CN114370692A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN114370692A CN114370692A CN202210188462.5A CN202210188462A CN114370692A CN 114370692 A CN114370692 A CN 114370692A CN 202210188462 A CN202210188462 A CN 202210188462A CN 114370692 A CN114370692 A CN 114370692A
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- flow control
- air conditioner
- defrosting
- heat exchanging
- heat
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
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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)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a control method thereof, the air conditioner comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger, an outdoor fan, a flow control valve set and a controller, wherein the outdoor heat exchanger comprises: at least two heat transfer portions are parallelly connected, and flow control valves includes: at least two flow control valves are respectively connected between the outlet of the compressor and the corresponding heat exchange parts; the controller is configured to: operating a heating mode; when the air conditioner meets the defrosting condition, the defrosting mode is operated: and (3) closing the outdoor fan, and opening the at least two flow control valves according to a preset mode until the at least two heat exchange parts complete defrosting. Thus, after the outdoor heat exchanger is frosted, the opening of the flow control valve is controlled, so that the refrigerant enters the heat exchanging part to defrost the heat exchanging part. Meanwhile, when a part of the heat exchanging parts is defrosted in the air conditioner, the rest of the heat exchanging parts are in a heating mode.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
In the related art, when the air conditioner is in the heating mode for a long time, the outdoor heat exchanger is in the heat absorption state for a long time, and a large amount of frost is condensed on the outdoor heat exchanger, so that the use of the outdoor heat exchanger is affected. In the related art, the defrosting mode of the air conditioner may be used to remove frost on the outdoor heat exchanger. However, in the prior art, when the air conditioner is operated in the defrosting mode, the air conditioner is not heated, so that the use feeling of the indoor environment is poor when the air conditioner is operated in the defrosting mode.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the present invention to provide an air conditioner that is comfortable to use.
Another object of the present invention is to provide a control method of an air conditioner, which is adapted to control the air conditioner.
An air conditioner according to an embodiment of the present invention includes: the system comprises a compressor, a four-way valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger, an outdoor fan, a flow control valve group and a controller, wherein the compressor drives a refrigerant to circulate and is provided with an inlet and an outlet; the refrigerant flows in and out through the four-way valve to guide the flow of the refrigerant, wherein the four-way valve is respectively connected with the inlet and the outlet; the indoor heat exchanger is connected with the four-way valve; the throttling device is connected with the indoor heat exchanger; the outdoor heat exchanger performs heat exchange between a refrigerant and outdoor air when the compressor performs heating, and includes: at least two heat exchange parts, wherein the at least two heat exchange parts are connected in parallel, one end of each heat exchange part is connected with the throttling device, and the other end of each heat exchange part is connected with the four-way valve; the outdoor fan is arranged on one side of the outdoor heat exchanger; and, the flow control valve block includes: at least two flow control valves respectively connected between an outlet of the compressor and the corresponding heat exchanging parts, the controller being configured to: running a heating mode, wherein the refrigerant circulates along the compressor, the four-way valve, the indoor heat exchanger, the throttling device, the outdoor heat exchanger, the four-way valve and the compressor in sequence; when the air conditioner meets the defrosting condition, operating a defrosting mode: and the outdoor fan is closed, and at least two flow control valves are opened according to a preset mode until all the at least two heat exchange parts finish defrosting.
According to the air conditioner provided by the embodiment of the invention, the flow control valve is arranged between the heat exchange part and the outlet of the compressor, and after frosting is formed on the outdoor heat exchanger, the opening of the flow control valve can be controlled, so that the refrigerant enters the heat exchange part to defrost the heat exchange part. Meanwhile, when partial heat exchanging parts are defrosted in the air conditioner, the rest heat exchanging parts are suitable for a heating mode, so that the heating mode can be still performed in the air conditioner when the air conditioner is defrosted, and the use feeling of the air conditioner is improved.
In some embodiments, at least two of the heat exchange portions are arranged in an up-down direction; the controller is further configured to: when the defrosting mode is operated, the outdoor fan is closed, and the at least two flow control valves are sequentially opened according to the sequence of the corresponding heat exchange parts from top to bottom until the at least two heat exchange parts complete defrosting.
In some embodiments, the controller is further configured to: when the defrosting mode is operated, the outdoor fan is closed, the flow control valve corresponding to the heat exchanging part above is opened until the heat exchanging part above completes defrosting; the outdoor fan is started, the flow control valve corresponding to the heat exchanging part above is closed, and the preset time is maintained; and the outdoor fan is closed, the flow control valve corresponding to the heat exchange part below is opened until the heat exchange part below completes defrosting.
In some embodiments, the controller is further configured to: when the defrosting mode is operated, the outdoor fan is started, the flow control valve corresponding to the upper heat exchanging part is closed, the preset time is maintained, the outdoor fan is closed, the flow control valve corresponding to the lower heat exchanging part is opened until the lower heat exchanging part finishes defrosting, and the operation is repeated until the lowest heat exchanging part finishes defrosting.
In some embodiments, the flow ratio of the flow control valve to the throttling device above the corresponding is W1, and W1 satisfies the relation: w1 is more than or equal to 20 percent and less than or equal to 25 percent; the flow rate ratio of the flow rate control valve corresponding to the lowermost heat exchanging portion to the throttling device is W2, and W2 satisfies the relation: w2 is more than or equal to 30 percent and less than or equal to 35 percent.
In some embodiments, the outdoor heat exchanger further comprises: the flow control valve is arranged between the throttling device and the flow control valve, one end of the throttling device is connected with the throttling device, the other end of the throttling device is connected with at least two ends of the heat exchanging part, and the supercooling heat exchanging part is connected to the bottommost heat exchanging part and the corresponding flow control valve.
According to the control method of the air conditioner of the embodiment of the invention, the air conditioner comprises the following steps: compressor, cross valve, indoor heat exchanger, throttling arrangement, outdoor heat exchanger, outdoor fan and flow control valves, outdoor heat exchanger includes: at least two heat transfer portions, at least two heat transfer portion parallel connection, at least two the one end of heat transfer portion with throttling arrangement is connected and the other end with the cross valve is connected, the flow control valves includes: at least two flow control valves respectively connected between the outlet of the compressor and the corresponding heat exchanging part;
the control method comprises the following steps:
s1, starting the air conditioner;
s2, operating a heating mode, wherein the refrigerant circulates along the compressor, the four-way valve, the indoor heat exchanger, the throttling device, the outdoor heat exchanger, the four-way valve and the compressor in sequence;
and S3, when the air conditioner meets the defrosting condition, operating a defrosting mode: and the outdoor fan is closed, and at least two flow control valves are opened according to a preset mode until all the at least two heat exchange parts finish defrosting.
According to the control method of the air conditioner, when the air conditioner meets the defrosting condition, the air conditioner is suitable for running the defrosting mode, the outdoor fan is closed, and the flow control valve is suitable for being opened according to the preset mode, so that frost on the outdoor heat exchanger can be eliminated.
In some embodiments, at least two of the heat exchange portions are arranged in an up-down direction;
the defrost mode includes:
and the outdoor fan is closed, and the at least two flow control valves are sequentially opened according to the sequence of the corresponding heat exchange parts from top to bottom until the at least two heat exchange parts complete defrosting.
In some embodiments, the defrost mode comprises:
s31, the outdoor fan is closed, the flow control valve corresponding to the heat exchanging part above is opened until the heat exchanging part above completes defrosting;
s32, the outdoor fan is started, the flow control valve corresponding to the heat exchanging part above is closed, and the preset time is maintained;
and S33, the outdoor fan is closed, the flow control valve corresponding to the heat exchange part below is opened until the heat exchange part below completes defrosting.
In some embodiments, the defrost mode further comprises:
and S34, repeating the step S32 and the step S33 until the lowest heat exchange part finishes defrosting.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention.
Reference numerals:
the air-conditioner (10) is provided with,
the compressor 100, the inlet 110, the outlet 120,
a four-way valve 200 is provided,
the indoor heat exchanger 300 is constructed such that,
the flow-restriction device 400 is provided with a flow-restriction device,
an outdoor heat exchanger 500, a heat exchange part 510, a supercooling heat exchange part 520,
a flow control valve block 700 and a flow control valve 710.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The air conditioner 10 mentioned in the present application performs a refrigeration cycle of the air conditioner 10 by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat-exchanged.
The compressor 100 compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve, and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 100. The evaporator can achieve a refrigerating effect by heat exchange with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner 10 can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner 10 refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger 300, the indoor unit of the air conditioner includes an indoor heat exchanger 300, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger 300 and the outdoor heat exchanger 500 function as a condenser or an evaporator. The air conditioner serves as a heater in a heating mode when the indoor heat exchanger 300 is used as a condenser, and serves as a cooler in a cooling mode when the indoor heat exchanger 300 is used as an evaporator.
An air conditioner 10 according to an embodiment of the present invention is described below with reference to fig. 1 to 4, including: the air conditioner includes a compressor 100, a four-way valve 200, an indoor heat exchanger 300, a throttling device 400, an outdoor heat exchanger 500, an outdoor fan (not shown), a flow control valve set 700, and a controller (not shown). It is to be understood that the air conditioner 10 to which the present application is applicable includes a single heating mode air conditioner 10 and an air conditioner 10 having a heating mode and a cooling mode.
Specifically, the compressor 100 drives the flow of the refrigerant, and the compressor 100 has an inlet 110 and an outlet 120; a refrigerant flows in and out through the four-way valve 200 to guide the flow of the refrigerant, wherein the four-way valve 200 is connected to the inlet 110 and the outlet 120, respectively; the indoor heat exchanger 300 is connected with the four-way valve 200; the throttling device 400 is connected with the indoor heat exchanger 300; the outdoor heat exchanger 500 performs heat exchange between a refrigerant and outdoor air when the compressor 100 performs heating, and the outdoor heat exchanger 500 includes: at least two heat exchanging parts 510, the at least two heat exchanging parts 510 being connected in parallel, one end of the at least two heat exchanging parts 510 being connected to the throttling device 400 and the other end of the at least two heat exchanging parts 510 being connected to the four-way valve 200; the outdoor fan is arranged at one side of the outdoor heat exchanger 500; and, the flow control valve block 700 includes: at least two flow control valves 710, the at least two flow control valves 710 being respectively connected between the outlet 120 of the compressor 100 and the corresponding heat exchanging part 510, the controller being configured to: in the heating mode, a refrigerant circulates along the compressor 100, the four-way valve 200, the indoor heat exchanger 300, the throttling device 400, the outdoor heat exchanger 500, the four-way valve 200, and the compressor 100 in sequence; when the air conditioner 10 satisfies the defrosting condition, the defrosting mode is operated: the outdoor fan is turned off, and the at least two flow control valves 710 are opened in a preset manner until the at least two heat exchanging parts 510 are completely defrosted. .
In this way, in the process of using the air conditioner 10, the user can select the mode capable of operating on the controller to control the air conditioner 10 to operate the heating mode or the defrosting mode, so that the service performance of the air conditioner 10 can be improved under the condition that the air conditioner 10 meets the user requirement, the service life of the air conditioner 10 is prolonged, and the market competitiveness of the air conditioner 10 is improved.
It can be understood that the compressor 100 is adapted to drive the refrigerant to circulate, and the refrigerant flowing out of the compressor 100 passes through the four-way valve 200, and then is adapted to pass through the indoor heat exchanger 300, the throttling device 400, and the outdoor heat exchanger 500 to exchange heat and then return to the compressor 100, so as to form a heating mode of the air conditioner 10.
That is, in the heating mode, the refrigerant flows from the compressor 100 to the indoor heat exchanger 300, the throttle device 400, and the outdoor heat exchanger 500, and then returns to the compressor 100. However, when the air conditioner 10 is used in the heating mode for a long time, a large amount of frost is often accumulated on the outdoor heat exchanger 500, which affects the usability of the outdoor heat exchanger 500.
Furthermore, since the outdoor heat exchanger 500 includes at least two heat exchanging portions 510 connected to the four-way valve 200 and the throttle device 400, and the flow control valve 710 is disposed between the outlet 120 of the compressor 100 and the corresponding heat exchanging portion 510, the flow control valve 710 is adapted to be selectively opened and closed so that the corresponding flow control valve 710 is adapted to control a flow path of the corresponding heat exchanging portion 510 to which the refrigerant correspondingly flows, and when the high-temperature and high-pressure refrigerant enters the heat exchanging portion 510 of the outdoor heat exchanger 500, heat is adapted to be dissipated from the heat exchanging portion 510 so that frost on the heat exchanging portion 510 is adapted to be melted, thereby performing defrosting of the outdoor heat exchanger 500.
Specifically, after the air conditioner 10 operates in the heating mode, the flow control valve 710 is adapted to be opened to control the refrigerant to flow into the corresponding heat exchange portion 510, so that the refrigerant flowing out of the compressor 100 is adapted to enter the heat exchange portion 510 of the corresponding flow control valve 710, and the heat in the refrigerant is adapted to be released on the heat exchange portion 510 of the corresponding outdoor heat exchanger 500, so that the frost on the heat exchange portion 510 is adapted to be removed; after one heat exchanging portion 510 completes defrosting, the current flow control valve 710 is adapted to be closed, and the flow control valve 710 corresponding to the next heat exchanging portion 510 is adapted to be opened, so that the control refrigerant flows into the other heat exchanging portion 510 to remove the frost thereon. After each portion of the outdoor heat exchanger 500 has been defrosted, it is appropriate to control the air conditioner 10 to return to the heating mode for subsequent operation.
Meanwhile, when defrosting is performed on a part of the heat exchanging parts 510 of the outdoor heat exchanger 500, the remaining heat exchanging parts 510 of the outdoor heat exchanger 500 are adapted to participate in a cycle of a heating mode of the air conditioner 10, so that the air conditioner 10 can still perform heating while defrosting is performed.
According to the air conditioner 10 of the embodiment of the present invention, the flow control valve 710 is disposed between the heat exchanging part 510 and the outlet 120 of the compressor 100, so that the flow control valve 710 can be controlled to be opened after the outdoor heat exchanger 500 is frosted, so that the refrigerant is defrosted in the heat exchanging part 510. Meanwhile, when the partial heat exchanging part 510 is defrosted in the air conditioner 10, the remaining heat exchanging parts 510 are adapted to perform a heating mode, so that the heating mode can be performed in the air conditioner 10 when the air conditioner 10 is defrosted, thereby improving the feeling of use of the air conditioner 10 when the air conditioner 10 is defrosted.
In some embodiments, as shown in fig. 1 and 2, the at least two heat exchanging portions 510 are arranged in an up-down direction, and the controller is further configured to: when the defrosting mode is operated, the outdoor fan is turned off, and the at least two flow control valves 710 are sequentially opened according to the sequence of the corresponding heat exchanging parts 510 from top to bottom until the defrosting of all the at least two heat exchanging parts 510 is completed. It is understood that, when the flow control valve block 700 is operated, the flow control valve 710 corresponding to the upper heat exchanging part 510 may be controlled to be opened earlier than the flow control valve 710 corresponding to the lower heat exchanging part 510. In this way, at least two heat exchanging portions 510 are arranged in the vertical direction, and the flow control valves 710 corresponding to the heat exchanging portions 510 are adapted to be sequentially opened in the vertical direction, so that the heat exchanging portions 510 are defrosted in the vertical direction. Meanwhile, since the heat exchange portion 510 on the upper side preferentially defrosts, the defrosted water drops are suitable for falling onto the heat exchange portion 510 located below along the direction from top to bottom, so that the efficiency of the heat exchange portion 510 on the lower side during defrosting is improved, and the defrosting efficiency and the defrosting effect of the air conditioner 10 are improved.
In some embodiments, the controller is further configured to: when the defrosting mode is operated, the outdoor fan is closed, and the flow control valve corresponding to the upper heat exchanging part 510 is opened until the upper heat exchanging part 510 finishes defrosting; the outdoor fan is turned on, the flow control valve 710 corresponding to the upper heat exchanging part 510 is turned off, and the preset time is maintained; the outdoor fan is turned off, and the flow control valve 710 corresponding to the lower heat exchanging part 510 is opened until the lower heat exchanging part 510 completes defrosting.
Thus, when the air conditioner 10 is controlled to perform the defrosting mode, the outdoor fan is controlled to be turned off, so that the flow rate of the air flowing through the outdoor heat exchanger 500 during heat exchange is reduced, because the heat exchange capacity of the refrigerant in the heating mode performed in the outdoor heat exchanger 500 is reduced at this time, the reduction of the flow rate of the air allows the heat exchange capacity of the outdoor heat exchanger 500 to satisfy the heat exchange capacity required by the refrigerant, and thus the heat exchange capacity that the refrigerant can perform in the outdoor heat exchanger 500 can satisfy the operation of the indoor heat exchanger 300 of the air conditioner 10 during the heating mode, and thus when the air conditioner 10 performs the defrosting mode, the indoor heat exchanger 300 can still perform heating, so that the use feeling of the user using the air conditioner 10 is improved.
Meanwhile, after the defrosting mode is performed on a certain heat exchanging portion 510, energy of the refrigerant that circulates in the air conditioner 10 is consumed to a high degree, and therefore, after the defrosting mode is performed on a certain heat exchanging portion 510 in the air conditioner 10, the air conditioner 10 may be controlled to perform the heating mode for a predetermined time, so that energy contained in the refrigerant that circulates in the air conditioner 10 is increased, and thus, defrosting of the subsequent heat exchanging portion 510 is facilitated.
After the air conditioner 10 is controlled to the heating mode until the preset time is met, the refrigerant flowing through the air conditioner 10 has a certain energy to meet the subsequent defrosting of the heat exchanging portion 510, and the air conditioner 10 may be controlled to the defrosting mode. Thereafter, the air conditioner 10 is controlled to repeat the above operations until the outdoor heat exchanger 500 has completed defrosting.
In some embodiments, the controller is further configured to: in the defrosting mode, the outdoor fan is turned on, the flow control valve 710 corresponding to the upper heat exchanging part 510 is turned off, and is maintained for a predetermined time, and the outdoor fan is turned off, the flow control valve 710 corresponding to the lower heat exchanging part 510 is turned on until the lower heat exchanging part 510 finishes defrosting, and the operation is repeated until the lowermost heat exchanging part 510 finishes defrosting.
It can be understood that, according to the different sizes and heat exchange capacities of the outdoor heat exchangers 500 corresponding to different types of air conditioners 10, the outdoor heat exchanger 500 can be divided into at least two heat exchange portions 510, and the defrosting is performed in the direction from top to bottom, and the moisture generated during the defrosting process flows onto the heat exchange portion 510 located below under the action of gravity, so that the subsequent heat exchange portions 510 are defrosted more easily and reliably, and the defrosting efficiency is higher.
In some embodiments, the flow ratio of the flow control valve 710 above the throttle 400 is W1, and W1 satisfies the relationship: w1 is more than or equal to 20 percent and less than or equal to 25 percent; the flow rate ratio between the flow rate control valve 710 corresponding to the lowermost heat exchanging portion 510 and the throttle device 400 is W2, and W2 satisfies the relationship: w2 is more than or equal to 30 percent and less than or equal to 35 percent.
It can be understood that the refrigerant flow path corresponding to the lowest heat exchange portion 510 is longer than the refrigerant flow path of the heat exchange portion 510 located above the lowest heat exchange portion, and thus, more refrigerant needs to be circulated therein to obtain the same defrosting effect as the heat exchange portion 510 located above the lowest heat exchange portion.
In some embodiments, the outdoor heat exchanger 500 further includes: and the supercooling heat exchanging part 520, one end of the supercooling heat exchanging part 520 being connected to the throttling device 400 and the other end being connected to one ends of the at least two heat exchanging parts 510, the supercooling heat exchanging part 520 being connected between the lowermost heat exchanging part 510 and the corresponding flow control valve 710. It should be noted that, when the air conditioner 10 performs defrosting, because part of the high-temperature and high-pressure refrigerant is introduced into the heat exchanging portion 510 for defrosting, and energy of the rest of the refrigerant is insufficient when performing the heating mode, an over-cooling heat exchanging portion 520 may be disposed in the outdoor heat exchanger 500, so that energy of the refrigerant passing through the over-cooling heat exchanging portion is suitable for being improved, and thus, the capacity of the refrigerant entering the rest of the heat exchanging portion 510 for exchanging heat is improved, and thus, a heat exchanging effect is improved.
In some embodiments, the predetermined time is t, and t satisfies the relationship: t is more than or equal to 30s and less than or equal to 180 s. It can be understood that, after the heat exchange is performed on a part of the heat exchanging part 510 in step S32, the energy of the refrigerant flowing through the compressor 100 is insufficient, which may affect the use of the air conditioner 10, and therefore, the air conditioner 10 needs to be operated in a heating mode for a certain period of time so that the refrigerant can store enough energy to be used. Of course, the accumulation time is not easily too long or too short, and if the accumulation time is too short, a sufficient amount of energy cannot be accumulated in the refrigerant to satisfy the use of the air conditioner 10, which may affect the use of the air conditioner 10, and if the accumulation time is too long, energy may be wasted. Therefore, the preset time can be set to 30s to 180s, a certain amount of energy can be stored in the refrigerant to meet the use requirement, and the cost of the air conditioner 10 in storing energy is relatively low.
According to the control method of the air conditioner 10 of the embodiment of the present invention, the air conditioner 10 includes: compressor 100, four-way valve 200, indoor heat exchanger 300, throttling arrangement 400, outdoor heat exchanger 500, outdoor fan and flow control valves 700, outdoor heat exchanger 500 includes: at least two heat exchanging portions 510, at least two heat exchanging portions 510 are connected in parallel, one end of at least two heat exchanging portions 510 is connected with the throttling device 400 and the other end is connected with the four-way valve 200, and the flow control valve block 700 includes: at least two flow control valves 720, the at least two flow control valves 720 being connected between the outlets of the compressors 100 and the corresponding heat exchange parts 510, respectively;
the control method of the air conditioner 10, as shown in fig. 3, includes the steps of:
s1, starting the air conditioner 10;
s2, operating the heating mode, wherein the refrigerant flows through the compressor 100, the four-way valve 200, the indoor heat exchanger 300, the throttle device 400, the outdoor heat exchanger 500, the four-way valve 200, and the compressor 100 in sequence;
s3, when the air conditioner 10 satisfies the defrosting condition, the defrosting mode is operated: the outdoor fan is turned off, and the at least two flow control valves 710 are opened in a preset manner until the at least two heat exchanging parts 510 are completely defrosted.
It should be noted that during the heating mode operation of the air conditioner 10, the interior of the outdoor heat exchanger 500 is adapted to absorb heat and frost is formed on the outdoor heat exchanger 500. Thus, when the air conditioner 10 meets the defrosting condition, the air conditioner 10 is suitable for operating the defrosting mode, the outdoor fan is turned off, the flow control valve 710 is suitable for being opened according to a preset mode, and the high-temperature and high-pressure refrigerant is introduced into the heat exchanging part 510 to release heat on the heat exchanging part 510, so that the defrosting process of the outdoor heat exchanger 500 can be performed.
In some embodiments, at least two heat exchanging portions 510 are arranged in an up-down direction; the defrost mode includes: the outdoor fan is turned off, and the at least two flow control valves 710 are sequentially opened according to the sequence of the corresponding heat exchange portions 510 from top to bottom until the at least two heat exchange portions 510 completely defrost.
Thus, since the at least two heat exchanging portions 510 are arranged in the vertical direction, the flow control modes corresponding to the two heat exchanging portions 510 can be suitable for being opened in the sequence from top to bottom, so that the heat exchanging portion 510 above is preferentially defrosted compared with the heat exchanging portion 510 below, and after defrosting of the heat exchanging portion 510 above, water drops can flow to the heat exchanging portion 510 below, so that defrosting of the heat exchanging portion 510 below is facilitated, and defrosting efficiency is improved.
In some embodiments, as shown in fig. 4, the defrost mode includes:
s31, the outdoor fan is turned off, and the flow control valve 710 corresponding to the upper heat exchanging part 510 is opened until the upper heat exchanging part 510 completes defrosting; after the flow rate control valve 710 corresponding to the upper heat exchanging part 510 is opened, the refrigerant is introduced into the upper heat exchanging part 510 through the opened flow rate control valve 710, so that the heat in the refrigerant is suitable to be applied to the upper heat exchanging part 510, thereby defrosting the frost on the heat exchanging part 510.
S32, the outdoor fan is turned on, the flow control valve 710 corresponding to the upper heat exchanging portion 510 is turned off, and the predetermined time is maintained; it can be understood that, after the upper heat exchanging part 510 completes defrosting, the energy of the refrigerant circulating in the air conditioner 10 is relatively small. In this way, after the upper heat exchanging unit 510 is defrosted, the flow rate control valve 710 of the corresponding heat exchanging unit 510 is closed to accumulate energy circulating in the air conditioner 10, thereby facilitating defrosting of the subsequent heat exchanging unit 510.
S33, the outdoor fan is turned off, and the flow control valve 710 corresponding to the lower heat exchanging portion 510 is opened until the lower heat exchanging portion 510 completes defrosting. In this way, after the flow control valve 710 corresponding to the lower heat exchanging portion 510 is opened, the refrigerant is introduced into the lower heat exchanging portion 510 through the opened flow control valve 710, so that the heat in the refrigerant is suitable to be applied to the lower heat exchanging portion 510, thereby defrosting the frost on the heat exchanging portion 510.
In some embodiments, as shown in fig. 4, the defrost mode further comprises: and S34, repeating the steps S32 and S33 until the defrosting of the lowermost heat exchanging part 510 is completed. It is understood that, since the air conditioners 10 are adapted differently, the outdoor heat exchanger 500 may be divided into a plurality of heat exchanging parts 510 and defrosted in order from top to bottom according to the different kinds of outdoor heat exchangers 500 provided in the different air conditioners 10. Thus, the outdoor heat exchanger 500 is divided into the plurality of heat exchanging portions 510, and defrosting is performed, so that a more reliable defrosting effect can be performed on the outdoor heat exchanger 500, the influence on the heating mode when the air conditioner 10 operates in the defrosting mode can be reduced, and the use feeling of the air conditioner 10 can be improved.
In some specific embodiments, the outdoor heat exchanger 500 further includes: an supercooling heat exchanging portion 520, wherein the supercooling heat exchanging portion 520 is positioned below the lowermost heat exchanging portion 510, and the supercooling heat exchanging portion 520 is connected between the lowermost heat exchanging portion 510 and the corresponding flow control valve 710;
in step S31, the flow rate ratio between the corresponding flow rate control valve 710 and the throttle device 400 is W1, and W1 satisfies the relationship: w1 is more than or equal to 20 percent and less than or equal to 25 percent;
in step S34, the flow rate ratio between the flow rate control valve 710 and the throttle device 400 corresponding to the lowermost heat exchanger 510 is W2, and W2 satisfies the relationship: w2 is more than or equal to 30 percent and less than or equal to 35 percent.
It can be understood that the lowermost heat exchanging portion 510 is adapted to be connected to the supercooling heat exchanging portion 520 such that a path through which the refrigerant circulating through the corresponding lowermost heat exchanging portion 510 flows is larger than a path through which the refrigerant circulating through the upper heat exchanging portion 510 flows. In this way, the flow rate ratio W2 between the flow rate control valve 710 and the throttle device 400 corresponding to the lowermost heat exchanging unit 510 is greater than the flow rate ratio W1 between the flow rate control valve 710 and the throttle device 400 corresponding to the lowermost heat exchanging unit 510, so that the air conditioner 10 can be used in the defrosting mode and the heating mode of the air conditioner 10 can be used with a high feeling.
In some specific embodiments, in step S32, the predetermined time t is t, and t satisfies the relation: t is more than or equal to 30s and less than or equal to 180 s.
It can be understood that, after the heat exchange is performed on a part of the heat exchanging part 510 in step S32, the energy of the refrigerant flowing through the compressor 100 is insufficient, which may affect the use of the air conditioner 10, and therefore, the air conditioner 10 needs to be operated in a heating mode for a certain period of time so that the refrigerant can store enough energy to be used. Of course, the accumulation time is not easily too long or too short, and if the accumulation time is too short, a sufficient amount of energy cannot be accumulated in the refrigerant to satisfy the use of the air conditioner 10, which may affect the use of the air conditioner 10, and if the accumulation time is too long, energy may be wasted. Therefore, the preset time can be set to 30s to 180s, a certain amount of energy can be stored in the refrigerant to meet the use requirement, and the cost of the air conditioner 10 in storing energy is relatively low.
As shown in fig. 3 and 4, in the control method of the air conditioner 10 according to the present application, the air conditioner 10 is adapted to operate in a heating mode, and when a refrigerant passes through the outdoor heat exchanger 500, the refrigerant is adapted to absorb heat so as to be frosted on the outdoor heat exchanger 500, and a defrosting process needs to be performed on the outdoor heat exchanger 500, so that the air conditioner 10 performs a defrosting mode.
In the defrosting mode, the flow control valve 710 corresponding to the uppermost heat exchange unit 510 in the air conditioner 10 is opened, and the refrigerant flowing out of the compressor 100 is suitable for flowing through the flow control valve 710 and entering the uppermost heat exchange unit 510, and since the refrigerant flowing through the compressor 100 generally has high energy, heat can be released after entering the heat exchange unit 510, so that frost hanging on the uppermost heat exchange unit 510 is melted and removed.
After the defrosting process of the uppermost heat exchanging portion 510 is completed, the corresponding flow control valve 710 may be closed to allow the refrigerant to accumulate energy therein, so as to facilitate the subsequent defrosting process of the heat exchanging portion 510.
After enough heat is accumulated in the refrigerant, the flow control valve 710 corresponding to the heat exchanging portion 510 at the lower side of the uppermost portion is adapted to be opened, so that the refrigerant enters the corresponding heat exchanging portion 510 through the flow control valve 710 to be defrosted.
The above operations are repeated until the defrosting process is performed on the lowermost heat exchanging portion 510. At this time, the corresponding flow control valve 710 is opened, and the refrigerant flowing out of the compressor 100 is suitable for flowing through the corresponding flow control valve 710, passes through the supercooling heat exchange portion 520, enters the heat exchange portion 510 at the lowermost portion, flows through all the heat exchange portions 510 from bottom to top, and returns to the compressor 100, so as to perform an overall defrosting process on the outdoor heat exchanger 500, to ensure that each portion of the outdoor heat exchanger 500 has been subjected to the defrosting process, and thus the air conditioner 10 is returned to the heating mode to operate.
Meanwhile, in the air conditioner 10 in the above-mentioned defrosting mode, a part of the refrigerant is still suitable for flowing into the indoor heat exchanger 300 after flowing out of the compressor 100 to form a heating mode of the air conditioner 10, so that when the air conditioner 10 performs the defrosting mode, the air conditioner 10 is also suitable for performing the heating mode, and the air conditioner 10 can still operate the heating mode when operating the defrosting mode, so that the indoor environment is comfortable.
Other constructions and operations of the air conditioner 10 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An air conditioner, comprising:
a compressor driving a refrigerant to circulate, the compressor having an inlet and an outlet;
a four-way valve through which the refrigerant flows in and out to guide the flow of the refrigerant, wherein the four-way valve is connected to the inlet and the outlet, respectively;
the indoor heat exchanger is connected with the four-way valve;
the throttling device is connected with the indoor heat exchanger;
an outdoor heat exchanger that performs heat exchange between a refrigerant and outdoor air when the compressor heats, the outdoor heat exchanger including: at least two heat exchange parts, wherein the at least two heat exchange parts are connected in parallel, one end of each heat exchange part is connected with the throttling device, and the other end of each heat exchange part is connected with the four-way valve;
the outdoor fan is arranged on one side of the outdoor heat exchanger; and
a flow control valve block, the flow control valve block comprising: at least two flow control valves respectively connected between the outlet of the compressor and the corresponding heat exchanging part;
a controller configured to:
running a heating mode, wherein the refrigerant circulates along the compressor, the four-way valve, the indoor heat exchanger, the throttling device, the outdoor heat exchanger, the four-way valve and the compressor in sequence;
when the air conditioner meets the defrosting condition, operating a defrosting mode: and the outdoor fan is closed, and at least two flow control valves are opened according to a preset mode until all the at least two heat exchange parts finish defrosting.
2. The air conditioner according to claim 1, wherein at least two of the heat exchanging parts are arranged in an up-down direction;
the controller is further configured to:
when the defrosting mode is operated, the outdoor fan is closed, and the at least two flow control valves are sequentially opened according to the sequence of the corresponding heat exchange parts from top to bottom until the at least two heat exchange parts complete defrosting.
3. The air conditioner of claim 2, wherein the controller is further configured to:
when the defrosting mode is operated, the outdoor fan is closed, the flow control valve corresponding to the heat exchanging part above is opened until the heat exchanging part above completes defrosting;
the outdoor fan is started, the flow control valve corresponding to the heat exchanging part above is closed, and the preset time is maintained;
and the outdoor fan is closed, the flow control valve corresponding to the heat exchange part below is opened until the heat exchange part below completes defrosting.
4. The air conditioner of claim 3, wherein the controller is further configured to:
when the defrosting mode is operated, the outdoor fan is started, the flow control valve corresponding to the upper heat exchanging part is closed, the preset time is maintained, the outdoor fan is closed, the flow control valve corresponding to the lower heat exchanging part is opened until the lower heat exchanging part finishes defrosting, and the operation is repeated until the lowest heat exchanging part finishes defrosting.
5. The air conditioner of claim 4, wherein the controller is further configured to:
the flow ratio of the flow control valve and the throttling device at the upper part is W1, and W1 satisfies the relation: w1 is more than or equal to 20 percent and less than or equal to 25 percent;
the flow rate ratio of the flow rate control valve corresponding to the lowermost heat exchanging portion to the throttling device is W2, and W2 satisfies the relation: w2 is more than or equal to 30 percent and less than or equal to 35 percent.
6. The air conditioner of claim 4, wherein the outdoor heat exchanger further comprises: the flow control valve is arranged between the throttling device and the flow control valve, one end of the throttling device is connected with the throttling device, the other end of the throttling device is connected with at least two ends of the heat exchanging part, and the supercooling heat exchanging part is connected to the bottommost heat exchanging part and the corresponding flow control valve.
7. A control method of an air conditioner, characterized in that the air conditioner comprises: compressor, cross valve, indoor heat exchanger, throttling arrangement, outdoor heat exchanger, outdoor fan and flow control valves, outdoor heat exchanger includes: at least two heat transfer portions, at least two heat transfer portion parallel connection, at least two the one end of heat transfer portion with throttling arrangement is connected and the other end with the cross valve is connected, the flow control valves includes: at least two flow control valves respectively connected between the outlet of the compressor and the corresponding heat exchanging part;
the control method comprises the following steps:
s1, starting the air conditioner;
s2, operating a heating mode, wherein the refrigerant circulates along the compressor, the four-way valve, the indoor heat exchanger, the throttling device, the outdoor heat exchanger, the four-way valve and the compressor in sequence;
and S3, when the air conditioner meets the defrosting condition, operating a defrosting mode: and the outdoor fan is closed, and at least two flow control valves are opened according to a preset mode until all the at least two heat exchange parts finish defrosting.
8. The control method of an air conditioner according to claim 7, wherein at least two of the heat exchanging parts are arranged in an up-down direction;
the defrost mode includes:
and the outdoor fan is closed, and the at least two flow control valves are sequentially opened according to the sequence of the corresponding heat exchange parts from top to bottom until the at least two heat exchange parts complete defrosting.
9. The control method of an air conditioner according to claim 8, wherein the defrost mode includes:
s31, the outdoor fan is closed, the flow control valve corresponding to the heat exchanging part above is opened until the heat exchanging part above completes defrosting;
s32, the outdoor fan is started, the flow control valve corresponding to the heat exchanging part above is closed, and the preset time is maintained;
and S33, the outdoor fan is closed, the flow control valve corresponding to the heat exchange part below is opened until the heat exchange part below completes defrosting.
10. The control method of an air conditioner according to claim 9, wherein the defrost mode further comprises:
and S34, repeating the step S32 and the step S33 until the lowest heat exchange part finishes defrosting.
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| CN202210188462.5A CN114370692A (en) | 2022-02-28 | 2022-02-28 | Air conditioner and control method thereof |
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| CN202210188462.5A CN114370692A (en) | 2022-02-28 | 2022-02-28 | Air conditioner and control method thereof |
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Application publication date: 20220419 |