CN104006497A - One-to-multi air conditioning system refrigerant flow control method and device - Google Patents
One-to-multi air conditioning system refrigerant flow control method and device Download PDFInfo
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- CN104006497A CN104006497A CN201410226731.8A CN201410226731A CN104006497A CN 104006497 A CN104006497 A CN 104006497A CN 201410226731 A CN201410226731 A CN 201410226731A CN 104006497 A CN104006497 A CN 104006497A
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Abstract
The invention discloses a one-to-multi air conditioning system refrigerant flow control method. The method includes that an outdoor unit receives a temperature adjusting signal transmitted by indoor units; when the temperature adjusting signal is received for the first time, the outdoor unit acquires the sum of refrigerant quantities required by the indoor units according to the temperature adjusting signal; the frequency of a compressor is adjusted correspondingly according to the refrigerant quantity sum required by the indoor units; the openness of electronic expansion valves on refrigerant pipelines between the indoor unit and the outdoor units is adjusted to enable the refrigerant generated during adjustment of the frequency of the compressor to flow to the refrigerant pipelines of the indoor units receiving the refrigerant control signal. A one-to-multi air conditioning system refrigerant flow control device is further disclosed. The structure of the one-to-multi air conditioning system is not changed. When the refrigerant quantity required by a specific indoor unit is required to be increased or reduced, the refrigerant quantities of other indoor units are not affected, and the requirement of the specific indoor unit for the refrigerant quantity is met.
Description
Technical field
The present invention relates to air-conditioner field, relate in particular to a kind of control method and device of cold medium flux of multi-split air conditioner.
Background technology
At present along with economic development is more and more faster, consumer is more and more higher to the requirement of air-conditioning, small-sized household central air-conditioning is more and more subject to consumer's favor, because of its only an outer machine just can meet the different hot-cool demand in a plurality of rooms, without a plurality of outer machines are installed in room outside.
In general, user can select machine in a corresponding number according to room area size.But, when the actual use of residential central air conditioning, if run into special circumstances, for example the too high compressor frequency that causes of outdoor temperature limits, hall holds that dinner party number is more, certain room Exposure to Sunlight is stronger, or there is special heat-producing device etc. in room, therefore, original indoor set just there will be refrigerating capacity not enough, and temperature is difficult to drop to the problem of design temperature.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method and device of cold medium flux of multi-split air conditioner, be intended to not change the structure of multi-split air conditioner, both the refrigeration or the heating capacity demand that had met specific indoor set, do not affect again the impact of other indoor-unit cooling-medium amounts.
For reaching above object, the control method of the cold medium flux of a kind of multi-split air conditioner provided by the invention, in described multi-split air conditioner, an off-premises station connects a plurality of indoor sets, and on the refrigerant pipeline that off-premises station is connected with indoor set, be respectively equipped with electric expansion valve, described control method comprises the following steps:
Off-premises station receives the temperature conditioning signal that indoor set sends;
When described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the required coolant quantity sum of each indoor set;
The coolant quantity sum required according to each indoor set, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
Meanwhile, regulate the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
Preferably, the aperture of the electric expansion valve on the refrigerant pipeline between described adjusting off-premises station and each indoor set, comprises so that the refrigerant variable quantity producing while regulating compressor frequency flows to the refrigerant pipeline of the indoor set that receives refrigerant control signal:
Detect the indoor temperature T of indoor set region;
Calculate the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set, and according to described difference, regulate the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station.
Preferably, the aperture of the electric expansion valve on the described refrigerant pipeline that regulates described indoor set and off-premises station according to difference comprises:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
Preferably, the detection of the indoor temperature T of described indoor set region is periodically to detect, and the detection of the indoor temperature T of described indoor set region preset time after the frequency adjustment of compressor starts to detect.
Preferably, the step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve is fixed, or along with the temperature detection cycle successively decreases, or along with corresponding setting of size of described difference.
Preferably, described control method also comprises:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, the frequency retrieval of compressor, for the frequency before regulating, is reverted to the opening value before regulating by the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set.
Accordingly, the present invention also provides a kind of control device of cold medium flux of multi-split air conditioner, and in described multi-split air conditioner, an off-premises station connects a plurality of indoor sets, and on the refrigerant pipeline that off-premises station is connected with indoor set, be respectively equipped with electric expansion valve, described control device comprises:
Receiver module, the temperature conditioning signal sending for receiving indoor set;
Coolant quantity acquisition module, for when described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the required coolant quantity sum of each indoor set;
Compressor frequency adjustment module, for the coolant quantity sum required according to each indoor set, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
Electric expansion valve adjustment module, for regulating the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
Preferably, described electric expansion valve adjustment module comprises:
Temperature detecting unit, for detection of the indoor temperature T of indoor set region;
Difference computational unit, for calculating the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set;
Regulation unit, regulates the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station according to described difference.
Preferably, described regulation unit is used for:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
Preferably, the detection of the indoor temperature T of described indoor set region is periodically to detect, and the detection of the indoor temperature T of described indoor set region preset time after the frequency adjustment of compressor starts to detect.
Preferably, the step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve is fixed, or along with the temperature detection cycle successively decreases, or along with corresponding setting of size of described difference.
Preferably, compressor frequency adjustment module also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, by the frequency retrieval of compressor, be the frequency before regulating, by the frequency retrieval of compressor, be the frequency before adjusting;
Described electric expansion valve adjustment module also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set is reverted to the opening value before regulating.
The embodiment of the present invention receives the temperature conditioning signal of indoor set by off-premises station, with the frequency to compressor, regulate, so that coolant quantity meets the required coolant quantity sum of each indoor set, but also will regulate the aperture of the electric expansion valve on the corresponding pipeline of each indoor set, so that the refrigerant variable quantity producing while regulating compressor frequency flows in the refrigerant pipeline of the indoor set that receives refrigerant control signal.Therefore, the embodiment of the present invention is not changing the structure of multi-split air conditioner, when the required coolant quantity of the specific indoor set of needs increases or reduces, neither affects the impact of other indoor-unit cooling-medium amounts, can meet again the requirement of the required coolant quantity of specific indoor set.
Accompanying drawing explanation
Fig. 1 is the structural representation of multi-split air conditioner of the invention process;
Fig. 2 is the flow example figure of control method one embodiment of the cold medium flux of multi-split air conditioner of the present invention;
Fig. 3 is the refinement schematic flow sheet that regulates the electric expansion valve on the pipeline that off-premises station is connected with indoor set in the control method of cold medium flux of multi-split air conditioner of the present invention;
Fig. 4 is the flow example figure of another embodiment of control method of the cold medium flux of multi-split air conditioner of the present invention;
Fig. 5 is the high-level schematic functional block diagram of control device preferred embodiment of the cold medium flux of multi-split air conditioner of the present invention;
Fig. 6 is the refinement high-level schematic functional block diagram of electric expansion valve adjustment module in Fig. 5.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Below in conjunction with Figure of description and specific embodiment, further illustrate technical scheme of the present invention.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The implementation environment of control method of the cold medium flux of multi-split air conditioner of the present invention is shown as shown in Figure 1.This multi-split air conditioner comprises outer machine part and interior machine part, and wherein, outer machine partly comprises compressor 10, cross valve 20, outdoor heat exchanger 30, low pressure valve 50, high pressure valve 60, electric expansion valve 70 and capillary 80.Interior machine partly comprises at least two indoor heat exchangers 40.The exhaust outlet of compressor 10 is connected with a valve port of cross valve 20, and the gas returning port of compressor 10 is connected with another valve port of cross valve 20, and two valve ports of residue of cross valve 20 are connected with outdoor heat exchanger 30 with indoor heat exchanger 40 respectively.And be also connected with low pressure valve 50 between cross valve 20 and indoor heat exchanger 40.Between outdoor heat exchanger 30 and indoor heat exchanger 40, be connected with capillary 80, electric expansion valve 70, high pressure valve 60 in turn.Be understandable that, this air-conditioning system is frequency-conversion air-conditioning system or with the fixed frequency air conditioner system of electric expansion valve.
Because interior machine indoor heat exchanger number partly in the multi-split air conditioner shown in Fig. 1 is 5: indoor heat exchanger 40a, indoor heat exchanger 40b, indoor heat exchanger 40c, indoor heat exchanger 40d, indoor heat exchanger 40e.Accordingly, the low pressure valve 50 of outdoor section is also 5: low pressure valve 50a, low pressure valve 50b, low pressure valve 50c, low pressure valve 50d, low pressure valve 50e.The capillary of outdoor section is 5: capillary 70a, capillary 70b, capillary 70c, capillary 70d, capillary 70e.The electric expansion valve 70 of outdoor section is 5: electric expansion valve 70a, electric expansion valve 70b, electric expansion valve 70c, electric expansion valve 70d, electric expansion valve 70e.The high pressure valve 60 of outdoor section is 5: high pressure valve 60a, high pressure valve 60b, high pressure valve 60c, high pressure valve 60d, high pressure valve 60e.
Multi-split air conditioner based on said structure, the present invention proposes a kind of control method of cold medium flux of multi-split air conditioner.As shown in Figure 2, this control method comprises the following steps:
Step S110, off-premises station receive the temperature conditioning signal that indoor set sends;
Each indoor set can receive user by remote controller or the temperature conditioning signal that sends on indoor unit panel, and the described temperature conditioning signal receiving is sent to off-premises station master control borad.Be understandable that, a control button can be set separately on remote controller or on indoor unit panel, to trigger described temperature conditioning signal.
Step S120, when described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the required coolant quantity sum of each indoor set;
When described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the needed coolant quantity of each indoor set in running.Take indoor set a as example, indoor set a receives the temperature conditioning signal (reducing by 3 ℃) that user sends, indoor set a is sent to off-premises station master control borad by the temperature conditioning signal receiving, off-premises station master control borad, according to this temperature conditioning signal, calculates acquisition indoor set a region and need to heighten 3 ℃ of coolant quantities that also need increase.Then, obtain the needed coolant quantity of each indoor set.
Step S130, the coolant quantity sum required according to each indoor set, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
The required coolant quantity of each indoor set calculating according to step S120, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set.Specifically can be: after regulating according to temperature conditioning signal, the required coolant quantity sum of each indoor set is compared according to the increment △ of the required coolant quantity sum of each indoor set before the adjusting of temperature conditioning signal, calculate the frequency variation of the required adjusting compressor of this increment △, then according to the frequency variation of described calculating, regulate the frequency of compressor.
Step S140, regulate the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
The multi-split air conditioner of take operates in refrigeration mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and is that temperature reduces by 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.The temperature conditioning signal that outer machine part receives according to indoor set a, the frequency of adjusting compressor.When if the aperture of the electric expansion valve on the pipeline that now off-premises station is communicated with each indoor set is constant, regulate the refrigerant variable quantity that produces after the frequency of compressor will uniform-flow to the pipeline of indoor set a, indoor set b and indoor set c.Now, cannot make the temperature of indoor set a region reach the temperature requirement that reduces by 2 ℃ the coolant quantity that causes indoor set a, the coolant quantity of indoor set b and indoor set c is too much, and the temperature of indoor set b and indoor set c region is reduced.
Therefore, the embodiment of the present invention is regulating the frequency of compressor, so that the coolant quantity that compressor is discharged is when meeting the required coolant quantity sum of operating each indoor set, also by the aperture of the electric expansion valve on the refrigerant pipeline regulating between off-premises station and each indoor set.For example the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and indoor set a is increased, the aperture of the electric expansion valve on the refrigerant pipeline by off-premises station respectively and between indoor set b, indoor set c reduces, and can realize the refrigerant variable quantity producing while regulating compressor frequency and flow in the refrigerant pipeline of the indoor set a that receives refrigerant control signal.Thereby the embodiment of the present invention is not changing the structure of multi-split air conditioner, when the required coolant quantity of the specific indoor set of needs increases or reduces, neither affect the impact of other indoor-unit cooling-medium amounts, can meet again the requirement of the required coolant quantity of specific indoor set.
Further, as shown in Figure 3, above-mentioned steps S140 comprises:
The indoor temperature T of step S141, detection indoor set region;
Be specially: the detection of the indoor temperature T of described indoor set region, for periodically detecting, makes the indoor temperature T of indoor set region reach design temperature with the adjusting by electric expansion valve.
In addition, the detection of the indoor temperature T of described indoor set region preset time after the frequency adjustment of compressor starts to detect.Arranging of this preset time can be according to after the frequency adjustment of compressor, and corresponding refrigerant variable quantity has produced corresponding impact to the temperature of indoor set region.
Step S142, calculate the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set, and according to described difference, regulate the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station.
Calculate the difference △ T of the indoor temperature T of indoor set region and the design temperature T0 of described indoor set, and △ T=T-T0.Then according to the comparative result of difference △ T and predetermined threshold value, regulate the aperture of the electric expansion valve on the refrigerant pipeline of indoor set and off-premises station.
Above-mentioned regulating step is specially:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
The multi-split air conditioner of take operates in refrigeration mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and temperature reduces by 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.After the frequency that regulates compressor, during a preset time, the temperature of each indoor set region will periodically be detected.For example, design temperature corresponding to indoor set a region being detected is 25 ℃, current indoor temperature is 26 ℃, according to the difference of Current Temperatures and design temperature (being 1 ℃), known this difference is greater than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a increases.If design temperature corresponding to indoor set b region being detected is 26 ℃, current indoor temperature is 25 ℃, according to the difference of Current Temperatures and design temperature (1 ℃), known this difference is less than predetermined threshold value, reduce the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a reduces.Circulation execution step S141 and step S142, even equal design temperature so that the Current Temperatures of indoor set region levels off to.
The multi-split air conditioner of take operates in heating mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and temperature raises 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.That is to say, the predetermined threshold value during electronic expansion valve regulation at indoor set a pipeline place is 2 ℃, and the predetermined threshold value during electronic expansion valve regulation at the pipeline place of indoor set b and indoor set c is 0 ℃.After the frequency that regulates compressor, during a preset time, the temperature of each indoor set region will periodically be detected.For example, design temperature corresponding to indoor set a region being detected is 27 ℃, current indoor temperature is 26 ℃, according to the difference of Current Temperatures and design temperature (being-1 ℃), known this difference is less than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a increases.If design temperature corresponding to indoor set b region being detected is 26 ℃, current indoor temperature is 27 ℃, according to the difference of Current Temperatures and design temperature (1 ℃), known this difference is greater than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a reduces.Circulation execution step S141 and step S142, even equal design temperature so that the Current Temperatures of indoor set region levels off to.
Be understandable that, predetermined threshold value is herein 0 ℃, or a value range, for example-0.2 ℃≤predetermined threshold value≤0.2 ℃.
Further, the step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve fix or, or along with the temperature detection cycle successively decreases, or along with corresponding setting of size of described difference.
After the indoor temperature of each detection indoor set region, the adjusting step-length of electric expansion valve can be fixedly installed, for example 1 step.The adjusting step-length of this electric expansion valve also can be successively decreased according to the temperature detection cycle, and for example temperature detection is during the cycle for the first time, and design temperature being detected is 27 ℃, and current indoor temperature is 25 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 3 steps; Temperature detection is during the cycle for the second time, and design temperature being detected is 27 ℃, and current indoor temperature is 26 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 2 steps; Temperature detection is during the cycle for the third time, and design temperature being detected is 27 ℃, and current indoor temperature is 26.5 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 1 step.Certainly, also the periodic adjustment step-length of electric expansion valve can be set according to the size correspondence of difference.For example, difference is larger, and the periodic adjustment step-length of electric expansion valve is larger, and difference is less, and the periodic adjustment step-length of electric expansion valve is less.So can reduce the adjusting number of times of electric expansion valve, so that the indoor temperature of indoor set region reaches design temperature fast.
Further, as shown in Figure 4, above-mentioned control method also comprises:
Step S150, when off-premises station receives the refrigerant control signal that described indoor set sends again, the frequency retrieval of compressor, for the frequency before regulating, is reverted to the opening value before regulating by the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set.
When not needing to carry out refrigerant control, can again send refrigerant control signal by the function button on remote controller or air-conditioner panel, indoor set receives after this refrigerant control signal, will be sent to off-premises station.Off-premises station is according to this refrigerant control signal, and the frequency retrieval of controlling compressor is the frequency before regulating, and the aperture of controlling the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set reverts to the opening value before regulating.
Accordingly, as shown in Figure 5, proposed the control device of the cold medium flux of multi-split air conditioner, this control device comprises:
Receiver module 110, the temperature conditioning signal sending for receiving indoor set; ;
Coolant quantity acquisition module 120, for when described temperature conditioning signal is when receiving first, described off-premises station is according to described temperature conditioning signal, obtains the required coolant quantity sum of indoor set described in each;
Compressor frequency adjustment module 130, for the coolant quantity sum required according to indoor set described in each, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
Electric expansion valve adjustment module 140, for regulating the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
Each indoor set can receive user by remote controller or the temperature conditioning signal that sends on indoor unit panel, and the described temperature conditioning signal receiving is sent to off-premises station master control borad.110 of receiver modules receive the temperature conditioning signal that indoor set sends.Be understandable that, a control button can be set separately on remote controller or on indoor unit panel, to trigger described temperature conditioning signal.
When described temperature conditioning signal is when receiving first, the coolant quantity acquisition module 120 of described off-premises station, according to described temperature conditioning signal, obtains the needed coolant quantity of each indoor set in running.Take indoor set a as example, indoor set a receives the temperature conditioning signal (reducing by 3 ℃) that user sends, indoor set a is sent to off-premises station master control borad by the temperature conditioning signal receiving, off-premises station master control borad, according to this temperature conditioning signal, calculates acquisition indoor set a region and need to heighten 3 ℃ of coolant quantities that also need increase.Then, coolant quantity acquisition module 120 obtains the needed coolant quantity sum of each indoor set.
The required coolant quantity of each indoor set that compressor frequency adjustment module 130 is calculated according to coolant quantity acquisition module 120, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set.Specifically can be: after regulating according to temperature conditioning signal, the required coolant quantity sum of each indoor set is compared according to the increment △ of the required coolant quantity sum of each indoor set before the adjusting of temperature conditioning signal, calculate the frequency variation of the required adjusting compressor of this increment △, then according to the frequency variation of described calculating, regulate the frequency of compressor.
After regulating the frequency of compressor, electric expansion valve adjustment module 140 is the aperture of the electric expansion valve on the refrigerant pipeline regulating between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.Concrete adjustment process is as follows:
The multi-split air conditioner of take operates in refrigeration mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and is that temperature reduces by 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.The temperature conditioning signal that outer machine part receives according to indoor set a, the frequency of adjusting compressor.When if the aperture of the electric expansion valve on the pipeline that now off-premises station is communicated with each indoor set is constant, regulate the refrigerant variable quantity that produces after the frequency of compressor will uniform-flow to the pipeline of indoor set a, indoor set b and indoor set c.Now, cannot make the temperature of indoor set a region reach the temperature requirement that reduces by 2 ℃ the coolant quantity that causes indoor set a, the coolant quantity of indoor set b and indoor set c is too much, and the temperature of indoor set b and indoor set c region is reduced.
Therefore, the embodiment of the present invention is regulating the frequency of compressor, so that the coolant quantity that compressor is discharged is when meeting the required coolant quantity sum of operating each indoor set, also by the aperture of the electric expansion valve on the refrigerant pipeline regulating between off-premises station and each indoor set.For example the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and indoor set a is increased, the aperture of the electric expansion valve on the refrigerant pipeline by off-premises station respectively and between indoor set b, indoor set c reduces, and can realize the refrigerant variable quantity producing while regulating compressor frequency and flow in the refrigerant pipeline of the indoor set a that receives refrigerant control signal.Thereby the embodiment of the present invention is not changing the structure of multi-split air conditioner, when the required coolant quantity of the specific indoor set of needs increases or reduces, neither affect the impact of other indoor-unit cooling-medium amounts, can meet again the requirement of the required coolant quantity of specific indoor set.
Further, as shown in Figure 6, described electric expansion valve adjustment module 140 comprises:
Temperature detecting unit 141, for detection of the indoor temperature T of indoor set region;
Difference computational unit 142, for calculating the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set;
Regulation unit 143, regulates the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station according to described difference.
The detection of the indoor temperature T of above-mentioned indoor set region is that temperature detecting unit 141 periodically detects, and with the adjusting by electric expansion valve, makes the indoor temperature T of indoor set region reach design temperature.
In addition, detection preset time after the frequency adjustment of compressor of the indoor temperature T of 141 pairs of indoor set regions of described temperature detecting unit starts to detect.Arranging of this preset time can be according to after the frequency adjustment of compressor, and corresponding refrigerant variable quantity has produced corresponding impact to the temperature of indoor set region.
Difference computational unit 142 is calculated the difference △ T of the indoor temperature T of indoor set region and the design temperature T0 of described indoor set, and △ T=T-T0.Then regulation unit 143 is according to the comparative result of difference △ T and predetermined threshold value, regulates the aperture of the electric expansion valve on the refrigerant pipeline of indoor set and off-premises station.
Further, described regulation unit 143 for:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
The multi-split air conditioner of take operates in refrigeration mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and temperature reduces by 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.After the frequency that regulates compressor, during a preset time, the temperature of each indoor set region will periodically be detected.For example, design temperature corresponding to indoor set a region being detected is 25 ℃, current indoor temperature is 26 ℃, according to the difference of Current Temperatures and design temperature (being 1 ℃), known this difference is greater than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a increases.If design temperature corresponding to indoor set b region being detected is 26 ℃, current indoor temperature is 25 ℃, according to the difference of Current Temperatures and design temperature (1 ℃), known this difference is less than predetermined threshold value, reduce the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a reduces.Circulation execution step S141 and step S142, even equal design temperature so that the Current Temperatures of indoor set region levels off to.
The multi-split air conditioner of take operates in heating mode as example, and wherein indoor set a, indoor set b and indoor set c are in operation work, and indoor set d and indoor set e do not open.This multi-split air conditioner only has indoor set a to receive temperature conditioning signal, and temperature raises 2 ℃; Indoor set b, indoor set c do not receive temperature conditioning signal, temperature-resistant.That is to say, the predetermined threshold value during electronic expansion valve regulation at indoor set a pipeline place is 2 ℃, and the predetermined threshold value during electronic expansion valve regulation at the pipeline place of indoor set b and indoor set c is 0 ℃.After the frequency that regulates compressor, during a preset time, the temperature of each indoor set region will periodically be detected.For example, design temperature corresponding to indoor set a region being detected is 27 ℃, current indoor temperature is 26 ℃, according to the difference of Current Temperatures and design temperature (being-1 ℃), known this difference is less than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a increases.If design temperature corresponding to indoor set b region being detected is 26 ℃, current indoor temperature is 27 ℃, according to the difference of Current Temperatures and design temperature (1 ℃), known this difference is greater than predetermined threshold value, increase the aperture of electric expansion valve, so that the coolant quantity in the pipeline of indoor set a reduces.Circulation execution step S141 and step S142, even equal design temperature so that the Current Temperatures of indoor set region levels off to.
Be understandable that, predetermined threshold value is herein 0 ℃, or a value range, for example-0.2 ℃≤predetermined threshold value≤0.2 ℃.
Further, the step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve is fixed, or along with the temperature detection cycle successively decreases, or along with corresponding setting of size of described difference.
After the indoor temperature of each detection indoor set region, the adjusting step-length of electric expansion valve can be fixedly installed, for example 1 step.The adjusting step-length of this electric expansion valve also can be successively decreased according to the temperature detection cycle, and for example temperature detection is during the cycle for the first time, and design temperature being detected is 27 ℃, and current indoor temperature is 25 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 3 steps; Temperature detection is during the cycle for the second time, and design temperature being detected is 27 ℃, and current indoor temperature is 26 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 2 steps; Temperature detection is during the cycle for the third time, and design temperature being detected is 27 ℃, and current indoor temperature is 26.5 ℃, and the periodic adjustment step-length that this electric expansion valve is set is 1 step.Certainly, also the periodic adjustment step-length of electric expansion valve can be set according to the size correspondence of difference.For example, difference is larger, and the periodic adjustment step-length of electric expansion valve is larger, and difference is less, and the periodic adjustment step-length of electric expansion valve is less.So can reduce the adjusting number of times of electric expansion valve, so that the indoor temperature of indoor set region reaches design temperature fast.
Further, above-mentioned compressor frequency adjustment module 130 also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, by the frequency retrieval of compressor, be the frequency before regulating;
Described electric expansion valve adjustment module 140 also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set is reverted to the opening value before regulating.
When not needing to carry out refrigerant control, can again send refrigerant control signal by the function button on remote controller or air-conditioner panel, indoor set receives after this refrigerant control signal, will be sent to off-premises station.Off-premises station is according to this refrigerant control signal, and the frequency retrieval of controlling compressor is the frequency before regulating, and the aperture of controlling the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set reverts to the opening value before regulating.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.Through the above description of the embodiments, those skilled in the art can be well understood to the mode that above-described embodiment method can add essential general hardware platform by software and realize, can certainly pass through hardware, the control circuit in air-conditioner for example, but in a lot of situation, the former is better embodiment.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprise that some instructions are with so that a station terminal equipment (can be mobile phone, computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The foregoing is only the preferred embodiments of the present invention; not thereby limit its scope of the claims; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; directly or indirectly be used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. the control method of the cold medium flux of a multi-split air conditioner, in described multi-split air conditioner, an off-premises station connects a plurality of indoor sets, and is respectively equipped with electric expansion valve on the refrigerant pipeline that is connected with indoor set of off-premises station, it is characterized in that, described control method comprises the following steps:
Off-premises station receives the temperature conditioning signal that indoor set sends;
When described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the required coolant quantity sum of each indoor set;
The coolant quantity sum required according to each indoor set, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
Regulate the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
2. the control method of the cold medium flux of multi-split air conditioner as claimed in claim 1, it is characterized in that, the aperture of the electric expansion valve on the refrigerant pipeline between described adjusting off-premises station and each indoor set, comprises so that the refrigerant variable quantity producing while regulating compressor frequency flows to the refrigerant pipeline of the indoor set that receives refrigerant control signal:
Detect the indoor temperature T of indoor set region;
Calculate the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set, and according to described difference, regulate the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station.
3. the control method of the cold medium flux of multi-split air conditioner as claimed in claim 2, is characterized in that, the aperture of the electric expansion valve on the described refrigerant pipeline that regulates described indoor set and off-premises station according to difference comprises:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
4. the control method of the cold medium flux of multi-split air conditioner as claimed in claim 3, it is characterized in that, the detection of the indoor temperature T of described indoor set region is periodically to detect, and the detection of the indoor temperature T of described indoor set region preset time after the frequency adjustment of compressor starts to detect.
5. the control method of the coolant quantity of multi-split air conditioner as claimed in claim 4, it is characterized in that, step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve is fixed, or along with the temperature detection cycle successively decreases, or along with the size correspondence of described difference arranges.
6. the control method of the cold medium flux of the multi-split air conditioner as described in claim 1-5 any one, is characterized in that, described control method also comprises:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, the frequency retrieval of compressor, for the frequency before regulating, is reverted to the opening value before regulating by the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set.
7. the control device of the cold medium flux of a multi-split air conditioner, in described multi-split air conditioner, an off-premises station connects a plurality of indoor sets, and is respectively equipped with electric expansion valve on the refrigerant pipeline that is connected with indoor set of off-premises station, it is characterized in that, described control device comprises:
Receiver module, the temperature conditioning signal sending for receiving indoor set;
Coolant quantity acquisition module, for when described temperature conditioning signal is when receiving first, described off-premises station, according to described temperature conditioning signal, obtains the required coolant quantity sum of each indoor set;
Compressor frequency adjustment module, for the coolant quantity sum required according to each indoor set, the corresponding frequency that regulates compressor, so that the coolant quantity that compressor is discharged meets the required coolant quantity sum of operating each indoor set;
Electric expansion valve adjustment module, for regulating the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set, so that the refrigerant variable quantity flow direction producing while regulating compressor frequency receives in the refrigerant pipeline of indoor set of refrigerant control signal.
8. the control device of the cold medium flux of multi-split air conditioner as claimed in claim 7, is characterized in that, described electric expansion valve adjustment module comprises:
Temperature detecting unit, for detection of the indoor temperature T of indoor set region;
Difference computational unit, for calculating the difference of the indoor temperature T of described indoor set region and the design temperature T0 of described indoor set;
Regulation unit, regulates the aperture of the electric expansion valve on the refrigerant pipeline of described indoor set and off-premises station according to described difference.
9. the control device of the cold medium flux of multi-split air conditioner as claimed in claim 8, is characterized in that, described regulation unit is used for:
When T-T0 is less than predetermined threshold value, reduce the aperture of electric expansion valve;
When T-T0 equals predetermined threshold value, the aperture of electric expansion valve is constant;
When T-T0 is greater than predetermined threshold value, increase the aperture of electric expansion valve;
Wherein said predetermined threshold value is 0 ℃.
10. the control device of the cold medium flux of multi-split air conditioner as claimed in claim 9, it is characterized in that, the detection of the indoor temperature T of described indoor set region is periodically to detect, and the detection of the indoor temperature T of described indoor set region preset time after the frequency adjustment of compressor starts to detect.
The control device of the cold medium flux of 11. multi-split air conditioners as claimed in claim 10, it is characterized in that, step-length after the indoor temperature of described each detection indoor set region during the adjusting of electric expansion valve is fixed, or along with the temperature detection cycle successively decreases, or along with the size correspondence of described difference arranges.
12. as the control device of the cold medium flux of the multi-split air conditioner of claim 7-11 any one, it is characterized in that, compressor frequency adjustment module also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, by the frequency retrieval of compressor, be the frequency before regulating;
Described electric expansion valve adjustment module also for:
When off-premises station receives the refrigerant control signal of described indoor set transmission again, the aperture of the electric expansion valve on the refrigerant pipeline between off-premises station and each indoor set is reverted to the opening value before regulating.
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