CN109140817B - Air conditioner using heating device and control method thereof - Google Patents
Air conditioner using heating device and control method thereof Download PDFInfo
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- CN109140817B CN109140817B CN201811300585.3A CN201811300585A CN109140817B CN 109140817 B CN109140817 B CN 109140817B CN 201811300585 A CN201811300585 A CN 201811300585A CN 109140817 B CN109140817 B CN 109140817B
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/01—Heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
An air conditioner using heating device and its control method, the air conditioner is by the compressor, four-way valve, indoor heat exchanger, throttling gear, outdoor heat exchanger, air suction pipe, liquid reservoir, air suction insertion pipe that link up sequentially, and the additional heating device adopting corresponding control method, the said heating device can be set up in the inferior part oil pool of the compressor, liquid reservoir, air suction insertion pipe or air suction pipe; the invention also discloses a control method of the air conditioner, which comprises the following steps: the heating device is started when the air conditioner is in a heating mode or a defrosting mode and the refrigerant at the heating device is in a two-phase state, and additional heat is transferred to the heating device, so that the liquid refrigerant is gasified, the circulation quantity of the refrigerant in the system is improved, lubricating oil in the compressor is prevented from entering the system to reside, and the reliability problem caused by the fact that the circulation quantity of the refrigerant in the system is too small and the lubricating oil is too much in the heating and defrosting processes of the air conditioner is solved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner using a heating device and a control method thereof, which greatly improve the reliability of a heat pump type air conditioner and a compressor, in particular to an air conditioner using R290 refrigerant.
Background
When the air conditioner heats and defrost in winter with lower outdoor temperature, the temperature of the oil pool of the compressor is greatly reduced, the solubility of the refrigerant in the oil pool is greatly increased, so that the viscosity of the lubricating oil is rapidly reduced, and meanwhile, the suction of the compressor brings liquid, so that the normal operation of the compressor is influenced.
The lubrication oil in the compressor of the air conditioner is extremely important for the normal operation of the system, the compressor lubrication system supplies oil to each friction part of the compressor, and three main aspects are left and right in the compressor: reducing friction, sealing and carrying away heat and abrasive dust generated by friction. Ensuring that the viscosity and temperature of the compressor sump are at normal levels is important to air conditioning cycles, and if a significant amount of lubricant enters the system when the compressor temperature is too low, it may remain in the system, creating localized significant accumulation of lubricant that blocks the piping, making the air conditioner unable to operate properly.
The indoor and outdoor fans are all in the closed state in the reverse circulation defrosting process, the air conditioner has little heat transfer at the indoor side, the energy for defrosting is derived from the heat stored by the system in the end of compressor power consumption and heating, and because the throttle opening is larger in the defrosting process, the condensing temperature and the evaporating temperature are lower than the heating process, the air suction is kept in a low-temperature two-phase area for a long time in the defrosting process, and if liquid enters the compressor, the compressor is possibly damaged due to liquid impact. The continuous decrease of the temperature of the compressor leads to lower temperature of the oil pool of the compressor compared with the temperature of the oil pool of the compressor during heating circulation, the exhaust pressure is continuously increased during defrosting, the solubility of the refrigerant in the oil pool is continuously increased by the two points, a large amount of refrigerant is dissolved into the oil pool, the defrosting efficiency is greatly influenced, the viscosity of the oil pool is continuously reduced, and if the defrosting time is too long, the damage to the compressor is possibly caused by too low viscosity. When defrosting is finished and the heat is regenerated, a large amount of refrigerant exists in a liquid state in the accumulator, the compressor does not participate in the system circulation, the refrigerant of the air conditioner is lack, the proportion of lubricating oil is increased, and the normal operation of the system is affected.
Meanwhile, when the working conditions are switched, the exhaust pressure of the high back pressure compressor is reduced, the solubility of the oil pool is rapidly reduced, a large amount of refrigerant is flashed from the oil pool and is escaped, a large amount of lubricating oil is carried into the system, and the safe operation of the defrosting operation, the reheating air conditioner after the defrosting operation is finished and the internal compressor is not good.
For the R290 heat pump air conditioner system, the characteristics of small density, small adiabatic index, low exhaust temperature and low filling quantity can cause the temperature of an oil pool in the compressor to be lower than that of a Freon system. When heating at low temperature, the air suction temperature and the air discharge temperature of the R290 air conditioner are reduced, the temperature of the oil pool is lower than that of the normal working condition, more refrigerant can be dissolved in the oil pool, and the viscosity of the oil pool is lower. Because R290 has a limited charge and tends to be less than its optimal charge, the proportion of dissolved refrigerant in the sump increases, resulting in less circulating refrigerant in the system, which is detrimental to its heating capacity and efficiency.
Taking the heating and defrosting process of an R290 air conditioner using NM100 lubricating oil at the temperature of minus 7 ℃ as an example, the viscosity of an oil pool in the middle and later stages of heating and defrosting is at a lower value, and the solubility of a refrigerant in the oil pool is large, so that adverse effects on heating and defrosting are caused. When defrosting is carried out, the solubility is greatly reduced, a large amount of refrigerant is flashed and escaped, lubricating oil is carried into the system, and the defrosting efficiency and the safe operation of the air conditioner are influenced; meanwhile, a large amount of refrigerant exists in the liquid state accumulator in the late defrosting stage, so that the circulating quantity of the refrigerant in the system is greatly reduced.
Disclosure of Invention
The invention aims to provide an air conditioner using a heating device and a control method thereof, and solves a series of problems of low viscosity of an oil pool, overlarge solubility of the oil pool, liquid carrying in air suction, reduction of system refrigerant circulation and system faults caused by excessive lubricating oil entering a system from a compressor when the air conditioner heats and defrosts at lower air suction and exhaust temperatures through inputting additional heat.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an air conditioner using a heating device comprises a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a throttling device 4, an outdoor heat exchanger 5, an air suction pipe 6, a liquid storage device 7, an air suction insertion pipe 8 and a heating device 9 which are sequentially connected, wherein the heating device 9 is used in the heating and defrosting processes of the air conditioner, and heat is transmitted to the setting position of the heating device;
when the four-way reversing valve is switched to a heating mode, the outlet of the compressor 1 is connected with the inlet of the indoor heat exchanger 3 through one flow path of the four-way valve 2, the outlet of the indoor heat exchanger 3 is connected with the inlet of the outdoor heat exchanger 5 through a pipeline and the throttling device 4, the outlet of the outdoor heat exchanger 5 is connected with the inlet of the liquid storage device 7 through the other flow path of the four-way valve 2 through the air suction pipe 6, and the outlet of the liquid storage device 7 is connected with the inlet of the compressor 1 through the air suction pipe 8 to form a heating mode circulation loop; the refrigerant flows through the four-way valve 2 from the exhaust port of the compressor 1 to enter the indoor heat exchanger 3 to release heat, is throttled by the throttling device 4 and then absorbed by the outdoor heat exchanger 5, and then enters the air suction pipe 6, the liquid storage device 7 and the air suction insertion pipe 8 through the other flow path of the four-way valve 2 to return to the compressor 1;
when the four-way reversing valve is switched to a defrosting mode, the outlet of the compressor 1 is connected with the inlet of the outdoor heat exchanger 5 through one flow path of the four-way valve 2, the outlet of the outdoor heat exchanger 5 is connected with the inlet of the indoor heat exchanger 3 through a pipeline and the throttling device 4, the outlet of the indoor heat exchanger 3 is connected with the inlet of the liquid storage device 7 through the other flow path of the four-way valve 2 through the air suction pipe 6, and the outlet of the liquid storage device 7 is connected with the inlet of the compressor 1 through the air suction pipe 8 to form a defrosting mode circulation loop; the refrigerant flows through the four-way valve 2 from the exhaust port of the compressor 1 to enter the outdoor heat exchanger 5 to be defrosted to release heat, is throttled by the throttling device 4 and then absorbed by the indoor heat exchanger 3, and then enters the air suction pipe 6, the liquid storage device 7 and the air suction insertion pipe 8 through the other flow path of the four-way valve 2 to return to the compressor 1;
the heating device 9 is arranged at the positions of the suction cannula 8, the liquid storage device 7, the suction pipe 6 and the lower oil pool of the compressor 1; when the heating device 9 is turned on, the refrigerant is heated by the additional heat input and transferred by the heating device 9 at the position where the heating device is arranged, and the local temperature of the refrigerant is increased, so that the viscosity of an oil pool, the dryness of an air inlet of a compressor and the circulation quantity of the refrigerant of the system are ensured.
The heating device 9 is a heating wire, a heat storage device or a heat conduction device with an additional flow channel which is externally wrapped, internally installed and connected in a pipeline mode and is installed at the set position.
The refrigerant of the air conditioner is a low charge amount flammable refrigerant R290.
According to the control method of the air conditioner using the heating device, the air conditioner is in a set heating or defrosting mode, the refrigerant at the setting position of the heating device is in a two-phase state, namely a large amount of liquid refrigerant is accumulated, and when the conditions are met, the heating device is started to transmit heat to the setting position of the heating device; the heating device is in a closed state when the air conditioner is in normal operation;
the specific control method is as follows:
when the heating device 9 is arranged at the suction cannula 8: when the outdoor ambient temperature is Th, the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, and the temperature T8 at the suction pipe 8 is reduced below the outdoor ambient temperature Th, the refrigerant in the suction pipe 8 is in a two-phase state, the heating device 9 is started, the liquid refrigerant carried by suction is evaporated by inputting heat, and the temperature at the suction pipe 8 is increased; when the temperature T8 at the suction cannula 8 rises back to 20 ℃ above the outdoor ambient temperature Th, the heating device 9 is turned off; when the air conditioner is in a defrosting mode and the temperature T8 at the air suction insertion pipe 8 is reduced to be lower than 0 ℃, the heating device 9 is started until the temperature T8 at the air suction insertion pipe 8 reaches the highest value of T8 in the heating mode or until the defrosting mode is finished;
when the heating device 9 is arranged in the reservoir 7: when the temperature T7 of the liquid reservoir 7 is reduced to below the temperature T5-5 ℃ between the throttling device 4 and the outdoor heat exchanger 5 after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the liquid reservoir 7 is in a two-phase state, the heating device 9 is started, heat is input to evaporate the liquid refrigerant in the liquid reservoir 7, and the temperature of the liquid reservoir is increased; when the temperature T7 of the liquid reservoir 7 rises to a temperature above the temperature T5 between the throttling device 4 and the outdoor heat exchanger 5, the heating device 9 is turned off; when the air conditioner is in the defrosting mode and the temperature T7 of the liquid reservoir 7 decreases with the increase of the running time, the heating device 9 is started until the temperature T7 of the liquid reservoir 7 reaches the highest value of T7 in the heating mode or until the defrosting mode is finished;
when the heating device 9 is arranged at the suction pipe 6: when the temperature T6 of the air suction pipe 6 is reduced to below the temperature T5-5 ℃ between the throttling device 4 and the outdoor heat exchanger 5 after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the air suction pipe 6 is in a two-phase state, the heating device 9 is started, heat is input to evaporate liquid refrigerant in the air suction pipe 6, and the temperature of the air suction pipe is increased; when the temperature T6 of the air suction pipe 6 is raised to be more than the temperature T5 between the throttling device 4 and the outdoor heat exchanger 5, the heating device 9 is turned off; when the air conditioner is in the defrosting mode and the temperature T6 of the air suction pipe 6 is reduced along with the increase of the running time, the heating device 9 is started until the temperature T6 of the air suction pipe 6 reaches the highest value of T6 in the heating mode or until the defrosting mode is finished;
when the heating device 9 is arranged at the lower oil sump of the compressor 1: the heating device 9 is turned on 5 to 10 minutes before the heating mode of the air conditioner is finished, and the refrigerant dissolved into the oil pool due to temperature drop at the final stage of the heating mode is evaporated; when the air conditioner is in the defrost mode, when the oil pool temperature T1 decreases as the operation time increases, the heating device 9 is turned on until the oil pool temperature T1 reaches the maximum value of T1 in the heating mode or until the defrost mode ends.
Compared with the prior art, the invention has the following advantages:
1. compared with the traditional air conditioner, the air conditioner adopting the heating device can ensure that the air suction pipe refrigerant is in a gaseous state in the low-temperature heating terminal stage and defrosting process, and prevent the compressor from being damaged due to liquid compression.
2. Compared with the traditional air conditioner, the air conditioner adopting the heating device can improve the temperature of the oil pool in the low-temperature heating terminal stage and defrosting process, reduce the dissolved refrigerant in the lubricating oil, and prevent a large amount of refrigerant from flashing from the oil pool when the working condition changes, and carry the lubricating oil into the system to influence the normal operation of the system.
3. Compared with the traditional air conditioner, the air conditioner adopting the heating device has the advantages that the temperature of the air suction pipe is increased, the refrigerant storage amount in the liquid storage device is reduced, the refrigerant circulation amount of the system is increased, and excessive accumulation of lubricating oil in the system is prevented.
Drawings
Fig. 1 is a schematic view of an air conditioner in which a heating device of the present invention is installed at an inhalation cannula.
Fig. 2 is a schematic view of an air conditioner in which the heating device of the present invention is installed in a reservoir.
Fig. 3 is a schematic view of an air conditioner in which the heating apparatus of the present invention is installed at an air suction pipe.
Fig. 4 is a schematic view of an air conditioner in which the heating apparatus of the present invention is installed at a lower oil sump of a compressor.
Fig. 5 is a state diagram of an air conditioner refrigerant in which a heating device is installed at a suction pipe.
Fig. 6-1 is a schematic view of a heating wire heating apparatus installed outside an air suction pipe.
Fig. 6-2 is a schematic view of the heating wire heating device installed outside the suction cannula.
Detailed Description
The invention will be further described with reference to the drawings and detailed description which follow, for better explaining the objects, features and advantages of the invention.
Embodiment 1:
as shown in fig. 1, the air conditioner with the heating device installed at the suction pipe comprises a heating device 9 installed at the suction pipe, a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a throttling device 4, an outdoor heat exchanger 5, a suction pipe 6, a liquid reservoir 7 and a suction pipe 8 which are sequentially connected. When the outdoor ambient temperature is Th, the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, and the temperature T8 at the suction pipe 8 is reduced below the outdoor ambient temperature Th, the refrigerant in the suction pipe 8 is in a two-phase state, the heating device 9 is started, the liquid refrigerant carried by suction is evaporated by inputting heat, and the temperature at the suction pipe 8 is increased; when the temperature T8 at the suction cannula 8 rises back to 20 c above the outdoor ambient temperature Th, the heating means 9 are turned off. When the air conditioner is in defrost mode and the temperature T8 at the suction cannula 8 falls below 0 c, the heating means 9 is turned on until the temperature T8 at the suction cannula 8 reaches the highest value of T8 in heating mode or until the defrost mode is ended.
Embodiment 2:
as shown in fig. 2, the air conditioner with a heating device installed in a liquid reservoir according to the present embodiment includes a heating device 9 attached in a liquid reservoir 7, a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a throttle device 4, an outdoor heat exchanger 5, an air intake pipe 6, a liquid reservoir 7, and an air intake pipe 8, which are sequentially connected. When the temperature T7 of the liquid reservoir 7 is reduced to below the temperature T5-5 ℃ between the throttling device 4 and the outdoor heat exchanger 5 after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the liquid reservoir 7 is in a two-phase state, the heating device 9 is started, heat is input to evaporate the liquid refrigerant in the liquid reservoir 7, and the temperature of the liquid reservoir is increased; when the temperature T7 of the reservoir 7 rises back to a temperature above the temperature T5 between the throttle device 4 and the outdoor heat exchanger 5, the heating device 9 is turned off. When the air conditioner is in the defrost mode and the temperature T7 of the reservoir 7 decreases as the run time increases, the heating means 9 is turned on until the temperature T7 of the reservoir 7 reaches the highest value of T7 in the heating mode or until the defrost mode ends.
Embodiment 3:
as shown in fig. 3, the air conditioner of the present embodiment, in which the heating device is installed at the suction pipe, comprises an additional heating device 9, a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a throttling device 4, an outdoor heat exchanger 5, a suction pipe 6, a liquid reservoir 7 and a suction pipe 8, which are sequentially connected. When the temperature T6 of the air suction pipe 6 is reduced to below the temperature T5-5 ℃ between the throttling device 4 and the outdoor heat exchanger 5 after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the air suction pipe 6 is in a two-phase state, the heating device is started, heat is input to evaporate liquid refrigerant in the air suction pipe 6, and the temperature of the air suction pipe is increased; when the temperature T6 of the intake pipe 6 rises to a temperature above the temperature T5 between the throttle device 4 and the outdoor heat exchanger 5, the heating device 9 is turned off. When the air conditioner is in the defrost mode and the temperature T6 of the suction duct 6 decreases as the operating time increases, the heating device 9 is turned on until the temperature T6 of the suction duct 6 reaches the maximum value of T6 in the heating mode or until the defrost mode ends.
Embodiment 4:
as shown in fig. 4, the air conditioner of this embodiment, in which the heating device is installed at the lower oil sump in the compressor, comprises a heating device 9 attached to the oil sump, a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a throttle device 4, an outdoor heat exchanger 5, an air suction pipe 6, a liquid reservoir 7 and an air suction pipe 8 which are connected in this order. The heating means 9 is turned on 5 to 10 minutes before the end of the heating mode of the air conditioner, and the refrigerant dissolved into the oil pool due to the temperature drop at the end of the heating mode is evaporated. When the air conditioner is in the defrost mode, when the oil pool temperature T1 decreases as the operation time increases, the heating device 9 is turned on until the oil pool temperature T1 reaches the maximum value of T1 in the heating mode or until the defrost mode ends.
For the heating device to be arranged in different positions: the heating device is used for heating the oil pool, so that the amount of the refrigerant dissolved in the oil pool can be reduced, the viscosity of the lubricating oil in the oil pool is improved, the normal operation of the compressor is ensured, the amount of the refrigerant residing in the compressor enters the system, the circulation amount and the efficiency of the refrigerant of the system are improved, and adverse effects on the air conditioner due to too little refrigerant and too much lubricating oil in the air conditioner pipeline are prevented.
As shown in fig. 5, the air-conditioning refrigerant state diagram is shown, the air suction pipe is heated, the two-phase refrigerant in the state a of the air suction pipe can be heated to the high-temperature overheat gas state in the state B, the hydraulic compression of the compressor is prevented, the normal operation of the compressor is ensured, the liquid refrigerant resident in the liquid storage device is promoted to be gasified and enter the system, the refrigerant circulation quantity and efficiency of the system are improved, and adverse effects on the air conditioner due to too little refrigerant and too much lubricating oil are prevented. The oil pool can be indirectly heated, the amount of the refrigerant dissolved in the oil pool is reduced, the viscosity of the lubricating oil in the oil pool is improved, and the normal operation of the compressor is ensured.
Fig. 6-1 is a schematic view of a heating wire heating apparatus installed outside a suction pipe of a compressor. Fig. 6-2 is a schematic view of a heating wire heating device installed outside a suction cannula of a compressor.
The power W required by the heating device in the process h Can be operated according to the normal heating operation power W n Low-temperature heating and defrosting operation power W a Estimation results:
W h ＝k*(W n -W a )
the power W required by the heating device h Heat quantity M.multidot.h of the refrigerant liquid quantity M in the oil pool and the liquid storage device in a given time t 1 The required acquisition is as follows:
W h ＝k*(M*h l )/t
in the heating mode, the influence of starting the heating device on the heating of the air conditioner can be evaluated as follows: additional power consumption W for heating device h In addition to balancing heat Q emitted to the environment by the heated component due to the heating temperature difference b Most of the other heat Q a The efficiency η of the additional heat carried by the heated refrigerant into the heat exchanger feed chamber can be expressed as:
η＝Q a /W h
besides the direct influence of the input heat on the heating quantity, after the heating device is started, the liquid refrigerant at the liquid storage and the air suction pipe is gasified to improve the circulation quantity of the system refrigerant, thereby indirectly improving the heating quantity Q c The total heating amount Q added after heating is turned on can be expressed as:
Q＝Q a +Q c 。
Claims (3)
1. the control method of the air conditioner using the heating device comprises a compressor (1), a four-way valve (2), an indoor heat exchanger (3), a throttling device (4), an outdoor heat exchanger (5), an air suction pipe (6), a liquid storage device (7), an air suction insertion pipe (8) and a heating device (9) which are sequentially connected, wherein the air conditioner uses the heating device (9) in the heating and defrosting processes, and transmits heat to the setting of the heating device;
when the four-way reversing valve is switched to a heating mode, the outlet of the compressor (1) is connected with the inlet of the indoor heat exchanger (3) through one flow path of the four-way valve (2), the outlet of the indoor heat exchanger (3) is connected with the inlet of the outdoor heat exchanger (5) through a pipeline and a throttling device (4), the outlet of the outdoor heat exchanger (5) is connected with the inlet of the liquid storage device (7) through the other flow path of the four-way valve (2) through the air suction pipe (6), and the outlet of the liquid storage device (7) is connected with the inlet of the compressor (1) through the air suction insertion pipe (8) to form a heating mode circulation loop; the refrigerant flows through the four-way valve (2) from the exhaust port of the compressor (1) to enter the indoor heat exchanger (3) to release heat, is throttled by the throttling device (4) and then absorbed by the outdoor heat exchanger (5), and then enters the air suction pipe (6), the liquid storage device (7) and the air suction insertion pipe (8) through the other flow path of the four-way valve (2) to return to the compressor (1);
when the four-way reversing valve is switched to a defrosting mode, the outlet of the compressor (1) is connected with the inlet of the outdoor heat exchanger (5) through one flow path of the four-way valve (2), the outlet of the outdoor heat exchanger (5) is connected with the inlet of the indoor heat exchanger (3) through a pipeline and the throttling device (4), the outlet of the indoor heat exchanger (3) is connected with the inlet of the liquid storage device (7) through the other flow path of the four-way valve (2) through the air suction pipe (6), and the outlet of the liquid storage device (7) is connected with the inlet of the compressor (1) through the air suction insertion pipe (8) to form a defrosting mode circulation loop; the refrigerant flows through the four-way valve (2) from the exhaust port of the compressor (1) to enter the outdoor heat exchanger (5) to be defrosted to release heat, is throttled by the throttling device (4) and then absorbed by the indoor heat exchanger (3), and then enters the air suction pipe (6), the liquid storage device (7) and the air suction insertion pipe (8) through the other flow path of the four-way valve (2) to return to the compressor (1);
the heating device (9) is arranged at the position of the suction cannula (8), in the liquid storage device (7), at the position of the suction pipe (6) and at the position of the lower oil pool of the compressor (1); when the heating device (9) is turned on, the refrigerant is heated by the additional heat input and transferred by the heating device (9) at the position where the heating device is arranged, and the local temperature of the refrigerant is increased to ensure the viscosity of an oil pool, the dryness of an air inlet of a compressor and the circulation quantity of the refrigerant of the system;
the method is characterized in that: the control method comprises the following steps: the air conditioner is in a set heating or defrosting mode, the refrigerant at the setting position of the heating device is in a two-phase state, namely a large amount of liquid refrigerant is accumulated, and when the conditions are met, the heating device is started to transmit heat to the setting position of the heating device; the heating device is in a closed state when the air conditioner is in normal operation;
the specific control method is as follows:
when the heating device (9) is arranged at the inhalation cannula (8): when the outdoor ambient temperature is Th, the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, and when the temperature T8 at the air suction insertion pipe (8) is reduced to be lower than the outdoor ambient temperature Th, the refrigerant in the air suction insertion pipe (8) is in a two-phase state, a heating device (9) is started, heat is input to evaporate liquid refrigerant carried by air suction, and the temperature at the air suction insertion pipe (8) is increased; when the temperature T8 at the suction cannula (8) rises to 20 ℃ above the outdoor environment temperature Th, the heating device (9) is turned off; when the air conditioner is in a defrosting mode and the temperature T8 at the air suction insertion pipe (8) is reduced to be lower than 0 ℃, starting the heating device (9) until the temperature T8 at the air suction insertion pipe (8) reaches the highest value of T8 in the heating mode or until the defrosting mode is finished;
when the heating device (9) is arranged in the liquid reservoir (7): when the temperature T7 of the liquid storage device (7) is reduced to below the temperature T5-5 ℃ between the throttling device (4) and the outdoor heat exchanger (5) after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the liquid storage device (7) is in a two-phase state, the heating device (9) is started, and the liquid refrigerant in the liquid storage device (7) is evaporated by inputting heat and the temperature of the liquid storage device is increased; when the temperature T7 of the liquid reservoir (7) is increased to be more than the temperature T5 between the throttling device (4) and the outdoor heat exchanger (5), the heating device (9) is turned off; when the air conditioner is in a defrosting mode and the temperature T7 of the liquid reservoir (7) decreases along with the increase of the running time, the heating device (9) is started until the temperature T7 of the liquid reservoir (7) reaches the highest value of T7 in the heating mode or until the defrosting mode is finished;
when the heating device (9) is arranged at the air suction pipe (6): when the temperature T6 of the air suction pipe (6) is reduced to below the temperature T5-5 ℃ between the throttling device (4) and the outdoor heat exchanger (5) after the air conditioner is in a heating mode and is normally operated for more than 10 to 20 minutes, the refrigerant in the air suction pipe (6) is in a two-phase state, the heating device (9) is started, the liquid refrigerant in the air suction pipe (6) is evaporated by inputting heat, and the temperature of the air suction pipe is increased; when the temperature T6 of the air suction pipe (6) is increased to be more than the temperature T5 between the throttling device (4) and the outdoor heat exchanger (5), the heating device (9) is turned off; when the air conditioner is in a defrosting mode and the temperature T6 of the air suction pipe (6) decreases along with the increase of the running time, the heating device (9) is started until the temperature T6 of the air suction pipe (6) reaches the highest value of T6 in the heating mode or until the defrosting mode is finished;
when the heating device (9) is arranged at the lower oil pool of the compressor (1): opening a heating device (9) 5 to 10 minutes before the heating mode of the air conditioner is finished, and evaporating the refrigerant dissolved into the oil pool due to temperature reduction at the final stage of the heating mode; when the air conditioner is in a defrosting mode, and when the oil pool temperature T1 is reduced along with the increase of the operation time, the heating device (9) is started until the oil pool temperature T1 reaches the highest value of T1 in the heating mode or until the defrosting mode is finished.
2. The control method of an air conditioner using a heating apparatus according to claim 1, wherein: the heating device (9) is a heating wire, a heat storage device or a heat conduction device with an additional flow channel which is externally wrapped, internally installed and connected in a pipeline mode and is installed at the setting position.
3. The control method of an air conditioner using a heating apparatus according to claim 1, wherein: the refrigerant of the air conditioner is a low charge amount flammable refrigerant R290.
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