CN110260553B - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN110260553B
CN110260553B CN201910498065.6A CN201910498065A CN110260553B CN 110260553 B CN110260553 B CN 110260553B CN 201910498065 A CN201910498065 A CN 201910498065A CN 110260553 B CN110260553 B CN 110260553B
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China
Prior art keywords
pressure
heat exchanger
air conditioner
pressure relief
temperature
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CN201910498065.6A
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Chinese (zh)
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CN110260553A (en
Inventor
赵紫生
刘燕飞
商远杰
刘华瑞
范芮萄
陈桢
陈勇
张睿诚
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN201910498065.6A priority Critical patent/CN110260553B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • 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
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/247—Active noise-suppression
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • 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
    • F25B2600/2525—Pressure relief valves

Abstract

The invention discloses an air conditioner and a control method of the air conditioner, wherein the air conditioner comprises a refrigerant circulating system, a pressure relief pipeline and a pressure relief valve, the refrigerant circulating system comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a throttling device, two ends of the pressure relief pipeline are respectively a high-pressure end and a low-pressure end, the high-pressure end is connected between an exhaust end of the compressor and an air inlet end of the first heat exchanger in a heating mode, and the pressure relief valve is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline. The air conditioner provided by the invention runs stably and has good sound quality.

Description

Air conditioner and control method thereof
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an air conditioner and a control method of the air conditioner.
Background
The air conditioner can adjust and control parameters such as temperature, humidity, flow rate and the like of ambient air in a building or a structure. In the related art, an air conditioner, such as a fixed-frequency air conditioner, judges the indoor thermal comfort by detecting the temperature of an indoor heat exchanger, when the temperature of the indoor heat exchanger is too high, a compressor and an outdoor fan stop operating to reduce the temperature of the indoor heat exchanger, and when the temperature of the indoor heat exchanger is reduced to meet the requirement, the compressor and the fan start operating; however, the mode causes the complete machine of the air conditioner to be started and stopped frequently, the compressor cannot run stably, the starting and stopping noise is high, the energy consumption is high, the use reliability of the compressor and the fan is reduced, and the service life of the compressor and the fan is prolonged.
In addition, when the air conditioner heats, the indoor fan operates in low wind, and if the temperature of the indoor heat exchanger is overhigh, the outdoor fan stops operating and the compressor keeps operating; however, since the operation of the outdoor fan is stopped, the operation pressure of the compressor is often increased, and particularly, when the air conditioner heats, the noise of the compressor is further deteriorated, and the noise is transmitted to the indoor space, which affects the comfort of the user.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an air conditioner which runs stably and has good sound quality.
The invention also provides a control method of the air conditioner.
An air conditioner according to a first aspect of the present invention includes: the refrigerant circulating system comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a throttling device; the two ends of the pressure relief pipeline are respectively a high-pressure end and a low-pressure end, and the high-pressure end is connected between the exhaust end of the compressor and the air inlet end of the first heat exchanger in the heating mode; and the pressure relief valve is arranged on the pressure relief pipeline and is used for controlling the on-off of the pressure relief pipeline.
According to the air conditioner, the overhigh temperature of the first heat exchanger is effectively inhibited when the air conditioner heats, the thermal comfort of a user is ensured, meanwhile, the air conditioner runs stably and reliably, has good sound quality, and avoids high energy consumption caused by frequent starting and stopping.
According to some embodiments of the invention, the high-pressure end is connected between the four-way valve and the first heat exchanger, so that the connection of the high-pressure end is facilitated, and the arrangement of a pressure relief pipeline is facilitated.
According to some embodiments of the invention, the low-voltage end is connected between the throttling device and the second heat exchanger, so that the cooling and heating effects of the air conditioner are ensured.
According to some embodiments of the present invention, the low-pressure end is connected between the four-way valve and the air return end of the compressor, and the first heat exchanger can be prevented from being too high in temperature.
According to some embodiments of the invention, the number of the pressure relief pipelines is multiple, and each pressure relief pipeline is provided with the pressure relief valve, so that the design of the air conditioner is flexible.
According to some embodiments of the invention, a plurality of the pressure relief pipelines are arranged in parallel, so that the arrangement of the plurality of pressure relief pipelines is simplified.
According to some embodiments of the invention, the low pressure end is formed as a closed end, further facilitating the provision of a pressure relief line.
According to some embodiments of the invention, the low-pressure end is arranged in contact with the second heat exchanger, so that the temperature of the first heat exchanger can be rapidly and stably reduced.
According to some embodiments of the invention, the air conditioner comprises a fan assembly, and the low-pressure end extends to the downstream of the fan assembly, so that the temperature of the first heat exchanger can be rapidly and stably reduced.
According to some embodiments of the present invention, the air conditioner is a split air conditioner and includes an indoor unit casing and an outdoor unit casing, the blower assembly includes an outdoor blower disposed in the outdoor unit casing, and the low pressure end extends into the outdoor unit casing and is located downstream of the outdoor blower, so as to further rapidly reduce the temperature and pressure of the refrigerant in the pressure relief pipeline.
According to some embodiments of the invention, the compressor is a fixed frequency compressor.
A control method of an air conditioner according to a second aspect of the present invention, the air conditioner being the air conditioner according to the above first aspect of the present invention, the control method comprising the steps of: detecting the temperature of the first heat exchanger when the air conditioner is in heating operation; and judging whether the detected temperature is greater than a preset temperature, and if so, controlling the pressure relief valve to conduct the pressure relief pipeline.
The control method of the air conditioner has simple logic, ensures the thermal comfort of users, enables the air conditioner to run stably and reliably, avoids high energy consumption caused by frequent start and stop, and achieves the effect of saving energy.
According to some embodiments of the invention, when the detected temperature is judged to be greater than the preset temperature, if not, the pressure relief valve is controlled to cut off the pressure relief pipeline, so that the heating effect of the air conditioner is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of a connection pipe of an air conditioner according to an embodiment of the present invention;
fig. 2 is a partial structural schematic view of the air conditioner shown in fig. 1;
FIG. 3 is another partial schematic view of the air conditioner shown in FIG. 1;
FIG. 4 is a schematic view of yet another partial structure of the air conditioner shown in FIG. 1;
FIG. 5 is a schematic diagram of the connection of the four-way valve shown in FIG. 2;
FIG. 6 is another schematic connection diagram of the four-way valve shown in FIG. 5;
fig. 7 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
FIG. 8 is a schematic view of a connection line of the air conditioner shown in FIG. 7;
fig. 9 is a control flow diagram of an air conditioner according to an embodiment of the present invention.
Reference numerals:
an air conditioner 100;
a refrigerant circulation system 1;
an air return pipe 10 a; an exhaust pipe 10 b; a valve cooling tube 10 c; a low pressure valve connection pipe 10 d; a muffler 10 e;
a compressor 11; a four-way valve 12; a first heat exchanger 13; a second heat exchanger 14; a throttle device 15;
a gas return end 111; an exhaust end 112;
a first port 121; a second port 122; a third port 123; a fourth port 124;
a first end 131 of the first heat exchanger; a second end 132 of the first heat exchanger;
a first end 141 of the second heat exchanger; a second end 142 of the second heat exchanger;
a pressure relief pipeline 2; a three-way pipe 20; a high voltage end 21; a low voltage end 22;
a pressure relief valve 3;
a fan assembly 4; an outdoor side fan 41;
a valve mounting plate 50; a low-pressure valve 51; a high-pressure valve 52;
a chassis 61; a middle partition plate 62;
an indoor unit casing 71; an outdoor unit casing 72.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
An air conditioner 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1, an air conditioner 100 according to an embodiment of the present invention includes a refrigerant circulation system 1, where the refrigerant circulation system 1 includes a compressor 11, a four-way valve 12, a first heat exchanger 13, a second heat exchanger 14, and a throttling device 15.
As shown in fig. 1, 2 and 5, the compressor 11 has a return end 111 and a discharge end 112, the four-way valve 12 has a first port 121, a second port 122, a third port 123 and a fourth port 124, the first port 121 is communicated with one of the second port 122 and the fourth port 124, the third port 123 is communicated with the other of the second port 122 and the fourth port 124, that is, when the first port 121 is communicated with the second port 122, the third port 123 is communicated with the fourth port 124, or when the first port 121 is communicated with the fourth port 124, the third port 123 is communicated with the second port 122.
The exhaust end 112 may be connected to the first port 121 through an exhaust pipe 10b, the return end 111 may be connected to the third port 123 through a return pipe 10a, the second port 122 may be connected to the second end 142 of the second heat exchanger through a valve cooling pipe 10c, the fourth port 124 may be connected to the first end 131 of the first heat exchanger through a low pressure valve connection pipe 10d, and the throttling device 15 is connected between the second end 132 of the first heat exchanger and the first end 141 of the second heat exchanger.
In the heating mode, the first heat exchanger 13 is a condenser, the second heat exchanger 14 is an evaporator, at this time, the first port 121 is communicated with the fourth port 124, the third port 123 is communicated with the second port 122, a refrigerant discharged from the exhaust end 112 of the compressor 11 flows into the first heat exchanger 13 through the four-way valve 12 to exchange heat, the refrigerant after heat exchange flows to the throttling device 15 to be throttled and depressurized, then the refrigerant flows to the second heat exchanger 14 from the throttling device 15 to exchange heat, and the refrigerant after heat exchange flows to the air return end 111 of the compressor 11 through the four-way valve 12 to enter the next cycle.
In a refrigeration mode, the first heat exchanger 13 is an evaporator, the second heat exchanger 14 is a condenser, at this time, the first port 121 is communicated with the second port 122, the third port 123 is communicated with the fourth port 124, a refrigerant discharged from the exhaust end 112 of the compressor 11 flows into the second heat exchanger 14 through the four-way valve 12 to exchange heat, the refrigerant after heat exchange flows to the throttling device 15 to be throttled and depressurized, then the refrigerant flows from the throttling device 15 to the first heat exchanger 13 to exchange heat, and the refrigerant after heat exchange flows to the air return end 111 of the compressor 11 through the four-way valve 12 to enter a next cycle.
Two ends of the pressure relief pipeline 2 are a high-pressure end 21 and a low-pressure end 22, respectively, the high-pressure end 21 is connected to the exhaust end 112 of the compressor 11 and the intake end of the first heat exchanger 13 in the heating mode, and then the high-pressure end 21 is connected between the exhaust end 112 of the compressor 11 and the first end 131 of the first heat exchanger, so that at least a part of the high-temperature and high-pressure refrigerant flowing from the exhaust end 112 of the compressor 11 to the first heat exchanger 13 in the heating mode can flow from the high-pressure end 21 of the pressure relief pipeline 2 to the low-pressure end 22 of the pressure relief pipeline 2, that is, in the heating mode of the air conditioner 100, at least a part of the high-temperature and high-pressure refrigerant flowing from the exhaust end 112 of the compressor 11 can flow from the high-pressure end 21 of the pressure relief pipeline 2 to the low-pressure end 22 of the pressure relief pipeline 2 before flowing to the first heat exchanger 13. It is understood that the inlet end of the first heat exchanger 13 in the heating mode may be the outlet end of the first heat exchanger 13 in the cooling mode.
Wherein, pressure release pipeline 2 is located to relief valve 3, and relief valve 3 is used for controlling the break-make of pressure release pipeline 2, for example, relief valve 3 opens, then pressure release pipeline 2 switches on, and the refrigerant of the high-pressure side 21 of pressure release pipeline 2 can flow to the low-pressure side 22 of pressure release pipeline 2 this moment, and relief valve 3 closes, then pressure release pipeline 2 disconnection (do not switch on promptly), and the refrigerant of the high-pressure side 21 of pressure release pipeline 2 this moment can't flow to the low-pressure side 22 of pressure release pipeline 2.
When the air conditioner 100 is in the heating mode, the first heat exchanger 13 is a condenser, the second heat exchanger 14 is an evaporator, the thermal comfort of a user can be judged by detecting the temperature of the first heat exchanger 13, the pressure release valve 3 can be in a closed state at the moment, and the refrigerant flowing out of the exhaust end 112 of the compressor 11 can all flow to the first heat exchanger 13 for heat exchange, so that the heating effect of the air conditioner 100 is ensured; if the temperature of the first heat exchanger 13 is too high, for example, when the temperature of the first heat exchanger 13 is greater than a preset temperature, at this time, the pressure relief valve 3 may be in an open state, at least a portion of the high-temperature and high-pressure refrigerant flowing out from the exhaust end 112 of the compressor 11 may flow from the high-pressure end 21 of the pressure relief pipeline 2 to the low-pressure end 22 of the pressure relief pipeline 2, so as to guide and relieve at least a portion of the high-temperature and high-pressure refrigerant discharged from the compressor 11 before flowing to the first heat exchanger 13, thereby reducing the amount of the refrigerant discharged from the compressor 11 and flowing to the first heat exchanger 13, reducing the temperature of the first heat exchanger 13, suppressing the temperature of the first heat exchanger 13 from being too high, ensuring thermal comfort of a user, and simultaneously avoiding frequent start and stop of the whole air conditioner 100, resulting in high noise and high energy consumption, so that the air conditioner 100 has good sound quality, and improving use comfort of the user, and meanwhile, the air conditioner 100 is ensured to run stably and be used reliably.
When the air conditioner 100 is in the cooling mode, the first heat exchanger 13 is an evaporator, the second heat exchanger 14 is a condenser, and the pressure release valve 3 can be always closed at this time, so that the cooling effect of the air conditioner 100 is ensured.
The terms "high-pressure end 21" and "low-pressure end 22" do not necessarily mean that the pressure at the high-pressure end 21 is higher than the pressure at the low-pressure end 22, but mean that the relief valve 3 may be opened when the pressure at the high-pressure end 21 is higher than the pressure at the low-pressure end 22.
According to the air conditioner 100 provided by the embodiment of the invention, the pressure relief pipeline 2 is arranged, so that the high-pressure end of the pressure relief pipeline 2 is connected between the exhaust end 112 of the compressor 11 and the air inlet end of the first heat exchanger 13 in the heating mode, and the pressure relief valve 3 is arranged on the pressure relief pipeline 2 to control the on-off of the pressure relief pipeline 2, so that when the air conditioner 100 is in heating operation, in order to inhibit the overhigh temperature of the first heat exchanger 13, at least one part of high-temperature and high-pressure refrigerant discharged from the compressor 11 can be guided and decompressed before flowing to the first heat exchanger 13 by opening the pressure relief valve 3, the temperature of the first heat exchanger 13 is effectively reduced, the thermal comfort of a user is ensured, and meanwhile, the air conditioner is stable and reliable in operation, has good sound quality, and avoids high energy consumption caused by frequent start and stop.
On the premise of ensuring normal refrigeration and heating of the air conditioner 100, the situation that the complete machine of the air conditioner 100 is frequently started and stopped due to overhigh temperature of the first heat exchanger 13 when the air conditioner 100 heats is effectively avoided, so that the air conditioner 100 runs stably and reliably, has good sound quality, and improves the use comfort of users.
It can be understood that the opening degree of the pressure release valve 3 can be adjusted, so that the opening degree of the pressure release valve 3 can be adjusted according to the actual working condition requirement of the air conditioner 100, the amount of the refrigerant flowing through the pressure release valve 3 is adjusted, and the air conditioner 100 is guaranteed to operate stably all the time.
In some embodiments of the present invention, the high pressure side 21 is connected between the four-way valve 12 and the first heat exchanger 13. For example, as shown in fig. 1, 3, 5 and 6, the high pressure end 21 is connected to the low pressure connection pipe 10d, so that in the heating mode of the air conditioner 100, if the temperature of the first heat exchanger 13 is too high, the pressure relief valve 3 can be opened, and after the refrigerant discharged from the compressor 11 passes through the four-way valve 12, at least a portion of the refrigerant can flow to the low pressure end 22 of the pressure relief pipeline 2 to reduce the temperature of the first heat exchanger 13. Therefore, the connection of the high-pressure end 21 is facilitated, and the arrangement of the pressure relief pipeline 2 is facilitated. Wherein, the high pressure end 21 can be connected between the four-way valve 12 and the first heat exchanger 13 through a tee 20, but is not limited thereto.
It is understood that the connection position of the high pressure end 21 on the low pressure valve connection pipe 10d can be specifically set according to actual requirements, for example, the high pressure end 21 can be connected to the end or the middle of the low pressure valve connection pipe 10d, but is not limited thereto.
Furthermore, the high pressure end 21 may also be connected between the discharge end 112 of the compressor 11 and the first port 121, and the high pressure end 21 may be connected to the discharge pipe 10b, for example, the high pressure end 21 may be connected to an end portion or a middle portion of the discharge pipe 10b, and the like.
In some alternative embodiments of the invention, the low pressure side 22 is connected between the throttling device 15 and the second heat exchanger 14. For example, as shown in fig. 1-3 and 5, the low-pressure end 22 is connected between the throttling device 15 and the first end 141 of the second heat exchanger, so that in the heating mode of the air conditioner 100, if the temperature of the first heat exchanger 13 is too high, the pressure relief valve 3 can be opened, after the refrigerant discharged from the compressor 11 passes through the four-way valve 12, at least a part of the refrigerant can flow to the low-pressure end 22 of the pressure relief pipeline 2 and flow to the second heat exchanger 14 through the low-pressure end 22 of the pressure relief pipeline 2 and the refrigerant passing through the throttling device 15 for heat exchange, and at least a part of the high-temperature and high-pressure refrigerant discharged from the compressor 11 can be effectively guided and decompressed before flowing to the first heat exchanger 13, so as to reduce the temperature of the first heat exchanger 13 and ensure the thermal comfort of a user; meanwhile, the refrigerant in the pressure relief pipeline 2 can flow to the refrigerant circulating system 1 again through the low-pressure end 22 to participate in the circulation, so that the refrigerating and heating effects of the air conditioner 100 are further ensured. Wherein the low pressure end 22 may be connected between the throttling device 15 and the second heat exchanger 14 through a tee 20, but is not limited thereto.
In other alternative embodiments of the present invention, the low pressure side 22 is connected between the four-way valve 12 and the return side 111 of the compressor 11. For example, the low pressure end 22 may be connected between the third port 123 and the air return end 111 of the compressor 11, and the low pressure end 22 may be connected to the air return pipe 10a, so that in the heating mode of the air conditioner 100, if the temperature of the first heat exchanger 13 is too high, the relief valve 3 may be opened, and after the refrigerant discharged from the compressor 11 passes through the four-way valve 12, at least a portion of the refrigerant may flow to the low pressure end 22 of the relief pipeline 2 and flow into the compressor 11 sequentially through the low pressure end 22 of the relief pipeline 2 and the air return end 111 of the compressor 11, and the temperature of the first heat exchanger 13 may be also suppressed from being too high.
In some embodiments of the present invention, there are a plurality of pressure relief pipelines 2, each pressure relief pipeline 2 is provided with a pressure relief valve 3, and the high pressure end 21 of each pressure relief pipeline 2 may be connected between the exhaust end 112 of the compressor 11 and the first end 131 of the first heat exchanger. In the heating mode of the air conditioner 100, if the temperature of the first heat exchanger 13 is too high, the at least one pressure relief valve 3 may be opened to reduce the temperature of the first heat exchanger 13. Thus, the air conditioner 100 has good design flexibility.
In the description of the present invention, "a plurality" means two or more. It is understood that when there are a plurality of pressure relief pipelines 2, the connection positions of the low pressure ends 22 of the plurality of pressure relief pipelines 2 may be the same or different, and the connection positions of the high pressure ends 21 of the plurality of pressure relief pipelines 2 may be the same or different.
Specifically, when there are a plurality of pressure relief pipelines 2, the plurality of pressure relief pipelines 2 may be arranged in parallel, and at this time, the connection positions of the high-pressure ends 21 of the plurality of pressure relief pipelines 2 may be the same, and the connection positions of the low-pressure ends 22 of the plurality of pressure relief pipelines 2 may be the same; for example, the high pressure ends 21 of the plurality of pressure relief lines 2 may each be connected between the four-way valve 12 and the first heat exchanger 13, and the low pressure ends 22 of the plurality of pressure relief lines 2 may each be connected between the throttling device 15 and the second heat exchanger 14.
Of course, the plurality of pressure relief pipelines 2 may also be arranged in non-parallel, for example, the high-pressure ends 21 of the plurality of pressure relief pipelines 2 may all be connected between the four-way valve 12 and the first heat exchanger 13, the low-pressure end 22 of at least one of the plurality of pressure relief pipelines 2 may be connected between the throttling device 15 and the second heat exchanger 14, and the low-pressure end 22 of at least one of the plurality of pressure relief pipelines 2 may be connected between the four-way valve 12 and the air return end 111 of the compressor 11; but is not limited thereto.
In still other alternative embodiments of the present invention, as shown in fig. 8, the low pressure end 22 is formed as a closed end, that is, after the refrigerant in the refrigerant circulation system 1 flows into the pressure relief pipeline 2 through the high pressure end 21 of the pressure relief pipeline 2, the refrigerant is stored in the pressure relief pipeline 2 and cannot flow out from the low pressure end 22. From this, low pressure end 22 can need not to connect in refrigerant circulation system 1 for low pressure end 22 can form the free end, and pressure release pipeline 2 can form the bypass branch road of refrigerant circulation system 1 this moment, has further made things convenient for pressure release pipeline 2's setting, has promoted the packaging efficiency of air conditioner 100.
Specifically, the low-pressure end 22 is in contact with the second heat exchanger 14, so that the air conditioner 100 in the heating mode can exchange heat with the second heat exchanger 14 through the refrigerant flowing into the pressure relief pipeline 2, the second heat exchanger 14 is an evaporator, the second heat exchanger 14 can rapidly reduce the temperature and the pressure of the refrigerant in the pressure relief pipeline 2, and the temperature of the first heat exchanger 13 can be rapidly and stably reduced.
Specifically, as shown in fig. 8, the air conditioner 100 includes the fan assembly 4, and the low-pressure end 22 extends to the downstream of the fan assembly 4, so that the air conditioner 100 in the heating mode operates, the fan assembly 4 can perform air cooling on the refrigerant flowing into the pressure relief pipeline 2, the temperature and the pressure of the refrigerant in the pressure relief pipeline 2 are quickly reduced, and the temperature of the first heat exchanger 13 can be quickly and stably reduced.
Alternatively, as shown in fig. 7 and 8, the air conditioner 100 is a split air conditioner, and the air conditioner 100 includes an indoor unit casing 71 and an outdoor unit casing 72, the indoor unit casing 71 may be disposed on the indoor side, the outdoor unit casing 72 may be disposed on the outdoor side, the blower assembly 4 includes an outdoor side blower 41 disposed in the outdoor unit casing 72, the first heat exchanger 13 may be disposed in the indoor unit casing 71, the second heat exchanger 14 may be disposed in the outdoor unit casing 72, the low pressure side 22 extends into the outdoor unit casing 72, and the low pressure side 22 is located downstream of the outdoor side blower 41, so that the outdoor side blower 41 can cool the refrigerant flowing into the pressure relief pipeline 2, and the low pressure side 22 is located downstream of the outdoor side blower 41, so that the low pressure side 22 is closer to the second heat exchanger 14, when the air conditioner is in the heating mode, the second heat exchanger 14 is an evaporator, so as to further rapidly reduce the temperature of the refrigerant in the pressure relief pipeline 2, And (4) pressure.
The pressure relief pipeline 2 may be disposed in the outdoor unit casing 72, so as to facilitate the arrangement of the pressure relief pipeline 2, avoid the complicated assembly caused by the fact that the pressure relief pipeline 2 needs to extend from the indoor side to the outdoor side, and facilitate the assembly of the air conditioner 100.
It is understood that the air conditioner 100 may be other types of air conditioners, not limited to the split type air conditioner.
In some embodiments of the present invention, the compressor 11 is a fixed-frequency compressor, the air conditioner 100 is a fixed-frequency air conditioner 100, and the rotation speed of the compressor 11 is substantially unchanged, so that frequent starting and stopping of the compressor 11 to suppress the over-temperature of the first heat exchanger 13 is not required, thereby ensuring smooth operation of the air conditioner 100 and low energy consumption.
According to the control method of the air conditioner 100 according to the second aspect embodiment of the present invention, the air conditioner 100 is the air conditioner 100 according to the above-described first aspect embodiment of the present invention.
As shown in fig. 9, the control method includes the steps of: detecting the temperature of the first heat exchanger 13 when the air conditioner 100 is in heating operation; and judging whether the detected temperature is higher than the preset temperature or not, and if so, controlling the pressure release valve 3 to conduct the pressure release pipeline 2.
For example, when the air conditioner 100 is in the heating mode, the temperature of the first heat exchanger 13 may be detected by a temperature sensor of the air conditioner 100, if it is determined that the detected temperature of the first heat exchanger 13 is greater than a preset temperature, it is determined that temperature protection of the first heat exchanger 13 is required, thermal comfort of a user is not good, the pressure release valve 3 is controlled to operate so as to turn on the pressure release pipeline 2, at least a portion of the high-temperature and high-pressure refrigerant flowing out of the exhaust end 112 of the compressor 11 may flow from the high-pressure end 21 of the pressure release pipeline 2 to the low-pressure end 22 of the pressure release pipeline 2, so as to guide and release at least a portion of the high-temperature and high-pressure refrigerant discharged from the compressor 11 before flowing to the first heat exchanger 13, thereby reducing the temperature of the first heat exchanger 13, further maintaining the temperature of the first heat exchanger 13 to be relatively stable, and ensuring thermal comfort of the user.
The "temperature of the first heat exchanger 13" may refer to a temperature of a surface of the first heat exchanger 13, or may refer to a temperature of a refrigerant flowing through the first heat exchanger 13, but is not limited thereto. When the relief valve 3 is opened and the refrigerant flows from the high pressure end 21 to the low pressure end 22, the pressure of the high pressure end 21 is greater than that of the low pressure end 22, and the refrigerant can flow spontaneously under the pressure difference without an external driving device.
The control method of the air conditioner 100 according to the embodiment of the invention has simple logic, ensures the thermal comfort of users, enables the air conditioner 100 to operate stably and reliably, avoids high energy consumption caused by frequent start and stop, and achieves the effect of saving energy.
It can be understood that, during the heating operation of the air conditioner 100, the temperature of the first heat exchanger 13 may be detected in real time, or the temperature of the first heat exchanger 13 may be detected in real time after the air conditioner 100 is heated for a certain period of time, or the temperature of the first heat exchanger 13 may be detected at intervals; but is not limited thereto. The preset temperature may range from 50 ℃ to 55 ℃ (inclusive), for example, the preset temperature may be 50 ℃, or 52 ℃, or 55 ℃, so as to ensure the reliability of the electric control of the air conditioner 100.
In some embodiments of the present invention, when determining whether the detected temperature is greater than the preset temperature, if not, the pressure relief valve 3 is controlled to cut off the pressure relief pipeline 2. For example, if it is determined that the detected temperature of the first heat exchanger 13 is less than or equal to the preset temperature, it is determined that the thermal comfort of the user is better, the pressure relief valve 3 is controlled to cut off the pressure relief pipeline 2, and the refrigerant flowing out of the exhaust end 112 of the compressor 11 can all flow to the first heat exchanger 13 for heat exchange, so as to ensure the heating effect of the air conditioner 100.
Further, when the air conditioner 100 is operated for heating, the relief valve 3 may be initially in a closed state, and when the detected temperature of the first heat exchanger 13 is greater than the preset temperature, the relief valve 3 is opened again; when the air conditioner 100 operates in a cooling mode, the pressure release valve 3 can be always closed, and the cooling effect of the air conditioner 100 is guaranteed.
It can be understood that, when the pressure release pipeline 2 is a plurality of, all be equipped with the relief valve 3 on every pressure release pipeline 2, when air conditioner 100 heats the operation, if the temperature of the first heat exchanger 13 that detects is greater than when predetermineeing the temperature, then control at least one relief valve 3 action and make the pressure release pipeline 2 that corresponds switch on, a plurality of relief valves 3 can the synchronization action this moment, also can move asynchronously.
Further, the opening degree of the pressure relief valve 3 is adjustable, and the flow rate of the refrigerant flowing through the pressure relief valve 3 can be adjusted by adjusting the opening degree of the pressure relief valve 3. The opening degree of the pressure relief valve 3 is from a first gear to an Nth gear (N is more than or equal to 2, and N is a positive integer), and the opening degree of the pressure relief valve 3 is gradually increased from the first gear to the Nth gear; when the detected temperature of the first heat exchanger 13 is greater than the preset temperature, the difference value Δ T between the temperature of the first heat exchanger 13 and the preset temperature can be obtained, and the pressure release valve 3 is adjusted to the corresponding gear according to the difference value Δ T.
For example, if the air conditioner 100 has a first temperature range to an nth temperature range, adjusting the relief valve 3 to the corresponding gear according to the difference Δ T includes: when the difference value delta T is in the Mth temperature range, the pressure relief valve 3 is adjusted to the Mth gear, wherein M is more than or equal to 1 and less than or equal to N.
For example, in the example of fig. 9, when the relief valve 3 is adjusted to the first gear, the opening degree of the relief valve 3 is half of the maximum opening degree of the relief valve 3, and at this time, half-flow load relief may be performed, and when the relief valve 3 is adjusted to the second gear, the opening degree of the relief valve 3 is the maximum opening degree, and at this time, full-flow load relief may be performed; when the delta T is in the first temperature interval, the delta T satisfies that the temperature is more than 0 ℃ and less than or equal to 5 ℃, and when the delta T is in the second temperature interval, the delta T satisfies that the temperature is more than 5 ℃. When the air conditioner 100 is operated for heating, if the detected temperature of the first heat exchanger 13 is judged to be greater than the preset temperature, the pressure release valve 3 can be controlled to be opened, when the temperature of the first heat exchanger 13 and the difference between the preset temperatures are within a first temperature range, the pressure release valve 3 is adjusted to a first gear, and when the temperature of the first heat exchanger 13 and the difference between the preset temperatures are within a second temperature range, the pressure release valve 3 is adjusted to a second gear. In addition, N can also be 3, 4, 5, and the like.
Other configurations and operations of the air conditioner 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
The air conditioner 100 and the control method of the air conditioner 100 according to the embodiments of the present invention are described in detail in two specific embodiments with reference to fig. 1 to 9. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.
Example one
In the present embodiment, as shown in fig. 1 to fig. 3, the air conditioner 100 includes a refrigerant circulation system 1, a pressure relief pipeline 2 and a pressure relief valve 3, wherein the refrigerant circulation system 1 includes a compressor 11, a four-way valve 12, a first heat exchanger 13, a second heat exchanger 14 and a throttling device 15. In the heating mode, the first heat exchanger 13 is a condenser, and the second heat exchanger 14 is an evaporator.
The air conditioner 100 is a split type air conditioner, the air conditioner 100 includes an indoor unit casing 71 and an outdoor unit casing 72, the first heat exchanger 13 is disposed in the indoor unit casing 71, and the compressor 11, the four-way valve 12, the second heat exchanger 14, and the throttling device 15 are all disposed in the outdoor unit casing 72. A base plate 61 is arranged in the outdoor unit casing 72, the compressor 11 and the second heat exchanger 14 are both arranged on the base plate 61, a middle partition plate 62 is arranged on the base plate 61 to define an installation cavity, and the compressor 11, the four-way valve 12 and the throttling device 15 are all installed in the installation cavity.
Install valve mounting panel 50 on chassis 61, valve mounting panel 50 is located the length one end of chassis 61, installs low-pressure valve 51 and high-pressure valve 52 on the valve mounting panel 50, and low-pressure valve 51 is connected at the first end 131 of first heat exchanger, and high-pressure valve 52 is connected at the second end 132 of first heat exchanger.
The compressor 11 has a return air port 111 and a discharge air port 112, and the four-way valve 12 has a first port 121, a second port 122, a third port 123 and a fourth port 124, the first port 121 communicating with one of the second port 122 and the fourth port 124, and the third port 123 communicating with the other of the second port 122 and the fourth port 124.
The exhaust end 112 is connected with the first port 121 through an exhaust pipe 10b, the air return end 111 is connected with the third port 123 through an air return pipe 10a, the second port 122 is connected with the second end 142 of the second heat exchanger through a valve cooling pipe 10c, the fourth port 124 is connected with the first end 131 of the first heat exchanger through a low-pressure valve connecting pipe 10d, and the throttling device 15 is connected between the second end 132 of the first heat exchanger and the first end 141 of the second heat exchanger. Wherein, be equipped with muffler 10e on the blast pipe 10b, the both ends of muffler 10e are formed with the variable cross section passageway section to play and fall the effect of making an uproar, amortization.
The pressure relief valve 3 is arranged on the pressure relief pipeline 2, and the pressure relief valve 3 is used for controlling the on-off of the pressure relief pipeline 2; the number of the pressure relief pipeline 2 is one, the pressure relief pipeline 2 is disposed in the outdoor unit casing 72, two ends of the pressure relief pipeline 2 are respectively a high pressure end 21 and a low pressure end 22, the high pressure end 21 is connected between the four-way valve 12 and the first end 131 of the first heat exchanger, the high pressure end 21 is connected to the low pressure connection pipe 10d through the three-way pipe 20, and the low pressure end 22 is connected between the throttling device 15 and the second heat exchanger 14.
The three-way pipe 20 has three pipe orifices, which are respectively a first pipe orifice, a second pipe orifice and a third pipe orifice, the first pipe orifice is connected with the low pressure valve connecting pipe 10d, the second pipe orifice is connected with the high pressure end 21, and the third pipe orifice is connected with the low pressure valve 51 of the air conditioner 100. The other end of the low pressure valve 51 may be connected to the first end 131 of the first heat exchanger.
As shown in fig. 9, when the air conditioner 100 is in heating operation, the temperature of the first heat exchanger 13 is detected by the temperature sensor of the air conditioner 100; whether the temperature of the first heat exchanger 13 that judges to detect is greater than preset temperature, if yes, indoor side no longer needs the heat, then control relief valve 3 makes pressure release pipeline 2 switch on, can directly flow to second heat exchanger 14 in from the partial high temperature high pressure refrigerant that compressor 11 flowed out, if no, then control relief valve 3 and cut off pressure release pipeline 2, and the heat transfer is carried out in flowing to first heat exchanger 13 from the whole high temperature high pressure refrigerant that compressor 11 flowed out.
The higher the temperature of the first heat exchanger 13 is, the larger the opening degree of the pressure release valve 3 is, and the more refrigerants are introduced into the second heat exchanger 14 through the pressure release pipeline 2; the lower the temperature of the first heat exchanger 13, the smaller the opening degree of the relief valve 3, and the less the refrigerant introduced into the second heat exchanger 14 through the relief line 2. Specifically, the aperture of the pressure relief valve 3 is adjustable, the aperture of the pressure relief valve 3 has a first gear and a second gear, when the pressure relief valve 3 is adjusted to the first gear, the aperture of the pressure relief valve 3 is half of the maximum aperture of the pressure relief valve 3, part of high-temperature and high-pressure refrigerant can directly flow into the second heat exchanger 14, and when the pressure relief valve 3 is adjusted to the second gear, the aperture of the pressure relief valve 3 is the maximum aperture. When the difference value delta T between the temperature of the first heat exchanger 13 and the preset temperature is greater than 0 ℃ and less than or equal to 5 ℃, the pressure release valve 3 is adjusted to the first gear, and when the delta T is greater than 5 ℃, the pressure release valve 3 is adjusted to the second gear, so that the heating comfort of the air conditioner 100 is ensured.
Example two
As shown in fig. 7 and 8, the present embodiment has substantially the same structure as the first embodiment, wherein the same reference numerals are used for the same components, except that: the air conditioner 100 includes the fan assembly 4, the fan assembly 4 includes the outdoor side fan 41 disposed in the outdoor unit casing 72, and the low pressure side 22 is located downstream of the outdoor side fan 41, so that the low pressure side 22 may be located between the outdoor side fan 41 and the second heat exchanger 14.
In the description of the present invention, it is to be understood that the terms "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. An air conditioner, comprising:
the refrigerant circulating system comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a throttling device; and
the two ends of the pressure relief pipeline are respectively a high-pressure end and a low-pressure end, and the high-pressure end is connected between the exhaust end of the compressor and the air inlet end of the first heat exchanger in the heating mode; and
the pressure relief valve is arranged on the pressure relief pipeline and used for controlling the on-off of the pressure relief pipeline, the first heat exchanger is a condenser, the second heat exchanger is an evaporator in the heating mode,
wherein the low pressure end is formed as a closed end,
the low pressure end is disposed in contact with the second heat exchanger and/or the low pressure end extends downstream of the fan assembly.
2. The air conditioner of claim 1, wherein the high pressure side is connected between the four-way valve and the first heat exchanger.
3. The air conditioner according to claim 1, wherein the pressure relief pipeline is provided in plurality, and each of the pressure relief pipelines is provided with the pressure relief valve.
4. The air conditioner according to claim 3, wherein a plurality of said pressure relief pipes are arranged in parallel.
5. The air conditioner of claim 1, wherein the air conditioner is a split air conditioner and comprises an indoor unit housing and an outdoor unit housing, the blower assembly comprises an outdoor blower disposed in the outdoor unit housing, and the low pressure side extends into the outdoor unit housing and is located downstream of the outdoor blower when the low pressure side extends downstream of the blower assembly.
6. The air conditioner according to any one of claims 1 to 5, wherein the compressor is a fixed frequency compressor.
7. A control method of an air conditioner according to any one of claims 1 to 6, comprising the steps of:
detecting the temperature of the first heat exchanger when the air conditioner is in heating operation;
and judging whether the detected temperature is greater than a preset temperature, and if so, controlling the pressure relief valve to conduct the pressure relief pipeline.
8. The method of claim 7, wherein when determining whether the detected temperature is greater than a preset temperature, if not, controlling the pressure relief valve to cut off the pressure relief pipeline.
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