CN109341125A - Refrigeration system and control method - Google Patents
Refrigeration system and control method Download PDFInfo
- Publication number
- CN109341125A CN109341125A CN201811366692.6A CN201811366692A CN109341125A CN 109341125 A CN109341125 A CN 109341125A CN 201811366692 A CN201811366692 A CN 201811366692A CN 109341125 A CN109341125 A CN 109341125A
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- temperature
- evaporator
- valve
- temperature sensor
- refrigeration system
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 61
- 238000009833 condensation Methods 0.000 claims abstract description 29
- 230000005494 condensation Effects 0.000 claims abstract description 29
- 239000002826 coolant Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 description 13
- 238000001816 cooling Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 230000006641 stabilisation Effects 0.000 description 7
- 238000011105 stabilization Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009790 rate-determining step (RDS) Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
-
- 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
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
-
- 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
-
- 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
- F25B2600/2501—Bypass 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention provides a refrigeration system and a control method, wherein the refrigeration system comprises: a compressor, a condenser, an electronic expansion valve and an evaporator; the cooling medium pipeline is communicated with a cooled medium and communicated with the evaporator, so that the refrigerant and the cooled medium exchange heat in the evaporator; the auxiliary evaporators are arranged at two ends of the evaporator in parallel, the branch where the auxiliary evaporators are located is a refrigerant branch, and the auxiliary evaporators are arranged on the air outlet side of the condensation fan, so that heat exchange is carried out between hot air blown out by the condensation fan and a refrigerant passing through a refrigerant pipeline in the auxiliary evaporators. According to the invention, a part of refrigerating capacity can be bypassed by using the auxiliary evaporators connected in parallel, so that the refrigerant entering the evaporators is quickly reduced, the temperature of the cooled medium passing through the evaporators is increased, an additional electric heater is not required, and the stability of the refrigerating system is high.
Description
Technical field
The invention belongs to air-conditioning technical fields, and in particular to a kind of refrigeration system and control method.
Background technique
In refrigerating and air conditioning industry, hot-gas bypass technology is many times used to defrosting or adjusting evaporating temperature；In digital whirlpool
It revolves on compressor, hot-gas bypass primarily serves load unloading effect, to reduce ability output.The steam compression type heat of the overwhelming majority
Pump/refrigeration unit does not all need the Balance Treatment that high-low pressure is specially carried out when shutting down, and mainly unit itself can pass through one
The shutdown of section time places and reaches high-low pressure balance, usually can reach high-low pressure equilibrium state in a few minutes, weight of compressor
New starting with pressure will not start.
In the water cooler or oil cooling machine group of some accurate demand for control temperature, hot-gas bypass is directly part high temperature
High-pressure refrigerant is passed through after throttling the i.e. input end of evaporator, mixes with the low-temperature low-pressure refrigerant liquid after original throttling, from
And the pressure and temperature of evaporator inlet is improved, further influence the outlet temperature of cooled liquid.This way would generally
The fluctuation of refrigeration system is caused, overlong time is stablized, the outlet temperature (namely control target) for the liquid that is correspondingly cooled
It will appear influence of fluctuations, or even sometimes might as well original control stability.
In order to solve this interactional fluctuation, some accurate units are using auxiliary electrical heater technology cooled liquid
Temperature promoted to target temperature range, accurate heating efficiency is implemented to auxiliary electrical heater by silicon-controlled equal design and is exported,
This method can fast implement target temperature and not interfere with the stability of refrigeration system.But the disadvantage is that needing to expend volume
Outer electric energy, electrically heated safety are poor, silicon-controlled more complicated to the hardware design and software control of controller.
There is fluctuation since refrigeration system in the prior art is adjusted there are the temperature of cooled medium, it is unstable, even
Cause the fluctuation of refrigeration system, stablizes overlong time, the outlet temperature (namely control target) for the liquid that is correspondingly cooled
It will appear influence of fluctuations, cooled medium can not be fast implemented and reach target temperature and do not interfere with the stabilization of refrigeration system
Property, needs to expend that additional electric energy, electrically heated safety be poor, silicon-controlled hardware design and software control to controller
The technical problems such as more complicated, therefore researching and designing of the present invention goes out a kind of refrigeration system and control method.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming refrigeration system presence in the prior art can not be real simultaneously
Existing cooled medium fast and stable reaches target temperature and does not interfere with the stability of refrigeration system, and does not need consuming volume
The defect of outer electric energy, to provide a kind of refrigeration system and control method.
The present invention provides a kind of refrigeration system comprising:
Compressor, condenser, electric expansion valve and evaporator；
Cooling medium pipeline, wherein being connected with cooled medium, and the cooling medium pipeline is passed through in the evaporator, makes
It obtains refrigerant and cooled medium exchanges heat in the evaporator；
Auxiliary evaporator is arranged in parallel at the both ends of the evaporator, and the branch where the auxiliary evaporator is system
Cryogen branch, and the air side of the condensation fan is arranged in, so that the condensation fan was blown out in the auxiliary evaporator
It exchanges heat between refrigerant in hot wind and the refrigerant line passed through in the auxiliary evaporator.
Preferably,
By-passing valve is additionally provided in the refrigerant branch.
Preferably,
The auxiliary evaporator includes air duct and the air-valve that is arranged at the tunnel inlet, and the air-valve can control institute
It states air duct and opens and closes and adjust opening size.
Preferably,
Outlet end on the cooling medium pipeline positioned at the evaporator is provided with the first temperature sensor.
Preferably,
It is additionally provided with second temperature sensor at the refrigerant inlet end of the evaporator, it is upper in the refrigerant branch
The outlet end of the auxiliary evaporator is provided with third temperature sensor；The 4th is additionally provided in the arrival end of the compressor
Temperature sensor.
Preferably,
When including the first temperature sensor, first temperature sensor is temperature sensing package；It is sensed when including second temperature
When device, third temperature sensor and four temperature sensors, the second temperature sensor and the third temperature sensor,
Four temperature sensors are temperature sensing package.
Preferably,
The auxiliary evaporator is finned tube exchanger, fin tube radiator or parallel-flow heat exchanger.
Preferably,
The cooled medium is water, so that water is passed through the cooling medium pipeline by cooled when the evaporator.
The present invention also provides a kind of control methods of refrigeration system, refrigeration system above-mentioned are used, to cooled medium
Temperature realize accurate control.
Preferably,
When including the first temperature sensor, the cooled of the evaporator is detected by first temperature sensor
The outlet temperature of medium is Ta, sets the target temperature of cooled medium as Ts；
When the refrigeration system starts, adjusts compressor frequency and/or electronic expansion valve opening and/or condensation fan turns
Speed, so that the temperature of Ta reaches Ta≤Ts+ △ t, the △ t is the first trueness error.
Preferably,
As Ts- △ t- △ t1≤Ta≤Ts+ △ t, the compressor, the electric expansion valve and the condensating wind are maintained
The current operating conditions of machine, wherein the △ t1 is the second trueness error.
Preferably,
When including by-passing valve:
As Ts-Ta > △ t, then valve area is increased, and the aperture of the bigger air-valve of difference of Ts-Ta is bigger, until
Ta reaches-△ t≤Ts-Ta≤△ t, maintains valve area at this time；
Judge whether the cooling medium outlet temperature Ta meets-△ t≤Ts-Ta≤△ t, such as meets, then maintain existing
Valve area；
As Ts-Ta <-△ t, then the by-passing valve is closed, and adjusts the compressor frequency increase, the electronics
At least one of the aperture of expansion valve increases and the revolving speed of the condensation fan increases, and increases refrigerating capacity.
Preferably,
When including third temperature sensor and four temperature sensors, detect to press by the 4th temperature sensor
Contracting machine suction temperature is Tc, detects that the outlet temperature of auxiliary evaporator is Td by the third temperature sensor；And it also wraps
When including air-valve:
And as Tc-Td > 0, then increase valve area, the increased aperture of the bigger air-valve of the value of Tc-Td is bigger；
And as Tc-Td < 0, then reduce valve area, the aperture that the smaller air-valve of the value of Tc-Td reduces is bigger.
A kind of refrigeration system and control method provided by the invention have the following beneficial effects:
1. the present invention is by setting auxiliary evaporator and makes the auxiliary evaporator in parallel with the evaporator and described
The air side of the condensation fan is arranged in, so that the hot wind and process of condensation fan blowout are described auxiliary in auxiliary evaporator
It exchanges heat between the refrigerant helped in the refrigerant line in evaporator, it can be by auxiliary evaporator to system therethrough
Cryogen carries out heat effect, and the corresponding low-temperature low-pressure refrigerant of extra refrigerating capacity is bypassed to auxiliary evaporator by parallel connection, is filled
Divide the hot wind of the fin tube condenser discharge using safety to carry out " heating " to auxiliary evaporator, realize the neutralization of extra cooling capacity,
Be conducive to the stabilization of refrigeration system, fast implement accurately temperature control target, reduces influence of the refrigeration system fluctuation to leaving water temperature,
So that the refrigerating capacity into evaporator is quickly reduced, to promote the temperature of the cooled medium after evaporator；Sufficiently benefit
" heating " is carried out to auxiliary evaporator with the hot wind that the fin tube condenser of safety discharges, realizes the neutralization of extra refrigerating capacity, by
Change in the control for not being related to refrigeration system load, therefore is conducive to the stabilization of refrigeration system, fast implements accurately water control out
Warm target reduces the fluctuation of leaving water temperature, without additional electric heater；It bypasses to neutralize without using high-pressure hot gas and steam
The refrigerating capacity of device is sent out, refrigeration system stability is high.
2. the present invention, can be according to the refrigerant in evaporator by the setting of the first temperature sensor and by-passing valve
The departure of outlet temperature and target temperature, so that passing through assisted evaporative from the hot wind part that air cooling fin pipework condensation device is produced by boasting
Device heats refrigerant, so that the temperature of cooled medium increases, until leaving water temperature reaches control target, realization refrigeration
The accurate and fast and stable of system.When by-passing valve is closed and air-valve is opened, hot wind can use accumulating in auxiliary evaporator
Low-temperature low-pressure refrigerant liquid evaporating completely, prevent refrigerant accumulation influence refrigeration system normal operation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of refrigeration system of the invention.
Appended drawing reference indicates in figure are as follows:
1, compressor；2, condenser；21, condensation fan；3, electric expansion valve；4, evaporator；5, cooling medium pipeline；6,
Auxiliary evaporator；61, air duct；7, refrigerant line；81, by-passing valve；82, air-valve；91, the first temperature sensor；92, the second temperature
Spend sensor；93, third temperature sensor；94, the 4th temperature sensor.
Specific embodiment
As shown in Figure 1, the present invention provides a kind of refrigeration system comprising:
Compressor 1, condenser 2, electric expansion valve 3 and evaporator 4 and refrigerant line 7；
Cooling medium pipeline 5, wherein being connected with cooled medium, and the cooling medium pipeline 5 is passed through the evaporator 4
In, refrigerant and cooled medium are exchanged heat in the evaporator 4；
Auxiliary evaporator 6 is arranged on refrigerant line 7, so that the auxiliary evaporator 6 is connected with the evaporator 4,
And the air side of the condensation fan 21 is arranged in, so that the hot wind that the condensation fan 21 is blown out in the auxiliary evaporator 6
It exchanges heat between the refrigerant in the refrigerant line 7 in the process auxiliary evaporator 6.
The present invention is by setting auxiliary evaporator and makes the auxiliary evaporator in parallel with the evaporator, and described auxiliary
Help evaporator that the air side of the condensation fan is set, so that the hot wind and the process auxiliary that the condensation fan is blown out
It exchanges heat between the refrigerant in refrigerant line in evaporator, it can be by auxiliary evaporator to refrigeration therethrough
Agent carries out heat effect, the corresponding low-temperature low-pressure refrigerant of extra refrigerating capacity is bypassed to auxiliary evaporator by parallel connection, sufficiently
" heating " is carried out to auxiliary evaporator using the hot wind that the fin tube condenser of safety discharges, the neutralization of extra cooling capacity is realized, has
Conducive to refrigeration system stabilization, fast implement accurately temperature control target, reduce refrigeration system and fluctuate influence to leaving water temperature, make
The refrigerating capacity obtained into evaporator is quickly reduced, to promote the temperature of the cooled medium after evaporator；It makes full use of
The hot wind of the fin tube condenser discharge of safety carries out " heating " to auxiliary evaporator, realizes the neutralization of extra refrigerating capacity, due to
It is not related to the control variation of refrigeration system load, therefore is conducive to the stabilization of refrigeration system, fast implements and be accurately discharged temperature control
Target reduces the fluctuation of leaving water temperature, without additional electric heater；It is bypassed without using high-pressure hot gas and neutralizes evaporation
The refrigerating capacity of device, refrigeration system stability are high.
Preferably,
By-passing valve 81 is additionally provided in the refrigerant branch 7.By the knot that by-passing valve is arranged on refrigeration bypass branch
Configuration formula can carry out control action to refrigerant branch, to control whether refrigerant enters refrigerant branch according to actual needs
Or enter the size of refrigerant flow in refrigerant branch, to control the big of the remaining refrigerant flow into evaporator
It is small, so that control carries out the amount of cooling refrigerating capacity to cooled medium, realize the accurate and intelligent control of medium temperature.
Conventional warm-down processing method is by adjusting electric expansion valve directly to adjust the side of the coolant quantity entered in evaporator
Method, the stabilized speed of system is very slow when reaching target temperature range.The present invention can quickly reach target temperature on this basis
Degree, but by carrying out heating treatment speed faster to the chilled water of supercooling, and can be realized fast and stable control, substitute electric add
The energy saving of the heating treatment of heat avoids the too low influence lathe of chilled water temperature, passes through the various of refrigeration unit in conventional method
Reach new stabilization process after undulated control again and need the long time, new stablizing is reached when chilled water temperature is excessively high and is controlled
System is also a prolonged stable control process, this is the shortcoming of conventional temperature control technique.
Preferably,
The auxiliary evaporator 6 includes air duct 61 and the air-valve 8 that 61 inlet of air duct is arranged in, 8 energy of air-valve
It enough controls the air duct 61 and opens and closes and adjust opening size.Condensation fan can be received by setting air duct to blow
Hot wind, and at tunnel inlet be arranged air-valve can to the wind of air duct import carry out control action, to control according to actual needs
Whether cooled medium processed is heated by thermostat, realizes intelligent control, smaller to the stability influence of refrigeration system.
Auxiliary evaporator and evaporator are in parallel relationship, and auxiliary evaporator is in condenser wind exhausting outlet side, and auxiliary is steamed
The refrigerant inlet of hair device has the size of by-passing valve control bypass amount, and the cooling capacity of auxiliary evaporator is by by air-valve control air quantity
Hot wind absorbs.Because by-passing valve is swift in motion, refrigerant bypass extra in evaporator is fallen, can be fast implemented in evaporator
Chilled water outlet temperature is precisely controlled；
When without bypass refrigerant, by-passing valve is closed, while opening air-valve and being kept for a period of time, it can be assisted evaporative
The low-temperature low-pressure refrigerant liquid evaporating completely accumulated in device prevents refrigerant accumulation from influencing the normal operation of refrigeration system；Water
When flow is too low to be caused evaporator to be easy to happen to freeze, bypass refrigeration dosage can be increased, to guarantee the safety of refrigeration system.
Preferably,
Input end on the cooling medium pipeline 5 positioned at the evaporator 4 is provided with the first temperature sensor 91.It is logical
Cross the temperature after the outlet end of evaporator the first temperature sensor of setting can enter evaporator heat exchange to cooled medium
Realize detection effect；It is compared by the refrigerant temperature (low temperature chilled water) of evaporator outlet with temperature control target, according to
Heating amount required for departure calculates, and then air-valve is accurately controlled, so that the refrigerant in evaporator is accurately heated to
Target temperature realizes the temperature control target of fast and stable.
The present invention can be gone out by the setting of the first temperature sensor and by-passing valve according to the refrigerant in evaporator
The departure of mouth temperature and target temperature, so that passing through assisted evaporative from the hot wind part that air cooling fin pipework condensation device is produced by boasting
Device heats refrigerant, to reduce into the refrigerant in evaporator, so that the temperature of cooled medium increases, until water outlet
Temperature reaches control target, realizes the accurate and fast and stable of refrigeration system.
Preferably, it is additionally provided with second temperature sensor 92 at the refrigerant inlet end of the evaporator 4, in the refrigeration
Outlet end on agent branch 7 positioned at the auxiliary evaporator 6 is provided with third temperature sensor 93；In entering for the compressor 1
Mouth end is additionally provided with the 4th temperature sensor 94.
Bypass valve opening is determined according to the deviation of leaving water temperature Ta and set temperature Ts；According to compressor air suction temperature Tc with
The deviation of auxiliary evaporator outlet temperature Td determines the aperture of air-valve, is conducive to the fast of the refrigerant exit temperature of auxiliary evaporator
Fast stability contorting, to avoid causing refrigeration system excessive influence of fluctuations
Preferably,
When including the first temperature sensor 91, first temperature sensor 91 is temperature sensing package；When including second temperature
When sensor 92, third temperature sensor 93 and four temperature sensors 94, the second temperature sensor 92, the third temperature
It spends sensor 93 and the 4th temperature sensor 94 is temperature sensing package.This is the first and second temperature sensors of the invention
Preferred constructive form.
Preferably,
The auxiliary evaporator 6 is finned tube exchanger, fin tube radiator or parallel-flow heat exchanger.This is of the invention
The preferred constructive form of auxiliary evaporator.
Preferably,
The cooled medium is water, so that water is cold when being passed through the cooling medium pipeline 5 by the evaporator 4
But.This is the preferred kind of cooled medium of the invention, can be controlled by water after reaching accurate temperature to precision component
It cools down, improves cooling effect.
Valve area is determined according to the deviation of leaving water temperature Ta and set temperature Ts, and (△ t is user's setting to Ts > Ta+ △ t
Temperature-controlled precision such as set and controls precision as ± 0.5 DEG C, then △ t=0.5, remaining is similar) and Ts-Ta it is bigger, valve area is got over
Greatly.
As shown in Figure 1, compressor, air cooling fin pipework condensation device (contain condensation fan), (this programme is swollen with electronics for restricting element
For swollen valve) and evaporator be sequentially connected with, refrigerant flow direction is identical as this sequence direction and forms basic refrigeration cycle.
Bypass point is drawn on the basis of above-mentioned basic refrigeration cycle, between the outlet and evaporator of electric expansion valve
Connecting bypass pipeline, and it is connected with by-passing valve and auxiliary evaporator in turn, the outlet of auxiliary evaporator is connected to evaporator outlet
Between compressor air suction mouth.
Auxiliary evaporator is placed in the air duct of both ends open, and air duct import is provided with the air-valve of adjustable aperture, air duct into
The air-out direction of mouth face fin tube condenser.Controlled by the overbottom pressure of condensation fan and the aperture of air-valve flowed through in air duct it is auxiliary
The hot air flow of evaporator is helped, and then influences the heat exchange amount of auxiliary evaporator.Auxiliary evaporator can be finned tube exchanger,
Fin tube radiator, parallel-flow heat exchanger etc..
According to the size of the difference of chilled water outlet temperature and set temperature in main evaporator, determine that the aperture of by-passing valve is big
It is small, so that extra low-temperature low-pressure refrigerant liquid passes through from auxiliary evaporator, guarantee the low-temp low-pressure system of main evaporator
Cryogen fluid flow is in OK range.
It is excessive to prevent from accumulating in auxiliary evaporator refrigerant liquid after closing by-passing valve, it is closed again after postponing a period of time
Air-valve is closed, hot wind can sufficiently be evaporated to the low-pressure low-temperature refrigerant liquid accumulated in auxiliary evaporator gas, guarantee refrigeration system
Refrigeration dose needed for system circulation.
It is disposed with temperature sensing package A on outlet pipe, temperature sensing package B is disposed on electric expansion valve export pipeline, compressor air suction is total
It is disposed with temperature sensing package C on pipeline, temperature sensing package D is disposed on the export pipeline of auxiliary evaporator.
The present invention also provides a kind of control methods of refrigeration system, preceding described in any item refrigeration systems are used, to quilt
The temperature of cooling medium realizes accurate control.Heat effect can be carried out to refrigerant therethrough by auxiliary evaporator,
The corresponding low-temperature low-pressure refrigerant of extra refrigerating capacity is bypassed to auxiliary evaporator by parallel connection, makes full use of safe finned tube
The hot wind of condenser discharge carries out " heating " to auxiliary evaporator, realizes the neutralization of extra cooling capacity, is conducive to the steady of refrigeration system
Determine, fast implement accurately temperature control target, reduces influence of the refrigeration system fluctuation to leaving water temperature, so that into the system of evaporator
Cooling capacity is quickly reduced, to promote the temperature of the cooled medium after evaporator；Make full use of safe fin pipework condensation
The hot wind of device discharge carries out " heating " to auxiliary evaporator, realizes the neutralization of extra refrigerating capacity, negative due to not being related to refrigeration system
The control of load changes, therefore is conducive to the stabilization of refrigeration system, fast implements accurately water outlet temperature control target, reduces leaving water temperature
Fluctuation, without additional electric heater；The refrigerating capacity for neutralizing evaporator, refrigeration system are bypassed without using high-pressure hot gas
Stability of uniting is high.
Preferably,
When including the first temperature sensor 91, the evaporator 4 is detected by first temperature sensor 91
Cooled medium outlet temperature is Ta；The target temperature of cooled medium is set as Ts；
When the refrigeration system starts, adjusts compressor frequency and/or electronic expansion valve opening and/or condensation fan turns
Speed, so that the temperature of Ta reaches Ta≤Ts+ △ t, the △ t is the first trueness error.It is preferred that (being generallyd use with most fast speed
Operating parameter under memory state carries out starting operation, there is the optimum operation combination parameter of unit under memory state).
This is the preferred control method of the starting refrigeration system of the invention according to cooling medium inlet temperature, is enabled to
By evaporator by cooled medium cooling down to the error range of target temperature Ts hereinafter, enabling to cooled Jie in this way
The temperature of matter is down to the error range of target temperature range hereinafter, in order to further heat up so that its water temperature reaches target temperature
Within the error range of degree.
Preferably,
As Ts- △ t- △ t1≤Ta≤Ts+ △ t, the compressor, the electric expansion valve and the condensating wind are maintained
The current operating conditions of machine, wherein the △ t1 is the second trueness error.This is the outlet of the invention according to cooled medium
Specific control mode when temperature is in the error range of target temperature, Ts- △ t- △ t1≤Tb≤Ts+ △ t explanation are cooled
The inlet temperature of medium has reached in the error range of target set temperature, at this moment only needs to maintain compressor, electric expansion valve
With the current state of condensation fan, it just can maintain the temperature of cooled medium in target temperature range, meet necessary requirement.It is excellent
Select △ t=0.5 DEG C, △ t1=0.5 DEG C.
Preferably,
When including by-passing valve 81:
As Ts-Ta > △ t, then valve area is increased, and the aperture of the bigger air-valve of difference of Ts-Ta is bigger, until
Ta reaches-△ t≤Ts-Ta≤△ t, maintains valve area at this time；
Judge whether the cooling medium outlet temperature Ta meets-△ t≤Ts-Ta≤△ t, such as meets, then maintain existing
Valve area；
As Ts-Ta <-△ t, then close the air-valve, and adjust the compressor frequency increase, the electronics it is swollen
At least one of the aperture of swollen valve increases and the revolving speed of the condensation fan increases, and increases refrigerating capacity.
This is the preferred control mode of the invention controlled according to cooling medium outlet temperature, i.e.-△ t≤Ts-
When Ta≤△ t illustrates that outlet temperature is in target set temperature error range, then keeps valve area constant, medium is somebody's turn to do
It continues for heating under state；Ts-Ta > △ t illustrates that medium outlet temperature is too low, needs to carry out increase system to medium at this time
The mode of heat is controlled, therefore increases the aperture of air-valve at this time, to increase the heating capacity to medium, the size of valve area
It is proportional with the size of the temperature difference (Ts-Ta), it can promote to prestissimo the temperature of medium；Ta > Ts illustrates that exit water temperature degree is inclined
Gao Liao answers the aperture appropriate for reducing air-valve, reduces medium temperature slightly to increase refrigerating capacity；Ts-Ta <-△ t explanation
Medium outlet temperature is excessively high, and the mode for needing to carry out medium stopping heating at this time then freezing controls, and closes at this time
The air-valve is closed, and adjusts the compressor frequency increase, the aperture increase of the electric expansion valve and the condensation fan
Revolving speed increase at least one of, so as to be effectively reduced the temperature of medium, to reach in target temperature range,
It satisfies the use demand.
Preferably, it when including third temperature sensor 93 and four temperature sensors 94, is passed by the 4th temperature
Sensor 94 detects that compressor air suction temperature is Tc, and the outlet of auxiliary evaporator is detected by the third temperature sensor 93
Temperature is Td；And when further including air-valve 82:
And as Tc-Td > 0, then increase valve area, the increased aperture of the bigger air-valve of the value of Tc-Td is bigger；
And as Tc-Td < 0, then reduce valve area, the aperture that the smaller air-valve of the value of Tc-Td reduces is bigger.
Both Tc and Td are closer, show that the outlet temperature of evaporator and auxiliary evaporator is closer.As Tc-Td > 0,
Illustrate that auxiliary evaporator outlet temperature is lower, it is also necessary to heat to it, then increase valve area at this time, the value of Tc-Td gets over strong wind
The increased aperture of valve is bigger；As Tc-Td < 0, illustrates that auxiliary evaporator outlet temperature is higher, the journey heated to it need to be reduced
Degree then reduces valve area, and the aperture that the smaller air-valve of the value of Tc-Td reduces is bigger, to realize auxiliary evaporator outlet temperature
Tend to be equal with compressor air suction end temperature.
Specifically, as follows to the main rate-determining steps of the valve area of auxiliary evaporator:
1) when booting operation, according to set temperature Ts, compressor frequency and/or electronic expansion valve opening and/or cold are adjusted
Solidifying rotation speed of fan, (is generallyd use the operating parameter under memory state and carries out starting operation, had under memory state with most fast speed
The optimum operation combination parameter of unit) make Ta≤Ts+ △ t (△ t be user set temperature-controlled precision, such as set control precision as
± 0.5 DEG C, then △ t=0.5, remaining is similar)；
2) as Ts- △ t-0.5≤Ta≤Ts+ △ t, the operating status of above-mentioned load is maintained, with this condition to air-valve
It is controlled；Above-mentioned " most fast speed " generallys use the operating parameter under memory state and carries out starting operation, under memory state
There is the optimum operation combination parameter of unit；
A) as Ta < Ts- △ t, according to the difference of Ts-Ta, increase the aperture of air-valve, difference is bigger, and aperture value added is got over
Greatly, until air-valve opens the output to the maximum load reduction refrigerating capacity for being then transferred to adjusting refrigeration system；
B) judge whether outlet temperature-△ t≤Ts-Ta≤△ t is true.If so, then maintaining existing valve area；
C) when whenever there is Ta > Ts+ △ t, stop the adjusting of valve area, switch to the load to refrigeration system
Be adjusted control increase refrigerating capacity output, until meet again it is above-mentioned 1).
D) both Tc and Td are closer, show that the outlet temperature of evaporator and auxiliary evaporator is closer.As Tc-Td > 0
When, then increase valve area, the increased aperture of the bigger air-valve of the value of Tc-Td is bigger；
E) as Tc-Td < 0, then reduce valve area, the aperture that the smaller air-valve of the value of Tc-Td reduces is bigger.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.With
It is only the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
Under the premise of being detached from the technology of the present invention principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as this
The protection scope of invention.
Claims (13)
1. a kind of refrigeration system, it is characterised in that: include:
Compressor (1), condenser (2), electric expansion valve (3) and evaporator (4)；
Cooling medium pipeline (5), wherein being connected with cooled medium, and the cooling medium pipeline (5) is passed through the evaporator (4)
In, refrigerant and cooled medium are exchanged heat in the evaporator (4)；
Auxiliary evaporator (6) is arranged in parallel the both ends in the evaporator (4), and the branch where the auxiliary evaporator (6)
For refrigerant branch (7), and the auxiliary evaporator (6) is arranged in the air side of the condensation fan (21), so that described
The hot wind and pass through between the refrigerant in the refrigerant branch (7) in the auxiliary evaporator (6) that condensation fan (21) is blown out
It exchanges heat.
2. refrigeration system according to claim 1, it is characterised in that:
By-passing valve (81) are additionally provided on the refrigerant branch (7).
3. refrigeration system according to claim 1 or 2, it is characterised in that:
The auxiliary evaporator (6) includes the air-valve (82) of air duct (61) and setting in the air duct (61) inlet, the wind
Valve (82) can control the air duct (61) and open and close and adjust opening size.
4. refrigeration system according to any one of claim 1-3, it is characterised in that:
Outlet end on the cooling medium pipeline (5) positioned at the evaporator (4) is provided with the first temperature sensor (91).
5. refrigeration system described in any one of -4 according to claim 1, it is characterised in that:
Second temperature sensor (92) are additionally provided at the refrigerant inlet end of the evaporator (4), in the refrigerant branch
(7) outlet end on positioned at the auxiliary evaporator (6) is provided with third temperature sensor (93)；In the compressor (1)
Arrival end is additionally provided with the 4th temperature sensor (94).
6. refrigeration system according to claim 4 or 5, it is characterised in that:
When including the first temperature sensor (91), first temperature sensor (91) is temperature sensing package；When including second temperature
When sensor (92), third temperature sensor (93) and the 4th temperature sensor (94), the second temperature sensor (92), institute
Stating third temperature sensor (93) and the 4th temperature sensor (94) is temperature sensing package.
7. refrigeration system according to claim 1 to 6, it is characterised in that:
The auxiliary evaporator (6) is finned tube exchanger, fin tube radiator or parallel-flow heat exchanger.
8. refrigeration system described in any one of -7 according to claim 1, it is characterised in that:
The cooled medium is water, so that water is cold when being passed through the cooling medium pipeline (5) by the evaporator (4)
But.
9. a kind of control method of refrigeration system, it is characterised in that: use the refrigeration system of any of claims 1-8
System realizes accurate control to the temperature of cooled medium.
10. control method according to claim 9, it is characterised in that:
When including the first temperature sensor (91), the evaporator (4) are detected by first temperature sensor (91)
Cooled medium outlet temperature be Ta；The target temperature of cooled medium is set as Ts；
When the refrigeration system starts, compressor frequency and/or electronic expansion valve opening and/or condensation fan revolving speed are adjusted, is made
The temperature for obtaining Ta reaches Ta≤Ts+ △ t, and the △ t is the first trueness error.
11. control method according to claim 10, it is characterised in that:
As Ts- △ t- △ t1≤Ta≤Ts+ △ t, the compressor, the electric expansion valve and the condensation fan are maintained
Current operating conditions, wherein the △ t1 is the second trueness error.
12. control method according to claim 10, it is characterised in that:
When including by-passing valve (81):
As Ts-Ta > △ t, then bypass valve opening is increased, and the aperture of the bigger by-passing valve of difference of Ts-Ta is bigger, until
Ta reaches-△ t≤Ts-Ta≤△ t, maintains valve area at this time；
Judge whether the cooling medium outlet temperature Ta meets-△ t≤Ts-Ta≤△ t, such as meets, then maintain existing bypass
Valve opening；
As Ts-Ta <-△ t, then the by-passing valve is closed, and adjusts the compressor frequency increase, the electronic expansion
At least one of the aperture of valve increases and the revolving speed of the condensation fan increases, and increases refrigerating capacity.
13. control method according to claim 9, it is characterised in that:
When including third temperature sensor (93) and the 4th temperature sensor (94), pass through the 4th temperature sensor (94)
It detects that compressor air suction temperature is Tc, the outlet temperature of auxiliary evaporator is detected by the third temperature sensor (93)
For Td；And when further including air-valve (82):
And as Tc-Td > 0, then increase valve area, the increased aperture of the bigger air-valve of the value of Tc-Td is bigger；
And as Tc-Td < 0, then reduce valve area, the aperture that the smaller air-valve of the value of Tc-Td reduces is bigger.
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