CN109269071B

CN109269071B - Machine in heat exchanger subassembly and air conditioning

Info

Publication number: CN109269071B
Application number: CN201811028543.9A
Authority: CN
Inventors: 张强; 谢李高; 宋分平; 山崎和雄; 吕建华; 刘行
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: 2018-09-03
Filing date: 2018-09-03
Publication date: 2020-04-21
Anticipated expiration: 2038-09-03
Also published as: CN109269071A

Abstract

The invention discloses a heat exchanger assembly and an air-conditioning indoor unit, wherein the heat exchanger assembly is used for the air-conditioning indoor unit and is characterized by comprising the following components: the main heat exchanger comprises a front heat exchanger, a middle heat exchanger and a rear heat exchanger, wherein the front heat exchanger, the middle heat exchanger and the rear heat exchanger are respectively provided with at least two rows of heat exchange tubes, and the number of the heat exchange tubes of the middle heat exchanger is larger than that of the front heat exchanger and that of the rear heat exchanger; a back-tube heat exchanger; a heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch and a third branch after passing through the back tube heat exchanger, and the first branch, the second branch and the third branch flow from a heat exchange tube on the windward side of the main body heat exchanger to a heat exchange tube on the leeward side; the first branch flow passes through the heat exchange tube of the front heat exchanger, the second branch flow passes through the heat exchange tube of the middle heat exchanger, the third branch flow passes through the heat exchange tube of the rear heat exchanger, and at least one of the first branch flow and the third branch flow is arranged across the heat exchange tube of the middle heat exchanger. The technical scheme of the invention can improve the energy efficiency of the heat exchanger.

Description

Machine in heat exchanger subassembly and air conditioning

Technical Field

The invention relates to the technical field of air conditioner products, in particular to a heat exchanger assembly and an air conditioner indoor unit.

Background

With the continuous promotion of the energy efficiency standard of air conditioners at home and abroad, how to improve the heat exchange efficiency of the heat exchanger of the air conditioner becomes the problem to be solved urgently. Among many solutions, it is an effective way to use a heat exchanger with high heat exchange efficiency in a completely new air conditioner or to replace a heat exchanger with low heat exchange performance of a mass-produced air conditioner with a heat exchanger with high heat exchange efficiency.

The prior air-conditioning heat exchanger with better heat exchange performance generally comprises a front heat exchanger, a middle heat exchanger and a rear heat exchanger which are arranged in a semi-surrounding manner, when the air-conditioning heat exchanger is in a refrigeration working condition, a refrigerant is divided into three paths by a three-way pipe and respectively enters the front heat exchanger, the middle heat exchanger and the rear heat exchanger for heat exchange, however, the front heat exchanger, the middle heat exchanger and the rear heat exchanger are limited by a rectangular space in an air-conditioning shell, the sizes of the front heat exchanger, the middle heat exchanger and the rear heat exchanger are different, so that the number of heat exchange tubes which can be arranged in each heat exchanger is also different, the size of the middle heat exchanger is often 2 times or more than that of the front heat exchanger or the rear heat exchanger, correspondingly, the number of the heat exchange tubes arranged in the middle heat exchanger is also far more than, the number of the heat exchange tubes passing through is far smaller than that of the heat exchange tubes passing through the refrigerant entering the middle heat exchanger, in other words, the refrigerant is likely to be discharged from the indoor heat exchanger after insufficient heat exchange when exchanging heat in the front heat exchanger or the rear heat exchanger, and the refrigerant is likely to be still continuously flowing through the heat exchange tubes after sufficient heat exchange when exchanging heat in the middle heat exchanger; in summary, the flow path design makes the heat exchange of the air-conditioning heat exchanger unbalanced, and reduces the energy efficiency of the air-conditioning heat exchanger.

Disclosure of Invention

The invention mainly aims to provide a heat exchanger assembly, aiming at improving the heat exchange balance of a middle heat exchanger, a front heat exchanger and a rear heat exchanger of a hollow heat exchanger in the prior art and improving the energy efficiency of an air conditioner heat exchanger.

To achieve the above object, the present invention provides a heat exchanger assembly comprising:

the main body heat exchanger is arranged in a semi-surrounding manner; the main heat exchanger comprises a front heat exchanger, a middle heat exchanger and a rear heat exchanger, wherein at least two rows of heat exchange tubes are arranged in the air inlet direction of the front heat exchanger, the middle heat exchanger and the rear heat exchanger, and the number of the heat exchange tubes of the middle heat exchanger is larger than that of the front heat exchanger and that of the rear heat exchanger; and

the back pipe heat exchanger is arranged on the windward side of the main body heat exchanger; wherein the content of the first and second substances,

when the heat exchanger assembly is used for refrigerating, a heat exchange flow path of the heat exchanger assembly is divided into a first branch, a second branch and a third branch after passing through the back pipe heat exchanger, and the first branch, the second branch and the third branch flow from a heat exchange pipe on the windward side of the main body heat exchanger to a heat exchange pipe on the leeward side; the first branch circuit flows through the heat exchange tube of the front heat exchanger, the second branch circuit flows through the heat exchange tube of the middle heat exchanger, the third branch circuit flows through the heat exchange tube of the rear heat exchanger, and at least one of the first branch circuit and the third branch circuit is arranged across the heat exchange tube of the middle heat exchanger.

Optionally, a difference between two heat exchange tubes through which the first branch, the second branch, and the third branch flow is less than or equal to 3.

Optionally, the front heat exchanger, the middle heat exchanger and the rear heat exchanger are all provided with two rows of heat exchange tubes, and the total number of the heat exchange tubes of the main heat exchanger is 18-22.

Optionally, the third branch flows through all heat exchange tubes of the rear heat exchanger, the second branch flows through part of the heat exchange tubes of the middle heat exchanger, and the first branch flows through the rest heat exchange tubes of the middle heat exchanger and all the heat exchange tubes of the front heat exchanger.

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

when the heat exchanger assembly is used for refrigerating, the first branch flows in from the second outer row, flows along the second outer row, enters the first outer row through a first crossover connection pipe, sequentially flows through the whole first outer row and the whole first inner row, and flows out from the first inner row; the second branch flows in from the second outer row, sequentially flows through the rest part of the second outer row and the whole second inner row, and flows out from the second inner row.

Optionally, the first branch flows in from the heat exchange tube in the middle of the second outer row, flows along the second outer row toward one side of the front heat exchanger, enters the heat exchange tube close to the middle heat exchanger in the first outer row through the first crossover pipe, sequentially flows through the whole first outer row and the first inner row, and flows out from the heat exchange tube close to the middle heat exchanger in the first inner row.

Optionally, the second branch flows in from a heat exchange tube adjacent to the heat exchange tube in which the first branch flows on the second outer row, flows along the second outer row toward one side of the rear heat exchanger, flows into the heat exchange tube close to the rear heat exchanger in the second inner row from the second outer row, flows along the second inner row toward one side of the front heat exchanger, and flows out from the heat exchange tube close to the front heat exchanger in the second inner row.

Optionally, the rear heat exchanger comprises a third inner row and a third outer row, the third outer row being located on the windward side of the main heat exchanger;

the third branch flows in from the heat exchange tube of the third outer row close to the middle heat exchanger, sequentially flows through the whole third outer row and the third inner row, and flows out from the heat exchange tube of the third inner row close to the middle heat exchanger.

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

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

Optionally, the back tube heat exchanger is disposed adjacent to the front heat exchanger relative to the rear heat exchanger.

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

The invention also provides an air-conditioning indoor unit, which comprises a heat exchanger assembly and a casing for accommodating the heat exchanger assembly, wherein the heat exchanger assembly comprises:

Optionally, a width dimension of the casing along the front-back direction is less than 800mm, and a height dimension of the casing along the up-down direction is less than 295 mm.

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

Optionally, when the heat exchanger assembly is disposed in the casing, an 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, the ends of the middle heat exchanger and the rear heat exchanger which are close to each other abut against each other; or

A gap is reserved between the ends, close to each other, of the middle heat exchanger and the rear heat exchanger, the indoor unit of the air conditioner further comprises a wind shield, and the wind shield is bridged between windward sides of the ends, close to each other, of the middle heat exchanger and the rear heat exchanger.

The heat exchanger component comprises a main heat exchanger and a back pipe heat exchanger arranged on the windward side of the main heat exchanger, wherein the main heat exchanger comprises a front heat exchanger, a middle heat exchanger and a back heat exchanger, when the heat exchanger component is used for refrigerating, a heat exchange flow path passing through the back pipe heat exchanger is divided into a first branch path, a second branch path and a third branch path, the first branch path flows through the front heat exchanger, the second branch path flows through the middle heat exchanger, the third branch path flows through the back heat exchanger, one of the first branch path and the third branch path strides over a heat exchange pipe of the middle heat exchanger, so that after the flow path is improved, a part of heat exchange pipes in the middle heat exchanger can be used for allowing refrigerants passing through the heat exchange pipes of the front heat exchanger or the back heat exchanger to continuously pass through, the situation that the refrigerant heat exchange pipes of the front heat exchanger or the back heat exchanger are only passed through by the first branch path or the, and the second branch only passes through the problem of structural waste (because the heat exchange tubes of the middle heat exchanger are more) which possibly occurs in the heat exchange tubes of the middle heat exchanger, and meanwhile, the heat exchange effects among the front heat exchanger, the rear heat exchanger and the middle heat exchanger are more balanced, so that the energy efficiency of the heat exchanger assembly is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an indoor unit of an air conditioner according to an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a first embodiment of a heat exchanger assembly of the present invention;

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

FIG. 4 is a schematic flow diagram of a third embodiment of a heat exchanger assembly of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Heat exchanger assembly	11	Front heat exchanger
111	First outer row	112	First inner row
				12	Middle heat exchanger	121	Second outer row
122	Second inner row	13	Rear heat exchanger
				131	Third outer row	132	Third inner row
14	Back tube heat exchanger	15	Dispenser
				16	Wind deflector	17	First crossover pipe
18	Second jumper tube	2	Heat exchange flow path
				21	First branch	22	Second branch
23	Third branch	24	First refrigerant manifold
				25	Second refrigerant header pipe	3	Casing (CN)
4	Cross flow wind wheel

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a heat exchanger assembly and an air conditioner indoor unit with the same.

In this embodiment, referring to fig. 1, the indoor unit of an air conditioner is a wall-mounted indoor unit of an air conditioner, and specifically includes a casing 3 and a cross-flow wind wheel 4 disposed in the casing 3, and certainly, the heat exchanger assembly 1 is also disposed in the casing 3 and located between an air inlet on the casing 3 and the cross-flow wind wheel 4, so as to exchange heat for air sucked by the cross-flow wind wheel 4. It is easy to understand that, in this embodiment, the side of the wall-mounted air conditioning indoor unit facing the user after being assembled is taken as the front, and the side facing the wall is taken as the rear, and the wall-mounted air conditioning indoor unit adopts a conventional operation mode of an upper air inlet and a lower air outlet, that is, 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, and in other embodiments, the air conditioning indoor unit may also be specifically a vertical indoor air conditioner or the like.

In an embodiment of the present invention, referring to fig. 1 to 4, the heat exchanger assembly 1 includes:

the main body heat exchanger is arranged around the cross flow wind wheel 4 in a semi-surrounding mode; the main heat exchanger comprises a front heat exchanger 11, a middle heat exchanger 12 and a rear heat exchanger 13, wherein the front heat exchanger 11, the middle heat exchanger 12 and the rear heat exchanger 13 are respectively provided with at least two rows of heat exchange tubes in the air inlet direction, and the number of the heat exchange tubes of the middle heat exchanger 12 is larger than that of the front heat exchanger 11 and the rear heat exchanger 13; and

a back pipe heat exchanger 14 mounted on the windward side of the main body heat exchanger;

in this embodiment, the front heat exchanger 11, the middle heat exchanger 12 and the rear heat exchanger 13 are provided with two rows of heat exchange tubes in the air inlet direction, which not only avoids insufficient heat exchange due to too few rows of heat exchange tubes, but also prevents waste of structure due to too many heat exchange tubes; of course, in other embodiments, in order to meet different heat exchange requirements of the heat exchangers, three or even four rows of heat exchange tubes may be arranged in the air intake direction, and the design is not limited thereto. Specifically, the heat exchange tubes of the front heat exchanger 11 include a first outer row 111 and a first inner row 112, the heat exchange tubes of the middle heat exchanger 12 include a second outer row 121 and a second inner row 122, the heat exchange tubes of the rear heat exchanger 13 include a third outer row 131 and a third inner row 132, and the first outer row 111, the second outer row 121 and the third outer row 131 are all located on the windward side of the main heat exchanger. It is easy to understand that the back pipe heat exchanger 14 is additionally arranged on the windward side of the main body heat exchanger so as to enhance the heat exchange capability of the heat exchanger assembly 1, and the back pipe heat exchanger 14 is arranged on the windward side of the middle heat exchanger 12 with the largest windward area so as to maximize the energy efficiency of the back pipe heat exchanger without losing generality. Particularly, a gap should be avoided as much as possible between the ends of the middle heat exchanger 12 and the rear heat exchanger 13 close to each other, in this embodiment, the gap is limited to a special casing size of the indoor unit of the air conditioner, and a gap is reserved between the ends of the middle heat exchanger 12 and the rear heat exchanger 13 close to each other, so as to avoid that air entering from an air inlet directly enters the cross flow wind wheel 4 without passing through the heat exchanger assembly 1, in this embodiment, a wind shield 16 is further bridged between the windward sides of the middle heat exchanger 12 and the rear heat exchanger 13; for example, but not limited to, two ends of the wind shield 16 are respectively attached to the middle heat exchanger 12 and the rear heat exchanger 13 through sponges, so that the wind shield 16 is connected with the heat exchangers, the sealing performance of the contact part of the wind shield 16 and the heat exchangers is guaranteed, and the sponge attaching mode is also beneficial for a user to detach the wind shield 16 when the heat exchanger assembly 1 needs to be repaired or replaced; of course, in other embodiments, the wind deflector 16 may be mounted to the middle heat exchanger 12 and the rear heat exchanger 13 by screw locking, and the design is not limited thereto. If a large gap exists between the front heat exchanger 11 and the middle heat exchanger 12, a wind screen 16 may be additionally arranged between the front heat exchanger and the middle heat exchanger to avoid air leakage of the heat exchanger assembly 1.

It can be understood that the heat exchange cycle system of the air conditioner includes an outdoor heat exchanger, a compressor, etc. in addition to the heat exchanger assembly 1 located indoors. In this embodiment, the back tube heat exchanger 14 is connected to the main body heat exchanger at one end and to the first refrigerant manifold 24 at the other end, and the first refrigerant manifold 24 is used to connect to the outdoor heat exchanger.

In this embodiment, referring to fig. 1 to 4, when the heat exchanger assembly 1 is used for refrigeration, a refrigerant sent by a compressor firstly exchanges heat through an outdoor heat exchanger, then enters the back tube heat exchanger 14 through the first refrigerant header pipe 24, and is divided into a first branch 21, a second branch 22 and a third branch 23 after passing through the back tube heat exchanger 14, and the first branch 21, the second branch 22 and the third branch 23 all flow from a heat exchange tube on the windward side of the main body heat exchanger to a heat exchange tube on the leeward side; the first branch 21 and the second branch 22 share all heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12, at least one of the first branch 21 and the second branch 22 is arranged across the heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12, the third branch 23 flows through all the heat exchange tubes of the rear heat exchanger 13, and the first branch 21, the second branch 22 and the third branch 23 are converged in a second refrigerant header 25 after flowing out of the main heat exchanger and flow back to the compressor; when the heat exchanger assembly 1 heats, the refrigerant sent by the compressor firstly enters the heat exchanger assembly 1 through the second refrigerant header pipe 25, respectively flows through the first branch 21, the second branch 22 and the third branch 23 to complete heat exchange, then is collected and flows through the back pipe heat exchanger 14, then enters the outdoor heat exchanger through the first refrigerant header pipe 24 to exchange heat, and finally flows back to the compressor. It should be noted that the design is not limited to this, and in other embodiments, the first branch 21 flows through all the heat exchange tubes of the front heat exchanger 11, the second branch 22 and the third branch 23 share all the heat exchange tubes of the middle heat exchanger 12 and the rear heat exchanger 13, and at least one of the second branch 22 and the third branch 23 is disposed across the heat exchange tubes of the middle heat exchanger 12 and the rear heat exchanger 13. Without loss of generality, when the heat exchanger assembly 1 performs cooling, the refrigerant passes through the tube-backed heat exchanger 14 and then is divided into the first branch 21, the second branch 22, and the third branch 23 by the distributor 15.

Firstly, for the flow path design of the heat exchanger assembly 1 in this embodiment, it should be understood that, under the cooling condition, the flow direction principle of the heat exchange tube from the outer side (windward side) to the inner side (leeward side) is adopted on each of the first branch 21, the second branch 22 and the third branch 23, so as to improve the heat exchange temperature difference and improve the heat exchange efficiency to the maximum extent, and table 1 contrasts and analyzes the influence of the flow path of the heat exchanger assembly 1 gradually entering the inner side heat exchange tube from the outer side heat exchange tube under the cooling condition and the flow path of other forms on the APF (energy efficiency ratio).

TABLE 1

As can be seen from a comparison of the correspondence between the different flow path forms and the APF in table 1, the flow path form in which the three paths of the heat exchange tubes flow from the outer side to the inner side is the most energy efficient.

In order to solve the technical problem mentioned in the background art that the difference between the number of heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12 is large due to the size limitation of the casing 3, and the refrigerant exchanges heat with the front heat exchanger 11 and the middle heat exchanger 12 respectively, so that the heat exchange is unbalanced and the energy efficiency is low, in the present embodiment, the flow path design of the heat exchanger 12 assembly 1 further emphasizes that the first branch 21 and the second branch 22 share the heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12, and at least one of the first branch 21 and the second branch 22 is arranged to be bridged between the heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12, i.e. the flow path is not limited to only flow through the front heat exchanger 11 or the middle heat exchanger 12, but is connected in series with part of the heat exchange tubes of the front heat exchanger 11 or the middle heat exchanger 12 And an improvement in energy efficiency thereof.

In this embodiment, the difference between the numbers of the heat exchange tubes flowing through the first branch 21 and the second branch 22 is controlled to be less than or equal to 3, so as to avoid that the difference between the heat exchange efficiency of the two is too large, which affects the heat exchange balance between the front heat exchanger 11 and the middle heat exchanger 12. Particularly, the difference value between every two of the numbers of the heat exchange tubes flowing through the first branch 21, the second branch 22 and the third branch 23 is controlled to be less than or equal to 3, so that the heat exchange balance among the front heat exchanger 11, the middle heat exchanger 12 and the rear heat exchanger 13 can be realized, and the overall energy efficiency of the heat exchanger assembly 1 is improved.

In daily life, due to different designs of a user on a home space, related requirements are often provided for the size of a casing 3 of a wall-mounted air conditioner indoor unit, in the embodiment, the width dimension L of the casing 3 in the front-back direction is less than 800mm, and the height dimension H of the casing 3 in the up-down direction is less than 295 mm; for the heat exchanger assembly 1 which is adapted to the size of the casing 3, the total number of the heat exchange tubes in the main body heat exchanger is set to be 18-22 so as to ensure that the heat exchanger assembly 1 maintains high energy efficiency in a limited installation space, and particularly, in the embodiment, the number of the heat exchange tubes in the main body heat exchanger is 20. In addition, the cross-flow wind wheel 4 is limited in the casing 3 with the size range, the energy efficiency and the space occupation of the cross-flow wind wheel 4 are comprehensively considered, the diameter D of the cross-flow wind wheel 4 is selected to be 115 mm-125 mm, the distance S between the inner side surface of the main heat exchanger and the outer side surface of the cross-flow wind wheel 4 is kept to be larger than 10mm, in order to ensure that the main heat exchanger semi-surrounds the cross-flow wind wheel 4, the effect of better improving the heat exchange energy efficiency and the reliable design of condensation and drainage can be achieved, the included angle between the rear heat exchanger 13 and the vertical direction is kept to be 38-48 degrees, and the included angle between the middle heat exchanger 12 and the front.

The heat exchanger component 1 comprises a main heat exchanger and a back tube heat exchanger 14 arranged on the windward side of the main heat exchanger, wherein the main heat exchanger comprises a front heat exchanger 11, a middle heat exchanger 12 and a back heat exchanger 13, when the heat exchanger component 1 is used for refrigerating, a heat exchange flow path 2 passing through the back tube heat exchanger 14 is divided into a first branch path 21, a second branch path 22 and a third branch path 23, the first branch path 21 flows through the front heat exchanger 11, the second branch path 22 flows through the middle heat exchanger 12, the third branch path 23 flows through the back heat exchanger 13, and one of the first branch path 21 and the third branch path 23 spans through a heat exchange tube of the middle heat exchanger 12, so that after the flow path is improved, a part of heat exchange tubes in the middle heat exchanger 12 can be used for allowing a refrigerant passing through the heat exchange tubes of the front heat exchanger 11 or the back heat exchanger 13 to continuously pass through, and the situation that the refrigerant possibly has insufficient heat exchange through the heat exchange tube of the first branch path 21 Less heat exchange tubes are arranged in the front heat exchanger 11 and the rear heat exchanger 13), and the problem of structural waste (due to more heat exchange tubes of the middle heat exchanger 12) which may occur when the second branch 22 passes through the heat exchange tubes of the middle heat exchanger 12 only, can be solved, and meanwhile, the heat exchange effects among the front heat exchanger 11, the rear heat exchanger 12 and the middle heat exchanger 13 are more balanced, and the energy efficiency of the heat exchanger assembly is effectively improved.

As is well known, the use of the heat exchange tube with a small diameter can reduce the material consumption of the heat exchange tube, so as to significantly reduce the overall cost of the heat exchanger assembly 1, but when the refrigerant passes through the heat exchange tube with a small diameter, the heat exchange resistance is large, the pressure loss is large, and the refrigerant is not beneficial to the circulating flow of the refrigerant. In the embodiment, the cost of the heat exchanger assembly 1 and the circulating flow efficiency of the refrigerant are comprehensively considered, and the diameter of the heat exchange tube of the back tube heat exchanger 14 is set to be larger than that of the heat exchange tube of the main body heat exchanger, so that when the heat exchanger assembly 1 is used for refrigerating, the refrigerant firstly enters the large-diameter heat exchange tube of the back tube heat exchanger 14 and then flows into the small-diameter heat exchange tube of the main body heat exchanger, namely, the contact area between the refrigerant and the heat exchange tube is correspondingly increased in the process of changing the refrigerant from a gas state to a liquid state; when the heat exchanger component 1 heats, the refrigerant is firstly shunted in the small-pipe-diameter heat exchange pipe of the main heat exchanger for heat exchange, and then enters the large-pipe-diameter heat exchange pipe of the back pipe heat exchanger 14 in a gathering manner, and table 2 contrasts and analyzes the influence of the flowing mode of the refrigerant in different pipe diameters on the APF under the heating condition of the heat exchanger component 1.

TABLE 2

Comparing the correspondence between different flow path forms and APFs in table 2, it can be seen that the energy efficiency of the flow mode of passing the refrigerant through the heat exchange tube with small pipe diameter and then through the heat exchange tube with large pipe diameter is the highest in the present embodiment under the heating condition. Without loss of generality, the heat exchange tube of the back tube heat exchanger 14 has a tube diameter of phi 7, while the heat exchange tube of the main body heat exchanger has a tube diameter of phi 5, and it can be understood that the heat exchange tubes with the tube diameters of phi 7 and phi 5 are widely used in the prior art, so that the heat exchange tubes with the two tube diameters are selected, the acquisition difficulty of the heat exchange tubes is favorably reduced, and the manufacturing cost of the heat exchanger assembly 1 is reduced; of course, in other embodiments, the heat exchange tubes of the back tube heat exchanger 14 and the main body heat exchanger may also be of other tube diameter sizes, for example, the heat exchange tube of the back tube heat exchanger 14 may also be of a tube diameter of phi 6, and the design is not limited thereto. In addition, in this embodiment, compromise the energy efficiency demand of heat exchanger subassembly and the size restriction of casing 3, the heat exchange tube quantity of back tube heat exchanger 14 is preferred 2 ~ 4, and in order to make back tube heat exchanger 14 better ground the air intake setting on the casing 3, makes back tube heat exchanger 14 be close to the front heat exchanger setting relatively back heat exchanger.

Further, referring to fig. 1 to 4, the second branch 22 flows through a part of the heat exchange tubes of the middle heat exchanger 12, and the first branch 21 flows through the remaining heat exchange tubes of the middle heat exchanger 12 and all the heat exchange tubes of the front heat exchanger 11. It can be understood that, with such an arrangement, under the condition that the heat exchange tubes through which the first branch 21 and the second branch 22 pass are ensured to be close, the design of the flow path can be simplified as much as possible, so as to reduce the production difficulty of the main heat exchanger. It should be noted that the design is not limited to this, and in other embodiments, the second branch 22 flows through part of the heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12, and the first branch 21 flows through the remaining heat exchange tubes of the front heat exchanger 11 and the middle heat exchanger 12.

The following describes a specific flow path design of the main heat exchanger, taking the heat exchanger assembly 1 in a refrigeration condition as an example, in a first embodiment of the present invention:

referring to fig. 2, the first branch 21 flows in from the heat exchange tube in the middle of the second outer row 121, flows toward one side of the front heat exchanger 11 along the second outer row 121 and enters the first outer row 111 through the first crossover pipe 17, and flows through the entire first outer row 111 and the first inner row 112 in sequence, and flows out from the first inner row 112; the second leg 22 flows in from the second outer row 121, flows through the remainder of the second outer row 121, and the entire second inner row 122 in that order, and flows out from the second inner row 122. It can be understood that the first branch 21 flows to the heat exchange tube of the intermediate heat exchanger 12 closest to the front heat exchanger 11 and then enters the front heat exchanger 11 through the first crossover pipe 17, which is beneficial to reducing the length of the first crossover pipe 17 and the gap between the front heat exchanger 11 and the intermediate heat exchanger 12. Specifically, the first branch 21 passes through two heat exchange tubes of the second outer row 121 and then enters the front heat exchanger 11 through the first crossover tube 17. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may also flow into the heat exchange tubes at other positions of the second outer row 121.

Further, the second bypass 22 flows in from the heat exchange tube adjacent to the heat exchange tube into which the first bypass 21 flows on the second outer row 121, and flows toward the side of the rear heat exchanger 13 along the second outer row 121. It will be appreciated that the first and

second legs

21 and 22 respectively flow along opposite sides of the second outer row 121 to share the heat exchange tubes of the second outer row 121, and thus the arrangement is such that the second leg 22 is prevented from having to change its flow direction in order to flow out of the heat exchange tubes of the second outer row 121, i.e. the flow direction of the second leg 22 is simplified. Specifically, the second branch 22 passes through three heat exchange tubes of the second outer row 121 and then enters the second inner row 122. It should be noted that the design is not limited thereto, and in other embodiments, the second leg 22 flows in from the rearmost heat exchange tube of the second outer row 121 and flows along the second outer row 121 toward the side of the front heat exchanger 11 to a heat exchange tube adjacent to the heat exchange tube in which the first leg 21 flows in on the second outer row 121.

Further, the first branch 21 enters the heat exchange tube of the first outer row 111 close to the middle heat exchanger 12 through the first crossover pipe 17, and flows through the whole first outer row 111 and the first inner row 112 in sequence, and then flows out from the heat exchange tube of the first inner row 112 close to the middle heat exchanger 12. It can be understood that, with such an arrangement, the first branch 21 flows in from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is adapted to the higher energy of the refrigerant in the first branch 21 at this time, so as to better achieve heat exchange of the refrigerant, and the flow path design in the front heat exchanger 11 is also simplified in a manner that the first branch 21 flows from top to bottom to the first outer row 111 and from bottom to top to the first inner row 112. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may enter the front heat exchanger 11 from other heat exchange tubes of the first outer row 111, or exit the front heat exchanger 11 from other heat exchange tubes of the first inner row 112.

Further, the second branch 22 flows into the heat exchange tubes of the second inner row 122 close to the rear heat exchanger 13 from the second outer row 121, flows toward the side of the front heat exchanger 11 along the second inner row 122, and flows out of the heat exchange tubes of the second inner row 122 close to the front heat exchanger 11. It can be understood that, with this arrangement, the second branch 22 always keeps flowing forward, and the flow direction design is simple, which is beneficial to reducing the processing difficulty of the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the second branch 22 may also flow into other heat exchange tubes of the second inner row 122 from the second outer row 121, or flow out of other heat exchange tubes of the second inner row 122 to the middle heat exchanger 12.

Further, the third branch 23 flows in from the heat exchange tubes of the third outer row 131 adjacent to the middle heat exchanger 12, flows through the entire third outer row 131 and the third inner row 132 in sequence, and flows out from the heat exchange tubes of the third inner row 132 adjacent to the middle heat exchanger 12. It can be understood that, with such an arrangement, the third branch 23 flows in from the upper end of the windward side of the rear heat exchanger 13, and the air volume at this position is adapted to the higher energy of the refrigerant in the third branch 23 at this time, so as to better achieve heat exchange of the refrigerant, and the flow path design in the rear heat exchanger 13 is also simplified in a manner that the third branch 23 flows from top to bottom to the third outer row 131 and from bottom to top to the third inner row 132. It should be noted that the design is not limited thereto, and in other embodiments, the third branch 23 may also enter the rear heat exchanger 13 from other heat exchange tubes of the third outer row 131, or exit the rear heat exchanger 13 from other heat exchange tubes of the third inner row 132.

Based on the specific flow path design of the main heat exchanger in the embodiment, the influence of the distribution mode of the number of heat exchange tubes in the three branches on the APF is analyzed in table 3.

TABLE 3

Comparing the corresponding relationship between the distribution mode of the number of the heat exchange tubes and the APF in the table 3, it can be known that the scheme that the first branch 21 passes through 6 heat exchange tubes, the second branch 22 passes through 7 heat exchange tubes and the third branch 23 passes through 7 heat exchange tubes is preferably adopted, so that the energy efficiency of the heat exchanger assembly 1 is the highest; with this arrangement, the difference between the numbers of the first branch 21 and the second branch 22 passing through the heat exchange tube is 1, the difference between the numbers of the first branch 21 and the third branch 23 passing through the heat exchange tube is 1, and the difference between the numbers of the second branch 22 and the third branch 23 passing through the heat exchange tube is 0, which obviously conforms to the previous limitation that the difference between the numbers of the two branches passing through the heat exchange tubes is less than or equal to 3 in order to improve the energy efficiency of the heat exchanger assembly 1.

In a second embodiment of the invention:

referring to fig. 3, the first branch 21 flows in from the second outer row 121 close to the heat exchange tubes of the front heat exchanger 11, flows along the second outer row 121 toward one side of the front heat exchanger 11, enters the first outer row 111 through the first crossover pipe 17, sequentially flows through the whole first outer row 111 and the first inner row 112, enters the second inner row 122 through the second crossover pipe 18, and flows out from the second inner row 122; the second leg 22 flows in from the second outer row 121, flows through the second outer row 121 and the remainder of the second inner row 122 in that order, and flows out from the second inner row 122. It can be understood that the first branch 21 flows to the heat exchange tube of the intermediate heat exchanger 12 closest to the front heat exchanger 11 and then enters the front heat exchanger 11 through the first crossover pipe 17, which is beneficial to reducing the length of the first crossover pipe 17 and the gap between the front heat exchanger 11 and the intermediate heat exchanger 12. Specifically, the first branch 21 passes through one heat exchange tube in the second outer row 121 and then enters the front heat exchanger 11 through the first crossover tube 17. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may also flow into the heat exchange tubes at other positions of the second outer row 121.

second legs

21 and 22 respectively flow along opposite sides of the second outer row 121 to share the heat exchange tubes of the second outer row 121, and thus the arrangement is such that the second leg 22 is prevented from having to change its flow direction in order to flow out of the heat exchange tubes of the second outer row 121, i.e. the flow direction of the second leg 22 is simplified. Specifically, the second branch 22 passes through four heat exchange tubes of the second outer row 121 and then enters the second inner row 122. It should be noted that the design is not limited thereto, and in other embodiments, the second leg 22 flows in from the rearmost heat exchange tube of the second outer row 121 and flows along the second outer row 121 toward the side of the front heat exchanger 11 to a heat exchange tube adjacent to the heat exchange tube in which the first leg 21 flows in on the second outer row 121.

Further, the first branch 21 enters the heat exchange tubes of the first outer row 111 close to the middle heat exchanger 12 through the first crossover pipe 17, and sequentially flows through the whole first outer row 111 and the first inner row 112, reaches the heat exchange tubes of the first inner row 112 close to the middle heat exchanger 12, and then enters the second inner row 122 through the second crossover pipe 18. It can be understood that, with such an arrangement, the first branch 21 flows in from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is adapted to the higher energy of the refrigerant in the first branch 21 at this time, so as to better implement the heat exchange of the refrigerant, and the first branch 21 flows through the first outer row 111 from top to bottom and flows through the first inner row 112 from bottom to top, so as to simplify the flow path design in the front heat exchanger 11, and in addition, the first branch 21 enters the middle heat exchanger 12 from the heat exchange tube of the front heat exchanger 11 close to the middle heat exchanger 12 through the second jumper tube 18, which is also beneficial to reducing the length of the second jumper tube 18 and the gap between the front heat exchanger 11 and the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may also enter the front heat exchanger 11 from other heat exchange tubes of the first outer row 111, or enter the middle heat exchanger 12 from other heat exchange tubes of the first inner row 112 via the second jumper tube 18.

Further, the first branch 21 enters the heat exchange tubes of the second inner row 122 close to the front heat exchanger 11 through the second jumper tubes 18, flows along the second inner row 122 toward one side of the rear heat exchanger 13, and flows out from the heat exchange tubes in the middle of the second inner row 122. It will be appreciated that the arrangement in which the first branch 21 enters from the second inner row 122 adjacent to the heat exchange tubes of the front heat exchanger 11 facilitates the reduction in the length of the second jumper tube 18 and the clearance between the front heat exchanger 11 and the intermediate heat exchanger 12. Specifically, the first branch 21 passes through two heat exchange tubes in the second inner row 122 and then is discharged out of the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may enter the middle heat exchanger 12 from other heat exchange tubes of the second inner row 122, or exit the middle heat exchanger 12 from other heat exchange tubes of the second inner row 122.

Further, the second branch 22 flows into the heat exchange tubes of the second inner row 122 close to the rear heat exchanger 13 from the second outer row 121, flows toward the side of the front heat exchanger 11 along the second inner row 122, and flows out from the heat exchange tubes adjacent to the heat exchange tubes flowing out of the first branch 21. It can be understood that, with this arrangement, the second branch 22 can always flow forward after entering the second inner row 122, and the flow direction design is simple, which is beneficial to reducing the processing difficulty of the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the second branch 22 may also flow into other heat exchange tubes of the second inner row 122 from the second outer row 121, or flow out of other heat exchange tubes of the second inner row 122 to the middle heat exchanger 12.

Based on the specific flow path design of the main heat exchanger in the embodiment, the influence of the distribution mode of the number of heat exchange tubes in the three branches on the APF is analyzed in table 4.

TABLE 4

Comparing the corresponding relationship between the distribution mode of the number of the heat exchange tubes and the APF in the table 4, it can be known that the scheme that the first branch 21 passes through 8 heat exchange tubes, the second branch 22 passes through 6 heat exchange tubes and the third branch 23 passes through 7 heat exchange tubes is preferably adopted, so that the energy efficiency of the heat exchanger assembly 1 is the highest; with this arrangement, the difference between the numbers of the first branch 21 and the second branch 22 passing through the heat exchange tubes is 2, the difference between the numbers of the first branch 21 and the third branch 23 passing through the heat exchange tubes is 1, and the difference between the numbers of the second branch 22 and the third branch 23 passing through the heat exchange tubes is 1, which obviously conforms to the previous limitation that the difference between the numbers of the two branches passing through the heat exchange tubes is less than or equal to 3 in order to improve the energy efficiency of the heat exchanger assembly 1.

In a third embodiment of the invention:

referring to fig. 4, the first branch 21 flows in from the heat exchange tube of the first outer row 111 close to the middle heat exchanger 12, sequentially flows through the whole first outer row 111 and the first inner row 112, reaches the heat exchange tube of the first inner row 112 close to the middle heat exchanger 12, then enters the second inner row 122 through the second jumper tube 18, and flows out from the second inner row 122; the second leg 22 flows in from the second outer row 121, flows through the entire second outer row 121, and the remainder of the second inner row 122 in that order, and flows out from the second inner row 122. It can be understood that, with such an arrangement, the first branch 21 flows in from the upper end of the windward side of the front heat exchanger 11, and the air volume at this position is adapted to the higher energy of the refrigerant in the first branch 21 at this time, so as to better realize the heat exchange of the refrigerant, and the first branch 21 is flowed from top to bottom to the first outer row 111 and flowed from bottom to top to the first inner row 112, so that the flow path design in the front heat exchanger 11 is also simplified, and in addition, the second branch 22 does not need to span into the front heat exchanger 11, which is beneficial to reducing the difficulty of the flow path design. It should be noted that the design is not limited thereto, and in other embodiments, the first branch 21 may also flow from other heat exchange tubes of the first outer row 111, or from other heat exchange tubes of the first inner row 112 into the second inner row 122 through the second jumper tube 18.

Further, the second leg 22 flows in from the heat exchange tubes of the second outer row 121 adjacent the front heat exchanger 11, flows along the second outer row 121 to the heat exchange tubes of the second outer row 121 adjacent the rear heat exchanger 13, and flows into the second inner row 122. It can be understood that, with such an arrangement, the second branch 22 can flow through the heat exchange tubes of the whole second outer row 121 without changing the flow direction when the second outer row 121 flows, and the flow path is simple, which is beneficial to reducing the processing difficulty of the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the second legs 22 flow in from the heat exchange tubes of the second outer row 121 adjacent the rear heat exchanger 13, along the second outer row 121 to the heat exchange tubes of the second outer row 121 adjacent the front heat exchanger 11, and then into the second inner row 122.

Further, the second branch 22 flows into the heat exchange tubes of the second inner row 122 close to the rear heat exchanger 13 from the second outer row 121, flows toward one side of the front heat exchange tubes along the second inner row 122, and flows out from the heat exchange tubes adjacent to the heat exchange tubes flowing out of the first branch 21. The second branch 22 always flows forward after entering the second inner row 122, and the flow direction design is simple, which is beneficial to reducing the processing difficulty of the middle heat exchanger 12. It should be noted that the design is not limited thereto, and in other embodiments, the second branch 22 may also flow into other heat exchange tubes of the second inner row 122 from the second outer row 121, or flow out of other heat exchange tubes of the second inner row 122 to the middle heat exchanger 12.

Further, the third branch 23 flows in from the heat exchange tube of the third outer row 131 close to the middle heat exchanger 12, and flows through the whole third outer row 131 and the third inner row 132 in sequence, and then flows out from the heat exchange tube of the third inner row 132 close to the middle heat exchanger 12. It can be understood that, with such an arrangement, the third branch 23 flows in from the upper end of the windward side of the rear heat exchanger 13, and the air volume at this position is adapted to the higher energy of the refrigerant in the third branch 23 at this time, so as to better achieve heat exchange of the refrigerant, and the flow path design in the rear heat exchanger 13 is also simplified in a manner that the third branch 23 flows from top to bottom to the third outer row 131 and from bottom to top to the third inner row 132. It should be noted that the design is not limited thereto, and in other embodiments, the third branch 23 may also enter the rear heat exchanger 13 from other heat exchange tubes of the third outer row 131, or exit the rear heat exchanger 13 from other heat exchange tubes of the third inner row 132.

Based on the specific flow path design of the main heat exchanger in the embodiment, the influence of the distribution mode of the number of heat exchange tubes in the three branches on the APF is analyzed in table 5.

TABLE 5

Comparing the corresponding relationship between the distribution mode of the number of the heat exchange tubes and the APF in the table 5, it can be known that the scheme that the first branch 21 passes through 7 heat exchange tubes, the second branch 22 passes through 7 heat exchange tubes and the third branch 23 passes through 7 heat exchange tubes is preferably adopted, so that the energy efficiency of the heat exchanger assembly 1 is the highest; with this arrangement, the difference between the numbers of the first branch 21 and the second branch 22 passing through the heat exchange tubes is 0, the difference between the numbers of the first branch 21 and the third branch 23 passing through the heat exchange tubes is 0, and the difference between the numbers of the second branch 22 and the third branch 23 passing through the heat exchange tubes is 0, which obviously conforms to the previous limitation that the difference between the numbers of the two branches passing through the heat exchange tubes is less than or equal to 3 in order to improve the energy efficiency of the heat exchanger assembly 1.

The present invention further provides an air conditioner, which includes an outdoor unit and an indoor unit, and the specific structure of the indoor unit of the air conditioner refers to the above embodiments.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides a heat exchanger subassembly for machine in air conditioning, its characterized in that includes:

2. The heat exchanger assembly of claim 1, wherein the difference between two of the numbers of heat exchange tubes through which the first, second and third legs each flow is less than or equal to 3.

3. The heat exchanger assembly as claimed in claim 2, wherein the front heat exchanger, the middle heat exchanger and the rear heat exchanger are each provided with two rows of heat exchange tubes, and the main heat exchanger has 18 to 22 heat exchange tubes in total.

4. The heat exchanger assembly of claim 1, wherein the third leg flows through all of the heat exchange tubes of the rear heat exchanger, the second leg flows through a portion of the heat exchange tubes of the middle heat exchanger, and the first leg flows through the remaining heat exchange tubes of the middle heat exchanger and all of the heat exchange tubes of the front heat exchanger.

5. The heat exchanger assembly of claim 4, wherein the heat exchange tubes of the front heat exchanger comprise a first outer row and a first inner row, and the heat exchange tubes of the middle heat exchanger comprise a second outer row and a second inner row, the first outer row and the second outer row being located on a windward side of the main heat exchanger;

6. The heat exchanger assembly of claim 5, wherein said first leg flows in from the heat exchange tube in the middle of said second outer row and along said second outer row toward one side of said front heat exchanger, and then enters the heat exchange tube of said first outer row adjacent to said middle heat exchanger through said first crossover duct, and flows through the entire first outer row and first inner row in turn, and then flows out from the heat exchange tube of said first inner row adjacent to said middle heat exchanger.

7. The heat exchanger assembly of claim 6, wherein the second leg flows in from a heat exchange tube adjacent to the heat exchange tube in which the first leg flows in on the second outer row, along the second outer row toward the side of the rear heat exchanger, into the heat exchange tube of the second inner row adjacent to the rear heat exchanger from the second outer row, along the second inner row toward the side of the front heat exchanger, and out from the heat exchange tube of the second inner row adjacent to the front heat exchanger.

8. The heat exchanger assembly of claim 4, wherein the rear heat exchanger includes a third inner row and a third outer row, the third outer row being on a windward side of the body heat exchanger;

9. The heat exchanger assembly as claimed in any one of claims 1 to 8, wherein the heat exchange tube diameter of the back tube heat exchanger is greater than the heat exchange tube diameter of the main body heat exchanger.

10. The heat exchanger assembly of claim 9, wherein the tube-backed heat exchanger is mounted on a windward side of the intermediate heat exchanger.

11. The heat exchanger assembly of claim 10, wherein the back tube heat exchanger is disposed proximate the front heat exchanger relative to the rear heat exchanger.

12. The heat exchanger assembly as claimed in claim 9, wherein the number of the heat exchange tubes of the back tube heat exchanger is 2-4.

13. An indoor unit of an air conditioner, comprising the heat exchanger assembly as recited in any one of claims 1 to 12, and a casing for accommodating the heat exchanger assembly.

14. The indoor unit of claim 13, wherein a width dimension of the casing in a front-rear direction is less than 800mm, and a height dimension of the casing in an up-down direction is less than 295 mm.

15. The indoor unit of an air conditioner as claimed in claim 13, wherein when the heat exchanger assembly is installed in the cabinet, an angle between the arrangement direction of the rear heat exchanger and the up-down direction is in a range of 38 ° to 48 °.

16. The indoor unit of an air conditioner as claimed in claim 13, wherein when the heat exchanger assembly is installed in the casing, an included angle between the arrangement direction of the middle heat exchanger and the front heat exchanger and the up-down direction is in a range of 45 ° to 55 °.

17. An indoor unit of an air conditioner according to claim 13, wherein ends of the intermediate heat exchanger and the rear heat exchanger adjacent to each other abut against each other; or