CN111928419A - Control method and system for multi-split air conditioning unit - Google Patents
Control method and system for multi-split air conditioning unit Download PDFInfo
- Publication number
- CN111928419A CN111928419A CN202010675695.9A CN202010675695A CN111928419A CN 111928419 A CN111928419 A CN 111928419A CN 202010675695 A CN202010675695 A CN 202010675695A CN 111928419 A CN111928419 A CN 111928419A
- Authority
- CN
- China
- Prior art keywords
- outdoor unit
- electronic expansion
- type
- expansion valve
- opening degree
- 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.)
- Granted
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
- F24F11/32—Responding to malfunctions or emergencies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
-
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—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
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method and a control system of a multi-split air conditioning unit. The invention aims to solve the problem that the working capacity of the multi-split air conditioning unit cannot be fully exerted due to single operation process and limited regulation capacity of a control method of the existing multi-split air conditioning unit when a plurality of outdoor units are operated in parallel. For this purpose, the invention selectively adjusts the opening degree of the main electronic expansion valve of the first type outdoor unit, the opening degree of the economizer electronic expansion valve of the first type outdoor unit, the opening degrees of the main electronic expansion valves of a plurality of indoor units and the frequency of the compressor of the second type outdoor unit and/or alarms to stop the multi-split air conditioning unit according to the actual exhaust temperature of all the first type outdoor units when the number of the first type outdoor units and the number of the second type outdoor units are not zero. Therefore, the multi-split air conditioning unit can be controlled in stages with gradient, and the overall working capacity of the multi-split air conditioning unit is fully exerted.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method and a control system of a multi-split air conditioning unit.
Background
In the multi-split air conditioning unit, air pipes and liquid pipes of a plurality of air conditioning outdoor units are respectively connected in a converging manner, and the converged air pipes and liquid pipes are respectively connected with different air conditioning indoor units through a plurality of branch pipes.
Chinese patent application document (CN101086370A) discloses an air conditioner and a control method thereof, the air conditioner includes a plurality of outdoor units, a plurality of indoor units, each outdoor unit includes a compressor, an outdoor heat exchanger and an outdoor electromagnetic expansion valve; each indoor unit comprises an indoor heat exchanger and an indoor electromagnetic expansion valve, and each indoor unit is connected with the outdoor unit. The control method of the air conditioner mainly adjusts the opening degree of the outdoor electromagnetic expansion valve according to the actual exhaust temperature of each compressor so as to control the difference value of the exhaust temperatures of the plurality of compressors within a reasonable range.
However, when a plurality of outdoor units are operated in parallel, the operating states of the outdoor units are often greatly different due to uneven refrigerant distribution, and the control method of the air conditioner has the problems of single operation process and limited adjusting capacity, so that the working capacity of the multi-split air conditioning unit cannot be fully exerted.
Accordingly, there is a need in the art for a new control method and system for a multi-split air conditioning unit to solve the above problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the working capacity of the multi-split air conditioning unit cannot be fully exerted due to single operation process and limited regulation capacity in the control method of the existing multi-split air conditioning unit when a plurality of outdoor units operate in parallel, the invention provides a control method and a control system of the multi-split air conditioning unit.
The invention provides a control method of a multi-split air conditioning unit, wherein the multi-split air conditioning unit comprises a plurality of outdoor units and a plurality of indoor units which are connected through refrigerant pipelines, and the control method comprises the following steps: acquiring actual exhaust temperatures of all the compressors of the outdoor unit; calculating the number of the first-class outdoor units of which the actual discharge temperatures are greater than or equal to a preset lowest discharge temperature early warning value and the number of the second-class outdoor units of which the actual discharge temperatures are less than the preset lowest discharge temperature early warning value; when the number of the first type outdoor units and the number of the second type outdoor units are not zero, selectively adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor units, the opening degree of an economizer electronic expansion valve of the first type outdoor units, the opening degrees of main circuit electronic expansion valves of the indoor units, the frequency of a compressor of the second type outdoor units and/or enabling the multi-split air conditioner unit to alarm and stop according to the actual exhaust temperature of all the first type outdoor units.
As a preferred aspect of the control method according to the present invention, the step of selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degrees of the main electronic expansion valves of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioner unit according to the actual discharge temperatures of all the first outdoor units includes: and if the actual exhaust temperature of the first type outdoor unit is less than a first exhaust temperature threshold value, adjusting the opening degree of an economizer electronic expansion valve of the first type outdoor unit, wherein the first exhaust temperature threshold value is greater than the preset lowest exhaust temperature early warning value.
As a preferable aspect of the control method according to the present invention, the step of selectively adjusting an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm stop of the multi-split air conditioner set according to the actual discharge temperatures of all the first-type outdoor units further includes: if the actual discharge temperature of the first type outdoor unit is greater than or equal to the first discharge temperature threshold and less than a second discharge temperature threshold, keeping the superheat degree of an economizer of the first type outdoor unit at a first target superheat degree; adjusting the opening degree of main electronic expansion valves of the indoor units when the multi-split air conditioning unit operates in a refrigerating mode; and adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor unit when the multi-split air conditioning unit is in heating operation.
As a preferable aspect of the control method according to the present invention, the step of selectively adjusting an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm stop of the multi-split air conditioner set according to the actual discharge temperatures of all the first-type outdoor units further includes: if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the second discharge temperature threshold value and less than a preset maximum discharge temperature early warning value, keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree and reducing the operating frequency of a compressor of the second type of outdoor unit; adjusting the superheat degree of the indoor heat exchangers of the indoor units to a second target superheat degree when the multi-split air conditioning unit operates in a refrigerating mode; and adjusting the superheat degree of the outdoor heat exchanger of the first type of outdoor unit to a third target superheat degree during heating operation of the multi-split air conditioning unit.
As a preferable aspect of the control method according to the present invention, the step of selectively adjusting an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm stop of the multi-split air conditioner set according to the actual discharge temperatures of all the first-type outdoor units further includes: and if the actual exhaust temperature of the first type of outdoor unit is greater than or equal to the preset maximum exhaust temperature early warning value, the multi-split air conditioning unit is stopped by alarming.
Then, the invention also provides a control system of the multi-split air conditioning unit, wherein the multi-split air conditioning unit comprises a plurality of outdoor units and a plurality of indoor units which are connected through refrigerant pipelines, and the control system comprises an acquisition module, a calculation module and an execution module; the acquisition module is used for acquiring the actual exhaust temperature of the compressors of all the outdoor units; the calculation module is used for calculating the number of the first type outdoor units of which the actual discharge temperatures are greater than or equal to a preset lowest discharge temperature early warning value and the number of the second type outdoor units of which the actual discharge temperatures are less than the preset lowest discharge temperature early warning value; when the number of the first type outdoor units and the number of the second type outdoor units are not zero, the execution module is used for selectively adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor unit, the opening degree of an economizer electronic expansion valve of the first type outdoor unit, the opening degrees of main circuit electronic expansion valves of the indoor units, the frequency of a compressor of the second type outdoor unit and/or enabling the multi-split air conditioner unit to stop alarming according to the actual exhaust temperature of all the first type outdoor units.
As a preferable aspect of the control system provided in the present invention, the "executing module is configured to selectively adjust an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm of the multi-split air conditioner group to stop according to the actual discharge temperature of all the first-type outdoor units" includes: if the actual exhaust temperature of the first type outdoor unit is less than a first exhaust temperature threshold value, the execution module is used for adjusting the opening degree of an electronic expansion valve of an economizer of the first type outdoor unit, wherein the first exhaust temperature threshold value is greater than the preset lowest exhaust temperature early warning value.
As a preferable aspect of the control system provided by the present invention, the "executing module is configured to selectively adjust an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm of the multi-split air conditioner unit to stop according to the actual discharge temperature of all the first-type outdoor units," and further includes: if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the first discharge temperature threshold and less than a second discharge temperature threshold, the execution module is used for keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree; the execution module is used for adjusting the opening degree of a main electronic expansion valve of the indoor units when the multi-split air conditioning unit operates in a refrigerating mode; the execution module is used for adjusting the opening degree of a main electronic expansion valve of the first type of outdoor unit when the multi-split air conditioning unit is in heating operation.
As a preferable aspect of the control system provided by the present invention, the "executing module is configured to selectively adjust an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm of the multi-split air conditioner unit to stop according to the actual discharge temperature of all the first-type outdoor units," and further includes: if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the second discharge temperature threshold and less than a preset maximum discharge temperature early warning value, the execution module is used for keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree and reducing the operating frequency of a compressor of the second type of outdoor unit; the execution module is used for adjusting the superheat degree of the indoor heat exchangers of the indoor units to a second target superheat degree when the multi-split air conditioning unit operates in a refrigerating mode; the execution module is used for adjusting the superheat degree of the outdoor heat exchanger of the first type of outdoor unit to a third target superheat degree during heating operation of the multi-split air conditioning unit.
As a preferable aspect of the control system provided by the present invention, the "executing module is configured to selectively adjust an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm of the multi-split air conditioner unit to stop according to the actual discharge temperature of all the first-type outdoor units," and further includes: and if the actual exhaust temperature of the first type of outdoor unit is greater than or equal to the preset maximum exhaust temperature early warning value, the execution module is used for enabling the multi-split air conditioning unit to alarm and stop.
According to the control method and the system of the multi-split air conditioning unit, when the number of the first-class outdoor units with the actual exhaust temperatures larger than or equal to the preset lowest exhaust temperature early warning value and the number of the second-class outdoor units with the actual exhaust temperatures smaller than the preset lowest exhaust temperature early warning value are not zero, the opening degree of the main electronic expansion valve of the first-class outdoor unit, the opening degree of the economizer electronic expansion valve of the first-class outdoor unit, the opening degrees of the main electronic expansion valves of the indoor units, the frequency of the compressor of the second-class outdoor unit and/or the alarm shutdown of the multi-split air conditioning unit are selectively adjusted according to the actual exhaust temperatures of all the first-class outdoor units. Therefore, when the operating states of the outdoor units are greatly different due to uneven refrigerant distribution, the multi-split air conditioning unit can be comprehensively controlled by a method with steps in stages, so that the outdoor units work in a coordinated mode, and the overall working capacity of the multi-split air conditioning unit is fully exerted.
In addition, according to the control method and system of the multi-split air conditioning unit of the present invention, if the actual discharge temperature of the first type outdoor unit is less than the first discharge temperature threshold value, the opening degree of the economizer electronic expansion valve of the first type outdoor unit is adjusted. Therefore, when the multi-split air conditioning unit is adjusted, the opening degree of the electronic expansion valve of the economizer of the first type outdoor unit is adjusted, and then the next adjustment measure is taken when the adjustment of the first type outdoor unit is insufficient to achieve the adjustment purpose, so that the normal working state of the first type outdoor unit is ensured, and the influence on other outdoor units is reduced to the greatest extent.
Drawings
The control method of the multi-split air conditioning unit according to the present invention will be described with reference to the accompanying drawings in conjunction with the multi-split air conditioning unit. In the drawings:
fig. 1 is a schematic diagram illustrating a refrigerant cycle during a refrigerating operation of the multi-split air conditioning unit according to the embodiment;
fig. 2 is a schematic diagram of a refrigerant cycle during heating operation of the multi-split air conditioning unit according to the embodiment;
fig. 3 is a basic flow diagram of a control method of a multi-split air conditioning unit according to the embodiment;
fig. 4 is a schematic overall flow chart of the control method of the multi-split air conditioning unit according to the embodiment.
List of reference numerals
11-a first type outdoor unit; 12-outdoor unit of the second kind;
21-a compressor; a 22-four-way reversing valve; 23-an outdoor heat exchanger; 24-outdoor electronic expansion valve; 25-an economizer; 26-economizer electronic expansion valve; 27-a gas-liquid separator;
3-an indoor unit; 31-indoor heat exchanger; 32-indoor electronic expansion valve
41-a first refrigerant distribution pipe; 42-second refrigerant distribution pipe.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the multi-split air conditioning unit in the drawings has two outdoor units, the number of the outdoor units is not constant, and those skilled in the art can adjust the number of the outdoor units as needed to suit specific application occasions without departing from the principle of the present invention.
It should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to solve the above problems in the prior art, that is, to solve the problem that the working capacity of the multi-split air conditioning unit cannot be fully exerted due to a single operation process and limited adjustment capacity in the control method of the existing multi-split air conditioning unit when a plurality of outdoor units operate in parallel, the present embodiment provides a control method and a system of the multi-split air conditioning unit.
The present embodiment takes the multi-split air conditioning unit shown in fig. 1 and fig. 2 as an example to describe a control method of the multi-split air conditioning unit of the present embodiment. The multi-split air conditioning unit includes a first refrigerant distribution pipe 41 and a second refrigerant distribution pipe 42, and a plurality of outdoor units (such as a first-type outdoor unit 11 and a second-type outdoor unit 12 in fig. 1 and 2) and a plurality of indoor units 3 connected to both ends of the first refrigerant distribution pipe 41 and the second refrigerant distribution pipe 42;
each outdoor unit comprises a compressor 21, a four-way reversing valve 22, an outdoor heat exchanger 23, an economizer 25, an outdoor electronic expansion valve 24, an economizer electronic expansion valve 26 and a gas-liquid separator 27; the economizer 25 includes a first passage and a second passage that exchange heat with each other; a first end of the four-way selector valve 22 (e.g., the lower end of the four-way selector valve 22 in fig. 1 and 2) is in communication with the discharge port of the compressor 21; a second end (for example, the 1 st end above the four-way reversing valve 22 in fig. 1 and 2) of the four-way reversing valve 22 is sequentially communicated with the outdoor heat exchanger 23, the outdoor electronic expansion valve 24, and the outdoor end of the first refrigerant distribution pipe 41 after the first channel is connected; the third end (the 2 nd end above the four-way reversing valve 22 in fig. 1 and 2) of the four-way reversing valve 22 is communicated with the first inlet of the gas-liquid separator 27, and the outlet of the gas-liquid separator 27 is communicated with the suction port of the compressor 21; the fourth end (the upper 3 rd end of the four-way reversing valve 22 in fig. 1 and 2) of the four-way reversing valve 22 is connected with the outdoor end of the second refrigerant distribution pipe 42; one end of the economizer electronic expansion valve 26 is connected to a pipeline between the first channel of the economizer 25 and the first refrigerant distribution pipe 41, and the other end of the economizer electronic expansion valve 26 is communicated with the second inlet of the gas-liquid separator 27 through the second channel of the economizer 25;
each indoor unit 3 includes an indoor electronic expansion valve 32 and an indoor heat exchanger 31; one end of the indoor electronic expansion valve 32 is connected to the indoor end of the first refrigerant distribution pipe 41, and the other end is connected to the indoor end of the second refrigerant distribution pipe 42 after communicating with the indoor heat exchanger 31.
Fig. 1 is a schematic diagram of refrigerant circulation during a cooling operation of the multi-split air conditioning unit according to the embodiment, where a refrigerant circulation route is as follows: compressor 21 → four-way selector valve 22 → outdoor heat exchanger 23 → first passage of economizer 25 → indoor electronic expansion valve 32 → indoor heat exchanger 31 → four-way selector valve 22 → gas-liquid separator 27 → compressor 21; when the electronic expansion valve 26 of the economizer is opened, the electronic expansion valve further comprises a refrigerant circulation branch: the first passage of the economizer 25 → the electronic expansion valve 26 of the economizer → the second passage of the economizer 25 → the gas-liquid separator 27.
Fig. 2 is a schematic diagram of a refrigerant cycle during heating operation of the multi-split air conditioning unit of the embodiment, where a refrigerant cycle route is as follows: compressor 21 → four-way selector valve 22 → indoor heat exchanger 31 → indoor electronic expansion valve 32 → first passage of economizer 25 → outdoor electronic expansion valve 24 → outdoor heat exchanger 23 → four-way selector valve 22 → gas-liquid separator 27 → compressor 21; when the electronic expansion valve 26 of the economizer is opened, the electronic expansion valve further comprises a refrigerant circulation branch: indoor electronic expansion valve 32 → economizer electronic expansion valve 26 → second passage of the economizer 25 → gas-liquid separator 27.
First, the present embodiment provides a method for controlling a multi-split air conditioning unit, where the multi-split air conditioning unit includes a plurality of outdoor units and a plurality of indoor units 3 connected by refrigerant pipes, and as shown in fig. 3 and 4, the method includes:
s1, acquiring actual discharge temperatures of the compressors 21 of all the outdoor units;
s2, calculating the number of the first type outdoor units 11 having the actual discharge temperature greater than or equal to the preset lowest discharge temperature warning value and the number of the second type outdoor units 12 having the actual discharge temperature less than the preset lowest discharge temperature warning value;
s3, when the number of the first type outdoor units 11 and the number of the second type outdoor units 12 are not zero, selectively adjusting the opening degree of the main electronic expansion valve of the first type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first type outdoor unit 11, the opening degrees of the main electronic expansion valves of the plurality of indoor units 3, the frequency of the compressor 21 of the second type outdoor unit 12 and/or stopping the multi-split air conditioning unit by alarming according to the actual discharge temperature of all the first type outdoor units 11.
For example, the embodiment is described in the case that the multi-split air conditioning unit in fig. 1 and 2 has two outdoor units, and one of the outdoor units is the first type outdoor unit 11, and the other outdoor unit is the second type outdoor unit 12. It should be noted that one of the two outdoor units is the first-type outdoor unit 11, and the other is the second-type outdoor unit 12, which are only used for explaining the logic and the principle of the control method of the present invention, and do not mean that the first-type outdoor unit is always present in the actual operation process of the multi-split air conditioning unit, nor mean that one of the two outdoor units is always the first-type outdoor unit, specifically, whether the first-type outdoor unit or the second-type outdoor unit is determined based on the actual discharge temperature of the outdoor unit and the preset lowest discharge temperature warning value, that is, when the actual discharge temperature of the outdoor unit is not lower than the lowest discharge temperature warning value, the outdoor unit is the first-type outdoor unit, and when the actual discharge temperature of the outdoor unit is lower.
The minimum exhaust temperature warning value in this embodiment represents an exhaust temperature value when the compressor 21 exceeds a normal exhaust temperature range and its own working efficiency is affected, and the minimum exhaust temperature warning value has a certain difference for different types of refrigerants or different models of compressors 21, for example, for a certain type of compressor 21, the minimum exhaust temperature warning value is 95 ℃. At this time, when the actual discharge temperature of the compressor 21 is greater than or equal to 95 ℃, the outdoor unit is the first type outdoor unit 11; when the actual discharge temperature of the compressor 21 is less than 95 ℃, the outdoor unit is the second type of outdoor unit 12. For another example, in the following description of the present embodiment, the first exhaust temperature threshold may be 105 ℃, the second exhaust temperature threshold may be 113 ℃, and the maximum exhaust temperature warning value may be 120 ℃.
In addition, during the adjustment of the superheat degree or the frequency of the compressor 21, the adjustment can be performed in a gradient manner, for example, when the superheat degree is changed by 1 ℃ or the compressor is reduced by 5Hz, the adjustment effect is delayed for 10-15 seconds, and then the adjustment is continued. To ensure that the actual discharge temperature of the compressor 21 after an adjustment operation is monitored and the next adjustment is made based on the actual discharge temperature of the compressor 21.
Since the method for controlling the multi-split air conditioning unit according to this embodiment is to solve the problem that the operation capacity of the multi-split air conditioning unit cannot be fully exerted due to a large difference in the operation states of the outdoor units caused by uneven refrigerant distribution, the method is only applied when the multi-split air conditioning unit satisfies a condition that the number of the first type outdoor units 11 and the number of the second type outdoor units 12 are both not zero.
According to the control method of the multi-split air conditioning unit of the embodiment, when the number of the first-type outdoor units 11 of which the actual exhaust temperatures are greater than or equal to the preset lowest exhaust temperature early warning value and the number of the second-type outdoor units 12 of which the actual exhaust temperatures are less than the preset lowest exhaust temperature early warning value are not zero, the opening degrees of the main electronic expansion valves of the first-type outdoor units 11, the opening degrees of the economizer electronic expansion valves 26 of the first-type outdoor units 11, the opening degrees of the main electronic expansion valves of the indoor units 3 and the frequency of the compressors 21 of the second-type outdoor units 12 are selectively adjusted according to the actual exhaust temperatures of all the first-type outdoor units 11, and/or the multi-split air conditioning unit is stopped by. Therefore, when the operating states of the outdoor units are greatly different due to uneven refrigerant distribution, the multi-split air conditioning unit can be comprehensively controlled by a method with steps in stages, so that the outdoor units work in a coordinated mode, and the overall working capacity of the multi-split air conditioning unit is fully exerted.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
As a preferred embodiment of the above control method provided in this embodiment, the step of "selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units 11" in step S3 includes:
s31, if the actual discharge temperature of the outdoor unit 11 of the first type is less than a first discharge temperature threshold, adjusting the opening of the electronic expansion valve 26 of the economizer of the outdoor unit 11 of the first type, wherein the first discharge temperature threshold is greater than a preset lowest discharge temperature warning value.
For example, when the multi-split air conditioning unit is in a cooling operation, as shown in fig. 1, the outdoor heat exchanger 23 serves as a condenser, the indoor heat exchanger 31 serves as an evaporator, and during the adjustment process of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, a refrigerant flows out of the first channel of the economizer 25, and then part of the refrigerant enters the second channel of the economizer 25 through the economizer electronic expansion valve 26, and at this time, the refrigerant is evaporated in the second channel of the economizer 25 and absorbs heat of the refrigerant in the first channel, so that the refrigerant is secondarily condensed before entering the indoor heat exchanger 31, and the cooling effect of the indoor heat exchanger 31 is improved, and at the same time, the suction volume of the compressor 21 of the first-type outdoor unit 11 can be increased, the suction temperature of the compressor 21 of the first-type outdoor unit 11 is reduced, and the operating condition of the first-type. The opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11 is adjusted to reduce the discharge temperature of the first-type compressor 21 to be lower than the minimum discharge temperature warning value, so that the outdoor units can be in a normal and efficient working state.
It is understood that the degree of superheat that can be achieved by the economizer 25 while exerting its maximum capacity may be the first target degree of superheat depending on the type of refrigerant or the performance of the economizer 25 itself. During adjustment of the opening degree of the economizer electronic expansion valve 26, the superheat of the second passage of the economizer 25 gradually approaches the first target superheat. The difference between the refrigerant temperatures at the outlet and the inlet of the second channel of the economizer 25 can be used as an approximate value of the supercooling degree of the economizer 25.
According to the control method of the multi-split air conditioning unit of the present invention, if the actual discharge temperature of the first outdoor unit 11 is less than the first discharge temperature threshold, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11 is adjusted. Thus, when the multi-split air conditioning unit starts to be adjusted, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11 is adjusted, and then when the adjustment effect cannot be achieved by adjusting the first outdoor unit 11, the next adjustment measure is taken, so that the influence on other outdoor units is reduced to the greatest extent while the normal working state of the first outdoor unit 11 is realized.
As a preferred embodiment of the above control method provided in this embodiment, the step of "selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units 11" in step S3 further includes:
s32, if the actual discharge temperature of the outdoor unit 11 of the first type is greater than or equal to the first discharge temperature threshold and less than the second discharge temperature threshold, keeping the superheat degree of the economizer 25 of the outdoor unit 11 of the first type at the first target superheat degree; and adjusting the opening degree of the main electronic expansion valves of the indoor units 3 when the multi-split air conditioning unit operates in a refrigerating mode; and adjusting the opening degree of the main electronic expansion valve of the first type outdoor unit 11 during heating operation of the multi-split air conditioning unit.
Illustratively, when the multi-split air conditioning unit is adjusted in the method of step S31, if the discharge temperature of the compressor 21 of the first type outdoor unit 11 continues to rise, the control method of step S32 is performed. Since the indoor heat exchanger 31 serves as an evaporator during cooling operation of the multi-split air conditioning unit and the outdoor heat exchanger 23 serves as an evaporator during heating operation of the multi-split air conditioning unit, the degree of superheat of the evaporator is adjusted under both conditions. When the superheat degree is equal to zero, it indicates that there is no working effect of the evaporator, and when the superheat degree is adjusted according to the method in step S32, the difference between the refrigerant temperatures at the outlet and the inlet of the indoor heat exchanger 31 may be taken as an approximate value of the superheat degree, and meanwhile, a second target superheat degree may be preset as a superheat degree value in an optimal condition, and 1 ℃ may be set as a gradient target during adjustment, and gradually changed to the second target superheat degree according to the adjustment effect.
As a preferred embodiment of the above control method provided in this embodiment, the step of "selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units 11" in step S3 further includes:
s33, if the actual discharge temperature of the first type outdoor unit 11 is greater than or equal to the second discharge temperature threshold and less than the preset maximum discharge temperature warning value, keeping the superheat degree of the economizer 25 of the first type outdoor unit 11 at the first target superheat degree and reducing the operating frequency of the compressor 21 of the second type outdoor unit 12; adjusting the superheat degree of the indoor heat exchangers 31 of the indoor units 3 to a second target superheat degree during the refrigeration operation of the multi-split air conditioning unit; and adjusting the superheat degree of the outdoor heat exchanger 23 of the first type outdoor unit 11 to a third target superheat degree during heating operation of the multi-split air conditioning unit.
For example, after the adjustment by the methods of steps S31 and S32, if the actual discharge temperature of the first type outdoor unit 11 continues to increase, the operation frequency of the compressor 21 of the second type outdoor unit 12 is continuously decreased to decrease the discharge temperature of the first type compressor 21, while the previous optimum adjustment effect is maintained.
As a preferred embodiment of the above control method provided in this embodiment, the step of "selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units 11" in step S3 further includes:
and S34, if the actual exhaust temperature of the outdoor unit 11 of the first type is greater than or equal to the preset maximum exhaust temperature early warning value, the multi-split air conditioner unit is stopped by alarming. It can be understood that all the adjustment measures are used up at this time, the discharge temperature of the compressor 21 of the first type outdoor unit 11 is still not reduced to a good effect, and in order to prevent the compressor 21 of the first type outdoor unit 11 from being damaged, the outdoor unit can be turned off and other compressors 21 are started up, or the whole multi-split air conditioning unit is stopped by alarm.
It should be understood by those skilled in the art that the control method of the multi-split air conditioning unit provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Then, this embodiment further provides a control system of a multi-split air conditioning unit, where the control system corresponds to the control method of the multi-split air conditioning unit described above, and details of implementation refer to the above description, which is not repeated herein. The multi-split air conditioning unit comprises a plurality of outdoor units and a plurality of indoor units 3 which are connected through refrigerant pipelines, and a control system comprises an acquisition module, a calculation module and an execution module; the acquisition module is used for acquiring the actual exhaust temperature of the compressors 21 of all the outdoor units; the calculation module is used for calculating the number of the first-type outdoor units 11 of which the actual discharge temperature is greater than or equal to the preset lowest discharge temperature early warning value and the number of the second-type outdoor units 12 of which the actual discharge temperature is less than the preset lowest discharge temperature early warning value; when the number of the first-type outdoor units 11 and the number of the second-type outdoor units 12 are not zero, the execution module is configured to selectively adjust the opening degree of the main electronic expansion valve of the first-type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, the opening degrees of the main electronic expansion valves of the plurality of indoor units 3, the frequency of the compressor 21 of the second-type outdoor unit 12, and/or cause the multi-split air conditioning unit to stop alarming according to the actual discharge temperature of all the first-type outdoor units 11.
As a preferred embodiment of the above control system provided in this embodiment, the "executing module is configured to selectively adjust the opening degree of the main electronic expansion valve of the first-type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second-type outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first-type outdoor units 11" includes: if the actual discharge temperature of the outdoor unit 11 of the first type is less than a first discharge temperature threshold, the execution module is configured to adjust an opening degree of the economizer electronic expansion valve 26 of the outdoor unit 11 of the first type, where the first discharge temperature threshold is greater than a preset lowest discharge temperature warning value.
As a preferred embodiment of the above control system provided in this embodiment, the "executing module is configured to selectively adjust the opening degree of the main electronic expansion valve of the first-type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second-type outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first-type outdoor units 11" further includes: if the actual discharge temperature of the first type outdoor unit 11 is greater than or equal to the first discharge temperature threshold and less than the second discharge temperature threshold, the execution module is configured to maintain the superheat degree of the economizer 25 of the first type outdoor unit 11 as the first target superheat degree; the execution module is used for adjusting the opening degree of the main electronic expansion valve of the indoor units 3 when the multi-split air conditioning unit operates in a refrigerating mode; the execution module is used for adjusting the opening of the main electronic expansion valve of the first type outdoor unit 11 when the multi-split air conditioning unit is in heating operation.
As a preferred embodiment of the above control system provided in this embodiment, the "executing module is configured to selectively adjust the opening degree of the main electronic expansion valve of the first-type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second-type outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first-type outdoor units 11" further includes: if the actual discharge temperature of the first type outdoor unit 11 is greater than or equal to the second discharge temperature threshold and less than the preset maximum discharge temperature warning value, the execution module is configured to keep the superheat degree of the economizer 25 of the first type outdoor unit 11 as the first target superheat degree and reduce the operating frequency of the compressor 21 of the second type outdoor unit 12; the execution module is used for adjusting the superheat degree of the indoor heat exchangers 31 of the indoor units 3 to a second target superheat degree during the refrigeration operation of the multi-split air conditioning unit; the execution module is used for adjusting the superheat degree of the outdoor heat exchanger 23 of the first type outdoor unit 11 to a third target superheat degree during heating operation of the multi-split air conditioning unit.
As a preferred embodiment of the above control system provided in this embodiment, the "executing module is configured to selectively adjust the opening degree of the main electronic expansion valve of the first-type outdoor unit 11, the opening degree of the economizer electronic expansion valve 26 of the first-type outdoor unit 11, the opening degrees of the main electronic expansion valves of the indoor units 3, the frequency of the compressor 21 of the second-type outdoor unit 12, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first-type outdoor units 11" further includes: and if the actual exhaust temperature of the first type outdoor unit 11 is greater than or equal to the preset maximum exhaust temperature early warning value, the execution module is used for enabling the multi-split air conditioning unit to alarm and shut down.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be noted that, the control system of the multi-split air conditioning unit provided in the foregoing embodiment is only illustrated by dividing the functional units (such as the operating state obtaining module, the calculating module, the executing module, and the like), and in practical applications, the functional modules may be completed by different functional modules according to needs, that is, the functional modules in the embodiment of the present invention are further decomposed or combined, for example, the functional units in the foregoing embodiment may be combined into one functional module, or may be further split into multiple sub-modules, so as to complete all or part of the functions described above. The names of the function modules related to the embodiments of the present invention are only for distinguishing and are not to be construed as an improper limitation of the present invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of a multi-split air conditioning unit comprises a plurality of outdoor units and a plurality of indoor units which are connected through refrigerant pipelines, and is characterized by comprising the following steps:
acquiring actual exhaust temperatures of all the compressors of the outdoor unit;
calculating the number of the first-class outdoor units of which the actual discharge temperatures are greater than or equal to a preset lowest discharge temperature early warning value and the number of the second-class outdoor units of which the actual discharge temperatures are less than the preset lowest discharge temperature early warning value;
when the number of the first type outdoor units and the number of the second type outdoor units are not zero, selectively adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor units, the opening degree of an economizer electronic expansion valve of the first type outdoor units, the opening degrees of main circuit electronic expansion valves of the indoor units, the frequency of a compressor of the second type outdoor units and/or enabling the multi-split air conditioner unit to alarm and stop according to the actual exhaust temperature of all the first type outdoor units.
2. The control method according to claim 1, wherein the step of selectively adjusting the opening degree of the main electronic expansion valve of the first type outdoor unit, the opening degree of the economizer electronic expansion valve of the first type outdoor unit, the opening degree of the main electronic expansion valve of the indoor units, the frequency of the compressor of the second type outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperature of all the first type outdoor units comprises:
adjusting an opening degree of an economizer electronic expansion valve of the first type outdoor unit if the actual discharge temperature of the first type outdoor unit is less than a first discharge temperature threshold value,
and the first exhaust temperature threshold value is greater than the preset lowest exhaust temperature early warning value.
3. The control method according to claim 2, wherein the step of selectively adjusting an opening degree of a main electronic expansion valve of the first-type outdoor unit, an opening degree of an economizer electronic expansion valve of the first-type outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second-type outdoor unit, and/or an alarm stop of the multi-split air conditioning unit according to the actual discharge temperature of all the first-type outdoor units further comprises:
if the actual discharge temperature of the first type outdoor unit is greater than or equal to the first discharge temperature threshold and less than a second discharge temperature threshold, keeping the superheat degree of an economizer of the first type outdoor unit at a first target superheat degree; and
adjusting the opening degree of main circuit electronic expansion valves of the indoor units when the multi-split air conditioning unit operates in a refrigerating mode;
and adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor unit when the multi-split air conditioning unit is in heating operation.
4. The control method according to claim 3, wherein the step of selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degrees of the main electronic expansion valves of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units further comprises:
if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the second discharge temperature threshold value and less than a preset maximum discharge temperature early warning value, keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree and reducing the operating frequency of a compressor of the second type of outdoor unit; and
adjusting the superheat degree of indoor heat exchangers of the indoor units to a second target superheat degree when the multi-split air conditioning unit operates in a refrigerating mode;
and adjusting the superheat degree of the outdoor heat exchanger of the first type of outdoor unit to a third target superheat degree during heating operation of the multi-split air conditioning unit.
5. The control method according to claim 4, wherein the step of selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degrees of the main electronic expansion valves of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperatures of all the first outdoor units further comprises:
and if the actual exhaust temperature of the first type of outdoor unit is greater than or equal to the preset maximum exhaust temperature early warning value, the multi-split air conditioning unit is stopped by alarming.
6. A control system of a multi-split air conditioning unit comprises a plurality of outdoor units and a plurality of indoor units which are connected through refrigerant pipelines, and is characterized by comprising an acquisition module, a calculation module and an execution module;
the acquisition module is used for acquiring the actual exhaust temperature of the compressors of all the outdoor units;
the calculation module is used for calculating the number of the first type outdoor units of which the actual discharge temperatures are greater than or equal to a preset lowest discharge temperature early warning value and the number of the second type outdoor units of which the actual discharge temperatures are less than the preset lowest discharge temperature early warning value;
when the number of the first type outdoor units and the number of the second type outdoor units are not zero, the execution module is used for selectively adjusting the opening degree of a main circuit electronic expansion valve of the first type outdoor unit, the opening degree of an economizer electronic expansion valve of the first type outdoor unit, the opening degrees of main circuit electronic expansion valves of the indoor units, the frequency of a compressor of the second type outdoor unit and/or enabling the multi-split air conditioner unit to stop alarming according to the actual exhaust temperature of all the first type outdoor units.
7. The control system of claim 6, wherein the execution module is configured to selectively adjust an opening degree of a main electronic expansion valve of the first outdoor unit, an opening degree of an economizer electronic expansion valve of the first outdoor unit, an opening degree of a main electronic expansion valve of the indoor units, a frequency of a compressor of the second outdoor unit, and/or an alarm stop of the multi-split air conditioner set according to the actual discharge temperature of all the first outdoor units comprises:
if the actual exhaust temperature of the first type outdoor unit is less than a first exhaust temperature threshold value, the execution module is used for adjusting the opening degree of an electronic expansion valve of an economizer of the first type outdoor unit, wherein the first exhaust temperature threshold value is greater than the preset lowest exhaust temperature early warning value.
8. The control system of claim 7, wherein the execution module for selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degree of the main electronic expansion valve of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperature of all the first outdoor units further comprises:
if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the first discharge temperature threshold and less than a second discharge temperature threshold, the execution module is used for keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree; and
the execution module is used for adjusting the opening degree of a main electronic expansion valve of the indoor units when the multi-split air conditioning unit operates in a refrigerating mode;
the execution module is used for adjusting the opening degree of a main electronic expansion valve of the first type of outdoor unit when the multi-split air conditioning unit is in heating operation.
9. The control system of claim 8, wherein the execution module for selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degree of the main electronic expansion valve of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperature of all the first outdoor units further comprises:
if the actual discharge temperature of the first type of outdoor unit is greater than or equal to the second discharge temperature threshold and less than a preset maximum discharge temperature early warning value, the execution module is used for keeping the superheat degree of an economizer of the first type of outdoor unit as a first target superheat degree and reducing the operating frequency of a compressor of the second type of outdoor unit; and
the execution module is used for adjusting the superheat degree of the indoor heat exchangers of the indoor units to a second target superheat degree when the multi-split air conditioning unit operates in a refrigerating mode;
the execution module is used for adjusting the superheat degree of the outdoor heat exchanger of the first type of outdoor unit to a third target superheat degree during heating operation of the multi-split air conditioning unit.
10. The control system of claim 9, wherein the execution module for selectively adjusting the opening degree of the main electronic expansion valve of the first outdoor unit, the opening degree of the economizer electronic expansion valve of the first outdoor unit, the opening degree of the main electronic expansion valve of the indoor units, the frequency of the compressor of the second outdoor unit, and/or the warning shutdown of the multi-split air conditioning unit according to the actual discharge temperature of all the first outdoor units further comprises:
and if the actual exhaust temperature of the first type of outdoor unit is greater than or equal to the preset maximum exhaust temperature early warning value, the execution module is used for enabling the multi-split air conditioning unit to alarm and stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675695.9A CN111928419B (en) | 2020-07-14 | 2020-07-14 | Control method and system for multi-split air conditioning unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675695.9A CN111928419B (en) | 2020-07-14 | 2020-07-14 | Control method and system for multi-split air conditioning unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111928419A true CN111928419A (en) | 2020-11-13 |
| CN111928419B CN111928419B (en) | 2023-03-31 |
Family
ID=73312907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010675695.9A Active CN111928419B (en) | 2020-07-14 | 2020-07-14 | Control method and system for multi-split air conditioning unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111928419B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460831A (en) * | 2020-11-16 | 2021-03-09 | 浙江中广电器股份有限公司 | Exhaust temperature control method, controller and air energy heat pump unit |
| CN112984621A (en) * | 2021-04-01 | 2021-06-18 | 广东积微科技有限公司 | Control method for exhaust superheat degree of parallel multi-split air conditioner |
| CN113188230A (en) * | 2021-04-16 | 2021-07-30 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN113291128A (en) * | 2021-04-29 | 2021-08-24 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
| CN115523599A (en) * | 2022-08-30 | 2022-12-27 | 宁波奥克斯电气股份有限公司 | Control method and control device of multi-connected air conditioner, air conditioner and storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455197A (en) * | 2002-04-29 | 2003-11-12 | 三星电子株式会社 | Multiple machine-group air conditioner |
| CN104729025A (en) * | 2015-04-09 | 2015-06-24 | 宁波奥克斯电气有限公司 | Dynamic refrigerant balance control method in refrigerating process of multi-connected air-conditioner unit |
| JP2015148387A (en) * | 2014-02-06 | 2015-08-20 | 株式会社富士通ゼネラル | Air conditioning device |
| WO2017017767A1 (en) * | 2015-07-27 | 2017-02-02 | 三菱電機株式会社 | Air conditioning device |
| CN107461896A (en) * | 2017-09-18 | 2017-12-12 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107477934A (en) * | 2017-09-18 | 2017-12-15 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN111023270A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Control method and device of electronic expansion valve, air conditioner and storage medium |
-
2020
- 2020-07-14 CN CN202010675695.9A patent/CN111928419B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455197A (en) * | 2002-04-29 | 2003-11-12 | 三星电子株式会社 | Multiple machine-group air conditioner |
| JP2015148387A (en) * | 2014-02-06 | 2015-08-20 | 株式会社富士通ゼネラル | Air conditioning device |
| CN104729025A (en) * | 2015-04-09 | 2015-06-24 | 宁波奥克斯电气有限公司 | Dynamic refrigerant balance control method in refrigerating process of multi-connected air-conditioner unit |
| WO2017017767A1 (en) * | 2015-07-27 | 2017-02-02 | 三菱電機株式会社 | Air conditioning device |
| CN107461896A (en) * | 2017-09-18 | 2017-12-12 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN107477934A (en) * | 2017-09-18 | 2017-12-15 | 广东美的暖通设备有限公司 | Control method, system and the computer-readable recording medium of multi-connected air conditioner |
| CN111023270A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Control method and device of electronic expansion valve, air conditioner and storage medium |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460831A (en) * | 2020-11-16 | 2021-03-09 | 浙江中广电器股份有限公司 | Exhaust temperature control method, controller and air energy heat pump unit |
| CN112460831B (en) * | 2020-11-16 | 2022-02-11 | 浙江中广电器股份有限公司 | Exhaust temperature control method, controller and air energy heat pump unit |
| CN112984621A (en) * | 2021-04-01 | 2021-06-18 | 广东积微科技有限公司 | Control method for exhaust superheat degree of parallel multi-split air conditioner |
| CN113188230A (en) * | 2021-04-16 | 2021-07-30 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN113188230B (en) * | 2021-04-16 | 2022-06-28 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner |
| CN113291128A (en) * | 2021-04-29 | 2021-08-24 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
| CN113291128B (en) * | 2021-04-29 | 2022-05-03 | 东风柳州汽车有限公司 | Integrated power battery cooling system, cooling control method and electric automobile |
| CN115523599A (en) * | 2022-08-30 | 2022-12-27 | 宁波奥克斯电气股份有限公司 | Control method and control device of multi-connected air conditioner, air conditioner and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111928419B (en) | 2023-03-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111928419B (en) | Control method and system for multi-split air conditioning unit | |
| CN109631377B (en) | Evaporation cooling type water chilling unit heat exchange system and control method thereof | |
| EP3059521B1 (en) | Air conditioning device | |
| US9163864B2 (en) | Air-conditioning apparatus with oil return in a transcritical cycle | |
| CN104729033B (en) | The antifreeze method and apparatus of the handpiece Water Chilling Units of air-conditioner set | |
| JP5639984B2 (en) | Air conditioner | |
| WO2013145006A1 (en) | Air conditioning device | |
| KR100248683B1 (en) | Cooling apparatus | |
| EP1666813A1 (en) | Multi-type air conditioner and method to distribute oil uniformly | |
| CN107477798B (en) | method and device for controlling refrigerant of air conditioner and air conditioner | |
| CN113405243A (en) | Control method of air conditioning system | |
| CN109869941B (en) | Heat pump system, air suction superheat degree and vapor-liquid separator accumulated liquid evaporation control method | |
| KR20080084735A (en) | Refrigeration cycle apparatus | |
| CN112797587B (en) | Air conditioner control method and air conditioner system | |
| EP3267130B1 (en) | Refrigeration cycle device | |
| CN111425977A (en) | Multi-connected heat pipe precision air conditioner | |
| JP5927670B2 (en) | Air conditioner | |
| KR20210100461A (en) | Air conditioning apparatus | |
| KR100822432B1 (en) | Air conditioner having auxiliary exchanger | |
| US20240093921A1 (en) | Cooling system with flooded low side heat exchangers | |
| CN106594964A (en) | Control method for controlling operation of air conditioner system and air conditioner system | |
| KR20210096521A (en) | Air conditioning apparatus | |
| JP2011027314A (en) | Air conditioner | |
| KR101692243B1 (en) | Heat pump with cascade refrigerating cycle | |
| KR20190005052A (en) | Method for controlling multi-type air conditioner |
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 |