange tubes of the second inner row. The fourth branch It flows in from the third outer row, flows through the third middle row, the third inner row in sequence, and flows out through the heat exchange tubes of the third inner row.
11. The heat exchanger assembly of claim 1, wherein the heat exchanger tubes of the front heat exchanger include a first outer row, a first middle row, and a first inner row, and the heat exchanger tubes of the middle heat exchanger Including a second outer row, a second middle row, and a second inner row, the heat exchanger tubes of the rear heat exchanger include a third outer row, a third middle row, and a third inner row. Two outer rows and a third outer row are located on the windward side of the main heat exchanger, and the number of heat exchange tubes of the rear heat exchanger is greater than that of the front heat exchanger;

    When the heat exchanger assembly is refrigerated, the first branch flows from the second outer row, flows along the second outer row, and enters the first outer row through a first crossover pipe, and sequentially Flows through the first outer row, the first middle row, and the first inner row, and flows out from the heat exchange tubes of the first inner row, the second branch flows in from the second outer row, and flows in sequence Into the second middle row and the second inner row, and flow out from the heat exchange tubes of the second inner row, the third branch flows from the second outer row, and flows through the second middle row in sequence And the second inner row, and then enter the third outer row through the second crossover pipe, and flow through the third outer row, the third middle row, and the third inner row in sequence, and pass through the third inner row. The heat exchange pipe flows out, the fourth branch flows from the third outer row, and then flows through the third middle row, the third inner row, and then the third crossover pipe into the second inner row and passes through. The second inner row of heat exchange tubes flows out.
12. The heat exchanger assembly according to claim 1, wherein a diameter of a heat exchange tube of the back-tube heat exchanger is larger than a diameter of a heat exchange tube of the main heat exchanger.
13. The heat exchanger assembly according to claim 12, wherein the back-tube heat exchanger is installed on the windward side of the middle heat exchanger.
14. The heat exchanger assembly according to claim 13, wherein the back-tube heat exchanger is disposed near the front heat exchanger relative to the rear heat exchanger.
15. The heat exchanger assembly according to claim 12, wherein the number of heat exchange tubes of the back-pipe heat exchanger is 2 to 4.
16. An indoor unit of an air conditioner includes a heat exchanger component and a casing for accommodating the heat exchanger component; the heat exchanger component includes
17. The air conditioner indoor unit according to claim 16, wherein a width dimension of the cabinet in the front-back direction is less than 800 mm, and a height dimension of the cabinet in the vertical direction is less than 295 mm.
18. The indoor unit of air conditioner according to claim 16, wherein when the heat exchanger assembly is disposed in the casing, the angle between the arrangement direction of the rear heat exchanger and the vertical direction is 38 ° ~ 48 °.
19. The indoor unit of an air conditioner according to claim 16, wherein when the heat exchanger assembly is provided in the casing, an angle range between an arrangement direction of the middle heat exchanger and a front heat exchanger and an up-down direction It is 45 ° ~ 55 °.
20. The air conditioner indoor unit according to claim 16, wherein the mutually adjacent ends of the middle heat exchanger and the rear heat exchanger abut each other; or

    A gap exists between one end of the middle heat exchanger and the rear heat exchanger that are close to each other. The air conditioner indoor unit further includes a wind deflector, and the wind deflector bridges the middle heat exchanger and the rear heat exchanger. Between the windward sides of the devices near each other.