CN113932506A - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN113932506A CN113932506A CN202111183575.8A CN202111183575A CN113932506A CN 113932506 A CN113932506 A CN 113932506A CN 202111183575 A CN202111183575 A CN 202111183575A CN 113932506 A CN113932506 A CN 113932506A
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- Prior art keywords
- way valve
- heat exchanger
- port
- interface
- air conditioner
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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
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention relates to an air conditioner, comprising: a compressor having an air suction port and an air discharge port; the outdoor heat exchanger is provided with a first connecting pipe communicated with the upper part or the top of the outdoor heat exchanger and a second connecting pipe communicated with the lower part or the bottom of the outdoor heat exchanger; a first four-way valve which is provided with a first interface communicated with the air suction port, a second interface communicated with the air exhaust port, a third interface communicated with an indoor heat exchanger of the air conditioner and a fourth interface; and a second four-way valve having a first port communicated with the fourth port of the first four-way valve, a second port communicated with the first connection pipe, a third port communicated with the second connection pipe, and a fourth port communicated with an outdoor expansion valve of the air conditioner, wherein the first four-way valve and the second four-way valve are configured to be reversible so that a gas refrigerant discharged from the gas outlet flows into the outdoor heat exchanger from the second connection pipe when the air conditioner enters a defrosting mode. The air conditioner configuration can ensure that water frosted on the upper part of the outdoor heat exchanger is not accumulated on the bottom, so the defrosting time is shortened and the defrosting is thorough.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner.
Background
Air conditioners, including but not limited to integrated air conditioners, split air conditioners, one-drive-many central air conditioners, and fresh air blowers, are common in modern society and are used to adjust indoor temperature so that the indoor temperature more conforms to the physical comfort of people. The basic components of an air conditioner having a heating function generally include a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, and a throttle valve. When the air conditioner heats, the compressor operates to compress the refrigerant into a high-temperature and high-pressure gas refrigerant; the high-temperature and high-pressure gas refrigerant then passes through an indoor heat exchanger (which serves as a condenser at this time) to emit heat into a room to heat indoor air, and the high-temperature and high-pressure gas refrigerant is condensed into a medium-high-temperature liquid refrigerant; the medium-high temperature liquid refrigerant is throttled by a throttle valve (such as an electronic expansion valve or a thermal expansion valve) into low-temperature and low-pressure liquid refrigerant; the low-temperature, low-pressure liquid refrigerant flows into the outdoor heat exchanger (which now serves as an evaporator) and is evaporated therein into a low-temperature, low-pressure gaseous refrigerant by absorbing heat of outdoor ambient air; the low-temperature, low-pressure gaseous refrigerant is then sucked by the compressor and compressed again into a high-temperature, high-pressure gaseous refrigerant, and the air conditioner thus starts a new cycle. When the temperature of the external environment is already low (e.g., close to 0 ℃ or lower than 0 ℃), the temperature of the surface of the outdoor heat exchanger is lowered to be lower than the temperature of the external environment during the evaporation of the refrigerant, and thus the surface of the outdoor heat exchanger is likely to be frosted. The frosting can reduce the air channel between the fins of the outdoor heat exchanger, increase the thermal resistance of the outdoor heat exchanger, cause the performance of the outdoor heat exchanger to be rapidly deteriorated, and even possibly cause the outdoor heat exchanger to be damaged in serious cases. Therefore, it is necessary to defrost the frost layer of the outdoor heat exchanger after the frost layer has reached a certain thickness.
Different defrosting techniques have been developed for existing air conditioners. For example, chinese utility model patent CN213631047U discloses a defrosting system of triple heat pump and a control device thereof. The triple heat pump comprises a compressor, a wind side heat exchanger, a hot water side heat exchanger and an air conditioner side heat exchanger which are connected in parallel, wherein the hot water side heat exchanger is used for providing hot water, and the air conditioner side heat exchanger is used for providing hot air or cold air for adjusting the temperature of a room. Correspondingly, the triple heat supply pump is also provided with a first four-way valve and a second four-way valve which respectively correspond to the hot water side heat exchanger and the air conditioner side heat exchanger. The triple heat pump can implement a heating defrosting mode and a hot water defrosting mode. In the heating defrost mode and the hot water defrost mode, the high-temperature and high-pressure gas refrigerant from the compressor flows through the ports D and E of the first four-way valve and the ports D and C of the second four-way valve in sequence, and then flows into the air-side heat exchanger (which serves as an evaporator in the heating mode and is generally located outdoors) to defrost the frost layer on the outer surface thereof. It should be noted that, in the defrosting system of the triple heat pump, the influence of the high-temperature and high-pressure gas refrigerant entering the air-side heat exchanger from different positions on the defrosting effect is ignored. For example, a high-temperature and high-pressure gas refrigerant enters the wind-side heat exchanger from an upper position and exits from a lower portion thereof to be defrosted. Along with the downward flow of the refrigerant, the temperature of the refrigerant is gradually reduced so that the lower part or the bottom of the wind side heat exchanger cannot be defrosted, and water flowing down after defrosting at the upper part of the wind side heat exchanger is also accumulated at the lower part, so that an ice block accumulation area is gradually formed at the lower part of the wind side heat exchanger, thereby causing the problems that the air conditioner is not defrosted completely or defrosted frequently.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problem in the prior art that the air conditioner is not completely defrosted or is frequently defrosted, the present invention provides an air conditioner, comprising: a compressor having an air suction port and an air discharge port; the outdoor heat exchanger is provided with a first connecting pipe communicated with the upper part or the top of the outdoor heat exchanger and a second connecting pipe communicated with the lower part or the bottom of the outdoor heat exchanger; a first four-way valve having a first port communicated with the suction port, a second port communicated with the exhaust port, a third port communicated with an indoor heat exchanger of the air conditioner, and a fourth port; and a second four-way valve having a first port communicated with the fourth port of the first four-way valve, a second port communicated with the first connection pipe, a third port communicated with the second connection pipe, and a fourth port communicated with an outdoor expansion valve of the air conditioner, wherein the first four-way valve and the second four-way valve are configured to be reversible so that a gas refrigerant discharged from the gas outlet flows into the outdoor heat exchanger from the second connection pipe when the air conditioner enters a defrosting mode.
In order to solve the technical problem of incomplete or frequent defrosting, the air conditioner is provided with a second four-way valve which is specially used for improving the defrosting effect besides a first four-way valve used for switching the cooling mode and the heating mode. The second four-way valve is provided with a first interface communicated with the fourth interface of the first four-way valve, a second interface communicated with the first connecting pipe, a third interface communicated with the second connecting pipe and a fourth interface communicated with an outdoor expansion valve of the air conditioner. Therefore, in the defrosting mode, the second four-way valve arranged between the first connecting pipe communicated with the upper part or the top of the outdoor heat exchanger and the second connecting pipe communicated with the lower part or the bottom of the outdoor heat exchanger can be reversed, so that high-temperature and high-pressure gas refrigerant discharged from the exhaust port of the compressor flows into the outdoor heat exchanger from the bottom of the outdoor heat exchanger after sequentially passing through the first four-way valve and the second four-way valve, the frost on the middle lower part of the outdoor heat exchanger is changed into water and flows away from the chassis, and the high-temperature and high-pressure gas refrigerant is arranged at the bottom of the outdoor heat exchanger, so that the water formed by the frost on the upper part cannot be accumulated at the bottom, and the defrosting time is shortened and is thorough.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, when the air conditioner is operated in a defrosting mode:
a first interface and a third interface of the first four-way valve are communicated with each other, and a second interface and a fourth interface of the first four-way valve are communicated with each other;
a first interface and a third interface of the second four-way valve are communicated with each other, and a second interface and a fourth interface of the second four-way valve are communicated with each other;
the gas refrigerant discharged from the gas outlet sequentially passes through the second and fourth ports of the first four-way valve and the first and third ports of the second four-way valve before flowing into the outdoor heat exchanger from the second connection pipe. In the defrost mode, the outdoor heat exchanger acts as a condenser and the indoor heat exchanger acts as an evaporator. Therefore, the high-temperature and high-pressure gas refrigerant from the compressor enters the first four-way valve through the second port of the first four-way valve and exits the first four-way valve from the fourth port, and then enters the second four-way valve from the first port and exits the second four-way valve from the third port so as to enter the outdoor heat exchanger from the lower part or bottom of the outdoor heat exchanger along the second connecting pipe.
In the above-mentioned preferred technical solution of the defrosting control method for an air conditioner, when the air conditioner is operated in a defrosting mode, the refrigerant in the outdoor heat exchanger flows through the second interface and the fourth interface of the second four-way valve in sequence after flowing out of the outdoor heat exchanger from the first connecting pipe, and then flows to the outdoor expansion valve. The configuration allows the refrigerant to pass through the outdoor expansion valve, then pass through the indoor expansion valve, expand and throttle, and then enter the indoor heat exchanger, so that the indoor heat exchanger has the function of an evaporator.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, when the air conditioner is operated in a heating mode:
a first interface and a fourth interface of the first four-way valve are communicated with each other, and a second interface and a third interface of the first four-way valve are communicated with each other, so that the gas refrigerant discharged from the exhaust port flows to the indoor heat exchanger after sequentially flowing through the second interface and the third interface of the first four-way valve;
and a first interface and a second interface of the second four-way valve are communicated with each other, and a third interface and a fourth interface of the second four-way valve are communicated with each other, so that the liquid refrigerant leaving the indoor heat exchanger flows through the fourth interface and the third interface of the second four-way valve in sequence after being throttled and cooled by the outdoor expansion valve, and then flows into the outdoor heat exchanger from the second connecting pipe. In the heating mode, the indoor heat exchanger functions as a condenser, and the outdoor heat exchanger functions as an evaporator. Therefore, the high-temperature and high-pressure gas refrigerant from the compressor enters the first four-way valve through the second port of the first four-way valve and exits the first four-way valve from the third port, and then enters the indoor heat exchanger along the pipeline to heat the indoor air. The refrigerant condensed into liquid in the indoor heat exchanger is expanded and throttled into low-temperature and low-pressure liquid refrigerant through the outdoor expansion valve, enters the second four-way valve from the fourth interface and leaves the second four-way valve from the third interface so as to enter the outdoor heat exchanger from the lower part or the bottom of the outdoor heat exchanger along the second connecting pipe.
In the above preferred technical solution of the defrosting control method for an air conditioner, when the air conditioner operates in a heating mode, the refrigerant in the outdoor heat exchanger flows through the second port and the first port of the second four-way valve, the fourth port and the first port of the first four-way valve, and then flows to the suction port of the compressor. In the heating mode, the outdoor heat exchanger serves as an evaporator, and thus the gas refrigerant evaporated therein may be sucked into the compressor after passing through the second four-way valve and the first four-way valve in sequence.
In a preferred embodiment of the above-described defrosting control method for an air conditioner, when the air conditioner is operated in a cooling mode:
a first interface and a third interface of the first four-way valve are communicated with each other, and a second interface and a fourth interface of the first four-way valve are communicated with each other;
a first interface and a second interface of the second four-way valve are communicated with each other, and a third interface and a fourth interface of the second four-way valve are communicated with each other;
the gas refrigerant discharged from the gas outlet flows into the outdoor heat exchanger from the first connection pipe after sequentially flowing through the second and fourth ports of the first four-way valve and the first and second ports of the second four-way valve. In the cooling mode, the outdoor heat exchanger functions as a condenser, and the indoor heat exchanger functions as an evaporator. Therefore, the high-temperature and high-pressure gas refrigerant from the compressor enters the first four-way valve through the second port of the first four-way valve and exits the first four-way valve from the fourth port, and then enters the second four-way valve from the first port and exits the second four-way valve from the second port so as to enter the outdoor heat exchanger from the upper part or the top part of the outdoor heat exchanger along the first connecting pipe.
In the above-mentioned preferred technical solution of the defrosting control method for an air conditioner, when the air conditioner is operated in a cooling mode, the refrigerant in the outdoor heat exchanger flows through the third interface and the fourth interface of the second four-way valve in sequence after flowing out of the outdoor heat exchanger from the second connecting pipe, and then flows to the outdoor expansion valve. The configuration allows the refrigerant to pass through the outdoor expansion valve, then pass through the indoor expansion valve, expand and throttle, and then enter the indoor heat exchanger, so that the indoor heat exchanger has the function of an evaporator.
In a preferred technical solution of the above-mentioned defrosting control method for an air conditioner, a defrosting temperature sensor is provided on the outdoor heat exchanger, and the defrosting temperature sensor is disposed on the second connection pipe. In the heating mode, since the low-temperature liquid refrigerant enters the outdoor heat exchanger from the second connecting pipe, the temperature of the second connecting pipe is generally the lowest relative to other parts of the outdoor heat exchanger and is the most prone to frost formation. In this case, the temperature measured by the defrosting temperature sensor on the second connection pipe can be used to accurately judge whether the air conditioner needs defrosting.
In the above preferred technical solution of the defrosting control method for an air conditioner, a middle temperature sensor is provided on the outdoor heat exchanger, and the middle temperature sensor is arranged at a middle position of the outdoor heat exchanger. The temperature measured by the middle temperature sensor can also be used for judging whether the air conditioner needs defrosting.
In a preferable embodiment of the above defrosting control method for an air conditioner, the air conditioner includes a plurality of indoor heat exchangers connected in parallel or a single indoor heat exchanger. The configuration of the air conditioner of the present invention is applicable to both an air conditioning configuration of a single indoor heat exchanger and an air conditioning configuration having a plurality of indoor heat exchangers (may also be referred to as a "multi-split system").
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a system schematic of an embodiment of the air conditioner of the present invention;
FIG. 2 is a schematic diagram of a refrigerant flow direction in a cooling mode according to an embodiment of the air conditioner of the present invention;
FIG. 3 is a schematic flow diagram of a refrigerant in a heating mode according to an embodiment of the air conditioner of the present invention;
fig. 4 is a schematic flow diagram of a refrigerant in a defrosting mode according to an embodiment of the air conditioner of the present invention.
List of reference numerals:
1. an air conditioner; 10. an outdoor unit; 11. a compressor; 111. an exhaust port; 112. an air suction port; 113. an exhaust pipe; 114. an exhaust pressure sensor; 115. an inspiratory pressure sensor; 116. an intake air temperature sensor; 117. an air intake duct; 12. a first four-way valve; 121. a first four-way valve connecting pipe; 122. a gas-liquid separator connecting pipe; 123. a first connecting pipe of the outdoor unit; 13. a second four-way valve; 131. a second four-way second connecting pipe; 132. a first connecting pipe of a second four-way valve; 133. a second connecting pipe of the outdoor unit; 14. an outdoor heat exchanger; 141. a first adapter tube; 142. a second adapter tube; 15. an outdoor expansion valve; 151. a first connecting pipe of the indoor unit; 152. a liquid pipe stop valve; 153. a filter; 16. a gas-liquid separator; 20. an indoor unit; 20a, a first indoor unit; 20b, a second indoor unit; 20c, a third indoor unit; 21. an indoor heat exchanger; 211. a second connecting pipe of the indoor unit; 212. an air pipe stop valve; 22. an indoor expansion valve; 221. an indoor expansion valve connecting pipe; 23. and an indoor unit temperature sensor.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that the air conditioner in the prior art is not completely defrosted or is frequently defrosted, the invention provides an air conditioner 1, which comprises: a compressor 11 having a suction port 112 and a discharge port 111; an outdoor heat exchanger 14 having a first connection pipe 141 communicating with an upper portion or a top of the outdoor heat exchanger 14 and a second connection pipe 142 communicating with a lower portion or a bottom of the outdoor heat exchanger 14; a first four-way valve 12 having a first port communicating with the suction port 112, a second port communicating with the exhaust port 111, a third port communicating with the indoor heat exchanger 21 of the air conditioner 1, and a fourth port; and a second four-way valve 13 having a first port communicated with the fourth port of the first four-way valve 12, a second port communicated with the first connection pipe 141, a third port communicated with the second connection pipe 142, and a fourth port communicated with the outdoor expansion valve 15 of the air conditioner 1, wherein the first four-way valve 12 and the second four-way valve 13 are configured to be reversible such that the gas refrigerant discharged from the gas outlet 111 flows into the outdoor heat exchanger 14 from the second connection pipe 142 when the air conditioner 1 enters the defrost mode.
Fig. 1 is a system diagram of an embodiment of an air conditioner of the present invention. As shown in fig. 1, in one or more embodiments, the air conditioner 1 of the present invention includes an outdoor unit 10 and three indoor units 20 connected in parallel, wherein the indoor units 20 connected in parallel are a first indoor unit 20a, a second indoor unit 20b, and a third indoor unit 20c, respectively, and can be disposed in different rooms. Alternatively, the air conditioner 1 may have one, two, or other suitable number of indoor units. The outdoor unit 10 and each indoor unit 20 are interconnected by refrigerant pipes to form a refrigeration circuit allowing a refrigerant to flow therein. The configuration of each indoor unit 20 may be the same or different according to actual needs. The operation modes of the air conditioner 1 include, but are not limited to, a blowing, cooling, heating, defrosting mode, and a dehumidifying mode.
As shown in fig. 1, each indoor unit 20 includes components such as an indoor heat exchanger 21 and an indoor expansion valve 22. In one or more embodiments, the indoor heat exchanger 21 is a finned coil heat exchanger. Alternatively, the indoor heat exchanger 21 may be a plate heat exchanger or other suitable heat exchanger. The indoor expansion valve 22 may be an electronic expansion valve or a thermostatic expansion valve. The indoor expansion valve 22 is connected to the indoor heat exchanger 21 through an indoor expansion valve connection pipe 221. In one or more embodiments, an indoor unit temperature sensor 23 is provided on the indoor expansion valve connection pipe 221 and at a position close to the indoor heat exchanger 21, for detecting a coil temperature of the indoor heat exchanger 21.
As shown in fig. 1, in one or more embodiments, the outdoor unit 10 includes a compressor 11, a first four-way valve 12, a second four-way valve 13, an outdoor heat exchanger 14, an outdoor expansion valve 15, and a gas-liquid separator 16. In one or more embodiments, compressor 11 is a screw compressor. Alternatively, the compressor 11 may be a centrifugal compressor, a scroll compressor, or other suitable compressor. Further, the compressor 11 may be configured as two or more compressors connected in parallel. The configuration of each compressor 11 may be the same or different, depending on the actual requirements. The compressor 11 has an exhaust port 111 and a suction port 112. The discharge port 111 of the compressor 11 is communicated with the second port of the first four-way valve 12 through a discharge pipe 113. A discharge pressure sensor 114 for detecting a discharge pressure of the compressor 11 is disposed on the discharge pipe 113. The suction port 112 of the compressor 11 is connected to an outlet port (not shown) of the gas-liquid separator 16 through a suction pipe 117. A suction pressure sensor 115 and a suction temperature sensor 116 for detecting a suction pressure and a suction temperature of the compressor 11, respectively, are disposed on the suction pipe 117.
As shown in fig. 1, each of the first four-way valve 12 and the second four-way valve 13 has four ports: a first interface 1#, a second interface 2#, a third interface 3#, and a fourth interface 4 #. As mentioned above, the second port of the first four-way valve 12 is connected to the exhaust pipe 113. In addition, the first port of the first four-way valve 12 is connected to the gas inlet of the gas-liquid separator 16 through a gas-liquid separator connection pipe 122. The third port of the first four-way valve 12 is connected to the air pipe cut-off valve 212 through the outdoor unit first connection pipe 123, and the air pipe cut-off valve 212 is connected to the indoor heat exchanger 21 of each indoor unit through the indoor unit second connection pipe 211, respectively. The fourth port of the first four-way valve 12 is connected to the first port of the second four-way valve 13 via a first four-way valve connection 121. A second port of the second four-way valve 13 is connected to a first connection pipe 141 of the outdoor heat exchanger 14 through a second four-way valve first connection pipe 132. A third port of the second four-way valve 13 is connected to a second connection pipe 142 of the outdoor heat exchanger 14 through a second connection pipe 131 of the second four-way valve. A fourth port of the second four-way valve 13 is connected to the outdoor expansion valve 15 through an outdoor unit second connection pipe 133. The outdoor expansion valve 15 includes, but is not limited to, an electronic expansion valve and a thermal expansion valve. The outdoor unit second connection pipe 133 is further provided with a filter 153 and a liquid pipe shut-off valve 152, respectively. The filter 153 is located between the outdoor expansion valve 15 and the liquid-pipe shutoff valve 152. The liquid pipe cut-off valve 152 is connected to the indoor expansion valve 22 of each indoor unit through the indoor unit first connection pipe 151. The liquid pipe stop valve 152 and the gas pipe stop valve 212 are matched to facilitate operations such as maintenance and refrigerant supplement of the air conditioner 1. Each indoor expansion valve 22 is connected to the corresponding indoor heat exchanger 21 through the corresponding indoor expansion valve connection pipe 221.
With continued reference to fig. 1, the outdoor heat exchanger 14 is a finned coil heat exchanger and thus includes a plurality of fins that fit over hairpin tubes. The outdoor heat exchanger 14 has a first connection pipe 141 communicating with an upper portion or top thereof and a second connection pipe 142 communicating with a lower portion or bottom thereof. When the air conditioner is operated in the heating mode, the second connection pipe 142 corresponds to a liquid collection pipe, and since the low-temperature and low-pressure liquid refrigerant generated after being throttle-expanded by the outdoor expansion valve 15 enters the outdoor heat exchanger 14 from the second connection pipe 142, the temperature at the second connection pipe 142 is generally the lowest as compared to other portions of the outdoor heat exchanger 14. Therefore, a defrost temperature sensor (not shown in the drawings) for detecting a defrost temperature may be disposed on the second connection pipe 142 to obtain a defrost temperature for determining whether the outdoor heat exchanger 14 needs defrosting. In one or more embodiments, a middle temperature sensor is further disposed at a middle position of the outdoor heat exchanger 14 for detecting a middle temperature of the outdoor heat exchanger 13. In the heating mode, the intermediate temperature may also be used to determine whether the outdoor heat exchanger 14 needs to be defrosted, for example, when the intermediate temperature is lower than the above-mentioned defrosting temperature.
Fig. 2 is a schematic view of a refrigerant flow direction in a cooling mode according to an embodiment of the air conditioner of the present invention. When the air conditioner 1 of the present invention operates in the cooling mode, the compressor 11 compresses the low-temperature and low-pressure gas refrigerant sucked through the suction pipe 117 into a high-temperature and high-pressure gas refrigerant, and then the high-temperature and high-pressure gas refrigerant is discharged from the discharge port 111. As shown in fig. 2, the high-temperature and high-pressure gas refrigerant flows into the first four-way valve 12 along the exhaust pipe 113 as indicated by the arrow in the drawing. In a cooling mode, the first port of the first four-way valve 12 is communicated with the third port, and the second port thereof is communicated with the fourth port; meanwhile, the first port of the second four-way valve 13 communicates with the second port, and the third port thereof communicates with the fourth port. Therefore, the high-temperature and high-pressure gas refrigerant entering the first four-way valve 12 exits from the fourth port of the first four-way valve 12 and flows to the second four-way valve 13 along the first four-way valve connection pipe 121 to enter the second four-way valve 13 from the first port thereof. Then, the high-temperature and high-pressure gas refrigerant exits from the second connection port of the second four-way valve 13 and flows along the second four-way valve first connection pipe 132 to the first connection pipe 141 located at the top of the outdoor heat exchanger 14. The high-temperature and high-pressure gas refrigerant is condensed into a medium-temperature and high-pressure liquid refrigerant by releasing heat to the ambient environment in the outdoor heat exchanger 14. As shown in fig. 2, the liquid refrigerant of middle temperature and high pressure flows out of the outdoor heat exchanger 14 through the second connection pipe 142 located at the bottom of the outdoor heat exchanger 14. Then, the medium-temperature and high-pressure liquid refrigerant flows to the second four-way valve 13 along the second connection pipe 131 of the second four-way valve. The middle-temperature and high-pressure liquid refrigerant enters the second four-way valve 13 from the third port and exits from the fourth port, and then sequentially flows through the outdoor expansion valve 15, the filter 153, and the liquid pipe stop valve 152 along the outdoor unit second connecting pipe 133, so as to enter the corresponding indoor unit 20. After passing through the liquid pipe shutoff valve 152, the medium-temperature and high-pressure liquid refrigerant flows along the indoor unit first connection pipe 151 to the indoor expansion valve 22 of the corresponding indoor unit. The indoor expansion valve 22 expands and throttles the medium-temperature high-pressure liquid refrigerant into a low-temperature low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows into the corresponding indoor heat exchanger 21 along the indoor expansion valve connection pipe 221. In the indoor heat exchanger 21, the low-temperature and low-pressure liquid refrigerant is evaporated into a low-temperature and low-pressure gas refrigerant by absorbing heat of the indoor air, and the indoor air is also cooled to a predetermined temperature. The low-temperature and low-pressure gas refrigerant leaving the indoor heat exchanger 21 flows along the indoor unit second connection pipe 211 to the gas pipe stop valve 212 to enter the outdoor unit 10. In the outdoor unit 10, the low-temperature and low-pressure gas refrigerant flows through the outdoor unit first connection pipe 123 to the first four-way valve 12. The low-temperature and low-pressure gas refrigerant flows in from the third port of the first four-way valve 12 and flows out from the first port thereof. The low-temperature and low-pressure gas refrigerant leaving the first four-way valve 12 flows into the gas-liquid separator 16 along the gas-liquid separator connection pipe 122. After gas-liquid separation in the gas-liquid separator 16, the gas refrigerant is sucked into the compressor along the suction pipe 117 and compressed, so that a new cycle is performed.
Fig. 3 is a schematic flow direction diagram of a refrigerant in a heating mode according to an embodiment of the air conditioner of the present invention. When the air conditioner 1 of the present invention operates in the heating mode, the compressor 11 compresses the low-temperature and low-pressure gas refrigerant sucked through the suction pipe 117 into a high-temperature and high-pressure gas refrigerant, and then the high-temperature and high-pressure gas refrigerant is discharged from the discharge port 111. As shown in fig. 3, the high-temperature and high-pressure gas refrigerant flows into the first four-way valve 12 along the exhaust pipe 113 as indicated by the arrow in the figure. In the heating mode, the first port of the first four-way valve 12 is communicated with the fourth port, and the second port thereof is communicated with the third port; meanwhile, the first port of the second four-way valve 13 communicates with the second port, and the third port thereof communicates with the fourth port. Therefore, the high-temperature and high-pressure gas refrigerant entering the first four-way valve 12 exits from the third port of the first four-way valve 12 and flows along the outdoor unit first connection pipe 123 to the corresponding indoor unit 20 through the gas pipe shutoff valve 212. In the corresponding indoor unit 20, the high-temperature and high-pressure gas refrigerant flows into the corresponding indoor heat exchanger 21 along the indoor unit second connection pipe 211. In the corresponding indoor heat exchanger 21, the high-temperature and high-pressure gas refrigerant releases heat to the indoor air to heat the indoor air, and is condensed into a medium-temperature and high-pressure liquid refrigerant. As shown in fig. 3, after leaving the indoor heat exchanger 21, the medium-temperature and high-pressure liquid refrigerant flows along the indoor expansion valve connection pipe 221 to the indoor expansion valve 22, and then flows along the indoor unit first connection pipe 151 to the liquid pipe stop valve 152 to enter the outdoor unit 10. In the outdoor unit 10, the medium-temperature and high-pressure liquid refrigerant passes through the filter 153 along the outdoor unit second connection pipe 133, and then passes through the outdoor expansion valve 15 to be throttled and expanded into a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows toward the second four-way valve 13 along the outdoor unit second connection pipe 133, flows into the second four-way valve 13 through the fourth port, and leaves the second four-way valve 13 from the third port. The low-temperature and low-pressure liquid refrigerant leaving the second four-way valve 13 enters the bottom of the outdoor heat exchanger 14 along the second connection pipe 131 and the second connection pipe 142 of the second four-way valve in sequence. In the outdoor heat exchanger 14, the low-temperature low-pressure liquid refrigerant absorbs heat of the ambient air and evaporates into a low-temperature low-pressure gas refrigerant. The low-temperature and low-pressure gas refrigerant flows out of the outdoor heat exchanger 14 through the first connection pipe 141 communicating with the top of the outdoor heat exchanger 14. Then, as shown in fig. 3, the low-temperature and low-pressure gas refrigerant enters from the second port of the second four-way valve 13 and exits from the first port thereof, and then flows into the fourth port of the first four-way valve 12 and flows out from the first port thereof. The low-temperature and low-pressure gas refrigerant leaving the first four-way valve 12 flows into the gas-liquid separator 16 along the gas-liquid separator connection pipe 122. After gas-liquid separation in the gas-liquid separator 16, the gas refrigerant is sucked into the compressor along the suction pipe 117 and compressed, so that a new cycle is performed.
Fig. 4 is a schematic flow diagram of a refrigerant in a defrosting mode according to an embodiment of the air conditioner of the present invention. When the air conditioner 1 of the present invention operates in the defrosting mode, the compressor 11 compresses the low-temperature and low-pressure gas refrigerant sucked through the suction pipe 117 into a high-temperature and high-pressure gas refrigerant, and then the high-temperature and high-pressure gas refrigerant is discharged from the discharge port 111. As shown in fig. 4, the high-temperature and high-pressure gas refrigerant flows into the first four-way valve 12 along the exhaust pipe 113 as indicated by the arrow in the figure. In the defrosting mode, the first port of the first four-way valve 12 is communicated with the third port, and the second port thereof is communicated with the fourth port; meanwhile, the first port of the second four-way valve 13 is communicated with the third port, and the second port thereof is communicated with the fourth port. Therefore, the high-temperature and high-pressure gas refrigerant entering the first four-way valve 12 exits from the fourth port of the first four-way valve 12 and flows to the second four-way valve 13 along the first four-way valve connection pipe 121 to enter the second four-way valve 13 from the first port thereof. Then, the high-temperature and high-pressure gas refrigerant exits from the third connection port of the second four-way valve 13 and flows along the second four-way valve second connection pipe 131 to the second connection pipe 142 located at the bottom of the outdoor heat exchanger 14. The high-temperature and high-pressure gas refrigerant radiates heat outward in the outdoor heat exchanger 14 to dissolve a frost layer on an outer surface of the outdoor heat exchanger 14, and is condensed into a medium-temperature and high-pressure liquid refrigerant. As shown in fig. 4, the intermediate-temperature and high-pressure liquid refrigerant flows out of the outdoor heat exchanger 14 through a first connection pipe 141 located at the top of the outdoor heat exchanger 14. Then, the medium-temperature and high-pressure liquid refrigerant flows along the second four-way valve first connection pipe 132 to the second four-way valve 13. The middle-temperature and high-pressure liquid refrigerant enters the second four-way valve 13 from the second port and exits from the fourth port, and then sequentially flows through the outdoor expansion valve 15, the filter 153, and the liquid pipe stop valve 152 along the outdoor unit second connecting pipe 133, so as to enter the corresponding indoor unit 20. After passing through the liquid pipe shutoff valve 152, the medium-temperature and high-pressure liquid refrigerant flows along the indoor unit first connection pipe 151 to the indoor expansion valve 22 of the corresponding indoor unit. The indoor expansion valve 22 expands and throttles the medium-temperature high-pressure liquid refrigerant into a low-temperature low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows into the corresponding indoor heat exchanger 21 along the indoor expansion valve connection pipe 221. In the indoor heat exchanger 21, the low-temperature and low-pressure liquid refrigerant absorbs heat of the indoor air and is evaporated into a low-temperature and low-pressure gas refrigerant. The low-temperature and low-pressure gas refrigerant leaving the indoor heat exchanger 21 flows along the indoor unit second connection pipe 211 to the gas pipe stop valve 212 to enter the outdoor unit 10. In the outdoor unit 10, the low-temperature and low-pressure gas refrigerant flows through the outdoor unit first connection pipe 123 to the first four-way valve 12. The low-temperature and low-pressure gas refrigerant flows in from the third port of the first four-way valve 12 and flows out from the first port thereof. The low-temperature and low-pressure gas refrigerant leaving the first four-way valve 12 flows into the gas-liquid separator 16 along the gas-liquid separator connection pipe 122. After gas-liquid separation in the gas-liquid separator 16, the gas refrigerant is sucked into the compressor along the suction pipe 117 and compressed, so that a new cycle is performed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. An air conditioner, characterized in that the air conditioner comprises:
a compressor having an air suction port and an air discharge port;
the outdoor heat exchanger is provided with a first connecting pipe communicated with the upper part or the top of the outdoor heat exchanger and a second connecting pipe communicated with the lower part or the bottom of the outdoor heat exchanger;
a first four-way valve having a first port communicated with the air suction port, a second port communicated with the air discharge port, a third port communicated with an indoor heat exchanger of the air conditioner, and a fourth port;
a second four-way valve having a first port communicated with a fourth port of the first four-way valve, a second port communicated with the first connection pipe, a third port communicated with the second connection pipe, and a fourth port communicated with an outdoor expansion valve of the air conditioner,
wherein the first four-way valve and the second four-way valve are configured to be switchable when the air conditioner enters a defrosting mode so that a gas refrigerant discharged from the air outlet flows into the outdoor heat exchanger from the second connection pipe.
2. The air conditioner according to claim 1, wherein when the air conditioner is operated in a defrost mode:
a first interface and a third interface of the first four-way valve are communicated with each other, and a second interface and a fourth interface of the first four-way valve are communicated with each other;
a first interface and a third interface of the second four-way valve are communicated with each other, and a second interface and a fourth interface of the second four-way valve are communicated with each other;
the gas refrigerant discharged from the gas outlet sequentially passes through the second and fourth ports of the first four-way valve and the first and third ports of the second four-way valve before flowing into the outdoor heat exchanger from the second connection pipe.
3. The air conditioner as claimed in claim 2, wherein when the air conditioner is operated in a defrost mode, the refrigerant in the outdoor heat exchanger flows through the second port and the fourth port of the second four-way valve in sequence after flowing out of the outdoor heat exchanger from the first connection pipe, and then flows to the outdoor expansion valve.
4. The air conditioner according to claim 1, wherein when the air conditioner operates in a heating mode:
a first interface and a fourth interface of the first four-way valve are communicated with each other, and a second interface and a third interface of the first four-way valve are communicated with each other, so that the gas refrigerant discharged from the exhaust port flows to the indoor heat exchanger after sequentially flowing through the second interface and the third interface of the first four-way valve;
and a first interface and a second interface of the second four-way valve are communicated with each other, and a third interface and a fourth interface of the second four-way valve are communicated with each other, so that the liquid refrigerant leaving the indoor heat exchanger flows through the fourth interface and the third interface of the second four-way valve in sequence after being throttled and cooled by the outdoor expansion valve, and then flows into the outdoor heat exchanger from the second connecting pipe.
5. The air conditioner as claimed in claim 4, wherein when the air conditioner operates in the heating mode, the refrigerant in the outdoor heat exchanger flows through the second port and the first port of the second four-way valve and the fourth port and the first port of the first four-way valve in sequence after flowing out of the outdoor heat exchanger from the first connection pipe, and then flows to the suction port of the compressor.
6. The air conditioner according to claim 1, wherein when the air conditioner is operated in a cooling mode:
a first interface and a third interface of the first four-way valve are communicated with each other, and a second interface and a fourth interface of the first four-way valve are communicated with each other;
a first interface and a second interface of the second four-way valve are communicated with each other, and a third interface and a fourth interface of the second four-way valve are communicated with each other;
the gas refrigerant discharged from the gas outlet flows into the outdoor heat exchanger from the first connection pipe after sequentially flowing through the second and fourth ports of the first four-way valve and the first and second ports of the second four-way valve.
7. The air conditioner of claim 6, wherein when the air conditioner is operated in a cooling mode, the refrigerant in the outdoor heat exchanger flows through the third port and the fourth port of the second four-way valve in sequence after flowing out of the outdoor heat exchanger from the second connection pipe, and then flows to the outdoor expansion valve.
8. The air conditioner according to claim 1, wherein a defrost temperature sensor is provided on the outdoor heat exchanger, the defrost temperature sensor being disposed on the second connection pipe.
9. The air conditioner according to claim 8, wherein a middle temperature sensor is provided on the outdoor heat exchanger, the middle temperature sensor being disposed at a middle position of the outdoor heat exchanger.
10. The air conditioner according to claim 1, wherein the air conditioner comprises a plurality of the indoor heat exchangers in parallel or a single indoor heat exchanger.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183575.8A CN113932506A (en) | 2021-10-11 | 2021-10-11 | Air conditioner |
| PCT/CN2022/091416 WO2023060882A1 (en) | 2021-10-11 | 2022-05-07 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183575.8A CN113932506A (en) | 2021-10-11 | 2021-10-11 | Air conditioner |
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| CN113932506A true CN113932506A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111183575.8A Pending CN113932506A (en) | 2021-10-11 | 2021-10-11 | Air conditioner |
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| CN (1) | CN113932506A (en) |
| WO (1) | WO2023060882A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023060882A1 (en) * | 2021-10-11 | 2023-04-20 | 青岛海尔空调器有限总公司 | Air conditioner |
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| CN113932506A (en) * | 2021-10-11 | 2022-01-14 | 青岛海尔空调器有限总公司 | Air conditioner |
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| CN102003842A (en) * | 2010-11-04 | 2011-04-06 | 三花丹佛斯（杭州）微通道换热器有限公司 | Evaporator and refrigeration system with same |
| CN104990321A (en) * | 2015-06-30 | 2015-10-21 | 广东美的制冷设备有限公司 | Air conditioner and defrosting method thereof |
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| WO2023060882A1 (en) | 2023-04-20 |
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Application publication date: 20220114 |