CN108195099B - Variable frequency multi-split air conditioner and control method thereof - Google Patents

Variable frequency multi-split air conditioner and control method thereof Download PDF

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Publication number
CN108195099B
CN108195099B CN201711447901.5A CN201711447901A CN108195099B CN 108195099 B CN108195099 B CN 108195099B CN 201711447901 A CN201711447901 A CN 201711447901A CN 108195099 B CN108195099 B CN 108195099B
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China
Prior art keywords
temperature
opening degree
threshold
throttling
cooling
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CN201711447901.5A
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CN108195099A (en
Inventor
李丛来
曹培春
左计学
杨营孔
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B29/00Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • F25B31/006Compressor arrangements cooling of compressor or motor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F25B2313/02331Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during cooling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F25B2313/02334Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements during heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/08Exceeding a certain temperature value in a refrigeration component or cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2115Temperatures of a compressor or the drive means therefor
    • F25B2700/21153Temperatures of a compressor or the drive means therefor of electronic components
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a variable frequency multi-split air conditioner and a control method thereof, relates to the technical field of multi-split air conditioners, and aims to solve the problem that in the prior art, a compressor is protected and shut down due to the fact that too little refrigerant is in a cooler. The invention relates to a frequency conversion multi-split air conditioner, which comprises an outdoor unit, a plurality of indoor units and a heat exchange main loop, wherein the outdoor unit comprises a first throttling device and a heat exchange branch which are arranged on the heat exchange main loop, the heat exchange branch comprises a cooling heat exchanger and a second throttling device, the cooling heat exchanger is used for cooling a driving circuit board of a compressor, and the frequency conversion multi-split air conditioner also comprises a temperature sensor which is arranged on the driving circuit board of the compressor and is used for detecting the temperature of the driving circuit board; a controller for acquiring the temperature of the driving circuit board from the temperature sensor; and in case the temperature fulfils the first condition, decreasing the opening degree of the first throttle device and/or increasing the opening degree of the second throttle device. The variable frequency multi-split air conditioner is used for providing cooling or heating for a plurality of rooms with variable refrigerant flow.

Description

Variable frequency multi-split air conditioner and control method thereof
Technical Field
The invention relates to the technical field of multi-split air-conditioning systems, in particular to a variable-frequency multi-split air-conditioning system and a control method thereof.
Background
The frequency conversion multi-split air conditioner comprises at least one outdoor unit, a plurality of indoor units and a heat exchange loop for communicating the outdoor unit with the indoor units, wherein the outdoor unit comprises an outdoor heat exchanger, a compressor and other refrigeration accessories, the indoor units comprise a fan, an indoor heat exchanger and the like, the compressor is provided with a driving circuit board for realizing frequency conversion, and the outdoor compressor can adjust the flow output of a refrigerant through the change of the rotating speed to match the change of the demand of the indoor units according to the change of indoor load, so that the energy consumption of the air conditioner is lower.
In the existing frequency conversion multi-split air conditioner, a heat exchange branch is connected in parallel on a part of pipelines positioned in an outdoor unit in a heat exchange loop, and a cooling heat exchanger is arranged on the heat exchange branch and used for cooling a driving circuit board of a compressor.
In practical application, if when the indoor set refrigerate simultaneously with heat, for 4 indoor sets carry out the operation of refrigerating originally, an indoor set heats the operation, later switch into 1 indoor set and heat the operation, an indoor set carries out the operation of refrigerating, it is less to get into the refrigerant in the heat transfer branch road can appear, it is relatively poor to lead to cooling heat exchanger to compressor drive circuit board's cooling effect, the drive circuit board temperature of compressor is higher, influence the reliability of air conditioner, arouse the problem that compressor protection shut down easily.
Disclosure of Invention
The embodiment of the invention provides a variable frequency multi-split air conditioner and a control method thereof, which can solve the problem of compressor protection shutdown caused by too little refrigerant in a cooler in the prior art.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the utility model provides a frequency conversion multi-split air conditioner, includes off-premises station, a plurality of indoor set and is used for communicateing the off-premises station and a plurality of the heat transfer major loop of indoor set, be equipped with the compressor in the off-premises station, and the off-premises station contains the first throttling arrangement who sets up on the heat transfer major loop, and with the parallelly connected heat transfer branch road of first throttling arrangement, including cooling heat exchanger and second throttling arrangement in the heat transfer branch road, the cooling heat exchanger is used for cooling the drive circuit board of compressor, still includes: the temperature sensor is arranged on a driving circuit board of the compressor and used for detecting the temperature of the driving circuit board; a controller for acquiring the temperature of the driving circuit board from the temperature sensor; and in the case that the temperature satisfies a first condition, decreasing the opening degree of the first throttle device and/or increasing the opening degree of the second throttle device; wherein the first condition comprises the temperature being greater than a first threshold; or comprises the temperature being greater than the first threshold and less than the second threshold.
The embodiment of the invention also comprises a control method of the variable frequency multi-split air conditioner, the variable frequency multi-split air conditioner comprises an outdoor unit, a plurality of indoor units and a heat exchange main loop for communicating the outdoor unit with the indoor units, a compressor is arranged in the outdoor unit, the outdoor unit comprises a first throttling device arranged on the heat exchange main loop and a heat exchange branch connected with the first throttling device in parallel, the heat exchange branch comprises a cooling heat exchanger and a second throttling device, the cooling heat exchanger is used for cooling a driving circuit board of the compressor, and the control method comprises the following steps: acquiring the temperature of the driving circuit board; reducing the opening degree of the first throttle device and/or increasing the opening degree of the second throttle device when the temperature satisfies a first condition; wherein the first condition comprises the temperature being greater than a first threshold; or comprises the following steps: the temperature is greater than a first threshold and less than a second threshold.
According to the variable frequency multi-split air conditioner and the control method thereof provided by the embodiment of the invention, when the detected temperature of the compressor driving circuit board detected by the temperature sensor is greater than the first threshold value, or the detected temperature is greater than the first threshold value and less than the second threshold value, the opening degree of the first throttling device can be reduced, or the opening degree of the second throttling device can be increased, or the opening degree of the first throttling device is reduced and the opening degree of the second throttling device is increased at the same time, so that the quantity of refrigerant flowing through the cooling heat exchanger is increased, the heat exchange effect of the cooling heat exchanger and the driving circuit board is better, the temperature of the driving circuit board is kept in a lower range, the phenomenon of protective shutdown of the compressor is reduced, and the reliability of equipment is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a refrigerant cycle of a water-cooled inverter VRF air conditioner;
FIG. 2 is a schematic diagram of a refrigerant cycle of the water-cooled inverter multi-split air conditioner in a full heating operation;
FIG. 3 is a schematic diagram of a refrigerant cycle of the water-cooled variable frequency multi-split air conditioner in full cooling operation;
FIG. 4 is a schematic view of a refrigerant cycle when the total capacity of the indoor units for cooling is greater than the total capacity of the indoor units for heating in the water-cooled variable frequency multi-split air conditioner;
FIG. 5 is a schematic diagram of a refrigerant cycle when the total capacity of the indoor units for heating is greater than the total capacity of the indoor units for cooling in the water-cooled variable frequency multi-split air conditioner;
fig. 6 is a schematic flow chart of a control method of a variable frequency multi-split air conditioner in embodiment 1;
fig. 7 is a flowchart illustrating a control method of the variable frequency multi-split air conditioner in embodiment 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Fig. 1 is a schematic diagram of a refrigerant cycle of a water-cooled inverter multi-split air conditioner.
Referring to fig. 1, the water-cooled variable frequency multi-connected unit includes an outdoor unit 100, three indoor units, and a main heat exchange circuit 300 communicating the outdoor unit 100 and the plurality of indoor units. The components of the main heat exchange loop 300 arranged in the outdoor unit 100 include a compressor 1, an oil separator 2, a one-way valve 3, a four-way reversing valve assembly 4, a gas-liquid separator 5, a high-pressure liquid reservoir 6, an outdoor heat exchanger 7, a first electronic expansion valve 8, a second electronic expansion valve 9, a cooling heat exchanger (not shown in the figure), and the like, wherein the second electronic expansion valve 9 and the cooling heat exchanger are connected in series, the first electronic expansion valve 8 is connected in parallel with the second electronic expansion valve 9 and the cooling heat exchanger, the cooling heat exchanger is used for cooling a driving circuit board 10 of the compressor 1, and a temperature sensor 17 is arranged on the driving circuit board 10 of the compressor; the components arranged in the indoor unit in the main heat exchange loop 300 include an indoor heat exchanger 11 and a third electronic expansion valve 12; further, a high/low pressure cutoff valve 13, a low pressure cutoff valve 14, and a liquid side cutoff valve 15 are provided between the indoor unit and the outdoor unit 100, and a control valve unit 16 for connecting each indoor unit to the outdoor unit 100, and auxiliary valve elements such as an electromagnetic valve, a capillary tube, and a filter are provided.
Foretell cooling heat exchanger includes first aluminum plate and the copper pipe of winding on first aluminum plate, and the below of compressor 1's driving circuit board 10 is equipped with the second aluminum plate, closely laminates first aluminum plate and second aluminum plate to the realization is to driving circuit board 10's cooling.
For the water-cooled variable frequency multi-split air conditioner, the outdoor heat exchanger 7 can be a plate heat exchanger or a shell and tube heat exchanger. The outdoor heat exchanger 7 in the water-cooled frequency conversion multi-split air conditioner in fig. 1 is a plate heat exchanger and is connected with a water inlet pipe and a water outlet pipe, as shown in the figure; the three indoor units are a first indoor unit 201, a second indoor unit 202 and a third indoor unit 203 respectively, the four-way reversing valve assembly 4 comprises a first four-way reversing valve 41 and a second four-way reversing valve 42, and the control valve unit 16 comprises a fourth electronic expansion valve 161 and a fifth electronic expansion valve 162 which are connected in parallel.
The on-off rules of each component and the flow of the refrigerant under each operating condition in the water-cooled multi-split air-conditioning unit in fig. 1 are described as follows:
(1) full heating mode
When all the indoor units are in a heating working condition, the flow direction of the refrigerant is as shown in fig. 2, the first four-way reversing valve 41 is closed, the end D is communicated with the end C, and the end E is communicated with the end S; the second four-way selector valve 42 is opened, the end D is connected to the end E, the end C is connected to the end S, the fourth electronic expansion valves 161 of all indoor units are opened, and the fifth electronic expansion valves 162 are closed.
The high-temperature and high-pressure refrigerant gas discharged from the exhaust end of the compressor 1 passes through the oil separator 2, the check valve 3, the D, C end of the first four-way reversing valve 41, the high-low pressure stop valve 13 and the fourth electronic expansion valve 161, is condensed by the indoor heat exchanger 11 and then is called high-pressure liquid refrigerant, and is divided into two refrigerant streams by the third electronic expansion valve 12 and the liquid side stop valve 15, wherein one refrigerant stream passes through the first electronic expansion valve 8, the other refrigerant stream passes through the cooling heat exchanger and the second electronic expansion valve 9, and then the two refrigerant streams are merged and then pass through the high-pressure liquid storage 6, the outdoor heat exchanger 7, the C, S end of the second four-way reversing valve 42 and the gas-liquid separator 5, and.
(2) Full refrigeration operating mode
When all the indoor units are in a refrigerating working condition, the flow direction of the refrigerant is as shown in fig. 3, the first four-way reversing valve 41 is opened, the end D is communicated with the end E, and the end C is communicated with the end S; the second four-way selector valve 42 is closed, the end D is connected to the end C, the end E is connected to the end S, the fourth electronic expansion valves 161 of all the indoor units are closed, and the fifth electronic expansion valve 162 is opened.
The high-temperature and high-pressure refrigerant gas discharged from the exhaust end of the compressor 1 passes through the oil separator 2, the check valve 3, the D, C end of the second four-way reversing valve 42, is condensed by the outdoor heat exchanger 7, is called as a high-pressure liquid refrigerant, is divided into two refrigerant streams by the high-pressure liquid reservoir 6, one refrigerant stream passes through the first electronic expansion valve 8, the other refrigerant stream passes through the cooling heat exchanger and the second electronic expansion valve 9, the two refrigerant streams are converged, passes through the liquid side stop valve 15, the third electronic expansion valve 12, the indoor heat exchanger 11, the fifth electronic expansion valve 162, the low-pressure stop valve 14 and the gas-liquid separator 5, and finally returns to the suction end.
(3) Heat recovery regime
When part of the indoor units are in a heating working condition and part of the indoor units are in a refrigerating working condition, the multi-split air conditioner is in a heat recovery working condition, and under two working conditions that the total capacity of the indoor units for refrigerating is larger than that of the indoor units for heating and the total capacity of the indoor units for heating is larger than that of the indoor units for refrigerating, two paths of the refrigerant are available.
Taking the total capacity of all the indoor units as an example, when the first indoor unit 201 and the second indoor unit 202 are in cooling operation and the third indoor unit 203 is in heating operation, that is, the total capacity of the indoor units performing cooling is greater than the total capacity of the indoor units performing heating (that is, the cooling load is greater than the heating load), both the first four-way selector valve 41 and the second four-way selector valve 42 are closed, the fourth electronic expansion valve 161 and the fifth electronic expansion valve 162 of the first indoor unit 201 and the second indoor unit 202 are closed, the fourth electronic expansion valve 161 and the fifth electronic expansion valve 162 of the third indoor unit 203 are opened, and the flow direction of the refrigerant is as shown in fig. 4.
The high-temperature and high-pressure refrigerant gas discharged from the exhaust end of the compressor 1 passes through the oil separator 2 and the check valve 3, and then is divided into two refrigerant streams, one refrigerant stream passes through the D, C end of the first four-way reversing valve 41, the high-low pressure stop valve 13, is condensed by the indoor heat exchanger 11 in the third indoor unit 203, then passes through the corresponding third electronic expansion valve 12, the other refrigerant stream passes through the D, C end of the second four-way reversing valve 42, the outdoor heat exchanger 7 and the high-pressure liquid storage 6, then enters the first electronic expansion valve 8, the second electronic expansion valve 9 and the cooling heat exchanger respectively, then is merged with the other refrigerant stream by the liquid side stop valve 15, passes through the third electronic expansion valve 12 and the indoor heat exchanger 11 of the first indoor unit 201 and the second indoor unit 202, then passes through the low-pressure stop valve 14 and the gas-liquid separator 5, and finally.
When the first indoor unit 201 and the second indoor unit 202 are in the heating operation and the third indoor unit 203 is in the cooling operation, that is, the total capacity of the indoor units performing heating is greater than the total capacity of the indoor units performing cooling ((that is, the heating load is greater than the cooling load)), the first four-way selector valve 41 is closed, the second four-way selector valve 42 is opened, the fourth electronic expansion valve 161 of the first indoor unit 201 and the second indoor unit 202 is opened, the fifth electronic expansion valve 162 is closed, the fourth electronic expansion valve 161 of the third indoor unit 203 is closed, the fifth electronic expansion valve 162 is opened, and the flow direction of the refrigerant is as shown in fig. 5.
High-temperature and high-pressure refrigerant gas discharged from the exhaust end of the compressor 1 respectively enters the indoor unit heat exchanger 11 and the third electronic expansion valve 12 in the first indoor unit 201 and the second indoor unit 202 through the oil separator 2, the check valve 3, the D, C end of the first four-way reversing valve 41 and the high-low pressure stop valve 13, the two refrigerant gas are converged and then divided into two refrigerant streams, and one refrigerant stream passes through the third electronic expansion valve 12 and the indoor unit heat exchanger 11 in the third indoor unit 203 and then passes through the fifth electronic expansion valve 162 and the low-pressure stop valve 14; the other refrigerant passes through a liquid side stop valve 15, a first electronic expansion valve 8, a cooling heat exchanger, a second electronic expansion valve 9, a high-pressure liquid storage device 6, an outdoor heat exchanger 7 and an C, S end of a second four-way reversing valve 42; the two refrigerants are merged and then return to the suction end of the compressor 1 through the gas-liquid separator 5.
Example 1
The embodiment is a control method of a variable frequency multi-split air conditioner, the variable frequency multi-split air conditioner comprises an outdoor unit, a plurality of indoor units and a heat exchange main loop for communicating the outdoor unit and the plurality of indoor units, a compressor is arranged in the outdoor unit, the outdoor unit comprises a first throttling device arranged on the heat exchange main loop and a heat exchange branch connected with the first throttling device in parallel, the heat exchange branch comprises a cooling heat exchanger and a second throttling device, and the cooling heat exchanger is used for cooling a driving circuit board of the compressor. The control method in the embodiment includes acquiring the temperature of the driving circuit board, and reducing the opening degree of the first throttling device, or increasing the opening degree of the second throttling device, or reducing the opening degree of the first throttling device while increasing the opening degree of the second throttling device, in the case that the temperature of the driving circuit board satisfies the first condition. Wherein the first condition includes that the temperature of the driving circuit board is greater than a first threshold.
In the control method of the embodiment, by obtaining the temperature of the driving circuit board, when the temperature of the driving circuit board is greater than the first threshold value, the opening degree of the first electronic expansion valve 8 may be decreased, or the opening degree of the second electronic expansion valve 9 may be increased, or the opening degree of the first electronic expansion valve 8 may be decreased while the opening degree of the second electronic expansion valve 9 is increased, for example, the opening degree of the first electronic expansion valve 8 in fig. 1 or fig. 2 may be decreased, so as to increase the amount of the refrigerant flowing through the cooling heat exchanger, so that the heat exchange effect between the cooling heat exchanger and the driving circuit board is better, and the temperature of the driving circuit board may be maintained in a lower range, so as to reduce the occurrence of the phenomenon.
In this embodiment, the variable frequency multi-split air conditioner may be an air-cooled variable frequency multi-split air conditioner or a water-cooled variable frequency multi-split air conditioner. Because the water source multi-split air conditioner is arranged in the closed equipment room, the frequency conversion driving circuit board cannot dissipate heat through heat exchange with outside air after a large amount of heat is generated, and the heat dissipation needs to be carried out by a cooling heat exchanger, the control method of the embodiment has a good heat dissipation effect on the frequency conversion driving circuit board for improving the water source multi-split air conditioner.
Taking the water-cooled multi-split air conditioner shown in fig. 1 as an example, the number of the outdoor units 100 in the multi-split air conditioner is not limited to one, and may be more than one; the number of the indoor units is not limited to 3, and may also be 2 or more than 3, the first throttling device corresponds to the first electronic expansion valve 8, the second throttling device corresponds to the second electronic expansion valve 9, and the control valve components on the heat exchange main loop are not limited to those shown in fig. 1, and may be added or reduced according to the actual functional requirements, without limiting the present application.
Optionally, the acquiring the temperature of the driving circuit board 10 includes: the temperature of the driving circuit board 10 is acquired a plurality of times at set time intervals.
Based on the above-mentioned embodiment, the above-mentioned indoor unit includes a third throttling device, i.e. the third electronic expansion valve 12 in fig. 3, disposed on the heat exchange main loop. And if the opening degree of the third electronic expansion valve 12 in the first indoor unit is greater than the first set opening degree, reducing the opening degree of the third electronic expansion valve 12 in the first indoor unit under the conditions that at least one of the indoor units is in the heating operation, and all the indoor units in the cooling operation have the total capacity greater than all the indoor units in the heating operation, and the detected temperature meets the second condition. The first indoor unit is any one of the indoor units in heating operation, such as the third electronic expansion valve 12 of the third indoor unit 203 in fig. 4 is reduced; for the first time, the second condition includes that the temperature of the current time or the temperature of the last time is greater than a third threshold value; at the nth time (n is more than or equal to 2), the second condition comprises that the temperature at this time is more than the temperature at the last time, and the temperature at this time or the temperature at the last time is more than a third threshold value.
Alternatively, in the case where at least one of the plurality of indoor units is in the heating operation, at least one of the plurality of indoor units is in the cooling operation, and the total capacity of all the indoor units in the heating operation is greater than the total capacity of all the indoor units in the cooling operation, and the detected temperature satisfies the third condition, if the opening degree of the third electronic expansion valve 12 in the second indoor unit is greater than the first set opening degree, the opening degree of the third electronic expansion valve 12 in the second indoor unit is decreased. The second indoor unit is any one of the indoor units in cooling operation, such as the third electronic expansion valve 12 of the third indoor unit 203 in fig. 5 is reduced; for the first time, the third condition includes that the temperature of the current time or the temperature of the last time is greater than a third threshold value; at the nth time (n is more than or equal to 2), the second condition comprises that the temperature at this time is more than the temperature at the last time, and the temperature at this time or the temperature at the last time is more than a third threshold value.
In the above determination conditions of the temperature of the driving circuit board 10 and each threshold, taking the temperature of the driving circuit board 10 greater than the first threshold as an example, the temperature of the driving circuit board 10 may also be greater than or equal to the first threshold.
Optionally, the first throttling device, the second throttling device, and the third throttling device are electronic expansion valves, capillary tubes, or thermal expansion valves. Preferably, the first throttling device, the second throttling device and the third throttling device of the present embodiment employ electronic expansion valves, which are convenient to adjust, and can realize stepless adjustment and fast adjustment response.
The method for controlling the variable frequency multi-split air conditioner according to the present embodiment will be further described with reference to fig. 6.
When the temperature T of the drive circuit board 10 is acquired for the first time, that is, n is 1, in the case where the temperature T of the drive circuit board 10 is greater than the first threshold value, the opening degree of the first electronic expansion valve 8 is decreased, or the opening degree of the second electronic expansion valve 9 is increased, or the opening degree of the first electronic expansion valve 8 is decreased while the opening degree of the second electronic expansion valve 9 is increased.
When the temperature T (n) of the driving circuit board 10 is acquired for the nth time, namely n is larger than or equal to 2, and the temperature T (n) of the driving circuit board 10 is larger than a first threshold value, reducing the opening degree of the first electronic expansion valve 8, or increasing the opening degree of the second electronic expansion valve 9, or reducing the opening degree of the first electronic expansion valve 8 and simultaneously increasing the opening degree of the second electronic expansion valve 9;
after the adjustment is finished, when at least one of the indoor units is in heating operation and at least one of the indoor units is in cooling operation, and the total capacity of all the indoor units in cooling operation is larger than the total capacity of all the indoor units in heating operation, the temperature of the current time is larger than the temperature of the previous time and is larger than a third threshold value, if the opening degree of a third electronic expansion valve 12 in the first indoor unit is larger than a first set opening degree, the opening degree of the third electronic expansion valve 12 in the first indoor unit is reduced; or when at least one of the indoor units is in heating operation and at least one of the indoor units is in cooling operation, and the total capacity of all the indoor units in heating operation is greater than the total capacity of all the indoor units in cooling operation, and the temperature of the current time is greater than the previous temperature and greater than a third threshold, if the opening degree of the third electronic expansion valve 12 in the second indoor unit is greater than the first set opening degree, the opening degree of the third electronic expansion valve 12 in the second indoor unit is reduced.
And after the readjustment is finished, controlling the compressor to be protected and shut down under the condition that the temperature of the current time is greater than the second threshold value, and finishing the program.
Wherein the first threshold value is less than the third threshold value is less than the second threshold value.
Optionally, in this embodiment, the first threshold is 35 ℃, the third threshold is 70 ℃, the second threshold is 100 ℃, the set time interval is 20s, and the value range of the first set opening degree is 0.1 to 0.15 times of the rated opening degree of the third electronic expansion valve 12.
Alternatively, if the opening degree of the third expansion device in the first indoor unit is greater than the first set opening degree, the opening degree of the third electronic expansion valve 12 of the first indoor unit is decreased by a second set opening degree (i.e., a set number of steps). Alternatively, the set number of steps is 50 steps.
Example 2
This embodiment is another control method of the variable frequency multi-split air conditioner, similar to the method of embodiment 1. Similarly, the water-cooled multi-split air conditioner shown in fig. 1 is taken as an example.
The control method of the present embodiment includes acquiring the temperature of the driving circuit board 10, and in the case where the temperature of the driving circuit board 10 satisfies the first condition, decreasing the opening degree of the first electronic expansion valve 8 (i.e., the first throttle device), or increasing the opening degree of the second electronic expansion valve 9 (i.e., the second throttle device), or decreasing the opening degree of the first electronic expansion valve 8 while increasing the opening degree of the second electronic expansion valve 9. The first condition includes that the temperature of the driving circuit board 10 is greater than a first threshold and less than a second threshold.
Alternatively, if the temperature of the drive circuit board 10 is greater than the second threshold value, the compressor protection shutdown is controlled.
In the control method of the embodiment, by acquiring the temperature of the driving circuit board 10, when the temperature of the driving circuit board 10 is greater than the first threshold and less than the second threshold, the opening degree of the first electronic expansion valve 8 (i.e., the first throttling device) is decreased, or the opening degree of the second electronic expansion valve 9 (i.e., the second throttling device) is increased, or the opening degree of the first electronic expansion valve 8 is decreased while the opening degree of the second electronic expansion valve 9 is increased, so that the amount of the refrigerant flowing through the cooling heat exchanger is increased, the heat exchange effect between the cooling heat exchanger and the driving circuit board 10 is better, the temperature of the driving circuit board 10 is kept in a lower range, the phenomenon that the compressor is protected to stop is reduced, and the reliability of the device is.
Optionally, the acquiring the temperature of the driving circuit board 10 includes: the temperature of the driving circuit board 10 is acquired a plurality of times at set time intervals.
Based on the above-mentioned embodiment, the above-mentioned indoor unit includes a third throttling device, i.e. the third electronic expansion valve 12 in fig. 3, disposed on the heat exchange main loop. When at least one of the indoor units is in a heating operation state, and at least one of the indoor units is in a cooling operation state, the total capacity of all the indoor units in the cooling operation state is larger than the total capacity of all the indoor units in the heating operation state, and the temperature of the driving circuit board 10 satisfies a second condition, if the opening degree of the third electronic expansion valve 12 in the first indoor unit is larger than a first set opening degree, the opening degree of the third electronic expansion valve 12 in the first indoor unit is reduced. The first indoor unit is any one of the indoor units in heating operation, such as the third electronic expansion valve 12 of the third indoor unit 203 in fig. 4 is reduced; for the first time, the second condition includes that the temperature of the current time or the temperature of the last time is greater than a third threshold and less than a second threshold; at the nth time (n is more than or equal to 2), the second condition comprises that the temperature at this time is higher than the temperature at the last time, and the temperature at this time or the temperature at the last time is higher than a third threshold and lower than a second threshold.
Alternatively, in the case where at least one of the plurality of indoor units is in the heating operation, at least one of the plurality of indoor units is in the cooling operation, and the total capacity of all the indoor units in the heating operation is greater than the total capacity of all the indoor units in the cooling operation, and the temperature of the driving circuit board 10 satisfies the third condition, if the opening degree of the third throttle device in the second indoor unit is greater than the first set opening degree, the opening degree of the third electronic expansion valve 12 in the second indoor unit is decreased. The second indoor unit is any one of the indoor units in cooling operation, such as the third electronic expansion valve 12 of the third indoor unit 203 in fig. 5 is reduced; for the first time, the third condition includes that the temperature of the current time or the temperature of the last time is greater than a third threshold and less than a second threshold; at the nth time (n is more than or equal to 2), the third condition comprises that the temperature at this time is higher than the temperature at the last time, and the temperature at this time or the temperature at the last time is higher than a third threshold and lower than a second threshold.
Referring to fig. 7, a control method of the variable frequency multi-split air conditioner of the present embodiment will be further described.
When the temperature T of the driving circuit board 10 is acquired for the first time, that is, n is 1, in the case where the temperature T of the driving circuit board 10 is greater than the first threshold value and less than the second threshold value, the opening degree of the first electronic expansion valve 8 is decreased, or the opening degree of the second electronic expansion valve 9 is increased, or the opening degree of the first electronic expansion valve 8 is decreased while the opening degree of the second electronic expansion valve 9 is increased; in case the temperature T of the driving circuit board 10 is greater than the second threshold value, the compressor is shut down protected.
When the temperature t (n) of the driving circuit board 10 is acquired for the nth time, that is, n is greater than or equal to 2, the opening degree of the first electronic expansion valve 8 is reduced, or the opening degree of the second electronic expansion valve 9 is increased, or the opening degree of the first electronic expansion valve 8 is reduced while the opening degree of the second electronic expansion valve 9 is increased, under the condition that the temperature t (n) of the current time is greater than the temperature of the previous time and the temperature t (n) of the current time is greater than the first threshold value and less than the second threshold value.
When adjusting, at least one of the indoor units is in heating operation, at least one of the indoor units is in cooling operation, and the total capacity of all the indoor units in cooling operation is greater than the total capacity of all the indoor units in heating operation, and the temperature of this time is greater than a third threshold and less than a second threshold, if the opening degree of the third electronic expansion valve 12 in the first indoor unit is greater than a first set opening degree, the opening degree of the third electronic expansion valve 12 in the first indoor unit is reduced; or when at least one of the indoor units is in heating operation and at least one of the indoor units is in cooling operation, and the total capacity of all the indoor units in heating operation is greater than the total capacity of all the indoor units in cooling operation, and the temperature of the current time is greater than a third threshold and less than a second threshold, if the opening degree of the third electronic expansion valve 12 in the second indoor unit is greater than the first set opening degree, the opening degree of the third electronic expansion valve 12 in the second indoor unit is reduced.
Optionally, values of each threshold, the set interval time, the first set opening degree, and the second set opening degree in this embodiment may be the same as those in embodiment 1, and are not described here again.
Example 3
The embodiment is a variable frequency multi-split air conditioner, which comprises at least one outdoor unit (one or more indoor units), a plurality of indoor units and a heat exchange main loop for communicating the outdoor unit and the indoor units, wherein a compressor is arranged in the outdoor unit, the outdoor unit comprises a first throttling device arranged on the heat exchange main loop and a heat exchange branch connected with the first throttling device in parallel, the heat exchange branch comprises a cooling heat exchanger and a second throttling device, and the cooling heat exchanger is used for cooling a driving circuit board of the compressor; the temperature sensor is arranged on a driving circuit board of the compressor and used for detecting the temperature of the driving circuit board; the controller is used for acquiring the temperature of the driving circuit board from the temperature sensor. After the temperature of the driving circuit board of the compressor is obtained from the temperature sensor, the contents of the control methods in embodiments 1 and 2 can be referred to for other analysis and control functions of the controller, and are not described herein again.
The controller may be a Central Processing Unit (CPU), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The controller may be often referred to as a control panel, a main control panel, etc., and may be installed in an outdoor unit, for example; the control module can also comprise a control panel installed in the indoor unit and a control panel installed in the outdoor unit, and the control panels are in communication connection with each other to jointly realize the control function of the variable frequency multi-split air conditioner provided by the embodiment of the invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (8)

1. The utility model provides a frequency conversion multi-split air conditioner, includes off-premises station, a plurality of indoor set and is used for the intercommunication the off-premises station with a plurality of the heat transfer major loop of indoor set, be equipped with the compressor in the off-premises station, and the off-premises station contains the first throttling arrangement who sets up on the heat transfer major loop, and with the parallelly connected heat transfer branch road of first throttling arrangement, including cooling heat exchanger and second throttling arrangement in the heat transfer branch road, the cooling heat exchanger is used for cooling the drive circuit board of compressor, its characterized in that still includes:
the temperature sensor is arranged on a driving circuit board of the compressor and used for detecting the temperature of the driving circuit board;
a controller for acquiring the temperature of the driving circuit board from the temperature sensor; and in the case that the temperature satisfies a first condition, decreasing the opening degree of the first throttle device and/or increasing the opening degree of the second throttle device;
the indoor unit comprises a third throttling device arranged on the heat exchange main loop;
the controller is further specifically configured to: in the case that at least one of the indoor units is in a heating operation and at least one of the indoor units is in a cooling operation,
when the total capacity of all the indoor units in cooling operation is greater than that of all the indoor units in heating operation and the temperature meets a second condition, if the opening degree of the third throttling device in the first indoor unit is greater than a first set opening degree, the opening degree of the third throttling device in the first indoor unit is reduced, and the first indoor unit is any one of the indoor units in heating operation; or the like, or, alternatively,
when the total capacity of all the indoor units in heating operation is greater than that of all the indoor units in cooling operation and the temperature meets a third condition, if the opening degree of a third throttling device in a second indoor unit is greater than a first set opening degree, the opening degree of a third throttling device in the second indoor unit is reduced, and the second indoor unit is any one of the indoor units in cooling operation; wherein the first condition comprises the temperature being greater than a first threshold; or comprises the temperature being greater than the first threshold and less than a second threshold;
the second condition or the third condition includes: the temperature of this time or the temperature of the last time is greater than a third threshold, or the temperature of this time or the temperature of the last time is greater than the third threshold and less than the second threshold.
2. The variable frequency multi-split air conditioner according to claim 1, wherein the controller is specifically configured to: and acquiring the temperature of the driving circuit board detected by the temperature sensor for multiple times at set time intervals.
3. The variable frequency multi-split air conditioner according to claim 2, wherein n ≧ 2 at nth time,
the first condition further includes that the temperature of this time is greater than the temperature of the last time;
the second condition or the third condition includes: the temperature of this time is greater than the temperature of the last time, and the method further comprises the following steps: the temperature of this time or the temperature of the last time is greater than the third threshold, or the temperature of this time or the temperature of the last time is greater than the third threshold and is less than the second threshold; wherein the third threshold is greater than the first threshold.
4. The variable frequency multi-split air conditioner according to claim 1, wherein the controller is specifically configured to: and if the opening degree of the third throttling device in the first indoor unit is greater than the first set opening degree, reducing the third throttling device in the first indoor unit by a second set opening degree.
5. The variable frequency multi-split air conditioner according to claim 1, wherein the controller is specifically configured to: and if the opening degree of a third throttling device in the second indoor unit is greater than the first set opening degree, reducing the third throttling device in the second indoor unit by a second set opening degree.
6. A control method of a variable frequency multi-split air conditioner comprises an outdoor unit, a plurality of indoor units and a heat exchange main loop used for communicating the outdoor unit with the indoor units, wherein a compressor is arranged in the outdoor unit, the outdoor unit comprises a first throttling device arranged on the heat exchange main loop and a heat exchange branch connected with the first throttling device in parallel, the heat exchange branch comprises a cooling heat exchanger and a second throttling device, and the cooling heat exchanger is used for cooling a driving circuit board of the compressor, and the control method comprises the following steps:
acquiring the temperature of the driving circuit board;
reducing the opening degree of the first throttle device and/or increasing the opening degree of the second throttle device when the temperature satisfies a first condition;
the indoor unit comprises a third throttling device arranged on the heat exchange main loop;
in the case that at least one of the indoor units is in a heating operation and at least one of the indoor units is in a cooling operation,
when the total capacity of all the indoor units in cooling operation is greater than that of all the indoor units in heating operation and the temperature meets a second condition, if the opening degree of the third throttling device in the first indoor unit is greater than a first set opening degree, the opening degree of the third throttling device in the first indoor unit is reduced, and the first indoor unit is any one of the indoor units in heating operation; or the like, or, alternatively,
when the total capacity of all the indoor units in heating operation is greater than that of all the indoor units in cooling operation and the temperature meets a third condition, if the opening degree of a third throttling device in a second indoor unit is greater than a first set opening degree, the opening degree of a third throttling device in the second indoor unit is reduced, and the second indoor unit is any one of the indoor units in cooling operation;
wherein the first condition comprises the temperature being greater than a first threshold; or comprises the following steps: the temperature is greater than a first threshold and less than a second threshold;
the second condition or the third condition includes: the temperature of this time or the temperature of the last time is greater than a third threshold, or the temperature of this time or the temperature of the last time is greater than the third threshold and less than the second threshold.
7. The method according to claim 6, wherein the obtaining the temperature of the driving circuit board comprises:
and acquiring the temperature of the driving circuit board for multiple times at set time intervals.
8. The method as claimed in claim 7, wherein n ≧ 2 at nth time,
the first condition further includes that the temperature of this time is greater than the temperature of the last time;
the second condition or the third condition includes: the temperature of this time is greater than the temperature of the last time, and the method further comprises the following steps: the temperature of this time or the temperature of the last time is greater than the third threshold, or the temperature of this time or the temperature of the last time is greater than the third threshold and is less than the second threshold; wherein the third threshold is greater than the first threshold.
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