CN113606739B - Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner - Google Patents

Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner Download PDF

Info

Publication number
CN113606739B
CN113606739B CN202110960696.2A CN202110960696A CN113606739B CN 113606739 B CN113606739 B CN 113606739B CN 202110960696 A CN202110960696 A CN 202110960696A CN 113606739 B CN113606739 B CN 113606739B
Authority
CN
China
Prior art keywords
air conditioner
pressure difference
split air
controlling
expansion valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110960696.2A
Other languages
Chinese (zh)
Other versions
CN113606739A (en
Inventor
李兆东
刘合心
陈华
郝明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Original Assignee
Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningbo Aux Electric Co Ltd, Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd filed Critical Ningbo Aux Electric Co Ltd
Priority to CN202110960696.2A priority Critical patent/CN113606739B/en
Publication of CN113606739A publication Critical patent/CN113606739A/en
Application granted granted Critical
Publication of CN113606739B publication Critical patent/CN113606739B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • 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

Landscapes

  • 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)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention provides a control method and device for air conditioner shutdown differential pressure balance and a multi-split air conditioner, and relates to the technical field of air conditioners. The control method comprises the following steps: responding to a stop command to control the compressor of the multi-split air conditioner to stop; acquiring the high-low pressure difference of the multi-split air conditioner; judging whether the high-low pressure difference is greater than a first preset pressure difference or not; and if the high-low pressure difference is larger than the first preset pressure difference, controlling the opening degree and the continuous opening pressure difference balance time of the outer expansion valve of the multi-split air conditioner, and/or controlling the opening degree and the continuous opening pressure difference balance time of the inner expansion valve of the multi-split air conditioner so as to balance the high-low pressure difference. The control method can realize the cancellation of the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, and can realize the simplification of a system, the reduction of cost and the improvement of the product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner.

Description

Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for shutdown differential pressure balance of an air conditioner and a multi-split air conditioner.
Background
In order to improve the reliability of the system, the multi-connected variable frequency air conditioning unit is generally provided with a bypass branch, and the bypass branch is provided with an air bypass and a liquid bypass according to the type difference. The bypass branch has the main function of rapidly balancing the pressure difference between the high pressure side and the low pressure side when the air conditioner is shut down, and the problem that the use and the reliability of the air conditioner are influenced due to the fact that starting failure is caused by overlarge pressure difference caused by overlarge back pressure when the compressor is started for the second time is avoided.
However, in the related art, since the bypass branch is provided, the complexity of the design of the air conditioning system and the design of the pipeline is increased, and the cost of the product is high, so that how to cancel the bypass branch by a control means realizes the simplification of the system, the reduction of the cost and the improvement of the product competitiveness on the premise of ensuring the reliability of the air conditioner is a problem worthy of research in the industry.
Disclosure of Invention
The invention solves the technical problems of system simplification and cost reduction by eliminating a bypass branch by a control means on the premise of ensuring the reliability of the air conditioner.
In order to solve the above problems, embodiments of the present invention provide a method and an apparatus for controlling a shutdown pressure difference balance of an air conditioner, and a multi-split air conditioner.
In a first aspect, the present invention provides a method for controlling a shutdown differential pressure balance of an air conditioner, which is applied to a multi-split air conditioner, and the method includes:
controlling the compressor of the multi-split air conditioner to stop in response to a stop command;
acquiring the high-low pressure difference of the multi-split air conditioner;
judging whether the high-low pressure difference is greater than a first preset pressure difference or not;
and if the high-low pressure difference is larger than the first preset pressure difference, controlling the opening degree of the outer expansion valve of the multi-split air-conditioning system and the continuous opening pressure difference balancing time, and/or controlling the opening degree of the inner expansion valve of the multi-split air-conditioning system and the continuous opening pressure difference balancing time to balance the high-low pressure difference.
According to the control method for the shutdown differential pressure balance of the air conditioner, when the compressor is shut down, the high-low differential pressure is judged, and under the condition that the high-low differential pressure is larger than the first preset differential pressure, the opening degree and the continuous opening differential pressure balance time of the external machine expansion valve of the multi-split air conditioner are controlled, and/or the opening degree and the continuous opening differential pressure balance time of the internal machine expansion valve of the multi-split air conditioner are controlled, so that the high-low differential pressure is balanced quickly and timely. Therefore, the control method for the balance of the shutdown differential pressure of the air conditioner can realize the cancellation of the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, and can realize the simplification of a system, the reduction of cost and the improvement of the product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner.
Further, in an optional embodiment, the control method further comprises:
and if the high-low pressure difference is smaller than or equal to the first preset pressure difference, controlling the outer expansion valve and the inner expansion valve to keep the current opening degree and closing after delaying normal shutdown time, wherein the pressure difference balance time is longer than the normal shutdown time.
Further, in an optional embodiment, the differential pressure balancing time includes a first preset time, and if the high-low pressure difference is greater than the first preset pressure difference, the step of controlling the opening degree and the continuously-opened differential pressure balancing time of the outdoor expansion valve of the multi-split air-conditioning system includes:
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer machine expansion valve to keep the current opening degree and close after the multi-split air conditioner is continuously closed for the first preset time under the condition that the multi-split air conditioner is stopped in a refrigeration mode.
Further, in an optional embodiment, the differential pressure balancing time includes a second preset time, and if the high-low pressure difference is greater than the first preset pressure difference, the step of controlling the opening degree and the continuously-opened differential pressure balancing time of the outdoor expansion valve of the multi-split air-conditioning system includes:
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer machine expansion valve to increase the current opening degree and close after the multi-split air conditioner is continuously switched off for a second preset time under the condition that the multi-split air conditioner is stopped in a heating mode.
Further, in an optional embodiment, the pressure difference balance time includes a third preset time, and if the high-low pressure difference is greater than the first preset pressure difference, the step of controlling the opening degree and the continuously-opened pressure difference balance time of the indoor unit expansion valve of the multi-split air-conditioning system includes:
if the high-low pressure difference is greater than the first preset pressure difference, controlling an indoor unit expansion valve of the indoor unit in a starting state to keep a current opening degree and close after lasting for the third preset time under the condition that the multi-split air conditioner is shut down in a refrigeration mode, and controlling the indoor unit expansion valve of the indoor unit in a shutdown state to keep the opening degree in the shutdown state.
Further, in an optional embodiment, the pressure difference balance time includes a fourth preset time, and if the high-low pressure difference is greater than the first preset pressure difference, the step of controlling the opening degree and the continuously-opened pressure difference balance time of the indoor unit expansion valve of the multi-split air-conditioning system includes:
if the high-low pressure difference is greater than the first preset pressure difference, controlling an indoor unit expansion valve of the indoor unit in the starting state to keep the current opening degree and close after lasting for the fourth preset time under the condition that the multi-split air conditioner is stopped in the heating mode, and controlling the indoor unit expansion valve of the indoor unit in the shutdown state to keep the opening degree in the shutdown state.
Further, in an optional embodiment, the control method further comprises:
if the high-low pressure difference is smaller than or equal to the first preset pressure difference, controlling an external fan of the multi-split air conditioner to be closed after delaying normal shutdown time;
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer fan to keep the current rotating speed and close after the normal shutdown time is continued under the condition that the multi-split air conditioner is shut down in the refrigeration mode.
Further, in an optional embodiment, the control method further comprises:
if the high-low pressure difference is smaller than or equal to the first preset pressure difference, controlling an external fan of the multi-split air conditioner to be closed after delaying normal shutdown time;
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer fan to keep the current rotating speed and close after lasting for a fifth preset time under the condition that the multi-split air conditioner is shut down in the heating mode, wherein the fifth preset time is greater than the normal shutdown time.
Further, in an optional embodiment, the control method further comprises:
if the high-low pressure difference is greater than the first preset pressure difference, controlling an inner fan of the indoor unit in the starting state to keep the current wind shield and close after lasting for a sixth preset time under the condition that the multi-split air conditioner is stopped in the refrigeration mode, and controlling the inner fan of the indoor unit in the shutdown state to keep the closing state.
Further, in an optional embodiment, the control method further comprises:
if the high-low pressure difference is greater than the first preset pressure difference, under the condition that the multi-split air conditioner is shut down in the heating mode, controlling an inner fan of the indoor unit in the starting state to keep a current wind shield and close after lasting for a seventh preset time, and controlling the inner fan of the indoor unit in the shutdown state to keep a closing state.
Further, in an optional embodiment, the control method further comprises:
and if the high-low pressure difference is smaller than or equal to a second preset pressure difference, controlling the outer fan, the outer fan expansion valve, the inner fan and the inner fan expansion valve of the multi-split air-fuel cell to be closed, wherein the second preset pressure difference is smaller than or equal to the first preset pressure difference.
In a second aspect, an embodiment of the present invention provides a control device for balancing a shutdown pressure difference of an air conditioner, where the control device is applied to a multi-split air conditioner, and includes:
the control module is used for responding to a stop command to control the compressor of the multi-split air conditioner to stop;
the acquisition module is used for acquiring the high-low pressure difference of the multi-split air conditioner;
the judging module is used for judging whether the high-low pressure difference is greater than a first preset pressure difference;
the control module is further configured to control the opening degree and the continuous opening differential pressure balancing time of the outdoor unit expansion valve of the multi-split air conditioner and/or control the opening degree and the continuous opening differential pressure balancing time of the indoor unit expansion valve of the multi-split air conditioner to balance the high-low pressure differential pressure if the high-low pressure differential pressure is greater than the first preset pressure differential.
The control device for the shutdown differential pressure balance of the air conditioner can realize the cancellation of the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, and can realize the simplification of a system, the reduction of cost and the improvement of the product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner.
In a third aspect, an embodiment of the present invention provides a multi-split air conditioner, including a controller, where the controller is configured to execute computer instructions to implement the control method for balancing the shutdown differential pressure of the air conditioner according to any one of the foregoing embodiments.
The multi-split air conditioner provided by the invention can cancel the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, thereby realizing system simplification, cost reduction and product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner.
Drawings
Fig. 1 is a schematic flow chart of a control method for balancing shutdown differential pressure of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating the sub-steps of step S500 in FIG. 1;
FIG. 3 is a schematic flow chart illustrating the sub-steps of step S600 in FIG. 1;
fig. 4 is a block diagram schematically illustrating a structure of a control device for balancing a shutdown differential pressure of an air conditioner according to an embodiment of the present invention.
Description of reference numerals:
20-a control device for balancing the shutdown differential pressure of the air conditioner; 210-a control module; 220-an acquisition module; 230-a judgment 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.
Referring to fig. 1, an embodiment of the present invention provides a control method and a control device for shutdown pressure difference balance of an air conditioner, which are applied to a multi-split air conditioner, where the multi-split air conditioner may be a multi-split variable frequency air conditioning unit. The control method and the control device for the shutdown differential pressure balance of the air conditioner can realize the cancellation of the bypass branch by a control means on the basis of the configuration of the existing multi-split air conditioner, and realize the simplification of the system and the reduction of the cost on the premise of ensuring the reliability of the multi-split air conditioner.
The multi-split air conditioner can comprise an outdoor unit and a plurality of indoor units, wherein the outdoor unit is provided with an outdoor unit expansion valve and an outer fan, and each indoor unit is correspondingly provided with an inner unit expansion valve and an inner fan. In addition, the multi-split air conditioner can further comprise a high-pressure sensor and a low-pressure sensor, wherein the high-pressure sensor is arranged on the high-pressure side of the compressor of the multi-split air conditioner and used for detecting and obtaining high-pressure. The low-pressure sensor is arranged on the low-pressure side of the compressor and used for detecting the obtained low-pressure.
The multi-split air conditioner can further comprise a controller, and the controller is used for executing computer instructions to realize the control method for the air conditioner shutdown differential pressure balance provided by the embodiment of the invention. The controller is connected with the high-pressure sensor and the low-pressure sensor respectively, and is used for receiving the high-pressure and the low-pressure, and calculating to obtain a high-low pressure differential pressure according to the high-pressure and the low-pressure, wherein in this embodiment, the high-low pressure differential pressure is equal to an absolute value of a difference value obtained by subtracting the low-pressure from the high-pressure. In addition, the controller is respectively connected with the outer machine expansion valve, the outer fan, the inner machine expansion valve and the inner fan and is used for respectively controlling the outer machine expansion valve, the outer fan, the inner machine expansion valve and the inner fan according to the high-low pressure difference.
The controller may be an integrated circuit chip having signal processing capabilities. The controller may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible implementation manner, the air conditioner may further include a memory for storing program instructions executable by the controller, for example, the control device for balancing the shutdown pressure difference of the air conditioner provided by the embodiment of the present application includes at least one control device which can be stored in the memory in the form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller, for example, the memory may be integrated with the controller on the same chip.
Referring to fig. 1, based on the multi-split air conditioner, the method for controlling the shutdown pressure difference balance of the air conditioner may include the following steps:
and step S100, responding to the stop command to control the compressor of the multi-split air conditioner to stop.
In step S100, the controller controls the compressor to stop according to the received stop instruction, and starts timing after the compressor is stopped, while executing the following control steps. The shutdown command may be a signal sent by a user operation or a multi-line to warm shutdown.
Step S200, acquiring the high-low pressure difference of the multi-split air conditioner.
In step S200, a high pressure detected by the high pressure sensor and a low pressure detected by the low pressure sensor are received, and a high-low pressure differential pressure is calculated according to the high pressure and the low pressure, wherein the high-low pressure differential pressure is expressed by Δ P.
Step S300, judging whether the high-low pressure difference is greater than a first preset pressure difference.
In step S300, the first preset pressure difference is set according to actual needs, and is an empirical value, which may be represented by P1. The first predetermined differential pressure is 0.6-1.0 Mpa, and further 0.8 Mpa. It should be noted that the first preset differential pressure is a critical value that the compressor drive meets the start reliability, and if the high-low differential pressure is greater than the first preset differential pressure, it can be considered that the high-low differential pressure is too large, and at this time, the compressor does not meet the start reliability. Therefore, it is determined whether Δ P > P1 is satisfied, that is, whether the high-low pressure difference is too large and the requirement is not satisfied.
In step S400, if the high-low pressure difference is less than or equal to the first preset pressure difference, the multi-split air conditioner is controlled to perform normal control.
In step S400, if the high-low pressure difference is less than or equal to the first preset pressure difference, i.e. Δ P is less than or equal to P1, it is determined that the compressor driving satisfies the starting reliability, and the compressor can be started normally. Therefore, the control of the multi-split air conditioner for normal control can comprise the following control actions: under the condition of shutdown in a multi-split air cooling mode or a heating mode, controlling an outer machine expansion valve and an inner machine expansion valve to keep the current opening degree and to close after delaying normal shutdown time, and controlling an outer fan to keep the current rotating speed and to close after delaying normal shutdown time; under the condition of shutdown in a multi-split air cooling mode, controlling the internal fan to be closed; and under the condition of shutdown in a multi-split heating mode, the internal fan is controlled to be closed after blowing the waste heat. Wherein, the normal stop time is selected to be 40 seconds and is obtained by starting to count time after the compressor is stopped. In addition, the case of shutdown in the cooling mode or the heating mode of the multi-split air conditioning system refers to that the multi-split air conditioning system is operated in the cooling mode or in the heating mode before shutdown.
Step S500, if the high-low pressure difference is larger than the first preset pressure difference, controlling the opening degree of the outer expansion valve of the multi-split air conditioner and the continuous opening pressure difference balancing time, and/or controlling the opening degree of the inner expansion valve of the multi-split air conditioner and the continuous opening pressure difference balancing time, so that the high-low pressure difference is balanced.
In step S500, if the high-low pressure difference is greater than the first preset pressure difference, it is determined that the high-low pressure difference is too large and the compressor driving does not meet the start reliability, a shutdown pressure difference balancing control is performed, wherein the shutdown pressure difference balancing control may control at least one of the outer expansion valve and the inner expansion valve to balance the high-low pressure difference. Further, the opening degree and the continuous opening differential pressure balancing time of the outer expansion valve can be controlled, wherein the continuous opening differential pressure balancing time of the outer expansion valve means that the outer expansion valve is controlled to be continuously opened at the controlled opening degree and closed after the differential pressure balancing time is opened. In addition, the opening degree and the continuous opening differential pressure balancing time of the internal expansion valve can also be controlled, wherein the continuous opening differential pressure balancing time of the internal expansion valve means that the internal expansion valve is controlled to be continuously opened at the controlled opening degree and closed after the differential pressure balancing time is opened.
The pressure difference balance time of the outer expansion valve and the pressure difference balance time of the inner expansion valve may be the same or different. The differential pressure balance time is obtained by starting timing after the compressor is stopped, and the differential pressure balance time is longer than the normal stop time, namely, the time for controlling the delayed closing of the outer machine expansion valve and/or the inner machine expansion valve is longer than the delayed closing time of the normal control time under the condition that the high-low pressure difference is greater than the first preset pressure difference. Therefore, the high-low pressure difference can be fully balanced when the machine is stopped. In the embodiment, the pressure difference balance time can be selected to be 80-180 seconds, further can be selected to be 120 seconds, and can be correspondingly given after experience of pressure difference balance, liquid return and indoor machine tone quality.
Referring to fig. 2, since the multi-split air conditioner is shut down in the cooling mode and the heating mode differently, the pressure difference balancing time may include a first preset time, a second preset time, a third preset time, and a fourth preset time, wherein the first preset time, the second preset time, the third preset time, and the fourth preset time are all greater than the normal shutdown time. The first preset time, the second preset time, the third preset time and the fourth preset time can be the same or different; or the first preset time and the third preset time in the cooling mode are the same, and the second preset time and the fourth preset time in the heating mode are the same. In this embodiment, the first preset time, the second preset time, the third preset time and the fourth preset time are all the same, and are all 80 to 180 seconds, and further may be all 120 seconds. Step S500 may include the following substeps S510 to substep S540 depending on the mode of operation prior to shutdown.
In the case of a shutdown of the multi-split air conditioning system in the cooling mode, the following substeps can be carried out:
and a substep S510 of controlling the external machine expansion valve to maintain the current opening degree and close the external machine expansion valve after the external machine expansion valve continues for a first preset time under the condition that the multi-split air conditioner is shut down in the refrigeration mode if the high-low pressure differential pressure is greater than the first preset pressure differential pressure.
In the sub-step S510, it should be noted that, in the cooling operation state of the multi-split air conditioner, the outer machine expansion valve is in a full-open maximum opening state, and if the high-low pressure differential pressure is greater than the first preset pressure differential, the outer machine expansion valve is controlled to maintain the current opening, that is, to maintain the full-open maximum opening state, so that the high-low pressure differential pressure after shutdown can be ensured to be sufficiently balanced. And the expansion valve of the outdoor unit is closed after being continuously opened for a first preset time at the current opening degree, so that the high-pressure and low-pressure differential pressures are further fully balanced.
And a substep S520, if the high-low pressure difference is greater than the first preset pressure difference, controlling the indoor unit expansion valve of the indoor unit in the startup state to maintain the current opening degree and close after lasting for a third preset time under the condition that the multi-split air conditioner is stopped in the refrigeration mode, and controlling the indoor unit expansion valve of the indoor unit in the shutdown state to maintain the opening degree in the shutdown state.
In the sub-step S520, considering that some indoor units may be in the on state and some indoor units may be in the off state, in order to avoid affecting users who do not use the air conditioner, in this embodiment, if the high-low pressure difference is greater than the first preset pressure difference and the multi-split air conditioner is stopped in the cooling mode, the indoor units in the on state and the indoor units in the off state are respectively controlled. The indoor unit expansion valve of the indoor unit in the starting state can be controlled to keep the current opening degree and be closed to 0Pls after lasting for a third preset time, so that the indoor unit expansion valve of the indoor unit in the starting state is kept open, and the high-low pressure difference after shutdown can be ensured to be fully balanced; the indoor unit expansion valve of the indoor unit in the shutdown state can be controlled to maintain the opening degree in the shutdown state, so that the indoor unit expansion valve of the indoor unit in the shutdown state is closed, no refrigerant flows through the indoor unit, and the influence of the refrigerant flowing through by a user who does not use the air conditioner can be avoided.
In the case of shutdown in the heating mode of the multi-split air conditioner, the following substeps may be performed:
and a substep S530, if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer machine expansion valve to increase the current opening degree and close after the operation lasts for a second preset time under the condition that the multi-split air conditioner is stopped in the heating mode.
In the substep S530, it is noted that the opening degree of the outer expansion valve is small in the multi-split heating operation. In order to ensure that the high-low pressure difference is fully balanced and liquid return is also considered, if the high-low pressure difference is larger than a first preset pressure difference and the multi-split air conditioner is stopped in a heating mode, the current opening degree of the outer machine expansion valve is controlled to be increased, namely the opening degree of the outer machine expansion valve opened in the delayed closing process is larger than that of the outer machine expansion valve when the compressor is stopped, the opening degree of the outer machine expansion valve after the opening degree is increased in the stopping process is expressed by M, the outer machine expansion valve is closed after the opening degree is adjusted to M Pls and is maintained for a second preset time, wherein M is an empirical value, is selected from 120 to 320, is further selected from 220, and quick pressure difference balance is considered and liquid return is avoided.
And a substep S540, if the high-low pressure difference is greater than the first preset pressure difference, controlling the indoor unit expansion valve of the indoor unit in the on-state to maintain the current opening degree and to close after lasting for a fourth preset time under the condition that the multi-split air conditioner is stopped in the heating mode, and controlling the indoor unit expansion valve of the indoor unit in the off-state to maintain the opening degree in the off-state.
In the substep S540, similarly, considering that some indoor units may be in a power-on state and some indoor units may be in a power-off state among the plurality of indoor units, in order to avoid affecting users who do not use the air conditioner, in this embodiment, if the high-low pressure differential pressure is greater than the first preset pressure differential, and in a case where the multi-split air conditioner is stopped in a heating mode, the indoor unit expansion valve of the indoor unit in the power-on state is controlled to maintain a current opening degree and to be closed for a fourth preset time, so that it can be ensured that the high-low pressure differential pressure is sufficiently balanced after the stop; and the indoor unit expansion valve of the indoor unit in the shutdown state is controlled to maintain the opening degree in the shutdown state, so that the indoor unit expansion valve of the indoor unit in the shutdown state is closed, no refrigerant flows through the indoor unit, and the influence of the refrigerant flowing through by a user who does not use the air conditioner can be avoided.
With reference to fig. 1, in addition, in order to increase the adjustable range of the control pressure difference, and add adjustable elements, and enrich the adjustment mode, when entering the shutdown pressure difference balance control, on the basis of the above control mode, at least one of the outer fan and the inner fan may be controlled to further ensure the high-low pressure difference balance. Therefore, the control method of the air conditioner shutdown pressure difference balance may further include step S600.
And step S600, if the high-low pressure difference is larger than a first preset pressure difference, controlling the rotating speed of an outer fan of the multi-split air conditioner and continuously opening the running time of the fan, and/or controlling the wind gear of an inner fan of the multi-split air conditioner and continuously opening the running time of the fan.
In step S600, the external fan continuously turning on the fan running time means that the external fan is continuously turned on at the controlled rotation speed and is turned off after the fan running time is turned on. Similarly, the continuous fan opening time of the inner fan means that the inner fan is continuously opened by a controlled wind gear and is closed after the fan is opened for the running time. The running time of the outer fan and the running time of the inner fan can be the same or different. In addition, the running time of the fan can be more than or equal to the normal shutdown time, when the running time of the fan is more than the normal shutdown time, the running time of the fan can be the same as or different from the differential pressure balance time, and the running time of the fan can be 80-180 seconds, and further can be 120 seconds.
Referring to fig. 3, since the multi-split air conditioner is stopped in the cooling mode and the heating mode differently, the operating time of the fan includes a fifth preset time, a sixth preset time, and a seventh preset time. Step S600 may include the following substeps S610 to substep S640 depending on the mode of operation prior to shutdown.
In the case of a shutdown of the multi-split air conditioning system in the cooling mode, the following substeps can be carried out:
and a substep S610, if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer fan to keep the current rotating speed and close after the normal shutdown time is continued under the condition that the multi-split air conditioner is shut down in the refrigeration mode.
In the sub-step S610, it may be considered that the outer fan is continuously turned on for a running time equal to the normal shutdown time, and the outer fan is controlled to maintain the current rotation speed and is turned off after the normal shutdown time is continued, and it should be noted that the sub-step S610 may be considered as the same as the normal control of the outer fan, because if the outer fan is continuously operated for a time longer than the normal shutdown time, for example, for a long time of 120 seconds, the cooling medium may be cooled, the liquid return may be easily caused, and therefore, the control is performed in the same manner as the normal control.
And a substep S620, if the high-low pressure difference is greater than the first preset pressure difference, controlling the internal fan of the indoor unit in the starting state to keep the current wind level and to be closed after lasting for a sixth preset time under the condition that the multi-split air conditioner is stopped in the refrigeration mode, and controlling the internal fan of the indoor unit in the shutdown state to keep the closed state.
In the substep S620, considering that some indoor units may be in a power-on state and some indoor units may be in a power-off state in the plurality of indoor units, in order to avoid the influence of the start of the internal fan on users not using the air conditioner, in this embodiment, if the high-low pressure difference is greater than the first preset pressure difference, and in the case that the multi-split air conditioner is in a shutdown mode, the internal fan of the indoor unit in the power-on state is controlled to maintain the current wind level and to be turned off after lasting for a sixth preset time, so that convection heat exchange evaporation can be performed, the temperature of the low-temperature refrigerant in the copper pipe can be effectively increased, the low-pressure can be increased, liquid return can be effectively avoided, and meanwhile, the internal fan operates to cover the refrigerant sound, and thus, the user is prevented from complaint noise. Optionally, the sixth preset time is greater than the normal shutdown time, in this embodiment, the sixth preset time may be the same as the first preset time and the third preset time in the cooling mode, for example, the sixth preset time may be 80 to 180 seconds, and further may be 120 seconds. The inner fan of the indoor unit in the shutdown state is controlled to maintain the shutdown state, so that the influence of the starting of the inner fan on a user who does not use the air conditioner can be avoided.
In the case of shutdown in the heating mode of the multi-split air conditioner, the following substeps may be performed:
and a substep S630, if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer fan to keep the current rotating speed and close after a fifth preset time when the multi-split air conditioner is stopped in the heating mode, wherein the fifth preset time is greater than the normal stop time.
In the sub-step S630, the fifth preset time is not related to the sixth preset time, and is set according to the pressure difference balance, the liquid return, and the indoor unit sound quality experience. In this embodiment, the outer fan is controlled to maintain the current rotation speed and is closed after the fifth preset time, so as to further ensure the balance of the high-low pressure difference. The fifth preset time is greater than the normal shutdown time, and the fifth preset time may be the same as the second preset time and the fourth preset time in the heating mode. In this embodiment, the fifth preset time may be 80 to 180 seconds, and further may be 120 seconds.
And a substep S640 of, if the high-low pressure difference is greater than the first preset pressure difference, controlling the internal fan of the indoor unit in the on state to maintain the current wind level and to be turned off after a seventh preset time, and controlling the internal fan of the indoor unit in the off state to maintain the off state, when the multi-split air conditioner is stopped in the heating mode.
In the substep S640, considering that some indoor units may be in an on state and some indoor units may be in an off state among the plurality of indoor units, to avoid the influence of the start of the internal fan on users not using the air conditioner, in this embodiment, if the high-low pressure difference is greater than the first preset pressure difference and the multi-split air conditioner is stopped in the heating mode, the internal fan of the indoor unit in the on state is controlled to maintain the current wind level and be closed for the seventh preset time, so that the noise generated by the simple refrigerant flow can be avoided, and the user complaint can be avoided. The seventh preset time is greater than the normal shutdown time, and the seventh preset time may be the same as the second preset time and the fourth preset time in the heating mode. In this embodiment, the seventh preset time may be 80 to 180 seconds, and further may be 120 seconds. The inner fan of the indoor unit in the shutdown state is controlled to maintain the shutdown state, so that the influence of the starting of the inner fan on a user not using the air conditioner can be avoided.
Referring to fig. 1, in addition, during the control execution of the control steps S500 and S600, it may also be determined whether the high-low pressure difference is less than or equal to a second preset pressure difference, so as to determine whether the shutdown pressure difference balance control may be returned, and further, the control method of the shutdown pressure difference balance of the air conditioner may further include step S700.
Step S700, if the high-low pressure difference is smaller than or equal to a second preset pressure difference, the outer fan expansion valve, the inner fan and the inner fan expansion valve of the multi-split air-fuel cell are controlled to be closed, wherein the second preset pressure difference is smaller than or equal to the first preset pressure difference.
In step S700, the second predetermined differential pressure is represented by P2, and the second predetermined differential pressure P2 is an empirical value, and may be 0-0.6Mpa, and may be 0.5 Mpa. And when detecting that the delta P is less than or equal to P2, driving the compressor to meet the starting reliability, and controlling the outer fan, the outer fan expansion valve, the inner fan and the inner fan expansion valve to be immediately closed if the compressor can be normally started. It should be noted that P2 is not greater than P1, which may not be equal to each other, so as to avoid the influence caused by pressure difference fluctuation and further ensure reliability.
In summary, according to the control method for balancing the shutdown differential pressure of the air conditioner provided by the present invention, when the compressor is shutdown, the high-low differential pressure is determined, and when the high-low differential pressure is greater than the first preset differential pressure, the opening degree of the external expansion valve of the multi-split air conditioner and the continuous differential pressure balancing time are controlled, and/or the opening degree of the internal expansion valve of the multi-split air conditioner and the continuous differential pressure balancing time are controlled, so that the high-low differential pressure is balanced quickly and timely. Therefore, the control method for the balance of the shutdown differential pressure of the air conditioner can realize the cancellation of the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, and can realize the simplification of a system, the reduction of cost and the improvement of the product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner.
Referring to fig. 4, in order to execute possible steps of the control method for balancing the shutdown differential pressure of the air conditioner according to the embodiments, an embodiment of the invention provides a control device 20 for balancing the shutdown differential pressure of the air conditioner, which is applied to the air conditioner and is used for executing the control method for balancing the shutdown differential pressure of the air conditioner. It should be noted that the basic principle and the generated technical effect of the control device 20 for balancing the shutdown differential pressure of the air conditioner provided by the embodiment of the present invention are substantially the same as those of the above embodiment, and for the sake of brief description, no part of the embodiment may refer to the corresponding contents in the above embodiment.
The control device 20 for balancing the air conditioner shutdown pressure difference comprises a control module 210, an obtaining module 220 and a judging module 230.
The control module 210 is configured to control the compressor of the multi-split air conditioner to be shut down in response to a shutdown command.
Optionally, the control module 210 may be specifically configured to execute step S100 in the control method described above, so as to achieve the corresponding technical effect.
The obtaining module 220 is configured to obtain a high-low pressure difference of the multi-split air-fuel line.
Optionally, the obtaining module 220 may be specifically configured to execute step S200 in the control method, so as to achieve a corresponding technical effect.
The determining module 230 is configured to determine whether the high-low pressure difference is greater than a first preset pressure difference.
Optionally, the determining module 230 may be specifically configured to execute step S300 in the above control method, so as to achieve a corresponding technical effect.
The control module 210 is configured to control the multi-split air conditioner to perform normal control if the high-low pressure difference is less than or equal to a first preset pressure difference.
Optionally, the control module 210 may be specifically configured to execute step S400 in the control method described above, so as to achieve a corresponding technical effect.
The control module 210 is configured to control an opening degree and a continuously-opened differential pressure balancing time of the outdoor unit expansion valve of the multi-split air conditioner and/or control an opening degree and a continuously-opened differential pressure balancing time of the indoor unit expansion valve of the multi-split air conditioner to balance the high-low differential pressure if the high-low differential pressure is greater than the first preset differential pressure.
Optionally, the control module 210 may be specifically configured to execute the step S500 and each sub-step thereof in the control method described above, so as to achieve the corresponding technical effect.
The control module 210 is configured to control a rotation speed of an external fan of the multi-split air conditioner and a running time of the fan if the high-low pressure difference is greater than a first preset pressure difference, and/or control a wind gear of an internal fan of the multi-split air conditioner and the running time of the fan.
Optionally, the control module 210 may be specifically configured to execute the step S600 and each sub-step thereof in the control method described above, so as to achieve the corresponding technical effect.
The control module 210 is configured to control the outer fan, the outer expansion valve, the inner fan, and the inner expansion valve of the multi-split air-fuel machine to close if the high-low pressure differential pressure is less than or equal to a second preset pressure differential.
Optionally, the control module 210 may be specifically configured to execute step S700 in the control method described above, so as to achieve a corresponding technical effect.
In addition, embodiments of the present invention further provide a multi-split air conditioner, where the multi-split air conditioner includes a controller, and the controller is configured to execute computer instructions to implement the control method for balancing the shutdown differential pressure of the air conditioner provided in any of the above embodiments.
The control method and the device for the shutdown differential pressure balance of the air conditioner and the multi-split air conditioner provided by the invention can realize the cancellation of the bypass branch through a control means according to the configuration of the existing multi-split air conditioner on the premise of canceling the bypass branch, and realize the simplification of a system, the reduction of cost and the improvement of product competitiveness on the premise of ensuring the reliability of the multi-split air conditioner. In addition, the control method, the control device and the multi-connected machine for the shutdown differential pressure balance of the air conditioner can combine the high-low differential pressure of the initial shutdown and the high-low differential pressure after the shutdown in the control process, realize secondary identification, and fully ensure the rapid, timely (advanced) and reliable balance of the shutdown high-low differential pressure. By different actions of the inner fan, the outer fan, the inner machine expansion valve and the outer machine expansion valve, different influences of the indoor machines in the on-state or off-state of the multi-split air conditioner are correspondingly controlled to start and stop and open degree, the balance of shutdown differential pressure is guaranteed, liquid return is avoided, and reliability is guaranteed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (7)

1. A control method for air conditioner shutdown differential pressure balance is applied to a multi-split air conditioner, and is characterized by comprising the following steps:
controlling the compressor of the multi-split air conditioner to stop in response to a stop command;
acquiring the high-low pressure difference of the multi-split air conditioner;
judging whether the high-low pressure difference is greater than a first preset pressure difference or not;
if the high-low pressure difference is larger than the first preset pressure difference, controlling the opening degree of an outer expansion valve of the multi-split air conditioner and the continuous opening pressure difference balancing time, and/or controlling the opening degree of the inner expansion valve of the multi-split air conditioner and the continuous opening pressure difference balancing time to balance the high-low pressure difference;
if the high-low pressure difference is smaller than or equal to the first preset pressure difference, controlling the outer machine expansion valve and the inner machine expansion valve to keep the current opening degree and close after delaying normal shutdown time, wherein the pressure difference balance time is longer than the normal shutdown time;
the differential pressure balance time comprises a first preset time and a third preset time, and if the high-low pressure difference is greater than the first preset pressure difference, the step of controlling the opening degree of the indoor unit expansion valve of the multi-split air conditioner and continuously opening the differential pressure balance time comprises the following steps:
if the high-low pressure difference is greater than the first preset pressure difference, under the condition that the multi-split air conditioner is shut down in a refrigeration mode, controlling an inner expansion valve of the indoor unit in a starting state to keep a current opening degree and close after lasting for the third preset time, controlling an inner expansion valve of the indoor unit in a shutdown state to keep the opening degree in the shutdown state, controlling an outer expansion valve to keep the current opening degree and close after lasting for the first preset time, controlling an outer fan of the multi-split air conditioner to keep a current rotating speed and close after lasting for the normal shutdown time, controlling an inner fan of the indoor unit in the starting state to keep a current wind gear and close after lasting for a sixth preset time, and controlling an inner fan of the indoor unit in the shutdown state to keep a closed state;
if the high-low pressure difference is smaller than or equal to the first preset pressure difference, controlling an external fan of the multi-split air conditioner to be closed after delaying normal shutdown time; the control method further comprises the following steps:
and if the high-low pressure difference is smaller than or equal to a second preset pressure difference, controlling the outer fan, the outer fan expansion valve, the inner fan and the inner fan expansion valve of the multi-split air-fuel cell to be closed, wherein the second preset pressure difference is smaller than or equal to the first preset pressure difference.
2. The method as claimed in claim 1, wherein the differential pressure balancing time comprises a second predetermined time, and the step of controlling the opening degree of the outdoor unit expansion valve of the multi-split air conditioner and the continuously opened differential pressure balancing time if the high-low pressure differential pressure is greater than the first predetermined pressure differential pressure comprises:
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer machine expansion valve to increase the current opening degree and close after the multi-split air conditioner is continuously switched off for a second preset time under the condition that the multi-split air conditioner is stopped in a heating mode.
3. The method for controlling shutdown differential pressure balance of an air conditioner according to claim 1, wherein the differential pressure balance time includes a fourth preset time, and the step of controlling the opening degree of the indoor expansion valve of the multi-split air conditioner and the continuously opened differential pressure balance time if the high-low pressure differential pressure is greater than the first preset pressure differential comprises:
if the high-low pressure difference is greater than the first preset pressure difference, controlling an indoor unit expansion valve of the indoor unit in the starting state to keep the current opening degree and close after lasting for the fourth preset time under the condition that the multi-split air conditioner is stopped in the heating mode, and controlling the indoor unit expansion valve of the indoor unit in the shutdown state to keep the opening degree in the shutdown state.
4. The control method of air conditioner shutdown differential pressure equalization of claim 1, further comprising:
and if the high-low pressure difference is greater than the first preset pressure difference, controlling the outer fan to keep the current rotating speed and close after lasting for a fifth preset time under the condition that the multi-split air conditioner is shut down in the heating mode, wherein the fifth preset time is greater than the normal shutdown time.
5. The control method of air conditioner shutdown differential pressure equalization of claim 1, further comprising:
if the high-low pressure difference is greater than the first preset pressure difference, controlling an internal fan of the indoor unit in the starting state to keep the current wind level and close after lasting for a seventh preset time under the condition that the multi-split air conditioner is stopped in the heating mode, and controlling the internal fan of the indoor unit in the shutdown state to keep the closing state.
6. A control device for balancing air-conditioning shutdown differential pressure, which is applied to a multi-split air conditioner and is used for realizing the control method for balancing air-conditioning shutdown differential pressure according to any one of claims 1 to 5, wherein the control device comprises:
the control module is used for responding to a stop command to control the compressor of the multi-split air conditioner to stop;
the acquisition module is used for acquiring the high-low pressure difference of the multi-split air conditioner;
the judging module is used for judging whether the high-low pressure difference is greater than a first preset pressure difference;
the control module is further used for controlling the opening degree and the continuous opening differential pressure balancing time of the outer expansion valve of the multi-split air conditioner and/or controlling the opening degree and the continuous opening differential pressure balancing time of the inner expansion valve of the multi-split air conditioner to balance the high-low pressure differential pressure if the high-low pressure differential pressure is greater than the first preset pressure differential; and the controller is used for controlling the outer machine expansion valve and the inner machine expansion valve to keep the current opening degree and close after delaying the normal shutdown time if the high-low pressure difference is smaller than or equal to the first preset pressure difference, wherein the pressure difference balance time is longer than the normal shutdown time.
7. A multi-split air conditioner characterized by comprising a controller for executing computer instructions to realize the control method of air conditioner shutdown differential pressure balance according to any one of claims 1 to 5.
CN202110960696.2A 2021-08-20 2021-08-20 Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner Active CN113606739B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110960696.2A CN113606739B (en) 2021-08-20 2021-08-20 Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110960696.2A CN113606739B (en) 2021-08-20 2021-08-20 Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner

Publications (2)

Publication Number Publication Date
CN113606739A CN113606739A (en) 2021-11-05
CN113606739B true CN113606739B (en) 2022-08-12

Family

ID=78341472

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110960696.2A Active CN113606739B (en) 2021-08-20 2021-08-20 Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner

Country Status (1)

Country Link
CN (1) CN113606739B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114017898B (en) * 2021-11-08 2023-04-28 青岛海信日立空调***有限公司 Multi-split system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413051A (en) * 1990-04-27 1992-01-17 Matsushita Electric Ind Co Ltd Pressure control device for air conditioner
JP2001235238A (en) * 2000-02-24 2001-08-31 Daikin Ind Ltd Heat pump type air-conditioning system
JP2016121840A (en) * 2014-12-25 2016-07-07 株式会社富士通ゼネラル Air conditioning device
CN106225171A (en) * 2016-08-16 2016-12-14 广东美的暖通设备有限公司 Blower control method when a kind of air-conditioning is shut down and air-conditioning
CN107218742A (en) * 2017-06-12 2017-09-29 珠海格力电器股份有限公司 Heat pump and heat pump control method
CN109185094A (en) * 2018-08-17 2019-01-11 珠海格力电器股份有限公司 A kind of method, apparatus and unit, air-conditioning system of control compression machine-cut cylinder
CN112984620A (en) * 2021-03-29 2021-06-18 宁波奥克斯电气股份有限公司 Differential pressure balancing method and device for multi-split air conditioner and multi-split air conditioner

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109916043B (en) * 2019-02-02 2021-04-06 广东美的暖通设备有限公司 Mode switching control method and air conditioning system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0413051A (en) * 1990-04-27 1992-01-17 Matsushita Electric Ind Co Ltd Pressure control device for air conditioner
JP2001235238A (en) * 2000-02-24 2001-08-31 Daikin Ind Ltd Heat pump type air-conditioning system
JP2016121840A (en) * 2014-12-25 2016-07-07 株式会社富士通ゼネラル Air conditioning device
CN106225171A (en) * 2016-08-16 2016-12-14 广东美的暖通设备有限公司 Blower control method when a kind of air-conditioning is shut down and air-conditioning
CN107218742A (en) * 2017-06-12 2017-09-29 珠海格力电器股份有限公司 Heat pump and heat pump control method
CN109185094A (en) * 2018-08-17 2019-01-11 珠海格力电器股份有限公司 A kind of method, apparatus and unit, air-conditioning system of control compression machine-cut cylinder
CN112984620A (en) * 2021-03-29 2021-06-18 宁波奥克斯电气股份有限公司 Differential pressure balancing method and device for multi-split air conditioner and multi-split air conditioner

Also Published As

Publication number Publication date
CN113606739A (en) 2021-11-05

Similar Documents

Publication Publication Date Title
US9651294B2 (en) Outdoor unit of air conditioner and air conditioner
CN110579010B (en) Control method and control device for electronic expansion valve of multi-split internal machine and air conditioner
WO2008016228A1 (en) Method for controlling electronic expansion valve of air conditioner
CN110594992A (en) Air conditioner preheating control method and device and air conditioner
CN112628984B (en) Control method and device for electronic expansion valve of air conditioner internal unit and air conditioner
US11703242B2 (en) Avoiding coil freeze in HVAC systems
JP2014115011A (en) Air conditioner
US11639803B2 (en) System and method for identifying causes of HVAC system faults
CN113606739B (en) Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner
CN113983661B (en) Computer room air conditioner control method, terminal and storage medium
CN113494764A (en) Control method of multi-split air conditioner, multi-split air conditioner and storage medium
CN112984867B (en) Air conditioner heating oil return control method and device and air conditioner
JP2011144951A (en) Air conditioner
CN109974202B (en) Control method and device for slowing down frosting and air conditioner
CN110017580B (en) Fan coil and cold and heat source equipment mode interlocking control method and device and air conditioner
CN111780375A (en) Energy-saving control method and system of air conditioner, storage medium and air conditioner
CN114791151B (en) Control method and device for electronic expansion valve of air conditioner, air conditioner and storage medium
JP2014105967A (en) Air conditioning equipment
CN114811862A (en) Refrigerant system, and control method and control device thereof
JP2014102041A (en) Air conditioner
CN114251795A (en) One-driving-multiple air conditioner heating mode internal fan starting control method and device and air conditioner
JP4778849B2 (en) Air conditioner
CN109323362A (en) Processing method, processing system and the air conditioner of secondary refrigerant leakage failure
US11486599B2 (en) HVAC system operated with adaptive discharge air temperature setpoint
US12007134B2 (en) Avoiding coil freeze in HVAC systems

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20221010

Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District

Patentee after: NINGBO AUX ELECTRIC Co.,Ltd.

Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd.

Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province

Patentee before: NINGBO AUX ELECTRIC Co.,Ltd.

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

TR01 Transfer of patent right