CN105371499A - Control method for electronic expansion valve of air energy water heater - Google Patents
Control method for electronic expansion valve of air energy water heater Download PDFInfo
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- CN105371499A CN105371499A CN201510728573.0A CN201510728573A CN105371499A CN 105371499 A CN105371499 A CN 105371499A CN 201510728573 A CN201510728573 A CN 201510728573A CN 105371499 A CN105371499 A CN 105371499A
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Abstract
The invention provides a control method for an electronic expansion valve of an air energy water heater. Two fixed opening ranges are available for the electronic expansion valve during booting operation, and a first adjusting range is obtained; one current frequency of an inverter compressor is obtained in real time, and a second adjusting range is obtained according to the adjusting range, corresponding to the preset operation frequency of the compressor, of the electronic expansion valve; the final adjusting range of the electronic expansion valve is achieved through collection of the real-time superheat degree T of the inverter compressor and accurate calculation; and one change of the exhaust temperature is collected, corresponding adjustment is conducted in the final adjusting range of the electronic expansion valve according to the variation trend of the exhaust temperature value Td, the operation frequency of the compressor can be combined in the final adjusting range, and the opening of the electronic expansion valve can be adjusted more efficiently and more reasonably. The working flexibility of the air energy water heater is greatly improved, and the breakdown of system is effectively avoided.
Description
Technical field
The present invention relates to a kind of control method of air-source water heater electric expansion valve.
Background technology
The air-source water heater used in the market, mainly through producing heat energy with air heat-exchange, has the advantage of solar water heater energy-saving and environmental protection, safety, solves again solar water heater and relies on sunlight to adopt heat and install the problem of inconvenience.Because air-source water heater is heated by medium and air exchange heat, electrical heating elements is not needed to contact with water, the danger of also just not leaking electricity, also eliminate the hidden danger that gas heater is poisoning and explode, more there is no the air pollution that fuel-oil water heater discharging waste gas causes, thus air-source water heater accept by users.
The operation principle of air-source water heater is roughly as follows: electric expansion valve throttling is calculated by the parameter collected temperature sensor, drive plate to air-source water heater sends regulating command and is outputed signal to electric expansion valve by drive plate, drives electronic expansion valve events.Electric expansion valve only needs a few second from standard-sized sheet to complete shut-down, and reaction quick action, can not there is static degree of superheat phenomenon, therefore the advantages such as Applicable temperature is low are widely used.Producer can all adopt the automatic regulative mode of the degree of superheat or the corresponding aperture mode of frequency-changeable compressor Frequency point when electronic expansion valve controls at present.Front a kind of precision to temperature sensor is higher, and easily when there is error or fault in certain temperature sensor whole heat pump or air-conditioning system will be in runaway condition, rear a kind of control mode does not participate in adjustment due to the degree of superheat, the ability of refrigeration system Adaptive change operating mode is not good enough, and need to drop into too much test to establish the electronic expansion valve opening of each Frequency point early stage in research and development, cause the waste greatly of manpower, material resources and financial resources.
Summary of the invention
The object of the invention is to the defect overcoming prior art, provide a kind of control method of air-source water heater electric expansion valve, it is wide that it has scope, the characteristic automatically regulated.
The present invention is achieved in that a kind of control method of air-source water heater electric expansion valve, and it comprises the following steps:
(1) air-source water heater is provided, it has a control system, control system comprises line control machine, indoor mainboard, outdoor mainboard and drive plate, line control machine and indoor mainboard communicate to connect, indoor mainboard and outdoor mainboard and drive plate communicate to connect, indoor mainboard is connected with indoor water pump, electrical heating, and outdoor mainboard and drive plate are connected with frequency-changeable compressor, blower fan, cross valve, electric expansion valve, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, outer shroud temperature sensor;
(2) started shooting by air-source water heater, electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax, then opens to initial opening P0, and the frequency of frequency-changeable compressor rises or declines, and electric expansion valve is followed out to corresponding reference opening amount;
(3) after running seven minutes, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, the outlet air temperature Td detecting frequency-changeable compressor respectively, suction temperature Ts, inlet temperature Top;
(4) control system calculates real-time degree of superheat T according to suction temperature and inlet temperature, T=Ts-Top, and record, the actual aperture simultaneously defining 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 regulate aperture Pb and meet following relation between degree of superheat T in real time, during T≤-5, Pb=-18; When-5 < T <-2, Pb=-8; During-2≤T < 0, Pb=0; During 0≤T < 2, Pb=+5; During T >=2, Pb=+15;
(5) if when the resistance of suction temperature sensor or inlet temperature sensor exceeds error range or fault, real-time degree of superheat T does not participate in automatic adjustment, and electric expansion valve is opened to corresponding reference opening amount; If when entering defrosting mode, electric expansion valve is opened to defrosting aperture, after exiting defrosting, returns to original aperture; Other patterns, then enter step (6);
(6) if outlet air temperature Td >=98 time, the degree of superheat does not participate in automatic adjustment, does not allow the aperture turning down electric expansion valve, and the aperture of electric expansion valve increases 3 × (T row-97 DEG C) with 24 second period; If during 95 < Td < 98, the degree of superheat does not participate in automatic adjustment, do not allow the aperture turning down electric expansion valve, the aperture of electric expansion valve will increase; If Td≤95, the aperture of electric expansion valve recovers normal gradually, participates in Pb verification, performs P=Pa+Pb.
Further, the corresponding electronic expansion valve opening data of each frequency of described frequency-changeable compressor are stored in the reference opening amount Pa of control system E side as frequency-changeable compressor.
The present invention is according to outlet air temperature Td, determine that electric expansion valve actual aperture P=reference opening amount Pa+ regulates aperture Pb automatically, according to the variation tendency of delivery temperature, regulate accordingly in the adjustable range of final electric expansion valve, the aperture of effective and reasonable adjustment electric expansion valve, the situation resistance of suction temperature sensor or inlet temperature sensor simultaneously also can being avoided to exceed error range or fault cause system crash, substantially increase the security of product, when entering into defrosting mode, all right free adjustment, substantially increase the flexibility ratio of air-source water heater work, effectively prevent systemic breakdown.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of the air-source water heater that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the workflow diagram of air-source water heater.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As Fig. 1-2, inventive embodiments provides a kind of control method of air-source water heater electric expansion valve, specifically refers to following detailed description.
The first step, one air-source water heater is provided, it has a control system, control system comprises line control machine, indoor mainboard, outdoor mainboard and drive plate, line control machine and indoor mainboard communicate to connect, indoor mainboard and outdoor mainboard and drive plate communicate to connect, indoor mainboard is connected with indoor water pump, electrical heating, and outdoor mainboard and drive plate are connected with frequency-changeable compressor, blower fan, cross valve, electric expansion valve, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, outer shroud temperature sensor.
Second step, started shooting by air-source water heater, electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax, then opens to initial opening P0, and the frequency of frequency-changeable compressor rises or declines, and electric expansion valve is followed out to corresponding reference opening amount.
3rd step, ran after seven minutes, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, the outlet air temperature Td detecting frequency-changeable compressor respectively, suction temperature Ts, inlet temperature Top.
4th step, control system calculates real-time degree of superheat T according to suction temperature and inlet temperature, T=Ts-Top, and record, the actual aperture simultaneously defining electric expansion valve is P, and the reference opening amount of electric expansion valve is Pa, the corresponding electronic expansion valve opening data of each frequency of described frequency-changeable compressor are stored in the reference opening amount Pa of control system E side as frequency-changeable compressor, the automatic adjustment aperture of electric expansion valve is Pb, P=Pa+Pb, and namely electric expansion valve actual aperture P=reference opening amount Pa+ regulates aperture Pb automatically.And automatically regulate aperture Pb and meet following relation between degree of superheat T in real time, during T≤-5, Pb=-18; When-5 < T <-2, Pb=-8; During-2≤T < 0, Pb=0; During 0≤T < 2, Pb=+5; During T >=2, Pb=+15, also can see table, and the expansion school inspection value wherein in following table is the automatic adjustment aperture Pb of electric expansion valve.
5th step, if when the resistance of suction temperature sensor or inlet temperature sensor exceeds error range or fault, real-time degree of superheat T does not participate in automatic adjustment, and electric expansion valve is opened to corresponding reference opening amount; If when entering defrosting mode, electric expansion valve is opened to defrosting aperture, after exiting defrosting, returns 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 the aperture turning down electric expansion valve, and the aperture of electric expansion valve increases 3 × (T row-97 DEG C) with 24 second period; If during 95 < Td < 98, the degree of superheat does not participate in automatic adjustment, do not allow the aperture turning down electric expansion valve, the aperture of electric expansion valve will increase; If Td≤95, the aperture of electric expansion valve recovers normal gradually, participates in Pb verification, performs P=Pa+Pb.
The present invention is according to outlet air temperature Td, determine that electric expansion valve actual aperture P=reference opening amount Pa+ regulates aperture Pb automatically, according to the variation tendency of delivery temperature, regulate accordingly in the adjustable range of final electric expansion valve, the aperture of effective and reasonable adjustment electric expansion valve, the situation resistance of suction temperature sensor or inlet temperature sensor simultaneously also can being avoided to exceed error range or fault cause system crash, substantially increase the security of product, when entering into defrosting mode, can also free adjustment.
Start operation electric expansion valve has two intrinsic open range, obtains first adjustable range; An ongoing frequency of real-time acquisition frequency-changeable compressor, and the adjustable range of electric expansion valve corresponding to the press running frequency pre-set, obtain second adjustable range; According to gathering the real-time degree of superheat T of frequency-changeable compressor and passing through to calculate accurately, as a final adjustable range of electric expansion valve; Gather a change of delivery temperature, according to the variation tendency of outlet air temperature Td, regulate accordingly in the adjustable range of final electric expansion valve, substantially increase the flexibility ratio of air-source water heater work.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a control method for air-source water heater electric expansion valve, is characterized in that, comprises the following steps:
(1) air-source water heater is provided, it has a control system, control system comprises line control machine, indoor mainboard, outdoor mainboard and drive plate, line control machine and indoor mainboard communicate to connect, indoor mainboard and outdoor mainboard and drive plate communicate to connect, indoor mainboard is connected with indoor water pump, electrical heating, and outdoor mainboard and drive plate are connected with frequency-changeable compressor, blower fan, cross valve, electric expansion valve, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, outer shroud temperature sensor;
(2) started shooting by air-source water heater, electric expansion valve follows frequency-changeable compressor standard-sized sheet closely to maximum opening Pmax, then opens to initial opening P0, and the frequency of frequency-changeable compressor rises or declines, and electric expansion valve is followed out to corresponding reference opening amount;
(3) after running seven minutes, exhaust gas temperature sensor, suction temperature sensor, inlet temperature sensor, the outlet air temperature Td detecting frequency-changeable compressor respectively, suction temperature Ts, inlet temperature Top;
(4) control system calculates real-time degree of superheat T according to suction temperature and inlet temperature, T=Ts-Top, and record, the actual aperture simultaneously defining 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 regulate aperture Pb and meet following relation between degree of superheat T in real time, during T≤-5, Pb=-18; When-5 < T <-2, Pb=-8; During-2≤T < 0, Pb=0; During 0≤T < 2, Pb=+5; During T >=2, Pb=+15;
(5) if when the resistance of suction temperature sensor or inlet temperature sensor exceeds error range or fault, real-time degree of superheat T does not participate in automatic adjustment, and electric expansion valve is opened to corresponding reference opening amount; If when entering defrosting mode, electric expansion valve is opened to defrosting aperture, after exiting defrosting, returns to original aperture; Other patterns, then enter step (6);
(6) if outlet air temperature Td >=98 time, the degree of superheat does not participate in automatic adjustment, does not allow the aperture turning down electric expansion valve, and the aperture of electric expansion valve increases 3 × (T row-97 DEG C) with 24 second period; If during 95 < Td < 98, the degree of superheat does not participate in automatic adjustment, do not allow the aperture turning down electric expansion valve, the aperture of electric expansion valve will increase; If Td≤95, the aperture of electric expansion valve recovers normal gradually, participates in Pb verification, performs P=Pa+Pb.
2. the control method of a kind of air-source water heater electric expansion valve as claimed in claim 1, is characterized in that: the corresponding electronic expansion valve opening data of each frequency of described frequency-changeable compressor are stored in the reference opening amount Pa of control system E side as frequency-changeable compressor.
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Cited By (7)
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| CN106931639A (en) * | 2017-02-09 | 2017-07-07 | 青岛海尔新能源电器有限公司 | A kind of Teat pump boiler restricting element control method |
| 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 |
| CN112503792A (en) * | 2020-11-30 | 2021-03-16 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106931639A (en) * | 2017-02-09 | 2017-07-07 | 青岛海尔新能源电器有限公司 | A kind of Teat pump boiler restricting element control method |
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| 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 |
| CN112503792A (en) * | 2020-11-30 | 2021-03-16 | 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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