CN103954063B - The refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof - Google Patents

The refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof Download PDF

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CN103954063B
CN103954063B CN201410167874.6A CN201410167874A CN103954063B CN 103954063 B CN103954063 B CN 103954063B CN 201410167874 A CN201410167874 A CN 201410167874A CN 103954063 B CN103954063 B CN 103954063B
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temperature difference
import
unit
setting value
less adjustment
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CN103954063A (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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses the refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof, including compressor unit, condensate cooler unit, regenerative heat exchange cells, throttling unit and evaporator unit, input parameter is Compressor Discharge Pressure value, Recuperative heat exchanger inlet temperature, Recuperative heat exchanger Outlet Temperature value, throttling unit inlet temperature, throttling unit Outlet Temperature value, evaporator outlet temperature value, and output parameter is controlled path working medium circulation concentration and the instruction of flow regulating unit step-less adjustment valve generation corresponding actions.The requirement of corresponding Refrigeration Cycle Using Refrigerant Mixture difference operating mode and adjustment, the adjustment of this system and controlling organization are made comparisons with input parameter according to preset value, changed by the liquid level of step-less adjustment valve regulated fluid reservoir or maintain refrigeration system working medium circulation concentration so that refrigeration system all can realize efficient, stable, reliability service under different operating modes.

Description

The refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof
Technical field
The present invention relates to Engineering Thermophysics and utilization of energy ambit, particularly relate to refrigeration system and the method thereof of a kind of single valve step-less adjustment mixed working fluid circulation composition.
Background technology
In the conventional technology, adopt minimum effective cryogenic temperature that the single-stage vapor compression kind of refrigeration cycle of pure refrigerant or Local ocean tide can reach to be typically in about-40 DEG C, if to realize lower cryogenic temperature, need to adopt multi-stage compression or multistage autocascade cycle.In general, adopt the cryogenic temperature that two stages of compression can realize about-60 DEG C, adopt the cryogenic temperature that two-stage autocascade cycle can realize about-80 DEG C, but to realize cryogenic temperature-100 DEG C even lower and will take more than three grades autocascade cycle.Therefore, along with the reduction of demand temperature, refrigeration system becomes more sophisticated, and reliability reduces, and regulates difficulty and increases.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, the low temperature of-100 DEG C～-200 DEG C can be reached by single stage compress throttling refrigeration, more effective refrigeration modes can be become by the warm area traditional cascade refrigeration of replacement below-100 DEG C, and have broad application prospects.
Generally, according to existing technology, mixed work medium for throttling Refrigeration Technique can be divided into two classes: one by general cold field autocascade cycle derivative " mixed working fluid autocascade cycle ", its refrigeration unit is internal adopts parallel separating for several times, repeatedly throttling (multistage interior overlapping), and required progression is determined generally according to working fluids characteristic and required cryogenic temperature；Two realize efficient backheat from low temperature field develops " back-heating type polybasic mixture throttling kind of refrigeration cycle ".Back-heating type polybasic mixture throttling kind of refrigeration cycle is compared mixed working fluid autocascade cycle flow process and is wanted simple, it is adaptable to the refrigerating plant of miniaturization.But it is no matter the mixed work medium for throttling Refrigeration Technique of any form, if not adopting corresponding technological means to be controlled by, 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 essentially gas phase heat release in condenser, condensator outlet has certain mass dryness fraction, will not be supercool.The high pressure that system is run is not substantially affected by ambient temperature control, and is determined by working medium charging amount and system structure parameter.At the refrigeration system start-up course initial stage, whole system is in higher temperature substantially, and the most working medium that charges, also in gas phase state, therefore there will be the phenomenon that pressure at expulsion is too high；(2) after Refrigeration Cycle Using Refrigerant Mixture enters normal cooling condition, the working medium higher due to most boiling point liquefies, and now will occur that system pressure sharply declines, 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 in the process of minimum temperature by start operating performance, continuous decline due to system temperature, working medium constantly liquefies, the feature of working medium liquefaction is more first to be liquefied than lower boiling working medium by working medium high boiling in high temperature to the process of low temperature, and gas-liquid two-phase flow velocity exists the feature of velocity-slip, namely liquid phase working fluid flowing velocity will 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 due to liquid phase accumulate phenomenon existence, the working medium actual cycle concentration of refrigeration system can deviate from reality charge concentration, i.e. working medium concentration sliding.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, that is the Optimum charge of mixed working fluid and concentration are difficult to determine, determine its Optimum charge for using the refrigeration system of ternary or ternary working medium mixed above to be more difficult to and charge concentration, the system of different model all requires over substantial amounts of test and charges and draw final filling quantity and concentration, and production cost is high.On the other hand, though identical systems, under different warm area operating modes, refrigeration system needs different concentration to can be only achieved 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 drop.
For the first two defect, Chinese invention patent ZL200510042730.9 reports a kind of mixed working fluid low temperature throttle refrigeration system with changeable air reservoir, and its core concept is that the circulation industrial quality that participates in regulating system with the air reservoir controlling to be connected with high-low pressure pipeline by the break-make of electromagnetic valve controls the operating mode of high-low pressure and system.Although the method can control high-low pressure in rational scope, but owing to the turnover of the gas of air reservoir causes the working medium concentration of actual participation kind of refrigeration cycle that uncontrollable change occurs, refrigeration system refrigeration performance degradation can be caused；
Chinese invention patent ZL201110061458.4 reports a kind of low-temperature mixed-refrigerants throttle refrigeration system ability, regulating working conditions and control method.Its core concept is to enter controlled path stable can and prevent the Compressor Discharge Pressure of start operating mode too high by controlling gases at high pressure, and regulates low pressure by controlling the gas turnover of controlled path stable can so that low pressure is unlikely to too low under worst cold case；In addition this controlled path stable can is when start operating performance and fast cooling operating mode, bypass to reduce the circulating mass of refrigerant of refrigeration system by pipeline, when normal cooling condition, the cold-producing medium of controlled path stable can both participates in kind of refrigeration cycle to strengthen the flow of refrigeration system, make power maintain higher level, namely can realize the adjustment of refrigerant system capacity and operating mode by controlling the turnover of this controlled path stable can cold-producing medium.Shortcoming is to switch the working medium circulation concentration of refrigeration system when whether air accumulator gas participates in circulation and regulate high-low pressure certain change all can occur, this can allow system under specific operating mode due to working medium circulation deviation of concentration optimum circulation composition, cause that efficiency declines, particularly in fast cooling process, when 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 can be only achieved preferably circulation composition.
For the 3rd shortcoming, both at home and abroad it is not yet reported that relevant measure goes to overcome.
Actually, according to the requirement for optimum working medium circulation concentration of the different warm area operating mode refrigeration systems, if the working medium circulation concentration of worst hot case can be regulated by control device lay particular stress on, working medium circulation concentration so can be allowed closer to optimal concentration, improve efficiency, increase refrigerating capacity so that the temperature fall time of high-temperature region shortens further；As a same reason, in the process of fast cooling, time temperature drops to middle warm area operating mode, the optimum working medium circulation concentration of system is no longer the concentration of high-temperature region operating mode, it requires that in working medium circulation concentration now, the decline of heavy constituent ratio just can so that regenerator heat exchange Curve Matching obtains better, therefore, now it is also required to be regulated by control device the working medium circulation concentration of refrigeration system according to operating mode so that working medium circulation concentration is more suitable for the operating mode of this warm area.So guaranteeing that the efficiency of system is higher by the suitable concentration of adjustment, in general, after adjustment concentration, the changed power of system is little, but efficiency can improve；And do not do concentration adjustment, being only to increase flow goes to increase power probably due to concentration there occurs change, and refrigerating efficiency cannot improve, it is clear that this way effect compared with adjusting concentration is bad and does not have energy saving.Therefore, in the fast cooling stage, it is possible to by adjusting working medium circulation concentration closer to optimum concentration to greatly speed up the cooling rate of different warm area, whole temperature fall time will be greatly shortened.
So, it is no matter so that refrigeration system cooling is gone down, is also so that refrigeration system can operate in preferably under working medium circulation concentration at each warm area, take certain technological means to be controlled the working medium circulation concentration of system necessary.
Summary of the invention
It is an object of the invention to overcome the shortcoming and defect of above-mentioned prior art, it is provided that the refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition and method thereof, it is achieved refrigeration system fast cooling, keep the effect of greater efficiency stable operation.
The present invention is achieved through the following technical solutions:
A kind of refrigeration system of single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture include pipeline successively be connected and formed loop with the compressor unit of lubricating oil separation device, condensate cooler unit, regenerative heat exchange cells, throttling unit and evaporator unit；
On pipeline between described condensate cooler unit and regenerative heat exchange cells, it is also associated with a controlled path working medium circulation concentration flux regulon；
Described Refrigeration Cycle Using Refrigerant Mixture, also include a control unit, described control unit 7 collect and process machine unit 1 pressure at expulsion, the inlet temperature of throttling unit 4, the outlet temperature of throttling unit 4, the difference of throttling unit 4 out temperature, the outlet temperature of evaporator unit 5, regenerator heat exchanger unit 3 inlet temperature, regenerative heat exchange cells 3 outlet temperature, the poor or above-mentioned arbitrary parameter of regenerative heat exchange cells 3 out temperature combination regulate the aperture of controlled major loop step-less adjustment valve as feedback signal；
Described controlled path working medium circulation concentration flux regulon includes: has the fluid reservoir S of gas-liquid separating function, 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 the outlet of fluid reservoir S top gas phase, 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 going out tank check valve；The described entrance point going 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 the condensate cooler unit style cryogen port of export or regenerative heat exchange cells, and the port of export of described tee pipe fitting A is connected with the high pressure refrigerant inlet end of regenerative heat exchange cells.
Described controlled major loop step-less adjustment valve is the manual adjustments valve of the electromagnetic valve of step-less adjustment aperture or 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, control unit is according to whether the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters reaches setting value, it may be judged whether turn to controlled cooling operating mode process；
(2) controlled cooling operating mode step:
2-1) control unit judges according to input parameter evaporator outlet temperature, the contrast of Compressor Discharge Pressure value, if Refrigeration Cycle Using Refrigerant Mixture is in the worst hot case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve is in 1/4th apertures, go out tank check valve is in 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 unit, particularly as follows:
A) regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, reduces the aperture of controlled major loop step-less adjustment valve；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, increases the aperture of controlled major loop step-less adjustment valve；
B) throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, reduces controlled major loop step-less adjustment valve opening；Throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, increases controlled major loop step-less adjustment valve opening；
2-2) control unit judges according to the Compressor Discharge Pressure contrast of the input outlet temperature of parameter evaporator unit, condensate cooler unit, if Refrigeration Cycle Using Refrigerant Mixture is in the middle temperature operating mode of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve opens, go out tank check valve is in out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve is determined according to input parameter feedback by control unit, particularly as follows:
A) regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve opening reduces；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve opening increases；
B) throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and controlled major loop step-less adjustment valve opening reduces；Throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve opening increases；
2-3) control unit judges with setting value contrast according to the Compressor Discharge Pressure of the input evaporator outlet temperature of parameter evaporator unit, condensate cooler unit, if system is in the worst cold case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve opens, go out tank check valve is in out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve is determined according to input parameter feedback by control unit, particularly as follows:
A) regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve opening reduces；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve opening increases；
B) throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve opening reduces；Throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and 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, relative to prior art, has such advantages as and effect:
The present invention adopts control unit output to control the aperture size that parameter controls the controlled major loop step-less adjustment valve of controlled path working medium circulation concentration and flow regulating unit with instruction, realize the adjustment of refrigeration system working medium circulation concentration under different operating mode, the shortcoming overcoming current Refrigeration Cycle Using Refrigerant Mixture, has saved energy consumption.
Technical measure is simple and easy to do, it is achieved Refrigeration Cycle Using Refrigerant Mixture fast cooling, keeps greater efficiency stable operation.
Accompanying drawing explanation
Fig. 1 is present system structure block diagram；
In figure: 301 is Recuperative heat exchanger inlet temperature sensor；302 is Recuperative heat exchanger inlet temperature sensor；303 is evaporator outlet temperature sensor；304 is 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 levels under Fig. 3 ternary mix working medium single stage compress regenerative refrigerating system difference warm area operating mode.
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 the refrigeration system of a kind of single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture includes pipeline successively and is connected and forms the compressor unit 1 with lubricating oil separation device in loop, condensate cooler unit 2, regenerative heat exchange cells 3, throttling unit 4 and evaporator unit 5；
On pipeline between described condensate cooler unit 2 and regenerative heat exchange cells 3, it is also associated with a controlled path working medium circulation concentration flux regulon 6；
Described Refrigeration Cycle Using Refrigerant Mixture, also includes a control unit 7, and one end of control unit 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 regenerative heat exchange cells 3 and evaporator unit 5.
Described controlled path working medium circulation concentration flux regulon 6 includes: has the fluid reservoir S of gas-liquid separating function, 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 the outlet of fluid reservoir S top gas phase, 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 going out tank check valve V2；The bottom liquid phases port of export of the described entrance point and fluid reservoir S that go out tank check valve V2 communicates；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 regenerative heat exchange cells 3, and the port of export of described tee pipe fitting A is connected with the high pressure refrigerant inlet end of regenerative heat exchange cells 3.
Described controlled major loop step-less adjustment valve V1 is the manual adjustments valve of the electromagnetic valve of step-less adjustment aperture or manual adjustments aperture.
The control method of Refrigeration Cycle Using Refrigerant Mixture working medium circulation concentration, can be realized by following step
Described control unit 7 receives the combination of compressor unit 1 pressure at expulsion, the inlet temperature of throttling unit 4, the outlet temperature of throttling unit 4, the difference of throttling unit 4 out temperature, the outlet temperature of evaporator unit 5, regenerator heat exchanger unit 3 inlet temperature, regenerative heat exchange cells 3 outlet temperature, the poor or above-mentioned arbitrary parameter of regenerative heat exchange cells 3 out temperature；
The output of described control unit 7 controls the aperture size that parameter controls the controlled major loop step-less adjustment valve V1 of controlled path working medium circulation concentration and flow regulating unit 6 with instruction, realizing the adjustment of refrigeration system working medium circulation concentration under different operating mode, concrete adjustment and control method are as follows:
(1) start operating performance step: controlled major loop step-less adjustment valve V1 closes, control unit 7 is according to whether the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters reaches setting value, it may be judged whether turn to controlled cooling operating mode process；
(2) controlled cooling operating mode step:
2-1) control unit 7 judges with setting value or set point contrast according to the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters, if Refrigeration Cycle Using Refrigerant Mixture is in the worst hot case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 is in 1/4th apertures (less state), go out tank check valve V2 is in out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined according to input parameter (one or whole collected) feedback by control unit 7, particularly as follows:
A) regenerative heat exchange cells 3 is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, reduces the aperture of controlled major loop step-less adjustment valve V1；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, increases the aperture of controlled major loop step-less adjustment valve V1；
B) throttling unit 4 is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit 4, reduces controlled major loop step-less adjustment valve V1 aperture；Throttling unit 4 is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit 4, increases controlled major loop step-less adjustment valve V1 aperture；
2-2) control unit 7 judges according to Compressor Discharge Pressure (or the combination of two parameters and the setting value) contrast of the input outlet temperature of parameter evaporator unit 5, condensate cooler unit 2, if Refrigeration Cycle Using Refrigerant Mixture is in the middle temperature operating mode of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 opens, go out tank check valve V2 is in out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined according to input parameter (one or whole collected) feedback by control unit 7, particularly as follows:
A) regenerative heat exchange cells 3 is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve V1 aperture reduces；Regenerative heat exchange cells 3 is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells 3, and controlled major loop step-less adjustment valve V1 aperture increases；
B) throttling unit 4 is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and controlled major loop step-less adjustment valve V1 aperture reduces；Throttling unit 4 is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve V1 aperture increases；
2-3) the control unit 7 evaporator outlet temperature according to input parameter evaporator unit 5, the Compressor Discharge Pressure (or combination of two parameters) of condensate cooler unit 2 judges with setting value (or set point) contrast, if system is in the worst cold case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve V1 opens, go out tank check valve V2 and be in out liquid status, the concrete aperture state of controlled major loop step-less adjustment valve V1 is determined according to input parameter (one or whole collected) feedback by control unit 7, particularly as follows:
A) regenerative heat exchange cells 3 is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve V1 aperture reduces；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve V1 aperture increases；
B) throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve V1 aperture reduces；Throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and 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 it has been described above, the present invention just can be realized preferably.
Embodiments of the present invention are also not restricted to the described embodiments; the change made under other any spirit without departing from the present invention and principle, modification, replacement, combination, simplification; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (3)

1. a refrigeration system for single valve step-less adjustment mixed working fluid circulation composition, this Refrigeration Cycle Using Refrigerant Mixture includes pipeline successively and is connected and forms the compressor unit (1) with lubricating oil separation device in loop, condensate cooler unit (2), regenerative heat exchange cells (3), throttling unit (4) and evaporator unit (5)；It is characterized in that:
On pipeline between described condensate cooler unit (2) and regenerative heat exchange cells (3), it is also associated with controlled path working medium circulation concentration flux regulon (6)；
Described Refrigeration Cycle Using Refrigerant Mixture, also include a control unit (7), described control unit (7) collect and process machine unit (1) pressure at expulsion, the inlet temperature of throttling unit (4), the outlet temperature of throttling unit (4), the difference of throttling unit (4) out temperature, the outlet temperature of evaporator unit (5), regenerator heat exchanger unit (3) inlet temperature, regenerative heat exchange cells (3) outlet temperature, the combination in any of regenerative heat exchange cells (3) out temperature difference or above-mentioned parameter regulates the aperture of controlled major loop step-less adjustment valve (V1) as feedback signal；
Described controlled path working medium circulation concentration flux regulon (6) including: has the fluid reservoir S of gas-liquid separating function, 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 the outlet of fluid reservoir S top gas phase, 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 going out tank check valve (V2)；The bottom liquid phases port of export of the described entrance point and fluid reservoir S that go out tank check valve (V2) communicates；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 regenerative heat exchange cells (3), and the port of export of described tee pipe fitting A is connected with the high pressure refrigerant inlet end of regenerative heat exchange cells (3).
2. the refrigeration system of single valve step-less adjustment mixed working fluid circulation composition according to claim 1, it is characterised in that: electromagnetic valve that described controlled major loop step-less adjustment valve (V1) is step-less adjustment aperture or the manual adjustments valve of manual adjustments aperture.
3. the mixed working fluid circulation composition control method of refrigeration system described in a claim 1 or 2, it is characterised in that comprise the steps:
(1) start operating performance step: controlled major loop step-less adjustment valve (V1) is closed, control unit (7) is according to whether the combination of input parameter evaporator outlet temperature, Compressor Discharge Pressure or two parameters reaches setting value, it may be judged whether turn to controlled cooling operating mode process；
(2) controlled cooling operating mode step:
2-1) control unit (7) judges according to input parameter evaporator outlet temperature, the contrast of Compressor Discharge Pressure value, if Refrigeration Cycle Using Refrigerant Mixture is in the worst hot case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve (V1) is in 1/4th apertures, go out tank check valve (V2) is in 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 unit (7), particularly as follows:
A) regenerative heat exchange cells (3) is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, reduces the aperture of controlled major loop step-less adjustment valve (V1)；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, increases the aperture of controlled major loop step-less adjustment valve (V1)；
B) throttling unit (4) is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit (4), reduces controlled major loop step-less adjustment valve (V1) aperture；Throttling unit (4) is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit (4), increases controlled major loop step-less adjustment valve (V1) aperture；
2-2) control unit (7) judges according to the Compressor Discharge Pressure contrast of the outlet temperature of input parameter evaporator unit (5), condensate cooler unit (2), if Refrigeration Cycle Using Refrigerant Mixture is in the middle temperature operating mode of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve (V1) opens, go out tank check valve (V2) is in 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 unit (7), particularly as follows:
A) regenerative heat exchange cells (3) is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve (V1) aperture reduces；Regenerative heat exchange cells (3) is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this import and export temperature difference setting value maybe this import and export temperature difference setting value plus regenerative heat exchange cells (3), and controlled major loop step-less adjustment valve (V1) aperture increases；
B) throttling unit (4) is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and controlled major loop step-less adjustment valve (V1) aperture reduces；Throttling unit (4) is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve (V1) aperture increases；
2-3) control unit (7) judges with setting value contrast according to the Compressor Discharge Pressure of the evaporator outlet temperature of input parameter evaporator unit (5), condensate cooler unit (2), if system is in the worst cold case of controlled cooling operating mode, control method is as follows: controlled major loop step-less adjustment valve (V1) opens, go out tank check valve (V2) is in 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 unit (7), particularly as follows:
A) regenerative heat exchange cells (3) is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve (V1) aperture reduces；Regenerative heat exchange cells is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus regenerative heat exchange cells, and controlled major loop step-less adjustment valve (V1) aperture increases；
B) throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference more than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus throttling unit, and controlled major loop step-less adjustment valve (V1) aperture reduces；Throttling unit is imported and exported the temperature difference and is imported and exported temperature difference control return difference less than this one of them setting value of import and export temperature difference maybe this import and export temperature difference setting value plus choke valve unit, and controlled major loop step-less adjustment valve (V1) aperture increases；
(3) the normal refrigeration step of refrigeration system: controlled major loop step-less adjustment valve (V1) keeps aperture.
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