CN113719930B - Exhaust pressure adjusting method and device and air conditioner - Google Patents

Exhaust pressure adjusting method and device and air conditioner Download PDF

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Publication number
CN113719930B
CN113719930B CN202110909734.1A CN202110909734A CN113719930B CN 113719930 B CN113719930 B CN 113719930B CN 202110909734 A CN202110909734 A CN 202110909734A CN 113719930 B CN113719930 B CN 113719930B
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temperature
pressure
air conditioner
pipeline
voltage switch
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CN113719930A (en
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刘敏
邓赛峰
刘合心
陈华
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an exhaust pressure adjusting method, an exhaust pressure adjusting device and an air conditioner, which relate to the technical field of air conditioners and are applied to the air conditioner, wherein a first high-voltage switch and a second high-voltage switch are arranged on an exhaust pipeline of a compressor of the air conditioner, and the pressure cut-off value of the first high-voltage switch is smaller than that of the second high-voltage switch, and the exhaust pressure adjusting method comprises the following steps: acquiring the high-pressure saturation temperature of the air conditioner; detecting the opening and closing state of the first high-voltage switch; and controlling the compressor and the outer fan according to the high-pressure saturation temperature and the opening and closing state. The invention can realize the adjustment of the exhaust pressure of the air conditioner, so that the exhaust pressure is in a reasonable interval, the frequent protection shutdown is avoided, the running stability of the air conditioner is improved, and the use experience of a user is improved.

Description

Exhaust pressure adjusting method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an exhaust pressure adjusting method and device and an air conditioner.
Background
At present, in the operation process of an air conditioner, a refrigerant forms high pressure at the exhaust side of a compressor, but a pipeline has a certain pressure-resistant limit, and the exhaust pressure needs to be controlled within a reasonable range to ensure the stable operation of the air conditioner. Because the protection value of the pressure switch is usually a fixed value, only protection judgment can be carried out, and exhaust pressure cannot be detected or judged in advance in real time, the air conditioner is easily protected and shut down frequently, and the use experience of a user is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides an exhaust pressure adjusting method, an exhaust pressure adjusting device and an air conditioner, which can adjust the exhaust pressure of the air conditioner, so that the exhaust pressure is in a reasonable interval, frequent protection shutdown is avoided, the running stability of the air conditioner is improved, and the use experience of a user is improved.
According to an embodiment of the present invention, in one aspect, there is provided an exhaust pressure adjusting method applied to an air conditioner, where a first high-voltage switch and a second high-voltage switch are disposed on a compressor exhaust pipeline of the air conditioner, and a pressure cut-off value of the first high-voltage switch is smaller than a pressure cut-off value of the second high-voltage switch, the exhaust pressure adjusting method including: acquiring the high-pressure saturation temperature of the air conditioner; detecting the opening and closing state of the first high-voltage switch; and controlling the compressor and the outer fan according to the high-pressure saturation temperature and the opening and closing state.
By adopting the technical scheme, the pressure interval where the exhaust pressure is located can be determined, the variation trend of the exhaust pressure is pre-judged, the exhaust pressure is pre-regulated, the exhaust pressure is in a reasonable interval, the air conditioner is prevented from being frequently protected and shut down, the running stability of the air conditioner is improved, and the use experience of a user is improved.
Preferably, the step of obtaining the high pressure saturation temperature of the air conditioner includes: when the current operation mode of the air conditioner is a refrigeration mode, detecting the pipeline temperature of an outdoor heat exchanger to obtain a first pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the first pipeline temperature; when the current operation mode of the air conditioner is a heating mode, detecting the pipeline temperature of the indoor heat exchanger to obtain a second pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the second pipeline temperature.
By adopting the technical scheme, because the exhaust pressure is related to the high-pressure of the air conditioner, the outdoor heat exchanger is positioned at the high-pressure side when the air conditioner is in the refrigeration mode, the indoor heat exchanger is positioned at the high-pressure side when the air conditioner is in the heating mode, the high-pressure saturation temperature is determined according to the pipeline temperature of the outdoor heat exchanger in the refrigeration mode, and the high-pressure saturation temperature is determined according to the pipeline temperature of the indoor heat exchanger in the heating mode, so that the accuracy of determining the high-pressure saturation temperature can be improved, and the accurate adjustment of the exhaust pressure is realized.
Preferably, when the operation mode is a cooling mode, the calculation formula of the high-pressure saturation temperature is as follows: tpc (T) ═ tc (T) + Δ T1; when the operation mode is the heating mode, the calculation formula of the high-pressure saturation temperature is as follows: tph (T) ═ th (T) + Δ T2; the temperature control method comprises the following steps of obtaining a temperature value of an air conditioner in a heating mode, wherein the temperature value of the air conditioner in the heating mode is Tpc (T), Tc (T), Tph (T), Th (T), Tt 1 and DeltaT 2, and the temperature value of the air conditioner in the heating mode is Tp.
By adopting the technical scheme, the temperature compensation is carried out on the pipeline temperature of the outdoor heat exchanger in the cooling mode, and the temperature compensation is carried out on the pipeline temperature of the indoor heat exchanger in the heating mode, so that the high-pressure saturation temperature of the air conditioner in the cooling mode and the heating mode can be accurately obtained.
Preferably, the step of determining the refrigeration temperature compensation value includes: determining the refrigeration temperature compensation value Δ T1 ═ Kc1 when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | ≦ N; wherein N and Kc1 are constants; determining the refrigeration temperature compensation value Δ T1 ═ Kc1 ═ Tc (T)/Tc (T-1) | > N when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | > N;
the determining step of the heating temperature compensation value includes: when the second pipeline temperature meets | Th (T) -Th (T-1) | ≦ M, determining the heating temperature compensation value DeltaT 2 ═ Kc 2; wherein M and Kc2 are constants; when the second pipeline temperature meets | Th (T) -Th (T-1) | > M, determining the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
By adopting the technical scheme, the refrigerating temperature compensation value is determined according to the variation of the pipeline temperature of the outdoor heat exchanger in the adjacent period, and the heating temperature compensation value is determined according to the variation of the pipeline temperature of the indoor heat exchanger in the adjacent period, so that the calculated high-pressure saturation temperature can accurately reflect the variation trend of the exhaust temperature, and a reliable basis is provided for the adjustment of the exhaust temperature.
Preferably, the step of controlling the compressor and the external fan according to the high pressure saturation temperature and the open/close state includes: when the first high-pressure switch is in a pull-in state, acquiring the current high-pressure saturation temperature; when the high-pressure saturation temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; and when the high-pressure saturation temperature is higher than the second preset temperature, periodically controlling the compressor to reduce the first preset frequency until the high-pressure saturation temperature is lower than or equal to the second preset temperature or the compressor reduces the lowest frequency.
By adopting the technical scheme, when the first high-pressure switch is in the attraction state, the outer fan is controlled to operate at the highest rotating speed and the compressor is controlled to prohibit the frequency increasing or frequency reducing when the high-pressure saturation temperature is higher, so that the exhaust pressure is prevented from being too large, the exhaust pressure is in a reasonable interval range, and the operation reliability of the compressor is ensured.
Preferably, the exhaust pressure adjusting method further includes: when the first high-voltage switch is in an off state and the second high-voltage switch is in an attraction state, acquiring a target high-voltage saturation temperature when the first high-voltage switch is off; when the high-pressure saturation temperature is greater than a first preset threshold and less than or equal to a second preset threshold, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; wherein the first preset threshold and the second preset threshold are related to the target high pressure saturation temperature; when the high-pressure saturation temperature is greater than the second preset threshold, periodically controlling the compressor to reduce a first preset frequency until the high-pressure saturation temperature is less than or equal to the second preset threshold or the compressor is reduced to the lowest frequency; and when the high-pressure saturation temperature is less than or equal to the first preset threshold value, stopping controlling the outer fan and the compressor.
By adopting the technical scheme, the pressure interval where the exhaust pressure is located can be accurately judged according to the combined opening and closing state of the first high-voltage switch and the second high-voltage switch, the operation frequency of the compressor and the rotating speed of the outer fan are controlled continuously on the basis of the high-pressure saturation temperature, frequent air conditioner protective shutdown caused by further rising of the exhaust pressure is effectively avoided, and the operation stability of the air conditioner is improved.
Preferably, a check valve is disposed on an exhaust pipeline of a compressor of the air conditioner, the first high-pressure switch and the second high-pressure switch are located on an inlet side of the check valve, and the exhaust pressure adjusting method further includes: when the second high-voltage switch is in an off state, controlling the compressor to stop running and controlling the air conditioner to stop for protection; and when the first high-voltage switch and the second high-voltage switch are changed from an off state to an attraction state, the air conditioner is controlled to start and operate.
By adopting the technical scheme, the air conditioner is controlled to be shut down and protected when the second high-voltage switch is switched off, potential safety hazards caused by overhigh exhaust pressure on the air conditioner are avoided, the running safety of the air conditioner is improved, and the running stability of the air conditioner is ensured by controlling the air conditioner to be started and run when the exhaust pressure is reduced to a safety interval.
According to an embodiment of the present invention, in another aspect, there is provided an exhaust pressure adjusting device applied to an air conditioner, a first high-voltage switch and a second high-voltage switch are disposed on a compressor exhaust pipeline of the air conditioner, a pressure cut-off value of the first high-voltage switch is smaller than a pressure cut-off value of the second high-voltage switch, the exhaust pressure adjusting device includes: the acquisition module is used for acquiring the high-pressure saturation temperature of the air conditioner; the detection module is used for detecting the opening and closing state of the first high-voltage switch; and the control module is used for controlling the compressor and the outer fan according to the high-pressure saturation temperature and the opening and closing state.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner including a computer readable storage medium storing a computer program and a processor, wherein a first high voltage switch, a second high voltage switch and a check valve are arranged on a compressor exhaust pipeline of the air conditioner, the first high voltage switch and the second high voltage switch are located on an inlet side of the check valve, and the computer program is read and executed by the processor to implement the method according to any one of the first aspect.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: the air conditioner control method comprises the steps that a first high-voltage switch and a second high-voltage switch are additionally arranged on an exhaust pipeline of the compressor, the on-off state of the first high-voltage switch is obtained, the pressure interval where the exhaust pressure is located can be determined, the variation trend of the exhaust pressure can be judged in advance by obtaining the exhaust saturation temperature, the compressor and an outer fan are controlled through the on-off state based on the high-pressure saturation temperature and the first high-voltage switch, the exhaust pressure can be adjusted, the exhaust pressure is enabled to be in a reasonable interval, frequent protection shutdown of the air conditioner is avoided, the running stability of the air conditioner is improved, and the use experience of a user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural diagram of an air conditioner according to the present invention;
FIG. 2 is a flow chart of an exhaust pressure regulation method provided by the present invention;
FIG. 3 is a flow chart of an exhaust pressure regulation provided by the present invention;
fig. 4 is a schematic structural diagram of an exhaust pressure regulating device provided by the invention.
Description of reference numerals:
101-a compressor; 102-an exhaust line; 103-a first high voltage switch; 104-a second high voltage switch; 105-a one-way valve; 106-four-way reversing valve; 107-external fan; 108-outdoor line temperature sensor; 109-outdoor heat exchanger; 110-a throttling device; 111-indoor line temperature sensor; 112-indoor heat exchanger; 113-return gas line.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The present embodiment provides an air conditioner, referring to the schematic structural diagram of the air conditioner shown in fig. 1, the air conditioner includes a compressor 101, a discharge pipe 102, a first high-voltage switch 103, a second high-voltage switch 104, a check valve 105, a four-way reversing valve 106, an external fan 107, an outdoor pipe temperature sensor 108, an outdoor heat exchanger 109, a throttling device 110, an indoor pipe temperature sensor 111, an indoor heat exchanger 112, and a return pipe 113.
As shown in fig. 1, the first high-voltage switch 103 and the second high-voltage switch 104 are both installed on the exhaust pipe 102 of the compressor 101, and the first high-voltage switch 103 and the second high-voltage switch 104 are located on the inlet side of the check valve 105, so as to improve the accuracy of exhaust pressure detection, avoid the influence on the normal determination of the high-voltage switch when the check valve is reversely installed or is blocked, and prevent erroneous determination.
The present embodiment provides an exhaust pressure adjusting method, which can be applied to the air conditioner provided in the above embodiment, referring to the flow chart of the exhaust pressure adjusting method shown in fig. 2, the method mainly includes the following steps S202 to S206:
step S202: and acquiring the high-pressure saturation temperature of the air conditioner.
The method comprises the steps of collecting the temperature of a pipeline of the air conditioner based on a temperature sensor, carrying out certain temperature compensation on the temperature of the pipeline according to the corresponding relation between the pressure and the temperature of a refrigerant, and calculating to obtain the saturation temperature corresponding to the pressure, namely the high-pressure saturation temperature.
Step S204: the open/close state of the first high-voltage switch is detected.
And detecting the opening and closing states of the first high-voltage switch and the second high-voltage switch in real time, wherein the value range of the pressure opening value of the first high-voltage switch can be 3.2-4.0 MPa, and the value range of the suction value of the first high-voltage switch can be 2.6-3.2 MPa. When the exhaust pressure in the exhaust pipeline is smaller than the attraction value, the first high-pressure switch is in the attraction state, when the exhaust pressure rises to be larger than the attraction value and smaller than the pressure disconnection value, the first high-pressure switch keeps the attraction state, and when the exhaust pressure continues to rise to be larger than the pressure disconnection value, the first high-pressure switch is changed from the attraction state to the disconnection state. When the exhaust pressure in the exhaust pipeline is reduced from a value larger than the pressure disconnection value to a value larger than the suction value and smaller than the pressure disconnection value, the first high-pressure switch is kept in a disconnection state, and when the exhaust pressure in the exhaust pipeline is continuously reduced to a value smaller than the suction value, the first high-pressure switch is changed from the disconnection state to the suction state. In the same way, the action change process of the second high-voltage switch can also be obtained.
The air conditioner is characterized in that a first high-pressure switch and a second high-pressure switch are arranged on an exhaust pipeline of a compressor of the air conditioner, in order to improve the adjusting effect of the exhaust pressure, the pressure disconnection value of the first high-pressure switch is smaller than that of the second high-pressure switch, and the suction value of the first high-pressure switch is smaller than that of the second high-pressure switch. The value range of the pressure disconnection value of the second high-voltage switch can be 3.6-4.5 MPa, and the value range of the suction value of the second high-voltage switch can be 3.0-3.7 MPa.
Step S206: and controlling the compressor and the outer fan according to the high-pressure saturation temperature and the opening and closing state.
The two high-pressure switches with different pressure cut-off values are arranged on the exhaust pipeline of the compressor, the range of the exhaust pressure in the exhaust pipeline can be determined according to the opening and closing states of the two high-pressure switches, and the variation trend of the exhaust pressure can be judged in advance by acquiring the high-pressure saturation temperature of the air conditioner. By controlling the compressor and the outer fan according to the high-pressure saturation temperature and the opening and closing state, the exhaust pressure can be adjusted in advance before reaching the preset pressure protection value, and the air conditioner is prevented from being stopped frequently.
According to the exhaust pressure adjusting method provided by the embodiment, the first high-voltage switch and the second high-voltage switch are additionally arranged on the exhaust pipeline of the compressor, the switch state of the first high-voltage switch is obtained, the pressure interval where the exhaust pressure is located can be determined, the variation trend of the exhaust pressure can be pre-judged by obtaining the exhaust saturation temperature, the compressor and the outer fan are controlled based on the high-pressure saturation temperature and the switching state of the first high-voltage switch, the exhaust pressure can be adjusted, the exhaust pressure is in a reasonable interval, frequent protection shutdown of the air conditioner is avoided, the running stability of the air conditioner is improved, and the use experience of a user is improved.
In order to improve the accuracy of the exhaust pressure regulation, the present embodiment provides an implementation manner of obtaining the high pressure saturation temperature of the air conditioner, which may be specifically executed with reference to the following steps (1) to (2):
step (1): when the current operation mode of the air conditioner is a refrigeration mode, detecting the pipeline temperature of the outdoor heat exchanger to obtain a first pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the first pipeline temperature.
The method comprises the steps of obtaining the current operation mode of the air conditioner, and detecting the pipeline temperature of the outdoor heat exchanger in real time or at preset time intervals based on a temperature sensor when the air conditioner operates in a refrigeration mode, and recording the pipeline temperature as a first pipeline temperature.
When the operation mode of the air conditioner is a refrigeration mode, the calculated high-pressure saturation temperature is recorded as tpc (t), and the calculation formula of the high-pressure saturation temperature is as follows: tpc (T) ═ tc (T) + Δ T1; tc (T) is a first pipeline temperature detected in the current period T, that is, the pipeline temperature of the outdoor heat exchanger detected in the current time T or the T-th period, Δ T1 is a refrigeration temperature compensation value, and the refrigeration temperature compensation value is related to the variation of the first pipeline temperature.
In a possible embodiment, the step of determining the refrigeration temperature compensation value Δ T1 includes:
when the first pipeline temperature meets | Tc (T) -Tc (T-1) | ≦ N, determining the refrigeration temperature compensation value DeltaT 1 ═ Kc 1; where N and Kc1 are constants. The value range of N can be 0-3 ℃, Kc1 is a fixed value and can be determined according to historical operating data of the air conditioner or determined by a test for detecting the high-pressure saturation temperature of the compressor. Tc (t-1) is the first pipeline temperature detected in the last period t-1, namely the pipeline temperature of the outdoor heat exchanger detected in the last time t-1 or the t-1 th period.
When the variation of the pipeline temperature in the adjacent period is small, namely when the absolute value of Tc (t) (t-1) is less than or equal to N, the pressure fluctuation in the pipeline is determined to be small, the air conditioner system operates stably, the refrigerating temperature compensation value can be a fixed value, and the rationality and the accuracy of determining the high-pressure saturation temperature are improved.
When the first circuit temperature satisfies | Tc (T) -Tc (T-1) | > N, the refrigeration temperature compensation value DeltaT 1 is determined to be Kc1 | Tc (T)/Tc (T-1) |.
When the variation of the pipeline temperature in the adjacent period is large, namely when the | Tc (T) -Tc (T-1) | > N, the pipeline temperature is in rapid variation, the air conditioner system is in an unstable state, the temperature response has certain hysteresis in consideration of the temperature variation speed being smaller than the pressure variation speed, the compensation value needs to be corrected, and the refrigeration temperature compensation value Δ T1 is made to be Kc × | Tc (T)/Tc (T-1) |, so that the calculated high-pressure saturation temperature can accurately reflect the variation trend of the exhaust pressure.
Step (2): and when the current operation mode of the air conditioner is a heating mode, detecting the pipeline temperature of the indoor heat exchanger to obtain a second pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the second pipeline temperature.
When the air conditioner operates in the heating mode, the pipeline temperature of the indoor heat exchanger is detected in real time or at preset time intervals based on the temperature sensor, and is recorded as a second pipeline temperature.
When the operation mode of the air conditioner is a heating mode, the calculated high-pressure saturation temperature is recorded as Tph (t), and the calculation formula of the high-pressure saturation temperature is as follows: tph (T) ═ th (T) + Δ T2; th (T) is a second pipeline temperature detected in the current period T, that is, the pipeline temperature of the indoor heat exchanger detected at the current time T or in the T-th period, Δ T2 is a heating temperature compensation value, and the heating temperature compensation value is related to the variation of the second pipeline temperature.
Because the exhaust pressure is related to the high-pressure of the air conditioner, the outdoor heat exchanger is positioned at the high-pressure side when the air conditioner is in a refrigerating mode, the indoor heat exchanger is positioned at the high-pressure side when the air conditioner is in a heating mode, the high-pressure saturation temperature is determined according to the pipeline temperature of the outdoor heat exchanger in the refrigerating mode, and the high-pressure saturation temperature is determined according to the pipeline temperature of the indoor heat exchanger in the heating mode, so that the accuracy of determining the high-pressure saturation temperature can be improved, and the accurate adjustment of the exhaust pressure is further realized.
In a possible embodiment, the step of determining the heating temperature compensation value Δ T2 includes:
when the second pipeline temperature meets | Th (T) -Th (T-1) | ≦ M, determining the heating temperature compensation value DeltaT 2 ═ Kc 2; where M and Kc2 are constants. The value range of M can be 0-3 ℃, Kc2 is a fixed value and can be determined according to historical operating data of the air conditioner or determined by a test for detecting the high-pressure saturation temperature of the compressor. Th (t-1) is the second pipeline temperature detected in the last period t-1, namely the pipeline temperature of the indoor heat exchanger detected in the last time t-1 or the t-1 Th period.
In the heating mode, when the variation of the temperature of the pipeline of the indoor heat exchanger in the adjacent period is small, namely | Th (t) -Th (t-1) | is less than or equal to M, the pressure fluctuation in the pipeline is determined to be small, the air conditioner system is stable in operation, the refrigerating temperature compensation value can be a fixed value at the moment, and the rationality and the accuracy of the determination of the high-pressure saturation temperature are improved.
When the second pipeline temperature satisfies | Th (T) -Th (T-1) | > M, the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
When the variation of the pipe temperature of the indoor heat exchanger in the adjacent period is large, namely when the absolute value of Th (T) -Th (T-1) | > M, the pipe temperature of the indoor heat exchanger is in rapid change, the air conditioner system is in an unstable state, the temperature response has certain hysteresis in consideration of the fact that the temperature change speed is smaller than the pressure change speed, the compensation value needs to be corrected, and the heating temperature compensation value delta T2 is Kc2 | Tc (T)/Tc (T-1) |, so that the calculated high-pressure saturation temperature can accurately reflect the variation trend of the exhaust pressure.
The refrigerating temperature compensation value is determined according to the variation of the pipeline temperature of the outdoor heat exchanger in the adjacent period, and the heating temperature compensation value is determined according to the variation of the pipeline temperature of the indoor heat exchanger in the adjacent period, so that the high-pressure saturation temperature obtained by calculation can accurately reflect the variation trend of the exhaust temperature, and a reliable basis is provided for the adjustment of the exhaust temperature.
In a specific implementation mode, when the first high-pressure switch is in an attraction state, the current high-pressure saturation temperature is obtained, when the first high-pressure switch is detected to be in the attraction state, the exhaust pressure in the exhaust pipeline does not reach the pressure cut-off value of the first high-pressure switch, and the air conditioner is controlled according to the currently calculated high-pressure saturation temperature.
And when the high-pressure saturation temperature is less than or equal to the first preset temperature, stopping controlling the external fan and the compressor. The value range of the first preset temperature can be 48-54 ℃, when the high-pressure saturation temperature is lower than the first preset temperature, the exhaust pressure is in a reasonable range, the compressor and the outer fan operate in a normal adjusting mode, and the compressor and the outer fan do not need to be controlled.
And when the high-pressure saturation temperature is higher than the first preset temperature and lower than or equal to the second preset temperature, controlling the outer fan to operate at the highest rotating speed, and controlling the compressor to prohibit the frequency from increasing. The second preset temperature can be 54-60 ℃, and the first preset temperature is lower than the second preset temperature. When the high-pressure saturation temperature is higher than the first preset temperature and is lower than or equal to the second preset temperature, indicating that the exhaust pressure is higher, controlling the compressor to prohibit increasing the frequency, only reducing the frequency or maintaining the current frequency to operate so as to avoid the exhaust pressure from continuously increasing, and simultaneously controlling the external fan of the outdoor unit to operate at the highest rotating speed so as to ensure the air volume required by the heat dissipation of the heat exchanger.
And when the high-pressure saturation temperature is higher than the second preset temperature, periodically controlling the compressor to reduce the first preset frequency until the high-pressure saturation temperature is lower than or equal to the second preset temperature or the compressor is reduced to the lowest frequency. And when the high-pressure saturation temperature is higher than the second preset temperature, indicating that the current exhaust pressure is at a higher level, controlling the compressor to reduce by 5-30% on the basis of the current operating frequency at intervals of a certain time (1-3 s) until the high-pressure saturation temperature is reduced to be less than or equal to the second preset temperature or the compressor is reduced to the lowest allowable frequency, and stopping controlling the compressor to reduce the frequency.
When the first high-pressure switch is in an attraction state, the outer fan is controlled to operate at the highest rotating speed and the compressor is controlled to prohibit frequency increasing or frequency reducing when the high-pressure saturation temperature is high, so that the exhaust pressure is prevented from being too high and is in a reasonable interval range, and the operation reliability of the compressor is ensured.
In another specific embodiment, when the first high-voltage switch is in an off state and the second high-voltage switch is in an attraction state, the target high-voltage saturation temperature when the first high-voltage switch is off is obtained. When the first high-voltage switch is changed from the attraction state to the disconnection state, the high-pressure saturation temperature when the first high-voltage switch is disconnected is recorded as a target high-pressure saturation temperature, then the high-pressure saturation temperature corresponding to the pipeline temperature is continuously obtained, and the compressor and the outer fan are controlled according to the change condition of the high-pressure saturation temperature.
When the high-pressure saturation temperature is greater than a first preset threshold and less than or equal to a second preset threshold, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; the first preset threshold and the second preset threshold are related to a target high-pressure saturation temperature, the first preset threshold may be Tpc _ off-a, the second preset threshold may be Tpc _ off + a, Tpc _ off is the target high-pressure saturation temperature, and a value range of a may be 1-8 ℃.
When the first high-voltage switch is switched off, if the detected high-voltage saturation temperature is greater than a first preset threshold and less than or equal to a second preset threshold, the current exhaust pressure is higher, in order to avoid further increase of the exhaust pressure, the compressor is controlled to prohibit increasing of the frequency, the compressor is allowed to reduce the frequency or maintain the current frequency to operate, and the outer fan is controlled to directly increase to the highest rotation speed to operate, so that the heat exchanger can quickly dissipate heat, and the exhaust pressure is prevented from continuously increasing.
And when the high-pressure saturation temperature is greater than a second preset threshold value, periodically controlling the compressor to reduce the first preset frequency until the high-pressure saturation temperature is less than or equal to the second preset threshold value or the compressor reduces to the lowest frequency. If the detected high-pressure saturation temperature rises to be larger than the second preset threshold value, the current exhaust pressure is large, in order to avoid the exhaust pressure from frequently reaching a shutdown protection pressure value, the compressor is controlled to be reduced by 5% -30% on the basis of the current operation frequency at intervals of a certain time (1-3 s), and the compressor is stopped to be controlled to reduce the frequency until the high-pressure saturation temperature is reduced to be smaller than or equal to the second preset temperature or the compressor is reduced to the lowest allowable frequency.
And when the high-pressure saturation temperature is less than or equal to a first preset threshold value, stopping controlling the external fan and the compressor. And if the detected high-pressure saturation temperature is reduced to be smaller than a first preset threshold value, determining that the current exhaust pressure is restored to a reasonable interval range, normally adjusting the air conditioner, canceling the limitation on the compressor and the outdoor fan, and stopping controlling the compressor and the outdoor fan.
The pressure interval of the exhaust pressure can be accurately judged by detecting the combined opening and closing state of the first high-voltage switch and the second high-voltage switch, when the first high-voltage switch is in the off state and the second high-voltage switch is in the suction state, the current exhaust pressure is larger than the pressure off value of the first high-voltage switch and smaller than the pressure off value of the second high-voltage switch, the operation frequency of the compressor and the rotating speed of the external fan are continuously controlled based on the high-pressure saturation temperature, the frequent protective shutdown of the air conditioner caused by the further rise of the exhaust pressure is effectively avoided, and the operation stability of the air conditioner is improved.
In a possible embodiment, a check valve is disposed on a compressor discharge pipeline of the air conditioner, and the first high-pressure switch and the second high-pressure switch are located on an inlet side of the check valve, and the discharge pressure regulating method further includes:
and when the second high-voltage switch is in an off state, controlling the compressor to stop running and controlling the air conditioner to stop for protection. The pressure cut-off value of the second high-voltage switch can be the same as the preset pressure protection value of the air conditioner, and because the pressure cut-off value of the second high-voltage switch is larger than the pressure cut-off value of the first high-voltage switch, when the second high-voltage switch is detected to be changed from the attraction state to the cut-off state, namely, the first high-voltage switch and the second high-voltage switch are both in the cut-off state, the current exhaust pressure is shown to exceed the pressure cut-off value of the second high-voltage switch, and the exhaust pressure reaches the preset pressure protection value, the compressor is controlled to stop running, and the air conditioner enters the shutdown protection state.
When the first high-voltage switch and the second high-voltage switch are changed from the off state to the suction state, the air conditioner is controlled to start and operate. When the first high-pressure switch and the second high-pressure switch are detected to be switched into the attraction state, the current exhaust pressure in the exhaust pipeline of the compressor is restored to a safety interval, the air conditioner is allowed to start to operate again, and otherwise, the air conditioner is always in the shutdown protection state.
According to the exhaust pressure adjusting method provided by the embodiment, the temperature compensation value is dynamically corrected by acquiring the temperature of the pipeline, so that the calculation of the high-pressure saturation temperature is more accurate, the exhaust gas pressure is pre-judged and adjusted by installing the plurality of high-pressure switches on the exhaust pipeline of the compressor and acquiring the temperature of the pipeline, the frequency of the compressor and the rotating speed of the outer fan are timely adjusted when the high-pressure switches act, so that the exhaust gas pressure is adjusted more accurately, the air conditioner is prevented from being frequently protected and stopped, the running stability of the air conditioner is improved, and the running reliability of the compressor is ensured.
Corresponding to the exhaust pressure adjusting method provided by the above embodiment, the embodiment of the present invention provides an example of adjusting the exhaust pressure of the air conditioner compressor by applying the exhaust pressure adjusting method, referring to the exhaust pressure adjusting flowchart shown in fig. 3, and specifically referring to the following steps S301 to S308:
step S301: pipeline temperature is gathered based on temperature sensor.
When the air conditioner is in a cooling mode, the temperature of the pipeline of the outdoor heat exchanger is collected based on the temperature sensor. When the air conditioner is in a heating mode, the temperature of the pipeline of the indoor heat exchanger is collected based on the temperature sensor.
Step S302: and calculating a temperature compensation value based on the temperature of the pipeline, and calculating the high-pressure saturation temperature corresponding to the pressure.
According to the corresponding relation between the pressure and the temperature of the refrigerant, the temperature of the pipeline is collected by using a temperature sensor, and the high-pressure saturation temperature corresponding to the pressure is calculated through certain temperature compensation.
Calculating a high-pressure saturation temperature tpc (T) ═ tc (T) + Δ T1 during the operation of the air conditioner in the cooling mode; tc (T) is the pipe temperature of the outdoor heat exchanger detected in the current period T, and Δ T1 is the refrigeration temperature compensation value.
When the variation of the pipeline temperature Tc is smaller in two continuous periods, namely | Tc (T) — Tc (T-1) | ≦ N, the pressure fluctuation in the pipeline at the moment is judged to be smaller, the operation of the air conditioning system is more stable, and the temperature compensation value delta T1 is Kc (the Kc value is determined according to the experimental result and is generally a fixed value).
When the pipeline temperature Tc does not satisfy | Tc (T) -Tc (T-1) | ≦ N (preferably 0-3 ℃), namely the pipeline temperature is in rapid change, the operation of the air conditioning system is judged to be in an unsteady state at the moment, and the temperature response has certain hysteresis in consideration of the fact that the change speed of the temperature is smaller than the change speed of the pressure, so that the temperature compensation value needs to be corrected, and the delta T1 is made to be Kc | Tc (T)/Tc (T-1) |.
Calculating a high-pressure saturation temperature tph (T) ═ th (T) + Δ T2 when the air conditioner is in the heating mode operation process; th (T) is the pipe temperature of the indoor heat exchanger detected in the current period T, and Δ T2 is the heating temperature compensation value. The heating temperature compensation value is determined according to the change rule of Th (t) and Th (t-1) and referring to the refrigeration mode.
When the variation of the pipeline temperature Th is small in two continuous periods, namely | Th (T) -Th (T-1) | is less than or equal to M, determining a heating temperature compensation value DeltaT 2 ═ Kc 2; where M and Kc2 are constants. When the second pipeline temperature satisfies | Th (T) -Th (T-1) | > M, the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
Step S303: and judging whether the first high-voltage switch is disconnected, if so, executing step S305, and if not, executing step S304.
And detecting the opening and closing state of the first high-voltage switch, and judging whether the first high-voltage switch is in an off state.
Step S304: and adjusting the frequency of the compressor and the rotating speed of the outer fan according to the high-pressure saturation temperature.
When the first high-voltage switch is detected to be in a closed state (namely the preset pressure is not reached), the following control is carried out according to the calculated high-voltage saturation temperature:
when the air conditioner meets the conditions of Tpc (T) is less than or equal to T1 (preferably 48-54 ℃) or Tph (T) is less than or equal to T1, the exhaust pressure of the air conditioner is judged to be in a reasonable range, and the compressor, the fan and the like are normally adjusted.
When T1 < Tpc (T) ≦ T2 (preferably 54-60 ℃) or T1 < Tph (T) ≦ T2 is met, the exhaust pressure of the air conditioner is judged to be close to a safety value at the moment, the compressor is controlled to prohibit increasing the frequency, the frequency is allowed to be reduced or the current frequency is maintained to run, and meanwhile, the outdoor fan is controlled to run at the highest rotating speed, so that the air volume required by heat dissipation of the heat exchanger is ensured.
When the condition of Tpc (T) > T2 or Tph (T) > T2 is met, the exhaust pressure of the air conditioner is judged to be larger than the allowable safety range at the moment, the compressor is controlled to be reduced by X percent (preferably 5-30) from the current frequency, and the adjustment is carried out once every period until the condition of Tpc (T) ≦ T2(Tpc (T) ≦ T2) or the compressor is reduced to the allowable lowest frequency.
Step S305: judging whether the second high-voltage switch is disconnected or not, if so, executing step S306; if not, step S307 is executed.
Step S306: and controlling the air conditioner to be protected and shut down, and controlling the air conditioner to quit the protection and shut down when the first high-voltage switch and the second high-voltage switch are both attracted.
When the second high-voltage switch is detected to be switched off, the exhaust pressure is judged to exceed a second safety value, the compressor is controlled to stop running, the air conditioner enters a shutdown protection state, when the second high-voltage switch and the first high-voltage switch are detected to be in the attraction state, the exhaust pressure at the moment is judged to be recovered to a safety interval, the air conditioner is allowed to be started again to run, and otherwise, the air conditioner is always in the protection shutdown state.
And when the air conditioning unit is started again after entering the protection shutdown, resetting the last recorded Tpc _ off value when the first high-voltage switch is switched off, and adjusting the exhaust pressure according to the recalculated saturation temperature.
In order to achieve a good exhaust pressure regulating effect, the turn-off value of the first high-voltage switch needs to be smaller than that of the second high-voltage switch, so that the second high-voltage switch is prevented from being frequently turned off. Similarly, the actuation value of the first high-voltage switch should also be smaller than the actuation value of the second high-voltage switch, for example, the off value of the first high-voltage switch is preferably 3.2 to 4.0MPa, the actuation value is preferably 2.6 to 3.2MPa, the off value of the second high-voltage switch is preferably 3.6 to 4.5MPa, and the actuation value is preferably 3.0 to 3.7 MPa.
It should be noted that, according to the type of the refrigerant allowed to be used by the air conditioner, the off value and the on value of the first high-pressure switch and the second high-pressure switch need to be determined again according to experiments to meet the pressure operation ranges of different compressors.
The first high-voltage switch and the second high-voltage switch are both installed on an exhaust pipeline of the compressor, and if the pipeline is provided with the check valve, the first high-voltage switch and the second high-voltage switch are both installed on the inlet side of the check valve so as to improve the detection accuracy of the exhaust pressure, avoid the influence on the normal judgment of the high-voltage switch when the check valve is reversely installed or blocked and prevent the misjudgment.
Step S307: and recording the target high-voltage saturation temperature when the first high-voltage switch is switched off.
When the action (disconnection) of the first high-voltage switch is detected, the high-voltage saturation temperature when the first high-voltage switch is disconnected is recorded and recorded as a target high-voltage saturation temperature Tpc _ off.
Step S308: and adjusting the frequency of the compressor and the rotating speed of the outer fan according to the high-pressure saturation temperature and the target high-pressure saturation temperature until the first high-pressure switch is closed.
When the condition that the frequency of the compressor is not increased (A is preferably 1-8) is met, wherein the frequency of the compressor is not increased, the frequency is allowed to be reduced or the current frequency is maintained to be operated, and the outdoor fan is controlled to be directly adjusted to the highest rotating speed to be operated when the condition that the frequency of the compressor is not increased (Tpc _ off-A is less than Tpc (t) and not more than Tpc _ off + A or the frequency of the compressor is not increased (t) and not more than Tpc _ off + A is met (A is preferably 1-8).
When the exhaust pressure meets Tpc (t) > Tpc _ off + A or Tph (t) > Tpc _ off + A, the exhaust pressure is judged to exceed a reasonable interval, the compressor is controlled to directly reduce the current frequency by X percent to operate, and the adjustment is carried out once in each period until the conditions that the Tpc (t) ≦ Tpc _ off + A (Tph (t) ≦ Tpc _ off + A) or the compressor is reduced to the lowest allowable frequency are met, so that the aim of adjusting the exhaust pressure is fulfilled.
When the exhaust pressure meets the condition that the exhaust pressure is restored to a reasonable interval, the air conditioner performs normal regulation and cancels the limitation on the compressor and the outdoor fan when the exhaust pressure meets the condition that the exhaust pressure is not less than Tpc (t) and not more than Tpc _ off-A or the exhaust pressure is not more than tph (t) and not more than Tpc _ off-A.
Corresponding to the exhaust pressure adjusting method provided by the above embodiment, an embodiment of the present invention provides an exhaust pressure adjusting device, which may be applied to an air conditioner, where a first high-voltage switch and a second high-voltage switch are disposed on a compressor exhaust pipeline of the air conditioner, and a pressure cut-off value of the first high-voltage switch is smaller than a pressure cut-off value of the second high-voltage switch, see a schematic structural diagram of the exhaust pressure adjusting device shown in fig. 4, and the device includes the following modules:
and the obtaining module 41 is used for obtaining the high-pressure saturation temperature of the air conditioner.
And the detection module 42 is used for detecting the opening and closing states of the first high-voltage switch.
And the control module 43 is used for controlling the compressor and the external fan according to the high-pressure saturation temperature and the opening and closing state.
The above exhaust pressure adjusting device provided by this embodiment, through add first high voltage switch and second high voltage switch on the exhaust pipeline of compressor, acquire the on-off state of first high voltage switch, can confirm the pressure interval that the exhaust pressure is located, can predetermine the trend of change of exhaust pressure through acquiring exhaust saturation temperature, control compressor and outer fan through the on-off state based on high pressure saturation temperature and first high voltage switch, can realize the regulation to the exhaust pressure, make the exhaust pressure be in reasonable interval, avoid the frequent protection of air conditioner to shut down, the stability of air conditioner operation has been promoted, user's use experience has been promoted.
In an embodiment, the obtaining module 41 is further configured to, when the current operation mode of the air conditioner is a cooling mode, detect a pipeline temperature of the outdoor heat exchanger to obtain a first pipeline temperature, and determine a high-pressure saturation temperature of the air conditioner according to the first pipeline temperature; and when the current operation mode of the air conditioner is a heating mode, detecting the pipeline temperature of the indoor heat exchanger to obtain a second pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the second pipeline temperature.
In one embodiment, when the operation mode is the cooling mode, the calculation formula of the high pressure saturation temperature is as follows: tpc (T) ═ tc (T) + Δ T1; when the operation mode is the heating mode, the calculation formula of the high-pressure saturation temperature is as follows: tph (T) ═ th (T) + Δ T2; wherein, tpc (T) is the high-pressure saturation temperature of the air conditioner in the cooling mode, tc (T) is the first pipeline temperature detected in the current period T, tph (T) is the high-pressure saturation temperature of the air conditioner in the heating mode, th (T) is the second pipeline temperature detected in the current period T, Δ T1 is the cooling temperature compensation value, and Δ T2 is the heating temperature compensation value.
In an embodiment, the obtaining module 41 is further configured to determine the cooling temperature compensation value Δ T1 ═ Kc1 when the first pipeline temperature satisfies | Tc (T) -Tc (T-1) | ≦ N; wherein N and Kc1 are constants; when the first pipeline temperature meets | Tc (T) -Tc (T-1) | > N, determining a refrigerating temperature compensation value Delta T1 ═ Kc1 | Tc (T)/Tc (T-1) |; when the second pipeline temperature meets | Th (T) -Th (T-1) | ≦ M, determining the heating temperature compensation value DeltaT 2 ═ Kc 2; wherein M and Kc2 are constants; when the second pipeline temperature satisfies | Th (T) -Th (T-1) | > M, the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
In an embodiment, the control module 43 is further configured to obtain a current high-pressure saturation temperature when the first high-pressure switch is in an actuation state; when the high-pressure saturation temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; and when the high-pressure saturation temperature is higher than the second preset temperature, periodically controlling the compressor to reduce the first preset frequency until the high-pressure saturation temperature is lower than or equal to the second preset temperature or the compressor is reduced to the lowest frequency.
In an embodiment, the control module 43 is further configured to obtain a target high-voltage saturation temperature when the first high-voltage switch is turned off when the first high-voltage switch is in an off state and the second high-voltage switch is in an attraction state; when the high-pressure saturation temperature is greater than a first preset threshold and less than or equal to a second preset threshold, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; the first preset threshold and the second preset threshold are related to the target high-pressure saturation temperature; when the high-pressure saturation temperature is higher than a second preset threshold value, the compressor is periodically controlled to reduce the first preset frequency until the high-pressure saturation temperature is lower than or equal to the second preset threshold value or the compressor is reduced to the lowest frequency; and when the high-pressure saturation temperature is less than or equal to a first preset threshold value, stopping controlling the external fan and the compressor.
In one embodiment, a check valve is disposed on a compressor discharge pipeline of the air conditioner, and the first high-voltage switch and the second high-voltage switch are located on an inlet side of the check valve, and the apparatus further includes:
and the shutdown protection module is used for controlling the compressor to stop running and controlling the air conditioner to perform shutdown protection when the second high-voltage switch is in a disconnected state.
And the restarting module is used for controlling the air conditioner to start and run when the first high-voltage switch and the second high-voltage switch are changed from an off state to an on state.
The above-mentioned exhaust pressure adjusting device that this embodiment provided carries out dynamic correction to the temperature compensation value through gathering the pipeline temperature, make the calculation of high pressure saturation temperature more accurate, through installing a plurality of high-voltage switch on compressor exhaust pipe way, and gather pipeline temperature and realized prejudgement and regulation to the exhaust pressure, through in time adjusting compressor frequency and outer fan rotational speed when high-voltage switch moves, make the exhaust pressure adjust more accurately, avoid the air conditioner frequent protection to shut down, the stability of air conditioner operation has been promoted, the reliability of compressor operation has been guaranteed.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the above-mentioned exhaust pressure adjusting method embodiment, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
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.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The exhaust pressure adjusting device and the air conditioner disclosed by the embodiment correspond to the exhaust pressure adjusting method disclosed by the embodiment, so that the description is relatively simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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 (7)

1. The exhaust pressure adjusting method is applied to an air conditioner, a first high-voltage switch and a second high-voltage switch are arranged on an exhaust pipeline of a compressor of the air conditioner, the pressure cut-off value of the first high-voltage switch is smaller than that of the second high-voltage switch, and the exhaust pressure adjusting method comprises the following steps:
acquiring the high-pressure saturation temperature of the air conditioner;
detecting the opening and closing state of the first high-voltage switch;
controlling a compressor and an outer fan according to the high-pressure saturation temperature and the opening and closing state;
the step of obtaining the high pressure saturation temperature of the air conditioner includes: when the current operation mode of the air conditioner is a refrigeration mode, detecting the pipeline temperature of an outdoor heat exchanger to obtain a first pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the first pipeline temperature; when the current operation mode of the air conditioner is a heating mode, detecting the pipeline temperature of an indoor heat exchanger to obtain a second pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the second pipeline temperature;
when the operation mode is a refrigeration mode, the calculation formula of the high-pressure saturation temperature is as follows:
Tpc(t)＝Tc(t)+ΔT1；
when the operation mode is the heating mode, the calculation formula of the high-pressure saturation temperature is as follows:
Tph(t)＝Th(t)+ΔT2；
wherein, tpc (T) is a high-pressure saturation temperature when the air conditioner is in a cooling mode, tc (T) is a first pipeline temperature detected in a current period T, tph (T) is a high-pressure saturation temperature when the air conditioner is in a heating mode, th (T) is a second pipeline temperature detected in the current period T, Δ T1 is a cooling temperature compensation value, and Δ T2 is a heating temperature compensation value;
the step of determining the refrigeration temperature compensation value comprises the steps of: determining the refrigeration temperature compensation value Δ T1 ═ Kc1 when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | ≦ N; wherein N and Kc1 are constants; determining the refrigeration temperature compensation value Δ T1 ═ Kc1 ═ Tc (T)/Tc (T-1) | > N when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | > N; the step of determining the heating temperature compensation value comprises the following steps: when the second pipeline temperature meets | Th (T) -Th (T-1) | ≦ M, determining the heating temperature compensation value DeltaT 2 ═ Kc 2; wherein M and Kc2 are constants; when the second pipeline temperature meets | Th (T) -Th (T-1) | > M, determining the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
2. The discharge pressure adjusting method of claim 1, wherein the step of controlling the compressor and the outer fan according to the high pressure saturation temperature and the open/close state comprises:
when the first high-pressure switch is in a pull-in state, acquiring the current high-pressure saturation temperature; when the high-pressure saturation temperature is higher than a first preset temperature and lower than or equal to a second preset temperature, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency;
and when the high-pressure saturation temperature is higher than the second preset temperature, periodically controlling the compressor to reduce the first preset frequency until the high-pressure saturation temperature is lower than or equal to the second preset temperature or the compressor reduces the lowest frequency.
3. The exhaust pressure regulation method of claim 2, further comprising:
when the first high-voltage switch is in an off state and the second high-voltage switch is in an attraction state, acquiring a target high-voltage saturation temperature when the first high-voltage switch is off;
when the high-pressure saturation temperature is greater than a first preset threshold and less than or equal to a second preset threshold, controlling the outer fan to run at the highest rotating speed, and controlling the compressor to prohibit increasing the frequency; wherein the first preset threshold and the second preset threshold are related to the target high pressure saturation temperature;
when the high-pressure saturation temperature is greater than the second preset threshold, periodically controlling the compressor to reduce a first preset frequency until the high-pressure saturation temperature is less than or equal to the second preset threshold or the compressor is reduced to the lowest frequency;
and when the high-pressure saturation temperature is less than or equal to the first preset threshold value, stopping controlling the outer fan and the compressor.
4. A discharge pressure regulating method as set forth in claim 3, wherein a check valve is provided on a compressor discharge line of the air conditioner, and the first high-pressure switch and the second high-pressure switch are located on an inlet side of the check valve, the discharge pressure regulating method further comprising:
when the second high-voltage switch is in an off state, controlling the compressor to stop running and controlling the air conditioner to stop for protection;
and when the first high-voltage switch and the second high-voltage switch are changed from an off state to an on state, the air conditioner is controlled to start and operate.
5. The utility model provides an exhaust pressure adjusting device which characterized in that is applied to the air conditioner, be provided with first high voltage switch and second high voltage switch on the compressor exhaust pipeline of air conditioner, the pressure disconnection value of first high voltage switch is less than the pressure disconnection value of second high voltage switch, exhaust pressure adjusting device includes:
the acquisition module is used for acquiring the high-pressure saturation temperature of the air conditioner;
the detection module is used for detecting the opening and closing states of the first high-voltage switch;
the control module is used for controlling the compressor and the external fan according to the high-pressure saturation temperature and the opening and closing state;
the acquisition module is further used for detecting the pipeline temperature of the outdoor heat exchanger when the current operation mode of the air conditioner is a refrigeration mode to obtain a first pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the first pipeline temperature; when the current operation mode of the air conditioner is a heating mode, detecting the temperature of a pipeline of an indoor heat exchanger to obtain a second pipeline temperature, and determining the high-pressure saturation temperature of the air conditioner according to the second pipeline temperature; when the operation mode is a refrigeration mode, the calculation formula of the high-pressure saturation temperature is as follows: tpc (T) ═ tc (T) + Δ T1; when the operation mode is the heating mode, the calculation formula of the high-pressure saturation temperature is as follows: tph (T) ═ th (T) + Δ T2; the method comprises the following steps that Tpc (T) is a high-pressure saturation temperature when the air conditioner is in a cooling mode, Tc (T) is a first pipeline temperature detected in a current period T, Tph (T) is a high-pressure saturation temperature when the air conditioner is in a heating mode, Th (T) is a second pipeline temperature detected in the current period T, delta T1 is a cooling temperature compensation value, and delta T2 is a heating temperature compensation value; the determining of the refrigerating temperature compensation value includes: determining the refrigeration temperature compensation value Δ T1 ═ Kc1 when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | ≦ N; wherein N and Kc1 are constants; determining the refrigeration temperature compensation value Δ T1 ═ Kc1 ═ Tc (T)/Tc (T-1) | > N when the first circuit temperature satisfies | Tc (T) -Tc (T-1) | > N; the determining step of the heating temperature compensation value includes: when the second pipeline temperature meets | Th (T) -Th (T-1) | ≦ M, determining the heating temperature compensation value DeltaT 2 ═ Kc 2; wherein M and Kc2 are constants; when the second pipeline temperature meets | Th (T) -Th (T-1) | > M, determining the heating temperature compensation value Delta T2 ═ Kc2 | Tc (T)/Tc (T-1) |.
6. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein a compressor discharge line of the air conditioner is provided with a first high-pressure switch, a second high-pressure switch, and a check valve, the first high-pressure switch and the second high-pressure switch being located on an inlet side of the check valve, and the computer program is read and executed by the processor to implement the method according to any one of claims 1 to 4.
7. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-4.
CN202110909734.1A 2021-08-09 2021-08-09 Exhaust pressure adjusting method and device and air conditioner Active CN113719930B (en)

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Effective date of registration: 20221014

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Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd.