CN113587336B - Air conditioner low-temperature refrigeration continuous operation control method and device and air conditioner - Google Patents

Air conditioner low-temperature refrigeration continuous operation control method and device and air conditioner Download PDF

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Publication number
CN113587336B
CN113587336B CN202110712476.8A CN202110712476A CN113587336B CN 113587336 B CN113587336 B CN 113587336B CN 202110712476 A CN202110712476 A CN 202110712476A CN 113587336 B CN113587336 B CN 113587336B
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pressure
fan
heat exchange
running gear
controlling
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CN113587336A (en
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刘永超
张稳
刘合心
陈体宁
杜文超
郭玮
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric 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
    • 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
    • F24F11/50—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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F24F11/87—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
    • 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
    • F24F2140/40—Damper positions, e.g. open or closed
    • 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)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a method and a device for controlling low-temperature refrigeration continuous operation of an air conditioner and the air conditioner, wherein the method comprises the following steps: under the condition of low-temperature refrigeration, acquiring a current running gear of a fan; if the current operating gear is smaller than a preset gear threshold value and lasts for a first time, closing at least one electromagnetic valve of the heat exchange module; and controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module or not according to the high-pressure. The electromagnetic valve and the gear of the outdoor fan can be controlled in a linkage manner under the condition of low-temperature refrigeration, so that the purpose of continuous and stable operation of the outdoor fan is achieved, the fluctuation of the air outlet temperature and the change degree of noise are reduced, and the comfortable experience of a user is improved.

Description

Air conditioner low-temperature refrigeration continuous operation control method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling low-temperature refrigeration continuous operation of an air conditioner and the air conditioner.
Background
At present, when an air conditioner refrigerates at low ambient temperature, because the load demand is small, the heat exchanger of an outdoor unit is large, when the frequency of a compressor and the wind gear of an outdoor fan are adjusted to be minimum, the load demand is still exceeded, the outdoor fan can only be stopped to meet the load demand, but no heat exchange exists after the outdoor fan is stopped, the load demand cannot be met as time goes on, the outdoor fan must be started to meet the load demand, and the periodic fan starting and stopping operation is formed.
The fan is periodically started and stopped, so that the air outlet temperature of the air conditioner fluctuates, the noise changes obviously, and the comfortable experience of a user is influenced.
Disclosure of Invention
The invention solves the problems of air-out temperature fluctuation and obvious noise change of the air conditioner caused by the periodic starting and stopping of the outdoor fan of the existing air conditioner.
In order to solve the problems, the invention provides a method for controlling the continuous operation of low-temperature refrigeration of an air conditioner, wherein an outdoor unit heat exchanger of the air conditioner comprises a plurality of heat exchange modules, and each heat exchange module is provided with an electromagnetic valve for controlling the on-off of a flow path; the method comprises the following steps: under the condition of low-temperature refrigeration, acquiring a current running gear of a fan; if the current operating gear is smaller than a preset gear threshold value and lasts for a first time, closing at least one electromagnetic valve of the heat exchange module; and controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module or not according to the high-pressure.
According to the invention, the outdoor heat exchanger is provided with a plurality of electromagnetic valves for block control, so that the multi-module independence and block heat exchange of the heat exchanger are realized, the electromagnetic valves and the gears of the outdoor fan can be controlled in a linkage manner under the condition of low-temperature refrigeration, and the purpose of continuous and stable operation of the outdoor fan is achieved, thereby reducing the fluctuation of the outlet air temperature and the variation degree of noise and improving the comfortable experience of users.
Optionally, if the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, controlling the operating gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure includes: if the high-pressure is greater than a first pressure threshold value, controlling the running gear of the fan to run at the average value of the current running gear and the maximum running gear; if the high-pressure is greater than a second pressure threshold and less than or equal to the first pressure threshold, controlling the running gear of the fan to run at a high pressure with a first high pressure as a target; the first high pressure is an average of the first pressure threshold and the second pressure threshold; and if the high-pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valves of the heat exchange module.
The invention can realize linkage control of the electromagnetic valve and the gears of the outdoor fan, and achieves the purpose of continuous and stable operation of the outdoor fan.
Optionally, after increasing the number of closed solenoid valves of the heat exchange module, the method further comprises: after the fan runs for a second time, if the high-pressure is greater than the second pressure threshold, the running gear of the fan is controlled to run at a quarter of the sum of the current running gear and the maximum running gear; if the high-pressure is larger than a third pressure threshold and smaller than or equal to the second pressure threshold, controlling the running gear of the fan to run at a high pressure with a second high pressure as a target; the second high pressure is an average of the second pressure threshold and the third pressure threshold; and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
The invention can realize linkage control of the electromagnetic valve and the gears of the outdoor fan, and achieves the purpose of continuous and stable operation of the outdoor fan.
Optionally, if the outdoor environment temperature is lower than the second outer ring temperature, controlling the operation gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure includes: if the high-pressure is greater than a second pressure threshold value, controlling the running gear of the fan to run at one fourth of the sum of the current running gear and the maximum running gear; if the high-pressure is greater than a third pressure threshold and less than or equal to the second pressure threshold, controlling the running gear of the fan to run at a target high pressure with second high pressure; the second high pressure is an average of the second pressure threshold and the third pressure threshold; and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
The invention can realize linkage control of the electromagnetic valve and the gears of the outdoor fan, and achieves the purpose of continuous and stable operation of the outdoor fan.
Optionally, before the closing the solenoid valve of at least one of the heat exchange modules, the method further comprises: acquiring the operating frequency of a compressor; if the operating frequency is greater than the minimum operating frequency, controlling the compressor to perform frequency reduction operation; and if the operating frequency is equal to the minimum operating frequency, executing the step of closing at least one electromagnetic valve of the heat exchange module.
The invention can control the running frequency of the compressor, the electromagnetic valve and the gear of the outdoor fan in a linkage manner, thereby achieving the purpose of continuous and stable running of the outdoor fan.
Optionally, the method further comprises: acquiring the outdoor environment temperature; and if the outdoor environment temperature is less than or equal to the first outer ring temperature and the outdoor environment temperature is in the refrigeration mode, determining the low-temperature refrigeration condition.
The invention provides a determination mode of low-temperature refrigeration condition, which can accurately judge whether to execute each step of the continuous operation control method and improve the control efficiency of the outdoor unit.
Optionally, a value range of the first pressure threshold is greater than or equal to 24bar, or a value range of the second pressure threshold is 18-24bar, or a value range of the third pressure threshold is 15-17bar.
The invention provides the value range of each parameter, can provide a control basis and improves the continuous operation stability of the outdoor fan.
The invention provides a low-temperature refrigeration continuous operation control device of an air conditioner, wherein an outdoor unit heat exchanger of the air conditioner comprises a plurality of heat exchange modules, and each heat exchange module is provided with an electromagnetic valve for controlling the on-off of a flow path; the device comprises: the wind gear acquisition module is used for acquiring the current running gear of the fan under the condition of low-temperature refrigeration; the heat exchange control module is used for closing at least one electromagnetic valve of the heat exchange module if the current running gear is smaller than a preset gear threshold value and lasts for a first time; and the linkage control module is used for controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure.
The invention provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and run by the processor, the method for controlling the low-temperature refrigeration continuous operation of the air conditioner is realized.
The invention provides a computer readable storage medium, which stores a computer program, and when the computer program is read and operated by a processor, the method for controlling the low-temperature refrigeration continuous operation of the air conditioner is realized.
The air conditioner low-temperature refrigeration continuous operation control device, the air conditioner and the computer readable storage medium can achieve the same technical effect as the air conditioner low-temperature refrigeration continuous operation control method.
Drawings
Fig. 1 is a schematic structural view of an outdoor unit according to the present invention;
FIG. 2 is a schematic flow chart of a method for controlling the continuous operation of the low-temperature cooling of the air conditioner according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating another method for controlling the low-temperature cooling continuous operation of an air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a low-temperature cooling continuous operation control device of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
401-a windshield obtaining module; 402-a heat exchange control module; 403-coordinated control module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic structural diagram of an outdoor unit according to the present invention, and an outdoor unit heat exchanger HEx includes three heat exchange modules, and the flow rates of the heat exchange modules are respectively provided with solenoid valves GV1, GV2, and GV3. Also shown in fig. 1 are an external unit environmental bulb Tao, a compressor Comp, a four-way valve 4way, a return pipe, an exhaust pipe, and two fans Fan1, fan2.
The outdoor unit environment temperature sensing bag is used for detecting outdoor environment temperature Tao, the exhaust temperature sensor is used for detecting temperature Td, the return air temperature sensor is used for detecting temperature Ts, the high-pressure sensor is used for detecting high-pressure Pd, corresponds to high-pressure saturation temperature Tpd, and outdoor fan gear Fs. Under the normal operation state, the electromagnetic valve is in a full-open state, the maximum fan gear Fs-max, the minimum fan gear Fs-min and the fan gear adjustment coefficient alpha are within the range of 1/5 to 1/2, for example, alpha =1/3.
The parameters are periodically detected when the air conditioner runs, generally k seconds are 1 cycle, k is more than or equal to 20 and less than or equal to 40, for example, k takes 30 seconds, if the k is too long, the control reaction is not timely, abnormal protection occurs, if the k is too short, the control action is too frequent, and overshoot and poor stability are caused.
Because the heat exchange effect of the outdoor unit is determined by two devices: the heat exchange area of the condenser (the size of the condenser) and the rotating speed (air volume) of the outdoor fan. The heat exchange effect of the outdoor unit is related to high pressure: the better the heat exchange is, the more sufficient the heat exchange of the refrigerant in the condenser is, and the larger the amplitude reduction of the high-pressure pd is; the worse the heat exchange, the worse the heat exchange of the refrigerant in the condenser, the smaller the drop amplitude of the high-pressure pd is.
In the refrigeration mode, the running gear of the fan is automatically adjusted according to the high pressure Pd, and the method specifically comprises the following steps: when the Pd is more than or equal to 16bar (E) and less than or equal to 23bar (E), the wind speed is kept; when Pd is less than 16bar, the pressure of the fan is reduced to 0 after being maintained for 30 s; when pd > 28bar, the fan is raised to the highest gear. The on-off of the electromagnetic valve can control the area of the condenser participating in the heat exchange of the system. Therefore, this embodiment is through the break-make of the operation gear of coordinated control fan and solenoid valve to the heat transfer effect of adjustment off-premises station makes it match the load demand, reaches the purpose that outdoor fan lasts steady operation.
Fig. 2 is a schematic flow chart of a method for controlling continuous operation of low-temperature refrigeration of an air conditioner in an embodiment of the present invention, the method is applied to the air conditioner, an outdoor heat exchanger of the air conditioner includes a plurality of heat exchange modules, each heat exchange module is provided with a solenoid valve for controlling on/off of a flow path, and the method includes the following steps:
and S202, acquiring the current running gear of the fan under the condition of low-temperature refrigeration.
The air conditioner runs in a refrigeration mode, m internal machines are started, and the steps of the embodiment are executed after the compressor is started for 1 minute. Wherein, a1 is more than or equal to 10 and less than or equal to 20, for example, a1 is 15. The current operation gear of the fan is represented by a maximum fan gear Fs-max and a fan gear adjustment coefficient alpha and is alpha Fs-max.
Alternatively, by comparing the outdoor ambient temperature with a preset ambient temperature threshold, it can be determined whether or not the operation is being performed in the low temperature cooling condition. Firstly, acquiring outdoor environment temperature; and then, if the outdoor environment temperature is less than or equal to the first outer ring temperature and the outdoor environment temperature is operated in the refrigeration mode, determining the low-temperature refrigeration condition.
And under the non-low-temperature refrigeration condition, normally controlling the outdoor fan according to the target high pressure Pd.
And S204, if the current running gear is smaller than the preset gear threshold value and lasts for the first time, closing the electromagnetic valve of at least one heat exchange module.
The preset gear threshold value is a smaller gear value in the range of the operable gear of the fan, the wind gear is in a lower state when the wind gear is lower than the threshold value, the condition that the fan is completely shut down easily occurs by continuously reducing the gear, and the heat exchange effect of the outdoor unit can be reduced by reducing the heat exchange area. The purpose of continuous and stable operation of the outdoor fan is achieved through linkage control of the fan gears and the electromagnetic valve of the outdoor unit heat exchange module.
In order to improve the accuracy of judgment, a continuous time judgment condition is set, the current running gear detected within a certain time is smaller than the preset gear threshold, the gear of the outdoor fan is judged to be very small, the gear still exceeds the load requirement, and the heat exchange area can be reduced by closing the electromagnetic valve of the heat exchange module.
After the electromagnetic valve is closed, the corresponding heat exchange module stops the heat exchange action. If n heat exchange modules with equal heat exchange areas exist, under the condition that the air quantity is not changed, closing one electromagnetic valve is equivalent to reducing the heat exchange area of the 1/n condenser, and the more the electromagnetic valves are closed, the smaller the heat exchange quantity is. Taking the aforementioned 3 heat exchange modules as an example, one solenoid valve GV1 may be closed.
After closing at least one solenoid valve, system high pressure Pd can rise, and then can control the fan rotational speed and continue to operate at a reasonable stable within range to prevent that the fan from shutting down and influencing system's heat transfer effect, avoid the air conditioner to appear the problem that air-out temperature is undulant, noise variation is showing.
And S206, controlling the running gear of the fan and whether to close the electromagnetic valves of more heat exchange modules according to the high-pressure.
After the electromagnetic valve is closed, the high-pressure can rise, the operation gear of the fan can be further controlled in real time according to the high-pressure, and more heat exchange modules can be further closed as required.
In order to finely control the operating gear and the electromagnetic valve of the fan, under the condition that the outdoor environment temperature is less than or equal to the first outer ring temperature, the outdoor environment temperature can be further divided into two ranges according to the outdoor environment temperature, wherein the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, and the outdoor environment temperature is less than the second outer ring temperature, and different operating gear and electromagnetic valve control strategies are respectively executed in the two ranges.
Optionally, if the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, executing the operating gear and the electromagnetic valve control according to the following steps:
(1) And if the high-pressure is greater than the first pressure threshold value A, controlling the running gear of the fan to run at the average value of the current running gear alpha Fs-max and the maximum running gear Fs-max. When Pd is larger than A, the gear of the outer fan runs according to Fs = (Fs-max + alpha Fs-max)/2.
(2) And if the high-pressure is greater than the second pressure threshold B and less than or equal to the first pressure threshold A, controlling the running gear of the fan to run by taking the first high pressure as a target high pressure Pd. The first high pressure is an average of the first pressure threshold and the second pressure threshold. And when B is larger than Pd and is smaller than or equal to A, the gear of the outer fan is automatically controlled according to the target high pressure Pd = (A + B)/2.
(3) And if the high-pressure is less than or equal to the second pressure threshold value B, increasing the closing number of the electromagnetic valves of the heat exchange module. For example, when Pd ≦ B, one solenoid valve GV2 is closed. The load demand is still exceeded in the above-described case of only turning off GV1, requiring a further reduction in condenser heat exchange area.
After the number of the electromagnetic valves of the heat exchange modules is increased, the running gears of the fan can be continuously adjusted, and more electromagnetic valves of the heat exchange modules are controlled to be closed until all the electromagnetic valves are closed. Based on this, the following steps can be further included:
and after the fan runs for the second time, if the high-pressure is greater than a second pressure threshold value B, controlling the running gear of the fan to run by one fourth of the sum of the current running gear and the maximum running gear. When Pd is larger than B, the gear of the outer fan runs according to Fs = (Fs-max + alpha Fs-max)/4.
And if the high-pressure is greater than the third pressure threshold value C and less than or equal to the second pressure threshold value B, controlling the running gear of the fan to run at a high pressure with the second high pressure as a target. The second high pressure is an average of the second pressure threshold and the third pressure threshold. And when the C is less than or equal to Pd and less than or equal to B, automatically controlling the gear of the outer fan according to the target high pressure Pd = (B + C)/2.
And if the high-pressure is less than or equal to the third pressure threshold value C, closing the electromagnetic valves of all the heat exchange modules and controlling the electromagnetic valve of at least one heat exchange module to be periodically opened and closed. When Pd < C, the solenoid valve GV3 performs frequent opening and closing actions. The load requirement is still exceeded after the electromagnetic valves GV1 and GV2 are only closed, but the condenser cannot completely stop the circulation of the refrigerant, the GV3 can be periodically started and stopped to control the amount of the refrigerant, and the gear of the outdoor fan runs according to the lowest gear Fs-min.
Optionally, if the outdoor environment temperature is lower than the second outer ring temperature, executing the operation gear and the electromagnetic valve control according to the following steps:
(1) And if the high-pressure is greater than the second pressure threshold value, controlling the running gear of the fan to run at one fourth of the sum of the current running gear and the maximum running gear.
(2) If the high-pressure is greater than the third pressure threshold and less than or equal to the second pressure threshold, controlling the running gear of the fan to run at a target high pressure by taking the second high pressure as a target; the second high pressure is an average of the second pressure threshold and the third pressure threshold.
(3) And if the high-pressure is less than or equal to the third pressure threshold, closing the electromagnetic valves of all the heat exchange modules and controlling the electromagnetic valve of at least one heat exchange module to be periodically opened and closed.
The solenoid valve is periodically opened and closed (started and stopped) as follows: and starting timing from a power-off closed state, electrifying after k seconds to be in an ON communication state, and continuously operating for mk seconds and then calculating a start-stop period (m + 1) k. Wherein m is more than or equal to 2, for example, m is 3,3 ≦ k ≦ 7, for example, k is 5.
It should be noted that the determination process of the operating gear is optimally performed based on the system stability and the heat exchange of the external unit.
After the electromagnetic valve GV1 is closed, if Pd is larger than A, the electromagnetic valve GV1 is just closed at the moment, the high-pressure has a large sudden increase, the rotating speed of the fan needs to be increased, the air volume needs to be increased, the heat exchange effect is increased, and the high-pressure is reduced to a stable value. However, the operating gear of the fan is increased too much, and high pressure is liable to drop, which causes severe system fluctuation, so that the operating gear is selected to be a reasonable value (α Fs-max < Fs-max), for example, fs = (Fs-max + α Fs-max)/2, which can roughly adjust the system high pressure. If B is less than Pd and less than or equal to a, in order to ensure stable operation of the rotating speed of the external fan, the high pressure is in a proper range, a reasonable target high pressure value can be set for automatic adjustment, and the gear of the external fan can be finely adjusted according to the target high pressure value, for example, the target high pressure Pd = (a + B)/2 is selected.
After the solenoid valves GV1, GV2 are closed, the actual load demand is smaller than that in the case of closing the solenoid valve GV1, and there is still a problem that the load demand is exceeded after both the solenoid valves are closed, further lowering the operation range of the fan and further lowering the target high pressure. As mentioned above, if Pd > B, the operating gear is selected to be Fs = (Fs-max + alpha Fs-max)/4, and the system high pressure can be roughly adjusted. If C < Pd ≦ B, the target high pressure Pd = (A + B)/2 is selected.
Optionally, a value range of the first pressure threshold a is greater than or equal to 24bar, for example, a takes 26bar, a value range of the second pressure threshold B is 18-24bar, for example, B takes 22bar, and a value range of the third pressure threshold C is 15-17bar, for example, C takes 16bar.
The air conditioner low-temperature refrigeration continuous operation control method provided by the embodiment has the advantages that the outdoor unit heat exchanger is provided with a plurality of electromagnetic valves for controlling in a blocking mode, multiple modules of the heat exchanger are independent, blocking heat exchange is achieved, electromagnetic valves and outdoor fan gears can be controlled in a linkage mode under the low-temperature refrigeration condition, the purpose that the outdoor fan continuously and stably operates is achieved, accordingly fluctuation of air outlet temperature and noise variation degree are reduced, and comfortable experience of users is improved.
Considering that the operation frequency of the compressor is also an important factor affecting the heat exchange effect of the outdoor unit, before the electromagnetic valve of at least one heat exchange module is closed, whether the operation frequency is reduced to the minimum or not can be checked, and based on this, the method further comprises the following steps:
acquiring the operating frequency of a compressor; if the operating frequency is greater than the minimum operating frequency, controlling the compressor to perform frequency reduction operation; and if the operating frequency is equal to the minimum operating frequency, executing the step of closing the electromagnetic valve of at least one heat exchange module.
When the operating frequency has a reduction space, the operating frequency can be preferentially reduced, so that the heat exchange effect is reduced, and the power consumption is reduced.
Referring to fig. 2, a schematic flow chart of a method for controlling the continuous operation of the low-temperature refrigeration of the air conditioner includes the following steps:
s301, detecting the outer ring temperature Tao. If Tao > T1, executing S302; if T2 is more than Tao and less than or equal to T1, executing S303; if Tao is less than or equal to T2, then S308 is executed. Wherein, T1 is more than or equal to 20 and less than or equal to 30, for example, T1 is 25 ℃; t2 is 5. Ltoreq. T2. Ltoreq.15, for example T2 is 10 ℃.
And S302, normally controlling the outdoor fan according to the target high pressure Pd.
And S303, when the condition that the running gear Fs of the fan is larger than alpha Fs-max is detected for a2 minutes continuously, the system is controlled normally. Wherein 1 ≦ a1 ≦ 5, for example, a2 is 3,1/5 ≦ α ≦ 1/2, for example, α is 1/3.
S304, when the operating gear Fs of the fan is detected to be less than or equal to alpha Fs-max in a2 minutes, closing the electromagnetic valve GV1, and controlling the gear Fs of the outdoor fan in real time according to the high pressure Pd.
S305, when Pd is larger than A, the gear of the outer fan runs according to Fs = (Fs-max + alpha Fs-max)/2.
And S306, when the B is larger than Pd and smaller than or equal to A, automatically controlling the gear of the outer fan according to the target high pressure Pd = (A + B)/2.
S307, when Pd is less than or equal to B, the electromagnetic valve GV2 is closed. And, S309 is further performed.
And S308, when the condition that the fan operation gear Fs is larger than alpha Fs-max is detected for a2 minutes continuously, the system normally controls.
S309, when detecting that the operating gear Fs of the fan is less than or equal to alpha Fs-max in a2 minutes, closing the electromagnetic valves GV1 and GV2, and controlling the gear Fs of the outdoor fan in real time according to the high pressure Pd.
S310, when Pd is larger than B, the gear of the outer fan runs according to Fs = (Fs-max + alpha Fs-max)/4
S311, when the C is not less than Pd and not more than B, the gear of the outer fan is automatically controlled according to the target high pressure Pd = (B + C)/2.
S312, when Pd is less than C, the electromagnetic valve GV3 executes frequent switching action, and the gear of the outdoor fan runs according to the lowest gear Fs-min.
According to the method provided by the embodiment, the heat exchanger of the outdoor unit is controlled by the segmented electromagnetic valve, so that the heat exchanger is independent of multiple modules, and the heat exchange in a segmented mode according to scenes is realized; the purpose of continuous and stable operation of the outdoor fan is achieved by dividing the outdoor environment temperature and the high pressure and performing linkage control on the electromagnetic valve switch of the outdoor unit, the frequency of the outdoor unit and the gear of the outdoor fan.
Fig. 3 is a schematic structural diagram of a low-temperature refrigeration continuous operation control device of an air conditioner in an embodiment of the present invention, an outdoor unit heat exchanger of the air conditioner includes a plurality of heat exchange modules, and each of the heat exchange modules is provided with a solenoid valve for controlling the on/off of a flow path; the device comprises:
the wind gear obtaining module 401 is configured to obtain a current operating gear of the fan under a low-temperature refrigeration condition;
the heat exchange control module 402 is configured to close at least one electromagnetic valve of the heat exchange module if the current operating gear is smaller than a preset gear threshold and lasts for a first duration;
and the linkage control module 403 is configured to control an operation gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure.
The air conditioner low temperature refrigeration that this embodiment provided lasts operation controlling means, outdoor unit heat exchanger set up a plurality of solenoid valve blocking controls, and it is independent to realize heat exchanger multimode, and the blocking heat transfer can coordinated control solenoid valve, outdoor fan gear in the low temperature refrigeration condition, reaches the purpose that outdoor fan lasts steady operation to reduce the undulant and noise variation degree of air-out temperature, improve user's comfortable experience.
Optionally, as an embodiment, if the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the linkage control module 303 is specifically configured to:
if the high-pressure is greater than a first pressure threshold value, controlling the running gear of the fan to run at the average value of the current running gear and the maximum running gear; if the high-pressure is greater than a second pressure threshold and less than or equal to the first pressure threshold, controlling the running gear of the fan to run at a high pressure with a first high pressure as a target; the first high pressure is an average of the first pressure threshold and the second pressure threshold; and if the high-pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valves of the heat exchange module.
Optionally, as an embodiment, the linkage control module 303 is further configured to:
after the fan runs for a second time, if the high-pressure is greater than the second pressure threshold, the running gear of the fan is controlled to run at a quarter of the sum of the current running gear and the maximum running gear; if the high-pressure is larger than a third pressure threshold and smaller than or equal to the second pressure threshold, controlling the running gear of the fan to run at a high pressure with a second high pressure as a target; the second high pressure is an average of the second pressure threshold and the third pressure threshold; and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
Optionally, as an embodiment, if the outdoor environment temperature is lower than the second outer ring temperature, the linkage control module 303 is specifically configured to:
if the high-pressure is greater than a second pressure threshold value, controlling the running gear of the fan to run at one fourth of the sum of the current running gear and the maximum running gear; if the high-pressure is greater than a third pressure threshold and less than or equal to the second pressure threshold, controlling the running gear of the fan to run at a target high pressure with second high pressure; the second high pressure is an average of the second pressure threshold and the third pressure threshold; and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
Optionally, as an embodiment, the linkage control module 303 is further configured to:
acquiring the operating frequency of a compressor; if the operating frequency is greater than the minimum operating frequency, controlling the compressor to perform frequency reduction operation; and if the operating frequency is equal to the minimum operating frequency, executing the step of closing at least one electromagnetic valve of the heat exchange module.
Optionally, as an embodiment, the system further includes a low-temperature refrigeration judging module, configured to:
acquiring the outdoor environment temperature; and if the outdoor environment temperature is less than or equal to the first outer ring temperature and the outdoor environment temperature is in the refrigeration mode, determining the low-temperature refrigeration condition.
Optionally, as an embodiment, a value range of the first pressure threshold is greater than or equal to 24bar, or a value range of the second pressure threshold is 18 to 24bar, or a value range of the third pressure threshold is 15 to 17bar.
The embodiment of the invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the method for controlling the low-temperature refrigeration continuous operation of the air conditioner.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method provided in the foregoing embodiment is implemented, and the same technical effect can be achieved, 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 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 a … …" does not exclude the presence of another identical element 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 air conditioner low-temperature cooling continuous operation control device and the air conditioner disclosed by the embodiment correspond to the air conditioner low-temperature cooling continuous operation control method disclosed by the embodiment, so that the description is simple, and related points can be referred to the method part for description.
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 (8)

1. The method for controlling the continuous operation of the low-temperature refrigeration of the air conditioner is characterized in that an outdoor unit heat exchanger of the air conditioner comprises a plurality of heat exchange modules, and each heat exchange module is provided with an electromagnetic valve for controlling the on-off of a flow path; the method comprises the following steps:
under the condition of low-temperature refrigeration, acquiring a current operating gear of a fan;
if the current operating gear is smaller than a preset gear threshold value and lasts for a first time, closing at least one electromagnetic valve of the heat exchange module;
controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module or not according to the high-pressure;
if the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure comprises the following steps:
if the high-pressure is greater than a first pressure threshold value, controlling the running gear of the fan to run at the average value of the current running gear and the maximum running gear;
if the high-pressure is greater than a second pressure threshold and less than or equal to the first pressure threshold, controlling the running gear of the fan to run at a high pressure with a first high pressure as a target; the first high pressure is an average of the first pressure threshold and the second pressure threshold;
if the high-pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valves of the heat exchange module;
if the outdoor environment temperature is less than the second outer loop temperature, whether control according to high pressure the operation gear of fan and close more heat exchange module's solenoid valve includes:
if the high-pressure is greater than a second pressure threshold value, controlling the running gear of the fan to run at one fourth of the sum of the current running gear and the maximum running gear;
if the high-pressure is greater than a third pressure threshold and less than or equal to the second pressure threshold, controlling the running gear of the fan to run at a target high pressure with second high pressure; the second high pressure is an average of the second pressure threshold and the third pressure threshold;
and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
2. The method of claim 1, wherein after increasing the number of solenoid valves of the heat exchange module that are closed, the method further comprises:
after the fan runs for a second time, if the high-pressure is greater than the second pressure threshold, the running gear of the fan is controlled to run at a quarter of the sum of the current running gear and the maximum running gear;
if the high-pressure is larger than the third pressure threshold and smaller than or equal to the second pressure threshold, controlling the running gear of the fan to run at a high pressure with a second high pressure as a target; the second high pressure is an average of the second pressure threshold and the third pressure threshold;
and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
3. The method of claim 1, wherein prior to said closing at least one solenoid valve of said heat exchange module, said method further comprises:
acquiring the operating frequency of a compressor;
if the operating frequency is greater than the minimum operating frequency, controlling the compressor to perform frequency reduction operation;
and if the operating frequency is equal to the minimum operating frequency, executing the step of closing at least one electromagnetic valve of the heat exchange module.
4. The method of claim 1, wherein the method further comprises:
acquiring the outdoor environment temperature;
and if the outdoor environment temperature is less than or equal to the first outer ring temperature and the outdoor environment temperature is in the refrigeration mode, determining the low-temperature refrigeration condition.
5. The method of claim 1, wherein the first pressure threshold has a value in a range of 24bar or more, the second pressure threshold has a value in a range of 18-24bar, or the third pressure threshold has a value in a range of 15-17bar.
6. The low-temperature refrigeration continuous operation control device of the air conditioner is characterized in that an outdoor unit heat exchanger of the air conditioner comprises a plurality of heat exchange modules, and each heat exchange module is provided with an electromagnetic valve for controlling the on-off of a flow path; the device comprises:
the air gear acquisition module is used for acquiring the current operating gear of the fan under the condition of low-temperature refrigeration;
the heat exchange control module is used for closing at least one electromagnetic valve of the heat exchange module if the current running gear is smaller than a preset gear threshold value and lasts for a first time;
the linkage control module is used for controlling the running gear of the fan and whether to close more electromagnetic valves of the heat exchange module according to the high-pressure;
if the outdoor environment temperature is less than or equal to the first outer ring temperature and greater than the second outer ring temperature, the linkage control module is specifically configured to:
if the high-pressure is greater than a first pressure threshold value, controlling the running gear of the fan to run at the average value of the current running gear and the maximum running gear;
if the high-pressure is greater than a second pressure threshold and less than or equal to the first pressure threshold, controlling the running gear of the fan to run at a high pressure with a first high pressure as a target; the first high pressure is an average of the first pressure threshold and the second pressure threshold;
if the high-pressure is less than or equal to the second pressure threshold, increasing the closing number of the electromagnetic valves of the heat exchange module;
if the outdoor environment temperature is less than the second outer ring temperature, the linkage control module is specifically used for:
if the high-pressure is greater than a second pressure threshold value, controlling the running gear of the fan to run at one fourth of the sum of the current running gear and the maximum running gear;
if the high-pressure is greater than a third pressure threshold and less than or equal to the second pressure threshold, controlling the running gear of the fan to run at a target high pressure with second high pressure; the second high pressure is an average of the second pressure threshold and the third pressure threshold;
and if the high-pressure is less than or equal to the third pressure threshold, controlling the running gear of the fan to run at the lowest gear, closing all the electromagnetic valves of the heat exchange modules, and controlling at least one electromagnetic valve of the heat exchange module to be periodically opened and closed.
7. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method according to any one of claims 1 to 5.
8. 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 1-5.
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