CN102788402A - Control method of air conditioning refrigerant circulation system and air conditioning system - Google Patents
Control method of air conditioning refrigerant circulation system and air conditioning system Download PDFInfo
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- CN102788402A CN102788402A CN2012102609072A CN201210260907A CN102788402A CN 102788402 A CN102788402 A CN 102788402A CN 2012102609072 A CN2012102609072 A CN 2012102609072A CN 201210260907 A CN201210260907 A CN 201210260907A CN 102788402 A CN102788402 A CN 102788402A
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Abstract
The invention discloses a control method of an air conditioning refrigerant circulation system and an air conditioning system. The control method of the air conditioning refrigerant circulation system comprises the following steps of: acquiring current temperature and pressure of a refrigerant at an outlet end of an air outlet pipe of a low pressure tank and calculating corresponding superheat degree; and when the superheat degree is less than a first threshold value, separating the refrigerant in the refrigerant circulation system and storing the separated refrigerant until the superheat degree is greater than a second threshold value, wherein the first threshold value is less than the second threshold value. According to the control system and the air conditioning system, the circulation of the refrigerant is improved, the liquid-state refrigerant can be effectively prevented from entering a compressor, and furtherthe compressor is protected better.
Description
Technical field
The present invention relates to the air-conditioner technical field, particularly a kind of control method of the air conditioner coolant circulatory system and air-conditioning system.
Background technology
The coolant injection amount of multi-connected air conditioning system is all bigger at present, and for capacity changeable multi-link formula air-conditioning system, the system compresses machine all has a minimum output.And in the system machine load hour, even the internal circulating load that the system compresses machine also makes system's refrigerant with the ability output of minimum is above system's actual demand.At this moment, if the internal circulating load of untimely Adjustment System refrigerant, the refrigerant potential evaporation of systemic circulation is incomplete, causes liquid refrigerants to be inhaled into compressor, makes compressor damage, has a strong impact on the reliability of system.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method of the air conditioner coolant circulatory system, and the internal circulating load that is intended to anti-locking system refrigerant is excessive and damage compressor.
To achieve these goals, the present invention provides a kind of control method of the air conditioner coolant circulatory system, may further comprise the steps:
Obtain the Current Temperatures and the pressure of the escape pipe port of export place refrigerant of low pressure jar, and calculate the degree of superheat that obtains correspondence;
When the said degree of superheat during less than first threshold, separate the refrigerant in the coolant circulating system, and store the refrigerant after separating, up to the said degree of superheat greater than second threshold value; Said first threshold is less than second threshold value.
Preferably, the control method of the said air conditioner coolant circulatory system also comprises: when the said degree of superheat during, the refrigerant that stores is inputed in the coolant circulating system greater than the 3rd threshold value, up to the said degree of superheat less than the 4th threshold value; Said the 4th threshold value is less than the 3rd threshold value and greater than said second threshold value.
Preferably, the control method of the said air conditioner coolant circulatory system also comprises: when receiving stopping signal, oil eliminator in the coolant circulating system is communicated with the low pressure jar.
The present invention also provides a kind of air-conditioning system, comprises oil eliminator, electric expansion valve, off-premises station heat exchanger and low pressure jar, and wherein this electric expansion valve is communicated with through first tube connector with the off-premises station heat exchanger; Said air-conditioning system also comprises fluid reservoir and controller, and this fluid reservoir is communicated with said first tube connector, and between the said fluid reservoir and first tube connector, is provided with first magnetic valve; Said fluid reservoir also is communicated with said low pressure jar, and between said fluid reservoir and said low pressure jar, is provided with second magnetic valve, and the escape pipe port of export of this low pressure jar is provided with temperature sensor; Said controller is according to the Current Temperatures of the escape pipe port of export place refrigerant of said temperature sensor and pressure sensor detection low pressure jar and the ON/OFF that pressure is controlled said first magnetic valve and second magnetic valve.
Preferably, said controling appliance body is used for: obtain the degree of superheat according to said Current Temperatures and calculation of pressure, when this degree of superheat during less than first threshold, will control said first magnetic valve and second magnetic valve and open; And, will control said first magnetic valve and second closed electromagnetic valve when this degree of superheat during greater than second threshold value; Said first threshold is less than second threshold value.
Preferably, said fluid reservoir is communicated with oil eliminator, and between this fluid reservoir and said oil eliminator, is provided with the 3rd magnetic valve; This fluid reservoir bottom is provided with second tube connector that is communicated with said low pressure jar, and this second tube connector is provided with the 4th magnetic valve; Said controller also is used for, and controls the ON/OFF of said the 3rd magnetic valve and the 4th magnetic valve according to the said degree of superheat.
Preferably, said controling appliance body is used for: when the said degree of superheat during greater than the 3rd threshold value, will control said the 3rd magnetic valve and the 4th magnetic valve and open; And, will control said the 3rd magnetic valve and the 4th magnetic valve and open when this degree of superheat during less than the 4th threshold value; Said the 4th threshold value is less than the 3rd threshold value and greater than said second threshold value.
Preferably, said controling appliance body is used for: when said controller receives stopping signal, then control said second magnetic valve and the 3rd magnetic valve and open.
The Current Temperatures of the escape pipe port of export place refrigerant of the present invention through obtaining the low pressure jar and the corresponding degree of superheat of calculation of pressure; And reasonably control the coolant quantity in the coolant circulating system according to this degree of superheat; Can prevent effectively that liquid refrigerants from getting into compressor; Prevent the overheat of compressor operation simultaneously, and then protected compressor better.
Description of drawings
Fig. 1 is the schematic flow sheet of control method first embodiment of the air conditioner coolant circulatory system of the present invention;
Fig. 2 is the schematic flow sheet of control method second embodiment of the air conditioner coolant circulatory system of the present invention;
Fig. 3 is the structural representation of first embodiment of air-conditioning system of the present invention.
The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
The specific embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
With reference to Fig. 1, Fig. 1 is the schematic flow sheet of control method first embodiment of the air conditioner coolant circulatory system of the present invention.The control method of the air conditioner coolant circulatory system that present embodiment provides may further comprise the steps:
Step S10 obtains the Current Temperatures and the pressure of the escape pipe port of export place refrigerant of low pressure jar, and calculates the degree of superheat that obtains correspondence;
For example; In the present embodiment; Can one temperature sensor and pressure sensor be set at the escape pipe port of export of low pressure jar, detect the Current Temperatures that gets into the compressor refrigerant, detect the current pressure that gets into the compressor refrigerant through pressure sensor through this temperature sensor; And should be sent to controller by current numerical value, calculate by controller and obtain the corresponding degree of superheat.The escape pipe that should be noted that the low pressure jar is communicated with the air inlet pipe of compressor, and promptly the end that is connected with the air inlet pipe of compressor of the escape pipe of low pressure jar is the escape pipe port of export of this low pressure jar.
Step S20 when the above-mentioned degree of superheat during less than first threshold, separates the refrigerant in the coolant circulating system, and stores the refrigerant after separating, up to this degree of superheat greater than second threshold value; This first threshold is less than second threshold value.
Air-conditioner outdoor unit comprises oil eliminator, electric expansion valve, controller, off-premises station heat exchanger and low pressure jar, and wherein this electric expansion valve is communicated with through first tube connector with the off-premises station heat exchanger.In the present embodiment, also a fluid reservoir can be set also in air-conditioner outdoor unit, this fluid reservoir is communicated with first tube connector, and between the fluid reservoir and first tube connector, is provided with first magnetic valve; Fluid reservoir also is communicated with the air inlet pipe of low pressure jar, and between fluid reservoir and low pressure jar, is provided with second magnetic valve.The degree of superheat that calculate to obtain when controller is during less than first threshold, and this moment, the internal circulating load of decidable refrigerant was excessive, thereby opened first magnetic valve and second magnetic valve by controller control.Owing to have the high-pressure liquid refrigerant in first tube connector, there is low pressure gas attitude refrigerant in the low pressure jar, make under the effect of pressure reduction that the part refrigerant flows in the fluid reservoir through first magnetic valve in the tube connector of winning, and be stored in the fluid reservoir.In with the part refrigerant separating process in the coolant circulating system, the above-mentioned degree of superheat will constantly rise, and during greater than second threshold value, controller cuts out first magnetic valve and second magnetic valve with control until this degree of superheat.
The big I that should be noted that the above-mentioned first threshold and second threshold value is provided with according to actual conditions, does not do further qualification at this.
The Current Temperatures of the escape pipe port of export place refrigerant of the present invention through obtaining the low pressure jar and the corresponding degree of superheat of calculation of pressure; And the part refrigerant in the coolant circulating system is separated and store according to this degree of superheat; Thereby reduced the internal circulating load of refrigerant; Can prevent effectively that liquid refrigerants from getting into compressor, and then protect compressor better.
With reference to Fig. 2, Fig. 2 is the schematic flow sheet of control method second embodiment of the air conditioner coolant circulatory system of the present invention.Based on the foregoing description, in the present embodiment, the control method of the above-mentioned air conditioner coolant circulatory system also comprises:
Step S30 when the above-mentioned degree of superheat during greater than the 3rd threshold value, inputs to the refrigerant that stores in the coolant circulating system, up to this degree of superheat less than the 4th threshold value; The 4th threshold value is less than the 3rd threshold value, greater than second threshold value.
For example, fluid reservoir is communicated with oil eliminator, and between this fluid reservoir and first tube connector, is provided with the 3rd magnetic valve; This fluid reservoir bottom is provided with second tube connector that is communicated with the low pressure jar, and this second tube connector is provided with the 4th magnetic valve.In the present embodiment, the temperature value that calculate to obtain when controller is opened the 3rd magnetic valve and the 4th magnetic valve by controller control during greater than the 3rd threshold value.Under differential pressure action, make the refrigerant in the fluid reservoir flow in the low pressure jar, and mix and be back in the coolant circulating system, thereby improve the internal circulating load of refrigerant with refrigerant in the low pressure jar through the 4th magnetic valve.After the 3rd magnetic valve and the 4th magnetic valve are opened, the above-mentioned degree of superheat will constantly reduce, and during less than the 4th threshold value, controller cuts out the 3rd magnetic valve and the 4th magnetic valve with control until this degree of superheat.
The order that should be noted that above-mentioned steps S30 and step S20 is not done further at this and is limited, and step S30 can be before step S20, also can be after step S20.The big I of above-mentioned the 3rd threshold value and the 4th threshold value is provided with according to actual conditions, does not do further qualification at this.
Present embodiment is when the degree of superheat of refrigerant is higher at the air inlet pipe port of export place of coolant circulating system mesolow jar; The refrigerant that stores is re-entered in the coolant circulating system; Make coolant circulating system can not lack and cause the overheat of compressor operation, therefore can protect compressor better because of the internal circulating load of refrigerant.
Further, the control method of the above-mentioned air conditioner coolant circulatory system also comprises: when receiving stopping signal, oil eliminator in the coolant circulating system is communicated with the low pressure jar.
In the present embodiment, when the user closes air-conditioning system, air-conditioning system will be sent a stopping signal to controller.At this moment, controller is opened second magnetic valve and the 3rd magnetic valve with control, thereby makes oil eliminator be communicated with through fluid reservoir with the low pressure jar.Gases at high pressure in the oil eliminator will arrive in the fluid reservoir through second magnetic valve, and flow in the low pressure jar through the 3rd magnetic valve, so the control method of the air conditioner coolant circulatory system that provides of the present embodiment air pressure in the balance coolant circulating system fast.When extremely starting once more owing to the air-conditioning system shutdown, need to wait for ability clean boot behind the air pressure balance in the coolant circulating system, therefore, the present invention can reduce the time of the startup wait of air-conditioning system, satisfies user's user demand more fast.
Also a kind of air-conditioning system of the present invention is used to realize said method.With reference to Fig. 3, Fig. 3 is the structural representation of first embodiment of air-conditioning system of the present invention.The air-conditioning system that present embodiment provides comprises oil eliminator 10, electric expansion valve 20, off-premises station heat exchanger 30 and low pressure jar 40, and wherein this electric expansion valve 20 is communicated with through first tube connector 301 with off-premises station heat exchanger 30; This air-conditioning system also comprises fluid reservoir 50 and controller (not shown).This fluid reservoir 50 is communicated with first tube connector 301, and between the fluid reservoir 50 and first tube connector 301, is provided with first magnetic valve 501; Fluid reservoir 50 also is communicated with low pressure jar 40, and between fluid reservoir 50 and low pressure jar 40, is provided with second magnetic valve 502, and escape pipe 401 port of export places of this low pressure jar 40 are provided with temperature sensor; The Current Temperatures that controller detects escape pipe 401 port of export place refrigerants of low pressure jar 40 according to this temperature sensor is controlled the ON/OFF of first magnetic valve 501 and second magnetic valve 502.
In the present embodiment, fluid reservoir 50 is communicated with first tube connector 301, and the pipeline that is communicated with this first tube connector 301 for example can be set at fluid reservoir 50 tops, and above-mentioned first magnetic valve 501 is arranged on this pipeline.Fluid reservoir 50 also is communicated with low pressure jar 40, and for example this fluid reservoir 50 can be provided with a pipeline at its top, and above-mentioned second magnetic valve 502 is arranged on this pipeline; This pipeline can be positioned at low pressure jar 40 the top, be communicated with this low pressure jar 40, also can be communicated with the air inlet pipe 402 of low pressure jar 40, specifically can be provided with according to actual needs, do not do further qualification at this.The escape pipe 401 that should be noted that low pressure jar 40 is communicated with the air inlet pipe 601 of compressor 60, and promptly the end that is connected with the air inlet pipe 601 of compressor 60 of the escape pipe 401 of low pressure jar 40 is escape pipe 401 ports of export of this low pressure jar 40.
Particularly; Detect the Current Temperatures of storage tank pipe 401 port of export place refrigerants of low pressure jar 40 when this temperature sensor; Pressure sensor detects the current pressure of storage tank pipe 401 port of export place refrigerants of low pressure jar 40; And should be sent to controller by current numerical value, calculate by controller and obtain the corresponding degree of superheat.When this degree of superheat during less than first threshold, this moment, the internal circulating load of decidable refrigerant was excessive, thereby controlled first magnetic valve 501 and second magnetic valve 502 is opened by controller.Owing to have the high-pressure liquid refrigerant in first tube connector 301, there is low pressure gas attitude refrigerant in the low pressure jar 40, make under the effect of pressure reduction that the part refrigerant flows in the fluid reservoir 50 through first magnetic valve 501 in the tube connector 301 of winning, and be stored in the fluid reservoir 50.In with the part refrigerant separating process in the coolant circulating system, the above-mentioned degree of superheat will constantly rise, and during greater than second threshold value, controller will control first magnetic valve 501 and second magnetic valve 502 cuts out until this degree of superheat.
Should be noted that above-mentioned first threshold less than second threshold value, the big I of this first threshold and second threshold value is provided with according to actual conditions, does not do further qualification at this.
The present invention obtains the Current Temperatures and the pressure of escape pipe 401 port of export place refrigerants of low pressure jar 40 through temperature sensor; Calculate the degree of superheat that obtains correspondence by controller; And the part refrigerant in the coolant circulating system is separated and be stored in the fluid reservoir 50 according to this degree of superheat; Thereby reduced the internal circulating load of refrigerant, can prevent effectively that liquid refrigerants from getting into compressor 60, and then protect compressor 60 better.
Further, above-mentioned fluid reservoir 50 is communicated with oil eliminator 10, and between this fluid reservoir 50 and oil eliminator 10, is provided with the 3rd magnetic valve 503; These fluid reservoir 50 bottoms are provided with second tube connector 70 that is communicated with low pressure jar 40, and this second tube connector 70 is provided with the 4th magnetic valve 504; Controller is controlled the ON/OFF of the 3rd magnetic valve 503 and the 4th magnetic valve 504 according to the above-mentioned degree of superheat.
In the present embodiment; Above-mentioned fluid reservoir 50 is communicated with oil eliminator 10, for example a pipeline can be set at the top of fluid reservoir 50, and above-mentioned the 3rd magnetic valve 503 is set on this pipeline; This pipeline can be positioned at oil eliminator 10 the top, be communicated with this oil eliminator 10; Also can be arranged on oil eliminator 10 and cross valve 80 between pipeline, be communicated with oil eliminator 10, specifically can be provided with according to actual needs, do not do further qualification at this.One end of second tube connector 70 is positioned at the bottom of fluid reservoir 50; The other end can be arranged on low pressure jar 40 the top, be connected with this low pressure jar 40; Also can be arranged on the air inlet pipe 402 of low pressure jar 40; Be communicated with the low pressure jar through air inlet pipe 402, specifically can be provided with according to actual needs, do not do further qualification at this.
Particularly, the temperature value that calculate to obtain when controller is during greater than the 3rd threshold value, controls the 3rd magnetic valve 503 and the 4th magnetic valve 504 is opened by controller.Refrigerant in the oil eliminator 10 is gases at high pressure; Refrigerant in the low pressure jar 40 is a low-pressure gas; Under differential pressure action, make the refrigerant in the fluid reservoir 50 flow in the low pressure jar through the 4th magnetic valve 504; And mix to be back in the coolant circulating system with refrigerant in the low pressure jar 40, thereby improve the internal circulating load of refrigerant.After the 3rd magnetic valve 503 and the 4th magnetic valve 504 are opened, the above-mentioned degree of superheat will constantly reduce, and during less than the 4th threshold value, controller will control the 3rd magnetic valve 503 and the 4th magnetic valve 504 cuts out until this degree of superheat.
Should be noted that above-mentioned the 4th threshold value less than the 3rd threshold value and greater than second threshold value, the big I of the 3rd threshold value and the 4th threshold value is provided with according to actual conditions, does not do further qualification at this.
Present embodiment passes through when the degree of superheat of air inlet pipe 402 port of export place refrigerants of coolant circulating system mesolow jar 40 is higher; The refrigerant that fluid reservoir 50 is stored re-enters in the coolant circulating system; Make coolant circulating system can not lack and cause the overheat of compressor operation, therefore can protect compressor better because of the internal circulating load of refrigerant.
Further, when above-mentioned controller receives stopping signal, then control second magnetic valve 502 and the 3rd magnetic valve 503 is opened.
In the present embodiment, when the user closes air-conditioning system, air-conditioning system will be sent a stopping signal to controller.At this moment, controller will control second magnetic valve 502 and the 3rd magnetic valve 503 is opened, thereby makes oil eliminator 10 be communicated with through fluid reservoir 50 with low pressure jar 40.Gases at high pressure in the oil eliminator 10 will arrive in the fluid reservoirs 50 through second magnetic valve 502, and flow in the low pressure jars 40 through the 3rd magnetic valve 503, so the air-conditioning system that provides of the present embodiment air pressure in the balance coolant circulating system fast.Because air-conditioning system is shut down in the time of need starting once more, need to wait in the coolant circulating system could start behind the air pressure balance that therefore, the present invention can reduce the time of the startup wait of air-conditioning system, satisfies user's user demand more fast.
More than be merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (8)
1. the control method of an air conditioner coolant circulatory system is characterized in that, may further comprise the steps:
Obtain the Current Temperatures and the pressure of the escape pipe port of export place refrigerant of low pressure jar, and calculate the degree of superheat that obtains correspondence;
When the said degree of superheat during less than first threshold, separate the refrigerant in the coolant circulating system, and store the refrigerant after separating, up to the said degree of superheat greater than second threshold value; Said first threshold is less than second threshold value.
2. the control method of the air conditioner coolant circulatory system as claimed in claim 1 is characterized in that, also comprises:
When the said degree of superheat during greater than the 3rd threshold value, the refrigerant that stores is inputed in the coolant circulating system, up to the said degree of superheat less than the 4th threshold value; Said the 4th threshold value is less than the 3rd threshold value and greater than said second threshold value.
3. the control method of the air conditioner coolant circulatory system as claimed in claim 2 is characterized in that, also comprises:
When receiving stopping signal, oil eliminator in the coolant circulating system is communicated with the low pressure jar.
4. air-conditioning system; Comprise oil eliminator, electric expansion valve, off-premises station heat exchanger and low pressure jar; Wherein this electric expansion valve is communicated with through first tube connector with the off-premises station heat exchanger, it is characterized in that, also comprises fluid reservoir and controller; This fluid reservoir is communicated with said first tube connector, and between the said fluid reservoir and first tube connector, is provided with first magnetic valve; Said fluid reservoir also is communicated with said low pressure jar, and between said fluid reservoir and said low pressure jar, is provided with second magnetic valve, and the escape pipe port of export of this low pressure jar is provided with temperature sensor and pressure sensor; Said controller is according to the Current Temperatures of the escape pipe port of export place refrigerant of said temperature sensor and pressure sensor detection low pressure jar and the ON/OFF that pressure is controlled said first magnetic valve and second magnetic valve.
5. air-conditioning system as claimed in claim 4 is characterized in that, said controling appliance body is used for: obtain the degree of superheat according to said Current Temperatures and calculation of pressure, when this degree of superheat during less than first threshold, will control said first magnetic valve and second magnetic valve and open; And, will control said first magnetic valve and second closed electromagnetic valve when this degree of superheat during greater than second threshold value; Said first threshold is less than second threshold value.
6. air-conditioning system as claimed in claim 5 is characterized in that said fluid reservoir is communicated with oil eliminator, and between this fluid reservoir and said oil eliminator, is provided with the 3rd magnetic valve; This fluid reservoir bottom is provided with second tube connector that is communicated with said low pressure jar, and this second tube connector is provided with the 4th magnetic valve; Said controller also is used for, and controls the ON/OFF of said the 3rd magnetic valve and the 4th magnetic valve according to the said degree of superheat.
7. air-conditioning system as claimed in claim 6 is characterized in that, said controling appliance body is used for:
When the said degree of superheat during, will control said the 3rd magnetic valve and the 4th magnetic valve and open greater than the 3rd threshold value; And, will control said the 3rd magnetic valve and the 4th closed electromagnetic valve when this degree of superheat during less than the 4th threshold value; Said the 3rd threshold value is greater than said first threshold; Said the 4th threshold value is less than the 3rd threshold value and greater than said second threshold value.
8. air-conditioning system as claimed in claim 7 is characterized in that, said controller also is used for: when said controller receives stopping signal, then control said second magnetic valve and the 3rd magnetic valve and open.
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| CN201210260907.2A CN102788402B (en) | 2012-07-26 | 2012-07-26 | Control method of air conditioning refrigerant circulation system and air conditioning system |
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| CN201210260907.2A CN102788402B (en) | 2012-07-26 | 2012-07-26 | Control method of air conditioning refrigerant circulation system and air conditioning system |
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| CN109114749A (en) * | 2018-07-04 | 2019-01-01 | 青岛海尔空调器有限总公司 | Control method and device for air-conditioning system |
| CN109114749B (en) * | 2018-07-04 | 2021-05-28 | 青岛海尔空调器有限总公司 | Control method and device for air conditioning system |
| CN113983637A (en) * | 2021-10-27 | 2022-01-28 | 珠海格力电器股份有限公司 | Air conditioner refrigerant circulation loop refrigerant quantity control method and device and air conditioner |
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| CN102788402B (en) | 2014-11-26 |
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