CN113883766A - Control method for frequency conversion air conditioner frequency reduction protection - Google Patents

Control method for frequency conversion air conditioner frequency reduction protection Download PDF

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Publication number
CN113883766A
CN113883766A CN202111352065.9A CN202111352065A CN113883766A CN 113883766 A CN113883766 A CN 113883766A CN 202111352065 A CN202111352065 A CN 202111352065A CN 113883766 A CN113883766 A CN 113883766A
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China
Prior art keywords
compressor
frequency
valve
air conditioner
frequency reduction
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CN202111352065.9A
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CN113883766B (en
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宋茜
濮东
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Wuxi Tongfang Artificial Environment Co Ltd
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Wuxi Tongfang Artificial Environment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to the technical field of variable frequency air conditioners, and particularly discloses a control method for frequency reduction protection of a variable frequency air conditioner, wherein the control method comprises the following steps: acquiring temperature monitoring data in the running process of the air conditioner in real time; judging whether the current compressor needs frequency reduction control or not according to the temperature monitoring data; if so, controlling the electronic expansion valve to adjust the valve closing amplitude according to the frequency reduction speed of the compressor. The control method of the variable frequency air conditioner frequency reduction protection can slow down the frequency reduction speed of the compressor when the temperature is increased and the frequency reduction is needed, reduce the frequency reduction time of the compressor, and can not reduce the performance of an air conditioning system, and compared with the frequency reduction mode in the prior art, the service life of the compressor is prolonged.

Description

Control method for frequency conversion air conditioner frequency reduction protection
Technical Field
The invention relates to the technical field of variable frequency air conditioners, in particular to a control method for frequency reduction protection of a variable frequency air conditioner.
Background
In recent years, with the wider application of the variable frequency air conditioner technology, the control technology of the variable frequency air conditioner is more mature, the control reliability is stronger, and the precision is higher.
However, when the inverter air conditioner works, the inverter air conditioner is easy to protect when the temperature rises, and the compressor needs to be frequently reduced in frequency. The frequent frequency reduction of the compressor can affect the refrigeration or heating effect of the air conditioner and reduce the performance of the air conditioning system, and can also shorten the service life of the compressor.
Disclosure of Invention
The invention provides a control method for frequency-reducing protection of a variable-frequency air conditioner, which solves the problems that the frequency reduction frequently affects the performance of an air conditioning system and shortens the service life of a compressor in the related technology.
As an aspect of the present invention, a method for controlling a down-conversion protection of a variable frequency air conditioner is provided, wherein the method comprises:
acquiring temperature monitoring data in the running process of the air conditioner in real time;
judging whether the current compressor needs frequency reduction control or not according to the temperature monitoring data;
if so, controlling the electronic expansion valve to adjust the valve closing amplitude according to the frequency reduction speed of the compressor.
Further, the acquiring of temperature monitoring data in the air conditioner operation process in real time includes:
when the air conditioner is in a heating operation process, acquiring inner disc temperature monitoring data and exhaust temperature monitoring data in real time;
when the air conditioner is in the refrigerating operation process, the outer disc temperature monitoring data and the exhaust temperature monitoring data are obtained in real time.
Further, the determining whether the current compressor needs to be frequency-down controlled according to the temperature monitoring data includes:
when the air conditioner is in a heating operation process, if the inner disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold, determining that the current compressor needs frequency reduction control;
when the air conditioner is in a refrigerating operation process, if the outer disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold value, determining that the current compressor needs frequency reduction control;
the first temperature preset threshold value is a temperature value corresponding to starting of compressor frequency reduction control.
Further, if necessary, controlling the electronic expansion valve to adjust the valve closing amplitude according to the frequency reduction speed of the compressor, and the method comprises the following steps:
acquiring the frequency of the compressor every unit time;
calculating a down-conversion speed of the compressor;
recalculating the frequency reduction speed of the compressor every interval threshold time;
and adjusting the valve closing amplitude of the electronic expansion valve according to the frequency reduction speed of the compressor in the current interval threshold time.
Further, the calculating the down-conversion speed of the compressor comprises:
and calculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time.
Further, said recalculating the compressor down speed per interval threshold time comprises:
and recalculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time every interval threshold time.
Further, the controlling the valve closing amplitude of the electronic expansion valve according to the frequency reduction speed of the compressor within the current interval threshold time includes:
when the interval threshold time of the compressor is a first frequency reduction speed, controlling the electronic expansion valve to close the valve by a first valve adjusting amplitude;
when the interval threshold time of the compressor is a second frequency reduction speed, controlling the electronic expansion valve to close by a second valve adjusting amplitude;
when the interval threshold time of the compressor is a third frequency reduction speed, controlling the electronic expansion valve to close the valve by a third valve adjusting amplitude;
the first interval threshold time is greater than the second interval threshold time, the second interval threshold time is greater than the third interval threshold time, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the first valve adjusting amplitude is less than the second valve adjusting amplitude, and the second valve adjusting amplitude is less than the third valve adjusting amplitude.
Further, when the compressor decreases the frequency at 1 HZ/sec at 30-second intervals, controlling the electronic expansion valve to close the valve at an amplitude of 2 steps/valve adjusting periods;
controlling the electronic expansion valve to close the valve by the amplitude of 4 steps/valve adjusting period when the frequency of the compressor is reduced by 3 HZ/second at intervals of 20 seconds;
and when the frequency of the compressor is reduced by 5 HZ/s at intervals of 10 seconds, controlling the electronic expansion valve to close 5 steps/0.5 valve adjusting period of amplitude valve closing.
Further, still include:
judging whether the temperature monitoring data in the air conditioner operation process after the valve is closed for adjustment reaches a second temperature preset threshold value or not;
if so, controlling the electronic expansion valve to stop closing the valve for adjustment;
and the second temperature threshold value is a temperature value corresponding to the normal operation of the compressor.
Further, still include:
if the temperature monitoring data in the air conditioner operation process after the valve is closed and adjusted is always larger than a third temperature threshold value, starting unit protection and outputting an alarm signal;
and the third temperature preset threshold value is a temperature value corresponding to the protection of the starting unit.
The control method for the variable frequency air conditioner frequency reduction protection provided by the invention has the advantages that if the compressor needs to reduce the frequency in the normal operation process of the air conditioning system, the electronic expansion valve jumps out of the logic of normal control in the frequency reduction process, the valve closing amplitude can be adjusted according to the frequency reduction speed of the compressor, and the influence of frequent frequency reduction in the prior art on the air conditioning performance is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a control method for down-conversion protection of an inverter air conditioner according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a method for controlling a frequency-down protection of an inverter air conditioner is provided, and fig. 1 is a flowchart of a method for controlling a frequency-down protection of an inverter air conditioner according to an embodiment of the present invention, as shown in fig. 1, including:
s110, acquiring temperature monitoring data in the air conditioner operation process in real time;
it should be understood that the air conditioner operation process comprises a heating operation process and a cooling operation process, and when the air conditioner is in the heating operation process, the inner disc temperature monitoring data and the exhaust temperature monitoring data are acquired in real time;
when the air conditioner is in the refrigerating operation process, the outer disc temperature monitoring data and the exhaust temperature monitoring data are obtained in real time.
S120, judging whether the current compressor needs frequency reduction control or not according to the temperature monitoring data;
in the embodiment of the invention, when the air conditioner is in the heating operation process, if the inner disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold, it is determined that the current compressor needs frequency reduction control;
when the air conditioner is in a refrigerating operation process, if the outer disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold value, determining that the current compressor needs frequency reduction control;
the first temperature preset threshold value is a temperature value corresponding to starting of compressor frequency reduction control.
For example, when the air conditioner is in the heating operation process, if the inner disc temperature monitoring data is 57 ℃, the exhaust temperature monitoring data is 58 ℃ and the first temperature preset threshold is 56 ℃, both the inner disc temperature monitoring data and the exhaust temperature monitoring data reach the first temperature preset threshold, and then down-conversion control needs to be performed to reduce the inner disc temperature and the exhaust temperature.
And S130, if so, controlling the electronic expansion valve to adjust the valve closing amplitude according to the frequency reduction speed of the compressor.
In the embodiment of the present invention, the method may specifically include:
acquiring the frequency of the compressor every unit time;
calculating a down-conversion speed of the compressor;
recalculating the frequency reduction speed of the compressor every interval threshold time;
and adjusting the valve closing amplitude of the electronic expansion valve according to the frequency reduction speed of the compressor in the current interval threshold time.
Further specifically, the calculating the down-conversion speed of the compressor includes:
and calculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time.
Further specifically, said recalculating the compressor down speed per interval threshold time comprises:
and recalculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time every interval threshold time.
In an embodiment of the present invention, the controlling a valve closing amplitude of an electronic expansion valve according to a frequency reduction speed of the compressor within a current interval threshold time includes:
when the interval threshold time of the compressor is a first frequency reduction speed, controlling the electronic expansion valve to close the valve by a first valve adjusting amplitude;
when the interval threshold time of the compressor is a second frequency reduction speed, controlling the electronic expansion valve to close by a second valve adjusting amplitude;
when the interval threshold time of the compressor is a third frequency reduction speed, controlling the electronic expansion valve to close the valve by a third valve adjusting amplitude;
the first interval threshold time is greater than the second interval threshold time, the second interval threshold time is greater than the third interval threshold time, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the first valve adjusting amplitude is less than the second valve adjusting amplitude, and the second valve adjusting amplitude is less than the third valve adjusting amplitude.
Preferably, when the compressor decreases the frequency by 1 HZ/sec at 30-second intervals, the electronic expansion valve is controlled to close the valve by the amplitude of 2 steps/valve adjusting period;
controlling the electronic expansion valve to close the valve by the amplitude of 4 steps/valve adjusting period when the frequency of the compressor is reduced by 3 HZ/second at intervals of 20 seconds;
and when the frequency of the compressor is reduced by 5 HZ/s at intervals of 10 seconds, controlling the electronic expansion valve to close 5 steps/0.5 valve adjusting period of amplitude valve closing.
It should be understood that the time for the compressor to frequency down can be reduced by controlling the valve closing amplitude of the electronic expansion valve, and the frequency down speed of the compressor can be reduced, so that the compressor can be restored to the normal operation frequency as soon as possible.
After the valve is closed, judging whether the temperature monitoring data in the air conditioner operation process after the valve is closed reaches a second temperature preset threshold value;
if so, controlling the electronic expansion valve to stop closing the valve for adjustment;
and the second temperature threshold value is a temperature value corresponding to the normal operation of the compressor.
It should be understood here that, after the valve is closed for adjustment, such as during heating operation, the inner disc temperature monitoring data and the exhaust gas temperature monitoring data are obtained in real time, and if both data are reduced to 45 ℃, the temperature is already reduced to the normal operation temperature at this time, so that it is not necessary to continue to reduce the frequency, that is, the frequency of the compressor is restored to normal at this time, and the adjustment of the electronic expansion valve is stopped, that is, the electronic expansion valve jumps back to the normal control logic.
If the temperature monitoring data in the air conditioner operation process after the valve is closed and adjusted is always larger than a third temperature threshold value, starting unit protection and outputting an alarm signal;
and the third temperature preset threshold value is a temperature value corresponding to the protection of the starting unit.
For example, after the valve is closed, if the exhaust temperature and the inner disc temperature in the heating operation process are always increased to 60 ℃, the unit protection function is started, and an alarm signal is output. The air conditioner can continue to work only when the air conditioner is in fault and needs to be stopped for inspection, so that the air conditioner is stopped by starting the unit for protection, and an alarm signal is output so as to inform personnel of overhauling.
In summary, the control method for frequency-down protection of a variable frequency air conditioner provided by the invention can adjust the valve closing amplitude according to the frequency-down speed of the compressor if the compressor needs to perform frequency-down in the normal operation process of the air conditioning system, and avoid the influence of frequent frequency-down on the air conditioning performance in the prior art because the electronic expansion valve jumps out of the logic of normal control in the frequency-down process, so that the control method for frequency-down protection of the variable frequency air conditioner provided by the invention can slow down the frequency-down speed of the compressor when the temperature rises and the frequency-down is needed, reduce the frequency-down time of the compressor, cannot reduce the performance of the air conditioning system, and prolongs the service life of the compressor compared with the frequency-down mode in the prior art.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims (10)

1. A control method for frequency conversion air conditioner frequency reduction protection is characterized by comprising the following steps:
acquiring temperature monitoring data in the running process of the air conditioner in real time;
judging whether the current compressor needs frequency reduction control or not according to the temperature monitoring data;
if so, controlling the electronic expansion valve to adjust the valve closing amplitude according to the frequency reduction speed of the compressor.
2. The method for controlling down conversion protection of an inverter air conditioner according to claim 1, wherein the obtaining of temperature monitoring data in real time during operation of the air conditioner comprises:
when the air conditioner is in a heating operation process, acquiring inner disc temperature monitoring data and exhaust temperature monitoring data in real time;
when the air conditioner is in the refrigerating operation process, the outer disc temperature monitoring data and the exhaust temperature monitoring data are obtained in real time.
3. The method as claimed in claim 2, wherein said determining whether the current compressor needs the down-conversion control according to the temperature monitoring data comprises:
when the air conditioner is in a heating operation process, if the inner disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold, determining that the current compressor needs frequency reduction control;
when the air conditioner is in a refrigerating operation process, if the outer disc temperature monitoring data and the exhaust temperature monitoring data both reach a first preset temperature threshold value, determining that the current compressor needs frequency reduction control;
the first temperature preset threshold value is a temperature value corresponding to starting of compressor frequency reduction control.
4. The method as claimed in claim 2, wherein the step of controlling the electronic expansion valve to adjust the valve closing amplitude according to the down-conversion speed of the compressor if necessary comprises:
acquiring the frequency of the compressor every unit time;
calculating a down-conversion speed of the compressor;
recalculating the frequency reduction speed of the compressor every interval threshold time;
and adjusting the valve closing amplitude of the electronic expansion valve according to the frequency reduction speed of the compressor in the current interval threshold time.
5. The method as claimed in claim 4, wherein said calculating the down-conversion speed of the compressor comprises:
and calculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time.
6. The method as claimed in claim 4, wherein said recalculating the compressor down-conversion speed every interval threshold time comprises:
and recalculating the ratio of the frequency difference value of the compressor obtained every two adjacent times to the unit time every interval threshold time.
7. The method as claimed in claim 4, wherein said controlling the valve closing amplitude of the electronic expansion valve according to the down-conversion speed of the compressor within the current interval threshold time comprises:
when the interval threshold time of the compressor is a first frequency reduction speed, controlling the electronic expansion valve to close the valve by a first valve adjusting amplitude;
when the interval threshold time of the compressor is a second frequency reduction speed, controlling the electronic expansion valve to close by a second valve adjusting amplitude;
when the interval threshold time of the compressor is a third frequency reduction speed, controlling the electronic expansion valve to close the valve by a third valve adjusting amplitude;
the first interval threshold time is greater than the second interval threshold time, the second interval threshold time is greater than the third interval threshold time, the first frequency reduction speed is less than the second frequency reduction speed, the second frequency reduction speed is less than the third frequency reduction speed, the first valve adjusting amplitude is less than the second valve adjusting amplitude, and the second valve adjusting amplitude is less than the third valve adjusting amplitude.
8. The frequency conversion air conditioner frequency down protection control method according to claim 7,
controlling the electronic expansion valve to close the valve by the amplitude of closing 2 steps/valve adjusting period when the frequency of the compressor is reduced by 1 HZ/second at intervals of 30 seconds;
controlling the electronic expansion valve to close the valve by the amplitude of 4 steps/valve adjusting period when the frequency of the compressor is reduced by 3 HZ/second at intervals of 20 seconds;
and when the frequency of the compressor is reduced by 5 HZ/s at intervals of 10 seconds, controlling the electronic expansion valve to close 5 steps/0.5 valve adjusting period of amplitude valve closing.
9. The method for controlling the frequency down protection of the inverter air conditioner according to claim 1, further comprising:
judging whether the temperature monitoring data in the air conditioner operation process after the valve is closed for adjustment reaches a second temperature preset threshold value or not;
if so, controlling the electronic expansion valve to stop closing the valve for adjustment;
and the second temperature threshold value is a temperature value corresponding to the normal operation of the compressor.
10. The method for controlling the frequency down protection of the inverter air conditioner according to claim 1, further comprising:
if the temperature monitoring data in the air conditioner operation process after the valve is closed and adjusted is always larger than a third temperature threshold value, starting unit protection and outputting an alarm signal;
and the third temperature preset threshold value is a temperature value corresponding to the protection of the starting unit.
CN202111352065.9A 2021-11-16 2021-11-16 Control method for frequency conversion air conditioner frequency reduction protection Active CN113883766B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259918B (en) * 1966-10-14 1968-02-01 Aeg Elotherm Gmbh Process and device for inductive heating of workpieces with constantly changing radii of curvature in the circumferential direction
JP2001241799A (en) * 2000-02-29 2001-09-07 Matsushita Electric Ind Co Ltd Multi-room air conditioner
US20120289139A1 (en) * 2011-05-13 2012-11-15 Azbil Corporation Room pressure controlling system
CN113294885A (en) * 2021-06-22 2021-08-24 宁波奥克斯电气股份有限公司 Air conditioner control method and device, air conditioner and computer readable storage medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1259918B (en) * 1966-10-14 1968-02-01 Aeg Elotherm Gmbh Process and device for inductive heating of workpieces with constantly changing radii of curvature in the circumferential direction
JP2001241799A (en) * 2000-02-29 2001-09-07 Matsushita Electric Ind Co Ltd Multi-room air conditioner
US20120289139A1 (en) * 2011-05-13 2012-11-15 Azbil Corporation Room pressure controlling system
CN113294885A (en) * 2021-06-22 2021-08-24 宁波奥克斯电气股份有限公司 Air conditioner control method and device, air conditioner and computer readable storage medium

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