KR101737365B1 - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
KR101737365B1
KR101737365B1 KR1020160010596A KR20160010596A KR101737365B1 KR 101737365 B1 KR101737365 B1 KR 101737365B1 KR 1020160010596 A KR1020160010596 A KR 1020160010596A KR 20160010596 A KR20160010596 A KR 20160010596A KR 101737365 B1 KR101737365 B1 KR 101737365B1
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KR
South Korea
Prior art keywords
refrigerant
heat
heat exchanger
pipe
header pipe
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Application number
KR1020160010596A
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Korean (ko)
Inventor
김각중
윤필현
송치우
정재화
Original Assignee
엘지전자 주식회사
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Priority to KR1020160010596A priority Critical patent/KR101737365B1/en
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Publication of KR101737365B1 publication Critical patent/KR101737365B1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • F25B47/022Defrosting cycles hot gas defrosting
    • F25B41/003
    • F25B41/04
    • F25B41/046
    • F25B41/062
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007Auxiliary supports for elements
    • F28F9/013Auxiliary supports for elements for tubes or tube-assemblies

Abstract

The present invention provides an air-conditioner capable of providing heating to an indoor space while performing defrosting operation. To this end, the air-conditioner comprises: a compressor to compress refrigerant; a hot gas pipeline in which a part of the refrigerant compressed in the compressor flows; an indoor heat exchanger to perform heat exchange with the interior air while the refrigerant passing a four-way valve flows therein; an outdoor expansion device in which the refrigerant heat-exchanged in the indoor heat exchanger is expanded; an outdoor heat exchanger including two or more heat exchanging units operated as a condenser during cooling operation, operated as an evaporator during heating operation, and performing heat exchange with the surrounding air while allowing the refrigerant to be passed; and the four-way valve in which the remaining refrigerant compressed in the compressor flows to guide the refrigerant discharged from the compressor to the outdoor heat exchanger during the cooling operation and to guide the remaining refrigerant to the indoor heat exchanger during the heating operation. The refrigerant passing the hot gas pipeline performs a partial defrosting operation while flowing in one of the two heat-exchanging units. The refrigerant performing the partial defrosting operation is expanded while passing the outdoor expansion device and is evaporated while flowing through the other one of the two heat-exchanging units, to perform the heating operation.

Description

Air conditioner
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner in which a plurality of outdoor heat exchangers perform defrost operation and others perform heating operation.
Background Art [0002] Generally, an air conditioner is a device for cooling or heating a room using a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger. A radiator for cooling the room, and a radiator for heating the room. And a cooling / heating air conditioner for cooling or heating the room.
And a four-way valve for changing the flow path of the refrigerant compressed by the compressor according to the cooling operation and the heating operation when the air conditioner is composed of the air conditioner and the air conditioner. That is, the refrigerant compressed in the compressor during the cooling operation flows through the four-way valve to the outdoor heat exchanger, and the outdoor heat exchanger serves as the condenser. The refrigerant condensed in the outdoor heat exchanger is expanded in the expansion mechanism, and then flows into the indoor heat exchanger. At this time, the indoor heat exchanger acts as an evaporator, and the refrigerant evaporated in the indoor heat exchanger passes through the four-way valve and flows into the compressor.
On the other hand, the refrigerant compressed in the compressor during the heating operation flows through the four-way valve to the indoor heat exchanger, and the indoor heat exchanger serves as the condenser. The refrigerant condensed in the indoor heat exchanger is expanded in the expansion mechanism, and then flows into the outdoor heat exchanger. At this time, the outdoor heat exchanger acts as an evaporator, and the refrigerant evaporated in the outdoor heat exchanger passes through the four-way valve and flows into the compressor.
In the above-described air conditioner, water is generated on the surface of the heat exchanger serving as an evaporator during operation, and in the case of cooling operation, water is generated on the surface of the outdoor heat exchanger in the case of heating operation on the surface of the indoor heat exchanger. In this case, when the condensed water generated on the surface of the outdoor heat exchanger is frozen at the time of the heating operation, smooth flow of the outdoor air and heat exchange are interrupted and the heating performance is lowered.
Therefore, when the heating operation is stopped during the heating operation and the refrigeration cycle is operated in the reverse cycle (i.e., cooling operation) in order to remove the congested condensed water, the refrigerant of high temperature and high pressure passes through the outdoor heat exchanger, Is melted by the heat of the refrigerant. However, when the defrosting operation is performed in the reverse cycle as described above, there has been a problem that the heating of the room must be stopped.
In order to solve this problem, in Korean Patent Laid-Open Publication No. 10-2009-0000925, a heat exchanger of an outdoor heat exchanger is divided into a plurality of heat exchangers, one of the heat exchangers is driven by an evaporator and the other heat exchanger is operated by a high- Defrosting operation is performed.
However, Korean Laid-Open Publication No. 10-2009-0000925 discloses that since the refrigerant defrosting one heat exchanging portion flows into the discharging end of the other heat exchanging portion, the temperature and pressure of the heat exchanging portion (evaporating) There is a problem that sufficient heat exchange does not occur and the efficiency of the air conditioner is lowered.
Korean Laid-Open Publication No. 10-2009-0000925 discloses that the refrigerant discharged from the heat exchanging part during the heating operation lowers the temperature of the heat exchanging part during the defrosting operation and thus the defrosting is difficult to divide and deflate, and the defrosting cycle becomes shorter and shorter, There is a problem that operation is difficult.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an air conditioner that can supply heating to a room while performing a defrosting operation.
Another object of the present invention is to provide an air conditioner that can efficiently perform defrosting operation and heating operation of an outdoor heat exchanger having a plurality of heat exchanging units.
The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.
According to an aspect of the present invention, there is provided an air conditioner including: a compressor for compressing a refrigerant; A hot gas pipe through which a part of the refrigerant compressed in the compressor flows; An indoor heat exchanger for exchanging heat with indoor air while the refrigerant passing through the four-way valve flows; An outdoor expansion mechanism in which the refrigerant heat-exchanged in the indoor heat exchanger is expanded; An outdoor heat exchanger including at least two heat exchangers acting as a condenser during cooling operation and serving as an evaporator during heating operation and exchanging heat with ambient air while passing the refrigerant; And a four-way valve for guiding the refrigerant discharged from the compressor to the outdoor heat exchanger during a cooling operation and guiding the refrigerant discharged to the indoor heat exchanger during a heating operation, wherein the refrigerant discharged from the compressor flows through the hot gas piping The refrigerant which has undergone the partial defrosting operation flows through the outdoor expansion device and is expanded and evaporated while flowing to the other of the two heat exchange portions, And the heating operation is performed.
The details of other embodiments are included in the detailed description and drawings.
The air conditioner of the present invention having the above-described configuration has the following effects.
First, it is possible to continuously supply heating operation to indoor while performing defrost operation of outdoor heat exchanger.
Second, since the heating operation is not stopped during the regular defrosting operation, the heating efficiency of the entire system is increased.
Third, after the defrosting operation is completed, the normal heating operation can be immediately provided without the need for the preheating time of the indoor heat exchanger for performing the heating operation.
Fourthly, there is an advantage that the efficiency of the heating operation and the defrost operation is not lowered when a part of the plurality of heat exchanging parts is defrosting operation and the other part is heating operation.
Fifth, there is an advantage that the flow path of the refrigerant during the cooling operation and the heating operation is variable.
Sixth, there is an advantage of reducing the heat exchange between the refrigerant and the air during the heating operation and maximizing the efficiency by extending the heat exchange between the refrigerant and the air during the cooling operation.
The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.
1 is a view showing a flow of a refrigerant in an outdoor unit when the air conditioner is heated according to the first embodiment of the present invention;
2 is a view showing the flow of refrigerant in the outdoor unit during the partial defrost operation of the first heat exchanger of the first embodiment;
3 is a view showing the flow of refrigerant in the outdoor unit during the partial defrosting operation of the second heat exchanger of the first embodiment;
4 is a view showing the flow of a refrigerant during a cooling operation of the air conditioner of the first embodiment;
5 is a control block diagram of the defrosting operation of the air conditioner of the first embodiment.
6 is a configuration diagram showing the flow of the refrigerant during the cooling operation of the air conditioner of the second embodiment.
Will be apparent from and will be elucidated with reference to the embodiments described hereinafter in detail. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
The terms spatially relative, "below", "beneath", "lower", "above", "upper" Can be used to easily describe the correlation of components with other components. Spatially relative terms should be understood as terms that include different orientations of components during use or operation in addition to those shown in the drawings. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.
The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises "and / or" comprising ", as used herein, unless the recited component, step, and / or step does not exclude the presence or addition of one or more other elements, steps and / I never do that.
Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.
In the drawings, the thickness and the size of each component are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size and area of each component do not entirely reflect actual size or area.
Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram illustrating a refrigerant flow in an outdoor unit when the air conditioner according to the first embodiment of the present invention is heated.
 The overall configuration of the air conditioner of this embodiment will be described with reference to Figs. 1 and 4. Fig.
Although not shown, the air conditioner of the present embodiment may include a plurality of indoor units and a plurality of outdoor units (OUs). A plurality of indoor units and a plurality of outdoor units are connected by a refrigerant pipe, and a plurality of indoor units are installed at a plurality of places where the user wants to cool and / or heat.
Referring to FIG. 1, the air conditioner of the present embodiment includes compressors 11 and 13, a hot gas piping, a four-way valve 30, an indoor heat exchanger, an outdoor expansion mechanism, and outdoor heat exchangers 70 and 80. The compressors 11 and 13 of the air conditioner, the hot gas piping, the four-way valve 30, the indoor heat exchanger, the outdoor expansion mechanism and the outdoor heat exchangers 70 and 80 are installed in the outdoor unit OU.
The compressors (11, 13) compress the refrigerant. One of the compressors 11 and 13 is composed of variable capacity compressors 11 and 13 such as inverter compressors 11 and 13 and the remaining compressors 11 and 13 are constant speed compressors. The gas-liquid separator 14 is connected to the suction side of the compressors 11 and 13, and the oil separator 16 and the check valve are provided at the discharge side.
The compressors (11, 13) compress the refrigerant introduced into the inflow side into a compression chamber and discharge it to the discharge side. The discharge piping 18 is connected to the discharge side of the compressors 11 and 13 and the inflow pipe 17 is connected to the inflow side of the compressors 11 and 13. The discharge pipe 18 is connected to the indoor heat exchanger or the outdoor heat exchanger (70, 80) by a four-way valve (30). The inflow pipe 17 is connected to the indoor heat exchanger or the outdoor heat exchanger (70, 80) by the four-way valve (30).
The refrigerant discharged from the discharge side flows to the four-way valve 30 connected to the discharge pipe 18. [
The four-way valve 30 changes the flow direction of the refrigerant in accordance with the cooling / heating operation of the air conditioner. In other words, the four-way valve 30 allows the refrigerant evaporated in the indoor heat exchanger (not shown) to flow to the compressors 11 and 13 during the cooling operation and compresses the refrigerant compressed in the compressors 11 and 13 through the outdoor heat exchangers 70, 80). During the heating operation, the refrigerant evaporated in the outdoor heat exchangers (70, 80) flows to the compressors (11, 13) and the refrigerant compressed in the compressors (11, 13) flows to the indoor heat exchanger (not shown). In the defrosting operation, the refrigerant evaporated in the outdoor heat exchangers (70, 80) flows to the compressors (11, 13) and the refrigerant, which has not flowed into the hot gas pipeline among the refrigerants compressed in the compressors (11, (Not shown).
The four-way valve 30 is connected to the discharge pipe 18 of the compressors 11 and 13, the inflow pipe 17 of the compressors 11 and 13, the indoor heat exchanger and the outdoor heat exchangers 70 and 80. The four-way valve 30 connects the discharge side of the compressors 11 and 13 with the outdoor heat exchangers 70 and 80 during the cooling operation and connects the indoor heat exchanger to the inflow side of the compressors 11 and 13. The four-way valve 30 connects the discharge side of the compressors 11 and 13 with the indoor heat exchanger and connects the outdoor heat exchangers 70 and 80 with the inflow side of the compressors 11 and 13 during the heating operation.
An indoor heat exchanger (not shown) cools or heats the room air by heat exchange between the refrigerant and the room air. Specifically, the refrigerant evaporates during the cooling operation and the room air is cooled, and the refrigerant compressed by the compressors (11, 13) is condensed during the heating operation to heat the room air. In the defrosting operation, the refrigerant passing through the four-way valve 30 flows and heats the indoor air. Although not shown in the drawings, a plurality of indoor heat exchangers may be provided for cooling and heating a plurality of indoor spaces. The indoor heat exchanger is connected to the four-way valve 30 and the indoor expansion valve (not shown).
The opening degree of the indoor expansion valve is controlled during the cooling operation to expand the refrigerant, and when the heating operation is performed, the indoor expansion valve is opened to allow the refrigerant to pass therethrough. The indoor expansion valve is provided between the indoor heat exchanger and the outdoor heat exchanger (70, 80).
The indoor expansion valve expands the refrigerant flowing into the indoor heat exchanger during the cooling operation. The indoor expansion valve passes the refrigerant flowing from the indoor heat exchanger during the heating operation and guides the refrigerant to the compressors (11, 13).
The outdoor heat exchangers (70, 80) are disposed in an outdoor unit arranged in an outdoor space, and exchange the refrigerant passing through the outdoor heat exchangers (70, 80) with outdoor air. The outdoor heat exchangers 70 and 80 function as a condenser for condensing the refrigerant during the cooling operation and serve as an evaporator for evaporating the refrigerant during the heating operation.
The outdoor heat exchangers (70, 80) are connected to the four-way valve (30) and the outdoor expansion mechanism. The refrigerant compressed by the compressors 11 and 13 and passed through the four-way valve 30 during the cooling operation flows into the outdoor heat exchangers 70 and 80, is condensed and flows to the outdoor expansion mechanism. The refrigerant expanded in the outdoor expansion mechanism during the heating operation flows to the outdoor heat exchangers (70, 80), then evaporates and flows to the four-way valve (30).
 The outdoor expansion mechanisms (40, 50) include expansion valves (41, 51) and check valves (43, 53). The refrigerant condensed in the indoor heat exchanger during the heating operation is expanded while passing through the expansion valves (41, 51). The refrigerant passing through the outdoor heat exchangers (70, 80) during the cooling operation passes through the check valves (43, 53) and is expanded in the indoor expansion mechanism (not shown). The refrigerant passing through the outdoor heat exchangers (70, 80) during the cooling operation can pass through the fully opened expansion valves (41, 51).
The gas-liquid separator 14 allows the refrigerant evaporated in the outdoor heat exchangers (70, 80) or the indoor heat exchanger to flow through the four-way valve (30). Therefore, the gas-liquid separator 14 maintains a temperature of about 0 to 5 degrees, and the cold heat can be radiated to the outside. The surface temperature of the gas-liquid separator 14 is lower than the temperature of the refrigerant condensed in the outdoor heat exchangers 70 and 80 during the cooling operation. The gas-liquid separator 14 may have a long cylindrical shape.
The air conditioner of the embodiment has a plurality of outdoor heat exchangers (70, 80) for reducing the heat exchange between the refrigerant and the air during the heating operation by extending the heat exchange between the refrigerant and the air during the heating operation, Heat exchange portions.
In the air conditioner of the embodiment, the partial defrosting operation is performed while the refrigerant that has passed through the hot gas piping flows to one of the two heat exchanging portions. The refrigerant that has undergone the partial defrosting operation is expanded through the outdoor expansion mechanism, So that the heating operation is performed.
Hereinafter, the structure of the piping and the outdoor heat exchanger (70, 80) in which the refrigerant path is varied in the heating operation and the cooling operation and in which the partial defrost operation can be performed will be described in detail.
The plurality of heat exchanging units include a first heat exchanging unit (70) and a second heat exchanging unit (80) in which a part or all of the refrigerant selectively flows. However, the number of the heat exchange units is not limited to this, and may have various numbers. Hereinafter, for convenience of explanation, the outdoor heat exchangers 70 and 80 will be described with reference to having two heat exchangers.
The heat exchanging units are devices for exchanging heat between the refrigerant flowing inside the heat exchanging units and the outside air. For example, the heat exchanging units include a plurality of refrigerant tubes through which the refrigerant flows and a plurality of heat transfer fins, so that the refrigerant and the air are heat-exchanged.
The heat exchange portions may be disposed along the air flow direction of the outdoor unit. That is, the heat exchange units may be arranged from the lower part to the upper part along the axial direction of the outdoor unit fan.
The refrigerant flowing into the plurality of heat exchanging units during the heating operation is distributed by the first distribution pipe (76) and the second distribution pipe (77).
The first distribution pipe 76 guides the refrigerant condensed in the indoor heat exchanger to the first heat exchanger 70 during the heating operation. The first distribution pipe (76) is connected to the indoor heat exchanger and the first heat exchange unit (70).
The second branch pipe 77 guides the refrigerant condensed in the indoor heat exchanger to the second heat exchanger 80 during the heating operation. The second distribution pipe 77 is connected to the first distribution pipe 76, the indoor heat exchanger, and the second heat exchange unit 80. That is, the first distribution pipe 76 and the second distribution pipe 77 distribute the refrigerant, which has flowed from the indoor heat exchanger, to the first heat exchange unit 70 and the second heat exchange unit 80 during the heating operation, The defrosted refrigerant passes through the first heat exchanging unit 70 to defrost the defrosted refrigerant to the second heat exchanging unit 80 or passes the defrosted refrigerant through the second heat exchanging unit 80 to the first heat exchanging unit 70 ).
The refrigerant passing through the first distribution pipe (76) and the second distribution pipe (77) is regulated in its path by the outdoor expansion mechanism. The outdoor expansion mechanism includes a first expansion valve 41 disposed in the first distribution pipe 76 to adjust the opening degree and a second expansion valve 51 disposed in the second distribution pipe 77 to adjust the opening degree do.
The first expansion valve 41 is connected to the first heat exchange unit 70 to expand the refrigerant flowing in the indoor heat exchanger and allow the refrigerant flowing in the first heat exchange unit 70 to pass therethrough. Of course, the refrigerant flowing from the first heat exchanger (70) to the indoor heat exchanger passes through the first distribution pipe (76), and the refrigerant flowing from the indoor heat exchanger to the first heat exchanger (70) A check valve 43 is disposed.
The second expansion valve (51) is connected to the second heat exchange unit (80) to expand the refrigerant flowing in the indoor heat exchanger and allow the refrigerant flowing in the second heat exchange unit (80) to pass through. Of course, the refrigerant flowing from the second heat exchanging part (80) to the indoor heat exchanger is passed through the second distribution pipe (77), and the refrigerant flowing from the indoor heat exchanger to the second heat exchanging part (80) A check valve 53 is disposed.
The first expansion valve (41) and the second expansion valve (51) are constituted by an electronic expansion valve.
During the heating operation, the refrigerant flowing out of the plurality of heat exchanging units is recovered to the compressors (11, 13) through the first header pipe (71) and the second header pipe (72). The refrigerant discharged from the compressors 11 and 13 flows into the first heat exchanging unit 70 and the second heat exchanging unit 80 through the first header pipe 71 and the second header pipe 72 .
The first header pipe 71 guides the refrigerant that has passed through the first heat exchanging unit 70 to the compressors 11 and 13 during the heating operation and supplies the refrigerant passed through the compressors 11 and 13 1 heat exchanger 70 as shown in Fig. The first header pipe 71 is connected to the first heat exchanger 70 and the compressors 11 and 13.
The first header pipe 71 is connected to the four-way valve 30 and the second header pipe 72. Therefore, the first header pipe 71 guides the refrigerant that has passed through the second heat exchanger 80 and the second header pipe 72 to the compressors 11 and 13 during the heating operation. The first header pipe 71 is connected to the inflow pipe 17 of the compressors 11 and 13 during the heating operation and is connected to the discharge pipe 18 of the compressors 11 and 13 during the cooling operation. One side of the first heat exchanging part (70) is connected to the first distribution pipe (76), and the other side is connected to the first header pipe (71).
The second header pipe 72 guides the refrigerant that has passed through the first heat exchanging portion 70 to the second heat exchanging portion 80 during the cooling operation and the refrigerant passing through the second heat exchanging portion 80 during the heating operation, To the compressors (11, 13). The second header pipe 72 is connected to the second heat exchanger 80 and the compressors 11 and 13. The second header pipe 72 is connected to the four-way valve 30 and the first header pipe 71. Therefore, during the heating operation, the refrigerant having passed through the second header pipe 72 flows into the first header pipe 71 and is recovered to the compressors 11 and 13. [
Further, in the embodiment, the refrigerant passes through the plurality of heat exchanging portions in series during the cooling operation and flows through the bypass piping 74, the first intermittent valve 75, And further includes a valve (73).
The bypass piping 74 is connected to the first distribution pipe 76 to guide the refrigerant to the second header pipe 72. The bypass piping 74 guides the refrigerant having passed through the first heat exchanging unit 70 to the second header pipe 72. The bypass piping 74 is branched between the first distribution pipe 76 and the first expansion valve 41 and is connected to the second header pipe 72.
The first bypass pipe (74) is provided with a first intermittent valve (75) which is opened and closed to regulate the flow of the refrigerant. The first intermittent valve 75 is opened to allow the refrigerant to flow from the first distribution pipe to the second header pipe 72 and the refrigerant flows from the second header pipe 72 to the first distribution pipe 76, . The first intermittent valve 75 is opened during the cooling operation and closed during the heating operation and the defrost operation.
The header check valve 73 prevents the refrigerant from flowing into the second header pipe 72 from the first header pipe 71 during the cooling operation and prevents the refrigerant from flowing from the second header pipe 72 to the first header pipe 71 to allow the refrigerant to flow.
The header check valve 73 is disposed in the second header pipe 72. Specifically, the header check valve 73 is located between the point where the bypass piping 74 is connected to the first header pipe 71 and the point where the first header pipe 71 is connected.
In the hot gas piping, a part of the refrigerant compressed in the compressors (11, 13) flows. Particularly, a part of the high-temperature and high-pressure refrigerant compressed by the compressors 11 and 13 during the defrosting operation flows into the heat exchanging units of the outdoor heat exchangers 70 and 80 through the hot gas piping to defrost the heat exchanging units.
The hot gas piping includes a first hot gas piping (61) and a second hot gas piping (62).
The first hot gas pipe (61) guides the high temperature and high pressure refrigerant discharged from the compressors (11, 13) to the first heat exchanger (70) during the defrosting operation. The first hot gas pipe (61) is connected to the first heat exchanger (70). Specifically, the first hot gas pipe (61) is connected to the first header pipe (71). The first hot gas piping 61 may be branched between the indoor heat exchanger and the four-way valve 30 and connected to the first header pipe 71. In an embodiment, the first hot gas piping 61 is connected to the compressors 11, 13, the discharge side and the four-way valve 30, and is connected to the first header pipe 71. That is, one side of the first hot gas piping 61 is connected to the first header pipe 71, and the other side is connected to the discharge piping 18 of the compressors 11, 13.
The second hot gas piping 62 guides the high temperature and high pressure refrigerant discharged from the compressors 11 and 13 to the second heat exchanging unit 80 during the defrosting operation. The second hot gas piping 62 is connected to the second heat exchanging part 80. Specifically, the second hot gas piping 62 is connected to the second header pipe 72. The second hot gas piping 62 may be branched between the indoor heat exchanger and the four-way valve 30 and connected to the second header pipe 72. In this embodiment, the second hot gas piping 62 is connected to the compressors 11, 13, the discharge side and the four-way valve 30, and is connected to the second header pipe 72. That is, one side of the second hot gas piping 62 is connected to the second header pipe 72, and the other side is connected to the discharge piping 18 of the compressors 11, 13. Of course, the second hot gas piping 62 may be branched in the first hot gas piping 61.
The pressure loss of the refrigerant can be reduced as compared with the case where the refrigerant compressed in the compressors 11 and 13 flows to the hot gas piping after passing through the four-way valve 30. [
The embodiment further includes a switching unit so as not to lower the efficiency of the defrosting operation and the heating operation when a part of the plurality of heat exchanging units is in the heating operation and the other part is in the defrosting operation.
The switching unit passes through the first heat exchanging unit (70) and the second heat exchanging unit (80) during the heating operation and guides the evaporated refrigerant to the inflow side of the compressors (11, 13) The refrigerant passed is guided to one of the two heat exchanging parts, and the refrigerant discharged from the other of the two heat exchanging parts is guided to the inflow side of the compressors (11, 13).
The switching unit includes a first switching unit (65) and a second switching unit (66).
The first switching unit 65 is disposed in the first header pipe 71 and connected to the first hot gas pipe 61. The first switching unit 65 may be constituted by various devices for switching the flow path. For example, the first switching unit 62 includes a three-way valve or a four-way valve. The first switching unit 65 may be connected to the first header pipe 71, the second header pipe 72, and the first heat exchange unit 70.
The second switching unit 66 is disposed in the second header pipe 72 and connected to the second hot gas pipe 62. The second switching unit 66 may be composed of various devices for switching the flow path. For example, the second cutaway unit includes a three-way valve or a four-way valve. The second switching unit 66 is connected to the second header pipe 72 and the second hot gas pipe 62.
It is preferable that the second header pipe 72 is connected to the first header pipe 71 by a first header pipe 71 between the first switching unit 65 and the four-way valve 30.
The operation of the first switching unit 65 and the second switching unit 66 will be described below in accordance with the respective operation states.
Operation of the switching unit during heating operation is as follows.
In the heating operation, the four-way valve 30 guides the refrigerant discharged from the compressors 11 and 13 to the indoor heat exchanger. The first switching unit 65 guides the refrigerant flowing from the first heat exchanging unit 70 to the first header pipe 71 to the compressors 11 and 13 and the refrigerant flowing from the first heat exchanging unit 70 The refrigerant flowing into the first header pipe 71 is restricted from flowing into the first hot gas pipe 61 and the refrigerant flowing into the first hot gas pipe 61 flows into the first header pipe 71 And the second switching unit 66 guides the refrigerant introduced into the second header pipe 72 from the second heat exchanging unit 80 to the first header pipe and the refrigerant flowing from the second heat exchanging unit 80 to the second header pipe 72, The refrigerant flowing into the header pipe 72 is prevented from flowing into the second hot gas pipe 62 and the refrigerant flowing into the second hot gas pipe 62 is restricted from flowing into the second header pipe 72 do.
The operation of the switching unit during the partial defrosting operation is as follows. Here, the partial defrosting operation means a state in which one of the plurality of heat exchanging units performs the heating operation and the other operates the defrosting operation.
The first switching unit 65 guides the refrigerant that has passed through the first hot gas piping 61 to the first heat exchanging unit 70 and the second header pipe 72 to restrict the refrigerant flowing into the first header pipe 71 from flowing into the first heat exchanging part 70.
The first expansion valve 41 is completely opened and the second expansion valve 51 is connected to the refrigerant passing through the first expansion valve 41 and the refrigerant passing through the indoor heat exchanger in the partial heat- Thereby expanding the refrigerant. Of course, in the partial defrosting operation of the first heat exchanging portion 70, the first expansion valve 41 can be fully opened or closed. When the first expansion valve (41) is closed during the partial defrosting operation of the first heat exchanging part (70), the refrigerant is bypassed to the first check valve (43).
The second switching unit 66 guides the refrigerant vaporized in the second heat exchanging unit 80 to the first header pipe 71 and the second hot gas pipe 62 ) To the second header pipe (72).
The first switching unit 65 guides the refrigerant vaporized in the first heat exchanging unit 70 to the compressors 11 and 13 and the second hot gas piping 61 The second switching unit 66 restricts the flow of the refrigerant from the first header pipe 71 to the second header pipe 71 during the partial defrosting operation of the second heat exchanging unit 80, The refrigerant passing through the second hot gas piping 62 is guided to the second heat exchanging unit 80 and the refrigerant passing through the second hot gas piping 62 is restricted from flowing into the first header pipe 71.
During the partial defrosting operation of the second heat exchanging part 80, the second expansion valve 51 is completely opened, and the first expansion valve 41 is closed by the refrigerant passing through the second expansion valve 51, Thereby expanding the refrigerant. Of course, in the partial defrosting operation of the second heat exchanging section 80, the second expansion valve 51 can be completely opened or closed. When the second expansion valve (51) is closed during the partial defrosting operation of the second heat exchange unit (80), the refrigerant is bypassed to the second check valve (53).
Accordingly, in the present invention, a part of the plurality of heat exchanging units performs the defrosting operation, and the remainder performs the heating operation. It is possible to continuously supply heated air to the room while performing the defrosting operation.
Temperature sensors 70a and 80a are installed in the first heat exchanging unit 70 and the second heat exchanging unit 80 to measure the temperature of the refrigerant flowing out from each heat exchanging unit. The outdoor heat exchangers 70 and 80 are provided with additional temperature sensors 100 to measure the temperature of the refrigerant flowing into the outdoor heat exchangers 70 and 80 and the temperature of the outdoor air. In order to determine whether defrosting has occurred, the temperature of outdoor air passing through the outdoor heat exchangers 70, 80 can be measured.
Although not shown, the outdoor heat exchangers 70 and 80 may include a plurality of blowers for blowing outdoor air to the outdoor heat exchangers 70 and 80.
In this embodiment, it is determined whether the defrosting operation should be performed by measuring the pressure of the refrigerant on the refrigerant inflow side of the compressors (11, 13). Therefore, the gas-liquid separator 14 of this embodiment is provided with the pressure sensor 15 for measuring the pressure of the refrigerant on the suction side of the compressors 11 and 13. On the other hand, the pressure sensor 15 may be installed between the gas-liquid separator 14 and the compressors 11, 13 (13, 15).
5 is a control block diagram of the defrosting operation of the air conditioner of the first embodiment.
Referring to FIGS. 1 and 5, the air conditioner of the present embodiment further includes a control unit 200. The controller 200 may be implemented as a microprocessor capable of logic determination.
The control unit 200 includes a temperature sensor 100 for measuring the temperature of the outdoor air or the refrigerant flowing into the outdoor heat exchangers 70 and 80 according to the defrosting method of the air conditioner of the present embodiment, The temperature sensor 70a for measuring the temperature of the refrigerant flowing into the first heat exchanging unit 70 and the temperature sensor 70a for measuring the pressure of the refrigerant flowing into the eighth heat exchanging unit 80 The sensed value at the temperature sensor 80a for measuring the temperature of the refrigerant is compared with the value of the normal operation of the air conditioner.
When it is determined that the outdoor heat exchangers 70 and 80 have been conceived, the control unit 200 compares the values of the outdoor heat exchangers 70 and 80 with the values of the first switching unit 65, The unit 65, the first expansion valve 41, the second expansion valve 51, and the four-way valve 30 are controlled to be opened or closed.
As a result, in this embodiment, one of the first heat exchanging unit 70 and the second heat exchanging unit 80 performs the defrosting operation and the other performs the heating operation.
Hereinafter, the flow of the refrigerant will be described for each operating state of the air conditioner of the present invention configured as described above.
The flow of the refrigerant in the heating operation of the air conditioner of the present embodiment will be described with reference to FIG.
During the heating operation, the refrigerant is compressed by the compressors (11, 13) and flows to the four-way valve (30). The first switching unit 65 guides the refrigerant flowing into the first header pipe 71 from the first heat exchanging unit 70 to the compressors 11 and 13 and discharges the refrigerant from the first heat exchanging unit 70 to the first heat exchanging unit 70, The second switching unit 66 restricts the inflow of the refrigerant introduced into the header pipe 71 into the first hot gas pipe 61 and the second switching unit 66 restricts the inflow of the refrigerant from the second heat exchanging unit 80 into the second header pipe 72 And the refrigerant introduced into the second header pipe 72 from the second heat exchange unit 80 is prevented from flowing into the second hot gas pipe 62. [ The first switching unit 65 and the first switching unit 65 are switched so that all of the refrigerant compressed by the compressors 11 and 13 passes through the four-way valve 30 and flows into the indoor heat exchanger (not shown).
The refrigerant that has passed through the indoor heat exchanger (not shown) passes through an indoor expansion mechanism (not shown) and expands while passing through the first expansion valve 41 and the second expansion valve 51. The refrigerant having passed through the first expansion valve (41) flows into the first heat exchanging part (70) and is evaporated while exchanging heat with the outdoor air blown by the blower. The refrigerant having passed through the second expansion valve (51) flows into the second heat exchange unit (80) and evaporates while exchanging heat with the outdoor air blown by the blower.
The refrigerant having passed through the first heat exchanging part 70 flows into the first header pipe 71 and the refrigerant having passed through the second heat exchanging part 80 flows into the second header pipe 72. The refrigerant having passed through the first heat exchanging portion 70 and the second heat exchanging portion 80 flows into the compressors 11 and 13 again by the first switching unit 65 and the second switching unit 66.
2 is a configuration diagram showing the flow of refrigerant in the outdoor unit during the partial defrosting operation of the first heat exchanger 70 in the first embodiment.
Referring to Fig. 2, the flow of the refrigerant in the partial defrosting operation of the first heat exchanger 70 of the air conditioner of the present embodiment will be described.
In the air conditioner in this embodiment, when the first heat exchanging unit 70 performs the defrosting operation, the second heat exchanging unit 80 performs the heating operation. Accordingly, the refrigerant compressed by the compressors 11 and 13 flows to the four-way valve 30 and the first hot gas pipe 61. The first switching unit 65 guides the refrigerant having passed through the first hot gas piping 61 to the first heat exchanging unit 70 and passes through the second header pipe 72 to the first header pipe 71 And restricts the flow of the refrigerant into the first heat exchanging part (70). The first expansion valve 41 is fully opened and the second expansion valve 51 expands the refrigerant passing through the first expansion valve 41 and the refrigerant condensed in the indoor heat exchanger. Of course, in the partial defrosting operation of the first heat exchanging portion 70, the first expansion valve 41 can be fully opened or closed. When the first expansion valve (41) is closed during the partial defrosting operation of the first heat exchanging part (70), the refrigerant is bypassed to the first check valve (43).
The second switching unit 66 guides the refrigerant vaporized in the second heat exchanging unit 80 to the first header pipe 71 and the refrigerant passing through the second hot gas pipe 62 flows into the second header pipe 71. [ (72).
The flow of the refrigerant during the defrosting operation of the first heat exchanging part (70) is as follows.
Specifically, a part of the refrigerant compressed in the compressors 11 and 13 flows into the first hot gas piping 61, and the rest of the refrigerant compressed in the compressors 11 and 13 flows into the indoor heat exchanger Flow.
The refrigerant flowing into the first hot gas pipe (61) passes through the first switching unit (65) and the first header pipe (71), and flows into the first heat exchanging unit (70). The high-temperature and high-pressure refrigerant introduced into the first heat exchanging part (70) removes the frost which is conceived by the first heat exchanging part (70). The refrigerant discharged from the first heat exchanging part (70) is removed from the second distribution pipe (77) through the first distribution pipe (76) and the first expansion valve (41). At this time, the first intermittent valve 75 of the bypass pipe 74 is closed.
The frost that has been frozen in the first heat exchanging part (70) is removed and the discharged refrigerant is mixed with the refrigerant condensed in the indoor heat exchanger in the second distribution pipe (77). The mixed refrigerant is expanded in the second expansion valve (51), flows into the second heat exchange section (80), and evaporated in the second heat exchange section (80).
The refrigerant evaporated in the second heat exchanging unit 80 passes through the second header pipe 72, the second switching unit 66 and the first header pipe 71 and flows into the compressors 11 and 13, .
3 is a configuration diagram showing the flow of refrigerant in the outdoor unit during the partial defrosting operation of the second heat exchanging unit 80 of the first embodiment.
Referring to Fig. 3, the flow of the refrigerant in the partial defrost operation of the second heat exchanger 80 of the air conditioner of the present embodiment will be described.
In the air conditioner in this embodiment, when the second heat exchanging unit 80 performs the defrosting operation, the first heat exchanging unit 70 performs the heating operation. Therefore, the refrigerant compressed in the compressors 11 and 13 flows into the four-way valve 30 and the second hot gas pipe 62.
The first switching unit 65 guides the refrigerant vaporized in the first heat exchanging unit 70 to the compressors 11 and 13 and the refrigerant passing through the first hot gas piping 61 flows into the first header pipe 71, The second switching unit 66 guides the refrigerant having passed through the second hot gas pipe 62 to the second heat exchanging unit 80 and the refrigerant passing through the second hot gas pipe 62 Thereby limiting the refrigerant from entering the first header pipe 71.
At this time, the second expansion valve (51) is completely opened, and the first expansion valve (41) expands the refrigerant passing through the second expansion valve (51) and the refrigerant condensed in the indoor heat exchanger. Of course, in the partial defrosting operation of the second heat exchanging section 80, the second expansion valve 51 can be completely opened or closed. When the second expansion valve (51) is closed during the partial defrosting operation of the second heat exchange unit (80), the refrigerant is bypassed to the second check valve (53). At this time, the first intermittent valve 75 of the bypass pipe 74 is closed.
The flow of the refrigerant during the defrosting operation of the second heat exchanging unit (80) is as follows.
Part of the refrigerant compressed in the compressors 11 and 13 flows into the second hot gas piping 62 and the rest of the refrigerant compressed in the compressors 11 and 13 flows through the four- .
The refrigerant flowing into the second hot gas piping 62 passes through the second switching unit 66 and the second header pipe 72 and flows into the second heat exchanging unit 80. The high-temperature and high-pressure refrigerant introduced into the second heat exchanging part (80) removes the frost which is conceived by the second heat exchanging part (80). The refrigerant discharged from the second heat exchanger 80 is discharged to the first distributor pipe 76 through the second distributor pipe 77 and the second expansion valve 51.
The frost which is frozen in the second heat exchanging part (80) is removed and the discharged refrigerant is mixed with the refrigerant condensed in the indoor heat exchanger in the first distribution pipe (76). The mixed refrigerant is expanded in the first expansion valve (41), flows into the first heat exchange section (70), and evaporated in the first heat exchange section (70).
The refrigerant evaporated in the first heat exchanging unit 70 passes through the first header pipe 71 and the first switching unit 65 and flows into the compressors 11 and 13 to maintain the heating cycle.
FIG. 4 is a view showing the flow of a refrigerant during a cooling operation of the air conditioner according to the present invention. Hereinafter, the flow of the refrigerant during the cooling operation of the air conditioner of the present embodiment will be described with reference to FIG.
During the cooling operation, the refrigerant is compressed by the compressors (11, 13) and flows to the four-way valve (30). At this time, the first switching unit 65 restricts the refrigerant compressed by the compressors 11 and 13 from flowing into the first heat exchanging unit 70, and the second switching unit 66 restricts the flow of refrigerant from the compressors 11 and 13 So that the compressed refrigerant is prevented from flowing into the second heat exchanging part (80).
 All of the refrigerant compressed in the compressors (11, 13) flows to the four-way valve (30). The refrigerant that has passed through the four-way valve 30 flows into the first heat exchanging unit 70 and the second heat exchanging unit 80 and is condensed while performing heat exchange with outdoor air blown from the blower.
The refrigerant having passed through the first heat exchanging part (70) and the second heat exchanging part (80) is expanded in an indoor expansion mechanism (not shown). And evaporated while passing through an indoor heat exchanger (not shown). At this time, the indoor air having the temperature raised by the heat exchange with the refrigerant while passing through the indoor heat exchanger, heats the room. The refrigerant having passed through the indoor heat exchanger passes through the four-way valve 30 and the gas-liquid separator 14 and flows into the compressors 11 and 13 again.
6 is a configuration diagram showing the flow of the refrigerant during the cooling operation of the air conditioner of the second embodiment.
The air conditioner of the second embodiment is different from the first embodiment of Fig. 4 in that the first check valve 43 is omitted, and there is a difference in the refrigerant path during the cooling operation. The parts without special description are the same as those in Fig.
The flow of the refrigerant in the cooling operation of the air conditioner of the second embodiment will be described with reference to Fig.
The refrigerant having passed through the first heat exchanging part 70 is bypassed by the bypass piping 74 and flows to the second heat exchanging part 80 through the second header pipe 72 and flows into the second heat exchanging part 80 And condensed again.
At this time, the first intermittent valve 75 is opened.
The refrigerant condensed in the second heat exchanging part (80) can be guided to the indoor heat exchanger through the second distribution pipe (77) and the second expansion valve (51). At this time, the first expansion valve 41 is closed.
This flow of refrigerant has the advantage of increasing the heat exchange between the refrigerant and the air during the cooling operation.
It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.
11, 13: Compressor 14: Gas-liquid separator
15: pressure sensor 16: oil separator
30: Four-way valve 40: First outdoor expansion mechanism
41: first expansion valve 43: first check valve
50: second outdoor expansion mechanism 51: second expansion valve
53: second check valve 70: first heat exchanger
70a: first heat exchanger portion temperature sensor 80: second heat exchanger portion
80a: first heat exchanger temperature sensor 100: outdoor heat exchanger temperature sensor

Claims (15)

  1. A compressor for compressing the refrigerant;
    A hot gas pipe through which a part of the refrigerant compressed in the compressor flows;
    An indoor heat exchanger for exchanging heat with indoor air while refrigerant compressed in the compressor flows;
    An outdoor expansion mechanism in which the refrigerant heat-exchanged in the indoor heat exchanger is expanded;
    An outdoor heat exchanger including at least two heat exchangers acting as a condenser during cooling operation and serving as an evaporator during heating operation and exchanging heat with ambient air while passing the refrigerant; And
    And a four-way valve for guiding the refrigerant discharged from the compressor to the outdoor heat exchanger during a cooling operation and guiding the refrigerant discharged to the indoor heat exchanger during a heating operation,
    The refrigerant having passed through the hot gas piping flows into one of the two heat exchanging units and is subjected to the partial defrosting operation,
    Wherein the two heat exchanging units include a first heat exchanging unit and a second heat exchanging unit in which a part or all of the refrigerant selectively flows,
    The refrigerant that has undergone the partial defrosting operation is expanded while passing through the outdoor expansion mechanism and is evaporated while flowing to the other of the two heat exchange units to perform the heating operation,
    The refrigerant compressed in the compressor is condensed in the first heat exchange unit and the refrigerant passing through the first heat exchange unit flows into the second heat exchange unit and is condensed again in the second heat exchange unit,
    Wherein the refrigerant condensed in the indoor heat exchanger is branched and guided to the first heat exchanger and the second heat exchanger during the heating operation.
  2. The method according to claim 1,
    In the hot gas piping,
    A first hot gas piping connected to the first heat exchanging unit,
    And a second hot gas piping connected to the second heat exchanging unit.
  3. The method of claim 2,
    The refrigerant passing through the first heat exchanging unit and the second heat exchanging unit during the heating operation leads the evaporated refrigerant to the inflow side of the compressor, and in the partial defrosting operation, the refrigerant passing through the hot gas piping passes through either of the two heat exchanging units And the refrigerant discharged from the other of the two heat exchange units is guided to the inflow side of the compressor.
  4. The method of claim 2,
    Wherein the first hot gas piping and the second hot gas piping are branched between the four-way valve and the compressor.
  5. The method of claim 3,
    A first distribution pipe for guiding the refrigerant condensed in the indoor heat exchanger to the first heat exchange unit during a heating operation,
    Further comprising a second distribution pipe connected to the first distribution pipe to guide the refrigerant condensed in the indoor heat exchanger to the second heat exchange unit during a heating operation,
    The outdoor expansion mechanism includes:
    A first expansion valve disposed in the first distribution pipe for regulating opening;
    And a second expansion valve disposed in the second distribution pipe to adjust the opening degree thereof.
  6. The method of claim 5,
    A first header pipe connected to the first hot gas pipe for guiding the refrigerant passed through the first heat exchanging unit to the compressor during a heating operation,
    Further comprising a second header pipe for guiding the refrigerant passing through the second heat exchanging unit to the compressor at the time of heating operation and connected to the second hot gas pipe,
    Wherein the first header pipe is connected to the second header pipe.
  7. The method of claim 6,
    A first bypass pipe connected to the first distribution pipe to guide the refrigerant to the second header pipe,
    Further comprising a first intermittent valve disposed in the first bypass pipe and opened and closed to regulate the flow of the refrigerant.
  8. The method of claim 6,
    The refrigerant is prevented from flowing from the first header pipe to the second header pipe during cooling operation,
    Further comprising a first check valve for allowing refrigerant to flow from the second header pipe to the first header pipe during a heating operation.
  9. The method of claim 7,
    The switching unit includes:
    A first switching unit disposed in the first header pipe and connected to the first hot gas pipe,
    And a second switching unit disposed in the second header pipe and connected to the second hot gas pipe.
  10. The method of claim 9,
    Wherein the first switching unit comprises:
    The refrigerant flowing into the first header pipe from the first heat exchanging unit is introduced into the first header gas pipe from the first heat exchanging unit, However,
    Wherein the second switching unit comprises:
    The refrigerant flowing into the second header pipe from the second heat exchanger is guided to the second header pipe through the second header pipe, An air conditioner that restricts the entry into the piping.
  11. The method of claim 10,
    Wherein the first switching unit comprises:
    Wherein the refrigerant flowed through the first header pipe and the refrigerant flowing through the first header pipe are guided to the first heat exchanging unit when the first heat exchanging unit is partially defrosted, Restricts the introduction into the heat exchange section,
    Wherein the second switching unit comprises:
    The refrigerant evaporated in the second heat exchanger is guided to the first header pipe during the partial defrost operation of the first heat exchanger and the refrigerant passing through the second hot gas pipe is restricted from flowing into the second header pipe Air conditioner.
  12. The method of claim 11,
    Wherein the first expansion valve is completely opened when the first expansion valve is partially defrosted, the second expansion valve is connected to the first expansion valve, and the air conditioner .
  13. The method of claim 12,
    Wherein the first switching unit comprises:
    The first header pipe and the second header pipe are connected to each other through the first header pipe and the second header pipe, respectively,
    Wherein the second switching unit comprises:
    The refrigerant that has passed through the second hot gas piping is guided to the second heat exchanging portion during the partial defrosting operation of the second heat exchanging portion and the refrigerant passing through the second hot gas piping is restricted from flowing into the first header pipe Air conditioner.
  14. 14. The method of claim 13,
    Wherein the second expansion valve is completely opened during the partial defrosting operation of the second heat exchanger, and the first expansion valve is connected to the refrigerant passing through the second expansion valve and an air conditioner for expanding the refrigerant condensed in the indoor heat exchanger .
  15. The method of claim 12,
    Wherein the first intermittent valve is opened during cooling operation and closed during heating operation and defrost operation.


KR1020160010596A 2016-01-28 2016-01-28 Air conditioner KR101737365B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020186906A1 (en) * 2019-03-15 2020-09-24 宁波奥克斯电气股份有限公司 Defrosting control method for air conditioner and air conditioner
KR102256588B1 (en) * 2020-01-31 2021-05-26 주식회사 삼화에이스 Air conditioning system using heat pump
WO2021112470A1 (en) * 2019-12-03 2021-06-10 Samsung Electronics Co., Ltd. Air conditioner

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101288745B1 (en) 2011-10-27 2013-07-23 엘지전자 주식회사 Air conditioner
KR101319778B1 (en) 2011-10-27 2013-10-17 엘지전자 주식회사 Air conditioner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101288745B1 (en) 2011-10-27 2013-07-23 엘지전자 주식회사 Air conditioner
KR101319778B1 (en) 2011-10-27 2013-10-17 엘지전자 주식회사 Air conditioner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020186906A1 (en) * 2019-03-15 2020-09-24 宁波奥克斯电气股份有限公司 Defrosting control method for air conditioner and air conditioner
WO2021112470A1 (en) * 2019-12-03 2021-06-10 Samsung Electronics Co., Ltd. Air conditioner
KR102256588B1 (en) * 2020-01-31 2021-05-26 주식회사 삼화에이스 Air conditioning system using heat pump

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