CN111664541A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN111664541A CN111664541A CN202010568353.7A CN202010568353A CN111664541A CN 111664541 A CN111664541 A CN 111664541A CN 202010568353 A CN202010568353 A CN 202010568353A CN 111664541 A CN111664541 A CN 111664541A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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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
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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
- F24F11/70—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
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the invention provides an air conditioner and a control method thereof, and relates to the technical field of air conditioners. The air conditioner comprises a gas-liquid separator, a compressor and a bypass heat exchange branch. The bypass heat exchange branch is selectively conducted to heat exchange coils which are arranged outside the compressor and can exchange heat with the compressor, so that the heat exchange coils exchanging heat with the compressor heat the refrigerant flowing through the bypass heat exchange branch. The air conditioner and the control method thereof heat the flowing refrigerant through the heat exchange coil pipe with the bypass heat exchange branch, so that the temperature of the refrigerant is increased, the return air temperature of the compressor is increased, the exhaust temperature of the compressor is further increased, and the effect of improving the indoor heating effect is achieved. In addition, the surface temperature of the compressor is reduced through the heat exchange coil, and the reliability of the compressor is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
When the air conditioner is in heating operation in winter, heat is absorbed by outdoor air, and the outdoor air is compressed by the compressor and then flows through the indoor side to maintain the indoor temperature. However, the conventional air conditioner has a poor heating effect in winter.
Disclosure of Invention
The invention solves the problem that the air conditioner has poor heating effect when in low-temperature heating operation.
In order to solve the above problems, embodiments of the present invention provide an air conditioner and a control method thereof, so as to improve an indoor heating effect when the air conditioner is operated at a low temperature.
In a first aspect, an embodiment of the present invention provides an air conditioner, including a gas-liquid separator, a compressor, and a bypass heat exchange branch. The bypass heat exchange branch is provided with a heat exchange coil on the bypass heat exchange branch, the heat exchange coil is wound outside the compressor and can exchange heat with the compressor, and the bypass heat exchange branch is selectively conducted so that the heat exchange coil exchanging heat with the compressor heats a refrigerant flowing through the bypass heat exchange branch, and the temperature of returned gas of the compressor is increased.
The air conditioner provided by the embodiment of the invention realizes heat exchange with the compressor by arranging the selectively conducted bypass heat exchange branch and winding the heat exchange coil outside the compressor. Thus, when the air conditioner is in heating operation in a low-temperature environment, the bypass heat exchange branch is conducted, part of low-temperature refrigerant separated by the gas-liquid separator flows through the bypass heat exchange branch from the first position, heat exchange with the compressor is realized through the heat exchange coil, the heat exchange coil heats the flowing refrigerant, the temperature of the refrigerant is increased, the refrigerant heated by the heat exchange coil is mixed with the refrigerant in the connecting pipeline through the second position and flows back to the compressor through the air return port together, the air return temperature of the compressor is increased, the exhaust temperature of the compressor is increased, and the effect of improving the indoor heating effect is achieved. In addition, because the heat exchange coil exchanges heat with the compressor, the heat generated by the compressor can be effectively utilized, the surface temperature of the compressor is reduced through the heat exchange, and the reliability of the compressor is improved.
In an alternative embodiment, the heat exchange coil is wound around the outside of the compressor at least below the middle thereof.
In an optional embodiment, the air conditioner further includes a controller and a bypass solenoid valve, and the bypass solenoid valve is disposed on the bypass heat exchange branch and electrically connected to the controller.
The controller is used for controlling the bypass electromagnetic valve to be opened to enable the bypass heat exchange branch to be conducted if the return air temperature of the compressor is less than or equal to a first preset return air temperature and the exhaust air temperature of the compressor is less than or equal to a first preset exhaust air temperature when the air conditioner is in heating operation.
In an optional embodiment, the controller is further configured to control the bypass electromagnetic valve to close if the return air temperature is greater than or equal to a second preset return air temperature or the exhaust air temperature is greater than or equal to a second preset exhaust air temperature when the air conditioner is in heating operation, so that the bypass heat exchange branch is cut off, where the second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust air temperature is greater than the first preset exhaust air temperature.
In an optional embodiment, the bypass heat exchange branch comprises a first connecting branch and a second connecting branch, one end of the first connecting branch is connected to the first position, the other end of the first connecting branch is connected to one end of the heat exchange coil, the other end of the heat exchange coil is connected to the second position through the second connecting branch, and the bypass solenoid valve is disposed on the first connecting branch.
In an alternative embodiment, the first location is closer to the gas-liquid separator than the second location.
In a second aspect, an embodiment of the present invention provides an air conditioner control method, which is applied to an air conditioner, where the air conditioner includes a gas-liquid separator, a compressor, and a bypass heat exchange branch, one end of the bypass heat exchange branch is connected to a first position on a connection pipeline between the gas-liquid separator and an air return port of the compressor, and the other end of the bypass heat exchange branch is connected to a second position on the connection pipeline, and a heat exchange coil is disposed on the bypass heat exchange branch, and the heat exchange coil is wound outside the compressor and can exchange heat with the compressor; the air conditioner control method includes:
acquiring the return air temperature and the exhaust air temperature of the compressor when the air conditioner operates in heating;
judging whether the return air temperature is less than or equal to a first preset return air temperature and the exhaust air temperature is less than or equal to a first preset exhaust air temperature;
if the return air temperature is less than or equal to the first preset return air temperature and the exhaust temperature is less than or equal to the first preset exhaust temperature, the bypass heat exchange branch is controlled to be conducted, so that the heat exchange coil exchanging heat with the compressor heats the refrigerant flowing through the bypass heat exchange branch, and the return air temperature is increased.
According to the air conditioner control method provided by the embodiment of the invention, when the air conditioner is in heating operation, when the return air temperature is less than or equal to the first preset return air temperature and the exhaust air temperature is less than or equal to the first preset exhaust air temperature, the return air temperature can be considered to be lower, the heating effect is influenced, the adjustment can be carried out, and the exhaust air temperature is lower than the temperature in normal operation, the proper adjustment can be carried out, the temperature can be improved, the system stability cannot be influenced.
In an optional embodiment, after the step of controlling the conduction of the bypass heat exchange branch, the method further includes:
judging whether the return air temperature is greater than or equal to a second preset return air temperature or whether the exhaust temperature is greater than or equal to a second preset exhaust temperature, wherein the second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust temperature is greater than the first preset exhaust temperature;
if the return air temperature is greater than or equal to the second preset return air temperature or the exhaust temperature is greater than or equal to the second preset exhaust temperature, controlling the bypass heat exchange branch to be cut off;
and if the return air temperature is not higher than or equal to the second preset return air temperature or the exhaust temperature is higher than or equal to the second preset exhaust temperature, continuing to execute the step of controlling the conduction of the bypass heat exchange branch.
In an optional embodiment, the second preset return air temperature is 5-7 ℃, and the second preset exhaust air temperature is 75-80 ℃.
In an optional embodiment, the first preset return air temperature is-3 to 0 ℃, and the first preset exhaust air temperature is 65 to 70 ℃.
Drawings
Fig. 1 is a schematic system structure diagram of an air conditioner according to an embodiment of the present invention, in which arrows indicate a flow direction of a refrigerant when the air conditioner is in a heating operation;
fig. 2 is a schematic view of a partial structure between a gas-liquid separator and a compressor of the air conditioner in fig. 1, wherein arrows indicate the flow direction of a refrigerant when the air conditioner is in heating operation;
fig. 3 is a schematic view of a connection structure of a controller of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating an air conditioner control method according to an embodiment of the present invention.
Description of reference numerals:
10-an air conditioner; 110-a gas-liquid separator; 120-a compressor; 121-return air port; 130-connecting lines; 131-a first position; 132-a second position; 140-four-way valve; 150-indoor heat exchanger; 160-an inner fan; 170-a throttling assembly; 180-a filter; 190-outdoor heat exchanger; 101-an outer fan; 200-a bypass heat exchange branch; 210-a heat exchange coil; 220-first connecting branch; 230-a second connecting branch; 310-return air sensor; 320-an exhaust gas sensor; 400-a controller; 500-bypass solenoid valve.
Detailed Description
When the air conditioner is in heating operation in winter, heat is absorbed by outdoor air, and the outdoor air is compressed by the compressor and then flows through the indoor side to maintain the indoor temperature. However, the conventional air conditioner has a poor heating effect in winter. In the research of the designer, the outdoor environment temperature in winter is lower (for example, the outdoor environment temperature in winter in north is lower than 0 ℃), the difference between the temperature of the refrigerant flowing through the outdoor unit and the environment temperature is not large, the heat exchange effect is poor, the direct expression is that the return air temperature of the compressor is lower (the return air temperature can be expressed by TH, and the return air temperature is lower by 10-0 ℃), the exhaust temperature of the compressor is further reduced (the exhaust air temperature can be expressed by TP, the exhaust air temperature is lower by 60-65 ℃, and is lower than the exhaust air temperature in normal heating by 75-80 ℃), and the temperature of the refrigerant flowing through the indoor unit is lower, so that the heating effect of the refrigerant is influenced. Therefore, embodiments of the present invention provide an air conditioner and a control method thereof, which achieve the effect of improving indoor heating by increasing the return air temperature of a compressor and further increasing the exhaust air temperature of the compressor.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and 2, an embodiment of the present invention provides an air conditioner 10 for improving indoor heating effect during low-temperature heating. The air conditioner 10 includes a gas-liquid separator 110, a compressor 120, a connecting line 130, a four-way valve 140, an indoor heat exchanger 150, an inner fan 160, a throttling assembly 170, a filter 180, an outdoor heat exchanger 190, an outer fan 101, and a bypass heat exchange branch 200. The compressor 120 is connected to one end of an indoor heat exchanger 150 through a four-way valve 140. The inner fan 160 is used for blowing the air into the room after exchanging heat through the indoor heat exchanger 150. The other end of the indoor heat exchanger 150 is connected to the throttle assembly 170, and the throttle assembly 170 is connected to the filter 180. The filter 180 is connected to one end of the outdoor heat exchanger 190, and the external fan 101 is used for blowing air to the outside after exchanging heat with the outdoor heat exchanger 190. The other end of the outdoor heat exchanger 190 is connected to a four-way valve 140, and the four-way valve 140 is connected to the gas-liquid separator 110. The gas-liquid separator 110 is connected to a return port 121 of the compressor 120 via a connecting line 130. Further, the bypass heat exchange branch 200 has one end connected to a first position 131 on the connection line 130 between the gas-liquid separator 110 and the return port 121 of the compressor 120, and the other end connected to a second position 132 on the connection line 130.
When the air conditioner 10 is operated for heating, the heating cycle is as follows: the compressor 120 compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant enters the indoor heat exchanger 150 through the four-way valve 140, and the gaseous refrigerant is a normal-temperature and high-pressure liquid refrigerant after heat dissipation, and at this time, the internal fan 160 blows hot air into the room. The liquid refrigerant at normal temperature and high pressure enters the outdoor heat exchanger 190 through the throttling assembly 170 and the filter 180 to form a low-temperature gaseous refrigerant, and the cold air is blown out of the outdoor by the external fan 101. The low-temperature gaseous refrigerant enters the gas-liquid separator 110 through the four-way valve 140. If the bypass heat exchange branch 200 is in a cut-off state, the low-temperature refrigerant separated by the gas-liquid separator 110 flows through the connection pipe 130 and returns to the compressor 120 through the return port 121, thereby completing the heating cycle.
However, the outdoor ambient temperature is relatively low in winter, the temperature of the refrigerant flowing through the outdoor heat exchanger 190 is not much different from the ambient temperature, the heat exchange effect is poor, the return air temperature of the compressor 120 is relatively low, and the exhaust air temperature is relatively low, so that the heating effect is affected. In this embodiment, the problem of poor heating effect can be improved by providing the bypass heat exchange branch 200.
In this embodiment, the bypass heat exchange branch 200 is provided with a heat exchange coil 210. Wherein, the heat exchange coil 210 is wound outside the compressor 120 and can exchange heat with the compressor 120. The bypass heat exchanging branch 200 is selectively conducted, so that the heat exchanging coil 210 exchanging heat with the compressor 120 heats the refrigerant flowing through the bypass heat exchanging branch 200, thereby increasing the return air temperature of the compressor 120. It should be appreciated that the heat exchanging coil 210 absorbs heat generated by the compressor 120, thereby heating the refrigerant flowing therethrough.
It should be noted that, when the air conditioner 10 is operated in a low-temperature environment for heating, referring to the heating cycle, the return air temperature of the compressor 120 is lower, and when the exhaust air temperature is lower, the bypass heat exchange branch 200 may be controlled to be conducted to increase the return air temperature, so as to increase the exhaust air temperature. Because the bypass heat exchange branch 200 is conducted, part of the low-temperature refrigerant separated by the gas-liquid separator 110 flows through the bypass heat exchange branch 200 from the first position 131, and heat exchange with the compressor 120 is realized through the heat exchange coil 210, so that the heat exchange coil 210 heats the flowing refrigerant, the temperature of the refrigerant is increased, the refrigerant heated by the heat exchange coil 210 is mixed with the refrigerant in the connecting pipeline 130 through the second position 132, and flows back to the compressor 120 through the air return port 121 together, the return air temperature of the compressor 120 is increased, the exhaust temperature of the compressor 120 is increased, and the effect of improving the indoor heating effect is achieved. In addition, since the heat exchange coil 210 exchanges heat with the compressor 120, heat generated by the compressor 120 can be effectively utilized, and the surface temperature of the compressor 120 is reduced by the heat exchange, thereby improving the reliability of the compressor 120.
In addition, it should be noted that the heat exchange coil 210 exchanges heat with the compressor 120 without an additional heat exchange device, so that the structure of the air conditioner 10 itself can be directly utilized, the structure is simplified, and the cost is saved; and the heat exchange coil 210 does not need to exchange heat with the heat exchangers inside and outside the air conditioner 10, so as to prevent the heating effect of the air conditioner 10 from being reduced due to the adverse effect on the heat exchangers inside and outside the air conditioner 10.
Optionally, heat exchanging coil 210 is wrapped around at least a portion of compressor 120 below the middle thereof. That is, the heat exchanging coil 210 is wound at least outside a portion below the middle of the compressor 120, or in other words, the heat exchanging coil 210 may be wound outside the middle, lower, or middle-lower portion of the compressor 120. Because the heat generated by the part below the middle part of the compressor 120 is more, the heat exchange coil 210 is wound around the part below the middle part of the compressor 120, so that the heat exchange with the compressor 120 can be fully realized, the heat generated by the compressor 120 can be absorbed more, the heat exchange effect is improved, the surface temperature of the compressor 120 can be effectively reduced, and the reliability of the compressor 120 is improved.
In this embodiment, the bypass heat exchanging branch 200 includes a first connecting branch 220 and a second connecting branch 230, one end of the first connecting branch 220 is connected to the first position 131, the other end of the first connecting branch is connected to one end of the heat exchanging coil 210, and the other end of the heat exchanging coil 210 is connected to the second position 132 through the second connecting branch 230.
The first position 131 is a portion of the connecting pipe 130 connected to one end of the bypass heat exchanging branch 200, the second position 132 is a portion of the connecting pipe 130 connected to the other end of the bypass heat exchanging branch 200, and the second position 132 is located before the air return opening 121. Optionally, the first location 131 is closer to the gas-liquid separator 110 than the second location 132. That is, from the gas-liquid separator 110 to the return port 121 of the compressor 120, the first position 131 precedes the second position 132. Thus, when the bypass heat exchange branch 200 is turned on, the refrigerant separated by the gas-liquid separator 110 is split at the first position 131, a part of the refrigerant continues to flow from the connecting pipeline 130 to the return air port 121, another part of the refrigerant enters the bypass heat exchange branch 200 for heat exchange, and the refrigerant after heat exchange is mixed with the refrigerant in the connecting pipeline 130. Of course, in some embodiments of the invention, it may also be that second location 132 is closer to gas-liquid separator 110 than first location 131.
In this embodiment, the air conditioner 10 further includes a return air sensor 310 and an exhaust air sensor 320. The return air sensor 310 is disposed at the return air port 121 of the compressor 120, and is used for detecting the return air temperature of the compressor 120. The discharge sensor 320 is disposed at a discharge port of the compressor 120, and is used for detecting a discharge temperature of the compressor 120.
Referring to fig. 2 and 3, in this embodiment, the air conditioner 10 may further include a controller 400 and a bypass solenoid valve 500. The bypass solenoid valve 500 is disposed on the bypass heat exchange branch 200 and electrically connected to the controller 400. The controller 400 is electrically connected to the return air sensor 310 and is configured to receive the return air temperature detected by the return air sensor 310. The controller 400 is electrically connected to the exhaust gas sensor 320 and is configured to receive the exhaust gas temperature detected by the exhaust gas sensor 320. The controller 400 is further configured to control the bypass solenoid valve 500 to open to achieve conduction of the bypass heat exchange branch 200 according to the return air temperature and the exhaust air temperature, or control the bypass solenoid valve 500 to close to achieve cutoff of the bypass heat exchange branch 200. In this embodiment, the bypass solenoid valve 500 is disposed on the first connecting branch 220. Therefore, the on-off of the bypass heat exchange branch 200 is more conveniently controlled, and the heat exchange coil 210 does not exchange heat with the compressor 120 when the bypass heat exchange branch 200 is not on, so that the heat exchange control of the heat exchange coil 210 is more accurate. Of course, in some embodiments of the present invention, the bypass solenoid valve 500 may be disposed on the second connecting branch 230.
The controller 400 may be an integrated circuit chip having signal processing capabilities. The controller 400 may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller 400 may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present invention.
In one possible embodiment, the air conditioner 10 may further include a memory to store program instructions executable by the controller 400. The Memory may be a stand-alone external Memory, including but not limited to Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller 400, for example, the memory may be integrated with the controller 400 on the same chip.
The controller 400 is configured to control the bypass electromagnetic valve 500 to be opened to enable the bypass heat exchange branch 200 to be conducted when the air conditioner 10 is in a heating operation, if the return air temperature of the compressor 120 is less than or equal to a first preset return air temperature and the exhaust air temperature of the compressor 120 is less than or equal to a first preset exhaust air temperature.
It should be noted that, when the air conditioner 10 is operating in heating mode, when the return air temperature is less than or equal to the first preset return air temperature and the exhaust air temperature is less than or equal to the first preset exhaust air temperature, it may be considered that the return air temperature is low, which affects the heating effect, and may be adjusted, and the exhaust air temperature is lower than the temperature in normal operation, which may be adjusted appropriately, so that the increase of the temperature does not affect the system stability. At this time, the controller 400 controls the bypass solenoid valve 500 to be opened, the bypass heat exchange branch 200 is conducted, so that the heat exchange coil 210 exchanging heat with the compressor 120 heats the refrigerant flowing through the bypass heat exchange branch 200 to increase the return air temperature, thereby increasing the exhaust temperature and improving the indoor heating effect, and meanwhile, the low-temperature refrigerant absorbs heat from the compressor 120 through the heat exchange coil 210, so that the surface temperature of the compressor 120 can be effectively reduced, and the operation stability of the compressor 120 is improved. That is, when the adjustment operation determination is performed, if the return air temperature determination and the exhaust air temperature determination both satisfy the preset condition, the adjustment operation is performed, and the controller 400 controls the bypass solenoid valve 500 to be opened.
In this embodiment, the first preset return air temperature may be represented by T1, and optionally, the first preset return air temperature is-3 to 0 ℃; the first preset exhaust temperature can be represented by T2, and optionally, the first preset exhaust temperature is 65-70 ℃. That is, when the return air temperature TH is less than or equal to the first preset return air temperature T1 and the exhaust air temperature TP is less than or equal to the first preset exhaust air temperature T2, the adjustment operation is performed, and the controller 400 controls the bypass solenoid valve 500 to open, so that the bypass heat exchange branch 200 is turned on.
In addition, the controller 400 is further configured to control the bypass electromagnetic valve 500 to close to cut off the bypass heat exchange branch 200 when the return air temperature is greater than or equal to the second preset return air temperature or the exhaust air temperature is greater than or equal to the second preset exhaust air temperature when the air conditioner 10 is in the heating operation. The second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
After the adjustment operation, that is, after the bypass heat exchange branch 200 is turned on, the return air temperature and the exhaust air temperature are increased. When the return air temperature is greater than or equal to the second preset return air temperature, the return air temperature is considered to be in the normal range, and the adjustment may not be needed, at this time, the adjustment operation may be exited, and the controller 400 controls the bypass electromagnetic valve 500 to be closed. Or when the exhaust temperature is greater than or equal to the second preset exhaust temperature, the exhaust temperature is considered to be close to the normal range, if the adjustment is continued, the unit may have a risk of high exhaust temperature, at this time, the adjustment action may be exited, and the controller 400 controls the bypass electromagnetic valve 500 to be closed. That is, when it is determined that the adjustment operation is to be stopped, the controller 400 controls the bypass solenoid valve 500 to close, only by satisfying one of the return air temperature determination and the exhaust air temperature determination.
In this embodiment, the second preset return air temperature may be represented by T3, and optionally, the second preset return air temperature is 5 to 7 ℃; the second preset exhaust temperature can be represented by T4, and optionally, the second preset exhaust temperature is 75-80 ℃. That is, when the return air temperature TH is greater than or equal to the second preset return air temperature T3, or when the exhaust air temperature TP is greater than or equal to the second preset exhaust air temperature T4, the adjusting operation is exited, the controller 400 controls the bypass electromagnetic valve 500 to close, so that the bypass heat exchange branch 200 is cut off, and the air conditioner 10 continues to perform the normal heating operation.
In summary, in the air conditioner 10 provided in the embodiment of the present invention, by providing the bypass heat exchange branch 200, when the air conditioner 10 is operated in a low-temperature environment for heating, if the return air temperature is low, the bypass heat exchange branch 200 is controlled to be turned on, and the heat exchange coil 210 heats the flowing refrigerant, so as to increase the temperature of the refrigerant, increase the return air temperature of the compressor 120, further increase the exhaust temperature of the compressor 120, and achieve the effect of increasing the indoor heating effect. In addition, since the heat exchange coil 210 exchanges heat with the compressor 120, heat generated by the compressor 120 can be effectively utilized, and the surface temperature of the compressor 120 is reduced by the heat exchange, thereby improving the reliability of the compressor 120.
Referring to fig. 4, in addition, an embodiment of the present invention further provides an air conditioner control method for controlling the air conditioner 10 of the above embodiment to increase the return air temperature of the compressor 120, further increase the exhaust air temperature, and improve the heating effect. In this embodiment, the controller 400 may implement or execute the air conditioner control method disclosed in the embodiments of the present invention. The air conditioner control method comprises the following steps:
step S100, the air conditioner 10 is controlled to perform heating operation.
In step S200, the return air temperature and the discharge air temperature of the compressor 120 during the heating operation of the air conditioner 10 are acquired.
In this embodiment, the return air temperature of the compressor 120 is detected by the return air sensor 310, and is sent to the controller 400; the discharge temperature of the compressor 120 is detected by the discharge sensor 320 and transmitted to the controller 400.
Step S300, judging whether the return air temperature is less than or equal to a first preset return air temperature and the exhaust air temperature is less than or equal to a first preset exhaust air temperature.
In this embodiment, it is first determined whether the return air temperature is less than or equal to a first preset return air temperature, where the first preset return air temperature may be-3 to 0 ℃, and if the return air temperature is less than or equal to the first preset return air temperature, the return air temperature is considered to be low, which affects the heating effect and can be adjusted. And then judging whether the exhaust temperature is less than or equal to a first preset exhaust temperature, wherein the first preset exhaust temperature can be 65-70 ℃, if the exhaust temperature is less than or equal to the first preset exhaust temperature, the exhaust temperature is lower than the temperature during normal heating operation and can be properly adjusted, and the improvement of the exhaust temperature does not influence the stability of the system. That is, when it is detected that the return air temperature is low, the exhaust gas temperature is determined without directly opening the bypass solenoid valve 500 to perform adjustment, and it is determined whether or not to open the bypass solenoid valve 500 to perform adjustment.
In step S400, if the return air temperature is less than or equal to the first preset return air temperature and the exhaust air temperature is less than or equal to the first preset exhaust air temperature, the bypass heat exchange branch 200 is controlled to be turned on.
In this embodiment, if the return air temperature is less than or equal to the first preset return air temperature and the exhaust air temperature is less than or equal to the first preset exhaust air temperature, it may be considered that the return air temperature is low and the exhaust air temperature is lower than the temperature during normal heating operation, and at this time, the adjustment is performed, so that the return air temperature may be increased, thereby increasing the exhaust air temperature, and it may be ensured that the adjustment is not performed when the exhaust air temperature itself is too high, so that the exhaust air temperature is further increased, thereby affecting the stability of the system.
At this time, the adjustment action is performed, the bypass electromagnetic valve 500 is controlled to be opened, so that the bypass heat exchange branch 200 is conducted, part of the low-temperature refrigerant separated by the gas-liquid separator 110 flows through the bypass heat exchange branch 200 from the first position 131, and heat exchange with the compressor 120 is realized through the heat exchange coil 210, so that the heat exchange coil 210 heats the flowing-through refrigerant, the temperature of the refrigerant is increased, the refrigerant heated by the heat exchange coil 210 is mixed with the refrigerant in the connecting pipeline 130 through the second position 132, and flows back to the compressor 120 through the air return port 121 together, the return air temperature of the compressor 120 is increased, the exhaust temperature of the compressor 120 is increased, and the effect of increasing the indoor heating effect is achieved. In addition, the heat exchange coil 210 exchanges heat with the compressor 120, so that heat generated by the compressor 120 can be effectively utilized, the surface temperature of the compressor 120 is reduced through heat exchange, and the reliability of the compressor 120 is improved.
Step S500, judging whether the return air temperature is greater than or equal to a second preset return air temperature or whether the exhaust temperature is greater than or equal to a second preset exhaust temperature, wherein the second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust temperature is greater than the first preset exhaust temperature.
In this embodiment, when the return air temperature is greater than or equal to a second preset return air temperature, the second preset return air temperature may be 5 to 7 ℃, and at this time, the return air temperature may be considered to be in a normal range, and may not need to be adjusted, or when the exhaust air temperature is greater than or equal to a second preset exhaust air temperature, the second preset exhaust air temperature may be 75 to 80 ℃, and at this time, the exhaust air temperature is considered to be close to the normal range, and if the adjustment is continued, the unit may have a risk of high exhaust air temperature.
In step S600, if the return air temperature is greater than or equal to the second preset return air temperature or the exhaust air temperature is greater than or equal to the second preset exhaust air temperature, the bypass heat exchange branch 200 is controlled to be turned off.
In this embodiment, when the return air temperature is greater than or equal to the second preset return air temperature, the return air temperature is already in the normal range, and at this time, the adjustment operation may be exited, and the bypass electromagnetic valve 500 is controlled to be closed. Or when the exhaust temperature is greater than or equal to the second preset exhaust temperature, the exhaust temperature approaches the normal range, and at this time, the adjustment action may be exited, and the bypass electromagnetic valve 500 is controlled to be closed. That is, the adjustment operation can be stopped only by either one of the return air temperature determination and the exhaust air temperature determination, and the controller 400 controls the bypass solenoid valve 500 to close.
In this embodiment, in step S600, if the return air temperature is not higher than or equal to the second preset return air temperature or the exhaust air temperature is higher than or equal to the second preset exhaust air temperature, step S400 is continuously executed to control the bypass heat exchange branch 200 to be conducted.
In summary, in the air conditioner control method provided by the embodiment of the present invention, when the air conditioner 10 is in heating operation, when the return air temperature is less than or equal to a first preset return air temperature and the exhaust air temperature is less than or equal to a first preset exhaust air temperature, namely, the return air temperature is considered to be lower, the heating effect is influenced, the adjustment can be carried out, and the exhaust temperature is lower than the temperature in normal operation, can be properly adjusted, the temperature of the heat exchanger can be improved without affecting the stability of the system, at the moment, the bypass heat exchange branch 200 is controlled to be conducted, so that the heat exchange coil 210 exchanging heat with the compressor 120 heats the refrigerant flowing through the bypass heat exchange branch 200 to improve the return temperature, thereby increasing the exhaust temperature and the indoor heating effect, and simultaneously the low-temperature refrigerant absorbs heat from the compressor 120 through the heat exchange coil 210, the surface temperature of the compressor 120 can be effectively reduced, and the operation stability of the compressor 120 can be improved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An air conditioner comprises a gas-liquid separator (110) and a compressor (120), and is characterized in that the air conditioner (10) further comprises a bypass heat exchange branch (200), one end of the bypass heat exchange branch (200) is connected to a first position (131) on a connecting pipeline (130) between the gas-liquid separator (110) and a return air port (121) of the compressor (120), the other end of the bypass heat exchange branch is connected to a second position (132) on the connecting pipeline (130), a heat exchange coil (210) is arranged on the bypass heat exchange branch (200), the heat exchange coil (210) is wound outside the compressor (120) and can exchange heat with the compressor (120), the bypass heat exchange branch (200) is selectively conducted so that the heat exchange coil (210) exchanging heat with the compressor (120) heats refrigerant flowing through the bypass heat exchange branch (200), to increase the return air temperature of the compressor (120).
2. The air conditioner as claimed in claim 1, wherein the heat exchanging coil (210) is wound outside a portion below at least a middle portion of the compressor (120).
3. The air conditioner according to claim 1, further comprising a controller (400) and a bypass solenoid valve (500), wherein the bypass solenoid valve (500) is disposed on the bypass heat exchange branch (200) and electrically connected to the controller (400);
the controller (400) is used for controlling the bypass electromagnetic valve (500) to be opened to enable the bypass heat exchange branch (200) to be conducted if the return air temperature of the compressor (120) is less than or equal to a first preset return air temperature and the exhaust air temperature of the compressor (120) is less than or equal to a first preset exhaust air temperature when the air conditioner (10) is in heating operation.
4. The air conditioner according to claim 3, wherein the controller (400) is further configured to control the bypass solenoid valve (500) to close to cut off the bypass heat exchanging branch (200) if the return air temperature is greater than or equal to a second preset return air temperature or the exhaust air temperature is greater than or equal to a second preset exhaust air temperature when the air conditioner (10) is in heating operation, wherein the second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust air temperature is greater than the first preset exhaust air temperature.
5. The air conditioner as claimed in claim 3, wherein the bypass heat exchange branch (200) comprises a first connection branch (220) and a second connection branch (230), one end of the first connection branch (220) is connected to the first position (131), the other end of the first connection branch is connected to one end of the heat exchange coil (210), the other end of the heat exchange coil (210) is connected to the second position (132) through the second connection branch (230), and the bypass solenoid valve (500) is disposed on the first connection branch (220).
6. The air conditioner according to claim 1, wherein the first location (131) is closer to the gas-liquid separator (110) than the second location (132).
7. The air conditioner control method is applied to an air conditioner (10), wherein the air conditioner (10) comprises a gas-liquid separator (110) and a compressor (120), and is characterized in that the air conditioner (10) further comprises a bypass heat exchange branch (200), one end of the bypass heat exchange branch (200) is connected to a first position (131) on a connecting pipeline (130) between the gas-liquid separator (110) and a return air port (121) of the compressor (120), the other end of the bypass heat exchange branch is connected to a second position (132) on the connecting pipeline (130), a heat exchange coil (210) is arranged on the bypass heat exchange branch (200), and the heat exchange coil (210) is wound outside the compressor (120) and can exchange heat with the compressor (120); the air conditioner (10) control method includes:
acquiring the return air temperature and the exhaust air temperature of the compressor (120) when the air conditioner (10) operates in heating;
judging whether the return air temperature is less than or equal to a first preset return air temperature and the exhaust air temperature is less than or equal to a first preset exhaust air temperature;
if the return air temperature is less than or equal to the first preset return air temperature and the exhaust air temperature is less than or equal to the first preset exhaust air temperature, the bypass heat exchange branch (200) is controlled to be conducted, so that the heat exchange coil (210) exchanging heat with the compressor (120) heats the refrigerant flowing through the bypass heat exchange branch (200), and the return air temperature is increased.
8. The air conditioner control method according to claim 7, wherein after the step of controlling the conduction of the bypass heat exchange branch (200), the method further comprises:
judging whether the return air temperature is greater than or equal to a second preset return air temperature or whether the exhaust temperature is greater than or equal to a second preset exhaust temperature, wherein the second preset return air temperature is greater than the first preset return air temperature, and the second preset exhaust temperature is greater than the first preset exhaust temperature;
if the return air temperature is greater than or equal to the second preset return air temperature or the exhaust temperature is greater than or equal to the second preset exhaust temperature, the bypass heat exchange branch (200) is controlled to be cut off;
and if the return air temperature is not higher than or equal to the second preset return air temperature or the exhaust temperature is higher than or equal to the second preset exhaust temperature, continuing to execute the step of controlling the conduction of the bypass heat exchange branch (200).
9. The air conditioner control method according to claim 8, wherein the second preset return air temperature is 5 to 7 ℃ and the second preset exhaust air temperature is 75 to 80 ℃.
10. The air conditioner controlling method according to claim 7, wherein the first preset return air temperature is-3 to 0 ℃ and the first preset exhaust air temperature is 65 to 70 ℃.
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| CN202010568353.7A CN111664541A (en) | 2020-06-19 | 2020-06-19 | Air conditioner and control method thereof |
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| CN202010568353.7A CN111664541A (en) | 2020-06-19 | 2020-06-19 | Air conditioner and control method thereof |
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| JP2001091082A (en) * | 1999-09-20 | 2001-04-06 | Fujitsu General Ltd | Air conditioner |
| JP2016142417A (en) * | 2015-01-30 | 2016-08-08 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN109059333A (en) * | 2018-06-19 | 2018-12-21 | 广东美的制冷设备有限公司 | Air conditioner, the control method of air conditioner and storage medium |
| CN109539401A (en) * | 2018-11-13 | 2019-03-29 | 珠海格力电器股份有限公司 | A kind of air-conditioning and control method |
| CN110131856A (en) * | 2019-05-20 | 2019-08-16 | 广东美的制冷设备有限公司 | The control method of air conditioner and air conditioner |
| CN110529965A (en) * | 2019-09-09 | 2019-12-03 | 宁波奥克斯电气股份有限公司 | A kind of low-temperature heating air conditioner system and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001091082A (en) * | 1999-09-20 | 2001-04-06 | Fujitsu General Ltd | Air conditioner |
| JP2016142417A (en) * | 2015-01-30 | 2016-08-08 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Air conditioner |
| CN109059333A (en) * | 2018-06-19 | 2018-12-21 | 广东美的制冷设备有限公司 | Air conditioner, the control method of air conditioner and storage medium |
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