CN117570518A - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN117570518A
CN117570518A CN202311710850.6A CN202311710850A CN117570518A CN 117570518 A CN117570518 A CN 117570518A CN 202311710850 A CN202311710850 A CN 202311710850A CN 117570518 A CN117570518 A CN 117570518A
Authority
CN
China
Prior art keywords
air
indoor
air conditioner
temperature
evaporator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311710850.6A
Other languages
Chinese (zh)
Inventor
潘子豪
林志成
罗润通
黄杰
刘硕
罗育浩
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
Original Assignee
Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202311710850.6A priority Critical patent/CN117570518A/en
Publication of CN117570518A publication Critical patent/CN117570518A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
    • F24F1/0014—Indoor units, e.g. fan coil units characterised by air outlets having two or more outlet openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting 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
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B41/40—Fluid line 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • 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
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
    • F25D21/125—Removing frost by hot-fluid circulating system separate from the refrigerant system the hot fluid being ambient air
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner and a control method thereof, wherein the air conditioner has a refrigerating function and a heating function; the air conditioner comprises an indoor unit and an outdoor unit, wherein an evaporator and an indoor fan capable of rotating bidirectionally are arranged in the indoor unit, and a condenser is arranged in the outdoor unit; a first refrigerant pipeline and a second refrigerant pipeline are connected in parallel between the evaporator and the condenser; the indoor unit is provided with a first exhaust hole leading to the outside and a first air outlet leading to the inside, the first exhaust hole is communicated with the first air outlet through an exhaust channel, and the evaporator is arranged on the exhaust strip channel; the indoor fan rotates reversely to enable indoor air to enter the indoor unit through the first air outlet and to be discharged from the first exhaust hole, so that the technical problems that an evaporator of an air conditioner is low in defrosting speed and indoor temperature fluctuation is large in defrosting period in the prior art are solved.

Description

Air conditioner and control method thereof
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner and a control method thereof.
Background
With the development of industrial technology industry, the use scene of utilizing the air conditioner to refrigerate is continuously abundant, and the air conditioner is widely applied to places such as a precise temperature control equipment room, a warehouse, an operating room and the like. The equipment in the equipment room works all the year round and has large operation heating value, and even in winter, the equipment in the equipment room requires operation temperature far lower than the environmental temperature between the equipment, so that the air conditioner in the equipment room is required to have stable and reliable low-temperature refrigerating capacity. According to the refrigeration principle, the outside environment temperature is low in winter, the evaporation side pressure is low, the situation of frosting is easy to occur during evaporation, even abnormal shutdown occurs, and the normal use of the air conditioner is influenced. Aiming at the problem, the common solution is to stop the compressor for defrosting, and restart the evaporator for refrigeration after the frost layer of the evaporator is melted; or the opening of the electronic expansion valve is increased by reducing the rotating speed of the external machine, so that the temperature of the refrigerant flowing to the evaporator is increased, and the frost layer is gradually melted. By the method, the temperature of the air outlet of the internal machine is increased or refrigeration is stopped, and the defrosting period is long, so that the refrigeration effect is affected, and the indoor temperature fluctuation is large.
How to accelerate the defrosting of the evaporator and ensure the indoor temperature to be stable is a technical problem to be solved at present.
Disclosure of Invention
Therefore, the invention provides an air conditioner and a control method thereof, which are used for solving the technical problems of low defrosting speed of an evaporator of the air conditioner and large indoor temperature fluctuation during defrosting in the prior art.
In one aspect, the present invention provides an air conditioner having a cooling function and a heating function; the air conditioner comprises an indoor unit and an outdoor unit, wherein an evaporator and an indoor fan capable of rotating bidirectionally are arranged in the indoor unit, and a condenser is arranged in the outdoor unit; a first refrigerant pipeline and a second refrigerant pipeline are connected in parallel between the evaporator and the condenser;
the indoor unit is provided with a first exhaust hole leading to the outside and a first air outlet leading to the inside, the first exhaust hole is communicated with the first air outlet through an exhaust channel, and the evaporator is arranged on the exhaust strip channel; the indoor fan rotates reversely to enable indoor air to enter the indoor unit through the first air outlet.
In some embodiments, a ventilation duct is provided between the outdoor unit and the indoor environment, the outdoor unit is provided with an outdoor fan, and the outdoor fan operates to enable a portion of air passing through the condenser to enter the ventilation duct.
In some embodiments, the indoor unit is further provided with a second air inlet and a second air outlet, and the second air outlet is provided with a second air deflector; the outlet of the ventilating duct is communicated with the second air inlet, and the second air inlet is communicated with the second air outlet through an air inlet channel.
In some embodiments, the indoor unit is provided with a first air inlet, an indoor air channel is arranged between the first air inlet and the first air outlet, the indoor air channel is intersected with the air exhaust channel, and the first air inlet is provided with an indoor electric grille;
and/or the number of the groups of groups,
the outdoor unit is provided with an exhaust panel, a second exhaust hole is formed in the exhaust panel, and an outdoor electric grille is arranged in the second exhaust hole.
In some embodiments, a fan module is disposed on the ventilation duct.
The invention also provides a control method of the air conditioner, which is used for the air conditioner; the air conditioner comprises a defrosting mode and a refrigerating mode, and the control method comprises the following steps: and acquiring the temperature T1 of the evaporator, wherein when T1 is smaller than T0 and the duration time T is larger than T1, the air conditioner is adjusted to be in a defrosting mode, and when T1 is a first preset time, T0 is a first preset temperature.
In some embodiments, the air conditioner has a heating function, and the defrosting mode includes: acquiring the current indoor environment temperature T2, when T1 is less than T2, starting a heating function of the air conditioner, controlling the indoor fan to rotate reversely, closing the first air inlet, and opening the first air outlet; when T1 is more than or equal to T2, an air conditioner heating function is started, the indoor fan stops rotating, and the first air inlet and the first air outlet are both opened.
In some embodiments, the air conditioner has a heating function, and the defrosting mode includes: and acquiring the current indoor environment temperature T2, when T1 is less than T2, starting the heating function of the air conditioner, controlling the indoor fan to stop rotating, opening the first air inlet, and opening the first air outlet.
In some embodiments, a compressor is disposed in the outdoor unit, and when a ventilation duct is disposed between the outdoor unit and the indoor unit, the preset temperature of the indoor environment is T3, and the defrosting mode further includes: acquiring indoor temperature T2 once every second preset time period T2, reducing the rotating speed of the outdoor fan and continuously maintaining the second preset time period T2 when T3-T2 is more than or equal to 2 ℃, and simultaneously reducing the working frequency of the compressor to a first preset working frequency at a first preset speed; and when the temperature of the I T3-T2I is less than 2 ℃, the air conditioner keeps the current state.
In some embodiments, the control method further comprises: in the defrosting mode, when T1 is greater than or equal to T4 and lasts for a third preset time period T3, the air conditioner ends the defrosting mode, and T4 is the second preset temperature.
In some embodiments, the evaporator includes a plurality of refrigerant flow paths, the control method further comprising: and in the defrosting mode, acquiring the temperature T5 of a preset pipeline, and ending the defrosting mode when T5 is more than T6 and the fourth preset time period T4 is continued, wherein T6 is the third preset temperature.
In some embodiments, the air conditioner is provided with an electronic expansion valve, and the defrost mode further includes: and reducing the opening degree of the electronic expansion valve.
When the air conditioner is started for defrosting during heating, the indoor fan is reversed, and indoor air enters the indoor unit to heat the evaporator, so that when the temperature of the refrigerant in the evaporator is not increased yet, the indoor air is used for heating the evaporator, and the defrosting speed of the evaporator is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The drawings in the following description are merely exemplary and other implementations drawings may be derived from the drawings provided without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of physical connection between an indoor unit and an outdoor unit according to an embodiment of the present invention;
FIG. 2 is a simplified schematic diagram illustrating connection between an indoor unit and an outdoor unit according to an embodiment of the present invention;
FIG. 3 is an axial schematic view of an indoor unit with end cover plates removed according to an embodiment of the present invention;
the reference numerals are expressed as:
1. an indoor unit; 101. an evaporator; 2. an outdoor unit; 201. a condenser; 202. a fan module; 203. a compressor; 204. an electronic expansion valve; 301. a first refrigerant pipe; 302. a second refrigerant pipe; 401. an indoor electric grille; 402. outdoor electric grille; 501. a first exhaust hole; 502. a second exhaust hole; 601. a first air inlet; 602. a second air inlet; 701. a first air outlet; 702. a second air outlet; 8. and a ventilation duct.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. It should be understood, however, that the construction, proportion, and size of the drawings, in which the present invention is practiced, are all intended to be illustrative only, and not to limit the scope of the present invention, which should be defined by the appended claims. Any structural modification, proportional change or size adjustment should still fall within the scope of the disclosure without affecting the efficacy and achievement of the present invention. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
The invention provides an air conditioner and a control method thereof, which are used for solving the technical problems of low defrosting speed of an evaporator of the air conditioner and large indoor temperature fluctuation during defrosting in the prior art.
An air conditioner, as shown in fig. 1-3, comprises an indoor unit 1 and an outdoor unit 2, wherein an evaporator 101 and an indoor fan capable of rotating bidirectionally are arranged in the indoor unit 1, and a condenser 201 is arranged in the outdoor unit 2; a first refrigerant pipeline 301 and a second refrigerant pipeline 302 are connected in parallel between the evaporator 101 and the condenser 201;
the indoor unit 1 is provided with a first exhaust hole 501 leading to the outside and a first air outlet 701 leading to the inside, the first exhaust hole 501 is communicated with the first air outlet 701 through an exhaust channel, and the evaporator 101 is arranged on the exhaust strip channel; the reverse rotation of the indoor fan can enable indoor air to enter the indoor unit 1 through the first air outlet 701.
The forward rotation (forward rotation) and the reverse rotation (reverse rotation) of the indoor fan belong to opposite directions, and the forward rotation in the application refers to that when the indoor unit heats or refrigerates normally, the indoor fan rotates to suck indoor air into the indoor unit and then discharge the indoor air from the first air outlet 701. The indoor fan reverse rotation means that indoor air is sucked from the first air outlet 701.
When the air conditioner is used for refrigerating, the high-temperature refrigerant discharged from the compressor 203 is subjected to heat exchange with the outdoor through the condenser 201, then the temperature of the refrigerant is reduced, the refrigerant after the temperature reduction is changed into a low-temperature refrigerant after passing through the first refrigerant pipeline 301 and the electronic expansion valve 204, and the low-temperature refrigerant flows back to the compressor 203 from the second refrigerant pipeline 302 after passing through the evaporator 101. When the indoor refrigeration is performed in winter, the evaporator 101 is easy to frost, and when the evaporator 101 needs to be defrosted, the air conditioner starts a heating function; the high-temperature refrigerant discharged from the compressor 203 flows through the evaporator 101 through the second refrigerant pipe 302 to defrost the evaporator 101; in the initial stage of heating of the air conditioner, the evaporator 101 is in a frosted state due to a large heat generation amount of the indoor equipment, and the frequency of the compressor 203 is low just after the heating mode is adjusted, the refrigerant circulation is insufficient, and the change of the refrigerant in the evaporator 101 is small, at this time, the temperature of the evaporator 101 is smaller than the indoor environment temperature. A certain time is required for the temperature of the refrigerant to rise, and the evaporator 101 cannot be defrosted by the refrigerant during the time period; during the period of time when the temperature of the refrigerant is raised, the indoor fan is reversed, indoor air enters the indoor unit 1 from the first air outlet 701, air is discharged to the outside from the first air outlet 501 through the air discharge channel, and the air heats (defrostes) the evaporator 101 when in the air discharge channel. The temperature of the evaporator 101 can be gradually increased by heating indoor air in the temperature increasing stage of the refrigerant, and the defrosting efficiency of the evaporator 101 is improved. When the air flows through the evaporator 101, the air can not only initially heat the evaporator 101, but also flow through the refrigerant pipeline on the evaporator 101, the temperature of the refrigerant pipeline is higher than that of the air, and at the moment, the air needs to be discharged to the outside through the first exhaust hole 501, so that the air passing through the refrigerant pipeline on the evaporator 101 is prevented from entering the room to cause the increase of the indoor temperature. When the temperature of the refrigerant rises to a certain temperature, for example, exceeds a certain value of the indoor temperature, the indoor fan can stop rotating, and defrosting is performed only through the high-temperature refrigerant, so that the phenomenon that the indoor air absorbs heat from the high-temperature refrigerant to reduce the defrosting efficiency of the evaporator 101 is avoided; when the temperature of the refrigerant increases to a certain temperature, the indoor fan can be continuously rotated reversely, and the heat emitted by the evaporator 101 is discharged to the outside to reduce the indoor temperature fluctuation. Because during refrigeration, part of dust bacteria and the like are condensed on the evaporator 101 when indoor air passes through the evaporator 101, peculiar smell is generated during defrosting, and the air after defrosting is discharged outdoors through the first exhaust hole 501, the pollution to the indoor environment is reduced, and the indoor environment quality is improved. The first air outlet 701 is provided with a first air guide plate by which the flow direction of the air entering the indoor unit 1 is changed to enable the air to pass through the evaporator 101; the air quantity entering the indoor unit 1 can also be changed through the first air deflector.
The indoor fan rotates forward to enable indoor air to be directly discharged into a room from the first air outlet 701 after passing through the evaporator 101, and the indoor fan cannot enable the air to be discharged outdoors from other structures except the first air outlet 701 when being rotated forward under the influence of the specific structure of the indoor unit 1; therefore, it is necessary to reverse the indoor fan and provide the first exhaust hole 501 so that the air passing through the evaporator 101 can be exhausted to the outside.
Preferably, as shown in fig. 1-2, a ventilation duct 8 is provided between the outdoor unit 2 and the indoor environment, and the outdoor unit 2 is provided with an outdoor fan, and the outdoor fan works to enable part of the air passing through the condenser 201 to enter the ventilation duct 8.
When the air conditioner performs heating operation, on one hand, the indoor temperature can be raised due to defrosting of the evaporator 101, and on the other hand, the indoor unit stops refrigerating, so that the indoor cold input is reduced; at this time, the temperature of the outdoor condenser 201 is low, and part of air is sent into the room through the ventilating duct 8 by the outdoor fan, so that the room is refrigerated, the fluctuation of the indoor temperature is reduced, and the stability of the indoor temperature is further ensured.
That is, the air conditioner performs defrosting of the evaporator 101 during heating, and simultaneously, the cold energy generated by the outdoor unit 2 is sent into the room through the ventilating duct 8 to continuously cool the room, so that the synchronous defrosting of the evaporator 101 and indoor cooling are realized, the refrigerating capacity of the air conditioner is improved, and further, the indoor stable low-temperature environment is realized. The outdoor fan is an axial flow fan.
The second air inlet 602 is provided with a first baffle, the first air outlet 501 is provided with a second baffle, and the second air outlet 702 is provided with a third baffle. The three baffles are all driven by motors. The first baffle can close or open the second air inlet 602, the second baffle can close or open the first air outlet 501, and the third baffle can close or open the second air outlet 702.
Preferably, as shown in fig. 1 to 3, the indoor unit 1 is further provided with a second air inlet 602 and a second air outlet 702, and the second air outlet 702 is provided with a second air deflector; the outlet of the ventilation pipeline 8 is communicated with the second air inlet 602, and the second air inlet 602 is communicated with the second air outlet 702 through an air inlet channel.
The ventilating duct 8 is communicated with the indoor unit 1, and is discharged through the second air outlet 702 on the indoor unit 1, and the air with lower outdoor temperature can be more uniformly fed into the room through the first electric air deflector arranged at the second air outlet 702, so that the indoor temperature is more uniform.
The outdoor cold air flows through the air inlet channel, so that the interference of the outdoor cold air on defrosting of the evaporator 101 caused by indoor air in the indoor unit 1 is avoided.
Preferably, as shown in fig. 1-2, the indoor unit 1 is provided with a first air inlet 601, an indoor air channel is arranged between the first air inlet 601 and the first air outlet 701, the indoor air channel intersects with the air exhaust channel, and the first air inlet 601 is provided with an indoor electric grille 401;
and/or the number of the groups of groups,
the outdoor unit 2 is provided with an exhaust panel, a second exhaust hole 502 is arranged on the exhaust panel, and the second exhaust hole 502 is provided with an outdoor electric grille 402.
When the air conditioner is used for refrigerating, indoor air enters the indoor unit 1 through the first air inlet 601, is cooled through the evaporator 101 and is discharged from the first air outlet 701.
The indoor air channel and the exhaust channel are mutually communicated.
The indoor electric grille 401 is arranged at the first air inlet 601, when the indoor fan is reversed to enable indoor air to enter the indoor unit 1 to defrost the evaporator 101, the indoor electric grille 401 closes the first air inlet 601, so that the indoor air entering the indoor unit 1 can be completely discharged from the first exhaust hole 501, the condition that the indoor environment is polluted due to the fact that the air after being defrosted by the evaporator 101 enters the room again is avoided, and the condition that the indoor temperature fluctuation is caused by the fact that the air enters the room after the temperature rises after passing through a refrigerant pipeline on the evaporator 101 is also avoided. When the evaporator 101 is defrosted by the high-temperature refrigerant, the indoor electric grille 401 is closed and the indoor fan stops rotating to reduce the interference of the high-temperature refrigerant to the indoor temperature.
When the air conditioner is used for normal cooling or heating, indoor air enters the indoor air channel from the first air inlet 601 and is discharged from the first air outlet 701.
When the fan of the outdoor unit 2 operates, the outdoor space is discharged from the exhaust panel through the condenser 201. An outdoor electric grille 402 is arranged on the air exhaust panel, when defrosting is carried out, the outdoor electric grille 402 closes the second air exhaust hole 502, the temperature of the air passing through the condenser 201 is reduced, the air with reduced temperature cannot be exhausted from the second air exhaust hole 502, and the air passing through the condenser 201 enters the air duct 8 and then enters a room; that is, the outdoor electric grille 402 is closed to enlarge the indoor air quantity of the outdoor air passing through the condenser 201, further improve the indoor cooling effect and effectively ensure the indoor temperature stability.
Preferably, as shown in fig. 1-2, the ventilation duct 8 is provided with a fan module 202.
Through set up fan module 202 on air pipe 8, when defrosting, the air that accessible fan module 202 further controls the outdoor air after condenser 201 gets into indoor amount of wind, further improves the cooling effect to indoor, guarantees indoor temperature's stability.
The invention also provides a control method of the air conditioner, which is used for the air conditioner; the air conditioner comprises a defrosting mode and a refrigerating mode, and the control method comprises the following steps: and acquiring the temperature T1 of the evaporator 101, wherein when T1 is less than T0 and the duration T is more than T1, the air conditioner is adjusted to be in a defrosting mode, and when T1 is a first preset duration, T0 is a first preset temperature.
Both T0 and T1 can be set manually, such as t0=0 ℃; t1 may be set to 3min, and if it is relatively sensitive to frosting of the evaporator 101, t1 may be set to 1min.
When the temperature T1 of the evaporator 101 is less than 0 ℃, the evaporator 101 starts to frost, and when the duration T is more than 3min, the thickness of the frost on the evaporator 101 is determined to be thicker, and defrosting is required.
The refrigeration mode comprises normal temperature refrigeration and low temperature refrigeration, wherein when the outdoor environment temperature is more than or equal to 14 ℃, normal temperature refrigeration is carried out, and when the outdoor environment temperature is lower than 14 ℃, low temperature refrigeration is started.
Preferably, the air conditioner has a heating function, and the defrosting mode includes: acquiring the current indoor environment temperature T2, when T1 is less than T2, starting a heating function of the air conditioner, controlling the indoor fan to rotate reversely, closing the first air inlet 601, and opening the first air outlet 701; when T1 is more than or equal to T2, an air conditioner heating function is started, the indoor fan stops rotating, and the first air inlet 601 and the first air outlet 701 are both opened.
Directly contacting with the evaporator 101 is the air entering the indoor unit 1, and a temperature sensing device may be disposed on the indoor unit 1 to measure the temperature of the air entering the indoor unit 1 through the first air outlet 701, and the temperature of the air entering the indoor unit 1 through the first air outlet 701 represents the indoor environment temperature T2).
The air conditioner has a heating function, and defrosting is performed by utilizing the heating function of the air conditioner. When defrosting: acquiring the current indoor environment temperature T2, and when T1 is less than T2, describing that the evaporator 101 can be heated by indoor air; the heating function of the air conditioner is started, and the high-temperature refrigerant flows through the evaporator 101 to further heat the evaporator 101. The indoor fan is controlled to rotate reversely, the first air inlet 601 is closed, the first air outlet 701 is opened, and when the indoor air passes through the evaporator 101 to heat the evaporator 101, the temperature and the pressure in the evaporator 101 can be prevented from being too high, and the load of the compressor 203 is prevented from being too high; when T1 is more than or equal to T2, the indoor temperature is lower, the air conditioner heating function is started, the indoor fan stops rotating, indoor air is not required to heat and defrost the evaporator 101, the first air inlet 601 and the first air outlet 701 are both opened, and the heat absorbed by part of the evaporator 101 is transmitted outwards in a natural heat radiation mode, so that the pressure and the temperature in the evaporator 101 are prevented from being too high.
Preferably, the air conditioner has a heating function, and the defrosting mode includes: and acquiring the current indoor environment temperature T2, when T1 is less than T2, starting the heating function of the air conditioner, controlling the indoor fan to stop rotating, opening the first air inlet 601, and opening the first air outlet 701.
The defrost mode includes: acquiring the current indoor environment temperature T2, when T1 is less than T2, indicating that the indoor environment temperature is higher than the temperature of the evaporator 101, starting the heating function of the air conditioner, and defrosting the evaporator 101 by a high-temperature refrigerant; the indoor fan is controlled to stop rotating, so that excessive heat of the evaporator 101 is prevented from being absorbed by air flow, and the defrosting effect of the evaporator 101 is reduced; the first air inlet 601 is opened, the first air outlet 701 is opened, and only the evaporator 101 transfers heat to the air in a heat radiation mode, so that the temperature and the pressure in the evaporator 101 are prevented from being too high.
When the indoor electric grill 401 is provided, the first air inlet 601 may be controlled by closing the indoor electric grill 401. When the outdoor electric grill 402 is provided and the air conditioner is turned on for heating, the outdoor electric grill 402 is turned off to ensure that the air passing through the condenser 201 of the outdoor unit 2 can maximally enter the ventilation duct 8.
Preferably, the compressor 203 is disposed in the outdoor unit 2, and when the ventilation duct 8 is disposed between the outdoor unit 2 and the indoor unit 1, the preset temperature of the indoor environment is T3, and the defrosting mode further includes: acquiring indoor temperature T2 once every second preset time period T2, reducing the rotating speed of the outdoor fan and continuously maintaining the second preset time period T2 when T3-T2 is more than or equal to 2 ℃, and simultaneously reducing the working frequency of the compressor 203 to a first preset working frequency at a first preset speed; and when the temperature of the I T3-T2I is less than 2 ℃, the air conditioner keeps the current state.
The compressor 203 is disposed in the outdoor unit 2, the preset temperature of the indoor environment is T3, and the defrosting mode further includes: the indoor temperature T2 is obtained once every second preset time period T2, when T3-T2 is greater than or equal to 2 ℃, that is, the difference between the indoor actual temperature and the required actual temperature is large, the indoor temperature is lower (the reason for the excessively low temperature is that the indoor temperature is excessively low due to the excessively large air quantity of the cold air conveyed into the room through the ventilation pipeline 8), at this time, the working frequency of the compressor 203 needs to be reduced, and the rotating speed of the outdoor fan needs to be reduced, so that the air quantity of the air conveyed into the room through the ventilation pipeline 8 is reduced. The speed at which compressor 203 decreases in frequency may be twice as high as the normal regulation speed; for example, when the compressor 203 is started, the operating frequency is increased by 10 revolutions per second, and then the operating frequency of the compressor 203 can be reduced at a speed of 20 revolutions per second. The outdoor fan generally has a plurality of gears, and when the rotating speed of the fan is increased or reduced, the fan can be reduced by two gears at a time so as to quickly adjust the air quantity of the air input into the room.
The indoor temperature is acquired every t2, and t2 is continued to avoid frequent increase of frequency or decrease of frequency of the compressor 203 caused by fluctuation of the indoor temperature, which causes a great increase of energy consumption.
And when the temperature of the I T3-T2I is less than 2 ℃, the air conditioner keeps the current state.
Preferably, the defrosting mode further includes: when T2-T3 is more than or equal to 2 ℃, the indoor actual temperature is higher than the preset temperature (target temperature), and although the temperature does not reach the preset temperature, defrosting is needed first, cooling is continued, otherwise the cooling efficiency is too low, and even the air conditioner is damaged; in order to avoid overhigh temperature and overlarge pressure in the evaporator, the indoor fan is controlled to stop rotating while the heating function of the air conditioner is started, the first air inlet 601 is opened, and the first air outlet 701 is opened.
Preferably, the control method further includes: in the defrosting mode, when T1 is greater than or equal to T4 and lasts for a third preset time period T3, the air conditioner ends the defrosting mode, and T4 is the second preset temperature.
T4 may be set to 0 ℃, and for better defrosting, to avoid accidents, T4 may be set to 1 ℃, i.e. the temperature of the evaporator 101 is higher than 0 ℃.
During defrosting, when T1 is greater than or equal to T4, it is indicated that the temperature of the evaporator 101 has risen and the time T3 is continued, T3 may be set to 1min, and in 1min in succession, the temperature of the evaporator 101 is higher than T4, it is indicated that there is no frost formed on the evaporator 101, and the possibility of temperature fluctuation is eliminated. In this way, it is determined that the evaporator 101 is defrosted, and only the conventional temperature sensing bulb for detecting the evaporator 101 is needed, which is very simple and accurate.
Preferably, the evaporator 101 includes a plurality of refrigerant flow paths, and the control method further includes: and in the defrosting mode, acquiring the temperature T5 of a preset pipeline, and ending the defrosting mode when T5 is more than T6 and the fourth preset time period T4 is continued, wherein T6 is the third preset temperature.
The evaporator 101 includes a plurality of refrigerant channels, and when the refrigerant flows through the plurality of refrigerant channels, the temperatures of the different refrigerant channels are different, and it is clear from actual observation which refrigerant channel is most affected by the refrigerant, and the refrigerant channel is set as the preset pipeline. When refrigerating, the preset pipeline is influenced by the refrigerant to the greatest extent, and frosting is also the most serious. As long as the most severely frosted refrigerant flow path completes defrosting, other refrigerant flow paths also complete defrosting. The control method further comprises the following steps: in the defrosting mode, the temperature T5 of the preset pipeline is obtained, and when T5 is more than T6 and the fourth preset time period T4 is continued, the defrosting mode is ended, and T6 is the third preset temperature. Since the preset line is the most frosted line, T6 may be set to 0 ℃ and T4 may be set to 30 ". By observing the pipeline with the most serious frosting, the evaporator 101 at the position can be judged more accurately and rapidly based on the pipeline.
Preferably, the air conditioner is provided with an electronic expansion valve 204, and the defrosting mode further includes: the opening degree of the electronic expansion valve 204 is reduced.
The air conditioner is provided with an electronic expansion valve 204, and the defrost mode further includes: under the heating function, the opening of the electronic expansion valve 204 is reduced, so that the temperature of the refrigerant in the evaporator 101 can be increased, and the defrosting is facilitated to be accelerated.
Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (12)

1. An air conditioner is characterized in that the air conditioner has a refrigerating function and a heating function; the air conditioner comprises an indoor unit (1) and an outdoor unit (2), wherein an evaporator (101) and an indoor fan capable of rotating bidirectionally are arranged in the indoor unit (1), and a condenser (201) is arranged in the outdoor unit (2); a first refrigerant pipeline (301) and a second refrigerant pipeline (302) are connected in parallel between the evaporator (101) and the condenser (201);
the indoor unit (1) is provided with a first exhaust hole (501) leading to the outside and a first air outlet (701) leading to the inside, the first exhaust hole (501) is communicated with the first air outlet (701) through an exhaust channel, and the evaporator (101) is arranged on the exhaust channel; the indoor fan rotates reversely, so that indoor air can enter the indoor unit (1) through the first air outlet (701) and is discharged from the first exhaust hole (501).
2. An air conditioner according to claim 1, characterized in that a ventilation duct (8) is provided between the outdoor unit (2) and the indoor environment, the outdoor unit (2) being provided with an outdoor fan which is operative to enable part of the air passing through the condenser (201) to enter the ventilation duct (8).
3. The air conditioner according to claim 2, wherein the indoor unit (1) is further provided with a second air inlet (602) and a second air outlet (702), the second air outlet (702) being provided with a second air deflector; the outlet of the ventilating duct (8) is communicated with the second air inlet (602), and the second air inlet (602) is communicated with the second air outlet (702) through an air inlet channel.
4. The air conditioner according to claim 2, wherein the indoor unit (1) is provided with a first air inlet (601), an indoor air channel is arranged between the first air inlet (601) and the first air outlet (701), the indoor air channel is intersected with the air exhaust channel, and the first air inlet (601) is provided with an indoor electric grille (401);
and/or the number of the groups of groups,
the outdoor unit (2) is provided with an exhaust panel, a second exhaust hole (502) is formed in the exhaust panel, and the second exhaust hole (502) is provided with an outdoor electric grille (402).
5. An air conditioner according to any one of claims 2-4, characterized in that a fan module (202) is provided on the ventilation duct (8).
6. A control method of an air conditioner, characterized by being used for the air conditioner according to any one of claims 1 to 5; the air conditioner comprises a defrosting mode and a refrigerating mode, and the control method comprises the following steps: and acquiring the temperature T1 of the evaporator (101), wherein when T1 is less than T0 and the duration time T is more than T1, the air conditioner is adjusted to be in a defrosting mode, and when T1 is a first preset time, T0 is a first preset temperature.
7. The control method of an air conditioner according to claim 6, wherein the air conditioner has a heating function, and the defrosting mode includes: acquiring the current indoor environment temperature T2, when T1 is less than T2, starting a heating function of the air conditioner, controlling the indoor fan to rotate reversely, closing a first air inlet (601), and opening a first air outlet (701); when T1 is more than or equal to T2, an air conditioner heating function is started, the indoor fan stops rotating, and the first air inlet (601) and the first air outlet (701) are both opened.
8. The control method of an air conditioner according to claim 6, wherein the air conditioner has a heating function, and the defrosting mode includes: and acquiring the current indoor environment temperature T2, when T1 is less than T2, starting a heating function of the air conditioner, controlling the indoor fan to stop rotating, opening the first air inlet (601), and opening the first air outlet (701).
9. The control method of an air conditioner according to claim 8, wherein when a compressor (203) is provided in the outdoor unit (2), and a ventilation duct (8) is provided between the outdoor unit (2) and the indoor unit (1), the preset temperature of the indoor environment is T3, and the defrosting mode further includes: acquiring indoor temperature T2 once every second preset time period T2, reducing the rotating speed of the outdoor fan and continuously maintaining the second preset time period T2 when T3-T2 is more than or equal to 2 ℃, and simultaneously reducing the working frequency of the compressor (203) to a first preset working frequency at a first preset speed; and when the temperature of the I T3-T2I is less than 2 ℃, the air conditioner keeps the current state.
10. The control method of an air conditioner according to claim 6, further comprising: in the defrosting mode, when T1 is greater than or equal to T4 and lasts for a third preset time period T3, the air conditioner ends the defrosting mode, and T4 is the second preset temperature.
11. The control method of an air conditioner according to any one of claims 7 to 10, wherein the evaporator (101) includes a plurality of refrigerant flow paths, the control method further comprising: and in the defrosting mode, acquiring the temperature T5 of a preset pipeline, and ending the defrosting mode when T5 is more than T6 and the fourth preset time period T4 is continued, wherein T6 is the third preset temperature.
12. The control method of an air conditioner according to claim 7, wherein the air conditioner is provided with an electronic expansion valve (204), and the defrosting mode further includes: and reducing the opening degree of the electronic expansion valve (204).
CN202311710850.6A 2023-12-13 2023-12-13 Air conditioner and control method thereof Pending CN117570518A (en)

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CN202311710850.6A CN117570518A (en) 2023-12-13 2023-12-13 Air conditioner and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311710850.6A CN117570518A (en) 2023-12-13 2023-12-13 Air conditioner and control method thereof

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CN117570518A true CN117570518A (en) 2024-02-20

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