KR20160073897A - An air conditioner - Google Patents

An air conditioner Download PDF

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Publication number
KR20160073897A
KR20160073897A KR1020150063718A KR20150063718A KR20160073897A KR 20160073897 A KR20160073897 A KR 20160073897A KR 1020150063718 A KR1020150063718 A KR 1020150063718A KR 20150063718 A KR20150063718 A KR 20150063718A KR 20160073897 A KR20160073897 A KR 20160073897A
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KR
South Korea
Prior art keywords
refrigerant
pipe
storage unit
receiver
storage
Prior art date
Application number
KR1020150063718A
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Korean (ko)
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KR101695543B1 (en
Inventor
정종환
이호기
권상영
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to CN201510514654.0A priority Critical patent/CN105716307B/en
Priority to US14/935,089 priority patent/US10041705B2/en
Priority to EP15195631.5A priority patent/EP3034962B1/en
Publication of KR20160073897A publication Critical patent/KR20160073897A/en
Application granted granted Critical
Publication of KR101695543B1 publication Critical patent/KR101695543B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/40—Vibration or noise prevention at outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Abstract

The present embodiment relates to an air conditioning device. The air conditioning device according to the embodiment of the present invention includes: a compressor compressing a coolant; a condenser condensing the coolant compressed by the compressor; an expansion device decreasing a pressure of the coolant condensed by the condenser; an evaporator evaporating the coolant of which the pressure is decreased by the expansion device; and a coolant storing device bypassing and storing at least some of the coolant condensed by the condenser. The coolant storing device includes: a first storing unit storing the bypassed coolant; and a second storing unit allowing the coolant which has passed through the evaporator to flow thereinto and discharging the gaseous coolant of the received coolant to the compressor. The first storing unit is arranged in the upper side of the second storing unit, thus the coolant of the first storing unit can be supplied to the second storing unit. The present invention is to provide an air conditioning device facilitating a coolant supply to a liquid separator from a receiver and reducing noise.

Description

An air conditioner

The present invention relates to an air conditioner.

The air conditioner is a device for keeping the air in a predetermined space in a most suitable condition according to the purpose of use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigerant cycle for compressing, condensing, expanding, and evaporating the refrigerant is driven to cool or heat the predetermined space .

The predetermined space may be variously proposed depending on the place where the air conditioner is used. For example, when the air conditioner is installed in a home or an office, the predetermined space may be an indoor space of a house or a building. On the other hand, when the air conditioner is disposed in a car, the predetermined space may be a boarding space on which a person boarded.

On the other hand, the air conditioner can be operated so as to be switchable to the cooling mode or the heating mode. When the air conditioner is operated in the cooling mode, the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. On the other hand, when the air conditioner operates in the heating mode, the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser. The air conditioner may be provided with a flow control valve for controlling the flow direction of the refrigerant so that the cooling operation or the heating operation can be switched.

The air conditioner includes a gas-liquid separator disposed at an inlet side of the compressor for separating the gaseous refrigerant from the refrigerant passing through the evaporator and allowing the gaseous refrigerant to flow into the compressor. The air conditioner further includes a receiver for storing at least a part of the refrigerant in the condensed refrigerant.

The gas-liquid separator and the receiver may be integrally provided. The present applicant has filed the following application on the integral structure of such a gas-liquid separator and a receiver.

[Prior Application]

1. Application number (filing date): 10-2012-0077520 (July 17, 2012)

2. Name of invention: air conditioner

According to the conventional application, there is a problem that the receiver is positioned below the gas-liquid separator and the supply of the refrigerant from the receiver to the gas-liquid separator is not smooth.

Also, since the refrigerant passing through the supercooling heat exchanger is supplied to the gas-liquid separation inlet pipe having a relatively small volume, there is a problem that noise due to the flow of the refrigerant may be generated.

It is an object of the present invention to provide an air conditioner capable of smoothly supplying refrigerant from a receiver to a gas-liquid separator and reducing noise generation.

An air conditioner according to an embodiment of the present invention includes: a compressor for compressing a refrigerant; A condenser for condensing the refrigerant compressed in the compressor; An expansion device for reducing the pressure of the refrigerant condensed in the condenser; An evaporator for evaporating the refrigerant decompressed in the expansion device; And a refrigerant storage device for bypassing and storing at least a part of the refrigerant condensed in the condenser, wherein the refrigerant storage device includes: a first storage part for storing the bypassed refrigerant; And a second storage section for introducing the refrigerant having passed through the evaporator and discharging the gaseous refrigerant out of the introduced refrigerant to the compressor, wherein the first storage section is disposed on the upper side of the second storage section, And a refrigerant can be supplied to the second storage unit.

The apparatus further includes a receiver outlet pipe extending from the first reservoir to the second reservoir and guiding the refrigerant in the first reservoir to flow to the second reservoir by a natural gradient.

A liquid discharge port provided in the first reservoir and connected to one side of the receiver outlet pipe; And a liquid inlet port provided in the second reservoir and coupled to the other side of the receiver outlet pipe.

The liquid discharge port may be disposed at a lower portion of the first storage portion, and the liquid inlet port may be disposed at an upper portion of the second storage portion.

Further, a receiver outlet valve installed in the receiver outlet pipe and capable of adjusting the amount of refrigerant discharged from the first reservoir may be further included.

A case forming the first storage unit and the second storage unit; And a partition plate that is disposed inside the case and that divides the first storage unit and the second storage unit.

In addition, the case may include a first case defining the first storage unit and a second case defining the second storage unit, and the first and second cases may be integrally formed.

A suction pipe installed inside the second case and guiding the refrigerant in the second storage part to the compressor; And a lower cover provided at a lower portion of the case and having an outlet port to which the suction pipe is connected.

The suction pipe may include a first pipe portion located inside the second case and extending upward toward the partition plate; And a second pipe portion located outside the second case and extending upwardly from the lower cover.

The first pipe portion is formed with an inflow end portion located above the second storage portion and through which the refrigerant existing in the second storage portion flows.

Further, the inflow end portion may be inclined at a predetermined angle &thetas; with respect to the lower cover.

The receiver outlet pipe may include an outer pipe portion disposed outside the second storage portion and an inner pipe portion extending from the outer pipe portion and disposed inside the second storage portion, As shown in Fig.

A first subcooler for supercooling the refrigerant condensed in the condenser; A receiver inlet pipe for guiding the refrigerant passed through the first subcooler to the first storage unit; And a receiver inlet valve installed in the receiver inlet pipe.

An oil discharge port formed in the lower cover for discharging the refrigerant stored in the second storage part; An oil return pipe extending from the oil discharge port to the suction pipe; And an oil valve installed in the oil return pipe for regulating an oil flow rate.

An air conditioner according to another aspect includes: a compressor for compressing refrigerant; A condenser for condensing the refrigerant compressed in the compressor; A first subcooler for supercooling the refrigerant condensed in the condenser; A second subcooler disposed at an outlet side of the first subcooler; A receiver having a connection port through which at least a part of the refrigerant passing through the first subcooler is introduced; A gas-liquid separator into which at least a part of the refrigerant passing through the second subcooler is introduced; And a receiver outlet pipe extending downward from the receiver toward the gas-liquid separator and guiding the liquid refrigerant in the receiver to be introduced into the gas-liquid separator.

In addition, a receiver outlet valve installed in the receiver outlet pipe is further included.

The receiver and the gas-liquid separator are integrally formed, and are separated upward and downward by a partition plate.

According to the present invention, the first storage unit for storing the refrigerant passed through the condenser and the second storage unit for storing the refrigerant to be introduced into the compressor are integrally formed in one case, so that the structure of the air conditioner can be simplified .

Since the first storing part is located above the second storing part, the liquid refrigerant stored in the first storing part can be introduced into the second storing part by gravity, so that the refrigerant supply to the second storing part smoothly .

Further, since the refrigerant having passed through the supercooling device can be directly supplied to the refrigerant storage device via the bypass pipe, the generation of noise due to the refrigerant flow can be reduced. For example, the generation of refrigerant noise can be reduced as compared with a case where refrigerant having passed through the supercooling device is supplied to the low-pressure pipe.

In addition, since the heat transfer can be performed through the partition plate partitioning the first storage unit and the second storage unit, the gaseous refrigerant stored in the first storage unit can be changed into a liquid phase. As a result, the liquid refrigerant can be stored in the first storage portion, and the liquid refrigerant can be introduced into the second storage portion, thereby increasing the amount of refrigerant circulating through the system.

Further, since the performance of the refrigerant system for compensating the indoor air conditioning load can be varied only by the change in the amount of the refrigerant in the refrigerant cycle without changing the operation rate of the compressor, the advantage that the overall operation efficiency of the refrigerant system step can be improved .

1 is a system diagram showing a configuration of an air conditioner according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a part of the system configuration of Fig. 1. Fig.
3 is a view illustrating a configuration of a refrigerant storage device according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a configuration of a refrigerant storage device according to an embodiment of the present invention.
5 is a cross-sectional view taken along line V-V 'of FIG.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

FIG. 1 is a system diagram showing the configuration of an air conditioner according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a part of the system configuration of FIG.

Referring to FIG. 1, an air conditioner 10 according to an embodiment of the present invention includes an outdoor unit 100 disposed outdoors and an indoor unit disposed in the room. The indoor unit includes an indoor heat exchanger that exchanges heat with air in the indoor space.

The outdoor unit 100 includes a plurality of compressors 110 and 112 and oil separators 120 and 122 disposed at the outlets of the plurality of compressors 110 and 112 for separating oil from refrigerant discharged from the plurality of compressors 110 and 112, .

The plurality of compressors 110 and 112 include a first compressor 110 and a second compressor 112 connected in parallel. For example, the first compressor 110 may be a main compressor, and the second compressor 112 may be a sub-compressor.

Depending on the capabilities of the system, the second compressor 112 may be further operated if the first compressor 110 is operated first and the capability of the first compressor 110 is insufficient. For example, the first compressor 110 and the second compressor 112 may include an inverter compressor.

At the outlet side of the first compressor (110) and the second compressor (112), a discharge pipe (111) extends. The discharge pipe 111 may be provided with a discharge temperature sensor 115 for sensing the temperature of the refrigerant compressed by the first and second compressors 110 and 112.

The oil separators 120 and 122 include a first oil separator 120 disposed at an outlet side of the first compressor 110 and a second oil separator 122 disposed at an outlet side of the second compressor 112 .

The outdoor unit 100 includes an oil recovery flow path 117 for recovering oil from the first and second oil separators 120 and 122 to the first and second compressors 110 and 112, respectively. The oil return flow path 117 may extend from the first oil separator 120 to the first compressor 110 and from the second oil separator 122 to the second compressor 112.

The oil return passage 117 is provided with an oil valve 118 for regulating the amount of oil to be recovered and a guide for guiding the refrigerant unidirectional flow from the first and second oil separators 120 and 122 to the first and second compressors 110 and 112 1 check valve 118a may be installed, respectively.

The outdoor unit 100 further includes a bypass flow path 117a extending from the first and second oil separators 120 and 122 to the recovery flow path 117.

A second check valve 124 may be installed at each outlet of the first and second oil separators 120 and 122. The refrigerant discharged from the first and second oil separators 120 and 122 passes through the second check valve 124 and is then mixed together.

The outdoor unit 100 further includes a high pressure sensor 125 for sensing the high pressure of the compressed refrigerant and a high pressure switch 126 for selectively blocking the flow of the refrigerant according to the pressure sensed by the high pressure sensor 125 do. The high pressure sensor 125 and the high pressure switch 126 may be installed in the piping of the refrigerant piped through the second check valve 124.

The outdoor unit (100) further includes a flow switching unit (130, 135) for switching the flow direction of the refrigerant. The flow switching units 130 and 135 include a first flow switching unit 130 and a second flow switching unit 135 for guiding the refrigerant passing through the high pressure sensor 125 to the outdoor heat exchanger 140 or the indoor unit .

The first and second flow switching units 130 and 135 are connected in series. For example, the first and second flow switching units 130 and 135 may include a four way valve with one inlet closed.

When the air conditioner performs the cooling operation, the refrigerant flows from the first flow switching unit 130 to the outdoor heat exchanger 140, and the refrigerant evaporated in the indoor heat exchanger of the indoor unit flows through the low pressure engine 195 And then flows into the second storage unit 205.

 On the other hand, when the air conditioner performs the heating operation, the refrigerant flows from the second flow switching unit 135 to the indoor heat exchanger side of the indoor unit through the high-pressure orifice 196, and evaporates in the outdoor heat exchanger 140 The refrigerant is introduced into the second storage unit 205 through the first flow switching unit 130. [

The outdoor heat exchanger (140) includes a plurality of heat exchangers (141, 142) and an outdoor fan (143). The plurality of heat exchanging units 141 and 142 include a first heat exchanging unit 141 and a second heat exchanging unit 142 connected in parallel. The refrigerant having passed through the first flow switching unit 130 is restricted by the check valve 145a to flow into the second heat exchanging unit 142 and flows into the first heat exchanging unit 141 .

The outdoor unit 100 is provided with a first heat exchange unit temperature sensor 140a for sensing a refrigerant temperature of the first heat exchange unit 141 and a second heat exchange unit temperature sensor 140 for sensing a refrigerant temperature of the second heat exchange unit 142. [ A sensor 140b and an outdoor temperature sensor 140c for sensing an outdoor temperature.

The outdoor heat exchanger 140 further includes a variable flow channel 144 for guiding the flow of the refrigerant from the outlet side of the first heat exchange unit 141 to the inlet side of the second heat exchange unit 142. The variable flow path 144 extends from the outlet side piping of the first heat exchange section 141 to the inlet side piping of the second heat exchange section 142.

The outdoor heat exchanger (140) is provided with a variable valve (145) provided on the variable flow path (144) to selectively block the flow of the refrigerant. Depending on whether the variable valve 145 is turned on or off, the refrigerant that has passed through the first heat exchanging unit 141 may be selectively introduced into the second heat exchanging unit 142. For example, the variable valve 145 may include a solenoid valve.

More specifically, when the variable valve 145 is opened or opened, the refrigerant having passed through the first heat exchanging unit 141 flows into the second heat exchanging unit 142 through the variable flow path 144. At this time, the first outdoor valve 147a provided on the outlet side piping 147 of the first heat exchanging unit 141 may be closed.

The second outdoor valve 148a is provided at the outlet pipe 148 of the second heat exchanging unit 142 and the refrigerant heat-exchanged at the second heat exchanging unit 142 is discharged through the second outdoor valve 148a The first subcooler 150 may flow into the first subcooler 150 through the first subcooler 150. [

On the other hand, when the variable valve 145 is turned off or closed, the refrigerant flow to the second heat exchanging unit 142 is limited, and the refrigerant that has passed through the first heat exchanging unit 141 flows into the first outdoor valve 147a To the first subcooler (150).

Here, the first outdoor valve 147a and the second outdoor valve 148a may be arranged in parallel corresponding to the arrangement of the first and second heat exchange units 141 and 142. For example, the first and second outdoor valves 147a and 148a may include an electronic expansion valve (EEV) capable of reducing the pressure of the refrigerant.

The first bypass pipe 149a and the second bypass pipe 149b are connected to the outlet side pipe 147 of the first heat exchanging unit 141 and the outlet side pipe 148 of the second heat exchanging unit 142, Respectively.

The first and second bypass pipes 149a and 149b extend from the inlet side of the first flow switching unit 130 to the outlet side pipes 147 and 148 and are connected to the first and second compressors 110 and 112, And the high-pressure refrigerant is selectively bypassed to the outlet side of the first and second heat exchanging units (141, 142). The first bypass valve 149c and the second bypass valve 149d may be installed in the first and second bypass pipes 149a and 149b.

A heat exchange part bypass pipe for bypassing the second outdoor valve 148a and a third check valve 148b for the heat exchange part bypass pipe are connected to the outlet side pipe 148 of the second heat exchange part 142, ).

On the outlet side of the outdoor heat exchanger (140), the first and second subcoolers (150, 170) are disposed. The first and second subcoolers 150 and 170 include a first subcooler 150 and a second subcooler 170.

When the air conditioner operates in the cooling mode, the refrigerant condensed in the outdoor heat exchanger 140 may pass through the first subcooler 150 and the second subcooler 170 in order. On the other hand, when the air conditioner performs the heating operation, the refrigerant that has passed through the second subcooler 170 may be introduced into the first subcooler 150.

The first subcooler 150 can be understood as a first intermediate heat exchanger in which a first refrigerant circulating in the refrigerant system and a refrigerant (a second refrigerant) of the first refrigerant are branched and then heat-exchanged. The second refrigerant heat-exchanged in the first subcooler 150 may be injected into the first and second compressors 110 and 112.

The outdoor unit 100 includes a first subcooling oil passage 151 for branching the second refrigerant and guiding the second subcooler 150 to the first subcooler 150. The first subcooling passage 151 may extend from the first subcooler 150 to the first and second compressors 110 and 112.

The first supercooling flow path (151) is provided with a first supercooling expansion device (153) for reducing the pressure of the second refrigerant. The first subcooling expansion device 153 may include an EEV (Electric Expansion Valve).

The first subcooling flow path (151) is provided with a plurality of temperature sensors (154, 155). The plurality of temperature sensors 154 and 155 are provided with a first temperature sensor 154 for sensing the temperature of the refrigerant before being introduced into the first subcooler 150 and a second temperature sensor 154 for detecting the temperature of the refrigerant after passing through the first subcooler 150 And a second temperature sensor 155 for sensing the temperature.

During the heat exchange of the first refrigerant and the second refrigerant in the first sub-cooling unit 150, the first refrigerant may be sub-cooled and the second refrigerant may be heated.

The "first superheat degree" of the second refrigerant can be recognized based on the temperature values of the refrigerant sensed by the first temperature sensor 154 and the second temperature sensor 155, respectively. For example, a value obtained by subtracting the temperature value sensed by the first temperature sensor 154 from the sensed temperature value by the second temperature sensor 155 may be recognized as the "first superheat degree ".

The second refrigerant heat-exchanged in the first subcooler 150 may be branched and injected into the first compressors 110 and 112. Therefore, the first subcooling flow path 151 may be referred to as a "first injection flow path ".

In detail, the first subcooling passage 151 may be branched to the first branch passage 156a and the second branch passage 156b and connected to the first and second compressors 110 and 112, respectively. The first branch passages 156a and 156b may be understood as the first injection passages.

A part of the refrigerant in the first subcooling flow path 151 exchanged in the first subcooler 150 may be injected into the first injection port of the first compressor 110 through the first branch flow path 156a have. The other part of the refrigerant in the first supercooling passage 151 that has been heat-exchanged in the first subcooler 150 passes through the second branch passage 156b to the first injection port of the second compressor 112, Lt; / RTI >

At this time, the refrigerant injected into the first and second compressors 110 and 112 is higher than the intermediate pressure, that is, the suction pressure of the compressor, and can form a pressure lower than the discharge pressure.

On the outlet side of the first subcooler (150), a first branched portion (158) is provided. The first refrigerant passed through the first subcooler 150 is branched by the first branched portion 158 and a part of the refrigerant flows into the electric field cooling portion 159 while the other portion flows into the first storage portion 201 . The electric-field cooling unit 159 may cool the heat-generating component through one side of the electric field portion where the heat-generating component is installed.

The second subcooler (170) is disposed at the outlet side of the electric field cooling unit (159). The first subcooler 150, the electric-field cooling unit 159, and the second subcooler 170 may be arranged in series.

The first refrigerant heat-exchanged in the first subcooler 150 flows into the second subcooler 170 through the electric-field cooling unit 159 on the basis of the cooling operation. On the other hand, on the basis of the heating operation, the refrigerant heat-exchanged in the second subcooler 170 may be introduced into the first subcooler 150 via the electric-field cooling unit 159.

The second subcooler 170 can be understood as a first intermediate refrigerant circulating in the refrigerant system and a second intermediate heat exchanger in which a part of the refrigerant in the refrigerant (second refrigerant) is branched and then heat-exchanged.

The outdoor unit (100) includes a second supercooling oil passage (171) through which the second refrigerant is branched. The supercooling passage 171 is provided with a supercooling expansion device 173 for reducing the pressure of the second refrigerant. The supercooling expansion device 173 may include an EEV (Electric Expansion Valve).

In the second subcooling passage 171, a plurality of temperature sensors 174 and 175 are provided. The plurality of temperature sensors 174 and 175 are provided with a third temperature sensor 174 for sensing the temperature of the refrigerant before being introduced into the second subcooler 170 and a third temperature sensor 174 for detecting the temperature of the refrigerant after passing through the second subcooler 170 And a fourth temperature sensor 175 for sensing the temperature.

During the heat exchange of the first refrigerant and the second refrigerant in the supercooling heat exchanger 170, the first refrigerant may be sub-cooled and the second refrigerant may be heated.

The "second superheat degree" of the second refrigerant can be recognized based on the temperature values of the refrigerant sensed by the third temperature sensor 174 and the fourth temperature sensor 175, respectively. For example, a value obtained by subtracting the temperature value sensed by the third temperature sensor 174 from the temperature value sensed by the fourth temperature sensor 175 may be recognized as the "second superheat degree ".

The second refrigerant heat-exchanged in the second subcooler 170 may be injected into the first and second compressors 110 and 112 or may be bypassed to the second storage unit 205.

In detail, the second supercooling passage 171 is provided with second injection passages 176a and 176 for injecting the coolant into the first and second compressors 110 and 112, and bypasses the coolant to the second storage portion 205 And a second branched portion 182 branching to the bypass flow path 181 for performing the above-described operation.

The second injection channel 176 includes a third branch channel 176a and a fourth branch channel 176b extending to the first and second compressors 110 and 112, respectively. The third branch passage 176a may be connected to a second injection port of the first compressor 110 and the fourth branch passage 176b may be connected to a second injection port of the second compressor 112 .

The third and fourth branched flow paths 176a and 176b may be provided with an injection valve 177 capable of controlling the flow rate of the refrigerant. The injection valve 177 may include an electronic expansion valve (EEV) capable of controlling opening degree.

A part of the refrigerant of the second supercooling passage 171 which is heat-exchanged in the second subcooler 170 is branched from the second branching portion 182 and flows through the third branching passage 176a to the first compressor 110 Lt; RTI ID = 0.0 > injection port. ≪ / RTI >

Another part of the refrigerant branched from the second branch 182 may be injected into the second injection port of the second compressor 112 via the fourth branch passage 176b. At this time, the injected refrigerant is higher than the intermediate pressure, that is, the suction pressure of the compressor, and can form a pressure lower than the discharge pressure.

Referring to FIG. 2, the air conditioner 10 further includes a refrigerant storage device 200 capable of storing refrigerant. The refrigerant storage device 200 can be understood as a configuration capable of flowing refrigerant circulating through the refrigerant system and storing at least a part of the stored refrigerant into the compressors 110 and 112.

The refrigerant storage device 200 includes a first storage unit 201 and a second storage unit 205.

The second storage unit 205 is configured to separate the gaseous refrigerant before the refrigerant is introduced into the compressors 110 and 112.

The air conditioner 10 further includes a low pressure pipe 184 extending from the first and second flow switching units 130 and 135 to the second storage unit 205. The low-pressure refrigerant evaporated in the refrigerant cycle can be introduced into the second storage portion 205 from the first flow switching portion 130 or the second flow switching portion 135 via the low-pressure pipe 184 .

The second storage unit 205 includes an inlet port 211 to which the low pressure pipe 184 is connected and a supercooling port 212 to which the bypass flow path 181 is connected. The bypass passage 181 may extend from the second branch 182 to the supercooling port 212 of the second reservoir 205.

The bypass passage 181 is provided with a bypass valve 183 for selectively interrupting the flow of the refrigerant. The amount of the refrigerant flowing into the second storage part 205 can be adjusted according to on / off or opening of the bypass valve 183. For example, the bypass valve 183 may include a solenoid valve.

The first storage unit 201 is understood as a configuration capable of storing at least a part of the refrigerant circulating through the system.

The outdoor unit 100 further includes a receiver inlet pipe 163 connected to the inlet of the first storage unit 201. The receiver inlet pipe 163 may extend from the first branch 158 to the first reservoir 201.

The receiver inlet pipe 163 is provided with a receiver inlet valve 164a for regulating the flow of refrigerant. When the receiver inlet valve 164a is opened, at least a portion of the refrigerant circulating in the system may be introduced into the first storage unit 201. [ For example, the receiver inlet valve 164a may include a solenoid valve.

The receiver inlet pipe 163 is provided with a pressure reducing device 164b to reduce the pressure of the refrigerant flowing into the receiver 162. [ For example, the decompression apparatus may include a capillary tube. In the course of the refrigerant passing through the decompression device 164b, the flow rate or flow rate of the refrigerant can be reduced.

The outdoor unit 100 further includes a receiver outlet pipe 260 extending from the first storage unit 201 to the second storage unit 205. At least a portion of the refrigerant stored in the first storage unit 201 may be introduced into the second storage unit 205 through the receiver outlet pipe 260.

The air conditioner 10 is provided with a liquid discharge port 261 provided in the first storage unit 201 and to which the receiver outlet pipe 260 is connected and a liquid discharge port provided in the second storage unit 205, And a liquid inlet port 262 to which the outlet pipe 260 is connected.

For example, the liquid discharge port 261 is located at a lower portion of the first reservoir 201 and is connected to one side of the receiver outlet pipe 260, and the liquid inlet port 262 is connected to the second reservoir And the other side of the receiver outlet pipe 260 may be connected.

The receiver outlet pipe 260 is provided with a receiver outlet valve 264 capable of regulating the amount of refrigerant discharged from the first reservoir 201. The amount of refrigerant flowing into the second reservoir 205 may be adjusted according to the on / off or opening of the receiver outlet valve 264.

The refrigerant stored in the first storage unit 201 of the refrigerant storage device 200 may be introduced into the second storage unit 205 when the receiver outlet valve 264 is opened. In one example, the receiver outlet valve 264 may include a solenoid valve.

The air conditioner 10 further includes a suction pipe 169 extending from the second storage unit 205 to the first and second compressors 110 and 112 to guide the suction of the refrigerant into the compressor. The suction pipe 169 may be coupled to the outlet port 215 of the refrigerant storage device 200.

The suction pipe 169 may be branched and connected to a first port of the first compressor 110 and a first port of the second compressor 112.

The suction pipe 169 may be provided with a low pressure sensor 169d for sensing the pressure of the refrigerant flowing into the first and second compressors 110 and 112, that is, the low pressure of the system.

The air conditioner 10 further includes an oil return pipe 190 extending from the second storage unit 205 to the suction pipe 169. The oil stored in the second storage unit 205 may be introduced into the suction pipe 169 through the oil return pipe 190. The oil return pipe 190 may be coupled to the oil discharge port 218 of the refrigerant storage device 200.

The oil return pipe 190 may be provided with an oil valve 191 for adjusting the oil flow rate. For example, the oil valve 191 may include a solenoid valve.

The air conditioner 10 further includes an oil supply pipe 119 for supplying oil in the first and second compressors 110 and 112 to the suction pipe 169. The oil supply pipe 119 extends from the first and second compressors 110 and 112 and is connected to the suction pipe 169.

Meanwhile, the first refrigerant passing through the second subcooler 170 may flow into the indoor unit through the liquid pipe 197. The liquid pipe 197 may be provided with a liquid pipe temperature sensor 198 for sensing the temperature of the liquid refrigerant flowing through the liquid pipe 197.

4 is a cross-sectional view illustrating a configuration of a refrigerant storage device according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of the refrigerant storage device taken along line VV ' Fig.

3 to 5, a refrigerant storage device 200 according to an embodiment of the present invention includes a main body or case 210 for forming refrigerant storage spaces 201 and 205, And a partition plate 220 for partitioning. An upper cover 213 is provided on the upper side of the case 210 and a lower cover 214 is provided on the lower side of the case 210. Below the lower cover 214, a mount 270 is provided to allow the refrigerant storage device 200 to be installed in a predetermined place.

The storage spaces 201 and 205 include a first storage unit 201 defined on the upper side of the partition plate 220 and a second storage unit 205 defined on the lower side of the partition plate 220. The volume of the second storage unit 205 may be larger than the volume of the first storage unit 201.

The case 210 may be configured to have a substantially cylindrical shape with upper and lower openings. The case 210 includes a first case 210a forming the first storage unit 201 and a second case 210b forming the second storage unit 105. [ That is, a portion of the case 210 disposed on the upper side of the partition plate 220 is referred to as the first case 210a and a portion disposed below the partition plate 220 is referred to as the second case 210b ). The first and second cases 210a and 210b may be integrally formed.

The first case 210a is connected to the receiver inlet pipe 163 and has a connection port 251 for introducing the refrigerant from the receiver inlet pipe 163 to the first storage unit 201, And a liquid discharge port 261 coupled to the pipe 260 for guiding the liquid refrigerant present in the first reservoir 201 to the second reservoir 205. For example, the connection port 251 may be provided at an upper portion of the first case 210a, and the liquid discharge port 261 may be provided at a lower portion of the first case 210a.

The second case 210b includes a liquid inlet port 262 through which the receiver outlet pipe 260 is coupled to introduce the liquid refrigerant discharged from the liquid discharge port 261. For example, the liquid inlet port 262 may be installed above the second case 210b. The receiver outlet pipe 260 is provided between the liquid outlet port 261 and the liquid inlet port 262. The receiver outlet pipe 260 may extend downward from the liquid discharge port 261 toward the liquid discharge port 262.

Since the liquid discharge port 261 can be installed at a position higher than the liquid inlet port 262, the liquid refrigerant stored in the first storage unit 201 can be supplied to the liquid discharge port 262 using the natural gradient, 2 storage unit 205, as shown in FIG.

The receiver outlet pipe 260 is provided with an outer pipe portion 260a disposed outside the second storage portion 205 and an outer pipe portion 260b extending from the outer pipe portion 260a and disposed inside the second storage portion 205 And an inner pipe portion 260b to be disposed. The outer pipe portion 260a extends in the normal direction of the case 210 and is coupled to the case 210. [

The inner pipe portion 260b may be configured to be bent in one direction inside the second storage portion 205. The one direction may be understood as a direction away from the suction pipe 169. [ The inner pipe portion 260b is configured to be bent so that the liquid refrigerant supplied to the inside of the case 210 can flow in a direction away from the suction pipe 169. [ Therefore, the liquid refrigerant can be prevented from flowing into the suction pipe 169 through which the gaseous refrigerant should flow.

The second case 210b includes an inlet port 211 through which the low pressure pipe 184 is coupled to introduce the refrigerant into the second storage unit 205. For example, the inlet port 211 may be installed on the upper portion of the second case 210b. The refrigerant flowing through the inlet port 211 is a vaporized refrigerant having a high degree of dryness and may be stored in the second storage unit 205.

The lower cover 214 includes an outlet port 215 to which the suction pipe 169 is coupled. The suction pipe 169 includes a first pipe portion 169a located inside the second case 210b and a second pipe portion 169b located outside the second case 210b. That is, the first pipe 169a may be located inside the outlet port 215, and the second pipe 169b may be located outside the outlet port 215.

The first pipe portion 169a extends upward from the lower cover 214 toward the partition plate 220. [ The first pipe portion 235a is formed with an inlet end portion 169c through which the refrigerant existing in the second storage portion 205 flows. Since the gaseous refrigerant must flow into the first pipe portion 169a, the inlet end portion 169c may be positioned at a height adjacent to the partition plate 220, that is, on the uppermost side of the second storage portion 205 have.

The inlet end 169c may extend obliquely with respect to a horizontal plane, e.g., the lower cover 214 at a set angle [theta]. Since the inlet end 169c is located at a height adjacent to the partition plate 220, the flow of refrigerant toward the inlet end 169c may be restricted. Therefore, by forming the inflow end 169c obliquely, the cross-sectional area of the inflow end 169c can be increased, and the inflow of the coolant can be smooth. For example, the setting angle? May be in the range of 20 to 40 degrees.

The second pipe portion 169b may extend downward through the outlet port 215 of the lower cover 214 and then be bent upward to extend toward the compressor 110. [

The lower cover 214 is formed with an oil discharge port 218 through which oil stored in the second storage unit 205 can be discharged. The oil return pipe 190 extends from the oil discharge port 218 to the suction pipe 169. The refrigerant discharged from the oil discharge port 218 may be returned to the compressors 110 and 112 via the oil return pipe 190 and the suction pipe 169. The oil valve 191 is installed in the oil return pipe 217 to control the discharge amount of the oil.

The second case 210b includes a subcooling port 212 to which the bypass flow path 181 is connected. The refrigerant flowing through the bypass passage 181 is directly supplied to the second storage portion 205 having a relatively large volume, so that the flow noise of the refrigerant can be reduced. If the refrigerant flowing through the bypass passage 181 is supplied to the suction pipe 169 having a relatively small volume, the flow noise of the refrigerant may be largely generated.

On the other hand, the refrigerant flowing through the low-pressure pipe 184 is a refrigerant vaporized in the evaporator, and therefore, it is understood as a refrigerant having a high degree of quality that forms a low pressure (evaporation pressure) on the refrigerant system. On the other hand, since the refrigerant introduced through the receiver inlet pipe 163 is a subcooled refrigerant in the first subcooler 150, it can be understood as a liquid refrigerant forming a high pressure (condensation pressure) do.

Therefore, the refrigerant stored in the first storage unit 201 and the refrigerant stored in the second storage unit 205 can be heat-exchanged through the partition plate 220. In detail, the refrigerant in the first storage part 201 forming the relatively high temperature and high pressure is cooled and the refrigerant in the second storage part 205 forming the relatively low temperature and low pressure can be absorbed.

During the cooling of the refrigerant in the first storage part 201, the gaseous refrigerant in the refrigerant flowing through the receiver inlet pipe 163 can be condensed. Therefore, the first storage unit 201 may be filled with liquid refrigerant, and such liquid refrigerant may be supplemented to the refrigerant system according to a predetermined condition. The refrigerant in the second storage part 205 may be phase-changed into a gaseous state by absorbing heat by the refrigerant in the first storage part 201. The phase-change gaseous refrigerant can be sucked into the compressor (110, 112) through the suction pipe (169).

The first storage unit 201 may be referred to as a "receiver" in that refrigerant is supplied to the second storage unit 205 after temporarily storing the condensed refrigerant, May be referred to as a "gas-liquid separator" in that gas-phase refrigerant in the evaporated refrigerant flows into the compressors 110 and 112. [ Therefore, the refrigerant storage device 200 can be understood as an apparatus configured as an integrated unit of a receiver and a gas-liquid separator.

The refrigerant flow in the air conditioner 100 according to the present embodiment will be briefly described.

The refrigerant compressed in the compressors 110 and 112 flows into the outdoor heat exchanger 140 or the indoor heat exchanger and is condensed. At least a portion of the branch refrigerant in the condensed refrigerant flows into the first subcooler 150 and the heat is exchanged in the first subcooler 150 to the receiver inlet pipe 163 and the first case 210a, May be introduced into the first storage unit 201 via the connection port 251 of the first storage unit 201.

At least a part of the refrigerant heat-exchanged in the second subcooler 170 passes through the bypass passage 181 and the supercooling port 212 of the second case 210b, 205, respectively. At this time, since the refrigerant flowing through the bypass flow path 181 is supplied to the second storage part 205 having a relatively large volume, the generation of noise due to the refrigerant flow can be reduced.

The refrigerant evaporated in the outdoor heat exchanger 130 or the indoor heat exchanger flows into the second storage portion 205 via the low pressure pipe 184 and the inlet port 211 of the second case 210b .

The liquid refrigerant stored in the first reservoir 201 flows to the second reservoir 205 through the receiver outlet pipe 260. At this time, since the liquid discharge port 261 of the first case 210a is installed at a position higher than the liquid inlet port 262 of the second case 210b, the flow of the refrigerant can be smoothly performed.

On the other hand, the refrigerant stored in the second reservoir 205 is discharged to the suction pipe 169 through the outlet port 215 and can be sucked into the compressors 110 and 112. The oil stored in the second reservoir 205 flows to the suction pipe 169 through the oil discharge port 218 and may be returned to the compressors 110 and 112 together with the refrigerant.

10: outdoor unit 110, 112: compressor
125: high-pressure sensor 130, 135: first and second flow-
140: outdoor heat exchanger 150: first subcooler
151: first injection channel 153: first injection expansion device
163: Receiver inlet piping 169: Suction piping
170: second supercooler 171: supercooling flow path
173: supercooling expansion device 184: low pressure piping
190: Oil return pipe 200: Refrigerant storage device
201: first storage unit 205: second storage unit
210: Case 210a: First case
210b: second case 211: inlet port
212: supercooling port 215: outlet port
218: Oil discharge port 220:
251: connection port 260: receiver outlet piping
261: liquid discharge port 262: liquid discharge port

Claims (17)

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed in the compressor;
An expansion device for reducing the pressure of the refrigerant condensed in the condenser;
An evaporator for evaporating the refrigerant decompressed in the expansion device; And
And a refrigerant storage device for bypassing and storing at least a portion of the refrigerant condensed in the condenser,
In the refrigerant storage device,
A first storage unit for storing the bypassed refrigerant; And
And a second storage portion for discharging the gaseous refrigerant of the introduced refrigerant into the compressor,
Wherein the first storage unit is disposed above the second storage unit, and the refrigerant in the first storage unit can be supplied to the second storage unit. The method according to claim 1,
Further comprising a receiver outlet pipe extending from the first storage portion toward the second storage portion and guiding the refrigerant in the first storage portion to flow to the second storage portion by a natural gradient. 3. The method of claim 2,
A liquid discharge port provided in the first reservoir and connected to one side of the receiver outlet pipe; And
Further comprising a liquid inlet port provided in the second storage unit and coupled to the other side of the receiver outlet pipe. The method of claim 3,
Wherein the liquid discharge port is disposed at a lower portion of the first storage portion, and the liquid inlet port is disposed at an upper portion of the second storage portion. 3. The method of claim 2,
Further comprising a receiver outlet valve installed at the receiver outlet pipe for controlling the amount of refrigerant discharged from the first storage unit. 3. The method of claim 2,
A case forming the first storage unit and the second storage unit; And
Further comprising a partition plate that is disposed inside the case and that divides the first storage unit and the second storage unit. The method according to claim 6,
In the case,
A first case defining the first storage unit and a second case defining the second storage unit,
Wherein the first and second cases are integrally formed. 8. The method of claim 7,
A suction pipe installed inside the second case and guiding the refrigerant in the second storage part to the compressor; And
And a lower cover provided at a lower portion of the case and having an outlet port to which the suction pipe is connected. 8. The method of claim 7,
In the suction pipe,
A first pipe portion located inside the second case and extending upward toward the partition plate; And
And a second piping portion located outside the second case and extending upwardly from the lower cover. 10. The method of claim 9,
In the first piping portion,
Wherein an inlet end portion of the second storage portion that is located above the second storage portion and into which the refrigerant existing in the second storage portion flows is formed. 11. The method of claim 10,
Wherein the inflow end portion extends obliquely with respect to the lower cover at a set angle [theta]. 3. The method of claim 2,
The receiver outlet pipe includes an outer pipe portion disposed outside the second storage portion and an inner pipe portion extending from the outer pipe portion and disposed inside the second storage portion,
Wherein the inner pipe portion is bent in a direction away from the suction pipe. The method according to claim 1,
A first subcooler for supercooling the refrigerant condensed in the condenser;
A receiver inlet pipe for guiding the refrigerant passed through the first subcooler to the first storage unit; And
Further comprising a receiver inlet valve installed in the receiver inlet pipe. 9. The method of claim 8,
An oil discharge port formed in the lower cover for discharging the refrigerant stored in the second storage part;
An oil return pipe extending from the oil discharge port to the suction pipe; And
And an oil valve installed in the oil return pipe to adjust an oil flow rate. A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed in the compressor;
A first subcooler for supercooling the refrigerant condensed in the condenser;
A second subcooler disposed at an outlet side of the first subcooler;
A receiver having a connection port through which at least a part of the refrigerant passing through the first subcooler is introduced;
A gas-liquid separator into which at least a part of the refrigerant passing through the second subcooler is introduced; And
And a receiver outlet pipe extending downward from the receiver toward the gas-liquid separator and guiding the liquid refrigerant in the receiver to be introduced into the gas-liquid separator. 16. The method of claim 15,
Further comprising a receiver outlet valve installed in the receiver outlet pipe. 17. The method of claim 16,
Wherein the receiver and the gas-liquid separator are integrally formed, and are separated upward and downward by the partition plate.
KR1020150063718A 2014-12-17 2015-05-07 An air conditioner KR101695543B1 (en)

Priority Applications (3)

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CN201510514654.0A CN105716307B (en) 2014-12-17 2015-08-20 Air regulator
US14/935,089 US10041705B2 (en) 2014-12-17 2015-11-06 Outdoor device for an air conditioner
EP15195631.5A EP3034962B1 (en) 2014-12-17 2015-11-20 Air conditioner

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KR1020140182091 2014-12-17
KR20140182091 2014-12-17

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KR20190091093A (en) * 2018-01-26 2019-08-05 엘지전자 주식회사 An air conditioner
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