CN106895557A - Air-conditioning system and its expansion valve control method and control device - Google Patents
Air-conditioning system and its expansion valve control method and control device Download PDFInfo
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- CN106895557A CN106895557A CN201710092578.8A CN201710092578A CN106895557A CN 106895557 A CN106895557 A CN 106895557A CN 201710092578 A CN201710092578 A CN 201710092578A CN 106895557 A CN106895557 A CN 106895557A
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- adjustment factor
- pressure
- aperture
- expulsion
- expansion valve
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention discloses a kind of air-conditioning system and its expansion valve control method and control device, the method includes：Obtain the delivery temperature and pressure at expulsion of air-conditioning system；Discharge superheat is obtained according to delivery temperature and the corresponding saturation temperature of pressure at expulsion；Judge discharge superheat whether less than default degree of superheat threshold value；If discharge superheat is less than default degree of superheat threshold value, determine whether pressure at expulsion whether more than preset pressure threshold value；If pressure at expulsion is more than preset pressure threshold value, the first adjustment factor is then obtained according to discharge superheat, and the second adjustment factor is obtained according to pressure at expulsion, and according to the first adjustment factor and the aperture of the second adjustment factor variable expansion valve, so as to, according to discharge superheat and the aperture of the common variable expansion valve of pressure at expulsion, discharge superheat stabilization can be made in normal range (NR), ensure the compressor reliability service of air-conditioning system, expansion valve excessively regulation can be avoided simultaneously causes pressure at expulsion too high, improves the reliability of air-conditioning system.
Description
Technical field
The present invention relates to air-conditioner technical field, more particularly to a kind of expansion valve control method of air-conditioning system, Yi Zhongkong
The expansion control valve device and a kind of air-conditioning system of adjusting system.
Background technology
In the related art, air-conditioning system generally controls discharge superheat by controlling the aperture of outer machine expansion valve, for example,
When discharge superheat is relatively low, reduce the aperture of expansion valve to improve discharge superheat.But, the shortcoming that correlation technique is present
It is, when delivery temperature is high and during pressure at expulsion high, because the corresponding saturation temperature of pressure at expulsion is raised, may cause to be vented
Temperature is relatively low, now, if reducing the aperture of expansion valve according to discharge superheat, delivery temperature and pressure at expulsion can be caused to enter
One step is raised, and deteriorates the operating condition of air-conditioning system, influences the reliability of air-conditioning system.
Therefore, correlation technique needs to be improved.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, of the invention
One purpose is to propose a kind of expansion valve control method of adjusting system, and the method can avoid expansion valve from excessively adjusting causes row
Atmospheric pressure is too high, improves the reliability of air-conditioning system.
It is another object of the present invention to the expansion control valve device for proposing a kind of air-conditioning system.It is of the invention another
Purpose is to propose a kind of air-conditioning system.
To reach above-mentioned purpose, a kind of expansion valve control method of air-conditioning system that one aspect of the present invention embodiment is proposed,
Comprise the following steps：Obtain the delivery temperature and pressure at expulsion of the air-conditioning system；According to the delivery temperature and the exhaust
The corresponding saturation temperature of pressure obtains discharge superheat；Judge the discharge superheat whether less than default degree of superheat threshold value；Such as
Whether really described discharge superheat is less than the default degree of superheat threshold value, then determine whether the pressure at expulsion more than default pressure
Force threshold；If the pressure at expulsion is more than the preset pressure threshold value, obtains first according to the discharge superheat and adjust
Coefficient, and the second adjustment factor is obtained according to the pressure at expulsion, and according to first adjustment factor and the second regulation system
The aperture of the number regulation expansion valve.
The expansion valve control method of the air-conditioning system for proposing according to embodiments of the present invention, obtains the delivery temperature of air-conditioning system
And pressure at expulsion, and discharge superheat is obtained according to delivery temperature and the corresponding saturation temperature of pressure at expulsion, judge discharge superheat
Whether degree if discharge superheat be less than default degree of superheat threshold value, determines whether exhaust pressure less than default degree of superheat threshold value
Whether power is more than preset pressure threshold value, if pressure at expulsion is more than preset pressure threshold value, first is obtained according to discharge superheat
Adjustment factor, and the second adjustment factor is obtained according to pressure at expulsion, and adjusted according to the first adjustment factor and the second adjustment factor
The aperture of expansion valve being saved, so that, according to discharge superheat and the aperture of the common variable expansion valve of pressure at expulsion, can make to be vented
Temperature stabilization is in normal range (NR), it is ensured that the compressor reliability service of air-conditioning system, while expansion valve excessively regulation can be avoided to lead
Cause pressure at expulsion too high, improve the reliability of air-conditioning system.
According to one embodiment of present invention, if the discharge superheat is less than the default degree of superheat threshold value and described
Pressure at expulsion is less than or equal to the preset pressure threshold value, then according to the discharge superheat the first adjustment factor of acquisition, and according to
First adjustment factor adjusts the aperture of the expansion valve.
According to one embodiment of present invention, if the discharge superheat is more than or equal to the default degree of superheat threshold
Value, then obtain the 3rd adjustment factor, and adjust the expansion valve according to the 3rd adjustment factor according to the delivery temperature
Aperture.
According to one embodiment of present invention, the expansion is adjusted according to first adjustment factor and the second adjustment factor
The aperture of valve, including：The previous aperture of expansion valve, first adjustment factor are multiplied and rounded with second adjustment factor
Afterwards as the aperture after adjustment；The aperture of the expansion valve is adjusted according to first adjustment factor, including：Before expansion valve
One aperture is multiplied with first adjustment factor and rounds afterwards as the aperture after adjustment；Adjusted according to the 3rd adjustment factor
The aperture of the expansion valve, including：As tune after the previous aperture of expansion valve is multiplied and is rounded with the 3rd adjustment factor
Aperture after whole.
To reach above-mentioned purpose, a kind of expansion valve control dress of air-conditioning system that another aspect of the present invention embodiment is proposed
Put, including：Temperature detecting unit, the temperature detecting unit is used to detect the delivery temperature of the air-conditioning system；Pressure detecting
Unit, the pressure sensing cell is used to detect the pressure at expulsion of the air-conditioning system；Control unit, described control unit difference
It is connected with the temperature detecting unit and the pressure sensing cell, described control unit is used for according to the delivery temperature and institute
State the corresponding saturation temperature of pressure at expulsion and obtain discharge superheat, and judge the discharge superheat whether less than the default degree of superheat
Threshold value, if the discharge superheat is less than the default degree of superheat threshold value, determines whether whether the pressure at expulsion is big
In preset pressure threshold value, if the pressure at expulsion is more than the preset pressure threshold value, obtained according to the discharge superheat
First adjustment factor, and the second adjustment factor is obtained according to the pressure at expulsion, and according to first adjustment factor and the
Two adjustment factors adjust the aperture of the expansion valve.
The expansion control valve device of the air-conditioning system for proposing according to embodiments of the present invention, detects empty by temperature detecting unit
The delivery temperature of adjusting system, and the pressure at expulsion of air-conditioning system is detected by pressure sensing cell, control unit is according to exhaust temperature
Whether degree saturation temperature corresponding with pressure at expulsion obtains discharge superheat, and judge discharge superheat less than default degree of superheat threshold
Whether value, if discharge superheat is less than default degree of superheat threshold value, determine whether pressure at expulsion more than preset pressure threshold value,
If pressure at expulsion is more than preset pressure threshold value, the first adjustment factor is obtained according to discharge superheat, and according to pressure at expulsion
The second adjustment factor is obtained, and according to the first adjustment factor and the aperture of the second adjustment factor variable expansion valve, so that, according to
The aperture of discharge superheat and the common variable expansion valve of pressure at expulsion, can make discharge superheat stabilization in normal range (NR), it is ensured that
The compressor reliability service of air-conditioning system, causes pressure at expulsion too high while expansion valve can be avoided excessively to adjust, and improves sky
The reliability of adjusting system.
According to one embodiment of present invention, if the discharge superheat is less than the default degree of superheat threshold value and described
Pressure at expulsion is less than or equal to the preset pressure threshold value, and described control unit then obtains first and adjusts according to the discharge superheat
Coefficient, and the aperture of the expansion valve is adjusted according to first adjustment factor.
According to one embodiment of present invention, if the discharge superheat is more than or equal to the default degree of superheat threshold
Value, described control unit then obtains the 3rd adjustment factor according to the delivery temperature, and is adjusted according to the 3rd adjustment factor
The aperture of the expansion valve.
According to one embodiment of present invention, described swollen according to first adjustment factor and the regulation of the second adjustment factor
During the aperture of swollen valve, the previous aperture of expansion valve, first adjustment factor and second regulation are by described control unit
Number multiplication simultaneously rounds the rear aperture as after adjustment；When the aperture of the expansion valve is adjusted according to first adjustment factor,
With first adjustment factor be multiplied the previous aperture of expansion valve and round afterwards as the aperture after adjustment by described control unit；
When the aperture of the expansion valve is adjusted according to the 3rd adjustment factor, described control unit by the previous aperture of expansion valve and
3rd adjustment factor is multiplied and rounds afterwards as the aperture after adjustment.
To reach above-mentioned purpose, a kind of air-conditioning system that another aspect of the invention embodiment is proposed, including described air-conditioning
The expansion control valve device of system.
The air-conditioning system for proposing according to embodiments of the present invention, by the expansion control valve device of above-mentioned air-conditioning system, according to
The aperture of discharge superheat and the common variable expansion valve of pressure at expulsion, can make discharge superheat stabilization in normal range (NR), it is ensured that
The compressor reliability service of air-conditioning system, causes pressure at expulsion too high while expansion valve can be avoided excessively to adjust, and improves sky
The reliability of adjusting system.
Brief description of the drawings
Fig. 1 is the flow chart of the expansion valve control method of air-conditioning system according to embodiments of the present invention；
Fig. 2 is the flow chart of the expansion valve control method of air-conditioning system according to an embodiment of the invention；
Fig. 3 is the block diagram of the expansion control valve device of air-conditioning system according to embodiments of the present invention；And
Fig. 4 is the block diagram of air-conditioning system according to embodiments of the present invention.
Reference：
Temperature detecting unit 10, pressure sensing cell 20 and control unit 30；
The expansion control valve device 100 of air-conditioning system 200 and air-conditioning system.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
It is exemplary to scheme the embodiment of description, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings the air-conditioning system and its expansion valve control method and control device of the embodiment of the present invention described.
Fig. 1 is the flow chart of the expansion valve control method of air-conditioning system according to embodiments of the present invention.As shown in figure 1, empty
The expansion valve control method of adjusting system is comprised the following steps：
S10：Obtain the delivery temperature T and pressure at expulsion P of air-conditioning system.
Specifically, temperature detecting unit and pressure sensing cell can be arranged on the exhaust outlet of compressor of air-conditioning system,
To obtain the delivery temperature T and pressure at expulsion P of air-conditioning system in real time.
S20：According to the delivery temperature T and corresponding saturation temperature T of pressure at expulsionμObtain discharge superheat σ.
Wherein, discharge superheat σ is equal to delivery temperature T saturation temperature Ts corresponding with pressure at expulsion PμBetween difference, i.e.,
σ=T-Tμ.So, in the running of air-conditioning system, the delivery temperature T and pressure at expulsion P of air-conditioning system are obtained in real time, with
Calculate corresponding discharge superheat σ.
S30：Judge discharge superheat σ whether less than default degree of superheat threshold value σ0。
S40：If discharge superheat σ is less than default degree of superheat threshold value σ0, then determine whether whether pressure at expulsion P is more than
Preset pressure threshold value P0。
S50：If pressure at expulsion P is more than preset pressure threshold value P0, then the first adjustment factor is obtained according to discharge superheat σ
K1 (i.e. discharge superheat correction factor), and the second adjustment factor K2 (i.e. pressure correcting coefficient) is obtained according to pressure at expulsion P, with
And according to the first adjustment factor K1 and aperture A of the second adjustment factor K2 variable expansion valves.
Further, according to one embodiment of present invention, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is less than or equal to preset pressure threshold value P0, then the first adjustment factor K1 is obtained according to discharge superheat σ, and according to the
The aperture A of one adjustment factor K1 variable expansion valves.
According to one embodiment of present invention, if discharge superheat σ is more than or equal to default degree of superheat threshold value σ0, then root
The 3rd adjustment factor K3 is obtained according to delivery temperature T, and according to the aperture of the 3rd adjustment factor K3 variable expansion valves.
Specifically, in the course of work of air-conditioning system, delivery temperature T and pressure at expulsion P is obtained in real time, and then obtain
Whether discharge superheat σ, then first judge whether discharge superheat σ is not enough and judge discharge superheat σ less than the default degree of superheat
Threshold value σ0If discharge superheat σ meets requirement, i.e. discharge superheat σ is more than or equal to default degree of superheat threshold value σ0, then basis
Delivery temperature T is adjusted to the aperture A of expansion valve, so that discharge superheat σ is maintained at rational scope and for example makes to be vented
Temperature σ is maintained at default degree of superheat threshold value σ0Near.
If discharge superheat σ is not enough, i.e. discharge superheat σ is less than default degree of superheat threshold value σ0, then prejudge whether
Whether it is that the degree of superheat that exhaust high temperature high pressure causes is not enough, that is, determines whether pressure at expulsion P more than preset pressure threshold value P0.Such as
Fruit pressure at expulsion P is more than preset pressure threshold value P0, then explanation is by delivery temperature T is too high, the excessive exhausts for causing of pressure at expulsion P
The degree of superheat is not enough, can be according to the discharge superheat σ and aperture A of pressure at expulsion P variable expansion valves；If pressure at expulsion P less than etc.
In preset pressure threshold value P0, then illustrate be not by delivery temperature T is too high, the excessive discharge superheats for causing of pressure at expulsion P are not enough,
Can be according to the aperture A of discharge superheat σ variable expansion valves.
As described above, in one embodiment of the invention, can be according to the delivery temperature T of air-conditioning system, discharge superheat σ
Parameter size with pressure at expulsion P is adjusted to the aperture A of expansion valve, and concrete operating principle is as follows.
One)
According to one embodiment of present invention, when discharge superheat σ is less than default degree of superheat threshold value σ0And pressure at expulsion P is big
In preset pressure threshold value P0When, the first adjustment factor K1 is obtained according to discharge superheat σ, and second is obtained according to pressure at expulsion P
Adjustment factor K2, and according to the first adjustment factor K1 and aperture A of the second adjustment factor K2 variable expansion valves.
According to one embodiment of present invention, according to the first adjustment factor K1 and the second adjustment factor K2 variable expansion valves
Aperture A, including：The previous aperture A0 of expansion valve, the first adjustment factor K1 and the second adjustment factor K2 are multiplied and are made after rounding
It is aperture A ＇, such as the A ＇=ceil (A0*K1*K2) after adjustment.Wherein, function F (x)=ceil (x) is represented more than or equal to x
Smallest positive integral value.
It should be noted that the previous aperture A0 of expansion valve can refer to the aperture of expansion valve previous moment.
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is more than preset pressure threshold value P0, then explanation is by delivery temperature T is too high, the excessive degrees of superheat for causing of pressure at expulsion P
Deficiency, now, obtains the delivery temperature T and pressure at expulsion P of air-conditioning system, to calculate corresponding discharge superheat σ, and root in real time
The first adjustment factor K1 is obtained according to discharge superheat σ, and the second adjustment factor K2 is obtained according to pressure at expulsion P, and will expansion
Previous aperture A0, the first adjustment factor K1 of valve and the second adjustment factor K2 are multiplied and round afterwards as the aperture A ＇ after adjustment,
Such as aperture A ＇=ceil (A0*K1*K2) after adjusting.
A specific embodiment of the invention, as shown in table 1, can be divided into 5 intervals by discharge superheat σ, and
The interval where discharge superheat σ is judged to obtain corresponding first adjustment factor K1, wherein, σ1＞ σ2＞ σ3＞ σ4＞ σ5＞
σ6, K11 ＞ K12 ＞ K13 ＞ K14 ＞ K15.
Table 1
As shown in Table 1, if discharge superheat σ is more than or equal to σ2And less than σ1, then the first adjustment factor K1=K11；If
Discharge superheat σ is more than or equal to σ3And less than σ2, then the first adjustment factor K1=K12；If discharge superheat σ is more than or equal to σ4
And less than σ3, then the first adjustment factor K1=K13；If discharge superheat σ is more than or equal to σ5And less than σ4, then first system is adjusted
Number K1=K14；If discharge superheat σ is more than or equal to σ6And less than σ5, then the first adjustment factor K1=K15.Wherein, first adjust
Section COEFFICIENT K 1 and discharge superheat σ positive correlations, that is, say, discharge superheat σ is smaller, and the first adjustment factor K1 is smaller,
So, corresponding first adjustment factor K1 can be obtained according to the scope residing for discharge superheat σ, for example, when exhaust
Degree of superheat σ is in and is more than or equal to σ3And less than σ2Scope when, the first adjustment factor K1 can be chosen for K12, to improve air-conditioning system
Delivery temperature T, and then improve discharge superheat σ.
Another specific embodiment of the invention, as shown in table 2, can be divided into 5 intervals by pressure at expulsion P, and
The interval where pressure at expulsion P is judged to obtain corresponding second adjustment factor K2, wherein, P1＞ P2＞ P3＞ P4＞ P5＞ P6,
K21 ＞ K22 ＞ K23 ＞ K24 ＞ K25.
Table 2
| The scope of pressure at expulsion P | |||||
| Second adjustment factor K2 | K21 | K22 | K23 | K24 | K25 |
As shown in Table 2, if pressure at expulsion P is more than or equal to P2And less than P1, then the second adjustment factor K2=K21；If row
Atmospheric pressure P is more than or equal to P3And less than P2, then the second adjustment factor K2=K22；If pressure at expulsion P is more than or equal to P4And be less than
P3, then the second adjustment factor K2=K23；If pressure at expulsion P is more than or equal to P5And less than P4, then the second adjustment factor K2=
K24；If pressure at expulsion P is more than or equal to P6And less than P5, then the second adjustment factor K2=K25.Wherein, the second adjustment factor K2
With pressure at expulsion P positive correlations, that is, say, pressure at expulsion P is bigger, the second adjustment factor K2 is bigger.
So, corresponding second adjustment factor K2 can be obtained according to the scope residing for pressure at expulsion P, for example, working as exhaust pressure
Power P is in and is more than or equal to P3And less than P2Scope when, the second adjustment factor K2 can be chosen for K22, to avoid the excessive of expansion valve
Regulation causes pressure at expulsion P too high.
As described above, when discharge superheat σ is less than default degree of superheat threshold value σ0And pressure at expulsion P is more than preset pressure threshold value
P0When, explanation be by delivery temperature T is too high, the excessive discharge superheats for causing of pressure at expulsion P are not enough, can be according to discharge superheat
σ and pressure at expulsion P, and corresponding first adjustment factor K1 and the second adjustment factor are obtained respectively with reference to the data in Tables 1 and 2
K2, is adjusted with the aperture A to expansion valve, it is assumed that the first adjustment factor K1=K11 for getting, and the second adjustment factor K2
=K21, then the aperture A ＇=ceil (A0*K11*K21) after adjusting.
Thus, the expansion valve control method of the air-conditioning system of the embodiment of the present invention is common according to discharge superheat and pressure at expulsion
With the aperture of variable expansion valve, discharge superheat stabilization can be made in normal range (NR), it is ensured that the compressor of air-conditioning system is reliably transported
OK, cause pressure at expulsion too high meanwhile, it is capable to avoid expansion valve from excessively adjusting, improve the reliability of air-conditioning system.
Two)
According to one embodiment of present invention, if discharge superheat σ is less than default degree of superheat threshold value σ0And pressure at expulsion P
Less than or equal to preset pressure threshold value P0, then the first adjustment factor K1 is obtained according to discharge superheat σ, and according to the first adjustment factor
The aperture A of K1 variable expansion valves.
According to one embodiment of present invention, according to the aperture A of the first adjustment factor K1 variable expansion valves, including：Will be swollen
The previous aperture A0 and the first adjustment factor K1 of swollen valve are multiplied and round afterwards as aperture A ＇, such as the A ＇=ceil after adjustment
(A0*K1)。
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is less than or equal to preset pressure threshold value P0, then illustrate not by delivery temperature T it is too high, pressure at expulsion P is excessive causes
Discharge superheat is not enough, now, with reference to the data in table 1, can obtain the first adjustment factor K1, and root according to discharge superheat σ
According to the aperture A of the first adjustment factor K1 variable expansion valves, it is assumed that the first adjustment factor K1=K11 for getting, then after adjusting
The aperture A ＇ of expansion valve=ceil (A0*K11).
Three)
According to one embodiment of present invention, if discharge superheat σ is more than or equal to default degree of superheat threshold value σ0, then root
The 3rd adjustment factor K3 is obtained according to delivery temperature T, and according to the aperture A of the 3rd adjustment factor K3 variable expansion valves.
According to one embodiment of present invention, according to the aperture A of the 3rd adjustment factor K3 variable expansion valves, including：Will be swollen
The previous aperture A0 of swollen valve and the 3rd adjustment factor K3 are multiplied and round afterwards as the aperture A ＇, such as A ＇=ceil after adjustment
(A0*K3)。
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is more than or equal to default degree of superheat threshold
Value σ0, then illustrate that discharge superheat σ is normal, now, the 3rd adjustment factor K3 can be obtained according to delivery temperature T, and expansion valve
Previous aperture A0 and the 3rd adjustment factor K3 are multiplied and round afterwards as the aperture A ＇ after adjustment, the aperture of the expansion valve after adjustment
A ＇=ceil (A0*K3).
A specific embodiment of the invention, as shown in table 3, can be divided into 5 intervals, and sentence by delivery temperature T
It is interval to obtain corresponding 3rd adjustment factor K3 where disconnected delivery temperature T, wherein, T1＞ T2＞ T3＞ T4＞ T5＞ T6, K31
＞ K32 ＞ K33 ＞ K34 ＞ K35.
Table 3
| The scope of delivery temperature T | |||||
| 3rd adjustment factor K3 | K31 | K32 | K33 | K34 | K35 |
As shown in Table 3, if delivery temperature T is more than or equal to T2And less than T1, then the 3rd adjustment factor K3=K31；If row
Temperature degree T is more than or equal to T3And less than T2, then the 3rd adjustment factor K3=K32；If delivery temperature T is more than or equal to T4And be less than
T3, then the 3rd adjustment factor K3=K33；If delivery temperature T is more than or equal to T5And less than T4, then the 3rd adjustment factor K3=
K34；If delivery temperature T is more than or equal to T6And less than T5, then the 3rd adjustment factor K3=K35.Wherein, the 3rd adjustment factor K3
With delivery temperature T positive correlations, that is, say, delivery temperature T is bigger, and the 3rd adjustment factor K3 is bigger.
So, it is more than or equal to default degree of superheat threshold value σ in discharge superheat σ0When i.e. discharge superheat is normal, can basis
Scope residing for delivery temperature T obtains corresponding 3rd adjustment factor K3, for example, when delivery temperature T is more than or equal to T3And less than T2
When, the 3rd adjustment factor K3 can be chosen for K32, and according to the aperture A of the 3rd adjustment factor K3 variable expansion valves, so as to be vented
Temperature σ is maintained at default degree of superheat threshold value σ0Near, and then ensure the stable operation of the compressor of air-conditioning system.
As described above, as shown in Fig. 2 the air-conditioning system expansion valve control method of the embodiment of the present invention specifically includes following step
Suddenly：
S101：The delivery temperature T and pressure at expulsion P of air-conditioning system are obtained in real time.
S102：According to the delivery temperature T and corresponding saturation temperature T of pressure at expulsionμObtain discharge superheat σ.
S103：Judge discharge superheat σ whether less than default degree of superheat threshold value σ0。
If it is, performing step S105；If it is not, then performing step S104.
S104：3rd adjustment factor K3 is obtained according to delivery temperature T, and the previous aperture A0 of expansion valve and the 3rd is adjusted
COEFFICIENT K 3 is multiplied and rounds afterwards as aperture A ＇, such as the A ＇=ceil (A0*K3) after adjustment.
S105：Judge pressure at expulsion P whether more than preset pressure threshold value P0。
If it is, performing step S106；If it is not, then performing step S107.
S106：First adjustment factor K1 is obtained according to discharge superheat σ, and the second regulation system is obtained according to pressure at expulsion P
Number K2, and the previous aperture A0 of expansion valve, the first adjustment factor K1 and the second adjustment factor K2 are multiplied and round it is rear as
Aperture A ＇, such as A ＇=ceil (A0*K1*K2) after adjustment.
S107：First adjustment factor K1 is obtained according to discharge superheat σ, and the previous aperture A0 of expansion valve and first is adjusted
Section COEFFICIENT K 1 is multiplied and rounds afterwards as aperture A ＇, such as the A ＇=ceil (A0*K1) after adjustment.
To sum up, the expansion valve control method of the air-conditioning system for proposing according to embodiments of the present invention, obtains the row of air-conditioning system
Temperature degree and pressure at expulsion, and discharge superheat is obtained according to delivery temperature and the corresponding saturation temperature of pressure at expulsion, judge row
Whether the gas degree of superheat, if discharge superheat is less than default degree of superheat threshold value, determines whether less than default degree of superheat threshold value
Whether pressure at expulsion is more than preset pressure threshold value, if pressure at expulsion is more than preset pressure threshold value, is obtained according to discharge superheat
The first adjustment factor is taken, and the second adjustment factor is obtained according to pressure at expulsion, and adjusted according to the first adjustment factor and second
The aperture of coefficient adjustment expansion valve, so that, according to discharge superheat and the aperture of the common variable expansion valve of pressure at expulsion, can make
Discharge superheat stabilization is in normal range (NR), it is ensured that the compressor reliability service of air-conditioning system, while expansion valve can be avoided excessive
Regulation causes pressure at expulsion too high, improves the reliability of air-conditioning system.
Fig. 3 is the block diagram of the expansion control valve device of air-conditioning system according to embodiments of the present invention.Such as Fig. 3 institutes
Show, the expansion control valve device of air-conditioning system includes：Temperature detecting unit 10, pressure sensing cell 20 and control unit 30.
Wherein, temperature detecting unit 10 is used to detect the delivery temperature T of air-conditioning system；Pressure sensing cell 20 is used to detect
The pressure at expulsion P of air-conditioning system；Control unit 30 is connected with temperature detecting unit 10 and pressure sensing cell 20 respectively, and control is single
Unit 30 is used to obtain discharge superheat σ according to the corresponding saturation temperatures of delivery temperature T and pressure at expulsion P, and judges discharge superheat
Whether degree σ is less than default degree of superheat threshold value σ0If discharge superheat σ is less than default degree of superheat threshold value σ0, then the row of determining whether
Whether atmospheric pressure P is more than preset pressure threshold value P0If pressure at expulsion P is more than preset pressure threshold value P0, then according to discharge superheat
σ obtains the first adjustment factor K1, and obtains the second adjustment factor K2 according to pressure at expulsion P, and according to the first adjustment factor K1
With the aperture A of the second adjustment factor K2 variable expansion valves.
Further, according to one embodiment of present invention, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is less than or equal to preset pressure threshold value P0, control unit 30 is then according to discharge superheat σ the first adjustment factors of acquisition
K1, and according to the aperture A of the first adjustment factor K1 variable expansion valves.
According to one embodiment of present invention, if discharge superheat σ is more than or equal to default degree of superheat threshold value σ0, control
Unit 30 then obtains the 3rd adjustment factor K3 according to delivery temperature T, and according to the aperture of the 3rd adjustment factor K3 variable expansion valves.
Specifically, temperature detecting unit 10 and pressure sensing cell 20 can be arranged on the compressor air-discharging of air-conditioning system
Mouthful, to obtain the delivery temperature T and pressure at expulsion P of air-conditioning system in real time, control unit 30 is according to delivery temperature T and pressure at expulsion
The corresponding saturation temperature T of PμDischarge superheat σ is obtained, wherein, it is corresponding with pressure at expulsion P that discharge superheat σ is equal to delivery temperature T
Saturation temperature TμBetween difference, i.e. σ=T-Tμ。
In the course of work of air-conditioning system, control unit 30 obtains delivery temperature T and pressure at expulsion P in real time, and then obtains
Discharge superheat σ is taken, is then first judged whether discharge superheat σ is not enough and is judged discharge superheat σ whether less than default overheat
Degree threshold value σ0If discharge superheat σ meets requirement, i.e. discharge superheat σ is more than or equal to default degree of superheat threshold value σ0, control
Unit 30 is then adjusted according to delivery temperature T to the aperture A of expansion valve, so that discharge superheat σ is maintained at rational scope
Discharge superheat σ is for example set to be maintained at default degree of superheat threshold value σ0Near.
If discharge superheat σ is not enough, i.e. discharge superheat σ is less than default degree of superheat threshold value σ0, control unit 30 is then pre-
First judge whether it is that the degree of superheat that exhaust high temperature high pressure causes is not enough, that is, determine whether pressure at expulsion P whether more than default pressure
Force threshold P0.If pressure at expulsion P is more than preset pressure threshold value P0, then explanation is by delivery temperature T is too high, pressure at expulsion P is excessive
The discharge superheat for causing is not enough, and control unit 30 can be according to the discharge superheat σ and aperture A of pressure at expulsion P variable expansion valves；
If pressure at expulsion P is less than or equal to preset pressure threshold value P0, then illustrate be not by delivery temperature T it is too high, pressure at expulsion P is excessive draws
The discharge superheat for rising is not enough, and control unit 30 can be according to the aperture A of discharge superheat σ variable expansion valves.
As described above, in one embodiment of the invention, control unit 30 can according to the delivery temperature T of air-conditioning system,
The parameter size of discharge superheat σ and pressure at expulsion P is adjusted to the aperture A of expansion valve, and concrete operating principle is as follows.
One)
According to one embodiment of present invention, when discharge superheat σ is less than default degree of superheat threshold value σ0And pressure at expulsion P is big
In preset pressure threshold value P0When, control unit 30 obtains the first adjustment factor K1 according to discharge superheat σ, and according to pressure at expulsion
P obtains the second adjustment factor K2, and according to the first adjustment factor K1 and aperture A of the second adjustment factor K2 variable expansion valves.
According to one embodiment of present invention, according to the first adjustment factor K1 and the second adjustment factor K2 variable expansion valves
Aperture when, control unit 30 by the previous aperture A0 of expansion valve, the first adjustment factor K1 and the second adjustment factor K2 be multiplied simultaneously
As the aperture A ＇ after adjustment after rounding.
It should be noted that the previous aperture A0 of expansion valve can refer to the aperture of expansion valve previous moment.
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is more than preset pressure threshold value P0, then explanation is by delivery temperature T is too high, the excessive degrees of superheat for causing of pressure at expulsion P
Deficiency, now, temperature detecting unit 10 obtains the delivery temperature T of air-conditioning system in real time, and pressure sensing cell 20 obtains empty in real time
The pressure at expulsion P of adjusting system, control unit 30 calculates corresponding discharge superheat σ according to delivery temperature T and pressure at expulsion P, and
First adjustment factor K1 is obtained according to discharge superheat σ, and the second adjustment factor K2 is obtained according to pressure at expulsion P, and will be swollen
Previous aperture A0, the first adjustment factor K1 of swollen valve and the second adjustment factor K2 are multiplied and round afterwards as the aperture after adjustment
A ＇, such as the aperture A ＇=ceil (A0*K1*K2) after adjusting.
A specific embodiment of the invention, as shown in table 1, can be divided into 5 intervals by discharge superheat σ, and
The interval where discharge superheat σ is judged to obtain corresponding first adjustment factor K1, wherein, σ1＞ σ2＞ σ3＞ σ4＞ σ5＞
σ6, K11 ＞ K12 ＞ K13 ＞ K14 ＞ K15.
Table 1
As shown in Table 1, if discharge superheat σ is more than or equal to σ2And less than σ1, then the first adjustment factor K1=K11；If
Discharge superheat σ is more than or equal to σ3And less than σ2, then the first adjustment factor K1=K12；If discharge superheat σ is more than or equal to σ4
And less than σ3, then the first adjustment factor K1=K13；If discharge superheat σ is more than or equal to σ5And less than σ4, then first system is adjusted
Number K1=K14；If discharge superheat σ is more than or equal to σ6And less than σ5, then the first adjustment factor K1=K15.Wherein, first adjust
Section COEFFICIENT K 1 and discharge superheat σ positive correlations, that is, say, discharge superheat σ is smaller, and the first adjustment factor K1 is smaller.
So, control unit 30 can obtain corresponding first adjustment factor K1, example according to the scope residing for discharge superheat σ
Such as, it is more than or equal to σ when discharge superheat σ is in3And less than σ2Scope when, the first adjustment factor K1 can be chosen for K12, to carry
The delivery temperature T of air-conditioning system high, and then improve discharge superheat σ.
Another specific embodiment of the invention, as shown in table 2, can be divided into 5 intervals by pressure at expulsion P, and
The interval where pressure at expulsion P is judged to obtain corresponding second adjustment factor K2, wherein, P1＞ P2＞ P3＞ P4＞ P5＞ P6,
K21 ＞ K22 ＞ K23 ＞ K24 ＞ K25.
Table 2
| The scope of pressure at expulsion P | |||||
| Second adjustment factor K2 | K21 | K22 | K23 | K24 | K25 |
As shown in Table 2, if pressure at expulsion P is more than or equal to P2And less than P1, then the second adjustment factor K2=K21；If row
Atmospheric pressure P is more than or equal to P3And less than P2, then the second adjustment factor K2=K22；If pressure at expulsion P is more than or equal to P4And be less than
P3, then the second adjustment factor K2=K23；If pressure at expulsion P is more than or equal to P5And less than P4, then the second adjustment factor K2=
K24；If pressure at expulsion P is more than or equal to P6And less than P5, then the second adjustment factor K2=K25.Wherein, the second adjustment factor K2
With pressure at expulsion P positive correlations, that is, say, pressure at expulsion P is bigger, the second adjustment factor K2 is bigger.
So, control unit 30 can obtain corresponding second adjustment factor K2, example according to the scope residing for pressure at expulsion P
Such as, it is more than or equal to P when pressure at expulsion P is in3And less than P2Scope when, the second adjustment factor K2 can be chosen for K22, to avoid
The excessive regulation of expansion valve causes pressure at expulsion P too high.
As described above, when discharge superheat σ is less than default degree of superheat threshold value σ0And pressure at expulsion P is more than preset pressure threshold value
P0When, explanation is that control unit 30 can be real-time by delivery temperature T is too high, the excessive discharge superheats for causing of pressure at expulsion P are not enough
Discharge superheat σ and pressure at expulsion P is obtained, and corresponding first adjustment factor K1 is obtained respectively with reference to the data in Tables 1 and 2
With the second adjustment factor K2, it is adjusted with the aperture A to expansion valve, it is assumed that the first adjustment factor K1=K11 for getting, and
Second adjustment factor K2=K21, then the aperture A ＇=ceil (A0*K11*K21) after adjusting.
Thus, the expansion valve control method of the air-conditioning system of the embodiment of the present invention is common according to discharge superheat and pressure at expulsion
With the aperture of variable expansion valve, discharge superheat stabilization can be made in normal range (NR), it is ensured that the compressor of air-conditioning system is reliably transported
OK, cause pressure at expulsion too high meanwhile, it is capable to avoid expansion valve from excessively adjusting, improve the reliability of air-conditioning system.
Two)
According to one embodiment of present invention, if discharge superheat σ is less than default degree of superheat threshold value and pressure at expulsion P is small
In equal to preset pressure threshold value, control unit 30 then obtains the first adjustment factor K1 according to discharge superheat σ, and is adjusted according to first
Save the aperture of the variable expansion valve of COEFFICIENT K 1.
According to one embodiment of present invention, in the aperture according to the first adjustment factor K1 variable expansion valves, control is single
With the first adjustment factor K1 be multiplied the previous aperture of expansion valve and round afterwards as the aperture after adjustment by unit 30.
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is less than default degree of superheat threshold value σ0And
Pressure at expulsion P is less than or equal to preset pressure threshold value P0, then illustrate not by delivery temperature T it is too high, pressure at expulsion P is excessive causes
Discharge superheat is not enough, and now, with reference to the data in table 1, control unit 30 can obtain the first regulation system according to discharge superheat σ
Number K1, and according to the aperture A of the first adjustment factor K1 variable expansion valves, it is assumed that the first adjustment factor K1=K11 for getting, then
The aperture A ＇ of the expansion valve after adjustment=ceil (A0*K11).
Three)
According to one embodiment of present invention, discharge superheat σ is more than or equal to default degree of superheat threshold value, control unit 30
The 3rd adjustment factor K3 is then obtained according to delivery temperature T, and according to the aperture of the 3rd adjustment factor K3 variable expansion valves.
According to one embodiment of present invention, in the aperture according to the 3rd adjustment factor K3 variable expansion valves, control is single
With the 3rd adjustment factor K3 be multiplied the previous aperture of expansion valve and round afterwards as the aperture after adjustment by unit 30.
Specifically, in the course of work of air-conditioning system, if discharge superheat σ is more than or equal to default degree of superheat threshold
Value σ0, then illustrate that discharge superheat σ is normal, now, control unit 30 can obtain the 3rd adjustment factor K3 according to delivery temperature T,
It is swollen after adjustment and the previous aperture A0 and the 3rd adjustment factor K3 of expansion valve are multiplied and round the rear aperture A ＇ as after adjustment
The aperture A ＇ of swollen valve=ceil (A0*K3).
A specific embodiment of the invention, as shown in table 3, can be divided into 5 intervals, and sentence by delivery temperature T
It is interval to obtain corresponding 3rd adjustment factor K3 where disconnected delivery temperature T, wherein, T1＞ T2＞ T3＞ T4＞ T5＞ T6, K31
＞ K32 ＞ K33 ＞ K34 ＞ K35.
Table 3
| The scope of delivery temperature T | |||||
| 3rd adjustment factor K3 | K31 | K32 | K33 | K34 | K35 |
As shown in Table 3, if delivery temperature T is more than or equal to T2And less than T1, then the 3rd adjustment factor K3=K31；If row
Temperature degree T is more than or equal to T3And less than T2, then the 3rd adjustment factor K3=K32；If delivery temperature T is more than or equal to T4And be less than
T3, then the 3rd adjustment factor K3=K33；If delivery temperature T is more than or equal to T5And less than T4, then the 3rd adjustment factor K3=
K34；If delivery temperature T is more than or equal to T6And less than T5, then the 3rd adjustment factor K3=K35.Wherein, the 3rd adjustment factor K3
With delivery temperature T positive correlations, that is, say, delivery temperature T is bigger, and the 3rd adjustment factor K3 is bigger.
So, it is more than or equal to default degree of superheat threshold value σ in discharge superheat σ0When i.e. discharge superheat is normal, control is single
Unit 30 can obtain corresponding 3rd adjustment factor K3 according to the scope residing for delivery temperature T, for example, when delivery temperature T more than etc.
In T3And less than T2When, the 3rd adjustment factor K3 can be chosen for K32, and according to the aperture of the 3rd adjustment factor K3 variable expansion valves
A, so that discharge superheat σ is maintained at default degree of superheat threshold value σ0Near, and then ensure the stabilization fortune of the compressor of air-conditioning system
OK.
As described above, the course of work of the expansion control valve device of air-conditioning system according to embodiments of the present invention is as follows：
When discharge superheat σ is more than or equal to default degree of superheat threshold value σ0When i.e. discharge superheat σ is normal, control unit 30
According to the aperture of delivery temperature T variable expansion valves.When discharge superheat σ is less than default degree of superheat threshold value σ0That is discharge superheat σ is not
When sufficient, whether control unit 30 first judges pressure at expulsion P more than preset pressure threshold value P0First judge whether it is by delivery temperature
The excessive discharge superheat σ for causing is not enough for too high, pressure at expulsion, if pressure at expulsion P is more than preset pressure threshold value P0Be by
The excessive discharge superheat σ for causing is not enough for excessive discharge temperature, pressure at expulsion, and control unit 30 is then obtained according to discharge superheat σ
The first adjustment factor K1 is taken, and the previous aperture A0 and the first adjustment factor K1 of expansion valve is multiplied and is rounded rear as after adjusting
Aperture A ＇, such as A ＇=ceil (A0*K1)；If pressure at expulsion P is less than or equal to preset pressure threshold value P0It is not by being vented
Temperature is too high, the excessive discharge superheat σ that causes of pressure at expulsion is not enough, and control unit 30 then obtains the according to discharge superheat σ
One adjustment factor K1, and the second adjustment factor K2 is obtained according to pressure at expulsion P, and by previous aperture A0, first of expansion valve
Adjustment factor K1 and the second adjustment factor K2 are multiplied and round afterwards as aperture A ＇, such as the A ＇=ceil (A0*K1* after adjustment
K2)。
To sum up, the expansion control valve device of the air-conditioning system for proposing according to embodiments of the present invention, by temperature detecting unit
Detect air-conditioning system delivery temperature, and by pressure sensing cell detect air-conditioning system pressure at expulsion, control unit according to
Whether delivery temperature and the corresponding saturation temperature of pressure at expulsion obtain discharge superheat, and judge discharge superheat less than presetting
Whether heat degree threshold, if discharge superheat is less than default degree of superheat threshold value, determine whether pressure at expulsion more than default pressure
Force threshold, if pressure at expulsion is more than preset pressure threshold value, the first adjustment factor is obtained according to discharge superheat, and according to row
Atmospheric pressure obtains the second adjustment factor, and according to the first adjustment factor and the aperture of the second adjustment factor variable expansion valve, from
And, according to discharge superheat and the aperture of the common variable expansion valve of pressure at expulsion, discharge superheat stabilization can be made in normal model
Enclose, it is ensured that the compressor reliability service of air-conditioning system, cause pressure at expulsion too high while expansion valve can be avoided excessively to adjust, carry
The reliability of air-conditioning system high.
Fig. 4 is the block diagram of air-conditioning system according to embodiments of the present invention.As shown in figure 4, air-conditioning system 200 includes
The expansion control valve device 100 of air-conditioning system.
To sum up, the air-conditioning system for proposing according to embodiments of the present invention, by the expansion control valve device of above-mentioned air-conditioning system,
According to discharge superheat and the aperture of the common variable expansion valve of pressure at expulsion, discharge superheat stabilization can be made in normal range (NR),
Ensure the compressor reliability service of air-conditioning system, cause pressure at expulsion too high while expansion valve can be avoided excessively to adjust, improve
The reliability of air-conditioning system.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, must rather than the device or element for indicating or imply meaning
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or two interaction relationships of element, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combined in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (9)
1. a kind of expansion valve control method of air-conditioning system, it is characterised in that comprise the following steps：
Obtain the delivery temperature and pressure at expulsion of the air-conditioning system；
Discharge superheat is obtained according to the delivery temperature and the corresponding saturation temperature of the pressure at expulsion；
Judge the discharge superheat whether less than default degree of superheat threshold value；
If the discharge superheat is less than the default degree of superheat threshold value, determine whether whether the pressure at expulsion is more than
Preset pressure threshold value；
If the pressure at expulsion is more than the preset pressure threshold value, the first regulation system is obtained according to the discharge superheat
Number, and the second adjustment factor is obtained according to the pressure at expulsion, and according to first adjustment factor and the second adjustment factor
Adjust the aperture of the expansion valve.
2. the expansion valve control method of air-conditioning system according to claim 1, it is characterised in that
If the discharge superheat is less than the default degree of superheat threshold value and the pressure at expulsion is less than or equal to the default pressure
Force threshold, then obtain the first adjustment factor, and adjust described swollen according to first adjustment factor according to the discharge superheat
The aperture of swollen valve.
3. the expansion valve control method of air-conditioning system according to claim 2, it is characterised in that
If the discharge superheat is more than or equal to the default degree of superheat threshold value, the 3rd is obtained according to the delivery temperature
Adjustment factor, and the aperture of the expansion valve is adjusted according to the 3rd adjustment factor.
4. the expansion valve control method of air-conditioning system according to claim 3, it is characterised in that wherein,
The aperture of the expansion valve is adjusted according to first adjustment factor and the second adjustment factor, including：Before expansion valve
One aperture, first adjustment factor are multiplied with second adjustment factor and round afterwards as the aperture after adjustment；
The aperture of the expansion valve is adjusted according to first adjustment factor, including：By the previous aperture of expansion valve and described
One adjustment factor is multiplied and rounds afterwards as the aperture after adjustment；
The aperture of the expansion valve is adjusted according to the 3rd adjustment factor, including：By the previous aperture of expansion valve and described
Three adjustment factors are multiplied and round afterwards as the aperture after adjustment.
5. the expansion control valve device of a kind of air-conditioning system, it is characterised in that including：
Temperature detecting unit, the temperature detecting unit is used to detect the delivery temperature of the air-conditioning system；
Pressure sensing cell, the pressure sensing cell is used to detect the pressure at expulsion of the air-conditioning system；
Control unit, described control unit is connected with the temperature detecting unit and the pressure sensing cell respectively, the control
Unit processed is used to obtain discharge superheat according to the delivery temperature and the corresponding saturation temperature of the pressure at expulsion, and judges institute
Whether discharge superheat is stated less than default degree of superheat threshold value, if the discharge superheat is less than the default degree of superheat threshold value,
Whether the pressure at expulsion is then determined whether more than preset pressure threshold value, if the pressure at expulsion is more than the preset pressure
Threshold value, then obtain the first adjustment factor according to the discharge superheat, and obtains the second adjustment factor according to the pressure at expulsion,
And the aperture of the expansion valve is adjusted according to first adjustment factor and the second adjustment factor.
6. the expansion control valve device of air-conditioning system according to claim 5, it is characterised in that
If the discharge superheat is less than the default degree of superheat threshold value and the pressure at expulsion is less than or equal to the default pressure
Force threshold, described control unit then obtains the first adjustment factor according to the discharge superheat, and according to the described first regulation system
The aperture of the number regulation expansion valve.
7. the expansion control valve device of air-conditioning system according to claim 6, it is characterised in that
If the discharge superheat is more than or equal to the default degree of superheat threshold value, described control unit is then according to the exhaust
Temperature obtains the 3rd adjustment factor, and the aperture of the expansion valve is adjusted according to the 3rd adjustment factor.
8. the expansion control valve device of air-conditioning system according to claim 7, it is characterised in that wherein,
When the aperture of the expansion valve is adjusted according to first adjustment factor and the second adjustment factor, described control unit will
The previous aperture of expansion valve, first adjustment factor be multiplied and round with second adjustment factor after as opening after adjustment
Degree；
When the aperture of the expansion valve is adjusted according to first adjustment factor, described control unit opens the previous of expansion valve
Spend after being multiplied and round with first adjustment factor as the aperture after adjustment；
When the aperture of the expansion valve is adjusted according to the 3rd adjustment factor, described control unit opens the previous of expansion valve
Spend after being multiplied and round with the 3rd adjustment factor as the aperture after adjustment.
9. a kind of air-conditioning system, it is characterised in that the expansion including the air-conditioning system according to any one of claim 5-8
Control valve device.
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