CN110207278B - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN110207278B CN110207278B CN201910452462.XA CN201910452462A CN110207278B CN 110207278 B CN110207278 B CN 110207278B CN 201910452462 A CN201910452462 A CN 201910452462A CN 110207278 B CN110207278 B CN 110207278B
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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
- 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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides an air conditioner and a control method of the air conditioner, and the air conditioner comprises a compressor, an indoor unit, an outdoor unit and a first throttling device, wherein the compressor, the indoor unit, the outdoor unit and the first throttling device are connected into an air conditioning loop; the outdoor unit comprises N outdoor heat exchangers connected in parallel, a first pipeline, a second pipeline and a first control device are correspondingly arranged on any outdoor heat exchanger, and N is not less than 2; the first end of the first pipeline is connected with the first port of the corresponding outdoor heat exchanger, and the second end of the first pipeline is connected with the first throttling device; the first end of the second pipeline is connected with the first port of the corresponding outdoor heat exchanger, and the second end of the second pipeline is connected with the exhaust port of the compressor; and the first control device is used for controlling the opening and closing of the second pipeline corresponding to the same outdoor heat exchanger. The air conditioner and the control method provided by the application realize defrosting with frost and defrosting without frost, improve defrosting efficiency and save heat consumption.
Description
Technical Field
The present disclosure relates to the field of air conditioners, and more particularly, to an air conditioner and a control method of the air conditioner.
Background
When the air conditioner operates in winter for heating, heat is released from the indoor unit and absorbed from the outdoor unit, so when the air conditioner operates in a heating mode for a long time, the outdoor unit frosts, the outdoor unit needs to be defrosted for defrosting the outdoor unit, in the prior art, the air conditioner operates in a cooling mode when defrosting is performed, at the moment, the indoor temperature is reduced, and the user experience is low.
In the prior art, an outdoor heat exchanger is a whole, when an outdoor unit frosts, frosting conditions of different areas on the outdoor heat exchanger are different, a refrigerant sequentially flows through the whole heat exchanger during defrosting, a defrosting process is not emphasized, defrosting is not needed in the areas without frosting, the refrigerant does not release heat in the areas without frosting, areas with severe frosting need to be subjected to key defrosting, and the refrigerant does not release heat in the areas with severe frosting in a centralized manner, so that the defrosting efficiency is low.
Disclosure of Invention
The present application provides an air conditioner and a control method of the air conditioner to at least partially solve the above problems.
In order to solve the above problems, as one aspect of the present application, there is provided an air conditioner including a compressor, an indoor unit, an outdoor unit, and a first throttling device connected to form an air conditioning circuit, the first throttling device being disposed between the indoor unit and the outdoor unit;
the outdoor unit comprises N outdoor heat exchangers connected in parallel, a first pipeline, a second pipeline and a first control device are correspondingly arranged on any outdoor heat exchanger, and N is not less than 2;
the first end of the first pipeline is connected with the first port of the corresponding outdoor heat exchanger, and the second end of the first pipeline is connected with the first throttling device;
the first end of the second pipeline is connected with the first port of the corresponding outdoor heat exchanger, and the second end of the second pipeline is connected with the exhaust port of the compressor;
and the first control device is used for controlling the opening and closing of the second pipeline corresponding to the same outdoor heat exchanger.
Optionally, the method further includes: the first end of the bypass pipeline is connected with the exhaust port of the compressor, the second end of each second pipeline is connected with the second end of the bypass pipeline, and the second pipelines are connected to the exhaust port of the compressor through the bypass pipeline;
and a second throttling device is arranged on the by-pass pipeline, and/or a control valve is arranged on the by-pass pipeline.
Optionally, the first control device is further configured to control opening and closing of the first pipelines corresponding to the same outdoor heat exchanger;
and/or the first control device is also used for controlling the opening and closing of the corresponding outdoor heat exchanger.
Optionally, the first control device is a first three-way valve;
a first connecting port of the first three-way valve is connected with a first port of the corresponding outdoor heat exchanger;
the second connecting port of the first three-way valve is connected with the first end of the first pipeline corresponding to the same outdoor heat exchanger;
and a third connecting port of the first three-way valve is connected with a first end of a second pipeline corresponding to the same outdoor heat exchanger.
Optionally, the method further includes:
any outdoor heat exchanger is correspondingly provided with a third pipeline, a fourth pipeline and a second control device;
the first end of the third pipeline is connected with the second port of the outdoor heat exchanger, a one-way valve is arranged on the third pipeline, and the refrigerant can only flow to the second end from the first end of the third pipeline;
the fourth pipeline is connected with the third pipeline in parallel, and the first end of the fourth pipeline is connected with the second port of the outdoor heat exchanger;
and the second control device is in contact with the third pipeline and the fourth pipeline and is used for controlling the opening and closing of the third pipeline and the fourth pipeline corresponding to the same outdoor heat exchanger.
The present application further provides a control method of an air conditioner, for controlling any one of the air conditioners provided by the present application, including:
a detection step, namely determining a target heat exchanger needing defrosting;
a defrosting step, controlling the air conditioner to operate in a heating mode, and controlling a target heat exchanger to defrost;
when the target heat exchanger is defrosted, the first control device corresponding to the target heat exchanger opens the second pipeline corresponding to the target heat exchanger so that the refrigerant discharged from the exhaust port of the compressor flows into the target heat exchanger through the second pipeline for defrosting, and the first control device is controlled so that the second pipeline corresponding to the outdoor heat exchanger which is not required to be defrosted is closed.
Optionally, when the first control device is further configured to control opening and closing of the first pipeline corresponding to the same outdoor heat exchanger, the control method further includes:
when the target heat exchanger is defrosted, the first control device corresponding to the target heat exchanger closes the first pipeline corresponding to the same target heat exchanger, so that the refrigerant cannot flow into the target heat exchanger through the first pipeline.
Optionally, the detecting step further includes: determining a defrosting mode corresponding to each target heat exchanger;
the defrosting step also comprises: controlling the target heat exchanger to enter a corresponding defrosting mode;
wherein, the defrosting mode includes: a first frost removal mode and a second frost removal mode;
the refrigerant flow of the first defrosting mode is larger than that of the second defrosting mode, and/or the defrosting time of the first defrosting mode is longer than that of the second defrosting mode.
Optionally, the detecting step includes;
monitoring the outdoor temperature and the pipe temperature of each outdoor heat exchanger;
and determining a target heat exchanger needing defrosting and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger.
Optionally, determining a target heat exchanger to be defrosted and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger, including:
when the outdoor temperature is higher than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is higher than the defrosting action temperature Tj, each outdoor heat exchanger does not need to be defrosted;
and/or when the outdoor temperature is greater than the outdoor temperature threshold value, if the tube temperature of at least one outdoor heat exchanger is not greater than the defrosting action temperature Tj and the tube temperature of at least one outdoor heat exchanger is greater than the defrosting action temperature Tj, determining that the outdoor heat exchanger with the tube temperature not greater than the defrosting action temperature Tj is a first-class target heat exchanger, and acquiring the outdoor heat exchanger with the minimum tube temperature from the outdoor heat exchangers with the tube temperature greater than the defrosting action temperature Tj as a second-class target heat exchanger;
and/or when the outdoor temperature is greater than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is not greater than the defrosting action temperature Tj, determining all the outdoor heat exchangers as first-class target heat exchangers;
the first type of target heat exchanger corresponds to a first defrosting mode, and the second type of target heat exchanger corresponds to a second defrosting mode.
Optionally, determining a target heat exchanger to be defrosted and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger, including:
when the outdoor temperature is not greater than the outdoor temperature threshold, if the average Tp of the pipe temperatures of the heat exchangers is not greater than the average threshold Td, determining the outdoor heat exchangers as first-class target heat exchangers;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold, the average Tp of the tube temperatures of the heat exchangers is more than the average Td, and the absolute value of the tube temperature difference value between the outdoor heat exchanger with the highest tube temperature and the outdoor heat exchanger with the lowest tube temperature is not more than the maximum allowable tube temperature difference Tc, defrosting is not required to be carried out on each heat exchanger;
and/or the presence of a gas in the gas,
when the outdoor temperature is not greater than an outdoor temperature threshold, the average Tp of the tube temperatures of all the heat exchangers is greater than an average threshold Td, and the absolute value of the difference value between the highest tube temperature and the lowest tube temperature is greater than a maximum allowable tube temperature difference Tc, obtaining the growth rate a of the absolute value of the tube temperature difference value between the outdoor heat exchanger with the highest tube temperature and the outdoor heat exchanger with the lowest tube temperature in the previous n minutes, and if a is less than a growth rate threshold f, all the outdoor heat exchangers do not need defrosting;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold value, the average value Tp of the pipe temperatures of the heat exchangers is more than the average value threshold value Td, and the absolute value of the difference value between the highest pipe temperature and the lowest pipe temperature is more than the maximum allowable pipe temperature difference Tc, acquiring the growth rate a of the absolute value of the pipe temperature difference value between the outdoor heat exchanger with the highest pipe temperature and the outdoor heat exchanger with the lowest pipe temperature in the first N minutes
If a is not less than the growth rate threshold value f, sequencing the outdoor heat exchangers according to the temperature of the tubes from low to high to obtain a heat exchanger sequence, sequentially arranging the first outdoor heat exchanger, the second outdoor heat exchanger, the third outdoor heat exchanger and the fourth outdoor heat exchanger according to the temperature of the tubes from low to high, obtaining the growth rate b of the absolute value of the temperature difference value between the third outdoor heat exchanger and the fourth outdoor heat exchanger in the first n minutes, obtaining the growth rate c of the absolute value of the temperature difference value between the second outdoor heat exchanger and the third outdoor heat exchanger in the first n minutes, and obtaining the growth rate d of the absolute value of the temperature difference value between the first outdoor heat exchanger and the second outdoor heat exchanger in the first n minutes;
if b is less than a/3, c is less than a/3 and d is more than or equal to a/3, determining that the first outdoor heat exchanger is a first type of target heat exchanger and the second outdoor heat exchanger is a second type of target heat exchanger; alternatively, the first and second electrodes may be,
if b is less than a/3 and c is more than or equal to a/3, determining that the first outdoor heat exchanger and the second outdoor heat exchanger are first type target heat exchangers and the second outdoor heat exchanger is a second type target heat exchanger
If b is more than or equal to a/3, determining that the first outdoor heat exchanger, the second outdoor heat exchanger and the third outdoor heat exchanger are first type target heat exchangers, determining that the fourth outdoor heat exchanger is a second type target heat exchanger,
the first type of target heat exchanger corresponds to a first defrosting mode, and the second type of target heat exchanger corresponds to a second defrosting mode.
The application provides an air conditioner and a control method of the air conditioner, a plurality of outdoor heat exchangers in an outdoor unit are connected in parallel, a second pipeline is arranged to connect a first port of each outdoor heat exchanger with an exhaust port of a compressor, the outdoor heat exchangers needing defrosting are defrosted, the outdoor heat exchangers needing defrosting do not defrost, accordingly, defrosting with frost is achieved, defrosting without frost is achieved, defrosting efficiency is improved, and heat consumption is saved.
Drawings
Fig. 1 is a structural diagram of an air conditioner according to an embodiment of the present application;
FIG. 2 is a flowchart illustrating a method for controlling an air conditioner according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating another method for controlling an air conditioner according to an embodiment of the present disclosure.
Reference numbers in the figures: 1. a compressor; 10. a one-way valve; 11. an exhaust port; 2. an indoor unit; 3. an outdoor unit; 30. an outdoor heat exchanger; 31. a first pipeline; 32. a second pipeline; 33. a third pipeline; 34. a fourth pipeline; 35. a temperature detection device; 41. a first throttling device; 42. a second throttling device; 51. a first control device; 52. a second control device; 6. a four-way valve; 7. a heating device; 8. a bypass line; 9. a control valve;
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art, an outdoor heat exchanger in an outdoor unit of an air conditioner is a whole, and when defrosting is performed, a high-temperature refrigerant heats the whole outdoor heat exchanger, so that targeted defrosting cannot be realized, and defrosting efficiency is low.
In order to solve the above technical problem, as shown in fig. 1, the present application proposes an air conditioner, which includes a compressor 1, an indoor unit 2, an outdoor unit 3, and a first throttling device 41 connected to form an air conditioning loop, wherein the first throttling device 41 is disposed between the indoor unit 2 and the outdoor unit 3; the air conditioner in this application can be the air conditioner that can only heat, need not to use cross valve 6 at this moment, also can be the air conditioner that can refrigerate and heat, need use cross valve 6 to commutate this moment, and concrete connected mode is prior art, does not describe herein in detail, can refer to this application attached figure 1. The outdoor unit 3 comprises N outdoor heat exchangers 30 connected in parallel, each outdoor heat exchanger 30 is correspondingly provided with a first pipeline 31, a second pipeline 32 and a first control device 51, and N is not less than 2; a first end of the first pipeline 31 is connected with a first port of the corresponding outdoor heat exchanger 30, and a second end of the first pipeline 31 is connected with the first throttling device 41; a first end of the second pipe 32 is connected to a first port of the corresponding outdoor heat exchanger 30, and a second end of the second pipe 32 is connected to the discharge port 11 of the compressor 1; and a first control device 51 for controlling the opening and closing of the second pipe 32 corresponding to the same outdoor heat exchanger 30.
With the air conditioner provided by the application, because a plurality of outdoor heat exchangers are arranged in one outdoor unit, therefore, when the outdoor unit is frosted and defrosting is needed, the frosting degree of each outdoor heat exchanger can be determined firstly, if there is a portion of the outdoor heat exchanger 30 that needs defrosting, and another portion of the outdoor heat exchanger 30 does not need defrosting, the first control device 51 controls the second pipeline 32 corresponding to the outdoor heat exchanger to be defrosted to be opened, so that the high-temperature and high-pressure refrigerant discharged from the discharge port 11 of the compressor 1 can flow into the outdoor heat exchanger to be defrosted through the second pipeline 32, for the outdoor heat exchanger 30 which does not need defrosting, the corresponding second pipeline can be closed through the first control device, thus, the high-temperature and high-pressure refrigerant discharged by the compressor 1 does not flow into the outdoor heat exchanger without defrosting, so that defrosting with frost is realized, and defrosting without frost is realized. For example, referring to fig. 1, if the uppermost outdoor heat exchanger 30 in fig. 1 needs defrosting, and the other outdoor heat exchangers do not need defrosting, the second pipeline 32 corresponding to the uppermost outdoor heat exchanger in fig. 1 is opened, the second pipelines corresponding to the other outdoor heat exchangers are closed, the air conditioner is controlled to operate in a heating mode, a part of the refrigerant discharged from the compressor 1 enters each outdoor unit after heat is released by the indoor unit 2, and another part of the refrigerant discharged from the compressor 1 enters the uppermost outdoor heat exchanger in fig. 1 through the second pipeline 32, so that defrosting is performed. Of course, the indoor unit may be turned off during defrosting, and the refrigerant directly enters the outdoor heat exchanger to be defrosted from the compressor.
In the prior art, the outdoor heat exchangers are not arranged in parallel in the outdoor unit, all the outdoor heat exchangers in the whole outdoor unit are required to be defrosted even if only part of the outdoor heat exchangers frosts, and therefore energy waste is caused.
In some optional embodiments, please continue to refer to fig. 1 (in the drawings, the bypass line 8 and the second line 32 are indicated by dashed lines only for distinguishing from the lines indicated by solid lines and for easy viewing, and arrows in the drawings indicate the flow direction of the refrigerant during defrosting), the air conditioner proposed in the present application further includes the bypass line 8, a first end of the bypass line 8 is connected to the exhaust port 11 of the compressor 1, a second end of each second line 32 is connected to a second end of the bypass line 8, and the second line 32 is connected to the exhaust port 11 of the compressor 1 through the bypass line 8; the bypass line 8 is provided with a second throttle device 42 and/or the bypass line 8 is provided with a control valve 9. The control valve is arranged on the bypass pipeline 8 to adjust the amount of refrigerant distributed to the outdoor heat exchanger needing defrosting during defrosting, and the second throttling device is arranged to adjust the pressure of the refrigerant, because when the air conditioner adopts a heating mode for defrosting, the indoor unit can still be opened, the refrigerant passes through the indoor unit and then passes through the first throttling device to become low-temperature and low-pressure refrigerant, the refrigerant directly discharged by the compressor 1 is high-temperature and high-pressure refrigerant, even if the refrigerant is still in a high-pressure state after the outdoor heat exchanger is cooled, when the high-pressure refrigerant and the low-pressure refrigerant passing through the first throttling device 41 are converged at the second port of the outdoor unit, the high-pressure refrigerant flows to the low-pressure refrigerant to block the refrigerant flowing out of the indoor unit, and meanwhile, the large air pressure difference change can generate air burst, the pipeline is easy to damage, and the service life is influenced, therefore, the second throttling device 42 is adopted to throttle the refrigerant at the pipeline to a low-pressure, therefore, the pressure and the temperature of the refrigerant converged at the second port of each outdoor heat exchanger are close, great thermal change and pressure change cannot be generated, the stable operation of the air conditioner is ensured, and the service life of the air conditioner is prolonged.
In some alternative embodiments, the first control device 51 is also used to control the opening and closing of the first pipe 31 corresponding to the same outdoor heat exchanger 30; and/or, the first control device 51 is also used for controlling the opening and closing of the corresponding outdoor heat exchanger 30. The first control device 51 may include a plurality of switching valves, for example, may include a switching valve provided on each indoor heat exchanger, may include a switching valve provided on each second pipeline, and may include a switching valve provided on each first pipeline, such that the switching valves may be solenoid valves, and may adjust the switching valves to open and close the outdoor heat exchanger, the first pipelines, and the second pipelines.
In some alternative embodiments, the first control device 51 is a first three-way valve; a first connection port of the first three-way valve is connected with a first port of the corresponding outdoor heat exchanger 30; a second connection port of the first three-way valve is connected with a first end of a first pipeline 31 corresponding to the same outdoor heat exchanger 30; a third connection port of the first three-way valve is connected to a first end of the second pipe line 32 corresponding to the same outdoor heat exchanger 30.
As shown in fig. 1, the first three-way valve has three states, one is a closed state, each connection port of the first three-way valve is closed, and the refrigerant cannot pass through the first three-way valve; the second is a conduction state of the first connection port and the second connection port, at this time, the refrigerant can flow into the outdoor heat exchanger 30 through the first pipeline 31, and the second pipeline 32 is in a blocking state, so that the refrigerant cannot flow into the outdoor heat exchanger 30 through the second pipeline 32; and thirdly, the first connecting port and the third connecting port are in a conducting state. That is, at any one time, the first connection port can be in a blocked state only, or in a state where the first connection port is in communication with one of the second connection port and the third connection port.
In some optional embodiments, the air conditioner provided by the present application further includes:
a third pipeline 33, a fourth pipeline 34 and a second control device 52 are correspondingly arranged on any outdoor heat exchanger 30; a first end of the third pipeline 33 is connected with a second port of the outdoor heat exchanger 30, the third pipeline 33 is provided with a check valve 10, and the refrigerant can only flow to the second end from the first end of the third pipeline 33;
the fourth pipeline 34 is connected in parallel with the third pipeline 33, and a first end of the fourth pipeline 34 is connected with a second port of the outdoor heat exchanger 30; and a second control device 52 which is provided in contact with the third and fourth pipes 33 and 34 and controls opening and closing of the third and fourth pipes 33 and 34 corresponding to the same outdoor heat exchanger 30.
The second control device 52 provided by the present application may be, for example, a three-way valve, or two switching valves respectively disposed on the third pipeline and the fourth pipeline, when the refrigerant in the outdoor heat exchanger 30 flows from the first port to the second port of the outdoor heat exchanger, the third pipeline 33 of the outdoor heat exchanger may be controlled to be opened, and the fourth pipeline is closed, so that the refrigerant passes through the check valve 10, and the check valve 10 may prevent backflow.
In the following, a preferred control method of the air conditioner during defrosting is described, when the air conditioner proposed in the present application performs defrosting, please refer to fig. 1, which is described by taking an example that the air conditioner includes a four-way valve, but the air conditioner may also be an air conditioner without a four-way valve, and a single heating air conditioner is adopted, when defrosting is required, a part of the high-temperature refrigerant discharged from the compressor 1 passes through the bypass pipeline 8, at this time, the control valve 9 is opened, the second throttling device 42 is opened, and the second pipeline 32 corresponding to the outdoor heat exchanger 30 requiring defrosting is controlled to be opened and the corresponding first pipeline 31 is closed, the high-temperature refrigerant enters the outdoor heat exchanger requiring defrosting through the second pipeline for defrosting, another part of the refrigerant discharged from the compressor 1 enters the indoor unit 2 through the four-way valve 1 for heat release and then enters the outdoor heat exchanger not requiring defrosting, that is to say, the refrigerant of the outdoor heat exchanger requiring defrosting only comes from the second pipeline, the refrigerant of the outdoor unit without defrosting only comes from the first pipeline, and when defrosting is carried out, the third pipeline 33 of each heat exchanger is controlled to be opened and the fourth pipeline is controlled to be closed, so that when the refrigerant in the outdoor heat exchanger needing defrosting and the refrigerant in the outdoor heat exchanger without defrosting are converged together, although pressure difference exists between the refrigerants, the refrigerant can be prevented from flowing back due to the backflow prevention effect of the check valve 10. The collected refrigerants are returned to the compressor 1 through the four-way valve 6.
In addition still need notice, the device that this application provided also can adopt traditional defrosting mode, adopt the refrigeration mode to change the frost promptly, but the air conditioner needs installation cross valve 6 this moment, in order to realize the refrigeration, when the refrigeration mode changes the frost, each second pipeline 32 all closes, the refrigerant flows into outdoor heat exchanger through cross valve 6 from compressor 1, only the outdoor heat exchanger that needs to change the frost is in the on-state, the outdoor heat exchanger that need not to change the frost is whole to be closed, then the refrigerant is at outdoor heat exchanger 30 heat release defrosting, pass through first throttling arrangement 41 and get into indoor set 2, get back to compressor 1 through cross valve 6. This application can set up heating device 7 on the pipeline between compressor 1 air inlet and cross valve 6, and heating device 7 for example can be the electrical heating module to improve the temperature of refrigerant, reduce compressor 1's load. Each outdoor heat exchanger 30 may be correspondingly provided with a temperature detection device 35 for determining the tube temperature of the outdoor heat exchanger 30, and the temperature detection device 35 may be a thermal bulb, for example.
The application also provides a control method of the air conditioner, which is used for controlling any air conditioner in the application, and the control method comprises the following steps:
a detection step, namely determining a target heat exchanger needing defrosting;
specifically, the criterion for determining whether the target heat exchanger needs defrosting may be determined according to the existing technology, for example, the pipe temperature of the outdoor heat exchanger is determined, for example, defrosting is deemed to be needed when the pipe temperature of the outdoor heat exchanger is detected to be lower than-10 ℃.
A defrosting step, controlling the air conditioner to operate in a heating mode, and controlling a target heat exchanger to defrost;
specifically, when the target heat exchanger is defrosted, the first control device corresponding to the target heat exchanger opens the second pipeline corresponding to the target heat exchanger, so that the refrigerant discharged from the exhaust port of the compressor flows into the target heat exchanger through the second pipeline for defrosting, and controls the first control device to close the second pipeline corresponding to the outdoor heat exchanger which is not required to be defrosted. It should be noted that, when defrosting, can control the refrigerant and pass through indoor set simultaneously, can heat indoor when defrosting like this, also can directly close the outdoor heat exchanger that need not to defrost certainly, the control method that this application provided adopts the mode operation of heating when defrosting, rather than the refrigeration mode, consequently can not reduce indoor temperature, only defrost to the outdoor heat exchanger that needs defrost simultaneously, avoided the waste of energy, realized having frosted just, no frost does not change.
In some optional embodiments, when the first control device is further used for controlling the opening and closing of the first pipeline corresponding to the same outdoor heat exchanger, the control method further comprises: when the target heat exchanger is defrosted, the first control device corresponding to the target heat exchanger closes the first pipeline corresponding to the same target heat exchanger, so that the refrigerant cannot flow into the target heat exchanger through the first pipeline. In this embodiment, the refrigerant of the target heat exchanger only comes from the second pipeline, so that the condition that the low-temperature refrigerant in the first pipeline enters the target heat exchanger to affect the defrosting effect is prevented. When the first control device is the first three-way valve, the first three-way valve is controlled to enable the first port of the target outdoor heat exchanger to be communicated with the second pipeline, and the first port of the target outdoor heat exchanger is not communicated with the first pipeline
In some optional embodiments, the detecting step further comprises: determining a defrosting mode corresponding to each target heat exchanger; the defrosting step also comprises: controlling the target heat exchanger to enter a corresponding defrosting mode;
specifically, the defrosting mode comprises the following steps: a first frost removal mode and a second frost removal mode; the refrigerant flow of the first defrosting mode is larger than that of the second defrosting mode, and/or the defrosting time of the first defrosting mode is longer than that of the second defrosting mode. Different outdoor heat exchangers's the degree of frosting is different, therefore prefers each outdoor heat exchanger and adopts different modes of defrosting according to the degree of frosting, and under first mode of defrosting, the refrigerant that flows into the heat transfer of target heat exchanger is more, consequently, the more target heat exchanger that frosts preferably adopts first heat transfer mode, and the less target heat exchanger that frosts adopts the second heat transfer mode, for the refrigerant volume in the control target heat exchanger, can be for setting up the control valve on each outdoor heat exchanger's the pipeline. The method for determining the defrosting mode corresponding to each outdoor heat exchanger may be to photograph, to photograph and confirm the outer surface of each outdoor heat exchanger, or to confirm the pipe temperature of the outdoor heat exchanger.
In some optional embodiments, the detecting step comprises;
monitoring the outdoor temperature and the pipe temperature of each outdoor heat exchanger;
and determining a target heat exchanger needing defrosting and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger.
Specifically, in the prior art, the tube temperature of the outdoor heat exchanger is often used to determine whether defrosting is needed, and actually, the outdoor temperature should be considered if defrosting is needed, and when the outdoor temperature is high, even if the outdoor unit frosts, defrosting is automatically performed due to the high outdoor temperature.
In some optional embodiments, determining a target heat exchanger to be defrosted and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger includes:
when the outdoor temperature is higher than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is higher than the defrosting operation temperature TjIf the outdoor heat exchangers are not frosted, the temperature of each outdoor heat exchanger is higher, and the frosting caused by the heating operation of the air conditioner is avoided, and meanwhile, the outdoor environment temperature is higher, so that the frosting caused by the natural environment is avoided;
and/or when the outdoor temperature is higher than the outdoor temperatureWhen the temperature is higher than the threshold value, if the tube temperature of at least one outdoor heat exchanger is not higher than the defrosting action temperature TjAnd the tube temperature of at least one outdoor heat exchanger is greater than defrosting action temperature TjDetermining that the tube temperature is not more than the defrosting action temperature TjThe outdoor heat exchanger is a first-class target heat exchanger, and the secondary tube temperature is greater than defrosting action temperature TjThe outdoor heat exchanger with the minimum tube temperature is obtained from the outdoor heat exchangers to be used as a second type of target heat exchanger, and the outdoor heat exchanger with the lower tube temperature exists at the moment, so defrosting is needed to be carried out to defrost the defrosting operation temperature TjDetermining a defrosting mode which should be adopted by each pipe temperature for reference;
and/or when the outdoor temperature is greater than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is not greater than the defrosting action temperature TjDetermining that all the outdoor heat exchangers are the first type of target heat exchangers, wherein the temperature of each pipe is low, which indicates that frosting is generated and frosting is serious, so that defrosting is required;
specifically, the first type of target heat exchanger corresponds to a first defrosting mode, the second type of target heat exchanger corresponds to a second defrosting mode, and the defrosting operation temperature may be-5 ℃ when the outdoor temperature threshold may be, for example, 0 ℃.
In some optional embodiments, determining a target heat exchanger to be defrosted and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger includes:
when the outdoor temperature is not more than the outdoor temperature threshold value, if the average value T of the tube temperatures of the heat exchangers is larger than the outdoor temperature threshold valuepNot greater than the mean threshold TdDetermining each outdoor heat exchanger as a first type of target heat exchanger, wherein the outdoor temperature is low and easy to frost due to natural reasons, and meanwhile, the average value of the pipe temperatures is low, which indicates that the whole pipe temperature of the outdoor unit is low and indicates that frost is formed and needs to be defrosted;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of the heat exchangerspGreater than the mean threshold value TdOutdoor heat exchanger with highest tube temperature and outdoor heat exchanger with lowest tube temperatureThe absolute value of the temperature difference value between the two tubes is not more than the maximum allowable temperature difference TcIn the process, all the heat exchangers do not need to be defrosted, at this time, although the outdoor temperature is low, the integral tube temperature of the outdoor unit is high, and the difference value between the tube temperatures is small, which indicates that the tube temperatures of all the outdoor units are not large, the temperatures are high, and defrosting is not needed;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of the heat exchangerspGreater than the mean threshold value TdAnd the absolute value of the difference value between the highest pipe temperature and the lowest pipe temperature is greater than the maximum allowable pipe temperature difference TcAnd if a is smaller than a growth rate threshold value f, all the outdoor heat exchangers do not need to be defrosted, the outdoor temperature is lower at the moment, but the overall temperature of the outdoor unit is higher, although the difference value between the highest pipe temperature and the lowest pipe temperature is larger, the growth rate is smaller, the temperature difference of all the outdoor heat exchangers in the outdoor unit does not tend to expand, the temperature tends to be stable, and defrosting is not needed.
And/or the presence of a gas in the gas,
n is 4, and when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of the heat exchangers ispGreater than the mean threshold value TdAnd the absolute value of the difference value between the highest pipe temperature and the lowest pipe temperature is greater than the maximum allowable pipe temperature difference TcThen, the growth rate a of the absolute value of the tube temperature difference between the outdoor heat exchanger with the highest tube temperature and the outdoor heat exchanger with the lowest tube temperature in the first n minutes is obtained
If a is not less than the growth rate threshold value f, sequencing the outdoor heat exchangers according to the temperature of the tubes from low to high to obtain a heat exchanger sequence, sequentially arranging the first outdoor heat exchanger, the second outdoor heat exchanger, the third outdoor heat exchanger and the fourth outdoor heat exchanger according to the temperature of the tubes from low to high, obtaining the growth rate b of the absolute value of the temperature difference value between the third outdoor heat exchanger and the fourth outdoor heat exchanger in the first n minutes, obtaining the growth rate c of the absolute value of the temperature difference value between the second outdoor heat exchanger and the third outdoor heat exchanger in the first n minutes, and obtaining the growth rate d of the absolute value of the temperature difference value between the first outdoor heat exchanger and the second outdoor heat exchanger in the first n minutes;
if b is less than a/3, c is less than a/3 and d is more than or equal to a/3, determining that the first outdoor heat exchanger is a first type of target heat exchanger and the second outdoor heat exchanger is a second type of target heat exchanger; alternatively, the first and second electrodes may be,
if b is less than a/3 and c is more than or equal to a/3, determining that the first outdoor heat exchanger and the second outdoor heat exchanger are first type target heat exchangers and the second outdoor heat exchanger is a second type target heat exchanger
If b is more than or equal to a/3, determining that the first outdoor heat exchanger, the second outdoor heat exchanger and the third outdoor heat exchanger are first type target heat exchangers, determining that the fourth outdoor heat exchanger is a second type target heat exchanger,
the first type of target heat exchanger corresponds to a first defrosting mode, and the second type of target heat exchanger corresponds to a second defrosting mode.
To better explain the scheme of the present application, another preferred embodiment is proposed below, in this embodiment, the air conditioner structure in fig. 1 is adopted, an outdoor unit includes 4 outdoor heat exchangers, each outdoor heat exchanger is regarded as a module, the tube temperature of the outdoor heat exchanger is tested by a temperature sensing bulb on the outdoor heat exchanger 30, the first defrosting mode is normal defrosting, and the second defrosting mode is slight defrosting.
As shown in fig. 3, the air conditioner system sends a defrosting command, and the control valve 9 is opened; the electronic expansion valve serving as the second throttling device 42 is adjusted to a corresponding opening degree, for a target heat exchanger needing defrosting, the first three-way valve serving as the first control device 51 is controlled, so that the refrigerant flowing into the target heat exchanger comes from the second pipeline 32, the refrigerant in the first pipeline 31 cannot enter the target heat exchanger through the first three-way valve, the air conditioner operates in a heating mode, a part of the refrigerant flows into the outdoor heat exchanger 30 without defrosting after passing through the indoor unit 2 and the first throttling device 41, and then the refrigerant of each outdoor heat exchanger 30 is converged and returned to the compressor 1.
When a target heat exchanger and a corresponding defrosting mode are determined, the temperature sensing bulb of each module detects the surface temperature of the copper pipe of the outdoor heat exchanger of each module, and the real-time monitoring temperature is T1, T2, T3 and T4 from low to high in sequence
When the outdoor temperature is higher than the outdoor temperature threshold value, the monitoring pipe temperatures T1, T2, T3 and T4 are sequentially matched with the defrosting operation temperature TjBy contrast, if T1 is less than or equal to TjIf not, all modules do not enter defrosting; if yes, continuing to judge the temperature T2, and if T2 is less than or equal to TjIf the condition is not satisfied, the corresponding module of T1 is normally defrosted, and the corresponding module of T2 is slightly defrosted; if yes, continuing to judge the temperature T3, and if T3 is less than or equal to TjIf not, the corresponding modules of T1 and T2 are normally defrosted in sequence, and the corresponding module of T3 is slightly defrosted; if yes, continuing to judge the temperature T4, and if T4 is less than or equal to TjIf not, the corresponding modules of T1, T2 and T3 are normally defrosted in sequence, and the corresponding module of T4 is slightly defrosted; if yes, the corresponding modules of T1, T2, T3 and T4 are subjected to normal defrosting in sequence
When the outdoor temperature is less than or equal to the outdoor temperature threshold value, the real-time monitoring of the outdoor unit tube temperature by the tube temperature thermal bulb of each module is sequentially T1, T2, T3 and T4 from low to high,
calculating the monitored pipe temperature difference | Δ T14 |, | Δ T12 |, | Δ T23 |, | Δ T34 |, and the average temperature T of the monitored pipe temperature of each modulep；
Will TpAnd a mean threshold value TdBy contrast, if Tp≤TdIf yes, the corresponding modules of T1, T2, T3 and T4 are subjected to normal defrosting in sequence;
if not, continuing to make |. DELTA T14 |, and maximum allowable temp. difference T between modulescComparing;
if |. DeltaT 14 |. TcIf the module is established, all modules are not subjected to low-temperature defrosting;
if not, determining the growth rate a of | Δ T14 | n minutes ahead; if a is more than f, all modules are not defrosted; if not, calculating | Δ T34 | n minutes ahead growth rate b; calculating | Δ T23 | n minutes ahead growth rate c; calculating | Δ T12 | n minutes before the increase rate d;
and comparing the calculated values of ③, c and d with a for analysis, wherein if ③ is less than a/3, c is less than a/3, d is greater than or equal to a/3, the corresponding modules of T1 are normally defrosted, the corresponding modules of T2 are slightly defrosted, if ③ is less than a/3, c is greater than or equal to a/3, the corresponding modules of T1 and T2 are normally defrosted in sequence, the corresponding modules of T3 are slightly defrosted, and if ③ is greater than or equal to a/3, the corresponding modules of T1, T2 and T3 are normally defrosted in sequence, and the corresponding modules of T4 are slightly defrosted.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The control method of the air conditioner is characterized by being used for controlling the air conditioner, wherein the air conditioner comprises a compressor (1), an indoor unit (2), an outdoor unit (3) and a first throttling device (41), which are connected into an air conditioning loop, and the first throttling device (41) is arranged between the indoor unit (2) and the outdoor unit (3);
the outdoor unit (3) comprises N outdoor heat exchangers (30) connected in parallel, each outdoor heat exchanger (30) is correspondingly provided with a first pipeline (31), a second pipeline (32) and a first control device (51), and N is not less than 2;
a first end of the first pipeline (31) is connected with a first port of the corresponding outdoor heat exchanger (30), and a second end of the first pipeline (31) is connected with the first throttling device (41);
a first end of the second pipeline (32) is connected with a first port of the corresponding outdoor heat exchanger (30), and a second end of the second pipeline (32) is connected with a gas exhaust port (11) of the compressor (1);
the first control device (51) is used for controlling the opening and closing of the second pipeline (32) corresponding to the same outdoor heat exchanger (30);
the control method comprises the following steps:
a detection step, namely determining a target heat exchanger needing defrosting;
a defrosting step, controlling the air conditioner to operate in a heating mode, and controlling the target heat exchanger to defrost;
when the target heat exchanger is defrosted, a first control device corresponding to the target heat exchanger opens a second pipeline corresponding to the target heat exchanger so that the refrigerant discharged from the exhaust port of the compressor flows into the target heat exchanger through the second pipeline for defrosting, and controls the first control device so that the second pipeline corresponding to the outdoor heat exchanger which is not required to be defrosted is closed;
the detecting step comprises;
monitoring the outdoor temperature and the pipe temperature of each outdoor heat exchanger;
determining a target heat exchanger needing defrosting and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger;
determining a target heat exchanger needing defrosting and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger, wherein the defrosting mode comprises the following steps:
when the outdoor temperature is higher than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is higher than the defrosting operation temperature TjDefrosting is not needed to be carried out on each outdoor heat exchanger;
and/or when the outdoor temperature is greater than the outdoor temperature threshold value, if the tube temperature of at least one outdoor heat exchanger is not greater than the defrosting action temperature TjAnd the tube temperature of at least one outdoor heat exchanger is greater than defrosting action temperature TjDetermining that the tube temperature is not more than the defrosting action temperature TjThe outdoor heat exchanger is a first-class target heat exchanger, and the secondary tube temperature is greater than defrosting action temperature TjThe outdoor heat exchanger with the minimum pipe temperature is obtained from the outdoor heat exchangers to be used as a second type of target heat exchanger;
and/or when the outdoor temperature is greater than the outdoor temperature threshold value, if the pipe temperature of each outdoor heat exchanger is not greater than the defrosting action temperature TjDetermining all outdoor heat exchangers as first type target heat exchangers;
the first type of target heat exchanger corresponds to a first defrosting mode, and the second type of target heat exchanger corresponds to a second defrosting mode.
2. The control method of an air conditioner according to claim 1, wherein when the first control means is further used to control opening and closing of the first piping corresponding to the same outdoor heat exchanger, the control method further comprises:
when the target heat exchanger is defrosted, the first control device corresponding to the target heat exchanger closes the first pipeline corresponding to the same target heat exchanger, so that the refrigerant cannot flow into the target heat exchanger through the first pipeline.
3. The control method of an air conditioner according to claim 1 or 2, characterized in that,
the detecting step further comprises: determining a defrosting mode corresponding to each target heat exchanger;
the defrosting step further comprises the following steps: controlling the target heat exchanger to enter a corresponding defrosting mode;
wherein the defrosting mode comprises: a first frost removal mode and a second frost removal mode;
the refrigerant flow of the first defrosting mode is larger than that of the second defrosting mode, and/or the defrosting time of the first defrosting mode is longer than that of the second defrosting mode.
4. The method for controlling the air conditioner according to claim 1, wherein determining a target heat exchanger to be defrosted and a defrosting mode corresponding to the target heat exchanger according to the outdoor temperature and the pipe temperature of each outdoor heat exchanger comprises:
when the outdoor temperature is not more than the outdoor temperature threshold value, if the average value T of the tube temperatures of the heat exchangers is larger than the outdoor temperature threshold valuepNot greater than the mean threshold TdDetermining each outdoor heat exchanger as a first type of target heat exchanger;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of all the heat exchangerspGreater than the mean threshold value TdOutdoor heat exchanger with highest tube temperature and outdoor heat exchanger with lowest tube temperatureThe absolute value of the difference between the tube temperatures of the heaters is not more than the maximum allowable tube temperature difference TcIn time, each heat exchanger does not need defrosting;
and/or the presence of a gas in the gas,
when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of all the heat exchangerspGreater than the mean threshold value TdAnd the absolute value of the difference value between the highest pipe temperature and the lowest pipe temperature is greater than the maximum allowable pipe temperature difference TcAcquiring the growth rate a of the absolute value of the tube temperature difference value between the outdoor heat exchanger with the highest tube temperature and the outdoor heat exchanger with the lowest tube temperature in the previous n minutes, wherein if a is smaller than a growth rate threshold value f, all the outdoor heat exchangers do not need to be defrosted;
and/or the presence of a gas in the gas,
n is 4, and when the outdoor temperature is not more than the outdoor temperature threshold value, the average value T of the tube temperatures of the heat exchangers ispGreater than the mean threshold value TdAnd the absolute value of the difference value between the highest pipe temperature and the lowest pipe temperature is greater than the maximum allowable pipe temperature difference TcAcquiring the growth rate a of the absolute value of the tube temperature difference value between the outdoor heat exchanger with the highest tube temperature and the outdoor heat exchanger with the lowest tube temperature in the previous n minutes;
if a is not less than the growth rate threshold value f, sequencing the outdoor heat exchangers according to the temperature of the tubes from low to high to obtain a heat exchanger sequence, sequentially arranging the first outdoor heat exchanger, the second outdoor heat exchanger, the third outdoor heat exchanger and the fourth outdoor heat exchanger according to the temperature of the tubes from low to high, obtaining the growth rate b of the absolute value of the temperature difference value between the third outdoor heat exchanger and the fourth outdoor heat exchanger in the first n minutes, obtaining the growth rate c of the absolute value of the temperature difference value between the second outdoor heat exchanger and the third outdoor heat exchanger in the first n minutes, and obtaining the growth rate d of the absolute value of the temperature difference value between the first outdoor heat exchanger and the second outdoor heat exchanger in the first n minutes;
if b is less than a/3, c is less than a/3 and d is more than or equal to a/3, determining that the first outdoor heat exchanger is a first type of target heat exchanger and the second outdoor heat exchanger is a second type of target heat exchanger; alternatively, the first and second electrodes may be,
if b is less than a/3 and c is more than or equal to a/3, determining that the first outdoor heat exchanger and the second outdoor heat exchanger are first type target heat exchangers and the second outdoor heat exchanger is a second type target heat exchanger; alternatively, the first and second electrodes may be,
if b is more than or equal to a/3, determining that the first outdoor heat exchanger, the second outdoor heat exchanger and the third outdoor heat exchanger are first type target heat exchangers, determining that the fourth outdoor heat exchanger is a second type target heat exchanger,
the first type of target heat exchanger corresponds to a first defrosting mode, and the second type of target heat exchanger corresponds to a second defrosting mode.
5. The control method according to claim 1, wherein the air conditioner further comprises:
a bypass line (8), a first end of the bypass line (8) being connected to the exhaust port (11) of the compressor (1), a second end of each of the second lines (32) being connected to a second end of the bypass line (8), the second lines (32) being connected to the exhaust port (11) of the compressor (1) through the bypass line (8);
a second throttling device (42) is arranged on the bypass pipeline (8), and/or a control valve (9) is arranged on the bypass pipeline (8).
6. The control method according to claim 5,
the first control device (51) is also used for controlling the opening and closing of the first pipeline (31) corresponding to the same outdoor heat exchanger (30);
and/or the first control device (51) is also used for controlling the opening and closing of the corresponding outdoor heat exchanger (30).
7. The control method according to claim 6,
the first control means (51) is a first three-way valve;
the first connecting port of the first three-way valve is connected with the first port of the corresponding outdoor heat exchanger (30);
a second connection port of the first three-way valve is connected with a first end of a first pipeline (31) corresponding to the same outdoor heat exchanger (30);
and a third connecting port of the first three-way valve is connected with a first end of a second pipeline (32) corresponding to the same outdoor heat exchanger (30).
8. The control method according to claim 7, wherein the air conditioner further comprises:
any outdoor heat exchanger (30) is correspondingly provided with a third pipeline (33), a fourth pipeline (34) and a second control device (52);
the first end of the third pipeline (33) is connected with the second port of the outdoor heat exchanger (30), a one-way valve (10) is arranged on the third pipeline (33), and the refrigerant can only flow from the first end to the second end of the third pipeline (33);
the fourth pipeline (34) is connected with the third pipeline (33) in parallel, and a first end of the fourth pipeline (34) is connected with a second port of the outdoor heat exchanger (30);
and the second control device (52) is arranged in contact with the third pipeline (33) and the fourth pipeline (34) and is used for controlling the opening and closing of the third pipeline (33) and the fourth pipeline (34) corresponding to the same outdoor heat exchanger (30).
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| CN111928339A (en) * | 2020-09-14 | 2020-11-13 | 珠海格力电器股份有限公司 | Outdoor unit heat exchanger, control method and control unit thereof and air conditioning system |
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