CN113266965A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN113266965A
CN113266965A CN202110190140.XA CN202110190140A CN113266965A CN 113266965 A CN113266965 A CN 113266965A CN 202110190140 A CN202110190140 A CN 202110190140A CN 113266965 A CN113266965 A CN 113266965A
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CN
China
Prior art keywords
heat exchanger
refrigerant
pipe
outdoor heat
row
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN202110190140.XA
Other languages
Chinese (zh)
Inventor
廉亨烈
赵殷晙
尹必铉
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LG Electronics Inc
Original Assignee
LG Electronics Inc
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Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of CN113266965A publication Critical patent/CN113266965A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • 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
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
    • F24F1/14—Heat exchangers specially adapted for separate 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
    • F24F1/30—Refrigerant piping for use inside the separate 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
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0232—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses
    • F25B2313/02322—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses during defrosting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The present invention relates to an air conditioner, which comprises: a defrosting bypass pipe having one end connected to a middle position of the outdoor heat exchanger and the other end connected to an inlet pipe of the compressor; a defrosting bypass valve disposed in the defrosting bypass pipe; and a processor that opens and closes the defrost bypass valve according to the temperature of the refrigerant in the outdoor heat exchanger, opens the defrost bypass valve when a defrost operation is started, thereby bypassing a part of the refrigerant in the outdoor heat exchanger to an inlet pipe of the compressor, and closes the defrost bypass valve when the temperature of the refrigerant in the outdoor heat exchanger is equal to or higher than a reference temperature, thereby securing a defrost performance at an initial stage of the defrost operation.

Description

Air conditioner
Technical Field
The present invention relates to an air conditioner, and more particularly, to an air conditioner installed in a cold district.
Background
Generally, an air conditioner is an apparatus for cooling or heating indoor air using a refrigeration cycle apparatus including a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger.
In the case of cooling the indoor air, the outdoor heat exchanger functions as a condenser, the indoor heat exchanger functions as an evaporator, and the refrigerant circulates through the compressor, the outdoor heat exchanger, the expansion mechanism, the indoor heat exchanger, and the compressor in this order.
In the case of heating the indoor air, the outdoor heat exchanger functions as an evaporator, the indoor heat exchanger functions as a condenser, and the refrigerant circulates through the compressor, the indoor heat exchanger, the expansion mechanism, the outdoor heat exchanger, and the compressor in this order.
When the indoor air is heated, a defrosting operation may be performed as necessary. In the case of heating indoor air, refrigerant having a lower temperature than the outside air flows in the outdoor heat exchanger, and absorbs heat from the outside air. In this process, moisture contained in the outside air may be condensed on the surface of the outdoor heat exchanger, and in a cold region, there may be a case where icing occurs on the surface of the outdoor heat exchanger. When the surface of the outdoor heat exchanger is frozen, heat exchange is not sufficiently performed, and thus there is a problem that heating efficiency is lowered. Thus, it is necessary to remove the frozen ice by performing the defrosting operation as needed.
In general, in the defrosting operation, the refrigerant circulates in a direction opposite to that in the heating operation, which is similar to the circulation direction of the refrigerant in the cooling operation. However, the temperature of the refrigerant during the defrosting operation is always lower than the temperature of the refrigerant during the cooling operation, and the temperature of the refrigerant flowing from the inlet pipe of the compressor is very low and the pressure of the refrigerant is also very low. Therefore, the rotation speed (Hz) of the compressor is inevitably reduced, and as a result, there is a problem that the defrosting operation performance is deteriorated.
In particular, in air conditioners which are widely used at present, various members are provided in the refrigerant flow path in order to provide various operation modes, and therefore, there is a problem that the pressure loss increases as the refrigerant passes through a plurality of the members. In addition, in the case of a cooling/heating dual-purpose air conditioner, in order to ensure cooling performance, the diameter of a refrigerant pipe disposed at the outlet end of the outdoor heat exchanger is designed to be small, which causes a problem that pressure loss increases and defrosting performance decreases.
Disclosure of Invention
The present invention provides an air conditioner that maintains defrosting operation performance by increasing the pressure of a refrigerant in an inlet pipe of a compressor at the initial stage of defrosting operation.
Another object of the present invention is to provide an air conditioner that can quickly defrost ice frozen in an outdoor heat exchanger by minimizing a pressure loss occurring when a refrigerant flows.
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.
In order to achieve the above object, an air conditioner according to the present invention includes: a compressor for compressing a refrigerant; an indoor heat exchanger disposed in a pipe connected to the compressor and configured to exchange heat between the refrigerant and indoor air; an outdoor heat exchanger disposed in a pipe connected to the compressor and disposed in a pipe different from the pipe in which the indoor heat exchanger is disposed, the outdoor heat exchanger being configured to exchange heat between the refrigerant and outdoor air; and an expansion mechanism that is disposed in a pipe connecting the indoor heat exchanger and the outdoor heat exchanger and expands the refrigerant. Further comprising: a bypass defrosting pipe (bypass) having one end connected to a middle position of the outdoor heat exchanger and the other end connected to an inlet pipe of the compressor; a defrosting bypass valve disposed in the defrosting bypass pipe; and a processor that opens and closes the defrost bypass valve in accordance with a temperature of the refrigerant flowing into the compressor from the inlet pipe of the compressor.
Further, an air conditioner according to the present invention includes: a compressor for compressing a refrigerant; an indoor heat exchanger disposed in a pipe connected to the compressor and configured to exchange heat between the refrigerant and indoor air; an outdoor heat exchanger disposed in a pipe connected to the compressor and disposed in a pipe different from the pipe in which the indoor heat exchanger is disposed, the outdoor heat exchanger being configured to exchange heat between the refrigerant and outdoor air; and an expansion mechanism that is disposed in a pipe connecting the indoor heat exchanger and the outdoor heat exchanger and expands the refrigerant. Further comprising: a defrosting bypass pipe having one end connected to a middle position of the outdoor heat exchanger and the other end connected to an inlet pipe of the compressor; and a defrost bypass valve disposed in the defrost bypass pipe.
The outdoor heat exchanger may include: a first row in which a pipe (tube) connected to a pipe connected to a compressor is disposed; a third row in which a tube (tube) connected to a pipe connected to the expansion mechanism is disposed; and a second row arranged between the first row and the third row, wherein tubes for connecting the tubes of the first row and the tubes of the third row are arranged in the second row, and the defrost bypass pipe may be connected to the tubes arranged in the second row.
In the outdoor heat exchanger, the flow direction of the refrigerant on the first bank may be opposite to the flow direction of the refrigerant on the second bank.
In the outdoor heat exchanger, the lower ends of the tubes of the second row and the tubes of the first row may communicate with each other, and the upper ends of the tubes of the second row and the tubes of the third row may communicate with each other.
The processor may open the defrost bypass valve in a case where the temperature of the refrigerant of the outdoor heat exchanger is lower than a preset temperature, and may close the defrost bypass valve in a case where the temperature of the refrigerant of the outdoor heat exchanger is equal to or higher than the preset temperature.
An accumulator may also be included, the accumulator being disposed between the indoor heat exchanger and the compressor. At this time, the defrost bypass pipe may include: a common bypass pipe connected to the outdoor heat exchanger; a first bypass pipe which branches from the common bypass pipe and is connected to an inlet pipe of the compressor; and a second bypass pipe that branches from the common bypass pipe and is connected to the inlet pipe of the accumulator.
The defrost bypass valve may include: a first bypass valve disposed in the first bypass pipe; and a second bypass valve disposed in the second bypass pipe.
The processor may selectively open and close the first bypass valve or the second bypass valve according to a temperature of the refrigerant in the outdoor heat exchanger.
The processor may open the second bypass valve in a case where the temperature of the refrigerant of the outdoor heat exchanger is lower than a preset reference temperature, and may close the second bypass valve in a case where the temperature of the refrigerant of the outdoor heat exchanger is equal to or higher than the preset temperature.
In a method of controlling an air conditioner according to the present invention, the air conditioner includes a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger, and the method includes: a high-speed defrosting operation step of opening a defrost bypass valve disposed in a defrost bypass pipe, one end of which is connected to a middle position of the outdoor heat exchanger and the other end of which is connected to an inlet pipe of the compressor; and a normal defrosting operation step of closing the defrosting bypass valve when the temperature of the refrigerant in the outdoor heat exchanger is equal to or higher than a reference temperature.
The defrost bypass piping may include: a common bypass pipe connected to the outdoor heat exchanger; a first bypass pipe which branches from the common bypass pipe and is connected to an inlet pipe of the compressor; and a second bypass pipe branching from the common bypass pipe and connected to an inlet pipe of the accumulator, wherein the high-speed defrosting step may include: and selectively opening and closing a first bypass valve disposed in the first bypass pipe or a second bypass valve disposed in the second bypass pipe according to the temperature of the outdoor heat exchanger.
In the high-speed defrosting step, the second bypass valve may be opened in a case where the temperature of the refrigerant of the outdoor heat exchanger is lower than a preset reference temperature, and may be closed in a case where the temperature of the refrigerant of the outdoor heat exchanger is equal to or higher than the preset reference temperature.
Specific matters related to other embodiments are included in the detailed description and the accompanying drawings.
According to the air conditioner of the present invention, one or more of the following effects can be obtained.
First, there is an advantage in that a pressure of the refrigerant flowing into the compressor from the inlet pipe of the compressor can be secured at the initial stage of the defrosting operation by branching a part of the refrigerant from the intermediate position of the outdoor heat exchanger and bypassing the refrigerant to the inlet pipe of the compressor at the initial stage of the defrosting operation, and thus the defrosting performance can be maintained.
Secondly, there is an advantage that a part of the refrigerant is branched from an intermediate position of the outdoor heat exchanger, and thus the refrigerant is directly bypassed to the inlet pipe of the compressor without passing through other plural components, thereby minimizing the pressure loss of the refrigerant.
Third, according to the second embodiment, there is an advantage that performance can be ensured by separating the condensed refrigerant existing in the part of the branched refrigerant by bypassing the part of the refrigerant branched from the common bypass valve to the inlet pipe of the accumulator and guiding only the gasified refrigerant to the compressor.
The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the description in the claims.
Drawings
Fig. 1 is a configuration diagram illustrating a heating operation of an air conditioner according to a first embodiment.
Fig. 2 is a configuration diagram showing a cooling operation of the air conditioner of fig. 1.
Fig. 3 is a diagram showing a structure during a defrosting operation of the air conditioner of fig. 1.
Fig. 4 is a control block diagram of the air conditioner of fig. 1.
Fig. 5 is a diagram showing the configuration of the air conditioner according to the second embodiment during defrosting operation.
Fig. 6 is a control block diagram of the air conditioner of fig. 5.
Description of the reference numerals
1: the compressor 2: outdoor heat exchanger
3: the expansion mechanism 4: indoor heat exchanger
8: liquid storage device
81: first refrigerant pipe 82: second refrigerant piping
83: third refrigerant pipe 84: fourth refrigerant pipe
85: compressor inlet piping 86: bypass piping
87: the defrost bypass valve 300: processor with a memory having a plurality of memory cells
Detailed Description
The advantages, features and methods of implementing the present invention will become more apparent with reference to the accompanying drawings and detailed description of the embodiments. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and the embodiments are only for the purpose of more fully disclosing the present invention, so as to more fully suggest the scope of the present invention to those skilled in the art to which the present invention pertains, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals denote the same constituent elements.
The present invention will be described below with reference to the drawings, which illustrate an air conditioner according to an embodiment of the present invention.
< air conditioner >
Fig. 1 is a configuration diagram of an air conditioner showing an embodiment of the present invention.
Referring to fig. 1, an air conditioner of an embodiment of the present invention may include a compressor 1, an outdoor heat exchanger 2, an expansion mechanism 3, and an indoor heat exchanger 4.
The compressor 1, the outdoor heat exchanger 2, the expansion mechanism 3, and the indoor heat exchanger 4 may be connected by a plurality of refrigerant pipes.
The compressor 1, the outdoor heat exchanger 2, and the expansion mechanism 3 may constitute an outdoor unit. The outdoor unit may include an outdoor blower (not shown) for blowing air toward the outdoor heat exchanger 2. By the rotation operation of the outdoor fan, the outdoor air can flow into the outdoor unit, and can be discharged to the outside after exchanging heat with the outdoor heat exchanger 2.
The indoor heat exchanger 4 may constitute an indoor unit. The indoor unit may further include an indoor blower (not shown) for blowing air toward the indoor heat exchanger 4. By the rotation operation of the indoor blower, the indoor air can flow into the indoor unit and can be discharged into the room after exchanging heat with the indoor heat exchanger 4.
When the air conditioner is in a cooling operation, the outdoor heat exchanger 2 can function as a condenser, and the indoor heat exchanger 4 can function as an evaporator. When the air conditioner performs a cooling operation, the refrigerant may circulate through the compressor 1, the outdoor heat exchanger 2, the expansion mechanism 3, the indoor heat exchanger 4, and the compressor 1 in this order.
When the air conditioner is in a heating operation, the outdoor heat exchanger 2 may function as an evaporator, and the indoor heat exchanger 4 may function as a condenser. When the air conditioner performs a heating operation, the refrigerant may circulate through the compressor 1, the indoor heat exchanger 4, the expansion mechanism 3, the outdoor heat exchanger 2, and the compressor 1 in this order.
The compressor 1 can compress a refrigerant. The condenser may condense the refrigerant passing through the compressor 1. The expansion mechanism 3 can expand the refrigerant passing through the condenser. The evaporator may evaporate the refrigerant passing through the expansion mechanism 3.
The air conditioner may be configured to perform both cooling operation and heating operation. However, the air conditioner may be configured as an air conditioner that can perform only a heating operation.
Hereinafter, the air conditioner constituted by the air conditioner capable of both the cooling operation and the heating operation will be described.
The air conditioner of the embodiment of the present invention may further include a cooling and heating switching valve 7. The cooling/heating switching valve 7 may constitute the outdoor unit. The cooling/heating switching valve 7 can switch the flow of the refrigerant discharged from the compressor 1 to one of the outdoor heat exchanger 2 and the indoor heat exchanger 4.
The compressor suction passages 8, 81, and 85 may connect an outlet of the outdoor heat exchanger 2 during the heating operation to an inlet of the compressor 1. The compressor suction flow path 8, 81, 85 may include: an accumulator (accumulator)8 for separating liquid-phase refrigerant and gas-phase refrigerant; a first refrigerant pipe 81 for connecting an outlet of the outdoor heat exchanger 2 during a heating operation and an inlet of the accumulator 8; and a compressor inlet pipe 85 for connecting the outlet of the accumulator 8 and the inlet of the compressor 1.
When the air conditioner is performing a heating operation, the liquid-phase refrigerant and the gas-phase refrigerant can flow from the outdoor heat exchanger 2 to the accumulator 8 via the first refrigerant pipe 81, and the refrigerant flowing to the accumulator 8 can be separated into the liquid-phase refrigerant and the gas-phase refrigerant in the accumulator 8.
The liquid-phase refrigerant separated in the accumulator 8 may be accommodated in a lower side of the inside of the accumulator 8, and the gas-phase refrigerant separated in the accumulator 8 may be positioned in an upper side thereof.
The gas-phase refrigerant separated in the accumulator 8 may flow to the compressor 1 via the compressor inlet pipe 85, while the liquid-phase refrigerant separated in the accumulator 8 may remain inside the accumulator 8.
The second refrigerant pipe 82 can connect the outlet of the indoor heat exchanger 4 during the heating operation and the inlet of the expansion mechanism 3 during the heating operation.
And a third refrigerant pipe 83. The outlet of the expansion mechanism 3 during the heating operation and the inlet of the outdoor heat exchanger 2 during the heating operation may be connected.
The fourth refrigerant pipe 84 may connect the outlet of the compressor 1 and the inlet of the indoor heat exchanger 4 during the heating operation.
The cooling/heating switching valve 7 may be provided in the first refrigerant pipe 81 and the fourth refrigerant pipe 84.
The outdoor heat exchanger 2 may be constructed in a fin-tube type. The outdoor heat exchanger 2 has a plurality of fins arranged in a stacked manner, and the tubes penetrate the fins a plurality of times. A refrigerant flow path for circulating a refrigerant is formed inside the tube.
Referring to the drawings, the outdoor heat exchanger 2 may include: a plurality of unit flow paths formed by dividing the refrigerant flow paths from each other. In the present embodiment, a case where the refrigerant flow path of the outdoor heat exchanger 2 is divided into three unit flow paths will be described. However, the present invention is not limited to this, and may be configured by four or more or two or less unit flow paths. In the present embodiment, the refrigerant flow path of the outdoor heat exchanger 2 is divided into upper, center, and lower portions.
Referring to the drawings, in the outdoor heat exchanger 2, the refrigerant flow paths may be arranged in a plurality of rows along the side. Three columns are formed in the present embodiment, but not limited thereto, and columns other than three columns may be formed, as known to those skilled in the art.
The outdoor heat exchanger 2 may include a first bank 21 connected to a first refrigerant pipe 81 connected to the compressor 1. The outdoor heat exchanger 2 may include a third row 23 connected to a third refrigerant pipe 83 connected to the expansion mechanism 3. The outdoor heat exchanger 2 may include a second bank 22 disposed between the first bank 21 and a third bank 23.
The tubes arranged in the first row 21 are connected to the first refrigerant pipe 81 connected to the compressor 1 on one side thereof, and connected to the tubes arranged in the second row 22 on the other side thereof. The tubes arranged in the second row 22 are connected on one side to the tubes of the first row 21 and on the other side to the tubes of the third row 23. The tubes arranged in the third row 23 are connected at one side to the tubes in the second row 22, and at the other side to a third refrigerant pipe 83 connected to the expansion mechanism 3.
The first refrigerant pipe 81 may be connected to a pipe disposed at an upper portion of the first row 21. In the first bank 21, the refrigerant may flow from the upper portion to the lower portion. The tubes of the second row 22 and the tubes of the first row 21 may communicate at a lower end. In the second column 22, the refrigerant may flow from the lower portion to the upper portion. The tubes of the third row 23 and the tubes of the second row 22 may communicate at the upper end. In the third row 23, the refrigerant may flow from the upper portion to the lower portion. The third refrigerant pipe 83 may be connected to a pipe disposed below the third row 23.
The flow direction of the refrigerant in the first bank 21 may be opposite to the flow direction of the refrigerant in the second bank 22. The flow direction of the refrigerant in the second row 22 may be opposite to the flow direction of the refrigerant in the third row 23. For example, in the case where the refrigerant flow direction of the first bank 21 is downward, the refrigerant flow direction of the second bank 22 may be upward, and the refrigerant flow direction of the third bank 23 may be downward.
At least one temperature sensor may be disposed in the outdoor heat exchanger 2. Referring to fig. 1, may include: an outdoor heat exchanger first temperature sensor 221; and an outdoor heat exchanger second temperature sensor 231. In the present invention, the temperature (T) of the outdoor heat exchanger is controlled by the processorHEX) Is the temperature measured by the outdoor heat exchanger first temperature sensor 221.
The outdoor heat exchanger first temperature sensor 221 may be disposed in the second row 22. The outdoor heat exchanger first temperature sensor 221 may be disposed at a position close to the defroster bypass pipe 86 of the outdoor heat exchanger 2. According to a second embodiment described later, the outdoor heat exchanger first temperature sensor 221 may be disposed at a position close to the common bypass pipe 86c of the outdoor heat exchanger 2. The outdoor heat exchanger first temperature sensor 221 may be disposed at a connection point between the common bypass pipe 86c and the outdoor heat exchanger 2.
The outdoor heat exchanger first temperature sensor 231 may measure the temperature of the refrigerant bypassed from the outdoor heat exchanger 2 to the bypass pipe 86, and may transmit the data to the processor 300.
The outdoor heat exchanger second temperature sensor 231 may be disposed at the third row 23. The outdoor heat exchanger second temperature sensor 231 may be disposed at a position close to the third refrigerant pipe 83 of the outdoor heat exchanger 2. The outdoor heat exchanger second temperature sensor 231 may be disposed at a connection point between the third refrigerant pipe 83 and the outdoor heat exchanger 2.
The outdoor heat exchanger second temperature sensor 231 may measure the temperature of the refrigerant discharged from the outdoor heat exchanger 2 toward the third refrigerant pipe 83, and may transmit the data to the processor 300.
Although not shown, when the refrigerant flow path of the outdoor heat exchanger 2 is divided into an upper portion, a center portion, and a lower portion as shown in fig. 1, the first temperature sensor 221 and the second temperature sensor 231 may be disposed at positions corresponding to the refrigerant flow path positioned at the center and may be disposed at positions corresponding to the refrigerant flow path positioned at the lower portion.
< defrost bypass piping >
The defrosting bypass pipe 86 has one end connected to the outdoor heat exchanger 2 and the other end connected to the compressor inlet pipe 85, and bypasses a part of the refrigerant flowing through the outdoor heat exchanger 2 to the compressor 1.
One end of the defrost bypass pipe 86 is connected to the outdoor heat exchanger 2, and the refrigerant flows through the defrost bypass pipe 86. The defrost bypass pipe 86 may be connected to the tubes of the second row 22 of the outdoor heat exchanger 2. As shown in fig. 1, in the case where the refrigerant flow path of the outdoor heat exchanger 2 is divided into upper/center/lower portions, the defrost bypass pipe 86 may be connected in parallel to the tubes located at the upper portion, the center, and the lower portion, respectively.
The defroster bypass pipe 86 may be connected to the middle of the tubes of the second row 22 of the outdoor heat exchanger 2. The defroster bypass pipe 86 is preferably connected to the center of the tubes of the second row 22, but may be connected as close as possible to the center of the tubes of the second row 22 as shown in fig. 1.
The other end of the defrost bypass pipe 86 is connected to the compressor inlet pipe 85. The defrosting bypass pipe 86 is connected to the compressor inlet pipe 85, and thereby the bypassed refrigerant flows into the compressor 1.
The defrosting bypass pipe 86 bypasses a part of the refrigerant and flows into the compressor 1, and therefore has an effect of preventing the pressure of the refrigerant flowing into the compressor 1 from decreasing below a predetermined limit, and also has an effect of improving defrosting performance by sufficiently raising the temperature of the refrigerant in the compressor 1.
The defroster bypass valve 87 is a device that is disposed in the defroster bypass pipe 86 and opens and closes the defroster bypass pipe 86. The defroster bypass valve 87 can open the defroster bypass pipe 86 during the heating operation and can block the defroster bypass pipe 86 during the cooling operation. The defroster bypass valve 87 may be an on-off valve, and may adjust the amount of refrigerant flowing through the defroster bypass pipe 86.
The processor 300 is a device for controlling the operation of the air conditioner. The processor 300 may be disposed inside the air conditioner.
The processor 300 may control the operation of the compressor 1, may control the opening and closing of the expansion mechanism 3, and may perform control for opening and closing an air discharge port of an air conditioner, changing a discharge angle, or the like. Further, in addition to the control, a control method that can be easily adopted by a person having ordinary skill in the art is also included.
Processor 300 may control defrost bypass valve 87. The processor 300 may open and close the defroster bypass valve 87 disposed in the defroster bypass pipe 86 to bypass the refrigerant to the compressor inlet pipe 85. The processor 300 can open the defrost bypass valve 87 for a predetermined time to bypass the refrigerant to the compressor inlet pipe 85, and can close the defrost bypass valve 87 after the predetermined time has elapsed, thereby preventing the refrigerant from being bypassed.
The predetermined time corresponds to the pressure of the refrigerant flowing into the compressor 1, which can sufficiently maintain the defrosting performance. The processor 300 sets the defrost bypass valve 87 in the open state during the predetermined time, and compensates for the pressure of the refrigerant flowing into the compressor 1 by bypassing the refrigerant. After the predetermined time has elapsed, the processor 300 closes the defrost bypass valve 87, thereby making it possible to prevent the refrigerant from bypassing. The processor 300 may calculate the predetermined time based on the temperature of the outdoor heat exchanger 2.
The processor 300 may open the defrost bypass valve 87 in a case where the temperature of the refrigerant of the outdoor heat exchanger 2 is less than a preset reference temperature, and may close the defrost bypass valve 87 in a case where the temperature of the refrigerant of the outdoor heat exchanger 2 is greater than or equal to the preset reference temperature. The reference temperature has been stored in the processor 300 and can be determined by performing experiments. The reference temperature is the refrigerant temperature of the outdoor heat exchanger 2 corresponding to the pressure of the refrigerant at which sufficient defrosting performance can be ensured even if the refrigerant flowing into the compressor 1 is not bypassed. That is, when the temperature of the refrigerant passing through the outdoor heat exchanger 2 is equal to or higher than the reference temperature, the refrigerant flowing into the compressor 1 has a sufficiently high pressure even if the refrigerant does not bypass the compressor inlet pipe 85, and therefore has a desired defrosting performance.
For example, when the temperature of the refrigerant bypassed from the outdoor heat exchanger 2 reaches 12 degrees celsius at the start of performing the high-speed defrosting operation, the processor 300 may close the defrost bypass valve 87. When the temperature of the refrigerant reaches 12 degrees celsius, the refrigerant flowing into the compressor 1 has a sufficient pressure, and therefore, even if the refrigerant is not bypassed, the defrosting performance can be sufficiently ensured.
< method of operation >
When the air conditioner performs a heating operation, the refrigerant flows as follows. The refrigerant compressed in the compressor 1 moves to the cooling/heating switching valve 7 through the front portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the indoor heat exchanger 4 through the rear portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the indoor heat exchanger 4 moves to the expansion mechanism 3 through the second refrigerant pipe 82. The refrigerant that has moved to the expansion mechanism 3 moves to the outdoor heat exchanger 2 through the third refrigerant pipe 83. The refrigerant that has moved to the outdoor heat exchanger 2 passes through the front portion of the first refrigerant pipe 81 and flows to the cooling/heating switching valve 7. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the accumulator 8 through the rear portion of the first refrigerant pipe 81. The refrigerant that has moved to the accumulator 8 moves to the compressor 1 via the compressor inlet pipe 85. When the air conditioner performs a heating operation, the refrigerant repeats the above-described flow.
On the other hand, when the air conditioner performs a cooling operation, the flow of the refrigerant is as follows. The refrigerant compressed in the compressor 1 moves to the cooling/heating switching valve 7 through the front portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the outdoor heat exchanger 2 through the front portion of the first refrigerant pipe 81. The refrigerant having moved to the outdoor heat exchanger 2 moves to the expansion mechanism 3 through the third refrigerant pipe 83. The refrigerant that has moved to the expansion mechanism 3 moves to the indoor heat exchanger 4 through the second refrigerant pipe 82. The refrigerant that has moved to the indoor heat exchanger 4 moves to the cooling/heating switching valve 7 through the rear portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the accumulator 8 through the rear portion of the first refrigerant pipe 81. The refrigerant that has moved to the accumulator 8 moves to the compressor 1 via the compressor inlet pipe 85. When the air conditioner performs a cooling operation, the refrigerant repeats the flow as described above.
On the other hand, when the air conditioner performs a normal defrosting operation, the flow of the refrigerant is as follows. The refrigerant compressed in the compressor 1 moves to the cooling/heating switching valve 7 through the front portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the outdoor heat exchanger 2 through the front portion of the first refrigerant pipe 81, and removes moisture and ice adhering to the outdoor heat exchanger 2. The refrigerant having moved to the outdoor heat exchanger 2 moves to the expansion mechanism 3 through the third refrigerant pipe 83. The refrigerant that has moved to the expansion mechanism 3 moves to the indoor heat exchanger 4 through the second refrigerant pipe 82. The refrigerant that has moved to the indoor heat exchanger 4 moves to the cooling/heating switching valve 7 through the rear portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the accumulator 8 through the rear portion of the first refrigerant pipe 81. The refrigerant that has moved to the accumulator 8 moves to the compressor 1 via the compressor inlet pipe 85. When the air conditioner performs a normal defrosting operation, the refrigerant repeats the flow as described above.
On the other hand, when the air conditioner performs a general defrosting operation, a high-speed defrosting operation may be partially included. The high speed defrost run time may be controlled by the processor 300. When a general defrosting operation is started, the processor 300 may partially include a high-speed defrosting operation. When the normal defrosting operation is started, the processor 300 may start the high-speed defrosting operation, and if a preset set time elapses, may terminate the high-speed defrosting operation and start the normal defrosting operation.
When the air conditioner performs a high-speed defrosting operation, the flow of the refrigerant is as follows. The refrigerant compressed in the compressor 1 moves to the cooling/heating switching valve 7 through the front portion of the fourth refrigerant pipe 84. The refrigerant that has moved to the cooling/heating switching valve 7 moves to the outdoor heat exchanger 2 through the front portion of the first refrigerant pipe 81. A part of the refrigerant having moved to the outdoor heat exchanger 2 flows to the bypass pipe 86 connected to the second row 22, and the remaining refrigerant passes through the third row 23 and flows to the third refrigerant pipe 83.
A part of the refrigerant flowing through the bypass pipe 86 merges with the remaining refrigerant in the compressor inlet pipe 85 and flows into the compressor 1. As in the case of the normal defrosting operation, the excess refrigerant flowing through the third refrigerant pipe 83 flows into the compressor 1 via the expansion mechanism 3 and the like, and merges with the part of the refrigerant in the compressor inlet pipe 85. When the air conditioner performs a high-speed defrosting operation, the refrigerant repeats the flow as described above.
In the case of the high-speed defrosting operation, a part of the refrigerant is branched while flowing through the outdoor heat exchanger 2 and bypassed to the compressor inlet pipe 85. The pressure of the remaining refrigerant decreases while passing through the expansion mechanism 3, and the pressure loss increases as the remaining refrigerant passes through the other components, so that the pressure of the refrigerant flowing to the compressor 1 further decreases. Therefore, the pressure of the refrigerant becomes very low in the compressor inlet pipe 85, and the defrosting performance cannot be normally exhibited. In this case, the refrigerant is converged with a part of the bypassed refrigerant to compensate the pressure, thereby ensuring the defrosting performance of the air conditioner.
In order to ensure defrosting performance, the diameter of the third refrigerant pipe 83 connected to the outlet end of the outdoor heat exchanger 2 needs to be designed to be sufficiently large, but when the third refrigerant pipe 83 is designed to be large, there is a problem in that cooling capacity is greatly reduced. Therefore, by performing the high-speed defrosting operation before the normal defrosting operation, even if the diameter of the third refrigerant pipe 83 is designed to be sufficiently small, the defrosting performance can be ensured at the initial stage of the defrosting operation, and the cooling performance can be maintained.
In contrast, in the high-speed defrosting operation, the refrigerant does not pass through other components from the viewpoint that the refrigerant flows only in a part of the outdoor heat exchanger 2 and does not flow in the remaining part of the outdoor heat exchanger 2, and therefore, there is a problem that general operating performance is deteriorated. In addition, in the outdoor heat exchanger 2, since a part of the refrigerant does not flow through the tubes of the third row 23 and the tubes of the second row 22, there is a problem that defrosting is not sufficient. Therefore, the processor 300 terminates the high-speed defrosting operation at an appropriate timing and shifts to the general defrosting operation, whereby the general defrosting operation performance can be ensured. The appropriate timing is a timing at which the temperature of the heat exchanger is equal to or higher than the reference temperature and the pressure of the refrigerant in the compressor inlet pipe 85 can normally exhibit the defrosting performance.
< second embodiment >
Fig. 5 is a configuration diagram showing an air conditioner according to a second embodiment of the present invention. Here, the same components as those of the first embodiment are given the same reference numerals, and detailed description thereof is omitted, and only the differences will be described.
Referring to fig. 5, the defrost bypass pipe 86 may be connected to the middle (second row) of the outdoor heat exchanger 2. More specifically, the common bypass pipe 86c of the defrosting bypass pipe 86 may be connected to the middle of the outdoor heat exchanger 2. One end of the common bypass pipe 86c may be branched into at least two pipes, and the branched pipes are named a first bypass pipe 86a and a second bypass pipe 86b, respectively.
The first bypass pipe 86a may be branched from the common bypass pipe 86c and may be connected to the compressor inlet pipe 85. That is, the first bypass pipe 86a is connected to the compressor inlet pipe 85, as in the first embodiment. A first bypass valve 87a may be provided in the first bypass pipe 86 a.
The second bypass pipe 86b branches from the common bypass pipe 86c and is connected to an inlet pipe of the accumulator 8. A part of the refrigerant branched from the common bypass pipe 86c can flow into the inlet pipe of the accumulator 8 through the second bypass pipe 86 b.
A part of the refrigerant passing through the second bypass pipe 86b can flow into the accumulator 8 and be separated into a liquid-phase refrigerant and a gas-phase refrigerant. The gas-phase refrigerant separated in the accumulator 8 flows into the compressor 1 via the compressor inlet pipe 85, and the liquid-phase refrigerant separated in the accumulator 8 may remain in the accumulator 8.
When the air conditioner performs the general defrosting operation, the processor 300 may partially include the high-speed defrosting operation, similar to the control method of the first embodiment.
However, unlike the first embodiment, the processor 300 may selectively open and close the first bypass valve 87a and the second bypass valve 87 b.
In more detail, unlike the first embodiment, in the second embodiment, the second bypass valve 87b may be opened in the case where the temperature of the refrigerant of the outdoor heat exchanger 2 is less than a preset reference temperature, and the second bypass valve 87b may be closed in the case where the temperature of the refrigerant of the outdoor heat exchanger 2 is greater than or equal to the preset reference temperature.
The processor 300 can guide the bypassed refrigerant to the inlet pipe of the accumulator 8 by opening the second bypass valve 87 b. The refrigerant that has bypassed the inlet pipe of the accumulator 8 is mixed with the refrigerant that has passed through the indoor heat exchanger 4, and flows into the accumulator 8. The refrigerant flowing into the accumulator 8 can be separated into liquid-phase refrigerant and gas-phase refrigerant. The gas-phase refrigerant separated in the accumulator 8 may flow into the compressor 1 via the compressor inlet pipe 85, while the liquid-phase refrigerant separated in the accumulator 8 may remain inside the accumulator 8.
As described above, in the air conditioners according to the embodiments of the present invention, the refrigerant branched from the middle of the outdoor heat exchanger 2 is bypassed to the compressor inlet pipe 85, thereby preventing the abnormal pressure drop from occurring in the compressor inlet pipe 85 at the initial stage of the defrosting operation, and thus there is an effect that the defrosting performance can be maintained. Further, since a part of the refrigerant directly bypasses the compressor 1 without circulating through other plural components of the air conditioner, there is an effect that the defrosting performance can be improved at the initial stage of the defrosting operation. Further, by further reducing the pressure loss of the refrigerant flowing through the rear end of the outdoor heat exchanger 2, the diameter of the third refrigerant pipe 83 having a relatively small diameter is designed to be smaller, which also has an effect of improving the cooling performance.
While the preferred embodiments of the present invention have been shown and described, the present invention is not limited to the above-described specific embodiments, and various modifications can be naturally made by those skilled in the art without departing from the gist of the present invention claimed in the claims, and these modifications should not be individually understood based on the technical idea or the prospect of the present invention.

Claims (18)

1. An air conditioner, comprising:
a compressor compressing a refrigerant;
an indoor heat exchanger disposed in a pipe connected to the compressor and configured to exchange heat between the refrigerant and indoor air;
an outdoor heat exchanger disposed in a pipe connected to the compressor and not provided with the indoor heat exchanger, and configured to exchange heat between the refrigerant and outdoor air;
an expansion mechanism that is disposed in a pipe connecting the indoor heat exchanger and the outdoor heat exchanger and expands the refrigerant;
a defrosting bypass pipe having one end connected to an intermediate position of the outdoor heat exchanger and the other end connected to an inlet pipe of the compressor;
a defrosting bypass valve disposed in the defrosting bypass pipe; and
a processor that opens and closes the defrost bypass valve according to a temperature of the refrigerant in the outdoor heat exchanger.
2. The air conditioner according to claim 1,
the outdoor heat exchanger includes:
a first row in which pipes connected to the compressors are arranged;
a third row in which a pipe connected to the expansion mechanism is disposed; and
a second row arranged between the first row and the third row, and in which tubes for connecting the tubes of the first row and the tubes of the third row are arranged;
the defrosting bypass pipe is connected to the pipe disposed in the second row.
3. The air conditioner according to claim 2,
in the outdoor heat exchanger, a flow direction of the refrigerant of the first bank is opposite to a flow direction of the refrigerant of the second bank.
4. The air conditioner according to claim 2,
in the outdoor heat exchanger, the lower ends of the tubes of the second row and the tubes of the first row communicate with each other, and the upper ends of the tubes of the second row and the tubes of the third row communicate with each other.
5. The air conditioner according to claim 1,
the processor opens the defrost bypass valve in a case where the temperature of the refrigerant in the outdoor heat exchanger is less than a preset temperature,
the processor closes the defrost bypass valve in a case where a temperature of the refrigerant in the outdoor heat exchanger is a preset temperature or more.
6. The air conditioner according to claim 1,
further comprising an accumulator disposed between the indoor heat exchanger and the compressor,
the defrosting bypass pipe includes:
a common bypass pipe connected to the outdoor heat exchanger;
a first bypass pipe that branches from the common bypass pipe and is connected to an inlet pipe of the compressor; and
and a second bypass pipe that branches from the common bypass pipe and is connected to an inlet pipe of the accumulator.
7. The air conditioner according to claim 6,
the defrost bypass valve includes:
a first bypass valve disposed in the first bypass pipe; and
and a second bypass valve disposed in the second bypass pipe.
8. The air conditioner according to claim 7,
the processor selectively opens and closes the first bypass valve or the second bypass valve according to a temperature of refrigerant in the outdoor heat exchanger.
9. The air conditioner according to claim 7,
the processor opens the second bypass valve in a case where the temperature of the refrigerant in the outdoor heat exchanger is less than a preset reference temperature,
the processor closes the second bypass valve when the temperature of the refrigerant in the outdoor heat exchanger is equal to or higher than a preset reference temperature.
10. A control method of an air conditioner including a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger, wherein the control method comprises:
a high-speed defrosting operation step of opening a defrosting bypass valve disposed in a defrosting bypass pipe, one end of the defrosting bypass pipe being connected to an intermediate position of the outdoor heat exchanger, and the other end of the defrosting bypass pipe being connected to an inlet pipe of the compressor; and
and a normal defrosting operation step of closing the defrost bypass valve when the temperature of the refrigerant in the outdoor heat exchanger is equal to or higher than a reference temperature.
11. The control method of an air conditioner according to claim 10,
the defrosting bypass pipe includes:
a common bypass pipe connected to the outdoor heat exchanger;
a first bypass pipe that branches from the common bypass pipe and is connected to an inlet pipe of the compressor; and
a second bypass pipe branching from the common bypass pipe and connected to an inlet pipe of the accumulator,
the high-speed defrosting step includes: and selectively opening and closing a first bypass valve disposed in the first bypass pipe or a second bypass valve disposed in the second bypass pipe according to the temperature of the outdoor heat exchanger.
12. The control method of an air conditioner according to claim 11,
in the high-speed defrosting step, the defrosting operation is performed,
opening the second bypass valve in a case where the temperature of the refrigerant in the outdoor heat exchanger is less than a preset reference temperature,
and closing the second bypass valve when the temperature of the refrigerant in the outdoor heat exchanger is equal to or higher than a preset reference temperature.
13. An air conditioner, comprising:
a compressor compressing a refrigerant;
an indoor heat exchanger disposed in a pipe connected to the compressor and configured to exchange heat between the refrigerant and indoor air;
an outdoor heat exchanger disposed in a pipe connected to the compressor and not provided with the indoor heat exchanger, and configured to exchange heat between the refrigerant and outdoor air;
an expansion mechanism that is disposed in a pipe connecting the indoor heat exchanger and the outdoor heat exchanger and expands the refrigerant;
a defrosting bypass pipe having one end connected to an intermediate position of the outdoor heat exchanger and the other end connected to an inlet pipe of the compressor; and
and a defrost bypass valve disposed in the defrost bypass pipe.
14. The air conditioner according to claim 13,
the outdoor heat exchanger includes:
a first row in which pipes connected to the compressors are arranged;
a third row in which a pipe connected to the expansion mechanism is disposed; and
a second row arranged between the first row and the third row, and in which tubes for connecting the tubes of the first row and the tubes of the third row are arranged;
the defrosting bypass pipe is connected to the pipe disposed in the second row.
15. The air conditioner according to claim 14,
in the outdoor heat exchanger, a flow direction of the refrigerant of the first bank is opposite to a flow direction of the refrigerant of the second bank.
16. The air conditioner according to claim 14,
in the outdoor heat exchanger, the lower ends of the tubes of the second row and the tubes of the first row communicate with each other, and the upper ends of the tubes of the second row and the tubes of the third row communicate with each other.
17. The air conditioner according to claim 13,
further comprising an accumulator disposed between the indoor heat exchanger and the compressor,
the defrosting bypass pipe includes:
a common bypass pipe connected to the outdoor heat exchanger;
a first bypass pipe that branches from the common bypass pipe and is connected to an inlet pipe of the compressor; and
and a second bypass pipe that branches from the common bypass pipe and is connected to an inlet pipe of the accumulator.
18. The air conditioner according to claim 17,
the defrost bypass valve includes:
a first bypass valve disposed in the first bypass pipe; and
and a second bypass valve disposed in the second bypass pipe.
CN202110190140.XA 2020-02-17 2021-02-18 Air conditioner Pending CN113266965A (en)

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US20210254880A1 (en) 2021-08-19
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JP7460783B2 (en) 2024-04-02
WO2021167337A1 (en) 2021-08-26

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Application publication date: 20210817