CN113154637A - Defrosting control method and device and air conditioner - Google Patents

Defrosting control method and device and air conditioner Download PDF

Info

Publication number
CN113154637A
CN113154637A CN202110538867.2A CN202110538867A CN113154637A CN 113154637 A CN113154637 A CN 113154637A CN 202110538867 A CN202110538867 A CN 202110538867A CN 113154637 A CN113154637 A CN 113154637A
Authority
CN
China
Prior art keywords
defrosting
pressure
frequency
difference
rotation speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110538867.2A
Other languages
Chinese (zh)
Other versions
CN113154637B (en
Inventor
杨振超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Original Assignee
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aux Air Conditioning Co Ltd, Ningbo Aux Electric Co Ltd filed Critical Aux Air Conditioning Co Ltd
Priority to CN202110538867.2A priority Critical patent/CN113154637B/en
Publication of CN113154637A publication Critical patent/CN113154637A/en
Application granted granted Critical
Publication of CN113154637B publication Critical patent/CN113154637B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the application provides a defrosting control method and device and an air conditioner, and relates to the technical field of air conditioners. In the defrosting control method provided by the embodiment of the application, the frosting degree of the outdoor heat exchanger can be preliminarily judged by paying attention to the pressure difference of the pressure of the high-pressure side of the compressor before entering the defrosting mode relative to the pressure when the air conditioner is started for heating, and then a proper defrosting parameter, such as the rotating speed of an external fan and/or the frequency of the compressor, can be selected in the defrosting mode, so that the air conditioner has a good defrosting effect, and the use experience of a user is improved. The defrosting control device and the air conditioner provided by the embodiment of the application are both used for realizing the defrosting control method, and therefore the defrosting control device and the air conditioner also have corresponding beneficial effects.

Description

Defrosting control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method and device and an air conditioner.
Background
At present, air conditioners in the market are heated and operated in a low-temperature environment, after an outdoor heat exchanger frosts, the operating frequency and the rotating speed of an outer fan during defrosting are determined only by the dry bulb temperature of the outside environment, the defrosting period of the air conditioner cannot be optimized, when the outside wet bulb temperature is higher, an outer unit frosts thickly, but the operating frequency and the rotating speed are lower, the defrosting time is longer, and the use experience of users is poorer.
Disclosure of Invention
The invention solves the problem that the existing defrosting control method of the air conditioner is not reasonable enough, so that the user experience is poor.
In order to solve the above problem, in a first aspect, the present invention provides a defrosting control method applied to an air conditioner, including:
after the air conditioner is heated and started, acquiring the initial pressure of the high-pressure side of the compressor;
acquiring defrosting pressure of a high-pressure side of a compressor when the air conditioner meets defrosting conditions;
determining the defrosting rotation speed of the outer fan and/or the defrosting frequency of the compressor according to the pressure difference between the defrosting pressure and the initial pressure;
and controlling the air conditioner to enter a defrosting mode, wherein in the defrosting mode, the rotating speed of the outer fan is the defrosting rotating speed and/or the frequency of the compressor is the defrosting frequency.
In the heating condition, as the frosting progress of the outdoor heat exchanger is promoted, the high-pressure side pressure of the compressor is influenced by the frosting degree. Generally, as the frost layer of the outdoor heat exchanger is gradually increased in thickness, the high-side pressure of the compressor is gradually decreased. Therefore, in the embodiment of the application, the frosting degree of the outdoor heat exchanger can be preliminarily judged by paying attention to the pressure difference of the pressure of the high-pressure side of the compressor before entering the defrosting mode relative to the pressure when the air conditioner is started for heating, and then a proper defrosting parameter, such as the rotating speed of the outer fan and/or the frequency of the compressor, can be selected in the defrosting mode, so that the air conditioner has a good defrosting effect, and the use experience of a user is improved.
In an alternative embodiment, the defrost speed is positively correlated to the pressure difference.
In this embodiment, as the air conditioner is stably operated in a heating condition, generally, the frosting thickness of the outdoor heat exchanger continuously increases, and the high-side pressure of the compressor is gradually decreased. If the pressure on the high-pressure side of the compressor (i.e., the defrosting pressure) is reduced more than the pressure after the compressor is turned on (i.e., the initial pressure) when it is determined that the defrosting condition is satisfied, it means that the frost layer may be thick and a relatively strong defrosting operation is required, and thus the rotation speed of the external fan (i.e., the defrosting rotation speed) in the defrosting mode is adjusted to a relatively high level accordingly. Conversely, if the pressure difference is small, it means that the frost layer may be thin, the required external fan rotational speed does not have to be too high, and thus the defrosting rotational speed can be controlled at a low level.
In an alternative embodiment, the defrosting speed and the pressure difference satisfy the following relationship:
when the pressure difference is smaller than the first difference value, the defrosting rotation speed is a first rotation speed;
when the pressure is between the first difference and the second difference, the defrosting rotation speed is a second rotation speed, wherein the second difference is greater than the first difference, and the second rotation speed is greater than the first rotation speed;
and when the pressure difference is greater than the second difference value, the defrosting rotation speed is a third rotation speed, wherein the third rotation speed is greater than the second rotation speed.
The defrosting rotation speed is divided into three gears of a first rotation speed, a second rotation speed and a third rotation speed, the three gears correspond to three pressure sections respectively, and the defrosting rotation speed is determined according to the pressure section where the pressure difference is located. The control logic is simple and stable and is easy to realize. But also can meet the trend that the higher the pressure difference is, the higher the defrosting rotating speed is.
In an alternative embodiment, the defrosting speed and the pressure difference satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Defrosting rotation speed R＝R0 R＝R0+aΔP R＝R0+bΔP
Wherein, Δ P is a pressure difference, P1 and P2 are respectively a first difference and a second difference, R is a defrosting rotation speed, R0 is a basic rotation speed, a and b are preset proportionality coefficients, wherein b is larger than a.
In the embodiment, three pressure sections are provided, the calculation mode of the defrosting rotation speed is determined by judging which pressure section the pressure difference is in, and the defrosting rotation speed corresponding to the pressure section with the higher pressure value is also ensured to be higher. When P1 is less than or equal to delta P less than or equal to P2, R is R0+ a delta P, which means that the defrosting speed R is still a variable in the interval [ P1, P2] and is linearly increased along with the pressure difference delta P. When Δ P > P2, R ═ R0+ b Δ P, and the defrosting speed R is also a variable and increases linearly with the pressure difference Δ P, but the proportionality coefficient b is larger than the proportionality coefficient a corresponding to [ P1, P2], meaning that a higher defrosting speed should be used when the pressure difference Δ P is large and the frost formation is thick.
In an alternative embodiment, the defrosting frequency is positively correlated to the pressure difference. Similar to the setting rule of the defrosting rotation speed, if the pressure on the high-pressure side of the compressor (namely, the defrosting pressure) is reduced more than the pressure after starting up (namely, the initial pressure) when the defrosting condition is judged to be met, the pressure means that the frost layer is possibly thicker and stronger defrosting operation is required, so that the frequency of the compressor in the defrosting mode (namely, the defrosting frequency) is correspondingly adjusted to a higher level. Conversely, if the pressure difference is small, this means that the frost layer may be thin, the frequency of the compressor required does not have to be too high, and therefore the defrosting frequency can be controlled at a lower level.
In an alternative embodiment, the defrosting frequency and the pressure difference satisfy the following relationship:
when the pressure difference is smaller than the first difference value, the defrosting frequency is a first frequency;
when the pressure is between the first difference and a second difference, the defrosting frequency is a second frequency, wherein the second difference is greater than the first difference, and the second frequency is greater than the first frequency;
when the pressure difference is larger than the second difference, the defrosting frequency is a third frequency, wherein the third frequency is larger than the second frequency.
The defrosting frequency is divided into three gears of a first frequency, a second frequency and a third frequency, the three gears correspond to three pressure sections respectively, and the defrosting frequency is determined according to the pressure section where the pressure difference is located. The control logic is simple and stable and is easy to realize. But also can meet the trend that the higher the pressure difference is, the higher the defrosting frequency is.
In an alternative embodiment, the defrosting frequency and the pressure difference satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Frequency of defrosting f＝f0 f＝f0+cΔP f＝f0+dΔP
Wherein, Δ P is pressure difference, P1 and P2 are respectively a first difference and a second difference, f is defrosting frequency, f0 is basic frequency, c and d are preset proportionality coefficients, wherein d is larger than c.
In the embodiment, three pressure sections are provided, the calculation mode of the defrosting frequency is determined by judging which pressure section the pressure difference is in, and the defrosting frequency corresponding to the pressure section with the higher pressure value is also ensured to be higher. At P1P 2, f is f0+ c Δ P, meaning that the defrost frequency f is still a variable, increasing linearly with the pressure difference Δ P, in the interval [ P1, P2 ]. When Δ P > P2, f ═ f0+ d Δ P, and the defrosting frequency f is also a variable and increases linearly with the pressure difference Δ P, but the proportionality coefficient d is larger than the proportionality coefficient c corresponding to [ P1, P2], meaning that a higher defrosting frequency should be used when the pressure difference Δ P is large and the frost formation is thick.
In an alternative embodiment, the defrosting control method further comprises:
and in the defrosting mode, if the pressure of the high-pressure side of the compressor is kept unchanged for a preset time, the defrosting mode is exited.
In the defrosting process, the high-pressure side pressure of the compressor gradually rises back along with the gradual thinning of the thickness of the frost layer. When the frost is completely removed, the high-side pressure of the compressor is stabilized. Therefore, if the high-pressure side pressure of the compressor is kept unchanged for a preset time period, the defrosting mode can be exited after the defrosting is finished and the frost layer is completely defrosted.
In an optional embodiment, the preset time is 5-30 s.
In an optional embodiment, the initial pressure of the high-pressure side of the compressor is the pressure of the high-pressure side of the compressor 0.5-3 min after the air conditioner is started for heating. The pressure of the high-pressure side of the compressor is detected as the initial pressure after a short period of time after starting, so that the problem that the initial pressure value is inaccurate due to unstable pressure of the high-pressure side of the compressor when starting is avoided.
In a second aspect, the present invention provides a defrosting control device for an air conditioner, the defrosting control device comprising:
the initial pressure acquisition module is used for acquiring the initial pressure of the high-pressure side of the compressor after the air conditioner is started in a heating mode;
the defrosting pressure acquisition module is used for acquiring the defrosting pressure of the high-pressure side of the compressor when the air conditioner meets the defrosting condition;
the parameter setting module is used for determining the defrosting rotation speed of the outer fan and/or the defrosting frequency of the compressor according to the pressure difference between the defrosting pressure and the initial pressure;
and the defrosting module is used for controlling the air conditioner to enter a defrosting mode, and under the defrosting mode, the rotating speed of the outer fan is a defrosting rotating speed and/or the frequency of the compressor is a defrosting frequency.
In a third aspect, the present invention provides an air conditioner comprising a controller for executing an executable program to implement the defrosting control method of any one of the preceding embodiments.
Drawings
FIG. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an embodiment of an air conditioner;
FIG. 3 is a flow chart of a defrosting control method according to an embodiment of the present application;
FIG. 4 is a schematic view of a defrosting control unit according to an embodiment of the present application;
fig. 5 is a block diagram of an air conditioner according to an embodiment of the present invention.
Description of reference numerals: 010-an air conditioner; 100-an outdoor unit; 110-outdoor heat exchanger; 120-a compressor; 122-a pressure sensor; a 130-four-way reversing valve; 140-an outer fan; 150-a throttling device; 200-indoor unit; 210-indoor heat exchanger; 300-a controller; 400-bus; 500-a storage medium; 600-a defrosting control device; 610-an initial pressure acquisition module; 620-defrosting pressure obtaining module; 630-parameter setting module; 640-defrosting module.
Detailed Description
In the existing market, an air conditioner is heated and operated in a low-temperature environment, after an outdoor heat exchanger frosts, the operation frequency and the rotating speed of an external fan during defrosting are only determined by the temperature of a dry bulb in the outside environment, and the defrosting period of the air conditioner cannot be optimized. When the outdoor humidity is high and the outside wet bulb temperature is high, the frost formation of the outdoor heat exchanger is thick, but the running frequency and the rotating speed of the air conditioner are low, so that the defrosting needs to be carried out for a long time. Therefore, the existing defrosting control method of the air conditioner is not reasonable enough, and the problems that the defrosting strength is not high enough and the defrosting time is long when strong defrosting is needed are often caused. In the defrosting process, the indoor space cannot be heated, and if the defrosting time is long, the comfort of a user is poor, and the use experience is seriously influenced.
In order to solve the problem that a defrosting control method in the prior art is unreasonable enough to cause poor user experience, the embodiment of the application provides a defrosting control method, and defrosting parameters are determined through the pressure variation of the high-pressure side of a compressor, so that the defrosting requirement is better met. The embodiment of the application also provides a defrosting control device and an air conditioner, which can be used for realizing the defrosting control method in the embodiment of the application.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic structural diagram of an air conditioner 010 according to an embodiment of the present application; fig. 2 is a schematic circuit control diagram of the air conditioner 010 according to an embodiment of the present disclosure. As shown in fig. 1 and 2, in the present embodiment, the air conditioner 010 includes an outdoor unit 100 and an indoor unit 200, and a loop is formed between the indoor unit 200 and the outdoor unit 100 through a pipe. The outdoor unit 100 includes an outdoor heat exchanger 110, a compressor 120, and a pressure sensor 122 for detecting a high-side pressure of the compressor 120. The indoor unit 200 includes an indoor heat exchanger 210, and the indoor heat exchanger 210 and the outdoor heat exchanger 110 form a loop through pipes for circulating a refrigerant. In this embodiment, the air conditioner 010 further includes a four-way reversing valve 130 and a throttling device 150, where the four-way reversing valve 130 is used to switch the flow direction of a refrigerant in a pipeline to switch a cooling or heating mode; the throttling device 150 is used for converting the high-pressure liquid refrigerant into the low-pressure liquid refrigerant. The solid arrows on the lines shown in fig. 1 indicate the flow direction of the refrigerant in the heating mode of the air conditioner 010, and in the heating mode, the refrigerant absorbs heat in the outdoor heat exchanger 110 and is gasified into low-pressure gas, and then flows to the compressor 120. Since the refrigerant inlet of the compressor 120 is a suction side and the pressure of the suction side is lower than that of the refrigerant outlet of the compressor 120, the suction side is a low pressure side and the refrigerant outlet side is a high pressure side. The compressor 120 and the pressure sensor 122 of the air conditioner 010 are electrically connected to the controller 300. In addition, the outdoor unit 100 further includes an external fan 140, the external fan 140 is used for enhancing heat convection between the outdoor heat exchanger 110 and the air, and the external fan 140 is also electrically connected to the controller 300. The indoor unit 200 of the air conditioner 010 provided in the embodiment of the present application may be a common cabinet air conditioner or an on-hook air conditioner, and the air conditioner 010 may also be a multi-split air conditioner.
Fig. 3 is a flowchart of a defrosting control method according to an embodiment of the present application. As shown in fig. 3, a defrosting control method provided in an embodiment of the present application includes:
and step S100, acquiring the initial pressure of the high-pressure side of the compressor after the air conditioner is heated and started.
Taking the air conditioner 010 provided in the embodiment of the present application as an example, after the air conditioner 010 is turned on while heating, the pressure sensor 122 obtains the pressure at the high pressure side of the compressor 120 as the initial pressure at the high pressure side of the compressor 120. In some embodiments, the air conditioner 010 is powered on with heating, which may be considered as the air conditioner 010 starts to operate in a heating mode; in other embodiments, the heating operation of the air conditioner 010 may include the air conditioner 010 starting to operate in a heating mode, or the air conditioner 010 switching from a non-heating mode to a heating mode.
In order to ensure that the acquired initial pressure can accurately represent the actual pressure after the heating start-up, in the embodiment of the present application, the initial pressure on the high-pressure side of the compressor 120 is the pressure on the high-pressure side of the compressor 120 0.5-3 min after the heating start-up of the air conditioner 010. For example, the pressure on the high-pressure side of the compressor 120 is collected at a time 1min after the heating start-up, and is used as the initial pressure. The pressure on the high-pressure side of the compressor 120 is detected as the initial pressure after a short time after starting, so that the problem that the initial pressure value is inaccurate due to unstable pressure on the high-pressure side of the compressor 120 when starting is avoided.
And step S200, acquiring defrosting pressure of the high-pressure side of the compressor when the air conditioner meets defrosting conditions.
Taking the air conditioner 010 provided in the embodiment of the present application as an example, when the controller 300 determines that the air conditioner 010 satisfies the defrosting condition according to the collected information, the pressure on the high pressure side of the compressor 120 is obtained as the defrosting pressure. The air conditioner 010 satisfies the defrosting condition on the premise that the air conditioner 010 enters the defrosting mode. The manner of determining whether the air conditioner 010 satisfies the defrosting condition may refer to the manner in the prior art, and is not described herein again.
And step S300, determining the defrosting rotation speed of the external fan and/or the defrosting frequency of the compressor according to the pressure difference between the defrosting pressure and the initial pressure.
According to the pressure difference between the defrosting pressure and the initial pressure, corresponding defrosting parameters are determined, and the corresponding defrosting requirements can be better met. In the present embodiment, the defrosting parameters include the rotational speed of the outer fan 140 and the frequency of the compressor 120. In this embodiment, the defrosting speed of the external fan 140 is a target speed of the external fan 140 in the defrosting mode, and the defrosting frequency of the compressor 120 is a target frequency of the compressor 120 in the defrosting mode.
Generally, as the air conditioner 010 is stably operated under a heating condition, the frost thickness of the outdoor heat exchanger 110 continuously increases, and the high-side pressure of the compressor 120 gradually decreases. If the pressure on the high pressure side of the compressor 120 (i.e., the defrosting pressure) is reduced more than the pressure after the start-up (i.e., the initial pressure) when it is determined that the defrosting condition is satisfied, it means that the frost layer may be thick and a stronger defrosting operation is required, and thus the rotation speed of the outer fan 140 (i.e., the defrosting rotation speed) in the defrosting mode is adjusted to a higher level accordingly. Conversely, if the pressure difference is small, it means that the frost layer may be thin, the required rotation speed of the outer fan 140 does not have to be too high, and thus the defrosting rotation speed can be controlled at a low level. Therefore, in the embodiment of the present application, the defrosting speed can be set to be positively correlated with the pressure difference. Similarly, the defrosting frequency can also be set to be positively correlated with the pressure difference.
In an alternative embodiment, the defrosting speed and the pressure difference satisfy the following relationship:
when the pressure difference is smaller than the first difference value, the defrosting rotation speed is a first rotation speed; when the pressure is between the first difference and the second difference, the defrosting rotation speed is a second rotation speed, wherein the second difference is greater than the first difference, and the second rotation speed is greater than the first rotation speed; and when the pressure difference is greater than the second difference value, the defrosting rotation speed is a third rotation speed, wherein the third rotation speed is greater than the second rotation speed. The corresponding relation between the pressure difference and the defrosting rotation speed is as follows:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Defrosting rotation speed R＝R1 R＝R2 R＝R3
Wherein, Δ P is a pressure difference, P1 and P2 are respectively a first difference and a second difference, R is a defrosting rotation speed, R1 is a first rotation speed, R2 is a second rotation speed, and R3 is a third rotation speed.
The defrosting rotation speed is divided into three gears of a first rotation speed, a second rotation speed and a third rotation speed, the three gears correspond to three pressure sections respectively, and the defrosting rotation speed is determined according to the pressure section where the pressure difference is located. The control logic is simple and stable and is easy to realize. But also can meet the trend that the higher the pressure difference is, the higher the defrosting rotating speed is.
Correspondingly, the specific value of the defrosting frequency can be divided according to the method. In an alternative embodiment, the defrost frequency and the pressure differential satisfy the following relationship:
when the pressure difference is smaller than the first difference value, the defrosting frequency is a first frequency; when the pressure is between the first difference and a second difference, the defrosting frequency is a second frequency, wherein the second difference is greater than the first difference, and the second frequency is greater than the first frequency; when the pressure difference is larger than the second difference, the defrosting frequency is a third frequency, wherein the third frequency is larger than the second frequency. The corresponding relationship between the pressure difference and the defrosting frequency is as follows:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Frequency of defrosting f＝f1 f＝f2 f＝f3
Wherein Δ P is a pressure difference, P1 and P2 are respectively a first difference and a second difference, f is a defrosting speed, f1 is a first speed, f2 is a second speed, and f3 is a third speed.
It should be understood that the above embodiment only exemplifies the case of dividing into three pressure sections, and in other optional embodiments, the pressure may be further divided more finely, and the defrosting frequency and the defrosting rotation speed corresponding to each pressure section are refined, so that the control is more refined, and the defrosting effect is better.
In other optional embodiments, the defrosting speed and the pressure difference can also satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Defrosting rotation speed R＝R0 R＝R0+aΔP R＝R0+bΔP
Wherein, Δ P is a pressure difference, P1 and P2 are respectively a first difference and a second difference, R is a defrosting rotation speed, R0 is a basic rotation speed, a and b are preset proportionality coefficients, wherein b is larger than a.
In the embodiment, three pressure sections are provided, the calculation mode of the defrosting rotation speed is determined by judging which pressure section the pressure difference is in, and the defrosting rotation speed corresponding to the pressure section with the higher pressure value is also ensured to be higher. When P1 is less than or equal to delta P is less than or equal to P2, R is R0+ a delta P, which means that in the interval [ P1, P2], the defrosting rotation speed R is still a variable and linearly increases along with the pressure difference delta P, so that the defrosting control is finer. When Δ P > P2, R ═ R0+ b Δ P, and the defrosting speed R is also a variable and increases linearly with the pressure difference Δ P, but the proportionality coefficient b is larger than the proportionality coefficient a corresponding to [ P1, P2], meaning that a higher defrosting speed should be used when the pressure difference Δ P is large and the frost formation is thick.
Similarly, in alternative embodiments, the defrost frequency and pressure differential may satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2
Frequency of defrosting f＝f0 f＝f0+cΔP f＝f0+dΔP
Wherein, Δ P is pressure difference, P1 and P2 are respectively a first difference and a second difference, f is defrosting frequency, f0 is basic frequency, c and d are preset proportionality coefficients, wherein d is larger than c.
The advantage of the defrosting frequency determining method is similar to that of the defrosting rotation speed determining method in the embodiment, so that the defrosting frequency can be more finely controlled, and the thick defrosting requirement can be better met.
Optionally, the basic rotation speed R0 can be set to 800-900R/min, and the basic frequency f0 can be set to 80-90 Hz. It should be understood that the preset proportionality coefficients a, b, c, d may be selected according to the specific air conditioner operation requirement and the unit of pressure, rotation speed, and frequency.
In this embodiment of the application, when determining the defrosting parameter of the air conditioner 010, one of the defrosting rotation speed of the outer fan 140 or the defrosting frequency of the compressor 120 may be selected to be determined, or both of them may be determined, so as to be called after subsequently entering the defrosting mode.
And step S400, controlling the air conditioner to enter a defrosting mode, wherein in the defrosting mode, the rotating speed of the outer fan is the defrosting rotating speed and/or the frequency of the compressor is the defrosting frequency.
When the defrosting parameter is determined, the controller 300 controls the air conditioner 010 to enter a defrosting mode and operate according to the defrosting parameter. In the embodiment of the present application, after entering the defrosting mode, the rotation speed of the outer fan 140 is the previously determined defrosting rotation speed and/or the frequency of the compressor 120 is the previously determined defrosting frequency.
Further, the defrosting control method may further include: in the defrosting mode, if the high-pressure side pressure of the compressor 120 is not changed for a preset time, the defrosting mode is exited.
During defrosting, the high-side pressure of the compressor 120 gradually rises back as the thickness of the frost layer becomes thinner. When the frost is completely formed, the high-side pressure of the compressor 120 is stabilized. Therefore, if the high-side pressure of the compressor 120 is kept unchanged for a preset time period, it can be considered that the frost layer is completely defrosted, and the defrosting mode can be exited. In an optional embodiment, the preset time period is 5-30 s, for example 10 s.
Fig. 4 is a schematic diagram of a defrosting control device 600 according to an embodiment of the present application. As shown in fig. 4, a defrosting control apparatus 600 provided in an embodiment of the present application includes:
the initial pressure acquiring module 610 is used for acquiring the initial pressure of the high-pressure side of the compressor after the air conditioner is started in a heating mode;
a defrosting pressure obtaining module 620, configured to obtain a defrosting pressure on a high pressure side of the compressor when the air conditioner satisfies a defrosting condition;
the parameter setting module 630 is configured to determine a defrosting rotation speed of the external fan and/or a defrosting frequency of the compressor according to a pressure difference between the defrosting pressure and the initial pressure;
and the defrosting module 640 is used for controlling the air conditioner to enter a defrosting mode, wherein in the defrosting mode, the rotating speed of the outer fan is a defrosting rotating speed and/or the frequency of the compressor is a defrosting frequency.
It should be understood that the above modules and units may be executable computer programs for implementing corresponding functions, which can be stored in the storage medium 500 and called and executed by the controller 300 to implement the corresponding functions. For a specific implementation manner of the functions of the modules, reference may be made to the description of the defrosting control method in the foregoing embodiment of the present application, and details are not described here again.
Fig. 5 is a block diagram of an air conditioner 010 according to an embodiment of the present invention. As shown in fig. 5, the air conditioner 010 of the embodiment of the present application further includes a storage medium 500 and a bus 400, and the controller 300 is connected to the storage medium 500 through the bus 400. The controller 300 is used for executing an executable program to implement the defrosting control method provided by the embodiment of the application.
The controller 300 may be an integrated circuit chip having signal processing capabilities. The controller 300 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps, and flowchart disclosed in the embodiments of the present invention may be implemented or performed.
The storage medium 500 is used to store a program, such as the defrosting control apparatus 600 shown in fig. 4. The defrosting control device 600 includes at least one software function module which can be stored in the storage medium 500 in the form of software or firmware (firmware) or is solidified in an operating system of the air conditioner, and the controller 300 executes the above program to implement the air conditioner control method disclosed in the above embodiment after receiving the execution instruction. The storage medium 500 may be in the form of a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or any other medium capable of storing program codes. In alternative embodiments, the storage medium 500 may be integrated with the controller 300, for example, the storage medium 500 may be integrated with the controller 300 in a chip.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (12)

1. A defrosting control method is applied to an air conditioner and is characterized by comprising the following steps:
after the air conditioner is heated and started, acquiring the initial pressure of the high-pressure side of the compressor;
acquiring defrosting pressure of a high-pressure side of the compressor when the air conditioner meets defrosting conditions;
determining the defrosting rotation speed of an outer fan and/or the defrosting frequency of the compressor according to the pressure difference between the defrosting pressure and the initial pressure;
and controlling the air conditioner to enter a defrosting mode, wherein in the defrosting mode, the rotating speed of the outer fan is the defrosting rotating speed and/or the frequency of the compressor is the defrosting frequency.
2. The defrosting control method according to claim 1 wherein the defrosting rotation speed is positively correlated with the pressure difference.
3. The defrosting control method according to claim 2, wherein the defrosting rotation speed and the pressure difference satisfy the following relationship:
when the pressure difference is smaller than a first difference value, the defrosting rotation speed is a first rotation speed;
when the pressure is between a first difference value and a second difference value, the defrosting rotation speed is a second rotation speed, wherein the second difference value is larger than the first difference value, and the second rotation speed is larger than the first rotation speed;
and when the pressure difference is greater than the second difference value, the defrosting rotation speed is a third rotation speed, wherein the third rotation speed is greater than the second rotation speed.
4. The defrosting control method according to claim 2, wherein the defrosting rotation speed and the pressure difference satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2 Defrosting rotation speed R＝R0 R＝R0+aΔP R＝R0+bΔP
Wherein, Δ P is the pressure difference, P1 and P2 are respectively a first difference and a second difference, R is the defrosting speed, R0 is the basic speed, a and b are preset proportionality coefficients, wherein b is larger than a.
5. The defrosting control method according to claim 1 wherein the defrosting frequency is positively correlated with the pressure difference.
6. The defrosting control method according to claim 5 wherein the defrosting frequency and the pressure difference satisfy the following relationship:
when the pressure difference is less than a first difference value, the defrosting frequency is a first frequency;
when the pressure is between a first difference and a second difference, the defrosting frequency is a second frequency, wherein the second difference is greater than the first difference, and the second frequency is greater than the first frequency;
when the pressure difference is greater than the second difference, the defrosting frequency is a third frequency, wherein the third frequency is greater than the second frequency.
7. The defrosting control method according to claim 5 wherein the defrosting frequency and the pressure difference satisfy the following relationship:
pressure difference ΔP＜P1 P1≤ΔP≤P2 ΔP＞P2 Frequency of defrosting f＝f0 f＝f0+cΔP f＝f0+dΔP
Wherein, Δ P is the pressure difference, P1 and P2 are respectively a first difference and a second difference, f is the defrosting frequency, f0 is the basic frequency, c and d are preset proportionality coefficients, wherein d is larger than c.
8. The defrosting control method according to claim 1, further comprising:
and in the defrosting mode, if the pressure of the high-pressure side of the compressor is kept unchanged for a preset time, the defrosting mode is exited.
9. The defrosting control method according to claim 8 wherein the preset time period is 5 to 30 seconds.
10. The defrosting control method according to claim 1, wherein the initial pressure of the high-pressure side of the compressor is 0.5-3 min after the air conditioner is started for heating.
11. A defrosting control device applied to an air conditioner is characterized by comprising:
the initial pressure acquisition module is used for acquiring the initial pressure of the high-pressure side of the compressor after the air conditioner is started in a heating mode;
the defrosting pressure acquisition module is used for acquiring the defrosting pressure of the high-pressure side of the compressor when the air conditioner meets the defrosting condition;
the parameter setting module is used for determining the defrosting rotation speed of the outer fan and/or the defrosting frequency of the compressor according to the pressure difference between the defrosting pressure and the initial pressure;
and the defrosting module is used for controlling the air conditioner to enter a defrosting mode, and under the defrosting mode, the rotating speed of the outer fan is the defrosting rotating speed and/or the frequency of the compressor is the defrosting frequency.
12. An air conditioner comprising a controller for executing an executable program to implement the defrosting control method according to any one of claims 1 to 10.
CN202110538867.2A 2021-05-18 2021-05-18 Defrosting control method and device and air conditioner Active CN113154637B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110538867.2A CN113154637B (en) 2021-05-18 2021-05-18 Defrosting control method and device and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110538867.2A CN113154637B (en) 2021-05-18 2021-05-18 Defrosting control method and device and air conditioner

Publications (2)

Publication Number Publication Date
CN113154637A true CN113154637A (en) 2021-07-23
CN113154637B CN113154637B (en) 2022-04-19

Family

ID=76876240

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110538867.2A Active CN113154637B (en) 2021-05-18 2021-05-18 Defrosting control method and device and air conditioner

Country Status (1)

Country Link
CN (1) CN113154637B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113531848A (en) * 2021-07-29 2021-10-22 珠海格力电器股份有限公司 Air conditioner mode adjusting method, control device, air conditioner and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018095182A (en) * 2016-12-16 2018-06-21 株式会社デンソー Refrigeration cycle device
KR20190040671A (en) * 2017-10-11 2019-04-19 엘지전자 주식회사 Air conditioner and control method thereof
CN111023461A (en) * 2019-12-31 2020-04-17 宁波奥克斯电气股份有限公司 Detection control method and system of air conditioner, air conditioner and storage medium
CN111720953A (en) * 2020-06-05 2020-09-29 海信（山东）空调有限公司 Air conditioner and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018095182A (en) * 2016-12-16 2018-06-21 株式会社デンソー Refrigeration cycle device
KR20190040671A (en) * 2017-10-11 2019-04-19 엘지전자 주식회사 Air conditioner and control method thereof
CN111023461A (en) * 2019-12-31 2020-04-17 宁波奥克斯电气股份有限公司 Detection control method and system of air conditioner, air conditioner and storage medium
CN111720953A (en) * 2020-06-05 2020-09-29 海信（山东）空调有限公司 Air conditioner and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113531848A (en) * 2021-07-29 2021-10-22 珠海格力电器股份有限公司 Air conditioner mode adjusting method, control device, air conditioner and storage medium

Also Published As

Publication number Publication date
CN113154637B (en) 2022-04-19

Similar Documents

Publication Publication Date Title
CN109357374B (en) Heating control method and device and multi-split air conditioning system
CN111380147B (en) Variable frequency air conditioner overload control method and device and variable frequency air conditioner
CN109489199B (en) Control method, device and system of air conditioning system and storage medium
CN111780333A (en) Control method and device of air conditioner and air conditioner equipment
CN112628984B (en) Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner
EP3450865A1 (en) Air conditioner
CN109539380B (en) Method for controlling frequency of compressor of heat pump water heater
EP3859244A1 (en) Air-conditioner
CN113154637B (en) Defrosting control method and device and air conditioner
CN108534322B (en) Starting control method of air conditioner
CN108548269B (en) Control method of air conditioner
CN111536653B (en) Noise control method and device, multi-split air conditioning system and storage medium
CN111121249B (en) Control method and control device of multi-split system and multi-split system
CN113124488B (en) Refrigeration control method and device and multi-split air conditioner
CN108548301B (en) Starting control method of air conditioner
CN112161372B (en) Air conditioner control method and device capable of effectively reducing noise and air conditioning unit
CN108361934B (en) Starting control method of air conditioner
CN113390205B (en) Oil return control method of household appliance, household appliance and computer readable storage medium
CN113503631B (en) Variable frequency compressor, frequency boosting control method and system thereof and air conditioner
CN113007861B (en) Method and module for determining air suction side pressure, and control method, device and system
CN115247858A (en) Air conditioner, control method thereof, and computer-readable storage medium
CN110542174B (en) Defrosting method of air conditioner external unit, computer readable storage medium and air conditioner
JP7195461B2 (en) air conditioner
EP3764022B1 (en) Hot water supply device
CN112000023A (en) Method and device for controlling equipment linkage

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant