CN113587339A - Control method and device for rapidly balancing pressure difference of air conditioning system and air conditioner - Google Patents

Control method and device for rapidly balancing pressure difference of air conditioning system and air conditioner Download PDF

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Publication number
CN113587339A
CN113587339A CN202110729119.2A CN202110729119A CN113587339A CN 113587339 A CN113587339 A CN 113587339A CN 202110729119 A CN202110729119 A CN 202110729119A CN 113587339 A CN113587339 A CN 113587339A
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Prior art keywords
pressure difference
closing
fan
rotating speed
delay
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Inventor
刘永超
刘合心
宋磊
张稳
程相欣
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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Priority to CN202110729119.2A priority Critical patent/CN113587339A/en
Publication of CN113587339A publication Critical patent/CN113587339A/en
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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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • 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)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method and a control device for rapidly balancing the pressure difference of an air conditioning system and an air conditioner, wherein the method comprises the following steps: acquiring the pressure difference between high pressure and low pressure after the compressor is stopped; controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled; the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve, the reversing time of the four-way valve and the pressure difference are positively correlated. The invention controls the rotation speed of the delayed closing of the inner fan, the rotation speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner expansion valve and the reversing time of the four-way valve by coupling the high-low pressure difference and the low-high pressure difference, can quickly balance the high-low pressure difference after the compressor is shut down, and avoids the starting failure of the compressor.

Description

Control method and device for rapidly balancing pressure difference of air conditioning system and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for quickly balancing differential pressure of an air conditioner system and an air conditioner.
Background
With the improvement of living standard, air conditioners become essential household appliances of thousands of households, especially multi-split air conditioning systems, and are more and more popular due to high reliability and small required installation space.
At present, multi-split air conditioning systems generally have air bypass structures, but with the technology becoming more and more mature, the elimination of the air bypass structures can be realized through some control means. However, the air bypass structure is cancelled, so that the high-low pressure difference is slowly balanced after the compressor is shut down, and the compressor is failed to start if the high-low pressure difference is larger than a threshold value during restarting.
Disclosure of Invention
The invention solves the problem that the compressor fails to start when restarting due to slow balance of high-low pressure difference in the existing control scheme.
In order to solve the above problems, the present invention provides a control method for rapidly balancing a differential pressure of an air conditioning system, the method comprising: acquiring the pressure difference between high pressure and low pressure after the compressor is stopped; controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled; the rotating speed of the inner fan for delayed closing, the rotating speed of the outer fan for delayed closing, the opening degree of the inner engine expansion valve for delayed closing, and the reversing time of the four-way valve are positively correlated with the pressure difference.
The invention controls the rotation speed of the delayed closing of the inner fan, the rotation speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner expansion valve and the reversing time of the four-way valve by coupling the high-low pressure difference and the low-high pressure difference, can quickly balance the high-low pressure difference after the compressor is shut down, and avoids the starting failure of the compressor.
Optionally, the method further comprises: controlling at least one of: the delay closing time of the inner fan, the delay closing time of the outer fan and the delay closing time of the inner machine expansion valve; the inner fan delay closing time length is inversely related to the rotating speed of the inner fan delay closing, and/or the outer fan delay closing time length is inversely related to the rotating speed of the outer fan delay closing, and/or the inner fan expansion valve delay closing time length is positively related to the pressure difference.
The invention can control the time length of the delayed closing according to the pressure difference, thereby not only meeting the requirement of pressure difference balance, but also stopping in time after the balance, and reducing the noise and the power consumption.
Optionally, the inner blower expansion valve delayed closing time is longer than the outer blower delayed closing time, and/or the outer blower delayed closing time is longer than or equal to the inner blower delayed closing time.
The time length setting mode provided by the invention not only meets the aim of coupling and controlling the internal and external fans and the internal expansion valve to achieve the balance pressure difference, but also avoids influencing the use experience of a user as much as possible, and reduces the confusion or complaint of the user on delayed closing and the like.
Optionally, the values of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan in the low gear range are 50-80 seconds; the values of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan in the middle gear range are 30-50 seconds; the value ranges of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan which are in a high gear range are 10-30 seconds.
The invention provides the value range of the time length parameter of the delayed closing, and can effectively improve the pressure difference balance speed.
Optionally, if the pressure difference is smaller than a first pressure difference threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 80-120 steps; if the differential pressure is greater than or equal to the first differential pressure threshold and less than or equal to the second differential pressure threshold, the value range of the opening degree of the delay closing of the internal expansion valve is 140 steps; and if the pressure difference is greater than the second pressure difference threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 120-160 steps.
The invention provides the value range of the opening parameter of the delay closing of the expansion valve of the internal machine, and can effectively improve the pressure difference balance speed.
Optionally, if the air conditioner operates in a heating mode, the controlling a reversing duration of the four-way valve according to the pressure difference includes: if the pressure difference is smaller than a first pressure difference threshold value, controlling the four-way valve not to change direction; if the pressure difference is greater than or equal to the first pressure difference threshold value and less than or equal to a second pressure difference threshold value, controlling the four-way valve to reverse and continue for a first time period; if the pressure difference is greater than the second pressure difference threshold value, controlling the four-way valve to reverse and continue for a second time length; the second duration is greater than the first duration.
According to the invention, the reversing duration of the four-way valve is finely controlled according to the high-low pressure difference, so that the pressure difference can be rapidly balanced.
Optionally, the value range of the first duration is 1 to 5 seconds; the value range of the second time length is 4-6 seconds.
The invention provides the value range of the four-way valve reversing time length parameter, and the differential pressure balance speed can be effectively improved.
The invention provides a control device for rapidly balancing the pressure difference of an air conditioning system, which comprises: the pressure difference acquisition module is used for acquiring the pressure difference between high pressure and low pressure after the compressor is stopped; a delay control module for controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled; the rotating speed of the inner fan for delayed closing, the rotating speed of the outer fan for delayed closing, the opening degree of the inner engine expansion valve for delayed closing, and the reversing time of the four-way valve are positively correlated with the pressure difference.
The invention provides an air conditioner, which comprises a controller, wherein the controller is used for executing the method.
The present invention provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described method.
The control device for rapidly balancing the differential pressure of the air conditioning system, the air conditioner and the computer readable storage medium can achieve the same technical effect as the control method for rapidly balancing the differential pressure of the air conditioning system.
Drawings
FIG. 1 is a schematic diagram of an air conditioning system according to the present invention;
FIG. 2 is a schematic flow chart of a control method for rapidly balancing the differential pressure of an air conditioning system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of the start timing sequence of the internal and external fans, the internal expansion valve, and the four-way valve according to one embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device for rapidly balancing a differential pressure of an air conditioning system according to an embodiment of the present invention.
Description of reference numerals:
401-differential pressure acquisition module; 402-delay 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 the air conditioning system in this embodiment, showing that a compressor 11 is connected to an oil separator 12 and a gas-liquid separator 13, respectively, an air return sensor 14 and a low pressure sensor 15 are further disposed between the compressor 11 and the gas-liquid separator 13, an exhaust sensor 16 is further disposed between the compressor 11 and the oil separator 12, both the oil separator 12 and the gas-liquid separator 13 are connected to a four-way valve 17, and also showing a high pressure sensor 18, an outdoor heat exchanger 19 and a supercooling sensor 20, the outdoor heat exchanger 19 is connected to an electronic expansion valve EXV, and both upper and lower pipelines are connected to an indoor heat exchanger (not shown).
Fig. 1 also shows an air bypass structure with a dotted line, specifically including an electromagnetic valve 21, an oil return capillary tube 22, and an oil return sensor 23, where the air-conditioning system provided in this embodiment eliminates the air bypass structure.
Aiming at the problem that the high-low pressure difference balance of the air conditioning system is slow after the air conditioning system is shut down, the pressure difference balance is accelerated by means of measures such as delayed closing of the rotating speeds of the internal and external fans, delayed closing of the expansion valve of the internal fan, short-time reversing of the four-way valve and the like, and the starting failure of the compressor caused by overlarge pressure difference when the air conditioning system is restarted is avoided.
Specifically, a system high-pressure Pd and a system low-pressure Ps are set, and a system differential pressure Δ P is Pd — Ps. And after the system is shut down, detecting the pressure difference delta P of the system, and controlling the rotating speed of the internal and external fans, the step of the expansion valve of the internal fan, the four-way valve and other load actions according to the delta P.
FIG. 2 is a schematic flow chart of a control method for rapidly balancing the pressure difference of an air conditioning system according to an embodiment of the present invention, in which each of the voice air conditioners respectively includes a wireless communication module and a voice recognition module, and the voice air conditioners are connected to each other through the wireless communication module; the method is applied to a first voice air conditioner which is connected with a user terminal through a wireless communication module. The method comprises the following steps:
and S202, acquiring the pressure difference between the high pressure and the low pressure after the compressor is stopped.
S204, controlling at least one of the following items according to the pressure difference: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve.
The rotating speed of delayed closing of the inner fan, the rotating speed of delayed closing of the outer fan, the opening degree of delayed closing of the inner fan expansion valve, the reversing time of the four-way valve are positively correlated, and the larger the pressure difference is, the higher the rotating speed of delayed closing of the inner fan is, the higher the rotating speed of delayed closing of the outer fan is, the larger the opening degree of delayed closing of the inner fan expansion valve is, and the longer the reversing time of the four-way valve is.
The inner fan and the outer fan are closed in a delayed mode, heat exchange of the heat exchanger can be increased, high pressure is reduced, low pressure is increased, and high-low pressure difference balance is faster when the rotating speed is higher; the expansion valve of the inner machine is closed in a delayed mode, the function of gas bypass can be achieved, and the higher the opening degree of the expansion valve is, the faster the high-low pressure differential pressure balance is; in the heating mode, the high-pressure condensing side is directly communicated with the air suction pipe of the compressor after the four-way valve is switched to the direction, the low-pressure evaporating side is directly communicated with the exhaust pipe of the compressor, the high pressure can be quickly reduced, the low pressure can be quickly increased, and the longer the time is, the faster the pressure difference between the high pressure and the low pressure is balanced.
According to the control method for rapidly balancing the pressure difference of the air conditioning system, the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening degree of the delayed closing of the inner expansion valve and the reversing time of the four-way valve are coupled and controlled according to the magnitude of the high-low pressure difference, the high-low pressure difference after the compressor is shut down can be rapidly balanced, and the starting failure of the compressor is avoided.
Optionally, the speed of the inner fan delayed to be closed and/or the speed of the outer fan delayed to be closed according to the pressure difference can be controlled by the following conditions: (1) if the pressure difference is smaller than the first pressure difference threshold value, controlling the rotating speed of the delayed closing of the inner fan and/or the rotating speed of the delayed closing of the outer fan to be a low gear; (2) if the pressure difference is greater than or equal to the first pressure difference threshold and less than or equal to the second pressure difference threshold, controlling the rotating speed of the delayed closing of the inner fan and/or the rotating speed of the delayed closing of the outer fan to be a medium gear; (3) and if the pressure difference is greater than the second pressure difference threshold value, controlling the rotating speed of the delayed closing of the inner fan and/or the rotating speed of the delayed closing of the outer fan to be a high-speed gear.
Alternatively, the opening degree of the delayed closing of the internal expansion valve is controlled according to the differential pressure, and the following conditions may be included: (1) if the differential pressure is smaller than a first differential pressure threshold value, controlling the opening of the delay closing of the internal expansion valve to be a first opening; (2) if the differential pressure is greater than or equal to the first differential pressure threshold value and less than or equal to the second differential pressure threshold value, controlling the opening degree of the delay closing of the internal machine expansion valve to be a second opening degree; (3) if the differential pressure is greater than the second differential pressure threshold value, controlling the opening degree of the delay closing of the expansion valve of the internal machine to be a third opening degree; the third opening degree is larger than the second opening degree, and the second opening degree is larger than the first opening degree.
Alternatively, if the air conditioner operates in the heating mode, the reversing time of the four-way valve is controlled according to the pressure difference, which may include the following cases: (1) if the pressure difference is smaller than the first pressure difference threshold value, controlling the four-way valve not to change direction; (2) if the pressure difference is greater than or equal to a first pressure difference threshold value and less than or equal to a second pressure difference threshold value, controlling the four-way valve to reverse and continue for a first time period; (3) if the pressure difference is greater than a second pressure difference threshold value, controlling the four-way valve to reverse and continue for a second time length; the second duration is greater than the first duration. Wherein the value range of the first time length is 1-5 seconds; the second duration ranges from 4 to 6 seconds.
According to the embodiment, the rotating speed of the delayed closing of the internal fan, the rotating speed of the delayed closing of the outdoor fan, the opening of the delayed closing of the indoor electronic expansion valve and the reversing time of the four-way valve can be finely controlled according to the high-low pressure difference, so that the rapid pressure difference balance is realized.
Considering the influence of the time length of delayed closing of the inner fan, the outer fan and the inner machine expansion valve on the pressure difference balance, the time length of delayed closing can be controlled according to the pressure difference, so that the requirement of the pressure difference balance is met, the time can be stopped after the balance is carried out, and the noise and the power consumption are reduced. Based on this, the above method may further include: controlling at least one of: the delay closing time of the inner fan, the delay closing time of the outer fan and the delay closing time of the inner expansion valve.
The pressure can be reduced in a short time as the rotating speed of the fan is higher and the heat exchange effect is better, the delay closing time of the inner fan is negatively related to the rotating speed of the delay closing of the inner fan, and the delay closing time of the outer fan is negatively related to the rotating speed of the delay closing of the outer fan; because the opening degree and the delayed closing time of the inner expansion valve can improve the pressure difference balancing speed, the delayed closing time of the inner expansion valve can be positively correlated with the pressure difference. Optionally, the value ranges of the parameters are as follows:
(1) the value range of the delay closing time of the inner fan corresponding to the low gear and the delay closing time of the inner fan is 50-80 seconds; the value range of the delay closing time of the inner fan and the delay closing time of the inner fan corresponding to the middle gear is 30-50 seconds; the value range of the delay closing time of the inner fan and the delay closing time of the inner fan corresponding to the high-speed gear is 10-30 seconds.
(2) If the differential pressure is smaller than the first differential pressure threshold value, the value range of the opening degree of the delay closing of the internal machine expansion valve is 80-120 steps; if the differential pressure is greater than or equal to the first differential pressure threshold value and less than or equal to the second differential pressure threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 140 steps; if the pressure difference is larger than the second pressure difference threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 120-160 steps.
Optionally, the delay closing time of the inner fan expansion valve is longer than the delay closing time of the outer fan, and/or the delay closing time of the outer fan is longer than or equal to the delay closing time of the inner fan. In the time interval that the internal expansion valve is closed in a delaying mode, the refrigerant can normally flow to the low-pressure side from the high-pressure side, namely, the refrigerant is in a gas bypass mode, the user does not obviously perceive whether the refrigerant is closed, and relatively speaking, the user perceives whether the internal fan is closed or not as much as the external fan is closed or not, so that the time length setting mode not only meets the aim of achieving the balance pressure difference by coupling control of the internal fan, the external fan and the internal expansion valve, but also can avoid influencing the user experience as much as possible, and the confusion or complaint of the user on the delayed closing can be reduced.
The following describes in detail a specific embodiment of coupling control by delaying the closing of the rotation speed of the internal and external fans, delaying the closing of the expansion valve of the internal fan and short-time reversing of the four-way valve.
(1) Inner fan rotating speed Spn
According to the high-low pressure difference delta P of the system, the rotating speed and the delay t of the inner fan are adjusted1Second closing, increasing heat exchange of heat exchanger to reduce high pressure (heating mode: increasing)Condensation effect on the condensation side), low pressure rise (cooling mode: increasing the evaporation effect on the evaporation side), and quickly reducing the system pressure difference delta P.
When DeltaP < DeltaP0When the rotating speed Spn of the internal fan is the lowest gear, t is operated11Second (t)11The value of t is 60 and is not more than 5011≤80)；
When Δ P0≤△P≤△P1When the rotating speed Spn of the inner fan runs according to the middle gear t12Second later (t)12The value of t is more than or equal to 40 and less than or equal to 3012Less than or equal to 50), checking the pressure difference again, and judging again;
when DeltaP > [ Delta ] P1When the rotating speed Spn of the inner fan is in high-grade operation t13Second later (t)13The value of t is more than or equal to 20 and 1013Less than or equal to 30), checking the pressure difference again, and judging again.
Delta P is an actual measurement value of the differential pressure between high and low pressures0Is the lower limit value of the pressure difference, Δ P1The lower limit value of the pressure difference can finely control the rotating speed of the fan by dividing the range. The higher the rotating speed is, the better the heat exchange effect is, the pressure can be reduced in a shorter time, therefore, t is more than 1013≤t12≤t11。
(2) Outer fan rotating speed Spw
According to the high-low pressure difference delta P of the system, the rotating speed and the delay t of the external fan are adjusted2And closing the heat exchanger in seconds, increasing the heat exchange of the heat exchanger, reducing the high pressure (in a refrigeration mode: increasing the condensation effect on a condensation side), increasing the low pressure (in a heating mode: increasing the evaporation effect on an evaporation side), and rapidly reducing the pressure difference delta P of the system.
When DeltaP < DeltaP0When the rotating speed Spw of the external fan is the lowest gear, t is operated21Second (t)21The value of t is 60 and is not more than 5021≤80)；
When Δ P0≤△P≤△P1When the external fan rotates at the speed Spw according to the middle gear t22Second later (t)22The value of t is more than or equal to 40 and less than or equal to 3022Less than or equal to 50), checking the pressure difference again, and judging again;
when DeltaP > [ Delta ] P1When the rotating speed Spw of the external fan is operated at a high level t23Second later (t)23The value of t is more than or equal to 20 and 1023Less than or equal to 30)), and then checking the pressure differenceAnd judging again.
(3) Opening degree P of inner expansion valve
After the compressor is stopped, maintaining P according to the high-low pressure difference delta P of the system1And step t4 seconds, the valve step in the machine is closed.
When DeltaP < DeltaP0While maintaining P11Step (P)11The value of P is more than or equal to 100 and 8011Less than or equal to 120), delay t4＝t41(t41The value is 60 seconds, t is more than or equal to 4041≤80)，
When Δ P0≤△P≤△P1While maintaining P12Step (P)12Selecting P of 120, 100 ≤12Less than or equal to 140), delay t4＝t42(t42The value is 90 seconds, t is more than or equal to 6042≤120)，
When DeltaP > [ Delta ] P1While maintaining P13Step (P)13Selecting 140, 120 ≤ P13Less than or equal to 160), delay t4＝t43(t43Taking the value of t not less than 90 for 120 seconds43≤150)，
The opening of the inner machine valve is closed in a delayed mode, so that the function of gas bypass can be achieved, and the high-pressure and low-pressure difference can be balanced quickly. Valve step opening degree P1The larger the delay time t4The longer the pressure difference is, the faster the pressure difference is balanced, so P11≤P12≤P13，t41≤t42≤t43. When the valve of the internal machine is closed normally, the refrigerant can not flow, which is equivalent to the disconnection of the system; in the time of delaying closing, the refrigerant can normally flow from the high-pressure side to the low-pressure side, which is equivalent to an air bypass.
(4) Four-way valve SV4 reversing (refrigeration mode not related)
And for the heating mode, after the compressor is stopped, judging whether the four-way valve needs to be reversed to balance the pressure difference according to the high-low pressure difference delta P of the system.
When DeltaP < DeltaP0When in use, the four-way valve does not need to be reversed;
when Δ P0≤△P≤△P1Time, four-way valve reversing t51Second (t)51The value is 3 seconds, t is more than or equal to 151≤5)
When DeltaP > [ Delta ] P1When the four-way valve is changedTo t52Second (t)52The value is 5 seconds, t is not less than 452≤6)
After the four-way valve is switched, the high-pressure condensation side is directly communicated with the air suction pipe of the compressor, the low-pressure evaporation side is directly communicated with the exhaust pipe of the compressor, the high pressure can be quickly reduced, the low pressure can be quickly increased, and the balance between the high pressure and the low pressure is equivalent to the balance between the high pressure and the low pressure. For the heating mode, the pressure difference is larger, the reversing time of the four-way valve is longer, and the pressure difference can be quickly balanced; but not too long, which would otherwise cause compressor drainback.
FIG. 3 is a schematic diagram showing the start-up sequence of the internal and external fans, the internal expansion valve and the four-way valve, after the compressor is shut down, the external fan continues to operate t2Stopping the machine after second, and continuously operating the internal fan t1Stopping the machine after second, and continuously keeping the expansion valve of the internal machine open t4After second, the four-way valve is closed and the four-way valve is reversed t5And the conduction direction is restored after the second.
In the embodiment, after the compressor is stopped, the high-low pressure difference is quickly balanced by delaying the closing of the inner fan and the outer fan and the inner valve, controlling the rotating speed of the inner fan and the outer fan, reversing the four-way valve (aiming at heating) and other control means, so that the starting failure of the compressor is avoided.
Fig. 4 is a schematic structural diagram of a control device for rapidly balancing a differential pressure of an air conditioning system according to an embodiment of the present invention, the device including:
the pressure difference acquisition module 401 is configured to acquire a pressure difference between a high pressure and a low pressure after the compressor is stopped;
a delay control module 402 for controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled;
the rotating speed of the inner fan for delayed closing, the rotating speed of the outer fan for delayed closing, the opening degree of the inner engine expansion valve for delayed closing, and the reversing time of the four-way valve are positively correlated with the pressure difference.
The control device for rapidly balancing the pressure difference of the air conditioning system provided by the embodiment can rapidly balance the pressure difference of high pressure and low pressure after the compressor is shut down and avoid the starting failure of the compressor by coupling and controlling the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening degree of the delayed closing of the inner expansion valve and the reversing time of the four-way valve according to the pressure difference of high pressure and low pressure.
Optionally, as an embodiment, the delay control module 402 is further configured to: controlling at least one of: the delay closing time of the inner fan, the delay closing time of the outer fan and the delay closing time of the inner machine expansion valve; the inner fan delay closing time length is inversely related to the rotating speed of the inner fan delay closing, and/or the outer fan delay closing time length is inversely related to the rotating speed of the outer fan delay closing, and/or the inner fan expansion valve delay closing time length is positively related to the pressure difference.
Optionally, as an embodiment, the inner blower expansion valve delayed closing time is longer than the outer blower delayed closing time, and/or the outer blower delayed closing time is longer than or equal to the inner blower delayed closing time.
Optionally, as an embodiment, the value ranges of the delayed closing time duration of the inner fan and the delayed closing time duration of the inner fan, which correspond to the case where the rotation speed of the delayed closing of the inner fan and the rotation speed of the delayed closing of the outer fan are in the low gear, are 50 to 80 seconds; the values of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan in the middle gear range are 30-50 seconds; the value ranges of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan which are in a high gear range are 10-30 seconds.
Optionally, as an embodiment, if the differential pressure is smaller than a first differential pressure threshold, the value range of the opening degree of the internal expansion valve in delayed closing is 80-120 steps; if the differential pressure is greater than or equal to the first differential pressure threshold and less than or equal to the second differential pressure threshold, the value range of the opening degree of the delay closing of the internal expansion valve is 140 steps; and if the pressure difference is greater than the second pressure difference threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 120-160 steps.
Optionally, as an embodiment, the delay control module 402 is specifically configured to: if the pressure difference is smaller than a first pressure difference threshold value, controlling the four-way valve not to change direction; if the pressure difference is greater than or equal to the first pressure difference threshold value and less than or equal to a second pressure difference threshold value, controlling the four-way valve to reverse and continue for a first time period; if the pressure difference is greater than the second pressure difference threshold value, controlling the four-way valve to reverse and continue for a second time length; the second duration is greater than the first duration.
Optionally, as an embodiment, a value range of the first duration is 1 to 5 seconds; the value range of the second time length is 4-6 seconds.
The embodiment of the invention provides an air conditioner, which comprises a controller, wherein the controller is used for executing the method provided by the embodiment.
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 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 control device for rapidly balancing the differential pressure of the air conditioning system and the air conditioner disclosed in the embodiment correspond to the control method for rapidly balancing the differential pressure of the air conditioning system disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
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 (10)

1. A control method for rapidly balancing a differential pressure of an air conditioning system, the method comprising: acquiring the pressure difference between high pressure and low pressure after the compressor is stopped;
controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled;
the rotating speed of the inner fan for delayed closing, the rotating speed of the outer fan for delayed closing, the opening degree of the inner engine expansion valve for delayed closing, and the reversing time of the four-way valve are positively correlated with the pressure difference.
2. The method of claim 1, wherein the method further comprises: controlling at least one of: the delay closing time of the inner fan, the delay closing time of the outer fan and the delay closing time of the inner machine expansion valve;
the inner fan delay closing time length is inversely related to the rotating speed of the inner fan delay closing, and/or the outer fan delay closing time length is inversely related to the rotating speed of the outer fan delay closing, and/or the inner fan expansion valve delay closing time length is positively related to the pressure difference.
3. The method of claim 2, wherein the inner blower expansion valve delay off duration is greater than the outer blower delay off duration, and/or wherein the outer blower delay off duration is greater than or equal to the inner blower delay off duration.
4. The method according to claim 2, wherein the values of the delayed closing time length of the inner fan and the delayed closing time length of the inner fan corresponding to the delayed closing rotating speed of the inner fan and the delayed closing rotating speed of the outer fan in a low gear range are 50-80 seconds;
the values of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan in the middle gear range are 30-50 seconds;
the value ranges of the delay closing time length of the inner fan and the delay closing time length of the inner fan corresponding to the delay closing rotating speed of the inner fan and the delay closing rotating speed of the outer fan which are in a high gear range are 10-30 seconds.
5. The method according to claim 1, wherein if the differential pressure is less than a first differential pressure threshold, the opening degree of the internal expansion valve in delayed closing ranges from 80 to 120 steps;
if the differential pressure is greater than or equal to the first differential pressure threshold and less than or equal to the second differential pressure threshold, the value range of the opening degree of the delay closing of the internal expansion valve is 140 steps;
and if the pressure difference is greater than the second pressure difference threshold value, the value range of the opening degree of the delay closing of the internal expansion valve is 120-160 steps.
6. The method of claim 1, wherein said controlling a four-way valve commutation period based on said pressure differential if the air conditioner is operating in a heating mode comprises:
if the pressure difference is smaller than a first pressure difference threshold value, controlling the four-way valve not to change direction;
if the pressure difference is greater than or equal to the first pressure difference threshold value and less than or equal to a second pressure difference threshold value, controlling the four-way valve to reverse and continue for a first time period;
if the pressure difference is greater than the second pressure difference threshold value, controlling the four-way valve to reverse and continue for a second time length;
the second duration is greater than the first duration.
7. The method of claim 6, wherein the first duration ranges from 1 to 5 seconds; the value range of the second time length is 4-6 seconds.
8. A control device for rapidly equalizing a differential pressure in an air conditioning system, said device comprising: the pressure difference acquisition module is used for acquiring the pressure difference between high pressure and low pressure after the compressor is stopped; a delay control module for controlling at least one of: the rotating speed of the delayed closing of the inner fan, the rotating speed of the delayed closing of the outer fan, the opening of the delayed closing of the inner machine expansion valve and the reversing time of the four-way valve are controlled;
the rotating speed of the inner fan for delayed closing, the rotating speed of the outer fan for delayed closing, the opening degree of the inner engine expansion valve for delayed closing, and the reversing time of the four-way valve are positively correlated with the pressure difference.
9. An air conditioner comprising a controller configured to perform the method of any one of claims 1-7.
10. 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 1-7.
CN202110729119.2A 2021-06-29 2021-06-29 Control method and device for rapidly balancing pressure difference of air conditioning system and air conditioner Withdrawn CN113587339A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435471A (en) * 2022-09-16 2022-12-06 宁波奥克斯电气股份有限公司 Multi-split air conditioner control method and system and air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115435471A (en) * 2022-09-16 2022-12-06 宁波奥克斯电气股份有限公司 Multi-split air conditioner control method and system and air conditioner

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Application publication date: 20211102