CN109341125A - A kind of refrigeration system and control method - Google Patents

A kind of refrigeration system and control method Download PDF

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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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CN
China
Prior art keywords
evaporator
temperature
valve
temperature sensor
refrigeration system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811366692.6A
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Chinese (zh)
Other versions
CN109341125B (en
Inventor
黄玉优
毕增利
孙妍
李欣
陈桂福
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201811366692.6A priority Critical patent/CN109341125B/en
Publication of CN109341125A publication Critical patent/CN109341125A/en
Application granted granted Critical
Publication of CN109341125B publication Critical patent/CN109341125B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/027Condenser control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/11Fan speed control
    • F25B2600/111Fan speed control of condenser fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2501Bypass valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2115Temperatures of a compressor or the drive means therefor
    • F25B2700/21151Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21171Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21174Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21175Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

It includes: compressor, condenser, electric expansion valve and evaporator that the present invention, which provides a kind of refrigeration system and control method, the refrigeration system,;Cooling medium pipeline, wherein being connected with cooled medium, and cooling medium pipeline is passed through in evaporator, refrigerant and cooled medium is made to exchange heat in evaporator;Auxiliary evaporator, it is arranged in parallel at the both ends of the evaporator, and the branch where the auxiliary evaporator is refrigerant branch, and the air side of the condensation fan is arranged in, so that the hot wind of condensation fan blowout and by exchanging heat between the refrigerant in the refrigerant line in the auxiliary evaporator in the auxiliary evaporator.A part of refrigerating capacity can be bypassed away using auxiliary evaporator in parallel through the invention, so that the refrigerant into evaporator is quickly reduced, the temperature of the cooled medium after evaporator is promoted, without additional electric heater, refrigeration system stability is high.

Description

A kind of refrigeration system and control method
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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