CN106642779B - A kind of high-accuracy temperature-humidity control refrigeration system and its method for laboratory - Google Patents

A kind of high-accuracy temperature-humidity control refrigeration system and its method for laboratory Download PDF

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CN106642779B
CN106642779B CN201610861851.4A CN201610861851A CN106642779B CN 106642779 B CN106642779 B CN 106642779B CN 201610861851 A CN201610861851 A CN 201610861851A CN 106642779 B CN106642779 B CN 106642779B
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refrigeration
temperature
evaporator
refrigerant
valve
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CN106642779A (en
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李舒宏
王博飞
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Southeast University
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Southeast University
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    • 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
    • F25B1/00Compression machines, plants or systems with non-reversible cycle
    • F25B1/10Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • F25B41/34Expansion valves with the valve member being actuated by electric means, e.g. by piezo-electric actuators
    • 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
    • F25B2500/00Problems to be solved
    • F25B2500/04Clogging
    • 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
    • F25B2500/00Problems to be solved
    • F25B2500/28Means for preventing liquid refrigerant entering into 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
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • 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

The present invention proposes that a kind of high-accuracy temperature-humidity for laboratory controls refrigeration system and its method, freely can cope with different actual conditions by running mode switching.The first refrigeration system is run when worst cold case, room temperature operating condition and worst hot case run the second refrigeration system, the first refrigeration system opposite operating condition switchover operation corresponding with the second refrigeration system;There is heating power expansion valve that the degree of superheat is adjusted in first refrigeration system and second system, while using the means of hot-gas bypass, increasing security of system while improving refrigerating efficiency.The wet composite demand of the visual Indoor Thermal of this refrigeration system flexibly switches, and is precisely controlled laboratory temperature humidity and carries out a variety of pilot projects, realizes that the temperature and humidity of each operating condition is precisely controlled.

Description

A kind of high-accuracy temperature-humidity control refrigeration system and its method for laboratory
Technical field
The invention patent is used for refrigeration system, controls refrigeration more particularly to a kind of high-accuracy temperature-humidity for laboratory System and method.
Background technique
With economic and science and technology continuous development, social every field competition is more fierce, and many enterprises increase grind one after another Degree of having an effect establishes laboratory to improve the competitiveness of itself.Wherein such as weaving, the experiment of biology, medicine, electronics industry The testing inspections process such as room and note detection, coating detection, packaging detection, Precision Machining, three coordinate measurements is for Interior Space Temperature degree and the precision controlling of humidity require very high.Existing Laboratory Temperature humidity control system can adjust temperature humidity Section, but there are some problems: system complex, can not realize that multiple environment to experiment interior products are tried by same experimental facilities Test project;Slowly, low efficiency, time-consuming for cooling, dehumidifying;Temperature humidity adjusting precision is not high, and fluctuation is big;Big energy-consuming, the energy Waste etc..So a kind of exploitation of novel laboratory multi-state high-accuracy temperature-humidity control system is particularly important.
Temperature humidity control system proposed by the present invention can satisfy kinds of experiments room test ambient temperature and humidity requirement, Thermocycling, change of temperature test, damp heat test can be divided into according to related national standard pilot project, wherein damp heat test divides again For steady-state damp heat test and cyclic damp heat test, pilot project temperature humidity is required and change procedure refers to national standard " GB/T 2423 " and " GB/T 11158 " etc..Wherein, thermocycling is primarily directed in electrician, electronic product and its prototype part Compatibility test when being stored in the environment of high temperature, low temperature with other materials, transport, use;High low temperature cycles test is used to Test material structure or composite material, the patient degree of institute under the continuous environment through high temperature and low temperature;Steady-state damp heat test For Aerospace Products, information electronic instrument, material, electrician, electronic product, various electronic elements in high temperature or wet Its each performance item index is examined under thermal environment;Cyclic damp heat test is for determining element, equipment or other products in high humility The adaptation for changing combination with temperature cycles and would generally using, transport and store under conditions of test specimen surface generates condensation Property.
Meanwhile this refrigeration system requires to be divided into worst cold case, room temperature operating condition and three kinds of worst hot case according to laboratory temperature, Different test temperature operating conditions correspond to different operational modes.It is -20 DEG C -10 DEG C of temperature by relevant criterion favorable low temperature operating condition, Room temperature operating condition is 10 DEG C -43 DEG C, and being higher than 43 DEG C is worst hot case.It is transported by the first refrigeration system and the switching of the second refrigeration system Common every test temperature and the humidity realized of operation of the opening and closing of valve and heater in capable, each refrigeration system, humidifier It is precisely controlled.
As described above, the invention patent provides a kind of high-accuracy temperature-humidity control system for laboratory, can complete more Kind Humidity Test.This system includes outdoor unit, indoor unit, humidifier and heater, by the first refrigeration system and the second refrigeration System is coupled by evaporator section and is formed, and different tests requirement, adaptable, safety are met by switching different operational modes Property it is high, the energy can be made full use of, it is ensured that stability, high efficiency and the accuracy of temperature and humidity adjustment.
Summary of the invention
Technical problem: for the present invention for the temperature humidity requirement of the various criterion operating condition in laboratory, proposing one kind can High-precision adjusts the multi-state refrigeration system of temperature and humidity.
Summary of the invention: in order to solve the above-mentioned technical problems, the present invention provides a kind of temperature, humidity for laboratory is more Working condition high precision refrigeration system, including the first refrigeration system and the second refrigeration system;
First refrigeration system is by the first compressor, the first condenser, the first solenoid valve SV1, low temperature heating power expansion valve And evaporator is connected in sequence;It is equipped between first compressor outlet and the evaporator for adjusting evaporation Device inner refrigerant evaporating pressure and control evaporating temperature adjust the hot-gas bypass of humidity lower than the dew-point temperature of room air; The first bypass solenoid valve SV2 and the first hot gas bypass valve are successively arranged on the hot-gas bypass;
Second refrigeration system is by the second compressor, the second condenser, second solenoid valve SV3, high temperature heating power expansion valve And evaporator is connected in sequence;It further include the first electric expansion valve and the control for controlling refrigerating capacity in second refrigeration system Second electric expansion valve of the second compressor air suction temperature;Second electromagnetism described in first electric expansion valve EXV1, the mono- end Jie It is another to be terminated between second hot gas bypass valve and the evaporator inlet before valve SV3;Second electric expansion valve The one end EXV2 is connected between the evaporator outlet and second compressor air suction mouth, and it is cold that the other end is connected to described second Between condenser and second solenoid valve SV3;Hot-gas bypass is equipped between second compressor outlet and the evaporator; The second bypass solenoid valve SV4 and the second hot gas bypass valve are successively arranged on the hot-gas bypass;
The evaporator of first refrigeration system and second refrigeration system is coupled;By switching different refrigeration The different operational modes of system realize different tests requirement.
The dried trap valve of removal refrigerant impurity is respectively provided with after first condenser and the second condenser And guarantee the liquid valve of normal feed flow.
The evaporator of first refrigeration system and second refrigeration system specially first refrigeration that is coupled is The heat exchanger tube that the heat exchanger tube that system evaporator is drawn is drawn with the second refrigeration system evaporator is arranged alternately.
The first electric expansion valve EXV1 controls evaporating temperature by adjusting evaporating pressure;Second electric expansion valve EXV2 by mixing by the second condenser refrigerant and from evaporator outlet flow out refrigerant formed hydrojet to enter press The refrigerant of contracting machine air entry is handled, and the second compressor air suction temperature is controlled.
Humidifier and heater are equipped in the evaporator side.
A kind of high-accuracy temperature-humidity control method requires to switch different operational modes according to different temperatures humidity;Specifically Are as follows:
When worst cold case, the first refrigeration system operation, gaseous refrigerant passes through the first compressor increasing temperature and pressure rear portion The throttling of condensing pressure to evaporating pressure is completed by SV1, low temperature heating power expansion valve after into the first condenser;Another part system Cryogen flows into evaporator after being mixed by hot-gas bypass with the refrigerant by low temperature heating power expansion valve by SV2 control;
When room temperature operating condition, the operation of the second refrigeration system, SV3, SV4 are opened, and gaseous refrigerant heats up by the second compressor After boosting, part of refrigerant flows through SV4 and the second hot gas bypass valve enters at evaporator;Another part refrigerant flows through Second condenser carries out degree of superheat control by high temperature heating power expansion valve again, is mixed by the refrigerant of the second hot gas bypass valve Evaporator;
When worst hot case, the operation of the second refrigeration system, SV4, EXV1, EXV2 are opened, and gaseous refrigerant is by the second compression After machine increasing temperature and pressure, part of refrigerant flows through SV4 and the second hot gas bypass valve enters at evaporator;Another part refrigeration Agent is adjusted evaporating pressure by EXV1 to mix with the refrigerant by the second hot gas bypass valve afterwards and be reached by evaporator Compressor air suction mouth;EXV2 hydrojet carries out processing control compressor air suction temperature to the refrigerant for entering compressor air suction mouth;
In the process, heater is opened according to actual needs with humidifier.
The method can also carry out a variety of Humidity Test projects;Specifically have: thermocycling, high low temperature cycles test, Steady-state damp heat test and cyclic damp heat test.
The present invention by adopting the above technical scheme, has the advantage that compared with existing refrigeration system
1, this refrigeration system can be used for the Temperature and Humidity Control in laboratory, and accuracy is high.
2, the first refrigeration system is separately run with the second refrigeration system, free switching, is suitable for various working, flexibly and real It is strong with property.
3, room temperature operating condition and worst cold case all use heating power expansion valve to control the degree of superheat, and room temperature operating condition is steamed compared to worst cold case Hair temperature is low, refrigerating capacity is small, and the degree of superheat increases with the reduction of evaporating temperature, and the applicable area of evaporating temperature becomes larger.
4, highly-safe, refrigeration system connects evaporator inlet by hot gas bypass valve, separately adds the expansion valve set, effectively Ground solves the problems such as frosting, " ice is stifled ", compressor pneumatics and liquid hammer.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of Laboratory Temperature humid control refrigeration system of the present invention;It wherein, is outdoor in dotted line frame Point;
Fig. 2 is the schematic diagram of the first refrigeration system in the present invention;
Fig. 3 is the schematic diagram of the second refrigeration system in the present invention;
Fig. 4 is the sectional view of coupling evaporation device in the present invention.
Fig. 5 is high low temperature cycles test stage schematic diagram of the invention.
Description of symbols:
First refrigeration system: the first compressor 1, the first condenser 2, the first device for drying and filtering 3, the first liquid valve 4, first Solenoid valve (SV1) 5, low temperature heating power expansion valve 6, the 7, first hot gas bypass valve 8 of the first bypass solenoid valve (SV2), the first condensating wind Machine 9;
Second refrigeration system: the second compressor 10, the second condenser 11, the second device for drying and filtering 12, the second liquid valve 13, Second electric expansion valve (EXV2) 14, the 15, second bypass solenoid valve of second solenoid valve (SV3) (SV4) 16, second hot gas bypass valve 17, high temperature heating power expansion valve 18, the 19, second condensation fan 20 of the first electric expansion valve (EXV1);Evaporator 21, heater 22, Humidifier 23, evaporator section blower 24.
In Fig. 4, arrow represents refrigerant flow direction, a, a ' it is inflow and stream of the first refrigeration system refrigerant in evaporator Out, b, b ' the second refrigeration system refrigerant is represented in the inflow and outflow of evaporator.
Specific embodiment
Feature and advantage of the invention are illustrated below in conjunction with attached drawing, it should be understood that described herein preferred Embodiment is only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As shown in Figure 1, Figure 2, Figure 3 shows, Temperature and Humidity Control refrigeration system of the invention, by the first refrigeration system and the second refrigeration System is coupled by evaporator section and is formed.First refrigeration system: dry by the first refrigeration compressor 1, the first condenser 2, first Dry filter 3, the first liquid valve 4, the first solenoid valve (SV1) 5, low temperature heating power expansion valve 6, evaporator 21 are connected in sequence, There is the first condensation fan 9 in first condenser, 2 side;And there are the first bypass solenoid valve (SV2) 7 and the first hot gas bypass valve 8 to connect Connect the outlet of the first compressor 1 and 21 import of evaporator.Second refrigeration system: the second refrigeration compressor 10, second condensation Device 11, the second device for drying and filtering 12, the second liquid valve 13, second solenoid valve (SV3) 15, high temperature heating power expansion valve 18, evaporator 21 are sequentially connected;It is another to be terminated at second before first electric expansion valve (EXV1), 19 1 end Jie second solenoid valve (SV3) 15 Between 21 entrance of hot gas bypass valve 17 and evaporator, 14 one end of the second electric expansion valve (EXV2) be connected to evaporator 21 outlet with Between second compressor, 10 air entry, the other end is connected between the second liquid valve 13 and second solenoid valve (SV3) 15.And have Two bypass solenoid valves (SV4) 16 and the second hot gas bypass valve 17 connect the outlet of the second compressor 10 and 21 import of evaporator. The evaporator 21 of first refrigeration system and the second refrigeration system is coupled, and side is equipped with heater 22, humidifier 23, evaporation Duan Fengji 24.The heat exchanger tube that the heat exchanger tube drawn from the first refrigeration system evaporator 21 and the second refrigeration system evaporator 21 are drawn It is arranged alternately and constitutes coupling evaporation section.
This refrigeration system is to be coupled to form by two separation refrigeration systems by evaporator section, the first refrigeration system and the second refrigeration System can meet respectively four standard works in high heat and humidity laboratory by switching with isolated operation also with combined operating Condition.
The present invention also provides a kind of methods of multi-state refrigeration:
First refrigeration system: a part is exported by the first compressor 1, flows through the first hot gas bypass valve 8 into evaporator 21 entrances;A part of gaseous refrigerant becomes cryogenic high pressure liquid by the processing of the first condenser 2, by the first dry filter The processing removal residual gas refrigerant of device 3, then degree of superheat control is carried out to the partially liq refrigerant with low temperature heating power expansion valve 6 System, into 21 import of evaporator;Refrigerant by low temperature heating power expansion valve 6 and the refrigerant by the first hot gas bypass valve 8 It is mixed into evaporator 21 in 21 entrance of evaporator, exchange heat with room air and humidity is adjusted, meets worst cold case Temperature and humidity requirement.The adjustable evaporator inner refrigerant evaporating pressure of hot-gas bypass, evaporating temperature is directly proportional to evaporating pressure, steams The height of hair temperature can determine the size of refrigerating capacity, adjust temperature;Evaporating temperature is lower than the dew-point temperature of room air simultaneously, Dehumidification by condensation when room air passes through 21 surface of evaporator adjusts humidity.
Second refrigeration system: after gaseous refrigerant enters 10 increasing temperature and pressure of the second compressor, the second bypass solenoid valve (SV4) 16 open, part of refrigerant flow through the second bypass solenoid valve (SV4) 16 and the second hot gas bypass valve 17 enter evaporator 21 into At mouthful.If room temperature operating condition, then second solenoid valve (SV3) 15 is opened, and the first electric expansion valve (EXV1) 19 is swollen with the second electronics Swollen valve (EXV2) 14 is closed, and another part refrigerant becomes cryogenic high pressure liquid by the processing of the second condenser 11, by second The processing removal impurity of device for drying and filtering 12, passes through thereafter the second liquid valve, guarantees the effect of normal feed flow;It is swollen with high temperature heating power again Swollen valve 18 carries out degree of superheat control to the partially liq refrigerant, into 21 entrance of evaporator;Pass through high temperature heating power expansion valve 18 refrigerant with evaporator 21, hot gas is mixed into 21 entrance of evaporator by the refrigerant of the second hot gas bypass valve 17 Adjustable evaporator inner refrigerant evaporating pressure is bypassed, evaporating temperature is directly proportional to evaporating pressure, and the height of evaporating temperature is It can determine the size of refrigerating capacity, adjust temperature;Evaporating temperature is lower than the dew-point temperature of room air simultaneously, and room air passes through steaming Dehumidification by condensation when sending out 21 surface of device adjusts humidity.If worst hot case, then second solenoid valve (SV3) 15 is closed, and the first electronics is swollen Swollen valve (EXV1) 19 and the second electric expansion valve (EXV2) 14 are opened, and another part refrigerant of the second compressor 10 outlet passes through The processing of first electric expansion valve (EXV1) 19 is adjusted evaporating pressure, control evaporating temperature, then refrigerant with pass through the The refrigerant of two hot gas bypass valves 17 is mixed into evaporator 21 and reaches 10 air entry of the second compressor again;Meanwhile second electronics 14 hydrojet of expansion valve (EXV2) handles the refrigerant for entering 10 air entry of the second compressor, and the second compressor 10 of control is inhaled Temperature degree is to prevent from damaging compressor.Under worst hot case, the first electric expansion valve (EXV1) 19 controls evaporating pressure and is Evaporating temperature, controls refrigerating capacity, and the second electric expansion valve (EXV2) 14 controls 10 suction temperature of the second compressor, temperature may be implemented The adjusting for spending humidity is such as arranged lower evaporating temperature, reduces cooling capacity and can reach a high temperature the effect of dehumidifying.
Operational mode:
This refrigeration system requires to be divided into worst cold case, room temperature operating condition and three kinds of worst hot case according to laboratory temperature.Low temperature Working temperature is -20 DEG C -10 DEG C, and room temperature operating condition is 10 DEG C -43 DEG C, and being higher than 43 DEG C is worst hot case.Different temperatures section pair Answer different system running patterns.
Such as table 1 of operational mode corresponding to each temperature range:
Table 1
1, worst cold case
Worst cold case refers to that operating temperature is -20 DEG C -10 DEG C of laboratory operating condition.The second refrigeration system compressor closes at this time It closes, the compressor starts operation of the first refrigeration system, SV1 is opened, and SV2 is opened, and low temperature heating power expansion valve is opened.Gaseous refrigerant Enter condenser from high-temperature high-pressure refrigerant a part that compressor comes out after into compressor increasing temperature and pressure, by SV1, passes through Low temperature heating power expansion valve flows into evaporator, and heating power expansion valve completes the throttling of condensing pressure to evaporating pressure at this time;Another part Refrigerant is controlled by solenoid valve SV2, is flowed through hot gas bypass valve and is mixed with the refrigerant on major trunk roads by heating power expansion valve.Hot gas By-passing valve is a kind of control method of economy of compressor refrigerating capacity, and this adjustable by-passing valve can be required discharge gas Auto bypass is to low pressure side, to maintain low evaporating pressure, simultaneously effective prevents coil pipe icing or operation cycle too short.
The operation of first refrigeration system can produce larger refrigerating capacity, and blower continues blowing cold air and enter the room to make laboratory Inside reach -20 DEG C of low temperature, heater operation at the same time is adjusted temperature accurately to meet the operating condition of temperature Demand.Being sent into interior in the air cooled has certain moisture removal, hot-gas bypass and low-temperature expansion valve regulation evaporating pressure, evaporation Temperature changes correspondingly, i.e., evaporating temperature is lower than room air dew-point temperature, Laboratory Air and its then humidity reduction of meeting, together When humidifier run, realize humidity high-precision adjust.First refrigeration system and heater, humidifier run realization low temperature simultaneously The temperature of operating condition, humidity are precisely controlled.
Low temperature heating power expansion valve is used in the first refrigeration system, refrigerating capacity is big, evaporating temperature is higher, heating power expansion valve The degree of superheat is to increase and reduce with evaporating temperature, and it is smaller that evaporating temperature changes applicable section.
2, room temperature operating condition
Room temperature operating condition refers to that operating temperature is 10 DEG C -43 DEG C of laboratory operating condition.The first refrigeration system compressor closes at this time It closes, the second refrigeration system compressor is opened, and after gaseous refrigerant enters compressor increasing temperature and pressure, the second bypass solenoid valve SV4 is opened It opens, part of refrigerant flows through the 4th solenoid valve SV4 and hot gas bypass valve enters at evaporator;Second solenoid valve SV3 is opened It opens, electric expansion valve EXV1 and EXV2 are closed, and another part refrigerant becomes cryogenic high pressure liquid by condenser processing, are passed through Device for drying and filtering processing removal impurity, then degree of superheat control is carried out to the partially liq refrigerant with high temperature expansion valve, into steaming Send out device entrance;Refrigerant by expansion valve is mixed into steaming with the refrigerant by hot gas bypass valve at evaporator Device is sent out, the adjustable evaporator inner refrigerant evaporating pressure of hot-gas bypass, evaporating temperature is directly proportional to evaporating pressure, evaporating temperature Height can determine the size of refrigerating capacity, while heater starting adjusts temperature jointly;Evaporating temperature is lower than Interior Space simultaneously The dew-point temperature of gas, dehumidification by condensation when room air passes through evaporator surface, while the common adjusting humidity of humidifier starting.
In common operating condition refrigeration system, using high temperature heating power expansion valve, evaporating temperature is lower than worst cold case, thermal expansion Valve degree of superheat adjustable range is big, and it is big that evaporating temperature is applicable in section.
3, worst hot case
Worst hot case refers to the laboratory operating condition that 43 DEG C of temperatures above require.At this point, the first refrigeration system compressor is closed, the Two refrigeration system compressors are opened, and SV4 is opened, and part of refrigerant flows through SV4 and hot gas bypass valve enters at evaporator; SV3 is closed, and electric expansion valve EXV1 and EXV2 are opened, and another part refrigerant of the second compressor outlet passes through electric expansion valve EXV1 processing, then refrigerant is mixed into evaporator with the refrigerant by hot gas bypass valve and reaches compressor air suction mouth again; Meanwhile electric expansion valve EXV2 will be by the refrigerant of the second condenser and after the refrigerant mixing that evaporator outlet flows out Hydrojet is formed, the refrigerant for entering compressor air suction mouth is handled, controls the second compressor air suction temperature to prevent to pressure Contracting machine damages;And the open degree of EXV2 is according to the second compressor air suction temperature automatic adjustment.Under worst hot case, EXV1 control Evaporating pressure, that is, evaporating temperature controls refrigerating capacity, and EXV2 controls compressor air suction temperature, the adjusting of temperature humidity may be implemented, Lower evaporating temperature is such as set, reduces cooling capacity and can reach a high temperature the effect of dehumidifying.
Humidity Test project
This system can satisfy kinds of experiments room test ambient temperature and humidity requirement, can according to related national standard pilot project To be divided into thermocycling, change of temperature test, damp heat test, wherein it is wet with alternation to be divided into steady-state damp heat test again for damp heat test Heat test.
Pilot project:
1, thermocycling
Thermocycling primarily directed in electrician, electronic product and its prototype part and other materials in high temperature, low temperature In the environment of storage, transport, use when compatibility test filtered out underproof for examining the environmental suitability of product Or the product of latent defect, improve the reliability of product.
By the harsh grade of low-temperature test known to GB/T 2423.1 " low-temperature test environment " from -65 DEG C to+5 DEG C, deviation ± 3 DEG C, test therefrom chooses -20 DEG C and is used as low-temperature test minimum temperature.From GB/T 11158 " high-temperature test chamber technical conditions " Hot test temperature range by obtained by (+20 DEG C of environment temperature -+60 DEG C of environment temperature), by standard can obtain environment temperature be 25 ± 3 DEG C, therefore worst hot case is 43 DEG C -80 DEG C desirable.
Table 2 be -20 DEG C of low temperature, at 80 DEG C of high temperature each operating condition of test running situation:
Table 2
2, high low temperature cycles test
High low temperature cycles test is used to test material structure or composite material, the institute under the continuous environment through high temperature and low temperature Patient degree is used and is testing the chemical change or physical injury that it expands with heat and contract with cold caused, and applicable object includes gold Belong to, plastics, rubber, the materials such as electronics.
As shown in figure 5, entire test is made of following components:
A → b is temperature-rise period, rises to 80 DEG C of worst hot case maximum temperature by 20 DEG C of room temperature work condition environment temperature;
B → c is high temperature constant temperature process, and test temperature is maintained at 80 DEG C;
C → d is temperature-fall period, and test temperature is reduced to -20 DEG C by 80 DEG C;
D → e is cryogenic thermostat process, and test temperature is maintained at -20 DEG C;
E → f is Recovery Process, and test temperature returns back to 20 DEG C of environment temperature;
F → g is room temperature operating condition, is maintained at 20 DEG C of environment temperature;
Such as table 3:
Table 3
3, damp heat test
A steady-state damp heat test
Sample is exposed to relative humidity by steady-state damp heat test, temperature keeps constant the examination carried out in the environment of state It tests, for Aerospace Products, information electronic instrument, material, electrician, electronic product, various electronic elements in high temperature Or its each performance item index is examined under hygrothermal environment.Test basis standard is " GB/T 2423.3 "
Constant temperature and moisture test is carried out, running situation such as table 4:
Table 4
B cyclic damp heat test
Cyclic damp heat test for determine element, equipment or other products high humility and temperature cycles variation combination and The adaptability that would generally be used, transport and store under conditions of test specimen surface generates condensation.This test is divided into stable rank Section, experimental stage, Restoration stage three parts, testing standard are " GB/T 2423.4 ".
1. the stabilization sub stage
As shown above, according to stabilization sub stage, that is, laboratory temperature known to testing standard is maintained at 25 DEG C, humidity is maintained at 60%, as state 1
2. experimental stage
First by (25 DEG C, 60%) of state 1 arrive state 2 (55 DEG C, 95%), hold mode 2 is constant, then to state 3 (25 DEG C, 95%), hold mode 3 is constant
3. Restoration stage
It tests indoor temperature and humidity and state 1 (25 DEG C, 60%) is restored to by state 3 (25 DEG C, 95%)
Table 5 is the running situation in each stage:
Table 5
The present invention is made of two sets of refrigeration systems, is switched over, is cooled down to refrigeration mode by the unlatching closure of valve It is combined with dehumidifying, meanwhile, heater can according to the actual situation be handled air condition with humidifier, various aspects joint It adjusts, can freely be controlled for testing indoor temperature and humidity, reach high-efficient, temperature humidity controls effect with high accuracy Fruit.
Above-listed detailed description is not intended to restrict the invention for embodiments of the present invention, all in essence of the invention Within mind and principle, any modification, replacement should all be within protection scopes.

Claims (7)

1. a kind of high-accuracy temperature-humidity for laboratory controls refrigeration system, which is characterized in that including the first refrigeration system and Second refrigeration system;
First refrigeration system is swollen by the first compressor (1), the first condenser (2), the first solenoid valve SV1 (5), low temperature heating power Swollen valve (6) and evaporator (21) are connected in sequence;First compressor (1) outlet and the evaporator (21) import it Between be equipped with for adjust evaporator (21) inner refrigerant evaporating pressure and control evaporating temperature be lower than room air dew-point temperature To adjust the hot-gas bypass of humidity;The heat of the first bypass solenoid valve SV2 (7) and first is successively arranged on the hot-gas bypass Gas by-passing valve (8);
Second refrigeration system is by the second compressor (10), the second condenser (11), second solenoid valve SV3 (15), Gao Wenre Power expansion valve (18) and evaporator (21) are connected in sequence;It further include control refrigerating capacity first in second refrigeration system Electric expansion valve (19) and the second electric expansion valve for controlling the second compressor (10) suction temperature;In second compressor (10) hot-gas bypass is equipped between outlet and the evaporator (21) import;The second bypass is successively arranged on the hot-gas bypass Solenoid valve SV4 (16) and the second hot gas bypass valve (17);Described in (19) the one end Jie of first electric expansion valve EXV1 It is another to be terminated between second hot gas bypass valve (17) and the evaporator (21) entrance before two solenoid valve SV3 (15); Described second electric expansion valve EXV2 (14) one end is connected to the evaporator (21) outlet and inhales with second compressor (10) Between port, the other end is connected between second condenser (11) and second solenoid valve SV3 (15);
The evaporator (21) of first refrigeration system and second refrigeration system is coupled;By switching different refrigeration The different operational modes of system realize different tests requirement.
2. high-accuracy temperature-humidity according to claim 1 controls refrigeration system, which is characterized in that in first condenser (2) and after the second condenser (11) it is connected with the dried trap valve for removing refrigerant impurity in turn and guarantees normal feed flow Liquid valve.
3. high-accuracy temperature-humidity according to claim 1 controls refrigeration system, which is characterized in that first refrigeration system With the evaporator (21) of second refrigeration system be coupled specially the first refrigeration system evaporator (21) extraction change The heat exchanger tube that heat pipe is drawn with the second refrigeration system evaporator (21) is arranged alternately.
4. high-accuracy temperature-humidity according to claim 1 controls refrigeration system, which is characterized in that first electronic expansion Valve EXV1 (19) controls evaporating temperature by adjusting evaporating pressure;The second electric expansion valve EXV2 (14) is passed through by mixing The refrigerant of second condenser (11) and from the evaporator (21) outlet outflow refrigerant formed hydrojet to enter institute The refrigerant for stating the second compressor (10) air entry is handled, and the suction temperature of second compressor (10) is controlled.
5. high-accuracy temperature-humidity according to claim 1 controls refrigeration system, which is characterized in that in the evaporator (21) Side is equipped with humidifier (23) and heater (22).
6. a kind of high-accuracy temperature-humidity control method using high-accuracy temperature-humidity described in claim 1 control refrigeration system, It is characterized in that, being required to switch different operational modes according to different temperatures humidity;Specifically:
When worst cold case, the first refrigeration system operation, gaseous refrigerant enters by the first compressor increasing temperature and pressure rear portion The throttling of condensing pressure to evaporating pressure is completed by SV1, low temperature heating power expansion valve after first condenser;Another part refrigerant Evaporator is flowed into after being mixed by hot-gas bypass with the refrigerant by low temperature heating power expansion valve by SV2 control;
When room temperature operating condition, the operation of the second refrigeration system, SV3, SV4 are opened, and gaseous refrigerant passes through the second compressor increasing temperature and pressure Afterwards, part of refrigerant flows through SV4 and the second hot gas bypass valve enters at evaporator;Another part refrigerant flows through second Condenser carries out degree of superheat control by high temperature heating power expansion valve again, is mixed into evaporation by the refrigerant of the second hot gas bypass valve Device;
When worst hot case, the operation of the second refrigeration system, SV4, EXV1, EXV2 are opened, and gaseous refrigerant passes through the second compressor liter After temperature rise pressure, part of refrigerant flows through SV4 and the second hot gas bypass valve enters at evaporator;Another part refrigerant is logical It crosses EXV1 and evaporating pressure is adjusted to mix to reach by evaporator afterwards with the refrigerant by the second hot gas bypass valve and compress Machine air entry;EXV2 hydrojet carries out processing control compressor air suction temperature to the refrigerant for entering compressor air suction mouth;
In the process, heater is opened according to actual needs with humidifier.
7. high-accuracy temperature-humidity control method according to claim 6, which is characterized in that the method can also carry out a variety of Humidity Test project;Specifically have: thermocycling, high low temperature cycles test, steady-state damp heat test and cyclic damp heat test.
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