CN103471275B - Enhanced vapor injection air-conditioning circulating system and its control method - Google Patents
Enhanced vapor injection air-conditioning circulating system and its control method Download PDFInfo
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Abstract
The present invention relates to a kind of central air conditioner system,Specifically,It is related to a kind of air-cooled ducted air conditioner,The tonifying Qi side electronic expansion valve controls of the enhanced vapor injection air-conditioning circulating system of the present invention are changed to discharge superheat design by the control of the tonifying Qi degree of superheat,While high discharge superheat is ensured,By tonifying Qi can further lifting system heating capacity,Frequency conversion press is applied to by it,Higher heating capacity can be kept under different operating frequencys,And system run all right,Fluctuate small,It includes controller,Compressor,Four-way valve,Gas-liquid separator,Economizer,Magnetic valve and refrigerant pipe,Compressor is arranged to frequency-changeable compressor,Economizer is arranged to plate type heat exchanger,By electronic expansion valve controls tonifying Qi,The technical program tonifying Qi side electronic expansion valve controls are changed to discharge superheat design by the control of the tonifying Qi degree of superheat,While high discharge superheat is ensured,By tonifying Qi can further lifting system heating capacity,Frequency conversion press is applied to by it,Higher heating capacity can be kept under different operating frequencys,And system run all right,Fluctuate small.
Description
Technical field
The present invention relates to a kind of central air conditioner system, specifically, is related to a kind of air-cooled ducted air conditioner.
Background technology
There is cooling or heating effect and be limited by environment temperature in existing air conditioner and heat pump water-heating machine, if heating mode
Under, if ambient temperature is too low, performance of refrigerant systems decay is very big, and system can not give full play to its due ability and section
Energy property, the defect cause heat pump type air conditioning system not used in cold district effectively, limit its use range.Tonifying Qi at present
Increasing enthalpy two-stage compression system uses invariable frequency compressor more, when using frequency-changeable compressor, in different compressors frequency and indoor and outdoor
At a temperature of the air compensation of compressor is difficult to accurately control, the performance of compressor can be impacted.Meanwhile if indoor heat exchange
The flow of air supply distribution of the cold medium flux and compressor of device causes compressor performance to decline when bad, or due to tonifying Qi side refrigerant
Heat transfer effect difference and cause the tonifying Qi side refrigerant degree of superheat is too low to produce liquid hammer and badly damaged compressor.
Patent No. CN202692341《Air conditioner circulating system》In a kind of Gas-supplying enthalpy-increasing air conditioner circulating system for mentioning.Using
Economizer be flash vessel, compressor is rotor-type compressor.By setting the first temperature sensing device at compressor gas supplementing opening, together
When at the flash vessel first interface that gas supplementing opening is connected set the second temperature sensing device, can be connected to compressor gas supplementing opening with
The temperature on tonifying Qi loop between flash vessel first interface is grasped, and is mended so as to be controlled by first flow adjusting means
Air inflow in air circuit, and then improve the performance purpose of compressor.
First, the economizer used in Gas-supplying enthalpy-increasing system that above-mentioned patent is illustrated is flash vessel, belongs to pressure vessel, pressure
The application of force container all has strict requirement from designing and producing, and volume is larger is not easy to refrigeration system pipeline
Design and connection；Secondly, above-mentioned patent adjusts throttling arrangement by the degree of superheat for controlling flash vessel tonifying Qi side refrigerant to import and export
Aperture, find that the aperture fluctuation of this kind of control mode electric expansion valve is very big in experiment, have a strong impact on the stabilization of system
Operation.The compressor that last said system uses is rotor press, and rotor press is all less than vortex in performance and stabilization
Compressor.
The content of the invention
The tonifying Qi side electronic expansion valve controls of the enhanced vapor injection air-conditioning circulating system of the present invention are controlled by the tonifying Qi degree of superheat
Be changed to discharge superheat design, while high discharge superheat is ensured, by tonifying Qi can further lifting system system
Heat energy power, frequency conversion press is applied to by it, higher heating capacity, and system operation can be kept under different operating frequencys
Stable, fluctuation is small.
In order to achieve the above object, the technical solution adopted by the present invention is：
The technical scheme of the enhanced vapor injection air-conditioning circulating system of the present invention is such：It include controller, compressor,
Four-way valve, gas-liquid separator, economizer, magnetic valve and refrigerant pipe, compressor are arranged to frequency-changeable compressor, and economizer is arranged to
Plate type heat exchanger, by electronic expansion valve controls tonifying Qi.
The technical scheme of the control method of the enhanced vapor injection air-conditioning circulating system of the present invention is such：It passes through monitoring
The aperture of the discharge superheat control electric expansion valve of compressor outlet, its control method comprise the following steps：
Ⅰ：Controller detects air-conditioning in refrigeration or under heating state, if in refrigerating state, detects compressor
Frequency, judges whether the frequency of compressor is less than setting value A, and if less than setting value A, electric expansion valve is closed, if not small
In setting value A, then into step III；If in heating state, whether the frequency for detecting compressor is less than setting value A, if
Closed less than electric expansion valve；Enter step II if being not less than；
Ⅱ：Judge whether outdoor temperature is less than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve closes
Close；If it is less than setting value C, into step III；
Ⅲ：The discharge superheat of frequency-changeable compressor outlet is detected, if discharge superheat is less than setting value B, electronics is swollen
The aperture of swollen valve increases numerical value ⊿ EVB, ⊿ an EVB numerical basis calculation formula and obtained, and is set if discharge superheat is not less than
Definite value B, then the aperture holding of electric expansion valve 2 is constant.
Optimally, setting value A scope is greater than being equal to 30 hertz less than or equal to 50 hertz.
Optimally, setting value B is more than or equal to 7 degrees Celsius and is less than or equal to 12 degrees Celsius.
Optimally, setting value C is more than or equal to 30 degrees Celsius and is less than or equal to 35 degrees Celsius.
Optimally, the calculation formula Wei ⊿ EVB=Kp of step III × { ⊿ Td (n)-⊿ Td (n-1) }+Ki × ⊿ Td (n)+
The DEG C , ⊿ Td of Kd × { × ⊿ Td (n-1) the+⊿ Td of ⊿ Td (n) -2 (n-2) }, Qi Zhong ⊿ Td (n)=Td- (Tdo+2) ≈ 30~35
(n-1) it is that (Hui ⊿ Td (n), Tdo are actual motion pressure pair to upper Yi ⊿ Td (n) , ⊿ Td before n-2) Shi ⊿ Td (n-1)
The saturation temperature answered, Kp, Ki, Kd is PID control constant, when air-conditioning just starts, Kp=0.8, Ki=0.2, Kd=0；Air-conditioning
After stable, Kp=0.4, Ki=0.25, it is 50pls that Kd=0.1, EVB, which start initial opening,.
The technical program tonifying Qi side electronic expansion valve controls are changed to discharge superheat design by the control of the tonifying Qi degree of superheat, are protecting
While demonstrate,proving high discharge superheat, by tonifying Qi can further lifting system heating capacity, frequency conversion pressure is applied to by it
Machine, higher heating capacity, and system run all right can be kept under different operating frequencys, fluctuated small.
The technical program uses frequency-changing cyclone formula air supply compressor, no matter in heating capacity and system energy efficiency level etc.
Better than existing determines frequency air supply compressor.
The economizer of the technical program is all an advantage over using plate type heat exchanger from reliability of operation and installation
Flash vessel.
Brief description of the drawings
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；
1- frequency-changeable compressors, 2- oil eliminators, 3- capillaries 1,4- magnetic valves 1,5- check valves, 6- gas-liquid separators, 7-
Capillary 2,8- magnetic valves 2,9- four-way valves, 10- outdoor heat exchangers, 11- electric expansion valves 1,12- electric expansion valves 2,13- plates
Formula heat exchanger, 14- high pressures fluid reservoir, 15- indoor heat exchangers, 16- gas side stop valve, 17- liquid side stop valve, 18- electronic expansions
Valve 3,19- temperature sensing devices, 20- fluorine water- to-water heat exchanger, 21- water side stop valve 1,22- water side stop valve 2,23- water collecting and diversifying devices, 24- water
Stream switch, 25- grounding heat coil tubes.
Embodiment
Embodiment 1：
The present invention enhanced vapor injection air-conditioning circulating system it include controller, compressor, four-way valve, gas-liquid separator,
Economizer, magnetic valve and refrigerant pipe, compressor are arranged to frequency-changeable compressor, and economizer is arranged to plate type heat exchanger, by electronics
Expansion valve controls tonifying Qi.
The control method of the enhanced vapor injection air-conditioning circulating system of the present invention comprises the following steps：
Ⅰ：Controller detects air-conditioning in refrigeration or under heating state, if in refrigerating state, detects compressor
Frequency, judges whether the frequency of compressor is less than setting value A, and if less than setting value A, electric expansion valve is closed, if not small
In setting value A, then into step III；If in heating state, whether the frequency for detecting compressor is less than setting value A, if
Closed less than electric expansion valve；Enter step II if being not less than；
Ⅱ：Judge whether outdoor temperature is less than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve closes
Close；If it is less than setting value C, into step III；
Ⅲ：The discharge superheat of frequency-changeable compressor outlet is detected, if discharge superheat is less than setting value B, electronics is swollen
The aperture of swollen valve increases a numerical value, and numerical basis calculation formula obtains, if discharge superheat is not less than setting value B, electricity
The aperture of sub- expansion valve 2 keeps constant.
The present embodiment setting value A is set as 40 hertz.Setting value B is set as 10 degrees Celsius.Setting value C is set as that 32 is Celsius
Degree.The calculation 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) }, on the DEG C , ⊿ Td (n-1) of Qi Zhong ⊿ Td (n)=Td- (Tdo+2) ≈ 30~35 are
(Hui ⊿ Td (n), Tdo are saturation temperature corresponding to actual motion pressure to Yi ⊿ Td (n) , ⊿ Td before n-2) Shi ⊿ Td (n-1)
Degree, Kp, Ki, Kd are PID control constants, when air-conditioning just starts, Kp=0.8, Ki=0.2, Kd=0；After operation of air conditioner is stable,
It is 50 that Kp=0.4, Ki=0.25, Kd=0.1, EVB, which start initial opening,.
As shown in Fig. 2 1- frequency-changeable compressors, 2- oil eliminators, the 3- of the enhanced vapor injection air-conditioning circulating system of the present invention
Capillary 1,4- magnetic valves 1,5- check valves, 6- gas-liquid separators, 7- capillaries 2,8- magnetic valves 2,9- four-way valves, outside 10- rooms
Heat exchanger, 11- electric expansion valves 1,12- electric expansion valves 2,13- plate type heat exchangers, 14- high pressures fluid reservoir, exchange heat in 15- rooms
Device, 16- gas side stop valve, 17- liquid side stop valve, 18- electric expansion valves 3,19- temperature sensing devices, in heating according to Fig. 2 stream
Journey figure is operated.
As shown in figure 3, the 1- frequency-changeable compressors of enhanced vapor injection air-conditioning circulating system of the present invention, 2- oil eliminators, 3- hairs
Tubule 1,4- magnetic valves 1,5- check valves, 6- gas-liquid separators, 7- capillaries 2,8- magnetic valves 2,9- four-way valves, 10- are changed outside room
Hot device, 11- electric expansion valves 1,12- electric expansion valves 2,13- plate type heat exchangers, 14- high pressures fluid reservoir, 15- indoor heat exchangers,
16- gas side stop valve, 17- liquid side stop valve, 18- electric expansion valves 3,19- temperature sensing devices, in refrigeration according to Fig. 3 flow
Figure is operated.
The present embodiment is set for 4-7 air-conditioning.
Embodiment 2：
The difference of the present embodiment and embodiment 1 is that the present embodiment is multi-connected air conditioner, and the present embodiment setting value A is set
For 30 hertz.Setting value B is set as 7 degrees Celsius.Setting value C is set as 30 degrees Celsius.
Embodiment 3：
The difference of the present embodiment and embodiment 1 is that the present embodiment is compound functional form air-conditioning, and it also includes 20- fluorine
Water- to-water heat exchanger, 21- water side stop valve 1,22- water side stop valve 2,23- water collecting and diversifying devices, 24- water flow switches, 25- grounding heat coil tubes, its
Middle the present embodiment setting value A is set as 50 hertz.Setting value B is set as 12 degrees Celsius.Setting value C is set as 35 degrees Celsius.
Claims (5)
1. a kind of control method of enhanced vapor injection air-conditioning circulating system, it is characterised in that it is by monitoring compressor outlet
Discharge superheat controls the aperture of electric expansion valve, and its control method comprises the following steps：
Ⅰ：Controller detects air-conditioning in refrigeration or under heating state, if in refrigerating state, detects the frequency of compressor,
Judge whether the frequency of compressor is less than setting value A, if less than setting value A, electric expansion valve is closed, if not less than setting
Value A, then into step III；If in heating state, whether the frequency for detecting compressor is less than setting value A, if less than electricity
Sub- expansion valve is closed；Enter step II if being not less than；
Ⅱ：Judge whether outdoor temperature is less than setting value C, if outdoor temperature is not less than setting value C, electric expansion valve is closed；
If it is less than setting value C, into step III；
Ⅲ：The discharge superheat of frequency-changeable compressor outlet is detected, if discharge superheat is less than setting value B, electric expansion valve
Aperture increase numerical value ⊿ EVB, ⊿ an EVB numerical basis calculation formula obtain, if discharge superheat is not less than setting value
B, then the aperture holding of electric expansion valve is constant；
The calculation 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) }, on the DEG C , ⊿ Td (n-1) of Qi Zhong ⊿ Td (n)=Td- (Tdo+2) ≈ 30~35 are
(Hui ⊿ Td (n), Tdo are saturation temperature corresponding to actual motion pressure to Yi ⊿ Td (n) , ⊿ Td before n-2) Shi ⊿ Td (n-1)
Degree, Kp, Ki, Kd are PID control constants.
2. the control method of enhanced vapor injection air-conditioning circulating system according to claim 1, it is characterised in that setting value A
Scope be greater than be equal to 30 hertz be less than or equal to 50 hertz.
3. the control method of enhanced vapor injection air-conditioning circulating system according to claim 1, it is characterised in that setting value B
It is less than or equal to 12 degrees Celsius more than or equal to 7 degrees Celsius.
4. the control method of enhanced vapor injection air-conditioning circulating system according to claim 1, it is characterised in that setting value C
It is less than or equal to 35 degrees Celsius more than or equal to 30 degrees Celsius.
5. the control method of enhanced vapor injection air-conditioning circulating system according to claim 1, it is characterised in that step III
In calculation formula, when air-conditioning just starts, Kp=0.8, Ki=0.2, Kd=0；After operation of air conditioner is stable, Kp=0.4, Ki=
It is 50pls that 0.25, Kd=0.1, EVB, which start initial opening,.
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