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CN109469604B - Heat exchange equipment with multistage energy efficiency point compressor and control method thereof - Google Patents

Heat exchange equipment with multistage energy efficiency point compressor and control method thereof Download PDF

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Publication number
CN109469604B
CN109469604B CN201811171913.4A CN201811171913A CN109469604B CN 109469604 B CN109469604 B CN 109469604B CN 201811171913 A CN201811171913 A CN 201811171913A CN 109469604 B CN109469604 B CN 109469604B
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China
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mode
compressor
cylinder
current
cylinder mode
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CN109469604A (en
Inventor
彭光前
吴俊鸿
车雯
王现林
谭建明
翟振坤
廖敏
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/005—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders with two cylinders
    • 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
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/86—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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air

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

Abstract

The invention provides heat exchange equipment with a multistage energy efficiency point compressor and a control method thereof, and belongs to the technical field of heat exchange equipment. The compressor comprises two compression cylinder bodies and a terminal winding circuit capable of switching star connection and triangular connection; the controller of the heat exchange equipment is used for acquiring the current cylinder mode and the current operating frequency of the compressor, and the cylinder mode comprises a single-cylinder mode or a double-cylinder mode; switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from the current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring mode including a star wiring mode or a delta wiring mode. The heat exchange equipment provided by the invention can adopt a mode of combining single-cylinder and double-cylinder mode switching and star-shaped and triangular wiring mode switching according to the running state of the compressor, can adapt to a wider load range in the running process of the compressor, and can run in a more energy-saving mode.

Description

Heat exchange equipment with multistage energy efficiency point compressor and control method thereof
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to heat exchange equipment with a multistage energy efficiency point compressor and a control method thereof.
Background
Nowadays, environmental protection and energy conservation are increasingly pursued, and the amount of power consumption of electric products is an important reference index for users to purchase the electric products. The compressor is used as a common driving device of the current electric products, and the power consumption of the electric products can be directly influenced by the operation energy efficiency.
For existing compressor products, there is typically an operating point at which optimum energy efficiency can be achieved. For example, a common single-cylinder compressor has an optimal energy efficiency operating point, when the single-cylinder compressor operates at the optimal energy efficiency operating point, the operating energy efficiency is high, the power consumption is low, but the load interval of the single-cylinder compressor satisfying the operation at the optimal energy efficiency operating point is relatively small; compared with the prior art, the double-cylinder variable-capacity compressor has high compression efficiency, can meet the requirements of low load and high load by adopting a double-cylinder variable-capacity technology, and is inconvenient to switch and adjust due to the fact that the intermediate span of the optimal energy efficiency points corresponding to the two loads is large when the compressor is changed between high load and low load. In conclusion, the energy efficiency point adjusting mode of the single-cylinder compressor or the double-cylinder variable-capacity compressor cannot cover the requirement of the full working condition.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a heat exchange device with a multi-stage energy efficiency point compressor and a control method thereof, so as to solve the problem of how to adjust the working mode of the compressor to achieve the optimal energy efficiency point.
In order to solve the above problems, according to a first aspect of the present invention, there is provided a heat exchange device having a multi-stage energy efficient point compressor, wherein,
the compressor comprises a machine body, wherein the machine body is provided with two compression cylinder bodies and a terminal winding circuit capable of switching star connection and triangular connection;
the heat exchange equipment also comprises a controller, a controller and a controller, wherein the controller is used for acquiring the current cylinder mode and the current operating frequency of the compressor, and the cylinder mode comprises a single-cylinder mode or a double-cylinder mode; and the number of the first and second groups,
switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from the current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring mode including a star wiring mode or a delta wiring mode.
As an alternative embodiment, the controller is further configured to:
determining the load grade when the compressor is started;
an initial cylinder mode of the compressor is determined based on a load level when the compressor is turned on.
As an optional implementation manner, the heat exchange device further includes one or more sensors, which are configured to acquire state parameters when the air conditioner is started, where the state parameters include one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user;
the controller is specifically configured to: and judging the load grade of the compressor when the compressor is started based on the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
As an alternative embodiment, the controller has means for:
if the load grade when the compressor is started is the set low-load grade, determining that the initial cylinder mode of the compressor is the single-cylinder mode;
and if the load grade when the compressor is started is the set high load grade, determining that the initial cylinder mode of the compressor is the double-cylinder mode.
As an optional implementation, the controller is specifically configured to:
comparing the current operating frequency and the target operating frequency of the compressor with preset frequency thresholds respectively; the frequency threshold is associated with a current cylinder mode and a current wire mode;
determining a target cylinder block mode and a target wiring mode based on a first comparison result of the current operating frequency of the compressor and a preset frequency threshold and a second comparison result of the target operating frequency of the compressor and the preset frequency threshold;
and switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
According to the second aspect of the present invention, there is also provided a control method of a refrigeration apparatus having a multi-stage energy efficient point compressor, the control method including:
acquiring a current cylinder mode and a current operating frequency of the compressor, wherein the cylinder mode comprises a single-cylinder mode or a double-cylinder mode;
switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from the current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring mode including a star wiring mode or a delta wiring mode.
As an optional implementation, the control method further includes:
determining the load grade when the compressor is started;
an initial cylinder mode of the compressor is determined based on a load level when the compressor is turned on.
As an alternative embodiment, determining the load level at the time of starting the compressor includes:
acquiring state parameters when the air conditioner is started, wherein the state parameters comprise one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user;
and judging the load grade of the compressor when the compressor is started based on the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
As an alternative embodiment, the determining the initial cylinder mode of the compressor based on the load level when the compressor is started comprises:
if the load grade when the compressor is started is the set low-load grade, determining that the initial cylinder mode of the compressor is the single-cylinder mode;
and if the load grade when the compressor is started is the set high load grade, determining that the initial cylinder mode of the compressor is the double-cylinder mode.
As an alternative embodiment, switching the compressor from the current cylinder mode to the corresponding target cylinder mode and from the current wiring mode to the corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor includes:
comparing the current operating frequency and the target operating frequency of the compressor with preset frequency thresholds respectively; the frequency threshold is associated with a current cylinder mode and a current wire mode;
determining a target cylinder block mode and a target wiring mode based on a first comparison result of the current operating frequency of the compressor and a preset frequency threshold and a second comparison result of the target operating frequency of the compressor and the preset frequency threshold;
and switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
The heat exchange equipment provided by the invention can realize the switching operation of at least 4 optimal energy efficiency points by adopting a mode of combining single-double cylinder mode switching and star-shaped and triangular wiring mode switching according to the running state of the compressor, so that the compressor can adapt to a wider load range in the running process and can run in a more energy-saving mode.
Drawings
FIG. 1 is a schematic diagram of a multi-stage energy efficient compressor according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a control method of a heat exchange device according to an embodiment of the present invention;
FIG. 3 is a graph illustrating multi-stage energy efficiency points for a compressor according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a control method of a heat exchange device according to another embodiment of the present invention.
The reference numerals are represented as:
1. a body; 2. compressing the cylinder body; 3. and a terminal winding.
Detailed Description
Fig. 1 is a schematic diagram of the multi-stage energy efficient compressor of the present invention according to an exemplary embodiment.
As shown in fig. 1, the present invention provides a heat exchange device with a multi-stage energy efficient point compressor, including but not limited to air conditioners, refrigerators, etc.; the compressor comprises a machine body 1, wherein the machine body 1 is provided with two compression cylinder bodies 2, and the two compression cylinder bodies 2 of the compressor have two working modes of a single-cylinder mode and a double-cylinder mode, wherein the single-cylinder working mode is that only one of the two compression cylinder bodies 2 is started to perform compression operation, and at the moment, the other compression cylinder body 2 which is not started does not perform compression operation; the double-cylinder mode is to start two compression cylinders 2 to respectively compress the refrigerant.
Each compression cylinder 2 and the connection form of the two compression cylinders 2 can refer to a dual-cylinder compressor disclosed in the prior art, and are not described herein.
The compressor further includes a terminal winding 3 circuit constituted by the terminal windings 3, including a plurality of a terminal windings 3 and B terminal windings 3, and switching between star connection and delta connection is possible between the plurality of terminal windings 3.
The circuit connection form of the terminal winding 3 circuit and the switching between the star connection and the delta connection can refer to the compressor products with related structures disclosed in the prior art, and are not described in detail herein.
Here, the heat exchange device of the present invention further comprises a controller (not shown in the drawings), the controller being operable to:
acquiring a current cylinder mode and a current operating frequency of the compressor; cylinder modes include the single cylinder mode or the two cylinder mode disclosed hereinbefore; and the number of the first and second groups,
switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from the current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring mode including a star wiring mode or a delta wiring mode.
Here, the target cylinder mode may be the same cylinder mode as the current cylinder mode, and if the current cylinder mode is the single cylinder mode and the determined target cylinder mode is also the single cylinder mode, the specific operation of the controller to switch the compressor from the current cylinder mode to the corresponding target cylinder mode is not to be performed, that is, the current cylinder mode is maintained unchanged; or, the target cylinder mode is a cylinder mode different from the current cylinder mode, and if the current cylinder mode is the single-cylinder mode and the determined target cylinder mode is the double-cylinder mode, the specific operation of the controller to switch the compressor from the current cylinder mode to the corresponding target cylinder mode is to switch the compressor from the single-cylinder mode to the double-cylinder mode.
The target connection mode may be the same connection mode as the current connection mode, and if the current connection mode is a star connection mode and the determined target connection mode is also the star connection mode, the specific operation of the controller for switching the compressor from the current connection mode to the corresponding target connection mode is inactive, that is, the current connection mode is maintained unchanged; alternatively, the target wiring mode is a wiring mode different from the current wiring mode, and if the current wiring mode is a star wiring mode and the determined target wiring mode is a delta wiring mode, the specific operation of the controller to switch the compressor from the current wiring mode to the corresponding target wiring mode is to switch the compressor from the star wiring mode to the delta wiring mode.
As an alternative embodiment, in order to adapt to different loads when the air conditioner is started, the controller is further configured to: determining the load grade when the compressor is started; an initial cylinder mode of the compressor is determined based on a load level when the compressor is turned on.
In this embodiment, the load level when the air conditioner is turned on is divided into a low load level and a high load level, and the load value corresponding to the high load level is greater than the load value of the low load level.
Specifically, the specific process of the controller determining the load level when the compressor is started may include: acquiring state parameters when the air conditioner is started, wherein the state parameters include but are not limited to one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user; and judging the load grade of the compressor when the compressor is started based on the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
In this embodiment, the heat exchange device further comprises one or more sensors, and the one or more controllers are configured to detect the state parameters; one or more sensors are in communication with the controller and send the status parameters detected by the one or more sensors to the controller.
Illustratively, the acquired state parameter of the air conditioner when being started is a target temperature T set by a userTarget temperatureAnd outdoor ambient temperature TOuter ring temperature；
Here, the target temperature T set by the userTarget temperatureThe instruction signal input by the user can be directly obtained by analyzing the heat exchange equipment according to the instruction information input by the user; the outdoor unit is provided with an outdoor temperature sensor for detecting outdoor environment temperature TOuter ring temperature；
When the current heat exchange mode of the air conditioner is the cooling mode, if T isTarget temperature of refrigerationGreater than TOuter ring temperatureJudging the load grade when the compressor is started to be a low-load grade; if T isTarget temperature of refrigerationLess than or equal to TOuter ring temperatureAnd judging the load grade when the compressor is started to be a high load grade.
For example, when the air conditioner operates in a cooling mode, the target cooling temperature T set by a userTarget temperature of refrigerationAt 24 deg.C if the detected outdoor ambient temperature T isOuter ring temperatureIf the temperature value is less than 24 ℃, such as 21 ℃, 23 ℃ and the like, the load grade when the compressor is started is judged to be a low-load grade; if the detected outdoor environment temperature TOuter ring temperatureAnd if the temperature is higher than or equal to 24 ℃, such as 24 ℃ and 28 ℃, the load grade when the compressor is started is judged to be a high load grade.
If T is the heating mode when the current heat exchange mode of the air conditioner is the heating modeTarget temperature of heatingLess than TOuter ring temperatureJudging the load grade when the compressor is started to be a low-load grade; if T isTarget temperature of heatingGreater than or equal to TOuter ring temperatureAnd judging the load grade when the compressor is started to be a high load grade.
For example, when the air conditioner operates in a cooling mode, the target heating temperature T set by the userTarget temperature of heatingAt 18 deg.C if the detected outdoor ambient temperature T isOuter ring temperatureThe temperature is greater than or equal to 18 deg.C, such as 19 deg.C, 21 deg.C, etc., and the load grade when the compressor is started is determined to beA low load level; if the detected outdoor environment temperature TOuter ring temperatureIf the temperature is lower than 18 ℃, for example, 5 ℃, 0 ℃, etc., the load grade when the compressor is started is judged to be a high load grade.
After determining the load level at the time of starting the compressor, the controller determines an initial cylinder mode of the compressor based on the load level at the time of starting the compressor, including:
if the load grade when the compressor is started is the set low-load grade, determining that the initial cylinder mode of the compressor is the single-cylinder mode; at the moment, the compressor of the heat exchange equipment is started to operate in a single-cylinder mode;
if the load grade of the compressor during starting is a set high load grade, determining that the initial cylinder mode of the compressor is a double-cylinder mode; at the moment, a compressor of the heat exchange equipment is started to operate in a double-cylinder mode;
it should be understood that the initial cylinder mode determining process of the compressor by the controller can be determined after the heat exchange device is started and before the compressor is started, so that the compressor can be operated in the cylinder mode matched with the current load working condition, and the starting of the compressor can be more stable and energy-saving.
The controller is configured to switch the compressor from the current cylinder mode to the corresponding target cylinder mode and from the current wiring mode to the corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, and may specifically include: comparing the current operating frequency with a target operating frequency of the compressor, a frequency threshold value associated with the current cylinder block mode and the current wiring mode respectively; determining a target cylinder mode and a target wiring mode based on a first comparison result of a target operating frequency of the compressor with a frequency threshold value associated with the current cylinder mode and the current wiring mode and a second comparison result of the current operating frequency with a frequency threshold value associated with the current cylinder mode and the current wiring mode; and switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
Fig. 2 is a schematic flow chart of a control method of the heat exchange device of the present invention according to an exemplary embodiment.
The flow shown in fig. 2 will be described below by taking the operation mode of the air conditioner as the cooling mode as an example.
Step 11, when the load grade of the compressor determined when the air conditioner is started is a low-load grade, the initial cylinder mode of the compressor is a single-cylinder mode, and at the moment, the initial wiring mode corresponding to the low-load grade is a star-shaped wiring mode; the compressor is in a mode combination of 'single cylinder mode + star connection mode';
step 2, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the star-shaped wiring modeiTarget operating frequency of the compressor is fc2；
If the target operating frequency of the compressor satisfies fc2＞fcdAnd the current operating frequency of the compressor satisfies fcd≤fi＜fcuIf so, determining that the target cylinder mode is a single-cylinder mode, and the target wiring mode is a triangular wiring mode; f. ofcdAnd fcuFrequency threshold for correlating current cylinder mode and current wire mode, wherein fcdThe lower limit frequency value f of the star connection mode is converted into the triangle connection mode under the single-cylinder refrigeration modecuConverting the upper limit frequency value of the triangular wiring mode for the star wiring mode in the refrigeration mode;
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a triangular wiring mode;
if the target operating frequency and the current operating condition of the compressor do not satisfy the above-described judgment condition, the current mode combination (single cylinder mode + star connection mode) of the compressor is maintained unchanged.
Step 3, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fc3；
If the target operating frequency of the compressor satisfies fc3＞fcAnd the current operating frequency of the compressor satisfies fi＜fcuWhen, then the target cylinder is determinedThe mode is a single-cylinder mode, and the target wiring mode is a star-shaped wiring mode; f. ofcAnd fcu' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein fcThe operating energy efficiency turning point frequency f corresponding to the star-delta connection method under the single-cylinder refrigeration statecuThe upper limit frequency of the triangle connection to the star connection under the single-cylinder refrigeration state is changed;
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a star connection mode;
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (single cylinder mode + triangular wiring mode) of the compressor unchanged.
Step 4, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fc4(ii) a Here, if the compressor is stably operated in the mode combination of the "single cylinder mode + delta connection mode", the target operation frequency of the compressor is fc3Is equal to fc4；
If the target operating frequency of the compressor satisfies fc4＞FcdAnd the current operating frequency of the compressor satisfies Fcd≤fi＜FcuIf so, determining that the target cylinder mode is a double-cylinder mode, and the target wiring mode is a star-shaped wiring mode; fcdAnd FcuFrequency threshold for correlating current cylinder mode and current wire mode, wherein FcdThe lower limit frequency value is F for the 'single cylinder + triangle wiring mode' to 'double cylinder + star wiring mode' under the refrigeration modecuThe upper limit frequency value of the 'single cylinder + triangle wiring mode' is converted into 'double cylinder + star wiring mode' in the refrigeration mode;
the compressor of the air conditioner is operated in a mode combination of a determined 'double-cylinder mode + star connection mode';
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (single cylinder mode + triangular wiring mode) of the compressor unchanged.
Here, in step 12, if the load level of the compressor determined when the air conditioner is started is a high load level, the initial cylinder mode of the compressor is a double-cylinder mode, and at this time, the initial wiring mode corresponding to the high load level is a star-shaped wiring mode; the compressor is in a mode combination of a double-cylinder mode and a star connection mode;
step 5, acquiring the current operating frequency f of the compressor in the mode combination of the' double-cylinder mode + star connection modeiTarget operating frequency of the compressor is fc5；
If the target operating frequency of the compressor satisfies fc5＜Fc', and the current operating frequency of the compressor satisfies fi＜FcuIf yes, determining that the target cylinder mode is a single-cylinder mode, and determining that the target wiring mode is a triangular wiring mode; fc' and Fcu' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein FcThe operating energy efficiency turning point frequency is F for a refrigeration mode of ' single cylinder mode + triangular wiring mode ' turning ' double cylinder mode + star wiring modecuThe upper limit frequency of a double-cylinder mode, a star connection mode, a single-cylinder mode and a triangular connection mode in a refrigeration mode is 'changed';
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a triangular wiring mode;
and if the target operating frequency and the current operating condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the star connection mode) of the compressor unchanged.
Step 6, acquiring the current operating frequency f of the compressor in the mode combination of the' double-cylinder mode + star connection modeiTarget operating frequency of the compressor is fc6(ii) a Here, if the compressor is stably operated in the mode combination of the "two-cylinder mode + star-connected mode", the target operation frequency of the compressor is fc5Is equal to fc6；
If the target operating frequency of the compressor satisfies fc6＜FScdAnd the current operating frequency of the compressor satisfies FScd≤fi＜FScuIf so, determining that the target cylinder mode is a double-cylinder mode, and the target wiring mode is a triangular wiring mode; FS (file system)cdAnd FScuFrequency threshold for correlating current cylinder mode and current wire mode, wherein FScdConverting star connection mode into triangle connection mode lower limit frequency value FS under double-cylinder refrigeration modecuConverting the upper limit frequency value of the triangular wiring mode for the star wiring mode under the double-cylinder refrigeration mode;
the compressor of the air conditioner operates in a determined mode combination of a double-cylinder mode and a triangular wiring mode;
and if the target operating frequency and the current operating condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the star connection mode) of the compressor unchanged.
Step 7, acquiring the current operating frequency f of the compressor in the mode combination of the double-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fc7；
If the target operating frequency of the compressor satisfies fc7＜FScAnd the current operating frequency of the compressor satisfies fi＜FScuIf yes, determining that the target cylinder mode is a double-cylinder mode, and determining that the target wiring mode is a star-shaped wiring mode; FS (file system)cAnd FScu' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein FScdThe operation energy efficiency turning point frequency, FS, corresponding to the star-delta connection method in the double-cylinder refrigeration modecuThe upper limit frequency of the delta connection to the star connection under the double-cylinder refrigeration state is changed;
the compressor of the air conditioner is operated in a mode combination of a determined 'double-cylinder mode + star connection mode';
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the triangular wiring mode) of the compressor unchanged.
It should be understood that, the above steps 1 to 6 do not limit the switching order among the steps, but are intended to illustrate a specific flow of switching from the current mode combination to the target mode combination corresponding to the satisfied determination condition when different mode combinations satisfy different determination conditions.
Similarly, the flow shown in fig. 2 will be described with an example in which the operation mode of the air conditioner is the heating mode.
Step 11, when the load grade of the compressor determined when the air conditioner is started is a low-load grade, the initial cylinder mode of the compressor is a single-cylinder mode, and at the moment, the initial wiring mode corresponding to the low-load grade is a star-shaped wiring mode; the compressor is in a mode combination of 'single cylinder mode + star connection mode';
step 2, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the star-shaped wiring modeiTarget operating frequency of the compressor is fr2；
If the target operating frequency of the compressor satisfies fr2＞frdAnd the current operating frequency of the compressor satisfies frd≤fi＜fruIf so, determining that the target cylinder mode is a single-cylinder mode, and the target wiring mode is a triangular wiring mode; f. ofrdAnd fruFrequency threshold for correlating current cylinder mode and current wire mode, wherein frdConverting the star connection mode into the triangle connection mode lower limit frequency value f under the single-cylinder heating moderuConverting the upper limit frequency value of the triangular wiring mode for the star wiring mode in the heating mode;
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a triangular wiring mode;
if the target operating frequency and the current operating condition of the compressor do not satisfy the above-described judgment condition, the current mode combination (single cylinder mode + star connection mode) of the compressor is maintained unchanged.
Step 3, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fr3；
If the target operating frequency of the compressor satisfies fr3＞frAnd the current operating frequency of the compressor satisfies fi＜fruIf yes, determining that the target cylinder mode is a single-cylinder mode, and determining that the target wiring mode is a star-shaped wiring mode; f. ofrAnd fru' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein frThe operating energy efficiency turning point frequency f corresponding to the star-delta connection method in the single-cylinder heating stateruThe upper limit frequency of the triangle connection to the star connection in the single-cylinder heating state is changed;
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a star connection mode;
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (single cylinder mode + triangular wiring mode) of the compressor unchanged.
Step 4, acquiring the current operating frequency f of the compressor in the mode combination of the single-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fr4(ii) a Here, if the compressor is stably operated in the mode combination of the "single cylinder mode + delta connection mode", the target operation frequency of the compressor is fr3Is equal to fr4；
If the target operating frequency of the compressor satisfies fr4＞FrdAnd the current operating frequency of the compressor satisfies Frd≤fi＜FruIf so, determining that the target cylinder mode is a double-cylinder mode, and the target wiring mode is a star-shaped wiring mode; frdAnd FruFrequency threshold for correlating current cylinder mode and current wire mode, wherein FrdThe lower limit frequency value of 'single cylinder + triangle wiring mode' to 'double cylinder + star wiring mode' in the heating mode is FruThe upper limit frequency value of the 'single cylinder + triangular wiring mode' is converted into 'double cylinders + star wiring mode' in the heating mode;
the compressor of the air conditioner is operated in a mode combination of a determined 'double-cylinder mode + star connection mode';
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (single cylinder mode + triangular wiring mode) of the compressor unchanged.
Here, in step 12, if the load level of the compressor determined when the air conditioner is started is a high load level, the initial cylinder mode of the compressor is a double-cylinder mode, and at this time, the initial wiring mode corresponding to the high load level is a star-shaped wiring mode; the compressor is in a mode combination of a double-cylinder mode and a star connection mode;
step 5, acquiring the current operating frequency f of the compressor in the mode combination of the' double-cylinder mode + star connection modeiTarget operating frequency of the compressor is fr5；
If the target operating frequency of the compressor satisfies fr5＜Fr', and the current operating frequency of the compressor satisfies fi＜FruIf yes, determining that the target cylinder mode is a single-cylinder mode, and determining that the target wiring mode is a triangular wiring mode; fr' and Fru' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein FrThe operating energy efficiency turning point frequency of 'single cylinder mode + triangular wiring mode' to 'double cylinder mode + star wiring mode' in heating mode, FruThe upper limit frequency of the ' double-cylinder mode + star connection mode ' to ' single-cylinder mode + triangle connection mode ' in the heating mode is ' lower limit frequency;
the compressor of the air conditioner is operated in a mode combination of a determined single cylinder mode and a triangular wiring mode;
and if the target operating frequency and the current operating condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the star connection mode) of the compressor unchanged.
Step 6, acquiring the current operating frequency f of the compressor in the mode combination of the' double-cylinder mode + star connection modeiTarget operating frequency of the compressor is fr6(ii) a Here, if the compressor is stably operated in the mode combination of the "two-cylinder mode + star-connected mode", the target operation frequency of the compressor is fr5Is equal to fr6；
If the purpose of the compressorThe standard operating frequency satisfies fr6＜FSrdAnd the current operating frequency of the compressor satisfies FSrd≤fi＜FSruIf so, determining that the target cylinder mode is a double-cylinder mode, and the target wiring mode is a triangular wiring mode; FS (file system)rdAnd FSruFrequency threshold for correlating current cylinder mode and current wire mode, wherein FSrdConverting star connection mode into triangle connection mode lower limit frequency value FS under double-cylinder heating moderuConverting the upper limit frequency value of the triangular wiring mode for the star wiring mode under the double-cylinder heating mode;
the compressor of the air conditioner operates in a determined mode combination of a double-cylinder mode and a triangular wiring mode;
and if the target operating frequency and the current operating condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the star connection mode) of the compressor unchanged.
Step 7, acquiring the current operating frequency f of the compressor in the mode combination of the double-cylinder mode and the triangular wiring modeiTarget operating frequency of the compressor is fr7；
If the target operating frequency of the compressor satisfies fr7＜FSrAnd the current operating frequency of the compressor satisfies fi＜FSruIf yes, determining that the target cylinder mode is a double-cylinder mode, and determining that the target wiring mode is a star-shaped wiring mode; FS (file system)rAnd FSru' is a frequency threshold that correlates the current cylinder mode and the current wire mode, wherein FSrdThe operating energy efficiency turning point frequency, FS, corresponding to the star-delta connection method in the double-cylinder heating moderuConverting the triangle connection method into star connection method upper limit frequency in a double-cylinder heating state;
the compressor of the air conditioner is operated in a mode combination of a determined 'double-cylinder mode + star connection mode';
and if the target operation frequency and the current operation condition of the compressor do not meet the judgment condition, maintaining the current mode combination (the double-cylinder mode + the triangular wiring mode) of the compressor unchanged.
It should be understood that, the above steps 1 to 6 do not limit the switching order among the steps, but are intended to illustrate a specific process of switching from the current mode combination to the target mode combination corresponding to the satisfied determination condition when different four mode combinations satisfy different determination conditions.
FIG. 3 is a graph illustrating a multi-stage energy efficiency point for a compressor, according to an exemplary embodiment. Fig. 3 is a variation curve of the air conditioner compressor in the above four mode combinations, in which the solid line is a curve variation of the compressor energy efficiency point of the heat exchanger of the present invention, and the dotted line is a curve variation of the compressor energy efficiency point of the existing heat exchanger; the graph shows that the energy efficiency points of the existing compressor at the single-cylinder stage and the double-cylinder stage are not higher than the energy efficiency points of the compressor of the heat exchange equipment, and compared with the existing compressor, the compressor of the heat exchange equipment can achieve better energy-saving and consumption-reducing effects.
The two compression cylinder bodies of the compressor shown above are cylinder bodies with the same volume, and switching between four energy efficiency points can be realized; as another optional embodiment, the compressor may further include two cylinders with different volumes, including a small compression cylinder and a large compression cylinder, so that switching between six energy efficiency points may be achieved, specifically including a "small cylinder mode + star connection mode", a "small cylinder mode + triangle connection mode", a "large cylinder mode + star connection mode", a "large cylinder mode + triangle connection mode", a "double cylinder mode + star connection mode", and a "double cylinder mode + triangle connection mode", where an increase in the energy efficiency points may adapt to a load with a wider range, and thus working condition adaptability of the compressor is improved.
The switching pattern of the six energy efficiency points may refer to the switching procedure shown earlier; it should be understood that, in view of the technical content disclosed in the foregoing, a person skilled in the art can reasonably derive and use the technical idea of the present invention to obtain a switching manner of six energy efficiency points, and should be considered as falling within the protection scope of the present invention.
In addition, the improved mode is not only suitable for the type of the compressor with the switching of the single-cylinder mode and the double-cylinder mode, but also suitable for the type of the compressor capable of performing single-stage compression and double-stage compression, wherein the single-stage compression of the compressor refers to the operation of performing one-time compression on a refrigerant through a one-stage compression cylinder body; the two-stage compression means that the two-stage compression cylinder performs one-time compression operation on the refrigerant compressed by the one-stage compression cylinder. When single-stage and double-stage compression is started, energy efficiency points can be correspondingly increased according to actual load requirements, such as a single-stage + star connection mode, a double-stage + triangle connection mode, a single-stage + triangle connection mode and a double-stage + star connection mode.
FIG. 4 is a schematic flow chart illustrating a method for controlling a heat exchange apparatus of the present invention according to yet another exemplary embodiment.
As shown in fig. 4, there is also provided a control method applicable to the heat exchange device with the multi-stage energy efficiency point compressor shown in the foregoing, the control method comprising:
s401, acquiring a current cylinder mode and a current operating frequency of a compressor;
in the present embodiment, the cylinder mode includes a single cylinder mode or a double cylinder mode;
s402, switching the compressor from the current cylinder block mode to the corresponding target cylinder block mode and from the current wiring mode to the corresponding target wiring mode based on the current cylinder block mode and the current operating frequency of the compressor;
the wiring pattern includes a star wiring pattern or a delta wiring pattern.
As an optional embodiment, the control method further includes:
determining the load grade when the compressor is started;
an initial cylinder mode of the compressor is determined based on a load level when the compressor is turned on.
As an alternative embodiment, determining the load level at the time of starting the compressor includes:
acquiring state parameters when the air conditioner is started, wherein the state parameters comprise one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user;
and judging the load grade of the compressor when the compressor is started based on the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
As an alternative embodiment, the determining the initial cylinder mode of the compressor based on the load level when the compressor is started comprises:
if the load grade when the compressor is started is the set low-load grade, determining that the initial cylinder mode of the compressor is the single-cylinder mode;
and if the load grade when the compressor is started is the set high load grade, determining that the initial cylinder mode of the compressor is the double-cylinder mode.
As an alternative embodiment, switching the compressor from the current cylinder mode to the corresponding target cylinder mode and from the current wiring mode to the corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor includes:
comparing the current operating frequency and the target operating frequency of the compressor with preset frequency thresholds respectively; the frequency threshold is associated with a current cylinder mode and a current wire mode;
determining a target cylinder block mode and a target wiring mode based on a first comparison result of the current operating frequency of the compressor and a preset frequency threshold and a second comparison result of the target operating frequency of the compressor and the preset frequency threshold;
and switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
The specific implementation of the above embodiments can refer to the foregoing contents, and will not be described herein.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A heat exchange device with a multi-stage energy efficiency point compressor is characterized in that,
the compressor comprises a machine body, wherein the machine body is provided with two compression cylinder bodies and a terminal winding circuit capable of switching star connection and triangular connection;
the heat exchange equipment also comprises a controller, a controller and a controller, wherein the controller is used for acquiring the current cylinder mode and the current operating frequency of the compressor, and the cylinder mode comprises a single-cylinder mode and a double-cylinder mode; and the number of the first and second groups,
switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from a current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring modes including a star wiring mode and a delta wiring mode.
2. The heat exchange apparatus of the multi-stage energy efficient point compressor of claim 1, wherein the controller is further configured to:
determining the load level of the compressor when the compressor is started;
determining an initial cylinder mode of the compressor based on a load level when the compressor is turned on.
3. The heat exchange device of the multi-stage energy efficiency point compressor as claimed in claim 2, further comprising one or more sensors for acquiring status parameters when the air conditioner is started, wherein the status parameters include one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user;
the controller is specifically configured to: and judging the load grade when the compressor is started up on the basis of the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
4. The heat exchange apparatus of the multi-stage energy efficient point compressor of claim 2, wherein the controller has a means for:
if the load grade when the compressor is started is a set low-load grade, determining that the initial cylinder mode of the compressor is a single-cylinder mode;
and if the load grade when the compressor is started is a set high load grade, determining that the initial cylinder mode of the compressor is a double-cylinder mode.
5. The heat exchange device of the multi-stage energy efficiency point compressor according to claim 1, wherein the controller is specifically configured to:
comparing the current operating frequency and the target operating frequency of the compressor with preset frequency thresholds respectively; the preset frequency threshold is associated with the current cylinder mode and the current wiring mode;
determining the target cylinder mode and the target wiring mode based on a first comparison result of the current operating frequency of the compressor with the preset frequency threshold and a second comparison result of the target operating frequency of the compressor with the preset frequency threshold;
switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
6. A control method of a heat exchange device with a multi-stage energy efficiency point compressor is characterized by comprising the following steps:
acquiring a current cylinder mode and a current operating frequency of the compressor, wherein the cylinder mode comprises a single-cylinder mode and a double-cylinder mode;
switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from a current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor, the wiring modes including a star wiring mode and a delta wiring mode.
7. The control method according to claim 6, characterized by further comprising:
determining the load level of the compressor when the compressor is started;
determining an initial cylinder mode of the compressor based on a load level when the compressor is turned on.
8. The control method of claim 7, wherein said determining a load level at which said compressor is turned on comprises:
acquiring state parameters when the air conditioner is started, wherein the state parameters comprise one or more of the following parameters: indoor ambient temperature, outdoor ambient temperature and target temperature set by a user;
and judging the load grade of the compressor when the compressor is started up on the basis of the state parameters and the current heat exchange mode of the air conditioner, wherein the heat exchange mode comprises a refrigeration mode and a heating mode.
9. The control method according to claim 7, wherein the determining an initial cylinder mode of the compressor based on a load level at a time of starting the compressor includes:
if the load grade when the compressor is started is a set low-load grade, determining that the initial cylinder mode of the compressor is a single-cylinder mode;
and if the load grade when the compressor is started is a set high load grade, determining that the initial cylinder mode of the compressor is a double-cylinder mode.
10. The control method according to claim 6, wherein the switching the compressor from the current cylinder mode to a corresponding target cylinder mode and from the current wiring mode to a corresponding target wiring mode based on the current cylinder mode and the current operating frequency of the compressor includes:
comparing the current operating frequency and the target operating frequency of the compressor with preset frequency thresholds respectively; the preset frequency threshold is associated with the current cylinder mode and the current wiring mode;
determining the target cylinder mode and the target wiring mode based on a first comparison result of the current operating frequency of the compressor with the preset frequency threshold and a second comparison result of the target operating frequency of the compressor with the preset frequency threshold;
switching the compressor from the current cylinder mode to the determined target cylinder mode and from the current wiring mode to the determined target wiring mode.
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CN111854078A (en) * 2019-04-26 2020-10-30 青岛海尔空调器有限总公司 Control method and control device of variable frequency air conditioner and variable frequency air conditioner
CN111854084A (en) * 2019-04-26 2020-10-30 青岛海尔空调器有限总公司 Control method and control device of variable frequency air conditioner and variable frequency air conditioner
CN110259687A (en) * 2019-07-15 2019-09-20 珠海格力节能环保制冷技术研究中心有限公司 The control method and air-conditioner set of compressor and compressor
CN110542195B (en) * 2019-09-24 2020-08-07 珠海格力节能环保制冷技术研究中心有限公司 Compressor control method and device, storage medium, processor and compressor
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