CN109357369B - Air conditioner and refrigerant recovery control method thereof - Google Patents
Air conditioner and refrigerant recovery control method thereof Download PDFInfo
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- CN109357369B CN109357369B CN201811052142.7A CN201811052142A CN109357369B CN 109357369 B CN109357369 B CN 109357369B CN 201811052142 A CN201811052142 A CN 201811052142A CN 109357369 B CN109357369 B CN 109357369B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an air conditioner and a refrigerant recovery control method thereof. The air conditioner comprises a compressor (1), an outdoor heat exchanger (2), a first electronic expansion valve (3), a first stop valve (4), an indoor heat exchanger (5), a second stop valve (6) and a first electric control valve, wherein the first electronic expansion valve (3) is arranged between the first stop valve (4) and the outdoor heat exchanger (2), and the first electric control valve is arranged between the second stop valve (6) and the compressor (1). According to the air conditioner, the refrigerant can be automatically recovered, and the operation complexity is reduced.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to an air conditioner and a refrigerant recovery control method thereof.
Background
The household air conditioner needs to recover refrigerants in a system into an outdoor unit under the conditions of after-sale maintenance and the like, and the conventional method is to start a refrigeration mode of the air conditioner, manually close a stop valve on a connecting pipeline between a condenser and an indoor evaporator, close the stop valve on a connecting pipeline between the indoor evaporator and a suction end of a compressor after a certain time, and finally shut down the air conditioner. Whether the refrigerant is completely recovered or not needs to see the experience of an operator, if the recovery time is too short, the refrigerant can not be completely recovered, and if the recovery time is too long, the compressor can be damaged due to the idle load in a long time.
Disclosure of Invention
Therefore, an object of the present invention is to provide an air conditioner and a refrigerant recovery control method thereof, which can achieve automatic recovery of refrigerant and reduce the complexity of operation.
In order to solve the above problems, the present invention provides an air conditioner including a compressor, an outdoor heat exchanger, a first electronic expansion valve, a first stop valve, an indoor heat exchanger, a second stop valve, and a first electronic control valve, wherein the first electronic expansion valve is disposed between the first stop valve and the outdoor heat exchanger, and the first electronic control valve is disposed between the second stop valve and the compressor.
Preferably, the air conditioner further comprises a four-way valve, the four-way valve is connected with the compressor, and the first electric control valve is arranged between the second stop valve and the four-way valve.
Preferably, the air conditioner further comprises an alarm for giving an alarm after the air conditioner reaches the refrigerant recovery completion condition.
Preferably, the first electric control valve is a second electronic expansion valve or an electromagnetic two-way valve.
According to another aspect of the present invention, there is provided a refrigerant recycling control method of the air conditioner, including: controlling the air conditioner to start a refrigerant recovery mode; controlling the air conditioner to run in a refrigeration mode; controlling the first electronic expansion valve to be closed and controlling the first electronic control valve to be opened; detecting whether the operation of the air conditioner meets a preset condition or not; and when the preset condition is met, judging that the air conditioner finishes fluorine collection, and controlling the first electric control valve to be closed.
Preferably, the step of controlling the air conditioner to operate the cooling mode includes: detecting the indoor environment temperature; comparing the indoor environment temperature with the lower limit temperature of the air conditioner operation refrigeration; and if the indoor environment temperature is lower than the lower limit temperature of the air conditioner for operation refrigeration, the air conditioner is forced to start a refrigeration mode.
Preferably, the step of controlling the closing of the first electronic expansion valve comprises: after the air conditioner operates in the refrigeration mode T1 or operates to the set frequency P0, the first electronic expansion valve is adjusted to be in a fully closed state, and the average exhaust temperature T1 of the compressor, the average pipe temperature TG1 of the condenser and the average operating current I1 of the compressor in T2 time before the first electronic expansion valve is closed are detected.
Preferably, the step of detecting whether the operation of the air conditioner satisfies a preset condition includes:
after the first electronic expansion valve is closed, controlling the compressor to continuously operate for t2 time;
acquiring the discharge temperature T2 of the compressor, the pipe temperature TG2 of the condenser and the running current I2 of the compressor after the first electronic expansion valve is closed;
detecting whether the operation of the air conditioner meets at least one of the following conditions:
T2-T1 < △ Ta and no further decrease in exhaust gas temperature is detected for a continuous time of T4;
TG1-TG2 is more than or equal to △ Tb, and TG2-TH is detected to be less than or equal to △ Tc continuously at t5 time;
and
in the case that the compressor frequency variation is less than b, I2/I1 < a% is detected for t 6;
where △ Ta, △ Tb, and △ Tc represent constant values, a is a constant value, and TH is the outdoor side ambient temperature.
Preferably, the step of detecting whether the operation of the air conditioner satisfies a preset condition includes:
detecting the duration of the air conditioner operation refrigerant recovery mode;
and if the duration time t is more than t3, judging that the air conditioner finishes the refrigerant recovery.
Preferably, the refrigerant recovery control method further includes:
after the first electric control valve is closed, closing the compressor and the fan load;
an alarm is given by an alarm.
Preferably, the step of issuing an alarm by the alarm comprises:
and displaying a corresponding code through a display panel of the indoor unit or giving an alarm through a buzzer to inform a user of finishing the refrigerant recovery.
Preferably, the refrigerant recovery control method further includes: the first and second shut-off valves are closed.
The invention provides an air conditioner, which comprises a compressor, an outdoor heat exchanger, a first electronic expansion valve, a first stop valve, an indoor heat exchanger, a second stop valve and a first electric control valve, wherein the first electronic expansion valve is arranged between the first stop valve and the outdoor heat exchanger, and the first electric control valve is arranged between the second stop valve and the compressor. This air conditioner has increased first automatically controlled valve between compressor and second stop valve, can cooperate with the first electronic expansion valve that originally had in the air conditioner, realize the automatic control to the air conditioner refrigerant recovery, in the whole in-process of refrigerant recovery, only need first electronic expansion valve of remote control and first automatically controlled valve, just can accomplish the recovery operation of refrigerant, whole process is simple and convenient, need not artifical manual operation, only need carry out electrical control through controller etc., can realize the automatic recovery of refrigerant, the complex operation degree has been reduced, the work load has been reduced, the refrigerant recovery efficiency has been improved.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air conditioner according to a second embodiment of the present invention;
fig. 3 is a flow chart of a refrigerant recovery control method of an air conditioner according to an embodiment of the present invention.
The reference numerals are represented as:
1. a compressor; 2. an outdoor heat exchanger; 3. a first electronic expansion valve; 4. a first shut-off valve; 5. an indoor heat exchanger; 6. a second stop valve; 7. a four-way valve; 8. a second electronic expansion valve; 9. an electromagnetic two-way valve.
Detailed Description
Referring to fig. 1 and 2 in combination, according to an embodiment of the present invention, an air conditioner includes a compressor 1, an outdoor heat exchanger 2, a first electronic expansion valve 3, a first cutoff valve 4, an indoor heat exchanger 5, a second cutoff valve 6, and a first electronic control valve, the first electronic expansion valve 3 being disposed between the first cutoff valve 4 and the outdoor heat exchanger 2, and the first electronic control valve being disposed between the second cutoff valve 6 and the compressor 1.
This air conditioner has increased first automatically controlled valve between compressor 1 and second stop valve, can cooperate with the first electronic expansion valve 3 that originally had in the air conditioner, realize the automatic control to the air conditioner refrigerant recovery, in the whole in-process of refrigerant recovery, only need first electronic expansion valve 3 of remote control and first automatically controlled valve, just can accomplish the recovery operation of refrigerant, whole process is simple and convenient, need not artifical manual operation, only need carry out electrical control through controller etc. only, can realize the automatic recovery of refrigerant, the complex operation degree has been reduced, the work load is reduced, the refrigerant recovery efficiency has been improved.
The air conditioner also comprises a four-way valve 7, the four-way valve 7 is connected with the compressor 1, and the first electric control valve is arranged between the second stop valve 6 and the four-way valve 7. Through setting up cross valve 7, can conveniently realize the switching of air conditioner refrigeration and heating function.
The air conditioner also comprises an alarm which is used for giving an alarm after the air conditioner reaches the refrigerant recovery completion condition. After the air conditioner operates in the refrigerant recovery mode, when the air conditioner is detected to finish the refrigerant recovery operation, an alarm can be timely sent out through the alarm to inform a user that the refrigerant recovery operation is finished, so that the user can conveniently carry out the next operation. In this embodiment, the alarm generated by the alarm device may be represented as an image or a sound, for example, a display panel of the indoor unit displays a corresponding code, or a buzzer or the like generates an alarm sound to remind the user of the completion of refrigerant recovery.
The first electric control valve is a second electronic expansion valve 8 or an electromagnetic two-way valve 9. The first electric control valve can also be an electric control valve which can control the on-off of the pipeline in other forms, as long as the first electric control valve can be directly remotely controlled by a controller and the like without manual operation of a user.
Referring to fig. 3, according to an embodiment of the present invention, the method for controlling refrigerant recycling of an air conditioner includes: controlling the air conditioner to start a refrigerant recovery mode; controlling the air conditioner to run in a refrigeration mode; controlling the first electronic expansion valve 3 to be closed and controlling the first electronic control valve to be opened; detecting whether the operation of the air conditioner meets a preset condition or not; and when the preset condition is met, judging that the air conditioner finishes fluorine collection, and controlling the first electric control valve to be closed.
Through foretell control mode, can realize the recovery operation to the refrigerant through first electronic expansion valve 3 and first automatically controlled valve, because first electronic expansion valve 3 and first automatically controlled valve are all automatically controlled, consequently can carry out the remote control through controller or remote control board etc. need not the manual work and operate, also need not the indoor outdoor round trip of user and run and operate, consequently the operating method is simple and convenient more, labour saving and time saving, refrigerant recovery efficiency is higher, be convenient for realize the automatic control that the refrigerant was retrieved.
In addition, the control method directly utilizes the original first electronic expansion valve 3 in the system, and an electric control valve is additionally arranged to realize the recovery operation of the refrigerant, so that the improvement cost is low, and the original function of the air conditioner is not influenced, thereby having good applicability.
The step of controlling the air conditioner to operate the cooling mode includes: detecting the indoor environment temperature; comparing the indoor environment temperature with the lower limit temperature of the air conditioner operation refrigeration; and if the indoor environment temperature is lower than the lower limit temperature of the air conditioner for operation refrigeration, the air conditioner is forced to start a refrigeration mode.
Generally, most air conditioners in the market have a refrigeration set temperature of 16-30 ℃, and when the indoor environment temperature is lower than 16 ℃, the air conditioner cannot start a refrigeration mode, and cannot smoothly complete the recovery operation of a refrigerant. This application has added the forced refrigeration mode in the air conditioner, when the room ambient temperature is less than the lower limit value of air conditioner refrigeration settlement temperature, directly forces air conditioner operation refrigeration mode to can accomplish the refrigerant smoothly and retrieve the operation under the condition that the room ambient temperature is less than the lower limit value of air conditioner refrigeration settlement temperature.
The step of controlling the closing of the first electronic expansion valve 3 comprises: after the air conditioner operates in the cooling mode T1 or operates to the set frequency P0, the first electronic expansion valve 3 is adjusted to the fully closed state, and the average discharge temperature T1 of the compressor, the average pipe temperature TG1 of the condenser and the average operating current I1 of the compressor in the time T2 before the first electronic expansion valve 3 is closed are detected. After the air conditioner operates in the cooling mode, the air conditioner needs to operate for t1 time or to a set frequency P0 to stably operate the air conditioner, and then the first electronic expansion valve 3 is adjusted to be in a fully closed state, so that the refrigerant flows to the outdoor heat exchanger 2 and is stored in the outdoor heat exchanger 2 to be recovered.
The step of detecting whether the operation of the air conditioner meets the preset condition comprises the following steps: after the first electronic expansion valve 3 is closed, controlling the compressor 1 to continuously operate for t2 time; acquiring the discharge temperature T2 of the compressor and the running current I2 of the compressor after the first electronic expansion valve 3 is closed; detecting whether the operation of the air conditioner meets at least one of the following conditions:
T2-T1 < △ Ta and no further decrease in exhaust gas temperature is detected for a continuous time of T4;
TG1-TG2 is more than or equal to △ Tb, and TG2-TH is detected to be less than or equal to △ Tc continuously at t5 time;
and
in the case that the compressor frequency variation is less than b, I2/I1 < a% is detected for t 6;
where △ Ta, △ Tb and △ Tc represent constant values, a is a constant value, and TH is the outdoor side ambient temperature.
T1 is 3min or more, P0 is 50Hz, t2 is 3s, △ Ta is 3 ℃, t4 is 5s, △ Tb is 1 ℃, t5 is 5s, △ Tc is 1 ℃, b is 2Hz, a is 50, and t6 is 3 s.
When the T2-T1 < △ Ta and the exhaust temperature is not reduced any more continuously detected in the time of T4, after the first electronic expansion valve 3 is closed, the exhaust temperature is rapidly reduced, and the exhaust temperature is increased back to the motor because no refrigerant radiates heat after the refrigerant is recovered, therefore, when the T2-T1 < △ Ta and the exhaust temperature is not reduced any more continuously detected in the time of T4, the fluctuation of the exhaust temperature after the first electronic expansion valve 3 is small, the refrigerant recovery degree is high, and therefore the refrigerant can be considered to be basically recovered.
When the first electronic expansion valve 3 is closed, the pipe temperature is reduced, and the refrigerant is completely recovered, the pipe temperature is close to the ring temperature, so that when TG1-TG2 is more than or equal to △ Tb and TG2-TH is less than or equal to △ Tc continuously detected in t5 time, the refrigerant can be considered to be basically recovered.
After the first electronic expansion valve 3 is closed, the power is gradually reduced, and experiments show that the power is more than 40% of the power before the refrigerant is received when the refrigerant is completely received under normal conditions, so if I2/I1 < a% can be detected continuously for t6 under the condition that the frequency change of the compressor is less than b, the refrigerant can be basically recovered.
Since there is a large difference between the air conditioner operating state during the refrigerant recovery process and the air conditioner operating state after the refrigerant recovery is completed, whether the air conditioner completes the refrigerant recovery operation can be conveniently judged by comparing various operating states of the air conditioner for a period of time before and after the first electronic expansion valve 3 is closed.
The preset conditions may only satisfy one of the conditions, or may satisfy two, three, or four of the conditions. The more the conditions are met, the more accurate the judgment structure is, the less the possibility of error judgment is, and the more accurate the judgment that the air conditioner completes the refrigerant recovery operation can be realized.
The step of detecting whether the operation of the air conditioner meets the preset condition comprises the following steps: detecting the duration of the air conditioner operation refrigerant recovery mode; and if the duration time t is more than t3, judging that the air conditioner finishes the refrigerant recovery. t3 is, for example, 1 min.
When the lasting time t of the air conditioner operation refrigerant recovery mode exceeds t3, the compressor can generally finish over 95% of the refrigerant, and therefore whether one of the four conditions is met or not, the air conditioner can be judged to finish the refrigerant recovery operation according to the lasting time t, the compressor is prevented from being damaged due to the fact that the compressor is unloaded for a long time due to overlong refrigerant recovery time, loss prevention protection is formed on the compressor, and safety and reliability of the compressor in operation are improved.
The refrigerant recovery control method further comprises the following steps: after the first electric control valve is closed, the compressor 1 and the fan load are closed; an alarm is given by an alarm.
The step of issuing an alarm by the alarm includes: and displaying a corresponding code through a display panel of the indoor unit or giving an alarm through a buzzer to inform a user of finishing the refrigerant recovery. After the air conditioner operates in the refrigerant recovery mode, when the air conditioner is detected to finish the refrigerant recovery operation, an alarm can be timely sent out through the alarm to inform a user that the refrigerant recovery operation is finished, so that the user can conveniently carry out the next operation.
The refrigerant recovery control method further comprises the following steps: the first and second cutoff valves 4 and 6 are closed. After the step is executed, the refrigerant recovery operation of the whole air conditioner is completely finished.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (6)
1. The air conditioner comprises a compressor (1), an outdoor heat exchanger (2), a first electronic expansion valve (3), a first stop valve (4), an indoor heat exchanger (5), a second stop valve (6) and a first electric control valve, wherein the first electronic expansion valve (3) is arranged between the first stop valve (4) and the outdoor heat exchanger (2), and the first electric control valve is arranged between the second stop valve (6) and the compressor (1), and the refrigerant recovery control method is characterized by comprising the following steps:
controlling the air conditioner to start a refrigerant recovery mode;
controlling the air conditioner to run in a refrigeration mode;
controlling the first electronic expansion valve (3) to be closed and controlling the first electronic control valve to be opened;
detecting whether the operation of the air conditioner meets a preset condition or not;
when the preset condition is met, judging that the air conditioner finishes fluorine collection, and controlling the first electric control valve to be closed;
the step of controlling the closing of the first electronic expansion valve (3) comprises:
after the air conditioner operates in the cooling mode t1 or the set frequency P0,
adjusting the first electronic expansion valve (3) to a full-closed state, and simultaneously detecting the average exhaust temperature T1 of the compressor, the average pipe temperature TG1 of the condenser and the average running current I1 of the compressor in T2 time before the first electronic expansion valve (3) is closed;
the step of detecting whether the operation of the air conditioner meets the preset condition comprises the following steps:
after the first electronic expansion valve (3) is closed, controlling the compressor (1) to continuously operate for t2 time;
acquiring the compressor exhaust temperature T2, the condenser pipe temperature TG2 and the compressor running current I2 after the first electronic expansion valve (3) is closed;
detecting whether the operation of the air conditioner meets at least one of the following conditions:
T2-T1 < △ Ta and no further decrease in exhaust gas temperature is detected for a continuous time of T4;
TG1-TG2 is more than or equal to △ Tb, and TG2-TH is detected to be less than or equal to △ Tc continuously at t5 time;
and
in the case that the compressor frequency variation is less than b, I2/I1 < a% is detected for t 6;
where △ Ta, △ Tb, and △ Tc represent constant values, a is a constant value, and b is a compressor variation frequency value TH is an outdoor side ambient temperature.
2. The refrigerant recovery control method according to claim 1, wherein the step of controlling the air conditioner to operate in a cooling mode includes:
detecting the indoor environment temperature;
comparing the indoor environment temperature with the lower limit temperature of the air conditioner operation refrigeration;
and if the indoor environment temperature is lower than the lower limit temperature of the air conditioner for operation refrigeration, the air conditioner is forced to start a refrigeration mode.
3. The refrigerant recovery control method according to claim 1, wherein the step of detecting whether the operation of the air conditioner satisfies a preset condition comprises:
detecting the duration of the air conditioner operation refrigerant recovery mode;
and if the duration time t is more than t3, judging that the air conditioner finishes the refrigerant recovery.
4. The refrigerant recovery control method according to claim 1, further comprising:
after the first electric control valve is closed, the compressor (1) and the fan load are closed;
an alarm is given by an alarm.
5. The refrigerant recovery control method according to claim 4, wherein the step of issuing an alarm by an alarm includes:
and displaying a corresponding code through a display panel of the indoor unit or giving an alarm through a buzzer to inform a user of finishing the refrigerant recovery.
6. The refrigerant recovery control method according to claim 4, further comprising:
the first shut-off valve (4) and the second shut-off valve (6) are closed.
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| CN110454905B (en) * | 2019-08-05 | 2022-03-25 | 广东美的制冷设备有限公司 | Control method and device of air conditioner, air conditioner and electronic equipment |
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| CN111207504A (en) * | 2020-01-13 | 2020-05-29 | 珠海格力电器股份有限公司 | Air conditioning system and refrigerant recovery control method |
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| CN115264811A (en) * | 2022-06-21 | 2022-11-01 | 青岛海尔空调器有限总公司 | Air conditioner refrigerant recovery method and device, air conditioner, medium and program product |
| CN114963299B (en) * | 2022-06-30 | 2023-11-03 | 海信空调有限公司 | Air conditioner |
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| CN104019525A (en) * | 2014-06-24 | 2014-09-03 | 广东美的暖通设备有限公司 | Recycling method and recycling system for air conditioner coolant |
| CN105180498A (en) * | 2015-09-02 | 2015-12-23 | 广东美的制冷设备有限公司 | Floor-type split air conditioner, refrigerant recovering method and device |
| CN105698284A (en) * | 2016-03-14 | 2016-06-22 | 广东美的制冷设备有限公司 | Air-conditioning system and refrigeration controlling method and device thereof |
| CN106595149A (en) * | 2016-11-22 | 2017-04-26 | 珠海格力电器股份有限公司 | Refrigerant recovery method and device of air conditioner |
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