KR20210092625A - Indoor unit for Airconditioner - Google Patents

Abstract

The present invention relates to an indoor unit of an air conditioner, which comprises: a heat exchange assembly having a plurality of heat exchange units arranged vertically along an air outlet to exchange heat with indoor air and a refrigerant; and a plurality of blower fans which are arranged vertically along the outlet, and at least one blower fan is arranged for each heat exchange unit. The heat exchange assembly includes a refrigerant inlet pipe, a refrigerant connecting pipe, and a refrigerant outlet pipe. The heat exchange units are connected in series with each other. Accordingly, even if the blower fan is partially operated, the cooling and heating efficiency is maintained.

Description

{Indoor unit for Airconditioner}

The present invention relates to an indoor unit of an air conditioner, and more particularly, to an indoor unit of an air conditioner including a discharge port, an indoor heat exchanger, and a plurality of blowing fans.

In general, an air conditioner is a device that cools or heats a room using a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger. The air conditioner may include two assemblies of an outdoor unit and an indoor unit. The double outdoor unit is installed outside and includes a compressor and an outdoor heat exchanger. The indoor unit is installed indoors and includes an indoor heat exchanger.

The indoor heat exchanger cools or heats the indoor air by exchanging the refrigerant with the indoor air. Recently, in order to improve heat exchange efficiency, air conditioners using microchannel heat exchangers are increasing.

The heat exchanger may be divided into the microchannel type heat exchanger and the fin-tube type heat exchanger. The fin-tube heat exchanger is made of copper, and the microchannel heat exchanger is made of aluminum. In terms of efficiency, the microchannel type heat exchanger is more efficient than the fin-tube type heat exchanger because a fine flow path is formed inside.

However, in terms of ease of manufacture, the microchannel heat exchanger is manufactured through brazing by putting it into a furnace. Fin-tube heat exchangers are manufactured by welding fins and tubes. Therefore, the fin-tube type heat exchanger can be manufactured in various sizes as needed, but the microchannel type heat exchanger has a disadvantage in that it cannot be manufactured exceeding the maximum manufacturing size of the furnace.

Recent air conditioners have a tendency to increase the suction area in order to improve cooling and heating performance. Accordingly, in the prior art, the suction part is formed up and down, and microchannel heat exchangers are arranged up and down to have a sufficient heat exchange area. 1 is a view showing a heat exchanger according to the prior art. Referring to FIG. 1 , in the prior art, a heat exchanger is disposed up and down, and a blower fan is disposed up and down to correspond to the heat exchanger. In the prior art, the refrigerant is switched to flow in parallel to the upper heat exchanger and the lower heat exchanger, respectively.

On the other hand, recent air conditioners install a plurality of blowing fans for efficient operation, but secure a power saving function by varying the number of blowing fans.

However, in the prior art, since the pipes are connected in parallel, and when only the blowing fan on one side is operated, the refrigerant circulates in the heat exchanger on the other side without heat exchange, there is a problem of impairing cooling and heating efficiency. For example, when only the upper blowing fan is operated without operating the lower blowing fan for power saving, the refrigerant passing through the lower heat exchanger circulates without heat exchange, so that the cooling/heating efficiency is impaired.

If, in the prior art, in order to solve the above problems, there is a problem that the refrigerant pipe must be individually controlled in addition to the individual control of the blowing fan.

SUMMARY OF THE INVENTION An object of the present invention is to provide an indoor unit of an air conditioner that maintains cooling/heating efficiency even when only some blowing fans are operated in a plurality of heat exchangers.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an indoor unit of an air conditioner according to an embodiment of the present invention includes: a plurality of outlets arranged vertically; a heat exchanging assembly having a plurality of heat exchanging units arranged vertically along the outlet to exchange heat with indoor air and refrigerant; It is disposed at the front end or the rear end of the heat exchange unit, and a plurality of air blow fans are disposed vertically along the toe and x spheres, and at least one blower fan is disposed for each heat exchange unit. The heat exchange assembly includes: a refrigerant inlet pipe connected to one heat exchange unit disposed below among the heat exchange units; a refrigerant connection pipe connecting a plurality of heat exchange units; and a refrigerant discharge pipe connected to a heat exchange unit to which a refrigerant inlet pipe is not connected, wherein the heat exchange units are connected in series with each other.

The heat exchange unit is manufactured in a microchannel type, and includes a plurality of flat tubes having flow paths formed therein; Fins that connect between flat tubes and conduct heat; a lower header connected to the lower ends of the plurality of flat tubes; an upper header connected to the top of the plurality of flat tubes; It may further include a baffle disposed on the lower header and partitioning the inner space of the lower header. The refrigerant inlet pipe, the refrigerant connection pipe, or the refrigerant discharge pipe may be connected to the lower header.

The blowing fan may individually turn on/off a plurality of blowing fans to selectively discharge air to a plurality of outlets.

At least two heat exchange units are stacked up and down, and may be arranged to overlap at least two or more front and rear.

According to an embodiment of the present invention, the refrigerant may circulate through all heat exchange units disposed below and then circulate through all heat exchange units disposed above.

According to another embodiment of the present invention, the refrigerant may circulate through all the heat exchangers disposed above and then circulate through the heat exchangers disposed below.

The details of other embodiments are included in the detailed description and drawings.

According to the indoor unit of the air conditioner of the present invention, there are one or more of the following effects.

First, since the heat exchangers are connected in series, the refrigerant circulates through all the indoor heat exchangers, and even if only a part of the blower fan operates, all the refrigerants exchange heat with the indoor air, thereby maintaining the cooling and heating performance.

Second, especially in the case of the second embodiment, since the refrigerant flowing into the lower heat exchanger flows through the upper heat exchangers and finally discharged to the lower heat exchanger, there is also an advantage in that the upper-lower temperature deviation is reduced.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a diagram schematically showing an indoor heat exchanger according to the prior art;
2 is a perspective view of the air conditioner;
3 is an exploded perspective view of the air conditioner of FIG. 1;
4 is a right sectional view of the air conditioner of FIG. 1;
5 is a view showing a heat exchange assembly according to a first embodiment of the present invention;
6 is a view showing the heat exchange assembly according to the first embodiment separated into a first heat exchanger and a second heat exchanger;
7 is a view showing the first heat exchanger according to the first embodiment separated into a first heat exchange part and a second heat exchange part;
8 is a front cross-sectional view of a first heat exchanger according to the first embodiment;
9 is a front cross-sectional view of a second heat exchanger according to the first embodiment;
10 is a view showing a heat exchange assembly according to a second embodiment of the present invention;
11 is a view showing the heat exchange assembly according to the second embodiment separated into a first heat exchanger and a second heat exchanger;
12 is a view showing the first heat exchanger according to the second embodiment separated into a first heat exchange part and a second heat exchange part;
13 is a front cross-sectional view of a first heat exchanger according to the second embodiment;
14 is a front cross-sectional view of a second heat exchanger according to the second embodiment;
15 is a view showing the second heat exchanger according to the second embodiment separated into a third heat exchange part and a fourth heat exchange part;
16 is a front cross-sectional view of a third heat exchanger according to the second embodiment;
17 is a front cross-sectional view of a fourth heat exchanger according to the second embodiment;
18 is a diagram illustrating the temperature of the air discharged from the blowing fan measured for each section according to the second embodiment.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, the present invention will be described with reference to the drawings for explaining an indoor unit of an air conditioner according to embodiments of the present invention.

The front is the direction in which the door is arranged in the air conditioner. The back is the opposite of the front. The upward direction is the upward direction of the air conditioner. The downward direction is the downward direction of the air conditioner as opposed to the upward direction. The left room is the direction to the left when looking at the air conditioner from the front. The right side is the direction to the right when looking at the air conditioner from the front.

Indoor air flows into the intake port disposed on the rear surface and flows forward.

Based on the air flow direction, the heat exchanger disposed at the rear has the same meaning as the heat exchanger disposed upstream, and the heat exchanger disposed at the front has the same meaning as the heat exchanger disposed downstream.

The air conditioner includes an outdoor unit (not shown) that is disposed outdoors to exchange heat with a refrigerant and external air, and radiates heat of the refrigerant to the outside, and is disposed indoors to exchange heat with the refrigerant and indoor air, and to absorb internal heat. Includes indoor unit.

The air conditioner includes a compressor for compressing a refrigerant, an outdoor heat exchanger installed outdoors to exchange heat with outdoor air and a refrigerant, an expansion device for expanding a refrigerant, and an indoor heat exchanger installed indoors to exchange heat with indoor air and refrigerant.

A compressor (not shown) compresses the incoming low-temperature-low pressure refrigerant into high-temperature-high pressure refrigerant. The compressor is generally disposed in an outdoor unit. The compressor may have various structures, and may be a reciprocating compressor using a cylinder and a piston or a scroll compressor using an orbiting scroll and a fixed scroll.

The compressor guides the high-temperature and high-pressure refrigerant to the outdoor heat exchanger.

An accumulator may be disposed in the refrigerant inflow direction of the compressor. The accumulator is a device for preventing damage to the compressor by preventing excessive refrigerant from flowing into the compressor.

An outdoor heat exchanger (not shown) is disposed in the outdoor space and exchanges heat with the outdoor air between the high-temperature and high-pressure refrigerant supplied from the compressor. The outdoor heat exchanger acts as a condenser that cools and condenses the refrigerant. The outdoor heat exchanger is disposed in the outdoor unit. The outdoor heat exchanger cools the refrigerant of high temperature and high pressure and discharges it as the refrigerant of low temperature and high pressure. The low-temperature-high-pressure refrigerant discharged from the outdoor heat exchanger flows to the expansion valve.

The expansion valve (not shown) is a device for discharging low-temperature-low-pressure refrigerant by expanding the first refrigerant. The expansion valve may be disposed in the outdoor unit or the indoor unit. Preferably, the expansion valve may be disposed in the outdoor unit in order to reduce noise of the indoor unit and to reduce the size of the indoor unit. During the cooling operation, the expansion valve is completely opened to allow the refrigerant to pass through, so the low-temperature-high-pressure refrigerant discharged from the outdoor heat exchanger is discharged in a cryogenic-low pressure state. The low-temperature-low-pressure refrigerant discharged from the expansion valve flows to the indoor heat exchanger.

An indoor heat exchanger is a device that exchanges heat with a low-temperature-low pressure refrigerant and indoor air, and absorbs heat from the indoor air to cool the indoor air. The indoor heat exchanger is disposed in the indoor unit. The indoor heat exchanger acts as an evaporator that evaporates the refrigerant during cooling operation. The refrigerant discharged from the indoor heat exchanger flows back to the compressor.

The above-described refrigerant cycle of the air conditioner has been described based on the cooling operation. The air conditioner according to the present invention is capable of heating operation if necessary, and becomes a heating operation when the refrigerant flow is reversed.

2 is a view showing the indoor unit 1 of the air conditioner according to the present invention, and FIG. 3 is an exploded perspective view of the indoor unit 1 of the air conditioner according to the present invention.

The indoor unit 1 includes a cabinet 10 having an open front and a suction port formed at the rear. A door 20 for opening and closing the inner space of the cabinet 10 is disposed in front of the cabinet 10 . A blower fan is disposed inside the cabinet 10 to discharge air from the internal space of the cabinet 10 to the room. Heat exchange assemblies 100 and 200 for exchanging the sucked indoor air and refrigerant are disposed. A humidifier 60 for providing moisture to the interior space of the cabinet 10 is disposed. It is disposed at the inlet and includes a filter 40 for filtering air flowing into the interior space of the cabinet 10 . It moves in the vertical direction along the filter 40 and includes a moving cleaner 50 that separates and collects foreign substances in the filter 40 .

The indoor unit 1 sucks air through an inlet formed on the rear surface of the cabinet 10 . The sucked air is heated or cooled while exchanging heat with the refrigerant in the heat exchange assemblies 100 and 200 . At this time, moisture may be supplied from the humidifier 60 . The heated or cooled air is discharged into the room through the outlets 31 and 32 by the blower fan.

The door 20 is coupled to the front surface of the cabinet 10 and may be slidably moved in the left and right directions.

The door 20 may be moved in any one of the left and right directions to open the inner space of the cabinet 10 . In addition, the door 20 may be moved in any one of the left or right direction to open only a part of the inner space.

The filter 40 is disposed at the rear of the cabinet 10 . The filter 40 may be rotated toward the side of the cabinet 10 in a state in which it is disposed on the rear side of the cabinet 10 . The user can separate the filter 40 rotated to the side.

The filter 40 consists of two parts, each of which can be rotated left or right.

The moving cleaner 50 is a device for cleaning the filter 40 . The moving cleaner 50 can clean the filter 40 while moving in the vertical direction. The moving cleaner 50 may suck air while moving, and at the same time separate and collect foreign substances filtered by the filter 40 .

The moving cleaner 50 is installed in a structure that is not indirectly caused when the filter 40 is rotated.

The humidifier 60 is a device that provides moisture to the inner space of the cabinet 10 , and the provided moisture may be discharged into the room through a blower fan. The humidifier 60 includes a detachable water tank (not shown).

Referring to FIG. 3 , the humidifier 60 may be disposed below the interior of the cabinet 10 . The heat exchange assemblies 100 and 200 and the blowing fan may be disposed on the humidifier 60 .

The discharge ports 31 and 32 are openings through which air heated or cooled inside the cabinet 10 is discharged to the outside of the indoor unit. According to the present invention, a plurality of outlets 31 and 32 may be formed.

The discharge ports 31 and 32 are disposed in the cabinet 10 . The discharge ports 31 and 32 may be formed on one side of the cabinet 10 . The discharge ports 31 and 32 may be formed in the door 20 . In addition to the cabinet 10 or the door 20 , the discharge ports 31 and 32 may be formed in a frame that forms the exterior of the indoor unit.

The discharge ports 31 and 32 may be formed in a circular shape as formed in the door 20 or may be formed in a rectangular shape as formed on the side surface of the indoor unit. The shape of the discharge port is not limited to the shape shown in the drawings, and may be changed within a range that can be easily changed based on a person skilled in the art.

The discharge port 31 formed on the front side may be disposed on the door 20 , and in more detail, may be disposed on the upper side of the door 20 . An axial fan may be disposed in the air inflow direction of the discharge port 31 formed on the front side. Air is discharged toward the front from the discharge port 31 formed on the front side. The discharge port 31 formed on the front side strongly discharges air forward, and may be referred to as a remote discharge port.

The discharge port 32 formed on the side is disposed in the side cabinet 10 . A centrifugal fan may be disposed in the air inflow direction of the discharge port 32 formed on the side surface. Referring to FIG. 3 , the fan casing 76 on which the blowing fan is installed may constitute a side surface of the indoor unit, and in this case, the outlet 32 may be formed on the side surface of the fan casing 76 . The discharge port 32 formed on the side may be an opening extending up and down. Alternatively, the discharge port 32 formed on the side may form seven openings as shown in FIG. 3 . The number of outlets 32 formed on the side is not limited to seven, and may be increased/decreased.

The discharge port 32 formed on the side may be disposed on the left and right sides, respectively.

A discharge vane (not shown) capable of controlling the discharge direction of air may be disposed at the side discharge port 32 .

The air sucked through the cabinet 10 passes through the heat exchange assemblies 100 and 200 orthogonally, and then flows to the blowing fan. The plurality of blowing fans may be individually turned on/off, and selectively discharging air to the plurality of outlets.

The blowing fan may be classified into a long-distance blowing fan 71 and a short-distance blowing fan 72 to 74.

Blowing fans are arranged on the same plane and stacked in a line with respect to the vertical direction.

A plurality of outlets 31 and 32 are disposed above and below the cabinet 10 , and a plurality of blowing fans are disposed vertically along the outlets 31 and 32 .

A remote blowing fan 71 disposed on the uppermost side may be disposed at a position corresponding to the discharge port 31 formed on the front side. A plurality of short-distance blower fans 72 to 74 may be disposed vertically to correspond to the outlet 32 formed on the side surface.

Referring to FIG. 4 , the blowing fan may be disposed to correspond to the heat exchange assemblies 100 and 200 . The heat exchange assemblies 100 and 200 are disposed vertically. A second short-distance blowing fan 73 and a third short-distance blowing fan 74 may be disposed at positions corresponding to the first heat exchange units 110 and 210 and the second heat exchange units 120 and 220 disposed on the lower side. A long-distance blowing fan 71 and a first short-distance blowing fan 72 may be disposed at positions corresponding to the third heat exchange units 130 and 230 and the fourth heat exchange units 140 and 240 disposed on the upper side, that is, the third heat exchange unit. The air heat-exchanged in 130 and 230 and the fourth heat exchange unit 140 and 240 is discharged to the outside by the long-distance blowing fan 71 and the first short-distance blowing fan 72, and the first heat exchange unit 110 and 210 and the second heat exchange unit The air heat-exchanged at 120 and 220 is discharged to the outside by the second short-distance blowing fan 73 and the third short-distance blowing fan 74 .

The remote blowing fan 71 is a component for discharging air to the front of the cabinet 10 . The air discharged from the remote blowing fan 71 provides direct air to the user. The remote blower fan 71 discharges air to a far place in the room to improve the circulation of indoor air.

The remote blower fan 71 may be disposed at the front of the heat exchange assemblies 100 and 200 or disposed at the rear. However, it is preferable to dispose in front of the heat exchange assemblies 100 and 200 in order to discharge air to a distant place.

Referring to FIG. 4 , the long-distance blowing fan 71 may be disposed above the short-distance blowing fans 72 to 74 . The long-distance blower fan 71 may be stacked on the upper side of the short-distance blower fan 72-74. The long-distance blower fan 71 may be stacked to protrude forward than the short-distance blower fans 72 to 74. However, the present invention is not limited thereto, and the long-distance blowing fan 71 and the short-distance blowing fan 72 to 74 may be arranged in a line when viewed from the side.

The remote blowing fan 71 may control the discharge direction of air in various directions.

The short-distance blower fans 72 to 74 are components for discharging air laterally with respect to the cabinet 10 . Air discharged from the short-distance blower fans 72 to 74 is discharged in the lateral direction of the cabinet 10 . The air discharged from the short-distance blower fans 72 to 74 provides indirect air to the user.

Referring to FIG. 4 , the short-distance blower fans 72 to 74 may be disposed below the long-distance blower fan 71 . The short-distance blower fans 72 to 74 may be disposed at the front of the heat exchange assemblies 100 and 200 as shown in FIG. 3 , or may be disposed at the rear, although not shown. Based on the air flow direction, the short-distance blower fans 72 to 74 may be disposed downstream of the heat exchange assemblies 100 and 200 as shown in FIG. 3 , and although not shown, disposed upstream of the heat exchange assemblies 100 and 200 . could be

The short-distance blowing fans 72 to 74 are installed by stacking a plurality of fans in the vertical direction. In this embodiment, three blowing fans are stacked in the vertical direction. However, the number of blowing fans is not limited, and may be increased or decreased based on those skilled in the art.

In the present invention, the short-distance blower fans 72 to 74 are centrifugal fans. A centrifugal fan sucks in air in an axial direction and discharges air in a radial direction. More specifically, the short-distance blower fans 72 to 74 suck air from the rear and then discharge the air in the radial direction.

The short-distance blowing fans 72 to 74 may be installed in the fan casing 76 . The pan casing 76 may be formed with front and rear openings. The fan casing 76 may include a fan guide 77 for guiding the air discharged from the short-distance blower fans 72 to 74 in the lateral direction of the cabinet 10 .

The fan casing 76 may be manufactured in the form of a box with an open front or back.

The fan casing 76 may be coupled to the cabinet 10 . A front side of the fan casing 76 may be disposed to face the door 20 , and a rear side thereof may be disposed to face the heat exchange assemblies 100 and 200 .

The front of the fan casing 76 may be closed in close contact with the door 20 .

The side surface of the fan casing 76 may be exposed to the side surface of the indoor unit to form an external shape. In this case, the outlet 32 may be formed on the side of the fan casing 76 . A discharge vane for controlling the discharge direction of air may be disposed in the side discharge port 32 .

<Heat Exchange Assembly>

The heat exchange assemblies 100 and 200 are components that exchange heat between a refrigerant circulating inside the heat exchange assembly and air passing through the outside of the heat exchange assembly.

The heat exchange assemblies 100 and 200 according to the present invention are configured by stacking a plurality of separately manufactured micro-channel type heat exchangers. The heat exchange assembly may include a first heat exchanger disposed at a lower portion and a second heat exchanger disposed at an upper portion of the first heat exchanger, and the first heat exchanger and the second heat exchanger have refrigerant connection pipes 160 and 260 through which refrigerant flows to each other. do.

The first heat exchanger and the second heat exchanger may be vertically disposed.

The heat exchange assemblies 100 and 200 may form one of the first heat exchanger and the second heat exchanger as a parallel flow and the other as a counter flow.

Parallel flow refers to a case in which the flow direction of the refrigerant passing through the heat exchanger is the same as the flow direction of the air. For example, a case in which the refrigerant flows from the second heat exchangers 120 and 220 disposed upstream to the first heat exchangers 110 and 210 disposed downstream is referred to as parallel flow.

Counterflow refers to a case in which the flow direction of the refrigerant passing through the heat exchanger is different from the flow direction of the air. For example, a case in which the refrigerant flows from the first heat exchangers 110 and 210 disposed downstream to the second heat exchangers 120 and 220 disposed upstream is referred to as counterflow.

Since the heat exchange assemblies 100 and 200 according to the present invention cover a large suction port formed on the rear surface through the stacked first and second heat exchangers, it can sufficiently cope with an enlarged suction port area.

The indoor air heat-exchanged in the heat exchange assemblies 100 and 200 is discharged to the outside by a blower fan. In more detail, the air that has passed through the third heat exchange unit 130,230 and the fourth heat exchange unit 140,240 disposed above is discharged to the outside by the remote blowing fan 71 or the first short-range blowing fan 72, The air that has passed through the first heat exchange units 110 and 210 and the second heat exchange units 120 and 220 disposed below is discharged to the outside by the second short-range blowing fan 73 or the third short-range blowing fan 74 .

Hereinafter, the basic structure of the heat exchanger will be described with reference to FIGS. 6 to 9 .

The basic structure of the heat exchanger includes the first heat exchangers 110 and 120 of the first embodiment, the second heat exchangers 130 and 140 of the first embodiment, and the second heat exchange of the second embodiment among the heat exchangers constituting the heat exchange assembly 100 and 200 to be described later. It can be applied to the groups 230 and 240, but cannot be applied to the first heat exchangers 210 and 220 of the second embodiment. Hereinafter, the first heat exchangers 110 and 120 of the first embodiment will be described as an example, and the description of the second heat exchangers 130 and 140 of the first embodiment and the second heat exchangers 230 and 240 of the second embodiment will be omitted.

The first heat exchangers 110 and 120 according to the first embodiment are stacked in the front and rear directions on the first heat exchange unit 110 and the first heat exchange unit 110 that exchange heat with air and the second heat exchange unit 120 that exchanges heat with air. includes Meanwhile, in the present invention, one heat exchanger is configured with two heat exchange parts, but it may be configured with two or more heat exchange parts based on those skilled in the art.

At least two or more heat exchange units may be stacked up and down, and may be arranged to overlap at least two in front and rear. According to the present invention, two heat exchangers may be disposed to overlap back and forth in one heat exchanger, and two heat exchangers may be stacked up and down in one heat exchange assembly. Accordingly, four heat exchange units may be disposed in one heat exchange assembly, and the four heat exchange units may be overlapped in front and rear and stacked up and down.

The first heat exchange unit 110 and the second heat exchange unit 120 are microchannel type heat exchangers. The first heat exchange part and the second heat exchange part 120 are formed of an aluminum material. The first heat exchange unit 110 and the second heat exchange unit 120 are integrally manufactured in the furnace.

The first heat exchange unit 110 includes a plurality of first flat tubes 111 having a plurality of flow paths formed therein, a first fin 112 connecting the first flat tubes 111 to each other to conduct heat, and a plurality of The first lower header 113 coupled to one side of the plurality of first flat tubes 111 and communicating with one side of the plurality of first flat tubes 111 through which the refrigerant flows, and the plurality of first flat tubes 111 . and a first upper header 114 coupled to the other side and communicating with the other side of the plurality of first flat tubes 111 through which the refrigerant flows. It may include a first baffle 116 that is formed on at least one of the first lower header 113 and the first upper header 114 and partitions the inside so that the refrigerant does not flow.

A flow path is formed in the first flat tube 111 extending long in the longitudinal direction to flow the refrigerant. The first flat tube 111 may be vertically extended and disposed, and a plurality of first flat tubes 111 may be stacked in the left and right directions.

A plurality of flow paths are formed inside the first flat tube 111 . The refrigerant flows along the longitudinal direction of the first flat tube 111 .

The lower end of the first flat tube 111 is inserted into the first lower header 113 to communicate. The upper end of the first flat tube 111 is inserted into the first upper header 114 to communicate.

The first fin 112 is formed by bending, and connects the two stacked first flat tubes 111 to each other to conduct heat. The first fin 112 has an effect of more easily exchanging heat with air by increasing the surface area, and also has the effect of increasing heat exchange efficiency by reducing the temperature deviation between the first flat tubes 111 .

Refrigerant pipes are connected to the first lower header 113 . The refrigerant pipe means a refrigerant inlet pipe 150 , a refrigerant connection pipe 160 , and a refrigerant discharge pipe 170 .

The first lower header 113 may form one or more connecting portions to be connected to the refrigerant pipes. When the first lower header 113 is partitioned by the first baffle 116, only one connection portion is formed in each partitioned lower header. The connection part may be formed below the lower header as shown in the drawings, but is not limited thereto and may be formed on the side.

The first upper header 114 is connected to the upper ends of the first flat tubes 111 . When the first lower header 113 is partitioned by the first baffle 116, the refrigerant is supplied to the first upper header 114 in the first path 110a, and the supplied refrigerant is the second path 110b. is emitted as

Similarly, the second heat exchange unit 120 is provided with a second flat tube 121 and a second fin 122, and a second lower header 123 is disposed at the lower end of the second flat tube 121, A second upper header 124 is disposed on the upper end. In addition, the third heat exchange unit 130 is provided with a third flat tube 131 and a third fin 132, a third lower header 133 is disposed at the lower end of the third flat tube 131, the upper end The third upper header 134 is disposed. In addition, the fourth heat exchange unit 140 is provided with a fourth flat tube 141 and a fourth fin 142, a fourth lower header 143 is disposed at the lower end of the fourth flat tube 141, the upper end The fourth upper header 144 is disposed.

The first baffle 116 is a component that partitions the inner space of the first lower header 113 or the first upper header 114 . The first baffle 116 may be installed anywhere in the first lower header 113 or the first upper header 114 . However, referring to FIGS. 5 and 10 , since the pipes according to the present invention are connected to the first lower header 113 , the first baffle 116 is connected to the first lower header 113 to circulate all heat exchangers. It is preferable to form

The first baffle 116 is disposed on the first lower header 113 to divide the inner space of the first lower header 113 into two spaces. As the first lower is divided into two spaces according to the first baffle 116 , the first flat tube 111 may also be divided into two groups. For convenience, the right side of the first heat exchange part 110 is called a first path 110a, and the left side of the first heat exchange part 110 is called a second path 110b. That is, the refrigerant passing through the first path 110a passes through the second path 110b via the first upper header 114 . Accordingly, the refrigerant flow direction of the first path 110a and the refrigerant flow direction of the second path 110b are always opposite to each other.

Similarly, the second heat exchange unit 120 to the fourth heat exchange unit 140 may also be divided into two groups. The second heat exchange unit 120 may be divided into a third path 120a and a fourth path 120b by the second baffle 126 . The third heat exchange unit 130 may be divided into a fifth pass 130a and a sixth pass 130b by the third baffle 136 . The fourth heat exchange unit 140 may be divided into a seventh pass 140a and an eighth pass 140b by the fourth baffle 146 .

The communication holes 117 and 127 are components that connect the first heat exchange unit 110 and the second heat exchange unit 120 . Referring to FIG. 7 , a first communication hole 117 is formed at the lower left side of the first heat exchange unit 110 , and a second communication hole 127 is formed at the lower left side of the second heat exchange unit 120 corresponding thereto. can be formed. A first communication hole 117 may be formed on the rear side of the left side 113b of the first lower header, and a second communication hole 127 may be formed on the front side of the left side 123b of the second lower header corresponding thereto.

Communication holes 117 and 127 are respectively formed on opposite surfaces of the first lower header 113 and the second lower header 123 .

A plurality of first communication holes 117 may be disposed in the longitudinal direction of the first lower header 113 . A plurality of second communication holes 127 may be disposed in the longitudinal direction of the second lower header 123 .

When the refrigerant flows from the second path 110b disposed in the first heat exchange unit 110 to the fourth path 120b disposed in the second heat exchange unit 120, the second heat exchange is performed through the communication holes 117 and 127. flow to section 120 .

Similarly, the third heat exchange unit 130 and the fourth heat exchange unit 140 may also have a communication hole. That is, the communication hole 137 may be formed at the lower left side of the third heat exchange unit 130 , and the communication hole 147 may be formed at the lower left side of the fourth heat exchange unit 140 corresponding thereto. When the refrigerant flows from the sixth pass 130b disposed in the third heat exchange unit 130 to the eighth pass 140b disposed in the fourth heat exchange unit 140, the refrigerant flows to another heat exchange unit through the communication holes 137 and 147. can move

<First embodiment>

Hereinafter, the heat exchange assembly 100 according to the first embodiment will be described with reference to FIGS. 5 to 9 .

Referring to FIG. 5 , in the heat exchange assembly 100 according to the first embodiment, the refrigerant circulates through all heat exchange units disposed below and then circulates through all heat exchange units disposed above. That is, instead of the refrigerant branching and passing through the upper heat exchange unit and the lower heat exchange unit separately as in the prior art, all the refrigerants pass through all the lower heat exchange units and then pass through all the upper heat exchange units. Therefore, even if only some of the blowing fans are operated, all the refrigerants exchange heat to maintain the cooling and heating efficiency.

The heat exchange assembly 100 may include first heat exchangers 110 and 120 disposed below and second heat exchangers 130 and 140 disposed above. The first heat exchangers 110 and 120 are composed of a first heat exchange unit 110 disposed downstream and a second heat exchange unit 120 disposed upstream, and the second heat exchangers 130 and 140 are a third heat exchanger disposed downstream. It may be composed of the unit 130 and the fourth heat exchange unit 140 disposed upstream. The first heat exchange unit 110 includes a first pass 110a on the right and a second pass 110b on the left, and the second heat exchange unit 120 includes a third pass 120a on the right and a fourth pass on the left. It is composed of a path 120b, the third path 120a is composed of a fifth path 130a on the right side and a sixth path 130b on the left side, and the fourth path 120b is a seventh path 140a on the right side. ) and the eighth path 140b on the left.

In each heat exchange unit, refrigerant flows into one side of the lower header, flows through one side of the flat tube, flows through the upper header, flows through the other side flat tube, and flows through the other side of the lower header and is discharged. For example, in the first heat exchange unit 110 according to the first embodiment of FIG. 5 , the refrigerant flows into the right side 113a of the first lower header, flows through the right flat tube 111a, and the first upper The header 114 flows, the left flat tube 111b flows, flows to the left side 113b of the first lower header, and then is discharged.

The connection part 115 is a component to which the refrigerant pipe is fastened. The connection part 115 may be disposed on the lower header. The connection part 115 may be disposed in a lower header or an upper header. However, in the heat exchange unit, since the refrigerant pressure on the refrigerant supply side is relatively large and the refrigerant pressure on the refrigerant discharge side is relatively small, it is preferable to form an ascending passage on the refrigerant supply side and a descending passage on the refrigerant discharge side. Therefore, it is preferable to be formed in the connection part ?z lower header.

The first connection part 115 may be disposed at a lower end of one side of the first heat exchange part 110 . The first connection part 115 may be disposed at the lower end of the first path 110a. The first connection part 115 may be disposed at a lower end of the first lower header 113 . A refrigerant inlet pipe 150 may be connected to the first connection part 115 .

The second connection part 125 may be disposed at a lower end of one side of the second heat exchange part 120 . The second connection part 125 may be disposed at the lower end of the third path 120a. The second connection part 125 may be disposed at a lower end of the second lower header 123 . One side of the refrigerant connection pipe 160 may be connected to the second connection part 125 .

The third connection part 135 may be disposed at the lower end of one side of the third heat exchange part 130 . The third connection part 135 may be disposed at the lower end of the fifth path 130a. The third connection part 135 may be disposed at the lower end of the third lower header 133 . The other side of the refrigerant connection pipe 160 may be connected to the third connection part 135 .

The fourth connection part 145 may be disposed at the lower end of one side of the fourth heat exchange part 140 . The fourth connection part 145 may be disposed at the lower end of the seventh path 140a. The fourth connection part 145 may be disposed at a lower end of the fourth lower header 143 . A refrigerant discharge pipe 170 may be connected to the fourth connection part 145 .

Referring to FIG. 5 , the first connection part 115 to the fourth connection part 145 are disposed at the lower end of one side of the lower header, but the present invention is not limited thereto.

The first connection part 115 may be disposed on the left side of the second connection part 125 . The third connection part 135 may be disposed on the left side of the fourth connection part 145 . Therefore, when each heat exchange part is loaded back and forth, each connection part can be arrange|positioned without collision.

The left lower end of the first heat exchange unit 110 and the left lower end of the second heat exchange unit 120 form connection holes 117 and 127, respectively, so that the refrigerant can circulate. The lower left end of the third heat exchange unit 130 and the lower left end of the fourth heat exchange unit 140 form connection holes 137 and 147, respectively, so that the refrigerant can circulate.

According to the first embodiment, the flow order of the refrigerant may be changed depending on which connection part of the first heat exchange unit 110 to the fourth heat exchange unit 140 the refrigerant pipe is arranged.

The refrigerant inlet pipe 150 may be connected to a heat exchange unit disposed below the downstream. The refrigerant inlet pipe 150 may be connected to the lower right side of the first heat exchange unit 110 . During the cooling operation, a cold refrigerant flows into the first heat exchange unit 110 through the refrigerant inlet pipe 150 , and the refrigerant having a higher temperature in the refrigerant passing through the first heat exchange unit 110 is converted into a second heat exchange unit 120 . is introduced into Accordingly, the sucked air is primarily cooled by the refrigerant having a higher temperature in the second heat exchange unit 120 and is formed into a counterflow that is secondarily cooled by the refrigerant having a lower temperature in the first heat exchange unit 110 . Therefore, there is an advantage in that the cooling performance is further improved. Similarly, since the third heat exchange unit 130 and the fourth heat exchange unit 140 are also formed in a counter flow, there is an advantage in that the cooling performance is further improved.

A connection hole 117 may be formed on the rear side of the left side 113b of the first lower header, and a corresponding connection hole 127 may be formed on the front side of the left side 123b of the second lower header. Since the connection holes communicate with each other, the refrigerant passing through the second path 110b flows into the fourth path 120b.

The refrigerant connection pipe 160 may be connected between the heat exchange unit disposed below the upstream and the heat exchange unit disposed above the downstream. One side of the refrigerant connection pipe 160 is connected to the second connection part 125 , and the other side is connected to the third connection part 135 . The refrigerant connection pipe 160 connects the heat exchange unit disposed below and the heat exchange unit disposed above in series so that all refrigerants circulate through all heat exchange units.

Since the refrigerant connection pipe 160 uses only one refrigerant connection pipe 160 unlike the second embodiment to be described later, there is an advantage in that the pipe structure is simple.

The refrigerant connection pipe 160 may connect the lower end of one side of the heat exchange unit disposed below the upstream and the lower end of the same side of the heat exchange unit disposed above the downstream. More specifically, the refrigerant connection pipe 160 may connect the lower right side of the second heat exchange unit 120 and the lower right side of the third heat exchange unit 130 . Since the refrigerant connection pipe 160 connects the same side of the second heat exchange unit 120 and the third heat exchange unit 130 , the second heat exchangers 130 and 140 also flow countercurrently, similarly to the first heat exchangers 110 and 120 . There is an advantage in that the cooling performance is further improved.

The refrigerant discharge pipe 170 may be connected to a heat exchange unit disposed above the upstream. The refrigerant discharge pipe 170 may be disposed at the lower right side of the fourth heat exchange unit 140 .

The refrigerant inlet pipe 150 is disposed in the heat exchange unit located below, and the refrigerant discharge pipe 170 is arranged in the heat exchange unit located above. Since the refrigerant inlet pipe 150 and the refrigerant outlet pipe 170 are spaced apart from each other, the possibility of heat exchange between each other is reduced, thereby maintaining the cooling performance.

In the heat exchange assembly 100 according to the first embodiment, the refrigerant is, the refrigerant inlet pipe 150 - the first pass (110a) - the second pass (110b) - the fourth pass (120b) - the third pass (120a)- The refrigerant connection pipe 160 - the fifth pass (130a) - the sixth pass (130b) - the eighth pass (140b) - the seventh path (140a) - passes through the refrigerant discharge pipe 170 in order.

In the heat exchange assembly 100 according to the first embodiment, since both the first heat exchangers 110 and 120 and the second heat exchangers 130 and 140 are formed in counter flow, heat exchange performance is improved.

In addition, unlike the second embodiment, the heat exchange assembly 100 according to the first embodiment uses only one connecting pipe 160 , so that the exposed pipe structure is simplified.

In addition, in the heat exchange assembly 100 according to the first embodiment, since the first heat exchangers 110 and 120 and the second heat exchangers 130 and 140 are symmetrical, it is sufficient to manufacture only one type of heat exchanger. There is an advantage in that it is easier to manufacture than the heat exchange assembly 200 according to the present invention.

<Second embodiment>

Hereinafter, the heat exchange assembly 200 according to the second embodiment will be described with reference to FIGS. 10 to 17 .

The heat exchange assembly 200 according to the second embodiment may be used in a range that does not conflict with the heat exchange assembly 100 according to the first embodiment described above. Hereinafter, the heat exchange assembly 200 according to the second embodiment will be described with a focus on differences from the heat exchange assembly 100 according to the first embodiment.

Referring to FIG. 10 , in the heat exchange assembly 200 according to the second embodiment, all heat exchange units disposed above are circulated and then heat exchange units disposed below are circulated. In more detail, the heat exchange unit 210 disposed below is first circulated, and the heat exchange units 230 and 240 disposed above are circulated, and then the remaining heat exchange units 240 disposed below are circulated last. That is, instead of the refrigerant branching and passing separately through the upper heat exchange unit and the lower heat exchange unit as in the prior art, all the refrigerant first passes through some heat exchange units at the lower side, and then passes through all the heat exchange units at the upper side, pass through the heat exchanger. Therefore, even if only some of the blowing fans are operated, all the refrigerants exchange heat to maintain the cooling and heating efficiency.

Referring to FIG. 11 , the heat exchange assembly 200 may include first heat exchangers 210 and 220 disposed below and second heat exchangers 230 and 240 disposed above. Referring to FIG. 12 , the first heat exchangers 210 and 220 include a first heat exchanger 210 disposed downstream and a second heat exchanger 220 disposed upstream, and the second heat exchangers 230 and 240 are downstream It may be composed of a third heat exchange unit 230 disposed in the and a fourth heat exchange unit 240 disposed upstream. The first heat exchange unit 210 includes a first pass 210a on the right and a second pass 210b on the left, and the second heat exchange unit 220 includes a third pass 220a on the right and a fourth pass 210b on the left. It is composed of a path 220b, the third path 220a is composed of a fifth path 230a on the right and a sixth path 230b on the left side, and the fourth path 220b is a seventh path 240a on the right side. ) and the eighth path 240b on the left.

In each heat exchange unit, refrigerant flows into one side of the lower header, flows through one side of the flat tube, flows through the upper header, flows through the other side flat tube, and flows through the other side of the lower header and is discharged. For example, in the first heat exchange unit 210 according to the second embodiment of FIG. 10 , the refrigerant flows into the right side 213a of the first lower header, flows through the right flat tube 211a, and the first upper The header 214 flows, the left flat tube 211b flows, flows to the left side 213b of the first lower header, and then is discharged.

The connection part is a component to which the refrigerant pipe is fastened. The connection part may be disposed on the lower header.

The first connection part 215 may be disposed at the lower end of one side of the first heat exchange part 210 . The first connection part 215 may be disposed at a lower end of the first lower header 213 . The first connection part 215 may include a 1a connection part 215a disposed at a lower end of the first path 210a and a 1b connection part 215b disposed at a lower end of the second path 210b. The refrigerant inlet pipe 250 may be connected to the 1a connection part 215a. A first refrigerant connection pipe 261 may be connected to the 1b connection part 215b.

The second connection part 225 may be disposed at the lower end of one side of the second heat exchange part 220 . The second connection part 225 may be disposed at a lower end of the second lower header 223 . The second connection part 225 may include a 2a connection part 225a disposed at a lower end of the third path 220a and a 2b connection part 225b disposed at a lower end of the fourth path 220b. A refrigerant discharge pipe 270 may be connected to the second a connection part 225a. The other side of the second refrigerant connection pipe 262 may be connected to the 2b connection part 225b.

The third connection part 235 may be disposed at the lower end of one side of the third heat exchange part 230 . The third connection part 235 may be disposed at the lower end of the fifth path 230a. The third connection part 235 may be disposed at a lower end of the third lower header 233 . The other side of the first refrigerant connection pipe 261 may be connected to the third connection part 235 .

The fourth connection part 245 may be disposed at the lower end of one side of the fourth heat exchange part 240 . The fourth connection part 245 may be disposed at the lower end of the seventh path 240a. The fourth connection part 245 may be disposed at a lower end of the fourth lower header 243 . One side of the second refrigerant connection pipe 262 may be connected to the fourth connection part 245 .

The first connecting portion 215 to the fourth connecting portion 245 are disposed at the lower end of one side of the lower header with reference to FIG. 10 , but the present invention is not limited thereto.

The 1a connection part 215a may be disposed on the left side of the 2a connection part 225a. The 1b connection part 215b may be disposed on the left side of the 2b connection part 225b. The third connection part 235 may be disposed on the left side of the fourth connection part 245 . Therefore, when each heat exchange part is loaded back and forth, each connection part can be arrange|positioned without collision.

The lower left end of the third heat exchange unit 230 and the lower left end of the fourth heat exchange unit 240 form connection holes 237 and 247, respectively, so that the refrigerant may circulate. However, unlike the first heat exchangers 210 and 220 of the first embodiment, a connection hole is not formed between the first heat exchanger 210 and the second heat exchanger 220 of the second embodiment. Accordingly, the refrigerant is not circulated between the second path 210b and the fourth path 220b.

According to the second embodiment, the flow order of the refrigerant may be changed according to which connection part of the first heat exchange unit 210 to the fourth heat exchange unit 240 the refrigerant pipe is arranged.

The refrigerant inlet pipe 250 may be connected to a heat exchange unit disposed below the downstream. During the cooling operation, the cold refrigerant flows into the first heat exchange unit 210 through the refrigerant inlet pipe 250 .

In the first embodiment, unlike the refrigerant discharged from the first heat exchange unit 210 flows into the second heat exchange unit 220, in the second embodiment, the refrigerant discharged from the first heat exchange unit 210 is a third heat exchange It flows into part 230 . However, since the refrigerant finally flows through the second heat exchange unit 220 , the refrigerant of the first heat exchange unit 210 has a relatively lower temperature than the second heat exchange unit 220 , and as a result, the first embodiment and Similarly, countercurrent is formed.

As in the first embodiment, the third heat exchange unit 230 and the fourth heat exchange unit 240 are formed in a counter flow, so that cooling performance is further improved.

The first refrigerant connection pipe 261 may be connected between the heat exchange unit disposed at the lower side of the downstream and the heat exchange unit disposed at the upper side of the downstream side. The first refrigerant connection pipe 261 may connect the second path 210b and the fifth path 230a. One side of the first refrigerant connection pipe 261 is connected to the 1a connection part 215a and the other side is connected to the third connection part 235 . The first refrigerant connection pipe 261 connects the heat exchange unit disposed below and the heat exchange unit disposed above in series so that all refrigerants circulate through all heat exchange units.

The first refrigerant connection pipe 261 may connect the lower end of one side of the heat exchange unit disposed downstream and the lower end of the other side of the heat exchange unit disposed above the downstream side. More specifically, the first refrigerant connection pipe 261 may connect the lower left side of the first heat exchange unit 210 and the lower right side of the third heat exchange unit 230 . Since the first refrigerant connection pipe 261 connects the other side of the first heat exchange part 210 and the third heat exchange part 230, the second heat exchangers 230 and 240 are also large like the first heat exchangers 210 and 220. It is formed in a counter-current flow, so there is an advantage in that the cooling performance is further improved.

Communication holes 237 and 247 are respectively formed on opposing surfaces of the third lower header 233 and the fourth lower header 243 . When the refrigerant flows from the sixth path 230b disposed in the third heat exchange unit 230 to the eighth path 240b disposed in the fourth heat exchange unit 240 , the fourth heat exchange is performed through the communication holes 237 and 247 . flow to section 240 .

The second refrigerant connection pipe 262 may be connected between the heat exchange unit disposed above the upstream and the heat exchange unit disposed below the upstream. The second refrigerant connection pipe 262 may connect the seventh path 240a and the fourth path 220b. The second refrigerant connection pipe 262 may have one side connected to the fourth connection part 245 and the other side connected to the 2b connection part 225b. The second refrigerant connection pipe 262 connects the heat exchange unit disposed below and the heat exchange unit disposed above in series so that all refrigerants circulate through all heat exchange units.

The second refrigerant connection pipe 262 may connect the lower end of one side of the heat exchange unit disposed above the upstream and the lower end of the other side of the heat exchange unit disposed below the upstream. More specifically, the second refrigerant connection pipe 262 may connect the lower right side of the fourth heat exchange unit 240 and the lower left side of the second heat exchange unit 220 .

The refrigerant discharge pipe 270 may be connected to a heat exchange unit disposed below the upstream. The refrigerant discharge pipe 270 may be disposed at the lower right side of the second heat exchange unit 220 .

Both the refrigerant inlet pipe 250 and the refrigerant outlet pipe 270 may be disposed in a heat exchange unit positioned below. Since the refrigerant inlet pipe 250 and the refrigerant outlet pipe 270 are disposed close together, there is an effect that the space in which the pipe is installed can be minimized, and the pipe structure can be simplified so that it can be easily designed.

In the heat exchange assembly 200 according to the second embodiment, the refrigerant is a refrigerant inlet pipe 250 - a first pass 210a - a second pass 210b - a first refrigerant connection pipe 261 - a fifth pass 230a - 6th pass (230b) - 8th pass (240b) - 7th pass (240a) - 2nd refrigerant connection pipe (262) - 4th path (220b) - 3rd pass (220a) - Refrigerant discharge pipe 270 ) are passed in order.

In the heat exchange assembly 200 according to the second embodiment, since both the first heat exchangers 210 and 220 and the second heat exchangers 230 and 240 are formed in counter flow, heat exchange performance is improved.

In addition, since the heat exchange assembly 200 according to the second embodiment passes through the heat exchange unit disposed above and the heat exchange unit disposed below in a balanced way, there is an effect that almost no temperature difference occurs between the upper and lower parts.

In addition, in the heat exchange assembly 200 according to the second embodiment, unlike the first embodiment, the refrigerant inlet pipe 250 and the refrigerant outlet pipe 270 are connected at a position adjacent to each other. It has the advantage of being easy to design.

The operation of the indoor unit of the air conditioner according to the first embodiment will be described as follows.

In the heat exchange assembly 100 according to the first embodiment, the refrigerant is, the refrigerant inlet pipe 150 - the first pass (110a) - the second pass (110b) - the fourth pass (120b) - the third pass (120a)- The refrigerant connection pipe 160 - the fifth pass (130a) - the sixth pass (130b) - the eighth pass (140b) - the seventh path (140a) - passes through the refrigerant discharge pipe 170 in order.

Therefore, even when only the remote blowing fan 71 is operated, all the refrigerants exchange heat with the intake air in the third heat exchange unit 130 and the fourth heat exchange unit 140 , so that cooling and heating efficiency can be maintained.

In the case of cooling operation, the refrigerant flows through the heat exchange unit and the temperature gradually rises. However, since it passes through the second heat exchange unit 120 disposed upstream after passing through the first heat exchange unit 110 disposed downstream, the intake air has a relatively high temperature of 1 in the second heat exchange unit 120 . After being cooled by the car, since the first heat exchanger 110 having a relatively low temperature is secondarily cooled, there is an effect of improving the cooling performance.

Similarly, since the intake air is first cooled in the fourth heat exchange unit 140 having a relatively high temperature and then is cooled secondarily in the third heat exchange unit 130 having a relatively low temperature, the effect of improving the cooling performance is obtained. there is.

In fact, according to an internal experiment, when the heating and cooling efficiency according to the prior art is set to 100%, the heating and cooling efficiency according to the first embodiment was found to be 105.6%.

The operation of the indoor unit of the air conditioner according to the second embodiment will be described as follows.

In the heat exchange assembly 200 according to the second embodiment, the refrigerant includes the refrigerant inlet pipe 250 - the first pass 210a - the second pass 210b - the first refrigerant connection pipe 261 - the fifth pass 230a. ) - 6th pass (230b) - 8th pass (240b) - 7th pass (240a) - 2nd refrigerant connection pipe (262) - 4th path (220b) - 3rd pass (220a) - Refrigerant discharge pipe ( 270) are passed in order.

Therefore, even if only the remote blowing fan 71 is operated, all refrigerants exchange heat with the intake air in the third heat exchange unit 230 and the fourth heat exchange unit 240 , so that cooling and heating efficiency can be maintained.

In the case of cooling operation, the refrigerant flows through the heat exchange unit and the temperature gradually rises. However, since the intake air is cooled primarily in the fourth heat exchanger 240 having a relatively high temperature and then is cooled secondarily in the third heat exchanger 230 having a relatively low temperature, the cooling performance is improved.

In addition, since it first passes through the first heat exchange unit 210 disposed downstream and then passes through the second heat exchange unit 220 disposed upstream last, the second heat exchange unit in which the intake air has a relatively high temperature. After being first cooled in 220 , it is secondarily cooled in the first heat exchange unit 210 , which has a relatively low temperature, so that the cooling performance is improved.

According to an internal experiment, when the heating and cooling efficiency according to the prior art was set to 100%, the heating and cooling efficiency according to the second embodiment was found to be 104.3%.

Meanwhile, in the above experiment, the deviation of the discharge temperature according to the prior art was about 5 degrees, but the deviation of the discharge temperature according to the first embodiment was about 9 degrees. However, the deviation of the discharge temperature according to the second embodiment is about 4.8 degrees, which has the advantage that the deviation of the discharge temperature is reduced compared to the prior art. 18 is a diagram showing the temperature of the air discharged from the blowing fan measured for each section according to the second embodiment, and it can be seen that the air discharge temperature according to the second embodiment has a small overall deviation.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

1: Indoor unit of air conditioner
10: cabinet 20: door
31,32: outlet 71,72: blower fan
100: heat exchange assembly according to the first embodiment
110: first heat exchange unit 120: second heat exchange unit
130: third heat exchange unit 140: fourth heat exchange unit
150: refrigerant inlet pipe 160: refrigerant connection pipe
170: refrigerant discharge pipe
200: heat exchange assembly according to the second embodiment
210: first heat exchange unit 220: second heat exchange unit
230: third heat exchange unit 240: fourth heat exchange unit
250: refrigerant inlet pipe 261: first refrigerant connection pipe
262: refrigerant connection pipe 270: refrigerant discharge pipe

Claims (13)

cabinet;
a plurality of outlets disposed in the cabinet and arranged vertically;
a heat exchange assembly disposed inside the cabinet and provided with a plurality of heat exchange units vertically disposed along the discharge port to exchange heat with indoor air and a refrigerant;
and a blower fan disposed at the front end or rear end of the heat exchange unit, a plurality of blowers disposed vertically along the discharge port, and at least one blower fan disposed at each heat exchange unit;
The heat exchange assembly,
a refrigerant inlet pipe connected to one heat exchange unit disposed below among the heat exchange units;
a refrigerant connection pipe connecting the plurality of heat exchange units;
a refrigerant discharge pipe connected to a heat exchange unit to which the refrigerant inlet pipe is not connected;
including,
An indoor unit of an air conditioner in which the heat exchange units are connected in series with each other. According to claim 1,
The heat exchange unit,
Manufactured in a microchannel type,
a plurality of flat tubes having flow paths formed therein;
a fin connecting between the flat tubes and conducting heat;
a lower header connected to the lower ends of the plurality of flat tubes;
an upper header connected to the upper ends of the plurality of flat tubes;
It is disposed on the lower header, the baffle for partitioning the inner space of the lower header; further comprising,
The refrigerant inlet pipe, the refrigerant connecting pipe, or the refrigerant outlet pipe is an indoor unit of the air conditioner connected to a lower header. According to claim 1,
The blower fan,
An indoor unit of an air conditioner for selectively discharging air to the plurality of outlets by individually turning on/off a plurality of blowing fans. According to claim 1,
The heat exchange unit,
At least two or more are stacked up and down,
An indoor unit of an air conditioner disposed to overlap at least two in front and rear. 5. The method of claim 4,
The heat exchange unit is based on the air flow direction,
A refrigerant inlet pipe is connected to the heat exchange unit disposed downstream,
An indoor unit of an air conditioner in which a refrigerant discharge pipe is connected to a heat exchange unit disposed upstream. 5. The method of claim 4,
The refrigerant circulates through all heat exchange units disposed below and then circulates through all heat exchange units disposed above. 7. The method of claim 6,
The refrigerant inlet pipe is connected to a heat exchange unit disposed below the downstream,
The refrigerant discharge pipe is an indoor unit of the air conditioner connected to a heat exchange unit disposed above the upstream. 7. The method of claim 6,
The refrigerant connection pipe is connected between the heat exchange unit disposed below the upstream and the heat exchange unit disposed above the downstream to flow the refrigerant. 9. The method of claim 8,
The refrigerant connection pipe is an indoor unit of the air conditioner connecting the lower end of one side of the heat exchange unit disposed below the upstream side and the lower end of the same side of the heat exchange unit disposed above the downstream side. 5. The method of claim 4,
The refrigerant is an indoor unit of an air conditioner that circulates through all heat exchangers disposed above and then circulates through heat exchangers disposed below. 11. The method of claim 10,
The refrigerant inlet pipe is connected to a heat exchange unit disposed below the downstream,
The refrigerant discharge pipe is an indoor unit of the air conditioner connected to a heat exchange unit disposed below the upstream. 11. The method of claim 10,
The refrigerant connection pipe,
A first refrigerant connection pipe connecting between the heat exchange unit disposed below the downstream and the heat exchange unit disposed above the downstream; and
The indoor unit of the air conditioner further comprising a second refrigerant connection pipe connecting between the heat exchange unit disposed above the upstream and the heat exchange unit disposed below the upstream. 13. The method of claim 12,
The first refrigerant connection pipe connects the lower end of one side of the heat exchange unit disposed downstream and the lower end of the other side of the heat exchange unit disposed above the downstream side,
The second refrigerant connection pipe is an indoor unit of the air conditioner connecting the other lower end of the heat exchange unit disposed above the upstream and the lower end of one side of the heat exchange unit disposed below the upstream.

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