CN103954063A - Refrigerating system with single-valve stepless adjustment of circulating concentration of mixed working medium and method thereof - Google Patents

Refrigerating system with single-valve stepless adjustment of circulating concentration of mixed working medium and method thereof Download PDF

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CN103954063A
CN103954063A CN201410167874.6A CN201410167874A CN103954063A CN 103954063 A CN103954063 A CN 103954063A CN 201410167874 A CN201410167874 A CN 201410167874A CN 103954063 A CN103954063 A CN 103954063A
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temperature difference
import
export
unit
setting value
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CN103954063B (en
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刘金平
李日新
许雄文
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/16—Receivers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/05—Refrigerant levels
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves

Abstract

The invention discloses a refrigerating system with single-valve stepless adjustment of the circulating concentration of a mixed working medium and a method thereof. The refrigerating system comprises a compressor unit, a condensation cooler unit, a heat-return heat exchanger unit, a throttling unit and an evaporator unit, wherein input parameters include an exhausting pressure value of a compressor, a temperature value of an inlet of a heat-return heat exchanger, a temperature value of an outlet of the heat-return heat exchanger, a temperature value of an inlet of the throttling unit, a temperature value of an outlet of the throttling unit and a temperature value of an outlet of an evaporator; the output parameter is an instruction for enabling a stepless adjusting valve of a circulating concentration and flow adjusting unit of the working medium of a controllable path to do corresponding actions. Corresponding to the requirement of different working conditions and adjustment of the refrigerating system with mixed working medium, an adjusting and control mechanism of the refrigerating system makes comparison according the preset value and the input parameters, and the circulating concentration of the working medium of the refrigerating system is changed or maintained by using the stepless adjusting valve to adjust the liquid level of a liquid storage tank, so that the refrigerating system can realize high-efficiency, stable and reliable operation under different working conditions.

Description

A kind of refrigeration system and method thereof of single valve step-less adjustment mixed working fluid circulation composition
Technical field
The present invention relates to Engineering Thermophysics and using energy source ambit, relate in particular to a kind of refrigeration system and method thereof of single valve step-less adjustment mixed working fluid circulation composition.
Background technology
In conventional art, adopt minimum effective cryogenic temperature that the single-stage vapor-compression refrigerant cycle of pure working medium or nearly azeotropic working medium can reach generally-40 DEG C of left and right, need to adopt multi-stage compression or the circulation of multistage overlapping if realize lower cryogenic temperature.In general, adopt two stages of compression can realize the cryogenic temperature of-60 DEG C of left and right, adopt the circulation of two-stage overlapping can realize the cryogenic temperature of-80 DEG C of left and right, will take the circulation of more than three grades overlapping but will realize-100 DEG C of even lower cryogenic temperatures.Therefore, along with the reduction of demand temperature, it is more complicated that refrigeration system becomes, and reliability reduces, and regulates difficulty to increase.After the eighties in 20th century, polybasic mixture throttling Refrigeration Technique obtains huge progress, as long as this technology makes to find suitable mixed working fluid and working medium concentration, can reach by single stage compress throttling refrigeration the low temperature of-100 DEG C～-200 DEG C, can become more effective refrigeration modes by the alternative traditional cascade refrigeration of warm area below-100 DEG C, and have broad application prospects.
Conventionally, according to existing technology, mixed work medium for throttling Refrigeration Technique can be divided into two classes: the one, by derivative and next " the mixed working fluid autocascade cycle " of general cold field overlapping circulation, parallel separating for several times, the repeatedly throttling (multistage interior overlapping) of the inner employing of its refrigeration unit, required progression is determined according to working fluids characteristic and required cryogenic temperature conventionally; The 2nd, realize " back-heating type polybasic mixture throttling kind of refrigeration cycle " that efficient backheat develops from low temperature field.Back-heating type polybasic mixture throttling kind of refrigeration cycle is compared mixed working fluid autocascade cycle flow process and is wanted simple, is applicable to the refrigerating plant of miniaturization.But no matter be the mixed work medium for throttling Refrigeration Technique of any form, if not adopting corresponding technological means is controlled, there are following defects in capital: (1) multicomponent mixture work medium cryogenic refrigeration system, owing to adopting strong non-azeotropic working medium, working medium is gas phase heat release substantially in condenser, condensator outlet has certain mass dryness fraction, can be excessively not cold.The high pressure of system operation is not subject to environment temperature control substantially, and is determined by working medium charging amount and system structure parameter.At the refrigeration system start-up course initial stage, whole system is basic all in higher temperature, and the most working medium that charges, also in gas phase state, therefore there will be the too high phenomenon of pressure at expulsion; (2) when Refrigeration Cycle Using Refrigerant Mixture enters after normal cooling condition, the working medium higher due to most boiling point liquefies, and now just there will be system pressure sharply to decline, the serious phenomenon that refrigerating capacity sharply reduces; (3) there is concentration sliding phenomenon in mixed working fluid in actual cycle process.Multicomponent mixture work medium refrigeration system is cooled to by start operating performance in the process of minimum temperature, due to the continuous decline of system temperature, working medium constantly liquefies, the feature of working medium liquefaction is more first to be liquefied than lower boiling working medium to high boiling working medium in the process of low temperature by high temperature, and gas-liquid two-phase flow velocity exists the feature of velocity-slip, liquid phase working fluid flowing velocity will be lower than gas-phase working medium flowing velocity.Now there will be working medium liquid phase to accumulate.For multicomponent mixture work medium refrigeration system, because liquid phase is accumulated the existence of phenomenon, the working medium actual cycle concentration of refrigeration system will depart from actual charge concentration, the i.e. slippage of working medium concentration.Due to this shortcoming, on the one hand, mixed working fluid actual cycle concentration is subject to the impact of the factors such as the size of actual operating mode, system, the working medium circulation concentration of actual motion is difficult to according to certain mixed working fluid filling quantity and charges concentration prediction, the Optimum charge and the concentration that is to say mixed working fluid are difficult to determine, determine its Optimum charge and charge concentration for the refrigeration system that uses ternary or the above mixed working fluid of ternary is more difficult, the system of different model all needs to be charged and drawn final filling quantity and concentration by a large amount of tests, and production cost is high.On the other hand, though same systems, under different warm area operating modes, refrigeration system needs different concentration just can reach the optimum efficiency of this warm area, this warm area operating mode optimal concentration of working medium circulation deviation of concentration, can make system effectiveness sharply decline, and even temperature can not be fallen.
For the first two defect, Chinese invention patent ZL200510042730.9 has reported a kind of mixed working fluid low temperature throttle refrigeration system with changeable air reservoir, and its core concept is the operating mode that the break-make by magnetic valve is carried out regulating system participation circulation industrial quality to control the air reservoir being connected with high-low pressure pipeline is controlled high-low pressure and system.Although the method can be controlled high-low pressure in rational scope, because the turnover of the gas of air reservoir causes the working medium concentration of actual participation kind of refrigeration cycle that uncontrollable variation occurs, can cause refrigeration system refrigeration performance degradation;
Chinese invention patent ZL201110061458.4 has reported a kind of deep cooling mixed work medium for throttling refrigerant system capacity, regulating working conditions and control method.Its core concept is that to enter a controlled path stable can prevent from the starting shooting Compressor Discharge Pressure of operating mode too high by controlling gases at high pressure, and regulate low pressure by the gas turnover of controlling controlled path stable can, make low pressure be unlikely to too low under worst cold case; In addition this controlled path stable can is in the time of start operating performance and fast cooling operating mode, circulating mass of refrigerant by pipeline bypass with minimizing refrigeration system, in the time of normal cooling condition, the cold-producing medium of controlled path stable can all participates in kind of refrigeration cycle to strengthen the flow of refrigeration system, make power maintain higher level, can realize the adjusting of refrigerant system capacity and operating mode by controlling the turnover of this controlled path stable can cold-producing medium.Shortcoming is to switch air accumulator gas whether to participate in circulation and regulate the working medium circulation concentration of refrigeration system in the situation of high-low pressure that certain variation all can occur, this can allow system under specific operating mode due to the optimum circulation composition of working medium circulation deviation of concentration, cause decrease in efficiency, especially in fast cooling process, in the time that this process is incipient, evaporating temperature is higher, and under worst hot case, the large percentage of the working medium circulation concentration requirement heavy constituent of system just can reach preferably circulation composition.
For the 3rd shortcoming, also do not report that both at home and abroad relevant measure goes to overcome.
In fact, the different warm area operating mode refrigeration systems of requirement according to to(for) optimum working medium circulation concentration, if can regulate the working medium circulation concentration of worst hot case to lay particular stress on by control device, can allow like this working medium circulation concentration more approach optimal concentration, raise the efficiency, increase refrigerating capacity, the temperature fall time of high-temperature region is further shortened; As a same reason, in the process of fast cooling, when temperature drops to middle warm area operating mode, the concentration that the optimum working medium circulation concentration of system is no longer high-temperature region operating mode, it requires heavy constituent ratio decline in working medium circulation concentration now just can make regenerator heat exchange Curve Matching obtain better, therefore, now also need to regulate by control device according to operating mode the working medium circulation concentration of refrigeration system, make working medium circulation concentration be more suitable for the operating mode of this warm area.By regulating suitable concentration to guarantee that the efficiency of system is higher, in general, after adjusting concentration, the power of system changes not quite like this, but efficiency can improve; And do not do concentration adjustment, just increase flow remove to increase power may be because there is variation in concentration, refrigerating efficiency cannot improve, obviously, this way effect compared with adjusting concentration is bad and do not have an energy saving.Therefore, in the fast cooling stage, just can be by the concentration of the more approaching optimum of adjustment working medium circulation concentration greatly to accelerate the cooling rate of different warm areas, whole temperature fall time will shorten greatly.
So, no matter be for refrigeration system is lowered the temperature down, still make refrigeration system under each warm area operates in preferably working medium circulation concentration, to take certain technological means to control to the working medium circulation concentration of system necessary.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of refrigeration system and method thereof of single valve step-less adjustment mixed working fluid circulation composition is provided, realize refrigeration system fast cooling, keep the effect of greater efficiency stable operation.
The present invention is achieved through the following technical solutions:
A refrigeration system for single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture comprises that pipeline is successively connected and forms the compressor unit with lubricating oil separation device, condensate cooler unit, Recuperative heat exchanger unit, throttling unit and the evaporator unit in loop;
On pipeline between described condensate cooler unit and Recuperative heat exchanger unit, be also connected with a controlled path working medium circulation concentration flow regulating unit;
Described Refrigeration Cycle Using Refrigerant Mixture, also comprise a control module, poor, the outlet temperature of evaporator unit 5, regenerator heat exchanger unit 3 inlet temperatures, Recuperative heat exchanger unit 3 outlet temperatures, the combination poor or above-mentioned arbitrary parameter of Recuperative heat exchanger unit 3 out temperatures that described control module 7 gathers outlet temperature, throttling unit 4 out temperatures of inlet temperature, the throttling unit 4 of compressor unit 1 pressure at expulsion, throttling unit 4 regulates the aperture of controlled major loop step-less adjustment valve as feedback signal;
Described controlled path working medium circulation concentration flow regulating unit comprises: have gas-liquid separating function fluid reservoir S, controlled major loop step-less adjustment valve, go out tank check valve, its connected mode is: described controlled major loop step-less adjustment valve entrance point connects fluid reservoir S top gaseous phase outlet, this controlled major loop step-less adjustment valve outlet port end connects first import of a tee pipe fitting A, and second import of this tee pipe fitting is connected with the port of export that goes out tank check valve; The described entrance point that goes out tank check valve communicates with the bottom liquid phases port of export of fluid reservoir S; The entrance point of described fluid reservoir S is connected with the high-pressure refrigerant port of export of condensate cooler unit refrigerant outlet end or Recuperative heat exchanger unit, and the port of export of described tee pipe fitting A is connected with the high-pressure refrigerant entrance point of Recuperative heat exchanger unit.
Described controlled major loop step-less adjustment valve is the magnetic valve of step-less adjustment aperture or the manual adjustments valve of manual adjustments aperture.
The control method of Refrigeration Cycle Using Refrigerant Mixture working medium circulation concentration, comprises the steps:
(1) start operating performance step: controlled major loop step-less adjustment valve cuts out, whether control module reaches setting value according to the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters, judges whether to turn to controlled cooling operating mode process;
(2) controlled cooling operating mode step:
2-1) control module judges according to input parameter evaporator outlet temperature, the contrast of Compressor Discharge Pressure value, if the worst hot case of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve in 1/4th apertures, go out tank check valve in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve is determined according to the feedback of input parameter by control module, is specially:
A) Recuperative heat exchanger unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, reduce the aperture of controlled major loop step-less adjustment valve; Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, increase the aperture of controlled major loop step-less adjustment valve;
B) throttling unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, reduce controlled major loop step-less adjustment valve opening; Throttling unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, increase controlled major loop step-less adjustment valve opening;
2-2) control module judges according to the Compressor Discharge Pressure contrast of the outlet temperature of input parameter evaporator unit, condensate cooler unit, if the middle temperature operating mode of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: tank check valve is opened, gone out to controlled major loop step-less adjustment valve in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve is determined according to input parameter feedback by control module, is specially:
A) Recuperative heat exchanger unit import and export the temperature difference be less than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening reduces; Recuperative heat exchanger unit import and export the temperature difference be greater than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening increases;
B) throttling unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening reduces; Throttling unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening increases;
2-3) control module judges according to the Compressor Discharge Pressure of the evaporator outlet temperature of input parameter evaporator unit, condensate cooler unit and setting value contrast, if the worst cold case of system in controlled cooling operating mode, control method is as follows: tank check valve is opened, gone out to controlled major loop step-less adjustment valve in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve is determined according to input parameter feedback by control module, is specially:
A) Recuperative heat exchanger unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening reduces; Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening increases;
B) throttling unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening reduces; Throttling unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve opening increases;
(3) the normal refrigeration step of refrigeration system: controlled major loop valve keeps aperture.
The present invention, with respect to prior art, has following advantage and effect:
The present invention adopts control module output to control the aperture size of parameter with the controlled major loop step-less adjustment valve of instruction control controlled path working medium circulation concentration and flow regulating unit, realize the adjusting of refrigeration system working medium circulation concentration under different operating modes, overcome the shortcoming of current Refrigeration Cycle Using Refrigerant Mixture, saved energy consumption.
The technology of the present invention means are simple and easy to do, realize Refrigeration Cycle Using Refrigerant Mixture fast cooling, keep greater efficiency stable operation.
Brief description of the drawings
Fig. 1 is system architecture block diagram of the present invention;
In figure: the 301st, Recuperative heat exchanger inlet temperature sensor; The 302nd, Recuperative heat exchanger inlet temperature sensor; The 303rd, evaporator outlet temperature sensor; The 304th, compressor discharge pressure sensor.
Fig. 2 is controlled path working medium circulation concentration and flow regulating unit structure enlarged diagram.
More excellent working medium circulation concentration situation under the different warm area operating modes of Fig. 3 ternary mix working medium single stage compress regenerative refrigerating system.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figures 1 to 3.The invention discloses a kind of refrigeration system of single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture comprises that pipeline is successively connected and forms the compressor unit with lubricating oil separation device 1, condensate cooler unit 2, Recuperative heat exchanger unit 3, throttling unit 4 and the evaporator unit 5 in loop;
On pipeline between described condensate cooler unit 2 and Recuperative heat exchanger unit 3, be also connected with a controlled path working medium circulation concentration flow regulating unit 6;
Described Refrigeration Cycle Using Refrigerant Mixture, also comprises a control module 7, and one end of control module 7 is connected on the pipeline between compressor unit 7 and condensate cooler unit 2, and the other end is connected on the pipeline between Recuperative heat exchanger unit 3 and evaporator unit 5.
Described controlled path working medium circulation concentration flow regulating unit 6 comprises: have gas-liquid separating function fluid reservoir S, controlled major loop step-less adjustment valve V1, go out tank check valve V2; Its connected mode is: described controlled major loop step-less adjustment valve V1 entrance point connects fluid reservoir S top gaseous phase outlet, this controlled major loop step-less adjustment valve V1 port of export connects first import of a tee pipe fitting A, and second import of this tee pipe fitting is connected with the port of export that goes out tank check valve V2; The described entrance point that goes out tank check valve V2 communicates with the bottom liquid phases port of export of fluid reservoir S; The entrance point of described fluid reservoir S is connected with the high-pressure refrigerant port of export of condensate cooler unit 2 refrigerant outlet ends or Recuperative heat exchanger unit 3, and the port of export of described tee pipe fitting A is connected with the high-pressure refrigerant entrance point of Recuperative heat exchanger unit 3.
Described controlled major loop step-less adjustment valve V1 is the magnetic valve of step-less adjustment aperture or the manual adjustments valve of manual adjustments aperture.
The control method of Refrigeration Cycle Using Refrigerant Mixture working medium circulation concentration, can realize by following step
Described control module 7 receives the combination of the poor or above-mentioned arbitrary parameter of poor, the outlet temperature of evaporator unit 5, regenerator heat exchanger unit 3 inlet temperatures, Recuperative heat exchanger unit 3 outlet temperatures, Recuperative heat exchanger unit 3 out temperatures of outlet temperature, throttling unit 4 out temperatures of inlet temperature, the throttling unit 4 of compressor unit 1 pressure at expulsion, throttling unit 4;
The aperture size of parameter with the controlled major loop step-less adjustment valve V1 of instruction control controlled path working medium circulation concentration and flow regulating unit 6 controlled in described control module 7 outputs, realize the adjusting of refrigeration system working medium circulation concentration under different operating modes, concrete regulation and control method is as follows:
(1) start operating performance step: controlled major loop step-less adjustment valve V1 closes, whether control module 7 reaches setting value according to the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters, judges whether to turn to controlled cooling operating mode process;
(2) controlled cooling operating mode step:
2-1) control module 7 judges according to the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters and setting value or setting range contrast, if the worst hot case of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 in 1/4th apertures (less state), go out tank check valve V2 in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined, is specially according to input parameter (that gathers is a kind of or whole) feedback by control module 7:
A) Recuperative heat exchanger unit 3 import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, reduce the aperture of controlled major loop step-less adjustment valve V1; Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, increase the aperture of controlled major loop step-less adjustment valve V1;
B) throttling unit 4 import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit 4 imports and exports temperature difference control return difference, reduce controlled major loop step-less adjustment valve V1 aperture; Throttling unit 4 import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit 4 imports and exports temperature difference control return difference, increase controlled major loop step-less adjustment valve V1 aperture;
2-2) according to the Compressor Discharge Pressure of the outlet temperature of input parameter evaporator unit 5, condensate cooler unit 2 (or the combination of two parameters and setting value), contrast judges control module 7, if the middle temperature operating mode of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 opens, goes out tank check valve V2 in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined, is specially according to input parameter (that gathers is a kind of or whole) feedback by control module 7:
A) Recuperative heat exchanger unit 3 import and export the temperature difference be less than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture reduces; Recuperative heat exchanger unit 3 import and export the temperature difference be greater than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit 3 imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture increases;
B) throttling unit 4 import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture reduces; Throttling unit 4 import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture increases;
2-3) control module 7 is according to the evaporator outlet temperature of input parameter evaporator unit 5, the Compressor Discharge Pressure (or combination of two parameters) of condensate cooler unit 2 judges with setting value (or setting range) contrast, if the worst cold case of system in controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 opens, go out tank check valve V2 in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined according to input parameter (that gathers is a kind of or whole) feedback by control module 7, be specially:
A) Recuperative heat exchanger unit 3 import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture reduces; Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture increases;
B) throttling unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture reduces; Throttling unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve V1 aperture increases.
(3) the normal refrigeration step of refrigeration system: controlled major loop valve V1 keeps aperture.
As mentioned above, just can realize preferably the present invention.
Embodiments of the present invention are not restricted to the described embodiments; other are any does not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitute, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.

Claims (4)

1. a refrigeration system for single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture comprises that pipeline is successively connected and forms the compressor unit with lubricating oil separation device (1), condensate cooler unit (2), Recuperative heat exchanger unit (3), throttling unit (4) and the evaporator unit (5) in loop; It is characterized in that:
On pipeline between described condensate cooler unit (2) and Recuperative heat exchanger unit (3), be also connected with a controlled path working medium circulation concentration flow regulating unit (6);
Described Refrigeration Cycle Using Refrigerant Mixture, also comprise a control module (7), described control module (7) gathers compressor unit (1) pressure at expulsion, the inlet temperature of throttling unit (4), the outlet temperature of throttling unit (4), throttling unit (4) out temperature poor, the outlet temperature of evaporator unit (5), regenerator heat exchanger unit (3) inlet temperature, Recuperative heat exchanger unit (3) outlet temperature, out temperature combination poor or above-mentioned arbitrary parameter in Recuperative heat exchanger unit (3) regulates the aperture of controlled major loop step-less adjustment valve as feedback signal.
2. the refrigeration system of single valve step-less adjustment mixed working fluid circulation composition according to claim 1, is characterized in that:
Described controlled path working medium circulation concentration flow regulating unit (6) comprising: have gas-liquid separating function fluid reservoir S, controlled major loop step-less adjustment valve (V1), go out tank check valve (V2), its connected mode is: described controlled major loop step-less adjustment valve (V1) entrance point connects fluid reservoir S top gaseous phase outlet, this controlled major loop step-less adjustment valve (V1) port of export connects first import of a tee pipe fitting A, and second import of this tee pipe fitting is connected with the port of export that goes out tank check valve (V2); The described entrance point that goes out tank check valve (V2) communicates with the bottom liquid phases port of export of fluid reservoir S; The entrance point of described fluid reservoir S is connected with the high-pressure refrigerant port of export of condensate cooler unit (2) refrigerant outlet end or Recuperative heat exchanger unit (3), and the port of export of described tee pipe fitting A is connected with the high-pressure refrigerant entrance point of Recuperative heat exchanger unit (3).
3. the refrigeration system of single valve step-less adjustment mixed working fluid circulation composition according to claim 1, is characterized in that: described controlled major loop step-less adjustment valve (V1) is the magnetic valve of step-less adjustment aperture or the manual adjustments valve of manual adjustments aperture.
4. a method that regulates Refrigeration Cycle Using Refrigerant Mixture working medium circulation concentration described in claim 1 or 2 or 3, is characterized in that comprising the steps:
(1) start operating performance step: controlled major loop step-less adjustment valve (V1) cuts out, whether control module (7) reaches setting value according to the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters, judges whether to turn to controlled cooling operating mode process;
(2) controlled cooling operating mode step:
2-1) control module (7) judges according to input parameter evaporator outlet temperature, the contrast of Compressor Discharge Pressure value, if the worst hot case of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve (V1) in 1/4th apertures, go out tank check valve (V2) in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve (V1) is determined according to the feedback of input parameter by control module (7), is specially:
A) Recuperative heat exchanger unit (3) import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, reduce the aperture of controlled major loop step-less adjustment valve (V1); Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, increase the aperture of controlled major loop step-less adjustment valve (V1);
B) throttling unit (4) import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit (4) imports and exports temperature difference control return difference, reduce controlled major loop step-less adjustment valve (V1) aperture; Throttling unit (4) import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit (4) imports and exports temperature difference control return difference, increase controlled major loop step-less adjustment valve (V1) aperture;
2-2) control module (7) judges according to the Compressor Discharge Pressure contrast of the outlet temperature of input parameter evaporator unit (5), condensate cooler unit (2), if the middle temperature operating mode of Refrigeration Cycle Using Refrigerant Mixture in controlled cooling operating mode, control method is as follows: tank check valve (V2) is opened, gone out to controlled major loop step-less adjustment valve (V1) in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve (V1) is determined according to input parameter feedback by control module (7), is specially:
A) Recuperative heat exchanger unit (3) import and export the temperature difference be less than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture reduces; Recuperative heat exchanger unit (3) import and export the temperature difference be greater than this import and export temperature difference setting value maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit (3) imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture increases;
B) throttling unit (4) import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture reduces; Throttling unit (4) import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture increases;
2-3) control module (7) judges according to the Compressor Discharge Pressure of the evaporator outlet temperature of input parameter evaporator unit (5), condensate cooler unit (2) and setting value contrast, if the worst cold case of system in controlled cooling operating mode, control method is as follows: tank check valve (V2) is opened, gone out to controlled major loop step-less adjustment valve (V1) in going out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve (V1) is determined according to input parameter feedback by control module (7), is specially:
A) Recuperative heat exchanger unit (3) import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture reduces; Recuperative heat exchanger unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that Recuperative heat exchanger unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture increases;
B) throttling unit import and export the temperature difference be greater than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that throttling unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture reduces; Throttling unit import and export the temperature difference be less than one of them setting value of this import and export temperature difference maybe this import and export temperature difference setting value add that choke valve unit imports and exports temperature difference control return difference, controlled major loop step-less adjustment valve (V1) aperture increases;
(3) the normal refrigeration step of refrigeration system: controlled major loop valve (V1) keeps aperture.
CN201410167874.6A 2014-04-24 2014-04-24 The refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof Expired - Fee Related CN103954063B (en)

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