CN101995125B - Methods for controlling and amending multi-split air conditioner expansion valve - Google Patents
Methods for controlling and amending multi-split air conditioner expansion valve Download PDFInfo
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- CN101995125B CN101995125B CN201010001801.1A CN201010001801A CN101995125B CN 101995125 B CN101995125 B CN 101995125B CN 201010001801 A CN201010001801 A CN 201010001801A CN 101995125 B CN101995125 B CN 101995125B
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Abstract
The invention discloses one method for controlling and amending a multi-split air conditioner expansion valve, which comprises the following steps of: judging whether the degree of superheat is smaller than a first temperature; if yes, amending the degree of supercooling; if not, further judging whether the degree of superheat is smaller than a second temperature; if yes, adjusting the degree of supercooling to the standard degree of supercooling; and if not, maintaining the degree of supercooling. In addition, the invention also discloses another method for controlling and amending the multi-split air conditioner expansion valve, which comprises the following steps of: judging whether the degree of superheat is smaller than a fourth temperature; if yes, amending the degree of supercooling; if not, further judging whether the degree of superheat is smaller than a third temperature; if yes, maintaining the degree of supercooling unchanged; and if not, amending the degree of supercooling. The invention can prevent liquid return phenomenon by amending the degree of supercooling or can prevent quick, severe and non-uniform frosting caused by too small opening of the expansion valve from influencing heating capacity when a long pipe is singly used for heating.
Description
Technical field
The present invention relates to air-conditioner field, particularly relate to a kind of control and modification method of multi-split air conditioner expansion valve.
Background technology
Expansion valve is to make spool produce continuous dislocation by means such as stepper motors, thereby changes the throttling arrangement of cold-producing medium circulation area, by controlling the degree of superheat of evaporator outlet gaseous refrigerant, controls the refrigerant flow that enters evaporimeter.Expansion valve is comprised of induction mechanism, executing agency, guiding mechanism and valve body.In induction mechanism, fill refrigeration (freon) working medium, temperature-sensitive bag is arranged on evaporator outlet place.Because affecting between ，Qi exit temperature and evaporating temperature of the degree of superheat exists the temperature difference, be commonly referred to the degree of superheat.Temperature-sensitive bag is experienced after evaporator outlet temperature, makes whole induction system in corresponding saturation pressure Pb, and this pressure will be passed to push rod by diaphragm.Diaphragm on pressure chamber top only has Pb to exist, there is elastic force Pt and the evaporating pressure P0 that adjusts spring the below of diaphragm, three has Pb=Pt+Po when balance, when Pb > Pt+Po, represent that evaporimeter thermic load is bigger than normal, the outlet degree of superheat is higher, by diaphragm, to push rod, transmit this pressure signal, spool is moved down, and expansion valve is opened and is become large, and refrigerant flow increases in proportion.Otherwise expansion valve is opened and diminished, refrigerant flow reduces in proportion.The degree of superheat (degree ofsuperheat) refers to the poor of the overtemperature of cold-producing medium under identical evaporating pressure and saturation temperature.Degree of supercooling (subcooled temperature) refers to: condensation of refrigerant is liquid, proceed cooling, excessively cold, the difference of liquid actual temperature (condensation temperature) and saturation temperature.
Existing one drags many air-conditionings as shown in Figure 1, compressor 1 is connected with many extra heavy pipes 3 by cross valve 2, each extra heavy pipe is all connected with each indoor heat exchanger respectively, and Fig. 1 drags three air-conditioners, comprises three extra heavy pipes 3, three extra heavy pipes 3 are connected with three indoor heat exchangers 4,5,6 respectively, three indoor heat exchangers 4,5,6 are connected with electric expansion valve 8 by three tubules 7, and electric expansion valve 8 is connected with outdoor heat exchanger 9, last, outdoor heat exchanger 9 is connected with cross valve 2, forms loop.Wherein, T1, T2, T3 represent the temperature of three extra heavy pipe 3 place's refrigerants, T4, T5, T6 represent the temperature of three tubule 7 place's refrigerants, T7, T8, T9 represent the temperature at three indoor heat exchanger 4,5,6 places, T10 represents the temperature at indoor heat exchanger place, temperature when T11 represents that refrigerant enters compressor.During refrigeration control, Δ T1=T1-T6, Δ T2=T2-T5, Δ T3=T3-T4, sets different Δ T desired values, and the aperture by variable expansion valve, reaches desired value; Refrigeration adopts this kind of way conventionally, can meet the demands.Heat while controlling, Δ T1=T7-T6, Δ T2=T8-T5, Δ T3=T9-T4, sets different Δ T values, and the aperture by variable expansion valve, reaches desired value.When heating, if merely by controlling Δ T value, under the different temperatures of machine, or in the different situation of piping length, the reliability of machine can not be guaranteed, and has following defect: heat frosting when many, liquid can occur back or liquid phenomenon occurs back short pipe arrangement; When long pipe arrangement unit heats, expansion valve opening is too small, and frosting is fast, and frosting is serious and inhomogeneous, affects heating capacity.
Summary of the invention
The object of this invention is to provide and a kind ofly prevent from heating frosting when many, there is back liquid phenomenon, or prevent that short pipe arrangement unit from liquid phenomenon occurring back while heating, or when long pipe arrangement unit heats, preventing that expansion valve opening is too small causes that frosting is fast, frosting is serious and inhomogeneous, affects control and the modification method of the multi-split air conditioner expansion valve of heating capacity.
For achieving the above object, on the one hand, technical scheme of the present invention provides a kind of control and modification method of multi-split air conditioner expansion valve, said method comprising the steps of:
S101, judges whether the degree of superheat is less than the first temperature, if so, goes to step S102, if not, goes to step S103;
S102, revises degree of supercooling;
S103, judges whether the degree of superheat is greater than the second temperature, if so, goes to step S105, if not, goes to step S104;
S104, degree of supercooling is not revised, and keeps degree of supercooling;
S105, degree of supercooling is adjusted into standard degree of supercooling.
Wherein, in described step S102, by following steps, degree of supercooling is revised:
The week very first time after date that every process is fixing, degree of supercooling increases by 1 ℃.
Wherein, the number of times that described degree of supercooling increases is got the integer-bit of the difference of described the second temperature and the first temperature.
Wherein, the described fixing cycle very first time is 1 minute.
Wherein, described the first temperature is-3 ℃; Described the second temperature is 1 ℃.
On the other hand, technical scheme of the present invention also provides a kind of control and modification method of multi-split air conditioner expansion valve, said method comprising the steps of:
S106, judges whether the degree of superheat is greater than the 4th temperature, if so, goes to step S107, if not, goes to step S108;
S107, lowers correction to degree of supercooling;
S108, judges whether the degree of superheat is greater than the 3rd temperature, if so, goes to step S109, if not, goes to step S110;
S109, keeps degree of supercooling constant;
S110, raises correction to degree of supercooling.
Wherein, in described step S107, by following steps, degree of supercooling is lowered to correction:
Every after the 3rd fixing time cycle, degree of supercooling reduces by 1 ℃.
Wherein, in described step S110, by following steps, degree of supercooling is raised to correction:
Every after the second fixing time cycle, degree of supercooling increases by 1 ℃, and degree of supercooling maximum is increased to standard degree of supercooling.
Wherein, described the second fixing time cycle or described the 3rd fixing time cycle are 1 minute.
Wherein, described the 3rd temperature is 6 ℃; Described the 4th temperature is 2 ℃.
Technique scheme tool has the following advantages: by degree of supercooling is revised, can prevent from heating frosting when many, there is back liquid phenomenon, or prevent that short pipe arrangement unit from liquid phenomenon occurring back while heating, or when long pipe arrangement unit heats, preventing that expansion valve opening is too small causes that frosting is fast, frosting is serious and inhomogeneous, affects heating capacity.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of multi-split air conditioner of prior art;
Fig. 2 is a kind of control of multi-split air conditioner expansion valve and the flow chart of modification method of the embodiment of the present invention;
Fig. 3 is the control of another multi-split air conditioner expansion valve and the flow chart of modification method of the embodiment of the present invention;
Fig. 4 is that the degree of superheat and the degree of supercooling correction of a kind of multi-split air conditioner expansion valve of the embodiment of the present invention is related to corresponding diagram;
Fig. 5 is that the degree of superheat and the degree of supercooling correction of another multi-split air conditioner expansion valve of the embodiment of the present invention is related to corresponding diagram.
Wherein, 1: compressor; 2: cross valve; 3: extra heavy pipe; 4,5,6: indoor heat exchanger; 7: tubule; 8: electric expansion valve; 9: outdoor heat exchanger.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 2, when degree of superheat temperature is too low, control and the modification method of multi-split air conditioner expansion valve of the present invention comprise the following steps:
S101, judges whether the degree of superheat is less than the first temperature, if so, goes to step S102, if not, goes to step S103;
S102, revises degree of supercooling, the week very first time after date that every process is fixing, and degree of supercooling increases by 1 ℃, and the number of times that degree of supercooling increases is poor (round numbers) of the second temperature and the first temperature;
S103, judges whether the degree of superheat is greater than the second temperature, if so, goes to step S105, if not, goes to step S104;
S104, degree of supercooling is not revised, and keeps degree of supercooling;
S105, degree of supercooling is adjusted into standard degree of supercooling.Standard degree of supercooling refers to the degree of supercooling arranging when air-conditioner dispatches from the factory, technical staff can be that every air-conditioner arranges degree of supercooling according to the characteristic of air-conditioner and environment for use, although it is in most of the cases all more applicable that this degree of supercooling numerical value is considered, but in specific situation, need to revise, that is, need to revise by said method.
As shown in Figure 3, when degree of superheat excess Temperature, control and the modification method of multi-split air conditioner expansion valve of the present invention comprise the following steps:
S106, judges whether the degree of superheat is greater than the 4th temperature, if so, goes to step S107, otherwise, go to step S108;
S107, every after the 3rd fixing time cycle, degree of supercooling reduces by 1 ℃, and the number of times that degree of supercooling reduces is poor (round numbers) of the 4th temperature and the second temperature.
S108, judges whether the degree of superheat is greater than the 3rd temperature, if so, goes to step S109, if not, goes to step S110;
S109, keeps degree of supercooling constant;
S110, every after the second fixing time cycle, degree of supercooling increases by 1 ℃, and degree of supercooling maximum is increased to standard degree of supercooling.
The first temperature in said method, the second temperature, the 3rd temperature, the 4th temperature, the cycle very first time, the second time cycle and the 3rd time cycle can arrange according to specific circumstances, situation during air-conditioner different, settings may be different, but those skilled in the art can according to air-conditioner need not require arrange.
Below in conjunction with instantiation, describe, in conjunction with Fig. 1, degree of superheat SH=T11-T10, as shown in Figure 4, when degree of superheat SH is during lower than-3 ℃ (first temperature), automatically degree of supercooling is revised, (the cycle very first time) per minute revises 1 ℃, and degree of supercooling adds 1 ℃, increases at most 4 times.When SH is between-3 ℃ and 1 ℃ (second temperature) time, degree of supercooling keeps, and when SH is greater than 1 ℃, degree of supercooling is modified to standard degree of supercooling.
As shown in Figure 5, when degree of superheat SH is greater than 6 ℃ (the 4th temperature), degree of supercooling (the 3rd time cycle) per minute reduces 1 ℃, and minimum degree of supercooling is 1 ℃, when SH is 2 ℃ (the 3rd temperature) and between 6 ℃, keeps degree of supercooling; SH is during lower than 2 ℃, and degree of supercooling (the second time cycle) per minute increases by 1 ℃, and maximum subcooled temperature is standard degree of supercooling.
As can be seen from the above embodiments, the embodiment of the present invention is by revising degree of supercooling, can prevent from heating frosting when many, there is back liquid phenomenon, or prevent that short pipe arrangement unit from liquid phenomenon occurring back while heating, or when long pipe arrangement unit heats, prevent from that expansion valve opening is too small to cause that frosting is fast, frosting is serious and inhomogeneous, affect heating capacity.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. the control of multi-split air conditioner expansion valve and a modification method, is characterized in that, said method comprising the steps of:
S101, judges whether the degree of superheat is less than the first temperature, if so, goes to step S102, if not, goes to step S103;
S102, revises degree of supercooling;
S103, judges whether the degree of superheat is greater than the second temperature, if so, goes to step S105, if not, goes to step S104;
S104, degree of supercooling is not revised, and keeps degree of supercooling;
S105, degree of supercooling is adjusted into standard degree of supercooling.
2. the control of multi-split air conditioner expansion valve as claimed in claim 1 and modification method, is characterized in that, in described step S102, by following steps, degree of supercooling revised:
The week very first time after date that every process is fixing, degree of supercooling increases by 1 ℃.
3. the control of multi-split air conditioner expansion valve as claimed in claim 2 and modification method, is characterized in that, the number of times that described degree of supercooling increases is got the integer-bit of the difference of described the second temperature and the first temperature.
4. the control of multi-split air conditioner expansion valve as claimed in claim 2 and modification method, is characterized in that, the described fixing cycle very first time is 1 minute.
5. the control of multi-split air conditioner expansion valve as claimed in claim 1 and modification method, is characterized in that, described the first temperature is-3 ℃; Described the second temperature is 1 ℃.
6. the control of multi-split air conditioner expansion valve and a modification method, is characterized in that, said method comprising the steps of:
S106, judges whether the degree of superheat is greater than the 4th temperature, if so, goes to step S107, if not, goes to step S108;
S107, lowers correction to degree of supercooling;
S108, judges whether the degree of superheat is greater than the 3rd temperature, if so, goes to step S109, if not, goes to step S110;
S109, keeps degree of supercooling constant;
S110, raises correction to degree of supercooling.
7. the control of multi-split air conditioner expansion valve as claimed in claim 6 and modification method, is characterized in that, in described step S107, by following steps, degree of supercooling lowered to correction:
Every after the 3rd fixing time cycle, degree of supercooling reduces by 1 ℃.
8. the control of multi-split air conditioner expansion valve as claimed in claim 6 and modification method, is characterized in that, in described step S110, by following steps, degree of supercooling raised to correction:
Every after the second fixing time cycle, degree of supercooling increases by 1 ℃, and degree of supercooling maximum is increased to standard degree of supercooling.
9. the control of multi-split air conditioner expansion valve as claimed in claim 7 and modification method, is characterized in that, described the 3rd fixing time cycle is 1 minute.
10. the control of multi-split air conditioner expansion valve as claimed in claim 8 and modification method, is characterized in that, described the second fixing time cycle is 1 minute.
The control of 11. multi-split air conditioner expansion valves as claimed in claim 6 and modification method, is characterized in that, described the 4th temperature is 6 ℃; Described the 3rd temperature is 2 ℃.
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| CN201010001801.1A CN101995125B (en) | 2009-08-10 | 2010-01-05 | Methods for controlling and amending multi-split air conditioner expansion valve |
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| CN200910090352 | 2009-08-10 | ||
| CN200910090352.X | 2009-08-10 | ||
| CN201010001801.1A CN101995125B (en) | 2009-08-10 | 2010-01-05 | Methods for controlling and amending multi-split air conditioner expansion valve |
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| CN101995125B true CN101995125B (en) | 2014-01-15 |
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| CN103968629B (en) * | 2013-02-04 | 2016-04-06 | 珠海格力电器股份有限公司 | Falling film type handpiece Water Chilling Units and control method thereof |
| CN103982987B (en) * | 2014-05-07 | 2016-08-31 | 广东美的暖通设备有限公司 | Prevent the method and system of coolant bias current, multi-connected air conditioner in multi-connected air conditioner |
| CN104697121B (en) * | 2015-03-27 | 2017-06-06 | 广东美的暖通设备有限公司 | The control method and multiple on-line system of indoor set in multiple on-line system |
| CN106524338B (en) * | 2016-11-25 | 2019-05-31 | 广东美的暖通设备有限公司 | Multi-line system and its supercooling circuit valve body control method |
| CN107421176B (en) * | 2017-06-28 | 2019-07-23 | 珠海格力电器股份有限公司 | The control method and heat pump system of electric expansion valve |
| CN108105912B (en) * | 2017-12-11 | 2019-11-29 | 广东美的暖通设备有限公司 | Multi-line system and its anti-refrigerant bias current control method, control device |
| CN109099612A (en) * | 2018-08-17 | 2018-12-28 | 珠海格力电器股份有限公司 | Heat-pump apparatus and its control method for electronic expansion valve, device and storage medium |
| CN109114757A (en) * | 2018-10-08 | 2019-01-01 | 广东美的暖通设备有限公司 | Air conditioner system control method |
| CN113819570B (en) * | 2021-10-20 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Multi-connected air conditioning system high pressure calculation method and multi-connected air conditioning system |
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| CN1139750A (en) * | 1995-03-15 | 1997-01-08 | 株式会社东芝 | Controller for air conditioner |
| CN1738995A (en) * | 2003-08-25 | 2006-02-22 | 大金工业株式会社 | Freezer apparatus |
| CN101276226A (en) * | 2007-03-26 | 2008-10-01 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve |
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2010
- 2010-01-05 CN CN201010001801.1A patent/CN101995125B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139750A (en) * | 1995-03-15 | 1997-01-08 | 株式会社东芝 | Controller for air conditioner |
| CN1738995A (en) * | 2003-08-25 | 2006-02-22 | 大金工业株式会社 | Freezer apparatus |
| CN101276226A (en) * | 2007-03-26 | 2008-10-01 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve |
Non-Patent Citations (1)
| Title |
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| JP特开2001-194029A 2001.07.17 |
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