CN105371499B - A kind of control method of air-source water heater electric expansion valve - Google Patents
A kind of control method of air-source water heater electric expansion valve Download PDFInfo
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- CN105371499B CN105371499B CN201510728573.0A CN201510728573A CN105371499B CN 105371499 B CN105371499 B CN 105371499B CN 201510728573 A CN201510728573 A CN 201510728573A CN 105371499 B CN105371499 B CN 105371499B
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Abstract
The present invention provides a kind of control method of air-source water heater electric expansion valve, start operation electric expansion valve can be there are two intrinsic open range, to obtain first adjustable range；A current frequency of frequency-changeable compressor, and the adjustable range of the electric expansion valve according to corresponding to pre-set press running frequency are obtained in real time, obtain second adjustable range；According to the real-time degree of superheat T of acquisition frequency-changeable compressor and by accurately calculating, a final adjustable range as electric expansion valve；Gather a variation of delivery temperature, according to the variation tendency of outlet air temperature Td, it is adjusted accordingly in the adjustable range of final electric expansion valve, and the more efficient rational aperture for adjusting electric expansion valve of running frequency that press can be combined in final adjustable range, the flexibility ratio of air-source water heater work is substantially increased, effectively prevents systemic breakdown.
Description
Technical field
The present invention relates to a kind of control methods of air-source water heater electric expansion valve.
Background technology
Air-source water heater currently used in the market mainly by generating thermal energy with air heat-exchange, has solar water
Device energy-saving and environmental protection, it is safe the advantages of, and solve the problems, such as that solar water heater adopts heat by sunlight and installation is inconvenient.Due to
Air-source water heater is heated by medium and air exchange heat, and electrical heating elements is not required to be contacted with water, are not also just had
The danger of electric leakage also eliminates the hidden danger of gas heater poisoning and explosion, caused by more discharging exhaust gas without fuel-oil water heater
Air pollution, so air-source water heater is received by users.
The operation principle of air-source water heater approximately as：Electric expansion valve throttles by being collected to temperature sensor
Parameter calculated, to the driving plate of air-source water heater send regulating command from driving plate to electric expansion valve export believe
Number, drive electronic expansion valve events.Electric expansion valve needs several seconds from standard-sized sheet to fully closed, reacts quick action, will not
There are static degree of superheat phenomenon, therefore the advantages such as Applicable temperature is low are widely used.Can at present producer in electric expansion valve control
Aperture mode is corresponded to using degree of superheat automatic adjustment mode or frequency-changeable compressor Frequency point when processed.Former is to temperature sensor
Precision it is higher, and easily when error or failure occurs in some temperature sensor, entire heat pump or air-conditioning system will be in and lose
Control state, for latter control mode since the degree of superheat does not participate in adjusting, the ability that refrigeration system adapts to variation operating mode is not good enough, and
Research and development need to put into excessive experiment with the electronic expansion valve opening of each Frequency point of establishment early period, cause the big of manpower, material resources and financial resources
Big waste.
The content of the invention
It is an object of the invention to overcome the defect of the prior art, a kind of air-source water heater electric expansion valve is provided
Control method, the characteristic of automatic adjustment wide with scope.
What the present invention was realized in：A kind of control method of air-source water heater electric expansion valve, including following step
Suddenly：
(1) air-source water heater is provided, there is a control system, control system includes line control machine, indoor mainboard, room
Outer mainboard and driving plate, line control machine are communicated to connect with indoor mainboard, and indoor mainboard is communicated to connect with outdoor mainboard and driving plate, room
Interior mainboard is connected with indoor water pump, electrical heating, and outdoor mainboard and driving plate are connected with frequency-changeable compressor, wind turbine, four-way valve, electronics
Expansion valve, exhaust gas temperature sensor, suction temperature sensor, evaporating temperature sensor, outer shroud temperature sensor；
(2) air-source water heater is started shooting, electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax, then opens
To initial opening P0, the frequency of frequency-changeable compressor rises or falls, and electric expansion valve is followed out to corresponding reference opening amount；
(3) after running seven minutes, exhaust gas temperature sensor, suction temperature sensor, detect evaporating temperature sensor respectively
Outlet air temperature Td, suction temperature Ts, the evaporating temperature Top of frequency-changeable compressor；
(4) control system calculates the real-time degree of superheat T, T=Ts-Top according to suction temperature and evaporating temperature, and records, together
The actual aperture of Shi Dingyi electric expansion valves is P, and the reference opening amount of electric expansion valve is Pa, and the automatic adjustment of electric expansion valve is opened
It spends for Pb, P=Pa+Pb, and automatically adjusts the following relation that meets between aperture Pb and real-time degree of superheat T, during T≤- 5, Pb=-
18；During -5 ＜ T ＜ -2, Pb=-8；During -2≤T ＜ 0, Pb=0；During 0≤T ＜ 2, Pb=+5；During T >=2, Pb=+15；
(5) if the resistance value of suction temperature sensor or evaporating temperature sensor exceeds error range or failure, real-time mistake
Temperature T is not involved in automatically adjusting, and electric expansion valve is opened to corresponding reference opening amount；If during into defrosting mode, electric expansion valve is opened
To defrosting aperture, after exiting defrosting, recover to original aperture；Other patterns then enter step (6)；
(6) if during outlet air temperature Td >=98, the degree of superheat does not participate in automatic adjustment, does not allow to turn down opening for electric expansion valve
Degree, and the aperture of electric expansion valve opened big by 3 × (Td-97) step every 24 seconds；If during 98 DEG C of 95 DEG C of ＜ Td ＜, the degree of superheat
Automatic adjustment is not participated in, does not allow the aperture for turning down electric expansion valve, and the aperture of electric expansion valve will increase；If Td≤95 DEG C,
The aperture of electric expansion valve gradually recovers normal, participates in Pb verifications, performs P=Pa+Pb.
Further, each frequency of the frequency-changeable compressor corresponds to electronic expansion valve opening data deposit control system as change
The reference opening amount Pa of frequency compressor.
The present invention is according to outlet air temperature Td, to determine the actual aperture P=reference opening amounts Pa+ automatic adjustments of electric expansion valve
Aperture Pb according to the variation tendency of delivery temperature, is adjusted, effectively accordingly in the adjustable range of final electric expansion valve
It is rational to adjust the aperture of electric expansion valve, while the resistance value of suction temperature sensor or inlet temperature sensor can also be avoided
Cause the situation of system crash beyond error range or failure, substantially increase the security of product, enter defrosting mode
When, it can also freely adjust, substantially increase the flexibility ratio of air-source water heater work, effectively prevent systemic breakdown.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the structure diagram of air-source water heater provided in an embodiment of the present invention；
Fig. 2 is the work flow diagram of air-source water heater.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
Such as Fig. 1-2, inventive embodiments provide a kind of control method of air-source water heater electric expansion valve, specifically refer to
It is described further below.
The first step provides an air-source water heater, has a control system, and control system includes line control machine, indoor master
Plate, outdoor mainboard and driving plate, line control machine are communicated to connect with indoor mainboard, indoor mainboard and outdoor mainboard and driving plate communication link
It connects, indoor mainboard is connected with indoor water pump, electrical heating, and outdoor mainboard and driving plate are connected with frequency-changeable compressor, wind turbine, four-way
Valve, electric expansion valve, exhaust gas temperature sensor, suction temperature sensor, evaporating temperature sensor, outer shroud temperature sensor.
Second step starts shooting air-source water heater, and electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax,
It is opened again to initial opening P0, the frequency of frequency-changeable compressor rises or falls, and electric expansion valve is followed out to corresponding reference opening amount.
3rd step, after running seven minutes, exhaust gas temperature sensor, suction temperature sensor, evaporating temperature sensor, difference
Detect outlet air temperature Td, suction temperature Ts, the inlet temperature Top of frequency-changeable compressor.
4th step, control system calculates the real-time degree of superheat T, T=Ts-Top according to suction temperature and evaporating temperature, and remembers
Record, while the actual aperture of electric expansion valve is defined as P, the reference opening amount of electric expansion valve is Pa, and the frequency-changeable compressor is each
Frequency corresponds to reference opening amount Pa of the electronic expansion valve opening data deposit control system as frequency-changeable compressor, electric expansion valve
It is Pb, P=Pa+Pb, the i.e. actual aperture P=reference opening amounts Pa+ automatic adjustment apertures Pb of electric expansion valve to automatically adjust aperture.And
Meet following relation between automatic adjustment aperture Pb and real-time degree of superheat T, during T≤- 5, Pb=-18；During -5 ＜ T ＜ -2, Pb=-
8；During -2≤T ＜ 0, Pb=0；During 0≤T ＜ 2, Pb=+5；During T >=2, Pb=+15 can also be referring to following table, wherein in following table
Expansion school inspection value be electric expansion valve automatic adjustment aperture Pb.
5th step, it is real if the resistance value of suction temperature sensor or evaporating temperature sensor exceeds error range or failure
When degree of superheat T be not involved in automatically adjusting, electric expansion valve is opened to corresponding reference opening amount；If during into defrosting mode, electronic expansion
Valve is opened to defrosting aperture, after exiting defrosting, is recovered to original aperture；Other patterns then enter step (6).
6th step, if during outlet air temperature Td >=98, the degree of superheat does not participate in automatic adjustment, does not allow to turn down electric expansion valve
Aperture, and the aperture of electric expansion valve opened big by 3 × (Td-97) step every 24 seconds；If during 98 DEG C of 95 DEG C of ＜ Td ＜, mistake
Temperature does not participate in automatic adjustment, does not allow the aperture for turning down electric expansion valve, and the aperture of electric expansion valve will increase；If Td≤95
DEG C, the aperture of electric expansion valve gradually recovers normal, participates in Pb verifications, performs P=Pa+Pb.
The present invention is according to outlet air temperature Td, to determine the actual aperture P=reference opening amounts Pa+ automatic adjustments of electric expansion valve
Aperture Pb according to the variation tendency of delivery temperature, is adjusted, effectively accordingly in the adjustable range of final electric expansion valve
It is rational to adjust the aperture of electric expansion valve, while the resistance value of suction temperature sensor or evaporating temperature sensor can also be avoided
Cause the situation of system crash beyond error range or failure, substantially increase the security of product, enter defrosting mode
When, it can also freely adjust.
Start operation electric expansion valve can be there are two intrinsic open range, to obtain first adjustable range；In real time
Obtain a current frequency of frequency-changeable compressor, and the electric expansion valve according to corresponding to pre-set press running frequency
Adjustable range, obtain second adjustable range；According to the real-time degree of superheat T of acquisition frequency-changeable compressor and by accurately counting
It calculates, a final adjustable range as electric expansion valve；A variation of delivery temperature is gathered, according to outlet air temperature Td's
Variation tendency is adjusted accordingly in the adjustable range of final electric expansion valve, substantially increases air-source water heater work
The flexibility ratio of work.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention god.
Claims (2)
1. a kind of control method of air-source water heater electric expansion valve, which is characterized in that comprise the following steps：
(1) air-source water heater is provided, there is a control system, control system is main including line control machine, indoor mainboard, outdoor
Plate and driving plate, line control machine are communicated to connect with indoor mainboard, and indoor mainboard is communicated to connect with outdoor mainboard and driving plate, and interior is main
Plate is connected with indoor water pump, electrical heating, and outdoor mainboard and driving plate are connected with frequency-changeable compressor, wind turbine, four-way valve, electronic expansion
Valve, exhaust gas temperature sensor, suction temperature sensor, evaporating temperature sensor, outer shroud temperature sensor；
(2) air-source water heater is started shooting, electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax, then opens to first
Beginning aperture P0, the frequency of frequency-changeable compressor rise or fall, and electric expansion valve is followed out to corresponding reference opening amount；
(3) after running seven minutes, exhaust gas temperature sensor, suction temperature sensor, detect frequency conversion at evaporating temperature sensor respectively
Outlet air temperature Td, suction temperature Ts, the evaporating temperature Top of compressor；
(4) control system calculates the real-time degree of superheat T, T=Ts-Top according to suction temperature and evaporating temperature, and records, fixed simultaneously
The actual aperture of adopted electric expansion valve is P, and the reference opening amount of electric expansion valve is Pa, and the automatic adjustment aperture of electric expansion valve is
Pb, P=Pa+Pb, and automatically adjust and meet following relation between aperture Pb and real-time degree of superheat T, during T≤- 5, Pb=-18；-5
During ＜ T ＜ -2, Pb=-8；During -2≤T ＜ 0, Pb=0；During 0≤T ＜ 2, Pb=+5；During T >=2, Pb=+15；
(5) if the resistance value of suction temperature sensor or evaporating temperature sensor exceeds error range or failure, real-time degree of superheat T
It is not involved in automatically adjusting, electric expansion valve is opened to corresponding reference opening amount；If during into defrosting mode, electric expansion valve is opened to defrosting
Aperture after exiting defrosting, is recovered to original aperture；Other patterns then enter step (6)；
(6) if during outlet air temperature Td >=98 DEG C, the degree of superheat does not participate in automatic adjustment, does not allow to turn down opening for electric expansion valve
Degree, and the aperture of electric expansion valve opened big by 3 × (Td-97) step every 24 seconds；If during 98 DEG C of 95 DEG C of ＜ Td ＜, the degree of superheat
Automatic adjustment is not participated in, does not allow the aperture for turning down electric expansion valve, and the aperture of electric expansion valve will increase；If Td≤95 DEG C,
The aperture of electric expansion valve gradually recovers normal, participates in Pb verifications, performs P=Pa+Pb.
2. a kind of control method of air-source water heater electric expansion valve as described in claim 1, it is characterised in that：The change
Each frequency of frequency compressor corresponds to reference opening amount Pa of the electronic expansion valve opening data deposit control system as frequency-changeable compressor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510728573.0A CN105371499B (en) | 2015-10-30 | 2015-10-30 | A kind of control method of air-source water heater electric expansion valve |
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| CN201510728573.0A CN105371499B (en) | 2015-10-30 | 2015-10-30 | A kind of control method of air-source water heater electric expansion valve |
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| CN105371499B true CN105371499B (en) | 2018-05-29 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106931639B (en) * | 2017-02-09 | 2023-10-24 | 青岛海尔新能源电器有限公司 | Control method for throttle element of heat pump water heater |
| CN107023945A (en) * | 2017-04-01 | 2017-08-08 | 青岛海尔空调电子有限公司 | Air-conditioning system and the control method for air-conditioning system |
| CN107120953A (en) * | 2017-04-11 | 2017-09-01 | 贵州九科新能源有限公司 | The control device for electronic expansion valve and method of a kind of air source heat pump dryer |
| CN107166594A (en) * | 2017-06-19 | 2017-09-15 | 青岛海尔空调器有限总公司 | A kind of air conditioner, control method and control device |
| CN107655246A (en) * | 2017-09-15 | 2018-02-02 | 广东芬尼能源技术有限公司 | It is a kind of effectively to prevent from being vented too low double electronic expansion-valve control system and method |
| CN107940843A (en) * | 2017-11-03 | 2018-04-20 | 宁波奥克斯电气股份有限公司 | A kind of frequency-changeable compressor reduces the control method and device of compression ratio |
| CN112503792B (en) * | 2020-11-30 | 2022-08-02 | 广东积微科技有限公司 | Low-temperature heat pump water machine enhanced vapor injection system and control method thereof |
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| JPH10141744A (en) * | 1996-11-12 | 1998-05-29 | Fujitsu General Ltd | Control of air conditioner |
| JP3890870B2 (en) * | 2000-09-08 | 2007-03-07 | 株式会社日立製作所 | Air conditioner |
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|---|---|---|---|---|
| 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 |
| CN102368009A (en) * | 2011-11-09 | 2012-03-07 | 宁波奥克斯电气有限公司 | Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner |
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