CN102506490B - Control method for electronic expansion valve of indoor unit during refrigeration of inverter multi-split air conditioner - Google Patents
Control method for electronic expansion valve of indoor unit during refrigeration of inverter multi-split air conditioner Download PDFInfo
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Abstract
The invention discloses a control method for an electronic expansion valve of an indoor unit during refrigeration of an inverter multi-split air conditioner. The method comprises the following steps of: (1) judging whether microprocessors of the indoor units (8) are positioned in a heating standby state; (2) adjusting the opening of corresponding indoor electronic expansion valves (7) to the opening of 30 to 50 steps through the microprocessor; and (3) keeping the opening of the indoor electronic expansion valves (7) in the step (2) for 2 to 6 minutes, adjusting the opening of the corresponding indoor electronic expansion valves (7) once every 15 to 35 seconds through the microprocessors according to temperature returned by a liquid tube temperature sensor (9) and an indoor heat exchanger coil temperature sensor (11) by the following rules: the opening of the indoor electronic expansion valve (7) after adjustment is equal to the sum of an opening before the adjustment and the adjusted opening; and the adjusted opening is equal to (T2-T1-A)*E+delta(T2-T1)*F. Compared with the conventional method, the invention has the characteristics that: the method is suitable for multi-split air conditioners, the stable operation of the system can be effectively guaranteed, the heating efficiency of the system is improved, and energy consumption is low; meanwhile, indoor ambient temperature variation has a narrow range, and an indoor environment has a high comfort level.
Description
Technical field
The present invention relates to a control method of dragging changeable frequency indoor apparatus of air conditioner electric expansion valve, particularly relate to a kind ofly while being applied to the indoor set refrigerating operaton, one drags the control method of changeable frequency indoor apparatus of air conditioner electric expansion valve.
Background technology
One drags changeable frequency air-conditioner, an outer machine can move by the dragging multiple indoor set, not only saved the installing space of off-premises station, and there is system simple, compact conformation, comfortable are installed, operation is independently regulated in each room, the advantages such as energy meets the not different air conditioner load requirements of chummery, and comprehensive coefficient of performance is high, energy-conservation.Along with expanding economy, one drags changeable frequency heat pump air conditioner, and the use in family is more and more extensive at home.
" method of air-conditioning and its electric expansion valve of control " that the patent No. is 20071012061.7 proposed a kind of proportion differential algorithm of controlling for one-to-one varying capacity system electronic expansion valve, the degree of superheat numerical value of this algorithm electric expansion valve is a fixed value, when if excessive situation appears in the fixed value of setting, increased like this circulation of the indoor set gaseous coolant of heating standby operation, gaseous coolant turns back to the fluid reservoir of off-premises station by the indoor electronic expansion valve, increased the enthalpy of refrigerant in fluid reservoir, heat absorption capacity after the throttling of refrigerant in the reduction fluid reservoir, thereby make the efficiency of machine system reduce, when if too small situation appears in the fixed value of setting, cold-producing medium in unit will be deposited in the indoor set of standby gradually like this, cause the cold-producing medium circulated in system to lack, and occur that compressor exhaust temperature crosses high fault, energy consumption is higher, finally make the life-span of air-conditioner shorter, therefore can not effectively be suitable for the multi-split air conditioner that load is larger, and " control method of electric expansion valve " that the patent No. is 200710090097.x proposed a kind of fuzzy algorithmic approach, but the initial adjusting range of electric expansion valve is larger in this method, but also define the change of the degree of superheat according to the delivery temperature of off-premises station, make the heat exchange amount of heat exchanger limited, and then make delivery temperature higher, very easily cause air-conditioner the situation of newspaper fault or shutdown to occur, operation stability is poor, make again the indoor environment temperature excursion larger simultaneously, the comfort level of indoor environment is lower, can not better adapt to multi-split air conditioner.
Therefore the control method of the indoor set electric expansion valve of prior art all is not suitable for multi-split air conditioner.
Summary of the invention
The present invention is directed to above problem a kind of applicable multi-split air conditioner is provided, can effectively guarantee system run all right, and the raising system heats usefulness, energy consumption is lower, make again the indoor environment temperature excursion less, the control method of the electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating that the comfort level of indoor environment is higher simultaneously.
The present invention overcomes the above problems technical scheme used: the control method of a kind of one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating comprises the following steps:
(1), indoor set is while entering refrigeration mode, by the microprocessor of this indoor set and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set, starts compressor, off-premises station and indoor set enter refrigeration control; If off-premises station belongs to the refrigerating operaton state, indoor set directly enters refrigeration control; When if off-premises station belongs to the heating operation state, after compressor shutdown is restarted, off-premises station and indoor set enter refrigeration control again;
(2), the aperture of 30～50 steps is transferred to the aperture of corresponding indoor electronic expansion valve by microprocessor;
(3), the indoor electronic expansion valve in step, the aperture in (2) keeps 2～6min(min to be minute), the temperature that the every 15～35S of microprocessor passes back according to liquid pipe temperature sensor and indoor heat exchanger coil temperature sensor, the aperture of corresponding indoor electronic expansion valve is regulated once by following principle:
The temperature of setting liquid pipe temperature sensor measurement is T1, and the temperature that setting indoor heat exchanger coil temperature sensor is measured is T2, and the temperature of setting compressor exhaust temperature sensor mensuration is Td, and the temperature of setting outdoor heat exchanger condensation temperature sensor mensuration is Tc;
Aperture after the indoor electronic expansion valve is regulated=this regulates the aperture of front aperture+this adjusting
The aperture of this adjusting=(T2-T1-A) * E+ Δ (T2-T1) * F
Δ (T2-T1) is the variable quantity of the degree of superheat, and (T2-T1) value that equals this detection deducts (T2-T1) value of front one-time detection;
The value that E, F are integer is according to following principle:
The value of absolute value E=(T2-T1-A)/2, by the integer that rounds up and obtain;
The value of the absolute value of F=Δ (T2-T1)/3, by the integer that rounds up and obtain;
A=A0+ Δ SH; The initial target degree of superheat that A0 is indoor set is constant, is generally 2～4 ℃, and the A0 value of the indoor set of different model air-conditioner is different;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; The indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 2～6min detects the temperature T d of compressor exhaust temperature sensor and the temperature T c of outdoor heat exchanger condensation temperature sensor, according to following rule, controls Δ SH:
If principle is Td-Tc≤20 ℃ 1., Δ SH=Δ SH ＇+1;
If principle is Td 2. > 93 ℃, Δ SH=Δ SH ＇-1;
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
Described step (2) in, corresponding indoor electronic expansion valve is transferred to the aperture of 40 steps.
Described step (3) middle aperture keeps 4min.
Described A0 is 2 ℃.
The frequency of the temperature T c of the temperature T d of described detection compressor exhaust temperature sensor and outdoor heat exchanger condensation temperature sensor be every 4min once.
After adopting above method, the present invention compared with prior art, due to the characteristics according to multi-split air conditioner, increased by the variation of the degree of superheat and the temperature T d of compressor exhaust temperature sensor and the temperature T c of outdoor heat exchanger condensation temperature sensor and judged, carry out the aperture of electric expansion valve in conditioning chamber according to different situations, can effectively prevent that the situation that aperture is too small or excessive from appearring in the indoor electronic expansion valve, can effectively guarantee system run all right, and the raising system heats usefulness, energy consumption is lower, make the change curve of indoor electronic expansion valve opening more approach the change curve of the indoor electronic expansion valve opening under desirable state of a control, and then make also less of indoor environment temperature excursion, the comfort level of indoor environment is higher.
The accompanying drawing explanation
The systematic schematic diagram that accompanying drawing is the present invention one control method of indoor set electric expansion valve while dragging changeable frequency air conditioner refrigerating.
As shown in the figure: 1, compressor, 101, the compressor exhaust temperature sensor, 2, gas-liquid separator, 3, cross valve, 4, outdoor unit heat exchanger, 401, outdoor heat exchanger condensation temperature sensor, 5, outdoor electric expansion valve and check valve assembly, 6, reservoir, 7, indoor electronic expansion valve, 8, indoor set, 9, liquid pipe temperature sensor, 10, indoor environment temperature sensor, 11, the indoor heat exchanger coil temperature sensor.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
As shown in drawings, an off-premises station is provided with the indoor set 8 of a plurality of parallel connections and the pipeline of interior electric expansion valve 7 compositions of its respective chamber/chambers.During the frequency conversion heat pump operation of air conditioner, the gases at high pressure that compressor 1 is discharged enter indoor set 8 through cross valve 3 and carry out condensation, after condensation, liquid is through the laggard reservoir 6 that enters outdoor unit of the suitable adjusting of indoor electronic expansion valve 7, after entering reservoir 6, need through outdoor electric expansion valve 5, outdoor electric expansion valve 5 is controlled by microprocessor, to reservoir 6, refrigerant out carries out throttling, gas-liquid mixed refrigerant after throttling enters outdoor unit heat exchanger 4 and is evaporated, again through cross valve 3 commutations, enter gas-liquid separator 2, gas after gas-liquid separator 2 separates enters compressor 1 recompression, thereby complete a heat pump cycle.Wherein compressor 1 blast pipe is provided with compressor exhaust temperature sensor 101, outdoor unit heat exchanger 4 is provided with outdoor heat exchanger condensation temperature sensor 401, be respectively equipped with liquid pipe temperature sensor 9 and indoor heat exchanger coil temperature sensor 11 on pipeline between indoor set 8 one ends indoor electronic expansion valve 7 corresponding thereto and heat exchange coil, be used for gathering the temperature data of pipeline and heat exchanger dish; Indoor set 8 is provided with indoor environment temperature sensor 10, is used for gathering the data of indoor temperature.Indoor electronic expansion valve 7 pipelines that other indoor set 8 in parallel is corresponding with it are same as described above.In accompanying drawing, also have the accessory of some systems not show.
Below to take the wherein pipeline of the indoor set 8 indoor electronic expansion valve 7 corresponding thereto on a road be example:
The control method of a kind of one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to the refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to the heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 30 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 6min to indoor electronic expansion valve 7, the temperature that the every 35S of microprocessor passes back according to liquid pipe temperature sensor 9 and indoor heat exchanger coil temperature sensor 11, the aperture of corresponding indoor electronic expansion valve 7 is regulated once by following principle:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 11 mensuration is T2, the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td, and the temperature of setting outdoor heat exchanger condensation temperature sensor 401 mensuration is Tc;
Aperture after indoor electronic expansion valve 7 is regulated=this regulates the aperture of front aperture+this adjusting
The aperture of this adjusting=(T2-T1-A) * E+ Δ (T2-T1) * F
Δ (T2-T1) is the variable quantity of the degree of superheat, and (T2-T1) value that equals this detection deducts (T2-T1) value of front one-time detection;
The value that E, F are integer is according to following principle:
The value of absolute value E=(T2-T1-A)/2, by the integer that rounds up and obtain;
The value of the absolute value of F=Δ (T2-T1)/3, by the integer that rounds up and obtain;
A=A0+ Δ SH; The initial target degree of superheat that A0 is indoor set is constant, and A0 is 4 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; The indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 6min detects the temperature T d of compressor exhaust temperature sensor 101 and the temperature T c of outdoor heat exchanger condensation temperature sensor 401, according to following rule, controls Δ SH:
If principle is Td-Tc≤20 ℃ 1., Δ SH=Δ SH ＇+1;
If principle is Td 2. > 93 ℃, Δ SH=Δ SH ＇-1;
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
The control method of a kind of one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to the refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to the heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 50 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 2min to indoor electronic expansion valve 7, the temperature that the every 25S of microprocessor passes back according to liquid pipe temperature sensor 9 and indoor heat exchanger coil temperature sensor 11, the aperture of corresponding indoor electronic expansion valve 7 is regulated once by following principle:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 11 mensuration is T2, the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td, and the temperature of setting outdoor heat exchanger condensation temperature sensor 401 mensuration is Tc;
Aperture after indoor electronic expansion valve 7 is regulated=this regulates the aperture of front aperture+this adjusting
The aperture of this adjusting=(T2-T1-A) * E+ Δ (T2-T1) * F
Δ (T2-T1) is the variable quantity of the degree of superheat, and (T2-T1) value that equals this detection deducts (T2-T1) value of front one-time detection;
The value that E, F are integer is according to following principle:
The value of absolute value E=(T2-T1-A)/2, by the integer that rounds up and obtain;
The value of the absolute value of F=Δ (T2-T1)/3, by the integer that rounds up and obtain;
A=A0+ Δ SH; The initial target degree of superheat that A0 is indoor set is constant, and A0 is 3 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; The indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 2min detects the temperature T d of compressor exhaust temperature sensor 101 and the temperature T c of outdoor heat exchanger condensation temperature sensor 401, according to following rule, controls Δ SH:
If principle is Td-Tc≤20 ℃ 1., Δ SH=Δ SH ＇+1;
If principle is Td 2. > 93 ℃, Δ SH=Δ SH ＇-1;
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
The control method of a kind of one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating comprises the following steps:
(1), indoor set 8 is while entering refrigeration mode, by the microprocessor of this indoor set 8 and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set 8, starts compressor 1, off-premises station and indoor set 8 enter refrigeration control; If off-premises station belongs to the refrigerating operaton state, indoor set 8 directly enters refrigeration control; When if off-premises station belongs to the heating operation state, after compressor 1 is shut down and restarted, off-premises station and indoor set 8 enter refrigeration control again;
(2), the aperture of 40 steps is transferred to the aperture of corresponding indoor electronic expansion valve 7 by microprocessor;
(3), in step, the aperture in (2) keeps 4min to indoor electronic expansion valve 7, the temperature that the every 15S of microprocessor passes back according to liquid pipe temperature sensor 9 and indoor heat exchanger coil temperature sensor 11, the aperture of corresponding indoor electronic expansion valve 7 is regulated once by following principle:
The temperature of setting liquid pipe temperature sensor 9 mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor 11 mensuration is T2, the temperature of setting compressor exhaust temperature sensor 101 mensuration is Td, and the temperature of setting outdoor heat exchanger condensation temperature sensor 401 mensuration is Tc;
Aperture after indoor electronic expansion valve 7 is regulated=this regulates the aperture of front aperture+this adjusting
The aperture of this adjusting=(T2-T1-A) * E+ Δ (T2-T1) * F
Δ (T2-T1) is the variable quantity of the degree of superheat, and (T2-T1) value that equals this detection deducts (T2-T1) value of front one-time detection;
The value that E, F are integer is according to following principle:
The value of absolute value E=(T2-T1-A)/2, by the integer that rounds up and obtain;
The value of the absolute value of F=Δ (T2-T1)/3, by the integer that rounds up and obtain;
A=A0+ Δ SH; The initial target degree of superheat that A0 is indoor set is constant, and A0 is 2 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; The indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 4min detects the temperature T d of compressor exhaust temperature sensor 101 and the temperature T c of outdoor heat exchanger condensation temperature sensor 401, according to following rule, controls Δ SH:
If principle is Td-Tc≤20 ℃ 1., Δ SH=Δ SH ＇+1;
If principle is Td 2. > 93 ℃, Δ SH=Δ SH ＇-1;
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
Above embodiment is only preferred embodiment of the present invention, and the present invention is not limited only to above embodiment and has also allowed other structural change, allly in rights to independence claimed range of the present invention, changes, and all belongs to protection domain of the present invention.
Claims (5)
1. the control method of the electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating is characterized in that: comprise the following steps:
(1), indoor set (8) is while entering refrigeration mode, by the microprocessor of this indoor set (8) and the controller of off-premises station, carries out communication, determines the running status of off-premises station; If off-premises station, in stopped status, according to the load of indoor set (8), starts compressor (1), off-premises station and indoor set (8) enter refrigeration control; If off-premises station belongs to the refrigerating operaton state, indoor set (8) directly enters refrigeration control; When if off-premises station belongs to the heating operation state, after compressor (1) is shut down and restarted, off-premises station and indoor set (8) enter refrigeration control again;
(2), the aperture of 30～50 steps is transferred to the aperture of corresponding indoor electronic expansion valve (7) by microprocessor;
(3), in step, the aperture in (2) keeps 2～6min to indoor electronic expansion valve (7), the temperature that the every 15～35S of microprocessor passes back according to liquid pipe temperature sensor (9) and indoor heat exchanger coil temperature sensor (11), the aperture of corresponding indoor electronic expansion valve (7) is regulated once by following principle:
The temperature of setting liquid pipe temperature sensor (9) mensuration is T1, the temperature of setting indoor heat exchanger coil temperature sensor (11) mensuration is T2, the temperature of setting compressor exhaust temperature sensor (101) mensuration is Td, and the temperature of setting outdoor heat exchanger condensation temperature sensor (401) mensuration is Tc;
Aperture after indoor electronic expansion valve (7) is regulated=this regulates the aperture of front aperture+this adjusting
The aperture of this adjusting=(T2-T1-A) * E+ Δ (T2-T1) * F
Δ (T2-T1) is the variable quantity of the degree of superheat, and (T2-T1) value that equals this detection deducts (T2-T1) value of front one-time detection;
The value that E, F are integer is according to following principle:
The value of absolute value E=(T2-T1-A)/2, by the integer that rounds up and obtain;
The value of the absolute value of F=Δ (T2-T1)/3, by the integer that rounds up and obtain;
A=A0+ Δ SH; The initial target degree of superheat that A0 is indoor set is constant, is generally 2～4 ℃;
Δ SH is the degree of superheat correction of off-premises station to indoor set, and initial value is 0; The indoor set microprocessor is by communicating by letter and can obtain Δ SH with off-premises station;
After off-premises station is stable, every 2～6min detects the temperature T d of compressor exhaust temperature sensor (101) and the temperature T c of outdoor heat exchanger condensation temperature sensor (401), according to following rule, controls Δ SH:
If principle is Td-Tc≤20 ℃ 1., Δ SH=Δ SH ＇+1;
If principle is Td>93 ℃ 2., Δ SH=Δ SH ＇-1;
Δ SH ＇ is that last indoor set microprocessor is by the Δ SH value of communicating by letter with off-premises station and obtaining.
2. the control method of according to claim 1 one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating is characterized in that: described step (2) in, corresponding indoor electronic expansion valve (7) is transferred to the aperture of 40 steps.
3. the control method of according to claim 1 one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating is characterized in that: described step (3) in aperture keep 4min.
4. the control method of according to claim 1 one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating, it is characterized in that: described A0 is 2 ℃.
5. the control method of according to claim 1 one electric expansion valve of indoor set while dragging changeable frequency air conditioner refrigerating is characterized in that: the frequency of the temperature T c of the temperature T d of described detection compressor exhaust temperature sensor (101) and outdoor heat exchanger condensation temperature sensor (401) be every 4min once.
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| KR100757442B1 (en) * | 2005-12-29 | 2007-09-11 | 엘지전자 주식회사 | Air conditioner |
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Address after: 315191 Zhejiang city of Ningbo province Yinzhou District Jiangshan town Light Road No. 1166 Patentee after: NINGBO AUX ELECTRIC CO., LTD. Address before: 315191 Zhejiang city of Ningbo province Yinzhou District Jiangshan town Light Road No. 1166 Patentee before: Ningbo AUX Electric Co., Ltd. |