CN103471275A - Enhanced vapor injection air-conditioning circulating system and control method thereof - Google Patents
Enhanced vapor injection air-conditioning circulating system and control method thereof Download PDFInfo
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Abstract
The invention relates to a central air-conditioning system, in particular to a duct air conditioner, namely an enhanced vapor injection air-conditioning circulating system. A vapor injection side electronic expansion valve of the system is subject to discharge superheat control instead of vapor injection superheat control; high discharge superheat is guaranteed, and heating capacity of the system can be further improved by vapor injection; the system is especially applicable to variable frequency compressors; high heating capacity is kept even under different operating frequencies; the system operates stably and fluctuates little. The enhanced vapor injection air-conditioning circulating system comprises a controller, a compressor, a four-way valve, a vapor-liquid separator, an economizer, a solenoid valve and a coolant pipe. The compressor is a variable frequency compressor. The economizer is a plate economizer. The electronic expansion valve controls vapor injection. The vapor injection electronic expansion valve is subject to discharge superheat control instead of vapor injection superheat control; accordingly, high discharge superheat is guaranteed, and heating capacity of the system is further improved by vapor injection. The system is especially applicable to variable frequency compressors; the heating capacity is kept even under different operating frequencies; the system operates stably and fluctuates little.
Description
Technical field
The present invention relates to a kind of central air conditioner system, specifically, relate to a kind of air-cooled ducted air conditioner.
Background technology
Existing air-conditioner and heat pump water-heating machine exist cooling or heating effect to be limited by environment temperature, if under heating mode, if ambient temperature is too low, the performance of refrigerant systems decay is very large, system can't be given full play to its due ability and energy saving, this defect causes heat pump type air conditioning system effectively to use at cold district, has limited its scope of application.Tonifying Qi at present increases the enthalpy two-stage compression system and adopts invariable frequency compressor more, and when adopting frequency-changeable compressor, the air compensation to compressor under different compressors frequency and indoor and outdoor temperature is difficult to accurate control, can the performance of compressor be impacted.Simultaneously, if cause compressor performance to descend when the distribution of the flow of air supply of the cold medium flux of indoor heat exchanger and compressor is not good, or cause the too low generation liquid hammer of the tonifying Qi side refrigerant degree of superheat and badly damaged compressor because tonifying Qi side refrigerant heat transfer effect is poor.
A kind of tonifying Qi of mentioning in patent No. CN202692341 " in air conditioner circulating system " increases the enthalpy air conditioner circulating system.The economizer adopted is flash vessel, and compressor is rotor-type compressor.By at compressor gas supplementing opening place, the first temperature sensing device being set, the flash vessel first interface place be connected at gas supplementing opening arranges the second temperature sensing device simultaneously, can grasp the temperature be connected on the tonifying Qi loop between compressor gas supplementing opening and flash vessel first interface, thereby control the air inflow in the tonifying Qi loop by the first flow adjusting device, and then improve the performance purpose of compressor.
At first, it is flash vessel that the tonifying Qi that above-mentioned patent is set forth increases enthalpy system economizer used, belongs to pressure vessel, and the application of pressure vessel all has strict instructions for use from design and production, and volume is not easy to more greatly the refrigeration system pipeline design and is connected; Secondly, the aperture that above-mentioned patent is regulated throttling arrangement by the degree of superheat of controlling flash vessel tonifying Qi side refrigerant and importing and exporting, very large of the aperture fluctuation of finding this kind of control mode electric expansion valve in test, have a strong impact on the stable operation of system.The compressor that last said system adopts is the rotor press, and the rotor press is all lower than scroll compressor in performance with on stablizing.
Summary of the invention
Tonifying Qi of the present invention increases the tonifying Qi side electronic expansion valve controls of the air conditioner circulating system of enthalpy and is controlled and changed into the discharge superheat design by the tonifying Qi degree of superheat, when guaranteeing high discharge superheat, by the further heating capacity of elevator system of tonifying Qi, be applicable to the frequency conversion press by it, all can keep higher heating capacity under different operating frequencys, and system run all right, fluctuate little.
The technical scheme that tonifying Qi of the present invention increases the air conditioner circulating system of enthalpy is such: it comprises controller, compressor, cross valve, gas-liquid separator, economizer, magnetic valve and refrigerant pipe, compressor is set to frequency-changeable compressor, economizer is set to plate type heat exchanger, by the electronic expansion valve controls tonifying Qi.
The technical scheme of control method that tonifying Qi of the present invention increases the air conditioner circulating system of enthalpy is such: its discharge superheat by the monitoring compressor outlet is controlled the aperture of electric expansion valve, and its control method comprises the following steps:
I: controller detects air-conditioning in refrigeration or is heating under state, if at refrigerating state, detects the frequency of compressor, if whether the frequency of compressor is less than setting value A, if be less than setting value A, electric expansion valve is closed, if be not less than setting value A, enter the step III; If heating state, whether the frequency that detects compressor is less than setting value A, if be less than electric expansion valve, closes; If be not less than enter the step II;
II: judge that whether outdoor temperature is lower than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve is closed; If, lower than setting value C, enter the step III;
III: the discharge superheat that detects the frequency-changeable compressor outlet, if discharge superheat is less than setting value B, the aperture of electric expansion valve increases a numerical value ⊿ EVB; ⊿ EVB numerical basis computing formula obtains, if discharge superheat is not less than setting value B, the aperture of electric expansion valve 2 remains unchanged.
Optimally, the scope of setting value A is to be more than or equal to 30 hertz to be less than or equal to 50 hertz.
Optimally, setting value B is more than or equal to 7 degrees centigrade and is less than or equal to 12 degrees centigrade.
Optimally, setting value C is more than or equal to 30 degrees centigrade and is less than or equal to 35 degrees centigrade.
Optimally, the computing formula Wei ⊿ EVB=Kp of step III * { ⊿ Td (n)-⊿ Td (n-1) }+Ki × ⊿ Td (n)+Kd * { ⊿ Td (n)-2 × ⊿ Td (n-1)+⊿ Td (n-2) } Qi Zhong ⊿ Td (n)=Td-(Tdo+2 of) 30 ~ 35 ℃ of ⊿ Td of ≈ (n-1) are upper Ge ⊿ Td (n) ⊿ Td (n-2) Shi ⊿ Td (n-1) front Hui ⊿ Td (n), Tdo is the saturation temperature that actual motion pressure is corresponding, Kp, Ki, Kd is the PID control constant, when air-conditioning has just started, and Kp=0.8, Ki=0.2, Kd=0; After operation of air conditioner is stable, Kp=0.4, Ki=0.25, Kd=0.1, it is 50pls that EVB starts initial opening.
The technical program tonifying Qi side electronic expansion valve controls is controlled and is changed into the discharge superheat design by the tonifying Qi degree of superheat, high in assurance
In the time of discharge superheat, by the further heating capacity of elevator system of tonifying Qi, by it, be applicable to the frequency conversion press, under different operating frequencys, all can keep higher heating capacity, and system run all right, fluctuate little.
The technical program adopts frequency-changing cyclone formula air supply compressor, at aspects such as heating capacity and system energy efficiency levels, all is better than
Existing determine the frequency air supply compressor.
It is all to be better than flash vessel from reliability of operation and installation aspect that the economizer of the technical program adopts plate type heat exchanger.
The accompanying drawing explanation
Fig. 1 is the structural representation of embodiments of the invention 1;
Fig. 2 is the flow chart of heating operation mode of the present invention;
Fig. 3 is the flow chart of cooling operation mode of the present invention;
Fig. 4 is the structural representation of the embodiment of the present invention 2;
Fig. 5 is the structural representation of the embodiment of the present invention 3.
The 1-frequency-changeable compressor, the 2-oil eliminator, 3-capillary 1, 4-magnetic valve 1, the 5-check valve, the 6-gas-liquid separator, 7-capillary 2, 8-magnetic valve 2, the 9-cross valve, the 10-outdoor heat exchanger, 11-electric expansion valve 1, 12-electric expansion valve 2, the 13-plate type heat exchanger, 14-high pressure fluid reservoir, the 15-indoor heat exchanger, 16-gas side stop valve, 17-liquid side stop valve, 18-electric expansion valve 3, the 19-temperature sensing device, 20-fluorine water-to-water heat exchanger, 21-water side stop valve 1, 22-water side stop valve 2, the 23-water collecting and diversifying device, the 24-water flow switch, the 25-grounding heat coil tube.
The specific embodiment
Embodiment 1:
Tonifying Qi of the present invention increase enthalpy air conditioner circulating system it comprise controller, compressor, cross valve, gas-liquid separator, economizer, magnetic valve and refrigerant pipe, compressor is set to frequency-changeable compressor, economizer is set to plate type heat exchanger, by the electronic expansion valve controls tonifying Qi.
The control method that tonifying Qi of the present invention increases the air conditioner circulating system of enthalpy comprises the following steps:
I: controller detects air-conditioning in refrigeration or is heating under state, if at refrigerating state, detects the frequency of compressor, if whether the frequency of compressor is less than setting value A, if be less than setting value A, electric expansion valve is closed, if be not less than setting value A, enter the step III; If heating state, whether the frequency that detects compressor is less than setting value A, if be less than electric expansion valve, closes; If be not less than enter the step II;
II: judge that whether outdoor temperature is lower than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve is closed; If, lower than setting value C, enter the step III;
III: the discharge superheat that detects the frequency-changeable compressor outlet, if discharge superheat is less than setting value B, the aperture of electric expansion valve increases a numerical value, and the numerical basis computing formula obtains, if discharge superheat is not less than setting value B, the aperture of electric expansion valve 2 remains unchanged.
The present embodiment setting value A is set as 40 hertz.Setting value B is set as 10 degrees centigrade.Setting value C is set as 32 degrees centigrade.The computing formula Wei ⊿ EVB=Kp of step III * { ⊿ Td (n)-⊿ Td (n-1) }+Ki × ⊿ Td (n)+Kd * { ⊿ Td (n)-2 × ⊿ Td (n-1)+⊿ Td (n-2) } Qi Zhong ⊿ Td (n)=Td-(Tdo+2 of) 30 ~ 35 ℃ of ⊿ Td of ≈ (n-1) are upper Ge ⊿ Td (n) ⊿ Td (n-2) Shi ⊿ Td (n-1) front Hui ⊿ Td (n), Tdo is the saturation temperature that actual motion pressure is corresponding, Kp, Ki, Kd is the PID control constant, when air-conditioning has just started, Kp=0.8, Ki=0.2, Kd=0; After operation of air conditioner is stable, Kp=0.4, Ki=0.25, Kd=0.1, it is 50 that EVB starts initial opening.
As shown in Figure 2, tonifying Qi of the present invention increases 1-frequency-changeable compressor, 2-oil eliminator, 3-capillary 1,4-magnetic valve 1,5-check valve, 6-gas-liquid separator, 7-capillary 2,8-magnetic valve 2,9-cross valve, 10-outdoor heat exchanger, 11-electric expansion valve 1,12-electric expansion valve 2,13-plate type heat exchanger, 14-high pressure fluid reservoir, 15-indoor heat exchanger, 16-gas side stop valve, 17-liquid side stop valve, 18-electric expansion valve 3, the 19-temperature sensing device of the air conditioner circulating system of enthalpy, and the flow chart according to Fig. 2 when heating is turned round.
As shown in Figure 3, tonifying Qi of the present invention increases 1-frequency-changeable compressor, 2-oil eliminator, 3-capillary 1,4-magnetic valve 1,5-check valve, 6-gas-liquid separator, 7-capillary 2,8-magnetic valve 2,9-cross valve, 10-outdoor heat exchanger, 11-electric expansion valve 1,12-electric expansion valve 2,13-plate type heat exchanger, 14-high pressure fluid reservoir, 15-indoor heat exchanger, 16-gas side stop valve, 17-liquid side stop valve, 18-electric expansion valve 3, the 19-temperature sensing device of the air conditioner circulating system of enthalpy, and the flow chart according to Fig. 3 when refrigeration is turned round.
The present embodiment arranges for 4-7 air-conditioning.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, the present embodiment is multi-connected air conditioner, and the present embodiment setting value A is set as 30 hertz.Setting value B is set as 7 degrees centigrade.Setting value C is set as 30 degrees centigrade.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is, the present embodiment is compound functional form air-conditioning, it also comprises 20-fluorine water-to-water heat exchanger, 21-water side stop valve 1,22-water side stop valve 2,23-water collecting and diversifying device, 24-water flow switch, 25-grounding heat coil tube, and wherein the present embodiment setting value A is set as 50 hertz.Setting value B is set as 12 degrees centigrade.Setting value C is set as 35 degrees centigrade.
Claims (6)
1. a tonifying Qi increases the air conditioner circulating system of enthalpy, it comprises controller, compressor, cross valve, gas-liquid separator, economizer, magnetic valve and refrigerant pipe, it is characterized in that, compressor is set to frequency-changeable compressor, economizer is set to plate type heat exchanger, by the electronic expansion valve controls tonifying Qi.
2. a tonifying Qi claimed in claim 1 increases the control method of the air conditioner circulating system of enthalpy, it is characterized in that, its discharge superheat by the monitoring compressor outlet is controlled the aperture of electric expansion valve, and its control method comprises the following steps:
I: controller detects air-conditioning in refrigeration or is heating under state, if at refrigerating state, detects the frequency of compressor, if whether the frequency of compressor is less than setting value A, if be less than setting value A, electric expansion valve is closed, if be not less than setting value A, enter the step III; If heating state, whether the frequency that detects compressor is less than setting value A, if be less than electric expansion valve, closes; If be not less than enter the step II;
II: judge that whether outdoor temperature is lower than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve is closed; If, lower than setting value C, enter the step III;
III: the discharge superheat that detects the frequency-changeable compressor outlet, if discharge superheat is less than setting value B, the aperture of electric expansion valve increases a numerical value ⊿ EVB; ⊿ EVB numerical basis computing formula obtains, if discharge superheat is not less than setting value B, the aperture of electric expansion valve 2 remains unchanged.
3. tonifying Qi according to claim 2 increases the control method of the air conditioner circulating system of enthalpy, it is characterized in that, the scope of setting value A is to be more than or equal to 30 hertz to be less than or equal to 50 hertz.
4. tonifying Qi according to claim 2 increases the control method of the air conditioner circulating system of enthalpy, it is characterized in that, setting value B is more than or equal to 7 degrees centigrade and is less than or equal to 12 degrees centigrade.
5. tonifying Qi according to claim 2 increases the control method of the air conditioner circulating system of enthalpy, it is characterized in that, setting value C is more than or equal to 30 degrees centigrade and is less than or equal to 35 degrees centigrade.
6. free static pressure air-cooled ducted air conditioner according to claim 2, it is characterized in that, the computing formula Wei ⊿ EVB=Kp of step III * { ⊿ Td (n)-⊿ Td (n-1) }+Ki × ⊿ Td (n)+Kd * { ⊿ Td (n)-2 × ⊿ Td (n-1)+⊿ Td (n-2) }, Qi Zhong ⊿ Td (n)=Td-(Tdo+2) ≈ is 30 ~ 35 ℃, ⊿ Td (n-1) is a upper Ge ⊿ Td (n), ⊿ Td (n-2) Shi ⊿ Td (n-1) front Hui ⊿ Td (n), Tdo is the saturation temperature that actual motion pressure is corresponding, Kp, Ki, Kd is the PID control constant, when air-conditioning has just started, Kp=0.8, Ki=0.2, Kd=0, after operation of air conditioner is stable, Kp=0.4, Ki=0.25, Kd=0.1, it is 50pls that EVB starts initial opening.
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