CN112197455B - Air conditioning unit capable of recycling refrigerant and control method thereof - Google Patents
Air conditioning unit capable of recycling refrigerant and control method thereof Download PDFInfo
- Publication number
- CN112197455B CN112197455B CN202011111913.2A CN202011111913A CN112197455B CN 112197455 B CN112197455 B CN 112197455B CN 202011111913 A CN202011111913 A CN 202011111913A CN 112197455 B CN112197455 B CN 112197455B
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 198
- 238000004378 air conditioning Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004064 recycling Methods 0.000 title abstract description 5
- 238000011084 recovery Methods 0.000 claims abstract description 66
- 239000007788 liquid Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 18
- 238000001816 cooling Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- 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
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/001—Charging refrigerant to a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/002—Collecting refrigerant from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/004—Details for charging or discharging refrigerants; Service stations therefor with several tanks to collect or charge a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves
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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)
Abstract
The invention discloses an air conditioning unit capable of recycling refrigerant and a control method thereof, wherein the air conditioning unit comprises: the device comprises a compressor, a four-way valve, a condenser and an evaporator; the first port of the four-way valve is connected with the air suction port of the compressor, the second port of the four-way valve is connected with the air exhaust port of the compressor, the third port of the four-way valve is connected with the first port of the condenser, and the second port of the four-way valve is connected with the first port of the evaporator; and the refrigerant recovery device is positioned between the exhaust port of the compressor and the second port of the four-way valve and is used for storing the refrigerant recovered from the condenser when the refrigerant is recovered. The invention solves the problems of the prior art that the refrigerant is required to be discharged when the unit is maintained or the unit is stopped for a long time, and the cost is higher, reduces the maintenance cost of the whole machine and improves the stability of the unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner unit capable of recycling refrigerants and a control method thereof.
Background
For the large screw unit, because in the actual use process, a refrigerant recovery device is not arranged, when a pipeline is required to be disassembled if faults occur, the refrigerant of hundreds of kilograms in the system can be completely discharged for maintenance, and the refrigerant is refilled after the maintenance is completed, so that the cost and the maintenance cost of the refrigerant are greatly increased. Although most units use R134a refrigerant, the refrigerant still decomposes out toxic and harmful gases to pollute the environment and human health.
In addition, when the unit is placed outdoors for a long time (not operated in winter), the condenser storing the refrigerant is easy to break, and the reliability of the unit is affected. Therefore, in this case, too, it is necessary to drain the refrigerant to prevent the condenser from being damaged.
Aiming at the problems that in the related art, when the unit is maintained or the unit is stopped for a long time, the refrigerant is required to be discharged, and the cost is high, no effective solution is proposed at present.
Disclosure of Invention
The invention provides an air conditioning unit capable of recycling refrigerants and a control method thereof, which at least solve the problems that the refrigerants are required to be discharged when the unit is maintained or the unit is stopped for a long time in the prior art, and the cost is high.
To solve the above technical problem, according to an aspect of the embodiments of the present invention, there is provided an air conditioning unit, including: the device comprises a compressor, a four-way valve, a condenser and an evaporator; the first port of the four-way valve is connected with the air suction port of the compressor, the second port of the four-way valve is connected with the air exhaust port of the compressor, the third port of the four-way valve is connected with the first port of the condenser, and the second port of the four-way valve is connected with the first port of the evaporator; and the refrigerant recovery device is positioned between the exhaust port of the compressor and the second port of the four-way valve and is used for storing the refrigerant recovered from the condenser when the refrigerant is recovered.
Further, the evaporator is also used for storing the refrigerant recovered from the condenser when recovering the refrigerant.
Further, the method further comprises the following steps: and one end of the refrigerant pump is connected with the air suction port of the compressor, and the other end of the refrigerant pump is connected with the air exhaust port of the compressor and is used for being started when the refrigerant is recovered, and the refrigerant in the condenser is recovered to the refrigerant recovery device and/or the evaporator.
Further, the method further comprises the following steps: the first electromagnetic valve is positioned between the third port of the four-way valve and the first port of the condenser; the one-way valve is arranged in parallel with the first electromagnetic valve; the first electromagnetic valve is used for being closed when the refrigerant is recovered, and the refrigerant in the condenser enters the refrigerant recovery device and/or the evaporator through the one-way valve.
Further, the method further comprises the following steps: and the second electromagnetic valve is positioned between the second port of the condenser and the second port of the evaporator and is used for being closed when the refrigerant is recovered, so that the refrigerant in the evaporator is prevented from flowing backwards to the condenser.
Further, the second electromagnetic valve is also used for being opened when the air conditioning unit is started, and meanwhile, the first electromagnetic valve is closed, and the refrigerant pump is opened, so that the refrigerant in the refrigerant recovery device and/or the evaporator flows back to the condenser through the second electromagnetic valve.
Further, the method further comprises the following steps: a filter drier located between the second port of the condenser and the second port of the evaporator; a third solenoid valve positioned between the filter drier and the second port of the condenser; a fourth solenoid valve positioned between the filter drier and the second port of the evaporator; the third solenoid valve and the fourth solenoid valve are closed when the filter drier is replaced, so that the filter drier is replaced.
According to another aspect of the embodiment of the present invention, there is provided an air conditioning unit control method, applied to an air conditioning unit as described above, including: detecting whether the air conditioning unit meets the refrigerant recovery condition; if yes, the first electromagnetic valve and the second electromagnetic valve are controlled to be closed, and the refrigerant pump is controlled to be opened, so that the refrigerant in the condenser is recovered to the refrigerant recovery device and/or the evaporator.
Further, the refrigerant recovery conditions include at least one of: and disassembling and maintaining the air conditioning unit and standing by with low load of the air conditioning unit.
Further, when the refrigerant recovery condition includes low-load standby of the air conditioning unit, detecting whether the air conditioning unit meets the refrigerant recovery condition includes: detecting the ambient temperature T of an air conditioning unit h The method comprises the steps of carrying out a first treatment on the surface of the Calculating the running load Q of the air conditioning unit; when the ambient temperature T is less than the preset refrigerant recovery temperature Ts and the running load Q is less than or equal to the preset low load threshold value Qs, determining that the air conditioning unit meets the refrigerant recovery condition.
Further, calculating an operation load Q of the air conditioning unit includes: calculating a nominal current value A1 of the compressor at a first load value Q1 and a nominal current value A2 of the compressor at a second load value Q2; detecting a real-time current value A of the compressor; determining the running load Q of the air conditioning unit according to the A1, the A2 and the real-time current value A; wherein, q= (Q1-Q2) × (k×a-A2)/(A1-A2) +q2, k is a coefficient.
Further, q1=100%, and the nominal current value A1 of the compressor at the time of calculating the first load value Q1 includes: detecting the outlet temperature T of chilled waterc and evaporation temperature To; a1 is calculated by the following formula:wherein a, b, c, d is a coefficient.
Further, q2=50%, and the nominal current value A2 of the compressor at the time of calculating the second load value Q2 includes: detecting the outlet water temperature Tc of chilled water; a2 is calculated by the following formula:wherein a, b and c are coefficients.
Further, after the refrigerant pump is started, the method further comprises: after a first preset time, detecting the pressure P at the liquid pipe of the condenser Liquid and its preparation method Whether the hydraulic pressure is smaller than or equal to a preset hydraulic pressure; if yes, closing the refrigerant pump; otherwise, re-detecting the pressure P at the liquid pipe of the condenser after a second preset time interval Liquid and its preparation method 。
Further, the method further comprises the following steps: monitoring whether to trigger the starting operation of the air conditioning unit; if yes, the second electromagnetic valve is controlled to be opened, the first electromagnetic valve is closed, and the refrigerant pump is opened, so that the refrigerant in the refrigerant recovery device and/or the evaporator flows back to the condenser through the second electromagnetic valve.
According to yet another aspect of embodiments of the present invention, there is provided a storage medium containing computer executable instructions for performing an air conditioning unit control method as described above when executed by a computer processor.
In the present invention, a refrigerant recovery device is provided between the exhaust port of the compressor and the second port of the four-way valve, for storing the refrigerant recovered from the condenser when recovering the refrigerant. When the unit normally operates, a refrigerant recovery mechanism is not started, and when the single-cooling unit needs to be placed for a long time, the refrigerant is recovered by the refrigerant recovery device, and the standby unit needs to be restarted and discharged. Meanwhile, when the unit is in fault and needs to be maintained, the refrigerant recovery device is also used, and after the refrigerant is recovered, the pipeline is disassembled for maintenance. Through the device, the problems that the refrigerant needs to be discharged when the unit is maintained or the unit is stopped for a long time and the cost is high are effectively solved, the reliability of the unit is not reduced, the maintenance cost of the whole unit is reduced, the maintenance can be performed without discharging the refrigerant, and meanwhile, the stability of the unit is improved.
Drawings
FIG. 1 is a schematic view of an alternative configuration of an air conditioning unit according to an embodiment of the present invention;
FIG. 2 is a schematic view of an alternative construction of an air conditioning unit in a heating mode according to an embodiment of the present invention;
FIG. 3 is a schematic view of an alternative configuration of an air conditioning unit in a cooling mode according to an embodiment of the present invention; and
fig. 4 is an alternative flowchart of an air conditioner control method according to an embodiment of the present invention.
Reference numerals illustrate:
1. a compressor; 2. a four-way valve; 3. a condenser; 4. an evaporator; 5. a refrigerant recovery device; 6. a refrigerant pump; 7. a first electromagnetic valve; 8. a one-way valve; 9. a second electromagnetic valve; 10. drying the filter; 11. a third electromagnetic valve; 12. a fourth electromagnetic valve; 13. and a fifth electromagnetic valve.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
Example 1
In a preferred embodiment 1 of the present invention, an air conditioning unit is provided, and in particular, fig. 1 shows an alternative structural schematic diagram of the unit, as shown in fig. 1, the unit includes:
a compressor 1, a four-way valve 2, a condenser 3 and an evaporator 4; the first port of the four-way valve 2 is connected with the air suction port of the compressor 1, the second port of the four-way valve 2 is connected with the air discharge port of the compressor 1, the third port of the four-way valve 2 is connected with the first port of the condenser 3, and the second port of the four-way valve 2 is connected with the first port of the evaporator 4;
and a refrigerant recovery device 5, which is located between the exhaust port of the compressor 1 and the second port of the four-way valve 2, and is used for storing the refrigerant recovered from the condenser 3 when recovering the refrigerant.
In the above embodiment, a refrigerant recovery device is provided between the exhaust port of the compressor and the second port of the four-way valve, for storing the refrigerant recovered from the condenser when recovering the refrigerant. When the unit normally operates, a refrigerant recovery mechanism is not started, and when the single-cooling unit needs to be placed for a long time, the refrigerant is recovered by the refrigerant recovery device, and the standby unit needs to be restarted and discharged. Meanwhile, when the unit is in fault and needs to be maintained, the refrigerant recovery device is also used, and after the refrigerant is recovered, the pipeline is disassembled for maintenance. Through the device, the problems that the refrigerant needs to be discharged when the unit is maintained or the unit is stopped for a long time and the cost is high are effectively solved, the reliability of the unit is not reduced, the maintenance cost of the whole unit is reduced, the maintenance can be performed without discharging the refrigerant, and meanwhile, the stability of the unit is improved.
In the above embodiment, the evaporator 4 is preferably a flooded evaporator, and the evaporator 4 is also configured to store the refrigerant recovered from the condenser 3 when recovering the refrigerant.
Meanwhile, the unit further comprises a refrigerant pump 6, one end of the refrigerant pump is connected with the air suction port of the compressor 1, the other end of the refrigerant pump is connected with the air discharge port of the compressor 1 and used for being started when the refrigerant is recovered, and the refrigerant in the condenser 3 is recovered to the refrigerant recovery device 5 and/or the evaporator 4. The refrigerant pump 6 accelerates the flow of the refrigerant, thereby accelerating the recovery of the refrigerant. The fluid flow direction of the refrigerant pump 6 is matched with the operation mode of the unit, specifically, when the refrigerant is recovered, if the unit is in a heating mode, the fluid flow direction of the refrigerant pump 6 is from left to right, and if the unit is in a cooling mode, the fluid flow direction of the refrigerant pump 6 is from right to left, so as to realize that the refrigerant recovered by the condenser 3 flows into the refrigerant recovery device 5 and/or the evaporator 4.
Between the third port of the four-way valve 2 and the first port of the condenser 3, further comprising: a first electromagnetic valve 7, a one-way valve 8, and a second electromagnetic valve 7 arranged in parallel; the first electromagnetic valve 7 is used for being closed when the refrigerant is recovered, and the refrigerant in the condenser 3 enters the refrigerant recovery device 5 and/or the evaporator 4 through the one-way valve 8.
Between the second port of the condenser 3 and the second port of the evaporator 4, further comprising: the second electromagnetic valve 9 is closed when the refrigerant is recovered, and prevents the refrigerant in the evaporator 4 from flowing backward to the condenser 3.
In addition, the second electromagnetic valve 9 is also used for being opened when the air conditioning unit is started, meanwhile, the first electromagnetic valve 7 is closed, and the refrigerant pump 6 is opened, so that the refrigerant in the refrigerant recovery device 5 and/or the evaporator 4 flows back to the condenser 3 through the second electromagnetic valve 9. When the unit is in use, the recovered refrigerant needs to be returned to the condenser 3, and therefore the refrigerant pump 6 and the second electromagnetic valve 9 need to be turned on.
The whole system is additionally provided with a drier-filter 10 for removing moisture in the circulation line. The drier-filter 10 is located between the second port of the condenser 3 and the second port of the evaporator 4; a third solenoid valve 11 located between the filter drier 10 and the second port of the condenser 3; a fourth solenoid valve 12 located between the filter drier 10 and the second port of the evaporator 4; the third solenoid valve 11 and the fourth solenoid valve 12 are closed when the filter drier 10 is replaced, so that the filter drier 10 is replaced. The fifth solenoid valve 13 is a throttle device in four major components of the air conditioner.
In the invention, the cold recovery is generally the disassembly maintenance of the air conditioning unit or the low-load standby of the air conditioning unit. The low-load standby of the air conditioning unit refers to the standby of the air conditioning unit in a heating mode, and the disassembly and maintenance of the air conditioning unit can happen in a cooling or heating mode.
In view of this, in the preferred embodiment 1 of the present invention, there is also provided a schematic refrigerant recovery diagram of an air conditioning unit in a heating mode, as shown in fig. 2, in which the first electromagnetic valve 7 is closed, the second electromagnetic valve 9 is closed, the refrigerant pump 6 is opened and operated, and at this time, the circulation path of the whole unit is: condenser 3-check valve 8-refrigerant pump 6-refrigerant return device-four-way valve 2-evaporator 4. All the refrigerant in the condenser 3 is forced to migrate into the refrigerant recovery device 5 and/or the evaporator 4 by the refrigerant pump 6 in a low-frequency low-capacity state. At this time, because the check valve 8 is present and the second electromagnetic valve 9 is closed, the refrigerant in the system cannot migrate the refrigerant in the evaporator 4 to the condenser 3 under the action of the refrigerant pump 6.
In the preferred embodiment 1 of the present invention, a schematic refrigerant recovery diagram of the air conditioning unit under heating and cooling is further provided, as shown in fig. 3, the first electromagnetic valve 7 is closed, the second electromagnetic valve 9 is closed, the refrigerant pump 6 is opened and operated, and at this time, the circulation path of the whole unit is: condenser 3-check valve 8-refrigerant return device-refrigerant pump 6-four-way valve 2-evaporator 4. All the refrigerant in the condenser 3 is forced to migrate into the refrigerant recovery device 5 and/or the evaporator 4 by the refrigerant pump 6 in a low-frequency low-capacity state. At this time, because the check valve 8 is present and the second electromagnetic valve 9 is closed, the refrigerant in the system cannot migrate the refrigerant in the evaporator 4 to the condenser 3 under the action of the refrigerant pump 6.
When the unit normally operates and needs to transfer the refrigerant back to the condenser 3, the first electromagnetic valve 7 is closed, the second electromagnetic valve 9 is opened, the refrigerant pump 6 is opened, and the refrigerant in the refrigerant recovery device 5 and/or the evaporator 4 enters the condenser 3 through the second electromagnetic valve 9.
Example 2
In a preferred embodiment 2 of the present invention, there is provided an air conditioning unit control method applied to the air conditioning unit in the above embodiment 1. Specifically, fig. 2 shows an alternative flow chart of the method, as shown in fig. 4, comprising the following steps S402-S404:
s402: detecting whether the air conditioning unit meets the refrigerant recovery condition;
s404: if yes, the first electromagnetic valve and the second electromagnetic valve are controlled to be closed, and the refrigerant pump is controlled to be opened, so that the refrigerant in the condenser is recovered to the refrigerant recovery device and/or the evaporator.
In the above embodiment, a refrigerant recovery device is provided between the exhaust port of the compressor and the second port of the four-way valve, for storing the refrigerant recovered from the condenser when recovering the refrigerant. When the unit normally operates, a refrigerant recovery mechanism is not started, and when the single-cooling unit needs to be placed for a long time, the refrigerant is recovered by the refrigerant recovery device, and the standby unit needs to be restarted and discharged. Meanwhile, when the unit is in fault and needs to be maintained, the refrigerant recovery device is also used, and after the refrigerant is recovered, the pipeline is disassembled for maintenance. Through the device, the problems that the refrigerant needs to be discharged when the unit is maintained or the unit is stopped for a long time and the cost is high are effectively solved, the reliability of the unit is not reduced, the maintenance cost of the whole unit is reduced, the maintenance can be performed without discharging the refrigerant, and meanwhile, the stability of the unit is improved.
In the present invention, the refrigerant recovery conditions include at least one of the following: and disassembling and maintaining the air conditioning unit and standing by with low load of the air conditioning unit.
When the refrigerant recovery condition includes low-load standby of the air conditioning unit, detecting whether the air conditioning unit meets the refrigerant recovery condition or not, including: detecting the ambient temperature T of an air conditioning unit h The method comprises the steps of carrying out a first treatment on the surface of the Calculating the running load Q of the air conditioning unit; when the ambient temperature T is less than the preset refrigerant recovery temperature Ts and the running load Q is less than or equal to the preset low load threshold value Qs, determining that the air conditioning unit meets the refrigerant recovery condition. The unit is in the low temperature operating mode and easily causes pipeline and condenser to break or damage, consequently need carry out refrigerant recovery.
Wherein, calculate the operation load Q of air conditioning unit, include: calculating a nominal current value A1 of the compressor at a first load value Q1 and a nominal current value A2 of the compressor at a second load value Q2; detecting a real-time current value A of the compressor; determining the running load Q of the air conditioning unit according to the A1, the A2 and the real-time current value A; wherein, q= (Q1-Q2) × (k×a-A2)/(A1-A2) +q2, k is a coefficient.
Q1=100%, and calculating a nominal current value A1 of the compressor at the first load value Q1 includes: detecting the outlet water temperature Tc and the evaporation temperature To of chilled water; a1 is calculated by the following formula:wherein a, b, c, d is a coefficient.
Q2=50%, and calculating a nominal current value A2 of the compressor at the second load value Q2 includes: detecting the outlet water temperature Tc of chilled water; a2 is calculated by the following formula:wherein a, b and c are coefficients.
After the refrigerant pump is started, in order to detect the refrigerant recovery condition, the method further comprises: after a first preset time, detecting the pressure P at the liquid pipe of the condenser Liquid and its preparation method Whether the hydraulic pressure is smaller than or equal to a preset hydraulic pressure; if yes, closing the refrigerant pump; otherwise, re-detecting the pressure P at the liquid pipe of the condenser after a second preset time interval Liquid and its preparation method . Monitoring the pressure P at the liquid pipe of the condenser in real time Liquid and its preparation method So as to close the refrigerant pump in time when the recovery is completed.
Meanwhile, the invention also comprises the following steps: monitoring whether to trigger the starting operation of the air conditioning unit; if yes, the second electromagnetic valve is controlled to be opened, the first electromagnetic valve is closed, and the refrigerant pump is opened, so that the refrigerant in the refrigerant recovery device and/or the evaporator flows back to the condenser through the second electromagnetic valve.
Example 3
Based on the air conditioning unit control method provided in the above embodiment 2, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.
In the above embodiment, a refrigerant recovery device is provided between the exhaust port of the compressor and the second port of the four-way valve, for storing the refrigerant recovered from the condenser when recovering the refrigerant. When the unit normally operates, a refrigerant recovery mechanism is not started, and when the single-cooling unit needs to be placed for a long time, the refrigerant is recovered by the refrigerant recovery device, and the standby unit needs to be restarted and discharged. Meanwhile, when the unit is in fault and needs to be maintained, the refrigerant recovery device is also used, and after the refrigerant is recovered, the pipeline is disassembled for maintenance. Through the device, the problems that the refrigerant needs to be discharged when the unit is maintained or the unit is stopped for a long time and the cost is high are effectively solved, the reliability of the unit is not reduced, the maintenance cost of the whole unit is reduced, the maintenance can be performed without discharging the refrigerant, and meanwhile, the stability of the unit is improved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (16)
1. An air conditioning unit, comprising:
a compressor (1), a four-way valve (2), a condenser (3) and an evaporator (4); the first port of the four-way valve (2) is connected with the air suction port of the compressor (1), the second port of the four-way valve (2) is connected with the air discharge port of the compressor (1), the third port of the four-way valve (2) is connected with the first port of the condenser (3), and the second port of the four-way valve (2) is connected with the first port of the evaporator (4);
and a refrigerant recovery device (5) located between the exhaust port of the compressor (1) and the second port of the four-way valve (2) for storing the refrigerant recovered from the condenser (3) when recovering the refrigerant.
2. Air conditioning unit according to claim 1, characterized in that the evaporator (4) is also adapted to store the refrigerant recovered from the condenser (3) when recovering the refrigerant.
3. The air conditioning assembly of claim 2, further comprising:
and one end of the refrigerant pump (6) is connected with the air suction port of the compressor (1), and the other end of the refrigerant pump is connected with the air discharge port of the compressor (1) and is used for being started when the refrigerant is recovered, so that the refrigerant in the condenser (3) is recovered to the refrigerant recovery device (5) and/or the evaporator (4).
4. An air conditioning assembly according to claim 3, further comprising:
a first electromagnetic valve (7) positioned between the third port of the four-way valve (2) and the first port of the condenser (3);
a one-way valve (8) which is arranged in parallel with the first electromagnetic valve (7);
the first electromagnetic valve (7) is used for being closed when the refrigerant is recovered, and the refrigerant in the condenser (3) enters the refrigerant recovery device (5) and/or the evaporator (4) through the one-way valve (8).
5. The air conditioning assembly of claim 4, further comprising:
a second electromagnetic valve (9) is positioned between the second port of the condenser (3) and the second port of the evaporator (4) and is used for being closed when the refrigerant is recovered, so as to prevent the refrigerant in the evaporator (4) from flowing back to the condenser (3).
6. Air conditioning unit according to claim 5, characterized in that the second solenoid valve (9) is also adapted to be opened when the air conditioning unit is started, while the first solenoid valve (7) is closed, and the refrigerant pump (6) is opened, so that the refrigerant in the refrigerant recovery device (5) and/or the evaporator (4) flows back into the condenser (3) through the second solenoid valve (9).
7. The air conditioning assembly of claim 1, further comprising:
-a drier-filter (10) located between the second port of the condenser (3) and the second port of the evaporator (4);
a third solenoid valve (11) located between the filter drier (10) and the second port of the condenser (3);
a fourth solenoid valve (12) located between the filter drier (10) and the second port of the evaporator (4);
the third solenoid valve (11) and the fourth solenoid valve (12) are used to close when the drier-filter (10) is replaced, so that the drier-filter (10) is replaced.
8. An air conditioning unit control method applied to the air conditioning unit according to any one of claims 1 to 7, characterized by comprising:
detecting whether the air conditioning unit meets a refrigerant recovery condition;
if yes, the first electromagnetic valve and the second electromagnetic valve are controlled to be closed, and the refrigerant pump is controlled to be opened, so that the refrigerant in the condenser is recovered to the refrigerant recovery device and/or the evaporator; the first electromagnetic valve is positioned between the third port of the four-way valve and the first port of the condenser; the second electromagnetic valve is positioned between the second port of the condenser and the second port of the evaporator; one end of the refrigerant pump is connected with the air suction port of the compressor, and the other end of the refrigerant pump is connected with the air discharge port of the compressor.
9. The method of claim 8, wherein the refrigerant recovery conditions include at least one of: and disassembling and maintaining the air conditioning unit and standing by with low load of the air conditioning unit.
10. The method of claim 9, wherein when the refrigerant recovery condition includes a low-load standby of the air conditioning unit, the detecting whether the air conditioning unit satisfies the refrigerant recovery condition includes:
detecting the ambient temperature T of the air conditioning unit h ；
Calculating the running load Q of the air conditioning unit;
when the ambient temperature T is less than the preset refrigerant recovery temperature Ts and the running load Q is less than or equal to the preset low load threshold value Qs, determining that the air conditioning unit meets the refrigerant recovery condition.
11. The method of claim 10, wherein calculating the operating load Q of the air conditioning unit comprises:
calculating a nominal current value A1 of the compressor at a first load value Q1 and a nominal current value A2 of the compressor at a second load value Q2;
detecting a real-time current value A of the compressor;
determining the operation load Q of the air conditioning unit according to the A1, the A2 and the real-time current value A; wherein, q= (Q1-Q2) × (k×a-A2)/(A1-A2) +q2, k being a coefficient.
12. The method of claim 11, wherein q1=100%, calculating the nominal current value A1 of the compressor at the first load value Q1 comprises:
detecting the chilled water outlet temperature Tc and the evaporation temperature To;
a1 is calculated by the following formula:* (1+t0×d) a; wherein a, b, c, d is a coefficient.
13. The method of claim 11, wherein calculating the nominal current value A2 of the compressor at the second load value Q2, q2, comprises:
detecting the outlet water temperature Tc of chilled water;
a2 is calculated by the following formula:the method comprises the steps of carrying out a first treatment on the surface of the Wherein a, b and c are coefficients.
14. The method of claim 8, further comprising, after the refrigerant pump is turned on:
after a first preset time, detecting the pressure P at the liquid pipe of the condenser Liquid and its preparation method Whether the hydraulic pressure is smaller than or equal to a preset hydraulic pressure;
if yes, closing the refrigerant pump;
otherwise, re-detecting the pressure P at the liquid pipe of the condenser after a second preset time interval Liquid and its preparation method 。
15. The method as recited in claim 8, further comprising:
monitoring whether to trigger the starting operation of the air conditioning unit;
if yes, the second electromagnetic valve is controlled to be opened, the first electromagnetic valve is closed, and the refrigerant pump is opened, so that the refrigerant in the refrigerant recovery device and/or the evaporator flows back to the condenser through the second electromagnetic valve.
16. A storage medium containing computer executable instructions, which when executed by a computer processor are for performing the air conditioning unit control method of any of claims 8 to 15.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000154953A (en) * | 1998-11-18 | 2000-06-06 | Matsushita Electric Ind Co Ltd | Refrigerant recovery method from waste product |
| JP2002277111A (en) * | 2001-03-19 | 2002-09-25 | Fujitsu General Ltd | Refrigerant recovery unit |
| CN101691963A (en) * | 2009-05-25 | 2010-04-07 | 广东志高空调有限公司 | Recycle system of air-conditioning outdoor machine refrigerant |
| CN106062490A (en) * | 2014-03-07 | 2016-10-26 | 三菱电机株式会社 | Air conditioning apparatus |
| WO2019179452A1 (en) * | 2018-03-21 | 2019-09-26 | 青岛海信日立空调系统有限公司 | Outdoor unit, multi-split system and control method therefor |
| CN110411082A (en) * | 2019-07-23 | 2019-11-05 | 珠海格力电器股份有限公司 | Refrigerant recovery system, control method and device thereof, controller and air conditioning system |
| CN214250186U (en) * | 2020-10-16 | 2021-09-21 | 珠海格力电器股份有限公司 | Air conditioning unit capable of recycling refrigerant |
-
2020
- 2020-10-16 CN CN202011111913.2A patent/CN112197455B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000154953A (en) * | 1998-11-18 | 2000-06-06 | Matsushita Electric Ind Co Ltd | Refrigerant recovery method from waste product |
| JP2002277111A (en) * | 2001-03-19 | 2002-09-25 | Fujitsu General Ltd | Refrigerant recovery unit |
| CN101691963A (en) * | 2009-05-25 | 2010-04-07 | 广东志高空调有限公司 | Recycle system of air-conditioning outdoor machine refrigerant |
| CN106062490A (en) * | 2014-03-07 | 2016-10-26 | 三菱电机株式会社 | Air conditioning apparatus |
| WO2019179452A1 (en) * | 2018-03-21 | 2019-09-26 | 青岛海信日立空调系统有限公司 | Outdoor unit, multi-split system and control method therefor |
| CN110411082A (en) * | 2019-07-23 | 2019-11-05 | 珠海格力电器股份有限公司 | Refrigerant recovery system, control method and device thereof, controller and air conditioning system |
| CN214250186U (en) * | 2020-10-16 | 2021-09-21 | 珠海格力电器股份有限公司 | Air conditioning unit capable of recycling refrigerant |
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