Summary of the invention
According to an aspect of the invention, there is provided a kind of scientific experiment cupboards high-precision twin-stage temperature-controlling system, feature existIn including:
Intermediate Heat Exchanger, the Intermediate Heat Exchanger are placed in except experiment cabinet；
The secondary liquid circulatory system comprising circulating pump, cold end triple valve, semiconductor heat pump assembly, hot end triple valve, sideRoad solenoid valve, shut-off valve, cooling network, and be placed within experiment cabinet,
Wherein:
The cooling network includes multiple cooling branches in parallel, and each cooling branch includes cold plate, the adjusting of branch electromagnetismValve, temperature sensor and flowmeter,
The water supply pipe and water return pipeline of the cooling network carry out heat exchange by the semiconductor heat pump assembly；
Bypass branch is equipped between the semiconductor heat pump assembly and circulating pump；
The cold end triple valve connects the water supply pipe, the cold end of semiconductor heat pump assembly and a cold end bypass；
The hot end triple valve connects the water return pipeline, the hot end of semiconductor heat pump assembly and a hot end bypass；
Spacecraft thermal control bus outside the secondary liquid circulatory system and experiment cabinet carries out heat by Intermediate Heat ExchangerAmount exchange,
The bypass branch is equipped with a bypass solenoid valve and differential pressure pickup.
A further aspect according to the present invention is provided based on above-mentioned scientific experiment cupboards high-precision twin-stage temperature controlThe scientific experiment cupboards high-precision twin-stage temperature control method of system.
Specific embodiment
The purpose of the present invention is being directed in space science experiment cabinet Design of Temperature Control, the cooling Temperature of Working of experiment cabinet entranceThe problem of fluctuation or temperature drift, propose a kind of scientific experiment cupboards high-precision twin-stage temperature-controlling system side based on thermoelectric heat pumpCase avoids the cooling Temperature of Working of entrance so that the cooling Temperature of Working of experiment cabinet entrance can be adjusted independently of spacecraft thermal control systemFluctuation or temperature drift improve the temperature controlled validity of experiment cabinet and accuracy to the temperature controlled influence of experiment cabinet.
Technical scheme is as follows:
A kind of scientific experiment cupboards high-precision twin-stage temperature-controlling system based on thermoelectric heat pump contains Intermediate Heat Exchanger, circulationPump, semiconductor heat pump assembly, several cold plates, triple valve, solenoid valve, shut-off valve, differential pressure pickup, temperature sensor and streamMeter；The circulating pump, semiconductor heat pump assembly, triple valve, solenoid valve, cold plate, shut-off valve, differential pressure pickup, temperatureSensor and flowmeter form secondary liquid recirculating network, it is characterised in that: the secondary liquid recirculating network and external space flightDevice heat control system carries out heat exchange by Intermediate Heat Exchanger；The semiconductor heat pump assembly is by the heat based on P-N junction thermocoupleElectric refrigerator and internally finned tube composition；There is the bypass branch with solenoid valve between the circulating pump, semiconductor heat pump assemblyRoad；The multiple cooling branch has a cold plate and an electromagnetism tune using the cooling network of structure composition in parallel, each cooling branchSave valve.The water supply of the cooling network in parallel and water return pipeline are exchanged by the thermoelectric heat pump component rows heat；It is described coldHold triple valve connection water supply pipe, semiconductor heat pump assembly cold end and cold end bypass；The hot end triple valve connection water return pipeline,Semiconductor heat pump assembly hot end and hot end bypass.
Preferably, the internally finned tube uses the waveform internally finned tube with inner core, to improve heat transfer efficiency.
The scientific experiment cupboards high-precision twin-stage temperature-controlling system based on thermoelectric heat pump is by four control objects to beingSystem is regulated and controled, and holding circulating pump first is run under constant rotational speed, makes cooling net in parallel by adjusting bypass branch solenoid valveThe pressure difference that network supplies water between water return pipeline is setting value, on the other hand controls bosher's mass flow by regulating three-way valve and is partly ledBody heat pump assembly cold end/cold end bypass, hot end/hot end bypass path and flow, and the function by adjusting thermoelectric heat pumpRate, which is adjusted from the refrigerating capacity that cold end is pumped to hot end, makes cooling Web portal temperature setting value in parallel, each cold finally by adjustingBut the flow that the electromagnetism valve regulation of branch flows through respective branch makes cold plate import and export working medium temperature difference setting value.
At least there are three types of operating modes for the scientific experiment cupboards high-precision twin-stage temperature-controlling system based on thermoelectric heat pump: falseIf cooling working medium temperature range needed for scientific experiment cupboards is Tc-min~Tc-max, 1. as entrance Temperature of Working T1601>Tc-max, respectivelyRegulating three-way valve, which makes to supply water, fully enters thermoelectric heat pump cold end pipeline, and return water fully enters thermoelectric heat pump hot end pipeline, adjustsThe power of thermoelectric cooler makes T in section semiconductor heat pump assembly1602∈[Tc-min,Tc-max]；2. working as T1601<Tc-min, adjust respectivelyTriple valve, which makes to supply water, fully enters thermoelectric heat pump cold end pipeline, and return water part enters thermoelectric heat pump hot end pipeline, thermoelectricity systemCooler does not work, and makes T1602∈[Tc-min,Tc-max], semiconductor heat pump assembly is equivalent to a Recuperative heat exchanger at this time, preventsLow chilled liquid temperature makes to condense in experiment cabinet；3. working as T1601∈[Tc-min,Tc-max], regulating three-way valve makes to supply water respectivelyCold end bypass is fully entered, return water fully enters hot end bypass, and thermoelectric cooler does not work.
Compared with prior art, the invention has the advantages and beneficial effects that: 1. by semiconductor heat pump assembly realize to realityThe adjustment for testing the cooling Temperature of Working of cabinet entrance, avoids the fluctuation of spacecraft thermal control system temperature of incoming flow to experiment cabinet accurate temperature controllingInfluence, meet the demand for control of lower temperature under the conditions of higher temperature of incoming flow, while lower temperature of incoming flow condition being avoided to issueThe solidifying situation of raw food；2. keep circulating pump to work with constant rotational speed, it is stable in parallel cold by adjusting bypass branch solenoid valveBut the pressure difference of network water supply and water return pipeline is conducive to keep cooling bypass flow and solenoid valve valve opening approximation lineProperty, the stability that enhancing bypass flow is adjusted, while advantageously reducing the loss of pump；3. the design of bypass branch structure is conducive toFlow is distributed according to radiating requirements, to reduce the energy consumption of semiconductor heat pump assembly；4. semiconductor heat pump assembly uses band inner coreWaveform internally finned tube, enhance the heat exchange of hot and cold side.
As shown in figure 3, the signal of differential pressure pickup 15 inputs bypass branch valve positioner 20, output signal control bypassThe bypass solenoid valve 13 of branch road；The signal of temperature sensor 1601 and 1602 inputs threeway valve control 23 and heat simultaneouslyElectric refrigerator controller 21, output signal control the thermoelectric cooler in triple valve 5 and 11 and semiconductor heat pump assembly 6 respectively603；The signal of temperature sensor 1602 and 1603 inputs cooling branch road valve controller 22, and output signal controls cooling branch roadBranch solenoid valve 10.Bypass branch valve positioner 20, thermoelectric cooler controller 21, cooling branch road valve controller22 and threeway valve control 23 be integrated in FPGA controller 24.
Fig. 4 is showing a kind of scientific experiment cupboards high-precision twin-stage temperature control system based on thermoelectric heat pump according to the present inventionThree kinds of operating modes of system.It is assumed that cooling Web portal Temperature of Working needed for scientific experiment cupboards is Tc-min~Tc-max, for temperature of incoming flow T before thermoelectric heat pump1601Three kinds of situations, can by change operating mode make parallel connection cool down netTemperature T before network entrance1602∈[Tc-min,Tc-max].Fig. 4 will be hereinafter described further.
Specific structure of the invention, principle and embodiment are further illustrated with reference to the accompanying drawing.
Fig. 1 is a kind of scientific experiment cupboards high-precision twin-stage based on thermoelectric heat pump according to an embodiment of the inventionThe principle schematic diagram of temperature-controlling system, which includes Intermediate Heat Exchanger 1, second level liquidBody circulation network 2, circulating pump 3, bypass branch 4, cold end triple valve 5, semiconductor heat pump assembly 6, cold end bypass 7, cooling branch8, cold plate 9, branch solenoid valve 10, hot end triple valve 11, hot end bypass 12, bypass solenoid valve 13, shut-off valve 14, pressureGap sensor 15, temperature sensor 16, flowmeter 17.Including circulating pump 3, bypass branch 4, cold end triple valve 5, thermoelectric heat pumpComponent 6, cold plate 9, branch solenoid valve 10, hot end triple valve 11, bypass solenoid valve 13, shut-off valve 14, pressure difference sensingDevice 15, temperature sensor 16, flowmeter 17 the level two circulatory system 2 be built in experiment cabinet 18.Each cooling branch 8 wrapsCold plate 9, branch solenoid valve 10, temperature sensor 16 and flowmeter 17 are included, and forms cooling network in parallel.AndThe water supply of the cooling network of connection and water return pipeline pass through the semiconductor heat pump assembly 6 progress heat exchange；It circulating pump 3 and partly leadsThere is bypass branch 4 between body heat pump assembly 6；The cold end triple valve 5 connects water supply pipe, semiconductor heat pump assembly cold end 601With cold end bypass 7；The hot end triple valve connection water return pipeline, semiconductor heat pump assembly hot end 602 and hot end bypass 12；Second levelFluid circulation system 2 carries out heat with spacecraft thermal control bus 19 outside experiment cabinet by Intermediate Heat Exchanger 1 and exchanges.
The semiconductor heat pump assembly 6 include thermoelectric refrigeration component 603 based on P-N junction thermocouple, be arranged symmetrically it is coldHold internally finned tube 601 and hot end internally finned tube 602.To improve heat transfer efficiency, using the waveform internally finned tube with inner core.
The working principle of the invention and implementation process are as follows: circulating pump (3) drives liquid with the rotary speed working of approximately constantThe circulation in secondary liquid circulation loop (2).Differential pressure pickup (15) acquisition pressure difference signal passes to the control of bypass branch valveDevice (20), the bypass solenoid valve (13) on bypass branch (4) issue the aperture of Signal Regulation valve, control in parallel coolingNetwork supplies water and the pressure difference of water return pipeline is definite value.Temperature sensor (1601) acquires temperature before water supply pipe semiconductor heat pump assemblyDegree, temperature sensor (1602) acquire cooling Web portal temperature i.e. in parallel after water supply pipe semiconductor heat pump assembly.Assuming that sectionLearning cooling working medium temperature range needed for experiment cabinet is Tc-min~Tc-max, the temperature T before water supply pipe semiconductor heat pump assembly1601>Tc-maxWhen, adjusting cold end triple valve (5) and hot end triple valve (11) respectively makes water supply fully enter thermoelectric heat pump cold end pipeline(601), return water fully enters thermoelectric heat pump hot end pipeline (602), and thermoelectric cooler controller (21) issues signal control halfHeat is pumped from cold end to hot end, makes T by the power of thermoelectric cooler (603) in conductor heat pump components (6)1602∈[Tc-min,Tc-max]；Work as T1601<Tc-min, adjusting cold end triple valve (5) makes water supply fully enter semiconductor heat pump assembly cold end pipeline (601),Adjust the amount that hot end triple valve (11) control return water enters semiconductor heat pump assembly end tube road (602), thermoelectric cooler (603)It does not work, makes T1602∈[Tc-min,Tc-max], semiconductor heat pump assembly is equivalent to a Recuperative heat exchanger at this time, prevents because of coolingIt is condensed in the too low experiment cabinet of coolant-temperature gage.The aperture of cold end triple valve (5) and hot end triple valve (11) is controlled by triple valveDevice (23) automatic adjustment；Work as T1601∈[Tc-min,Tc-max], adjusting cold end triple valve (5) and hot end triple valve (11) respectively makes to supplyWater fully enters cold end bypass (7), and return water fully enters hot end bypass (12), and thermoelectric cooler (603) does not work at this time.Such as figureShown in 4, for temperature of incoming flow T before thermoelectric heat pump1601Three kinds of situations, pass through cold end triple valve (5), hot end triple valve (11)Regulation with thermoelectric cooler (603) can guarantee the Temperature of Working T into cooling network1602∈[Tc-min,Tc-max].Temperature passesSensor 1603 acquires cooling branch cold plate and exports Temperature of Working.For each cooling branch (8), pass through cooling branch road valve controlThe flow that the big minor adjustment of device (22) controlling brancher solenoid valve (10) aperture passes through keeps cold plate out temperature T1602、T1603Difference be definite value, to reach the temperature control demand of each branch part.Above-mentioned bypass branch valve positioner (20), thermoelectricity systemCooler controller (21), cooling branch road valve controller (22) and threeway valve control (23) are integrated in the FPGA in experiment cabinetIn controller (24).Last each branch liquid summarizes by Intermediate Heat Exchanger (1) space flight passed to waste heat outside experiment cabinetDevice thermal control bus (19), circulation fluid temperature reduction, into next circulation.
The present invention is realized by semiconductor heat pump assembly to the adjustment of the cooling Temperature of Working of experiment cabinet entrance, and space flight is avoidedInfluence of the fluctuation of device heat control system temperature of incoming flow to experiment cabinet temperature control, while can satisfy lower in the case of higher temperature of incoming flowThe demand for control of temperature, and avoid condensing in cabinet in the case of lower temperature of incoming flow, improve having for experiment cabinet temperature controlEffect property and accuracy are conducive to ensure going on smoothly for space science experiment.