CN111174373B - Air conditioning system and control method thereof - Google Patents

Air conditioning system and control method thereof Download PDF

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Publication number
CN111174373B
CN111174373B CN202010005105.1A CN202010005105A CN111174373B CN 111174373 B CN111174373 B CN 111174373B CN 202010005105 A CN202010005105 A CN 202010005105A CN 111174373 B CN111174373 B CN 111174373B
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China
Prior art keywords
conditioning system
air conditioning
humidity
expansion valve
electronic expansion
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CN202010005105.1A
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Chinese (zh)
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CN111174373A (en
Inventor
周树锋
陈国强
龙韦韦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202010005105.1A priority Critical patent/CN111174373B/en
Publication of CN111174373A publication Critical patent/CN111174373A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • 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
    • F24F2110/20—Humidity
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention provides an air conditioning system comprising: an electronic expansion valve; the heating module system can increase the temperature of the refrigerant flowing through the electronic expansion valve, so that condensed water on the surface of the electronic expansion valve is dried. According to the air conditioning system, the heating module can heat the refrigerant in the defrosting mode, so that the temperature of the refrigerant is increased, the temperature of the refrigerant passing through the electronic expansion valve is high enough, condensed water on the surface of the electronic expansion valve is dried, and the failure of the electronic expansion valve caused by surface accumulated water is reduced.

Description

Air conditioning system and control method thereof
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioning system and a control method thereof.
Background
In recent years, system faults caused by faults of the electronic expansion valve in the use of an air conditioning system are frequent, and researches show that the fault reasons are that a frosting condition exists in a valve body and a coil of the electronic expansion valve under a heating mode, and accumulated water exists at the outer edge of the coil, the outer wall of the valve body, a buckle of the valve body and the like after automatic defrosting, so that the faults are caused due to the fact that the insulation resistance of the coil of the electronic expansion valve is reduced.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the surface of the electronic expansion valve is condensed and accumulated with water to cause failure, and provides an air conditioning system and a control method thereof.
In order to solve the above problems, the present invention provides an air conditioning system comprising:
an electronic expansion valve;
the heating module system can increase the temperature of the refrigerant flowing through the electronic expansion valve, so that condensed water on the surface of the electronic expansion valve is dried.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the air conditioning system further comprises a humidity sensor for detecting the humidity of the outdoor air.
Preferably, the air conditioning system further comprises:
the indoor heat exchanger, the outdoor heat exchanger, the four-way valve component, the compressor, the heating module and the electronic expansion valve are arranged between the outdoor heat exchanger and the indoor heat exchanger.
A control method of the air conditioning system comprises the following steps:
judging whether the outdoor air humidity is greater than or equal to a preset humidity or not;
and if the humidity of the outdoor air is greater than or equal to the preset humidity, starting the heating module, increasing the temperature of the refrigerant, and drying the condensed water on the surface of the electronic expansion valve.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, when the air conditioning system operates in the heating mode to reach the defrosting condition, it is determined whether the outdoor air humidity is greater than a preset humidity.
Preferably, if the humidity of the outdoor air is less than the preset humidity, the heating module is not started.
Preferably, if the humidity of the outdoor air is greater than or equal to the preset humidity, the heating module is started after the compressor is operated to the defrosting set frequency and maintained for a first preset time.
Preferably, the heating module is started, and after the second preset time is maintained, the heating module is closed, and the air conditioning system exits the defrosting mode.
Preferably, the air conditioning system presents a defrost-specific mode symbol to the user before the heating module is activated.
Preferably, if the humidity of the outdoor air is greater than or equal to the preset humidity, the four-way valve is switched to the cooling mode, the inner fan and the outer fan are stopped, and the compressor runs at the set frequency.
The air conditioning system and the control method thereof provided by the invention at least have the following beneficial effects:
according to the air conditioning system, the heating module can heat the refrigerant in the defrosting mode, so that the temperature of the refrigerant is increased, the temperature of the refrigerant passing through the electronic expansion valve is high enough, condensed water on the surface of the electronic expansion valve is dried, and the failure of the electronic expansion valve caused by surface accumulated water is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention.
The reference numerals are represented as:
1. an electronic expansion valve; 2. a heating module; 3. an indoor heat exchanger; 4. an outdoor heat exchanger; 5. a four-way valve member; 6. a compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Referring to fig. 1, an embodiment of the present invention provides an air conditioning system, including: an electronic expansion valve 1; the heating module 2 is arranged at the upstream of the electronic expansion valve 1 along the flow direction of the refrigerant, and the heating module 2 can increase the temperature of the refrigerant flowing through the electronic expansion valve 1 so as to dry condensed water on the surface of the electronic expansion valve 1.
The electronic expansion valve 1 operates in a winter heating mode, the temperature of the electronic expansion valve 1 is low, and the condensate water generated by the frosting and defrosting of the valve body is inevitable. Therefore, it is necessary to remove the condensed water generated after defrosting. According to the air conditioning system provided by the embodiment of the invention, the heating module 2 can heat the refrigerant in the defrosting mode, so that the temperature of the refrigerant is increased, the temperature of the refrigerant passing through the electronic expansion valve 1 is ensured to be high enough, condensed water on the surface of the electronic expansion valve 1 is dried, and the failure of the electronic expansion valve 1 caused by surface accumulated water is reduced.
Preferably, the electronic expansion valve 1 needs to be condensed and frosted when the humidity in the air reaches a certain condition, and the heating module 2 needs to be started at this time, so the air conditioning system further includes a humidity sensor for detecting the humidity of the outdoor air, and the heating module 2 is started when the temperature of the outdoor air reaches the frosting condition or the condensation condition, otherwise, the heating module 2 does not need to be started, and the conventional defrosting mode is operated.
Preferably, the air conditioning system further comprises an indoor heat exchanger 3, an outdoor heat exchanger 4, a four-way valve component 5 and a compressor 6, wherein the heating module 2 and the electronic expansion valve 1 are arranged between the outdoor heat exchanger 4 and the indoor heat exchanger 3 and are positioned on the high-pressure side of the air conditioning system.
In the embodiment of the invention, the temperature of the refrigerant at the high-pressure side is increased through the heating module 2, so that the temperature of the refrigerant at the low-pressure side is also increased. Compared with the normal defrosting mode, the refrigerant temperature is higher than the indoor temperature, heat cannot be absorbed indoors, and small indoor temperature fluctuation is guaranteed.
The embodiment of the invention also provides a control method of the air conditioning system, which comprises the following steps:
s1, when the air conditioning system runs in the heating mode and reaches a defrosting condition, judging whether the outdoor air humidity is greater than or equal to a preset humidity;
and S2, if the humidity of the outdoor air is less than the preset humidity, the heating module 2 is not started, the air conditioning system enters a conventional defrosting mode, namely, the operation of the internal and external fans, the four-way valve component 5 and the compressor 6 is stopped, the four-way valve component 5 is recovered to the refrigerating operation, and the compressor is started to start defrosting. And after the four-way valve component is closed for ten seconds, the compressor starts to operate until the defrosting set frequency is reached, and at the moment, the inner fan and the outer fan are not started.
And S3, if the outdoor air humidity is greater than or equal to the preset humidity, the air conditioning system displays a special defrosting mode symbol to a user, and after the compressor 6 operates to a defrosting set frequency and maintains the first preset time, the heating module 2 is started, the temperature of the refrigerant is increased, and the condensed water on the surface of the electronic expansion valve 1 is dried.
And S4, starting the heating module 2, closing the heating module 2 after maintaining the second preset time, enabling the air-conditioning system to exit the defrosting mode, adjusting the four-way valve component 5 to be in heating operation, starting the compressor 6, starting the internal and external fans, and enabling the air-conditioning system to enter normal heating operation.
In this embodiment, in the special defrosting mode, the four-way valve unit 5 is switched to the cooling mode, the internal and external fans are stopped, the compressor 6 is operated at a set frequency, and the refrigerant passes through the electronic expansion valve 1 after passing through the outdoor heat exchanger 4 and the heating module 2. At this time, the heating module 2 is opened, so that the temperature of the refrigerant is increased, and the temperature of the refrigerant passing through the electronic expansion valve 1 is ensured to be high enough, so that the condensed water on the valve body is dried.
When the operation mode of the air conditioner is switched during defrosting, such as air supply or shutdown, the air conditioner exits the special defrosting mode, the special defrosting symbol is cancelled, and the air conditioner operates according to a set mode.
According to the control method provided by the embodiment of the invention, the temperature of the high-pressure side refrigerant is increased through the heating module, so that the temperature of the low-pressure side refrigerant is increased at the same time. Compared with the normal defrosting mode, the refrigerant temperature is higher than the indoor temperature, heat cannot be absorbed indoors, and small indoor temperature fluctuation is guaranteed.
The air conditioning system provided by the embodiment of the invention aims at the problem that the electronic expansion valve fails due to the fact that the surface of the electronic expansion valve is condensed or frosted due to overlarge air humidity of the air conditioning system running in a heating mode, and when the outdoor air humidity is greater than or equal to the preset humidity, the heating module is started to increase the temperature of the refrigerant and ensure that the temperature of the refrigerant passing through the electronic expansion valve 1 is high enough, so that the condensed water on the surface of the electronic expansion valve 1 is dried, and the failure rate of the electronic expansion valve 1 due to surface water accumulation is reduced.
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 (9)

1. A control method of an air conditioning system, characterized in that the air conditioning system includes: an electronic expansion valve (1); the heating module (2) is arranged at the upstream of the electronic expansion valve (1) along the flow direction of a refrigerant, and the heating module (2) system can improve the temperature of the refrigerant flowing through the electronic expansion valve (1) so as to dry condensed water on the surface of the electronic expansion valve (1);
the control method comprises the following steps:
judging whether the outdoor air humidity is greater than or equal to a preset humidity or not;
if the humidity of the outdoor air is greater than or equal to the preset humidity, the heating module (2) is started, the temperature of the refrigerant is increased, and the condensed water on the surface of the electronic expansion valve (1) is dried.
2. The control method of an air conditioning system according to claim 1, wherein when the air conditioning system operates in the heating mode to reach a defrosting condition, it is determined whether the outdoor air humidity is greater than a preset humidity.
3. The control method of an air conditioning system according to claim 1, wherein the heating module (2) is not activated if the outdoor air humidity is less than a preset humidity.
4. The control method of the air conditioning system according to claim 1, wherein if the outdoor air humidity is greater than or equal to the preset humidity, the heating module (2) is activated after the compressor (6) is operated to the defrosting setting frequency and maintained for a first preset time.
5. The control method of the air conditioning system according to claim 1, wherein the heating module (2) is started, and after maintaining the second preset time, the heating module (2) is turned off, and the air conditioning system exits the defrosting mode.
6. The control method of an air conditioning system according to claim 1, wherein the air conditioning system presents a special defrost mode symbol to a user before the heating module (2) is activated.
7. The control method of the air conditioning system according to claim 1, wherein if the outdoor air humidity is greater than or equal to a preset humidity, the four-way valve is switched to a cooling mode, the inner and outer fans are stopped, and the compressor (6) is operated at a set frequency.
8. The control method of an air conditioning system according to claim 1, further comprising a humidity sensor for detecting an outdoor air humidity.
9. The control method of an air conditioning system according to claim 1, characterized in that the air conditioning system further comprises: the heating device comprises an indoor heat exchanger (3), an outdoor heat exchanger (4), a four-way valve component (5) and a compressor (6), wherein a heating module (2) and an electronic expansion valve (1) are arranged between the outdoor heat exchanger (4) and the indoor heat exchanger (3).
CN202010005105.1A 2020-01-03 2020-01-03 Air conditioning system and control method thereof Active CN111174373B (en)

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Application Number Priority Date Filing Date Title
CN202010005105.1A CN111174373B (en) 2020-01-03 2020-01-03 Air conditioning system and control method thereof

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CN111174373B true CN111174373B (en) 2021-02-19

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111692705B (en) * 2020-06-08 2021-06-18 广东美的制冷设备有限公司 Control method, control device, air conditioning system, and computer-readable storage medium

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8887518B2 (en) * 2010-09-30 2014-11-18 Trane International Inc. Expansion valve control system and method for air conditioning apparatus
CN203908132U (en) * 2014-05-30 2014-10-29 广东美的制冷设备有限公司 Air conditioning system
CN205079505U (en) * 2015-10-14 2016-03-09 林勇 Electricity boosting ally oneself with air conditioning unit more
CN206856435U (en) * 2017-05-16 2018-01-09 南方英特空调有限公司 A kind of suitable conventional vehicle is changed to the heat pump type air conditioning system of electric car

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