CN115628518A - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

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Publication number
CN115628518A
CN115628518A CN202211180498.5A CN202211180498A CN115628518A CN 115628518 A CN115628518 A CN 115628518A CN 202211180498 A CN202211180498 A CN 202211180498A CN 115628518 A CN115628518 A CN 115628518A
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CN
China
Prior art keywords
preset
pressure
compressor
expansion valve
electronic expansion
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Pending
Application number
CN202211180498.5A
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Chinese (zh)
Inventor
徐春峰
蒋贤国
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Hisense Air Conditioning Co Ltd
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Hisense Air Conditioning Co Ltd
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Publication date
Application filed by Hisense Air Conditioning Co Ltd filed Critical Hisense Air Conditioning Co Ltd
Priority to CN202211180498.5A priority Critical patent/CN115628518A/en
Publication of CN115628518A publication Critical patent/CN115628518A/en
Pending legal-status Critical Current

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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
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • 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
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: a refrigeration system including a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value; the controller is used for controlling the running frequency of the compressor to reduce a preset frequency value when detecting that a preset high-pressure condition is met under the condition that the starting time of the compressor is shorter than a first preset time; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration. The embodiment of the invention can effectively avoid system halt caused by pressure overshoot, thereby improving the high-temperature operation capacity of the air conditioner.

Description

Air conditioner and control method thereof
Technical Field
The invention relates to the technical field of household appliances, in particular to an air conditioner and a control method of the air conditioner.
Background
Currently, a pressure switch is provided in a refrigeration system of a part of air conditioners. When the pressure of the refrigerant in the system rises to the set pressure, the pressure switch can be actively opened, so that the system cannot work normally; when the pressure of the refrigerant in the system is lower than the preset pressure value, the pressure switch can be automatically connected, so that the system can be restored to normal work. The inventor finds that in the process of implementing the invention, in a high-temperature working condition, the outdoor unit of the air conditioner has large load, is influenced by outdoor environment change fluctuation and voltage fluctuation, and the machine type with the pressure switch has high-pressure overshoot to cause system shutdown, so that the air conditioner cannot operate at high ambient temperature.
Disclosure of Invention
The embodiment of the invention provides an air conditioner and a control method of the air conditioner, which can effectively avoid system halt caused by pressure overshoot, thereby improving the high-temperature operation capacity of the air conditioner.
An embodiment of the present invention provides an air conditioner, including:
a refrigeration system including a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value;
the controller is used for controlling the running frequency of the compressor to reduce a preset frequency value when detecting that a preset high-pressure condition is met under the condition that the starting time of the compressor is shorter than a first preset time; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
Compared with the prior art, the air conditioner provided by the embodiment continuously detects whether the preset high-pressure condition is met or not through the condition that the starting time of the compressor is shorter than the first preset time, namely the initial starting stage of the compressor, and controls the operation frequency of the compressor to reduce the preset frequency value when the action time of switching the pressure switch to the first state is detected to meet the second preset time, so that the refrigerant pressure can be reduced through reducing the compressor frequency, the system shutdown caused by pressure overshoot is effectively avoided, and the high-temperature operation capacity of the air conditioner is improved.
As an improvement of the above solution, the air conditioner further comprises a temperature detection device for detecting the outdoor ambient temperature;
the controller is further configured to:
when the compressor is started, acquiring the current outdoor environment temperature;
determining a target frequency of the compressor according to the current outdoor environment temperature;
controlling the compressor to run up to the target frequency;
the controller is used for increasing the high-pressure times by one while controlling the running frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
the controller is further configured to control the compressor to suspend the up-conversion operation until the preset high-pressure condition is not met when the high-pressure times are greater than one.
In the embodiment, when the compressor is started, the frequency-up operation of the compressor is controlled according to the outdoor environment temperature, the matching of the refrigerating capacity and the environment temperature can be ensured, so that the high-temperature operation capacity of the air conditioner is improved, and if the preset high-pressure condition is continuously detected to be met, the frequency-up action of the compressor is forbidden while the frequency of the compressor is reduced, so that the pressure overshoot is further avoided.
As an improvement of the above scheme, the controller is further configured to increase the number of times of high pressure by one while controlling the operating frequency of the compressor to decrease a preset frequency value; wherein the initial value of the high voltage times is zero;
wherein the refrigeration system further comprises an electronic expansion valve for controlling the flow of refrigerant;
the controller is further configured to:
when the starting time of the compressor is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times;
and if the high-pressure times are greater than the preset times, controlling the opening of the electronic expansion valve to increase by a first preset step number, controlling the electronic expansion valve according to a preset valve control strategy, and resetting the high-pressure times.
In this embodiment, when the startup duration of the air conditioner is equal to or greater than the first preset duration, that is, in the normal operation stage of the compressor, if the number of times that the preset high-pressure condition is not satisfied is too many, the opening of the electronic expansion valve is further increased and the system throttling is reduced under the condition that the frequencies are consistent, so that the protection time of the pressure switch is used as a control parameter, the frequency of the compressor and the opening of the electronic expansion valve are coupled for control, the system pressure is more accurately adjusted, and the pressure overshoot is further avoided.
As an improvement to the above, the valve control strategy comprises:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve;
and controlling the electronic expansion valve according to the difference value between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve.
In this embodiment, the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve can well reflect whether the refrigeration system meets the refrigeration requirement, so that the electronic expansion valve is controlled according to the difference, the capacity of the refrigeration system can be ensured, and pressure overshoot is avoided.
Further, the controlling the opening degree of the electronic expansion valve according to the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve includes:
when the difference is larger than a first preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a first speed;
when the difference is larger than a second preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a second speed; wherein the second preset difference is smaller than the first preset difference, and the second speed is smaller than the first speed;
when the difference value is between a second preset difference value and a third preset difference value and the duration time reaches a third preset time length, controlling the electronic expansion valve to close at a third speed; and the third preset difference is smaller than the second preset difference, and the third speed is smaller than the second speed.
In this embodiment, when the difference is larger, the closing speed is controlled to be faster, so that the time consumed for reaching the target discharge temperature can be shortened, thereby improving the capacity of the refrigeration system, and when the difference is smaller, the temperature is close to the target temperature, so as to avoid overshoot of the system pressure, the speed is reduced, and the overshoot of the system pressure caused by too fast closing is avoided.
As an improvement of the above, the controller is further configured to:
and when the starting time of the compressor is equal to or longer than the first preset time, controlling the opening degree of the electronic expansion valve to increase by a second preset step number when the preset high-pressure condition is detected to be met.
In this embodiment, if the preset high pressure condition is satisfied, the opening of the electronic expansion valve is increased, so as to reduce the system throttling, reduce the system pressure, and avoid the pressure overshoot.
As an improvement of the above solution, the controller is further configured to increase the high pressure number by one while controlling the opening degree of the electronic expansion valve to increase by a second preset number of steps;
and the controller is also used for suspending the control of the electronic expansion valve according to a preset valve control strategy when the high-pressure times are more than one until the preset high-pressure condition is not met.
In this embodiment, if the preset high-pressure condition is satisfied many times in the normal operation stage of the compressor, the control of the electronic expansion valve according to the preset valve control strategy is suspended, so that the increase of system throttling caused by valve closing is avoided, and the system pressure is prevented from being increased.
Correspondingly, another embodiment of the invention provides a control method of an air conditioner, wherein a refrigeration system of the air conditioner comprises a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value; the method comprises the following steps:
under the condition that the starting time of the compressor is shorter than a first preset time, controlling the running frequency of the compressor to reduce a preset frequency value when detecting that a preset high-pressure condition is met; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
Compared with the prior art, according to the control method of the air conditioner provided by the embodiment, whether the preset high-pressure condition is met or not is continuously detected under the condition that the starting time of the compressor is shorter than the first preset time, namely the initial starting stage of the compressor, and the operation frequency of the compressor is controlled to reduce the preset frequency value when the action time of switching the pressure switch to the first state is detected to meet the second preset time, so that the refrigerant pressure can be reduced by reducing the frequency of the compressor, the system shutdown caused by pressure overshoot is effectively avoided, and the high-temperature operation capacity of the air conditioner is improved.
As an improvement of the above, the method further comprises:
increasing the high-pressure times by one while controlling the operating frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
wherein the refrigeration system further comprises an electronic expansion valve for controlling the flow of refrigerant;
the method further comprises the following steps:
when the compressor is started, acquiring the current outdoor environment temperature;
determining the target opening degree of the electronic expansion valve according to the current outdoor environment temperature;
controlling the electronic expansion valve to adjust to the target opening degree;
when the starting time of the compressor is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times;
and if the high-pressure times are greater than the preset times, controlling the opening of the electronic expansion valve to increase a first preset step number, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times.
In this embodiment, when the startup duration of the air conditioner is equal to or greater than the first preset duration, that is, in the normal operation stage of the compressor, if the number of times that the preset high-pressure condition is not satisfied is too many, the opening of the electronic expansion valve is further increased and the system throttling is reduced under the condition that the frequencies are consistent, so that the protection time of the pressure switch is used as a control parameter, the frequency of the compressor and the opening of the electronic expansion valve are coupled for control, the system pressure is more accurately adjusted, and the pressure overshoot is further avoided.
As an improvement to the above, the valve control strategy comprises:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve;
and controlling the electronic expansion valve according to the difference value between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve.
In this embodiment, the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve can well reflect whether the refrigeration system meets the refrigeration requirement, so that the electronic expansion valve is controlled according to the difference, the capacity of the refrigeration system can be ensured, and pressure overshoot is avoided.
Drawings
Fig. 1 is a schematic view of an overall structure of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view illustrating an indoor unit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a signal connection diagram of an air conditioner according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a specific working process of an air conditioner according to an embodiment of the present invention;
fig. 6 is a signal connection diagram of an air conditioner according to another embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a specific operation flow of an air conditioner according to another embodiment of the present invention;
fig. 8 is a signal connection diagram of an air conditioner according to another embodiment of the present invention;
fig. 9 is a schematic view illustrating a specific operation flow of an air conditioner according to another embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a specific operation flow of an air conditioner according to another embodiment of the present invention;
fig. 11 is a schematic diagram illustrating a specific operation flow of an air conditioner according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
The air conditioner 1 provided by the embodiment of the invention comprises an outdoor unit 2 and an indoor unit 3. The outdoor unit 2 of the air conditioner 1 refers to a portion of a refrigeration cycle including the compressor 11 and an outdoor heat exchanger, the indoor unit 3 of the air conditioner 1 includes an indoor heat exchanger, and the electronic expansion valve 14 may be provided in the indoor unit 3 or the outdoor unit 2.
The outdoor unit 2 is generally installed outdoors and used for heat exchange in an indoor environment. In the illustration of fig. 1, the outdoor unit 2 is indicated by a broken line because the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 with respect to the wall surface WL.
Fig. 2 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigeration system 10, and is capable of executing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigeration system 10. The indoor unit 3 and the outdoor unit 2 are connected by an on-line pipe 4 to form a refrigeration system 10 for circulating a refrigerant. The refrigeration system 10 includes a compressor 11, an outdoor heat exchanger 13, an electronic expansion valve 14, an accumulator 15, an indoor heat exchanger 16, and a pressure switch 12 (not shown).
Among them, the indoor heat exchanger 16 and the outdoor heat exchanger 13 operate as a condenser or an evaporator. The compressor 11 sucks the refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The outdoor heat exchanger 13 has a first inlet and a second outlet for allowing the refrigerant to flow between the refrigerant and the suction port of the compressor 11 through the accumulator 15, and the refrigerant flows between the electronic expansion valve 14 and the second inlet and the second outlet. The outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer pipe (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 13.
The electronic expansion valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The electronic expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The electronic expansion valve 14 is configured to be capable of changing the opening degree, and the opening degree is decreased to increase the flow path resistance of the refrigerant passing through the electronic expansion valve 14, and the opening degree is increased to decrease the flow path resistance of the refrigerant passing through the electronic expansion valve 14. Further, even if the states of other devices installed in the refrigeration system 10 do not change, when the opening degree of the electronic expansion valve 14 changes, the flow rate of the refrigerant flowing in the refrigeration system 10 changes. The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the electronic expansion valve 14 and the indoor heat exchanger, and has a first inlet and outlet for allowing the gas refrigerant to flow between the compressor 11 and the discharge port. The indoor heat exchanger 16 exchanges heat between the refrigerant flowing through the heat transfer tubes connected between the second inlet and the first inlet of the indoor heat exchanger 16 and the indoor air. An accumulator 15 is disposed between the outdoor heat exchanger 13 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. The gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of outdoor air passing through the outdoor heat exchanger 13 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the outdoor air. The outdoor fan 21 is driven by an outdoor fan motor 21a whose rotation speed can be changed. Referring to fig. 2 and 3, the indoor unit 3 includes a fan 31, and the fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16 to promote heat exchange between the refrigerant flowing through the heat transfer pipes and the indoor air. The fan 31 is driven by an indoor fan motor 31a whose rotational speed can be changed. As shown in fig. 3, the indoor unit 3 includes, in addition to the indoor heat exchanger 16 and the fan 31, a casing 61, an air filter, and an air guide mechanism including an air guide plate 64 for adjusting the vertical air outlet direction of the indoor unit 3 and a flap assembly 63 for adjusting the lateral air outlet direction of the indoor unit 3. The air conditioner 1 further includes a remote controller 5. The remote controller 5 has a liquid crystal display device 5a and buttons 5b shown in fig. 1. The user can operate these switches using the operation switch, the temperature setting switch, the wind direction setting switch, the air volume setting switch, the heat stress comfort function, and the corresponding buttons 5b.
The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged. The compressor 11 compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The electronic expansion valve 14 expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve 14 and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 11. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner 1 can adjust the temperature of the indoor space throughout the cycle.
The pressure switch 12 may be disposed on a suction and exhaust pipeline of the compressor 11, the pressure switch 12 has a first state and a second state, the pressure switch 12 is specifically configured to detect a pressure value in the refrigeration system, switch to the first state when the pressure value is detected to be greater than a preset pressure threshold, and switch to the second state when the pressure value is detected to be less than or equal to the preset pressure threshold.
Referring to fig. 4, the air conditioner 1 according to the embodiment of the present invention further includes a controller 20; the controller 20 is connected to the compressor 11 to control the operation of the compressor 11; the compressor 11 is also connected to the pressure switch 12 to obtain the state of the pressure switch 12. The controller 20 is configured to control the operating frequency of the compressor 11 to decrease a preset frequency value when detecting that a preset high-pressure condition is met when the startup duration of the compressor 11 is less than a first preset duration; the preset high-pressure condition is that the pressure switch 12 is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
Specifically, referring to fig. 5, the operation flow of the air conditioner 1 is as follows: starting the compressor 11 (step S10); the controller 20 determines a relationship between a startup time period of the compressor 11 and a time period less than a first preset time period (step S11); the controller 20 detects whether a preset high-pressure condition is met in real time when the starting-up time of the compressor 11 is shorter than a first preset time (step S12), wherein the preset high-pressure condition is that the pressure switch 12 is switched from the second state to the first state and the holding time in the first state reaches a second preset time; whenever it is detected that the preset high pressure condition is satisfied, it indicates that the current condensing pressure of the refrigeration system is too large, and at this time, the operation frequency of the compressor 11 is controlled to decrease the preset frequency value (step S13), so as to decrease the current condensing pressure.
It should be noted that the first preset time period, the second preset time period, and the preset frequency value may be set according to actual requirements, and are not limited herein. Optionally, the first preset time period is 5min, the second preset time period is 5s, and the preset frequency value is 3hz.
Compared with the prior art, in the air conditioner 1 provided in this embodiment, under the condition that the startup duration of the compressor 11 is less than the first preset duration, that is, at the initial start-up stage of the compressor 11, whether the preset high-pressure condition is met or not is continuously detected, and whenever it is detected that the action time of the pressure switch 12 switching to the first state meets the second preset duration, the operation frequency of the compressor 11 is controlled to reduce the preset frequency value, so that the refrigerant pressure can be reduced by reducing the frequency of the compressor 11, system shutdown caused by pressure overshoot is effectively avoided, and the high-temperature operation capability of the air conditioner 1 is improved.
As one of alternative embodiments, referring to fig. 6, the air conditioner 1 further includes a temperature detection device 30 for detecting an outdoor ambient temperature; the controller 20 is connected to the temperature detecting device 30 to obtain the detected outdoor ambient temperature.
The controller 20 is further configured to:
when the compressor 11 is started, acquiring the current outdoor environment temperature;
determining a target frequency of the compressor 11 according to the current outdoor environment temperature;
controlling the compressor 11 to run up to the target frequency;
wherein the controller 20, while controlling the operating frequency of the compressor 11 to decrease by the preset frequency value, is further configured to: adding one to the high pressure times; wherein the initial value of the high voltage times is zero;
the controller 20 is further configured to:
and when the high-pressure times are more than one, controlling the compressor 11 to pause the frequency increasing operation until the preset high-pressure condition is not met.
Specifically, referring to fig. 7, the operation flow of the air conditioner 1 is as follows: starting the compressor 11; the controller 20 obtains the current outdoor ambient temperature when the compressor 11 is turned on (step S22); the controller 20 determines a target frequency of the compressor 11 according to the current outdoor ambient temperature (step S23); the controller 20 controls the compressor 11 to perform up-conversion operation to the target frequency (step S24), and the controller 20 determines a relationship between a starting time length of the compressor 11 and a time length less than a first preset time length (step S11); the controller 20 detects whether a preset high-pressure condition is met in real time when the starting-up time of the compressor 11 is shorter than a first preset time (step S12), wherein the preset high-pressure condition is that the pressure switch 12 is switched from the second state to the first state and the holding time in the first state reaches a second preset time; when detecting that the preset high pressure condition is met, it indicates that the current condensing pressure of the refrigeration system is too large, and at this time, the operation frequency of the compressor 11 is controlled to decrease the preset frequency value (step S13), so as to decrease the current condensing pressure, and increase the high pressure times by one; the controller 20 controls the compressor 11 to suspend the up-conversion operation when the number of times of the high pressure is greater than one, until the preset high pressure condition is not satisfied (step S14).
In this embodiment, when the compressor 11 is started, the compressor 11 is controlled to perform the up-conversion operation according to the outdoor ambient temperature, so as to ensure that the cooling capacity matches the ambient temperature, thereby improving the high-temperature operation capacity of the air conditioner 1, and if it is continuously detected that the preset high-pressure condition is met, the up-conversion operation of the compressor 11 is prohibited while the frequency of the compressor 11 is reduced, thereby further avoiding the pressure overshoot.
As an alternative embodiment, the controller 20 is configured to increase the number of times of high pressure by one while controlling the operating frequency of the compressor 11 to decrease by a preset frequency value; wherein the initial value of the high voltage number is zero.
Wherein, referring to fig. 8, the refrigeration system further comprises an electronic expansion valve 14 for controlling the flow of refrigerant; the controller 20 is connected to the electronic expansion valve 14 to adjust the opening degree of the electronic expansion valve 14.
Referring to fig. 9, the controller 20 is further configured to:
s31, when the starting-up time of the compressor 11 is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
s32, if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve 14 according to a preset valve control strategy, and clearing the high-pressure times;
and S33, if the high-pressure times are greater than the preset times, controlling the opening degree of the electronic expansion valve 14 to increase by a first preset step number, controlling the electronic expansion valve 14 according to a preset valve control strategy, and clearing the high-pressure times.
In this embodiment, when the startup duration of the air conditioner 1 is equal to or greater than the first preset duration, that is, in the normal operation stage of the compressor 11, if the number of times that the preset high-pressure condition is not satisfied is too many, the opening degree of the electronic expansion valve 14 is further increased and the system throttling is reduced under the condition that the frequencies are consistent, so that the protection time of the pressure switch 12 is used as a control parameter to couple the frequency of the compressor 11 and the opening degree of the electronic expansion valve 14 for control, thereby more accurately adjusting the system pressure and further avoiding the pressure overshoot. Wherein, the first predetermined number of steps may be 50 steps.
Further, the controller 20 is further configured to:
when the compressor 11 is started, acquiring the current outdoor environment temperature;
determining a target opening degree of the electronic expansion valve 14 according to the current outdoor environment temperature;
and controlling the electronic expansion valve 14 to adjust to the target opening degree.
Therefore, when the compressor 11 is started, the initial opening degree of the electronic expansion valve 14 is controlled according to the outdoor ambient temperature, so that the matching between the refrigeration capacity and the ambient temperature can be ensured, and the high-temperature operation capacity of the air conditioner 1 can be improved.
Further, the valve control strategy includes:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve 14;
the electronic expansion valve 14 is controlled based on a difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve 14.
In this embodiment, the target exhaust temperature may be calculated according to the preset temperature of the air conditioner 1, and the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve 14 can well reflect whether the refrigeration system meets the refrigeration requirement, so that the electronic expansion valve 14 is controlled according to the difference, the capacity of the refrigeration system can be ensured, and meanwhile, pressure overshoot is avoided.
Further, the controlling the opening degree of the electronic expansion valve 14 according to the difference between the target exhaust gas temperature and the current exhaust gas temperature of the electronic expansion valve 14 includes:
when the difference is greater than the first preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve 14 to close at a first speed;
when the difference is greater than a second preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve 14 to close at a second speed; wherein the second preset difference is smaller than the first preset difference, and the second speed is smaller than the first speed;
when the difference is between the second preset difference and a third preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve 14 to close at a third speed; and the third preset difference is smaller than the second preset difference, and the third speed is smaller than the second speed.
It should be noted that the first preset difference, the second preset difference, the third preset difference, the first speed, the second speed, and the third speed may all be set according to actual requirements, and are not limited herein.
Optionally, the first preset difference is 5, the second preset difference is 3, the third preset difference is-3, the first speed is 2 steps/5 s, the second speed is 2 steps/20 s, and the third speed is 2 steps/60 s. Specifically, assuming that the target exhaust gas temperature is Pd0 and the current exhaust gas temperature is Pd, if Pd0-Pd > 5 and hold for 5s, the electronic expansion valve 14 is closed in 2 steps/5 s, if Pd0-Pd > 3 and hold for 5s, the electronic expansion valve 14 is closed in 2 steps/20 s, and if 3 > PdO-Pd > -3 and hold for 5s, the electronic expansion valve 14 is closed and opened in 2 steps/60 s.
In this embodiment, when the difference is larger, the closing speed is controlled to be faster, so that the time consumed for reaching the target discharge temperature can be shortened, thereby improving the capacity of the refrigeration system, and when the difference is smaller, the temperature is close to the target temperature, so as to avoid overshoot of the system pressure, the speed is reduced, and the overshoot of the system pressure caused by too fast closing is avoided.
Further, referring to fig. 10, the controller 20 is further configured to:
and S41, when the starting-up time of the compressor 11 is equal to or longer than the first preset time, controlling the opening degree of the electronic expansion valve 14 to increase by a second preset step number when the preset high-pressure condition is met.
In this embodiment, if the preset high-pressure condition is satisfied, the opening degree of the electronic expansion valve 14 is increased, so as to reduce the system throttling, reduce the system pressure, and avoid the pressure overshoot.
Still further, referring to fig. 11, the controller 20 is configured to increase the high pressure number by one while controlling the opening degree of the electronic expansion valve 14 to increase by a second preset number of steps;
the controller 20 is further configured to:
and S42, when the high-pressure times are more than one, suspending the control of the electronic expansion valve 14 according to a preset valve control strategy until the preset high-pressure condition is not met.
In this embodiment, if the preset high pressure condition is satisfied for multiple times in the normal operation stage of the compressor 11, the control of the electronic expansion valve 14 according to the preset valve control strategy is suspended, so as to avoid the increase of system throttling caused by valve closing, which results in the increase of system pressure.
In the prior art, a pressure switch 12 of 4.15Mpa is selected according to the characteristics of the R410A refrigerant, and a pressure margin is left, and the highest environment is 57 ℃. With the expansion of the demand of the Saudi market, the air conditioner 1 which can only operate at 57 ℃ still has refrigeration demand even under the environment of 61-63 ℃, so that the use demand of users is not met any more, the pressure needs to be further increased, and the pressure space is fully utilized. The air conditioner 1 provided by the embodiment of the invention distinguishes the starting stage and the operating stage, adopts the frequency and pressure switch 12 to keep time control in the starting stage, adopts the electronic expansion valve 14 and the pressure switch 12 to keep time control in the operating stage, can maximally utilize the pressure space in the operating process, solves the problem of narrow pressure range caused by pressure and environmental fluctuation, improves the high-temperature adaptability, and can improve the highest operating temperature from 57 ℃ to 63 ℃.
Correspondingly, another embodiment of the invention provides a control method of an air conditioner, wherein a refrigeration system of the air conditioner comprises a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value; the method comprises the following steps:
under the condition that the starting time of the compressor is shorter than a first preset time, controlling the running frequency of the compressor to reduce a preset frequency value when detecting that a preset high-pressure condition is met; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
Compared with the prior art, according to the control method of the air conditioner provided by the embodiment, whether the preset high-pressure condition is met or not is continuously detected under the condition that the starting time of the compressor is shorter than the first preset time, namely the initial starting stage of the compressor, and the operating frequency of the compressor is controlled to be reduced by the preset frequency value when the action time of switching the pressure switch to the first state is detected to meet the second preset time, so that the pressure of a refrigerant can be reduced by reducing the frequency of the compressor, the system halt caused by pressure overshoot is effectively avoided, and the high-temperature operating capacity of the air conditioner is improved.
As an improvement of the above, the method further comprises:
increasing the high-pressure times by one while controlling the operating frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
wherein the refrigeration system further comprises an electronic expansion valve for controlling the flow of refrigerant;
the method further comprises the following steps:
when the compressor is started, acquiring the current outdoor environment temperature;
determining the target opening degree of the electronic expansion valve according to the current outdoor environment temperature;
controlling the electronic expansion valve to adjust to the target opening degree;
when the starting time of the compressor is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times;
and if the high-pressure times are greater than the preset times, controlling the opening of the electronic expansion valve to increase by a first preset step number, controlling the electronic expansion valve according to a preset valve control strategy, and resetting the high-pressure times.
In this embodiment, when the starting time of the air conditioner is equal to or longer than the first preset time, that is, in the normal operation stage of the compressor, if the number of times that the preset high-pressure condition is not satisfied is too many, the opening of the electronic expansion valve is further increased and the system throttling is reduced under the condition that the frequencies are consistent, so that the protection time of the pressure switch is used as a control parameter, the frequency of the compressor and the opening of the electronic expansion valve are coupled for control, the system pressure is more accurately adjusted, and the pressure overshoot is further avoided.
Further, the valve control strategy includes:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve;
and controlling the electronic expansion valve according to the difference value between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve.
In this embodiment, the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve can well reflect whether the refrigeration system meets the refrigeration requirement, so that the electronic expansion valve is controlled according to the difference, the capacity of the refrigeration system can be ensured, and pressure overshoot is avoided.
Further, the controlling the opening degree of the electronic expansion valve according to the difference between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve includes:
when the difference is larger than a first preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a first speed;
when the difference is larger than a second preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a second speed; wherein the second preset difference is smaller than the first preset difference, and the second speed is smaller than the first speed;
when the difference value is between a second preset difference value and a third preset difference value and the duration time reaches a third preset duration time, controlling the electronic expansion valve to close at a third speed; and the third preset difference is smaller than the second preset difference, and the third speed is smaller than the second speed.
In this embodiment, when the difference is larger, the closing speed is controlled to be faster, so that the time consumed for reaching the target discharge temperature can be shortened, thereby improving the capacity of the refrigeration system, and when the difference is smaller, the temperature is close to the target temperature, so as to avoid overshoot of the system pressure, the speed is reduced, and the overshoot of the system pressure caused by too fast closing is avoided.
Further, the method further comprises:
and when the starting time of the compressor is equal to or longer than the first preset time, controlling the opening degree of the electronic expansion valve to increase by a second preset step number when the preset high-pressure condition is detected to be met.
In this embodiment, if the preset high pressure condition is satisfied, the opening of the electronic expansion valve is increased, so as to reduce the system throttling, reduce the system pressure, and avoid the pressure overshoot.
Still further, the method further comprises:
increasing the high-pressure times by one while controlling the opening degree of the electronic expansion valve to increase by a second preset step number;
and when the high-pressure times are more than one, suspending control over the electronic expansion valve according to a preset valve control strategy until the preset high-pressure condition is not met.
In this embodiment, if the preset high-pressure condition is satisfied many times in the normal operation stage of the compressor, the control of the electronic expansion valve according to the preset valve control strategy is suspended, so that the increase of system throttling caused by valve closing is avoided, and the system pressure is prevented from being increased.
As one of the optional embodiments, the air conditioner further comprises a temperature detection device for detecting the outdoor ambient temperature;
the method further comprises the following steps:
when the compressor is started, acquiring the current outdoor environment temperature;
determining a target frequency of the compressor according to the current outdoor environment temperature;
controlling the compressor to run up to the target frequency;
increasing the high pressure times by one while controlling the running frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
and when the high-pressure times are more than one, controlling the compressor to suspend the frequency-increasing operation until the preset high-pressure condition is not met.
In the embodiment, when the compressor is started, the frequency-up operation of the compressor is controlled according to the outdoor environment temperature, the matching of the refrigerating capacity and the environment temperature can be ensured, so that the high-temperature operation capacity of the air conditioner is improved, and if the preset high-pressure condition is continuously detected to be met, the frequency-up action of the compressor is forbidden while the frequency of the compressor is reduced, so that the pressure overshoot is further avoided.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. An air conditioner, comprising:
a refrigeration system including a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value;
the controller is used for controlling the running frequency of the compressor to reduce a preset frequency value when detecting that a preset high-pressure condition is met under the condition that the starting time of the compressor is shorter than a first preset time; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
2. The air conditioner according to claim 1, further comprising temperature detecting means for detecting an outdoor ambient temperature;
the controller is further configured to:
when the compressor is started, acquiring the current outdoor environment temperature;
determining a target frequency of the compressor according to the current outdoor environment temperature;
controlling the compressor to run up to the target frequency;
the controller is used for increasing the high-pressure times by one while controlling the running frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
the controller is further configured to:
and when the high-pressure times are more than one, controlling the compressor to pause the frequency boosting operation until the preset high-pressure condition is not met.
3. The air conditioner according to claim 1, wherein the controller is further configured to increase the number of high pressures by one while controlling the operating frequency of the compressor to decrease by a preset frequency value; wherein the initial value of the high voltage times is zero;
wherein the refrigeration system further comprises an electronic expansion valve for controlling the flow of refrigerant;
the controller is further configured to:
when the starting time of the compressor is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times;
and if the high-pressure times are greater than the preset times, controlling the opening of the electronic expansion valve to increase by a first preset step number, controlling the electronic expansion valve according to a preset valve control strategy, and resetting the high-pressure times.
4. The air conditioner of claim 3, wherein the valve control strategy comprises:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve;
and controlling the electronic expansion valve according to the difference value between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve.
5. The air conditioner according to claim 4, wherein said controlling the opening degree of the electronic expansion valve based on the difference between the target discharge air temperature and the current discharge air temperature of the electronic expansion valve comprises:
when the difference is larger than a first preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a first speed;
when the difference is larger than a second preset difference and the duration reaches a third preset duration, controlling the electronic expansion valve to close at a second speed; wherein the second preset difference is smaller than the first preset difference, and the second speed is smaller than the first speed;
when the difference value is between a second preset difference value and a third preset difference value and the duration time reaches a third preset time length, controlling the electronic expansion valve to close at a third speed; and the third preset difference is smaller than the second preset difference, and the third speed is smaller than the second speed.
6. The air conditioner according to claim 3, wherein said controller is further configured to:
and when the starting time of the compressor is equal to or longer than the first preset time, controlling the opening of the electronic expansion valve to increase by a second preset step number when the preset high-pressure condition is met.
7. The air conditioner according to claim 6, wherein the controller is further configured to increase the number of times of the high pressure by one while controlling the opening degree of the electronic expansion valve to increase by a second preset number of steps;
the controller is further configured to: and when the high-pressure times are more than one, suspending the control of the electronic expansion valve according to a preset valve control strategy until the preset high-pressure condition is not met.
8. The control method of the air conditioner is characterized in that a refrigerating system of the air conditioner comprises a compressor and a pressure switch; the compressor is used for compressing refrigerant; the pressure switch is used for detecting a pressure value in the refrigeration system, switching to a first state when the pressure value is detected to be greater than a preset pressure threshold value, and switching to a second state when the pressure value is detected to be less than or equal to the preset pressure threshold value; the method comprises the following steps:
under the condition that the starting time of the compressor is shorter than a first preset time, controlling the running frequency of the compressor to reduce a preset frequency value when a preset high-pressure condition is detected to be met; the preset high-pressure condition is that the pressure switch is switched from the second state to the first state, and the holding time in the first state reaches a second preset duration.
9. The control method of an air conditioner according to claim 8, characterized in that the method further comprises:
increasing the high pressure times by one while controlling the running frequency of the compressor to reduce a preset frequency value; wherein the initial value of the high voltage times is zero;
wherein the refrigeration system further comprises an electronic expansion valve for controlling the flow of refrigerant;
the method further comprises the following steps:
when the starting time of the compressor is equal to or longer than the first preset time, judging the size relation between the high-pressure times and the preset times;
if the high-pressure times are less than or equal to the preset times, controlling the electronic expansion valve according to a preset valve control strategy, and clearing the high-pressure times;
and if the high-pressure times are greater than the preset times, controlling the opening of the electronic expansion valve to increase by a first preset step number, controlling the electronic expansion valve according to a preset valve control strategy, and resetting the high-pressure times.
10. The control method of an air conditioner according to claim 9, wherein the valve control strategy includes:
acquiring a target exhaust temperature and a current exhaust temperature of the electronic expansion valve;
and controlling the electronic expansion valve according to the difference value between the target exhaust temperature and the current exhaust temperature of the electronic expansion valve.
CN202211180498.5A 2022-09-27 2022-09-27 Air conditioner and control method thereof Pending CN115628518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211180498.5A CN115628518A (en) 2022-09-27 2022-09-27 Air conditioner and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211180498.5A CN115628518A (en) 2022-09-27 2022-09-27 Air conditioner and control method thereof

Publications (1)

Publication Number Publication Date
CN115628518A true CN115628518A (en) 2023-01-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
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