CN102589708A

CN102589708A - Low-energy-consumption temperature-control Dewar flask

Info

Publication number: CN102589708A
Application number: CN2012100193823A
Authority: CN
Inventors: 陈安森; 汪洋
Original assignee: Shanghai Institute of Technical Physics of CAS
Current assignee: Shanghai Institute of Technical Physics of CAS
Priority date: 2012-01-20
Filing date: 2012-01-20
Publication date: 2012-07-18

Abstract

The invention relates to a low-energy-consumption temperature-control Dewar flask. A vacuum sealing container consists of internal and external metal cylinders; the lower side surface of the internal cylinder is provided with a low-heat-transfer plate, a heating piece, a Dewar cooling surface, a temperature measuring element and wiring terminals in sequence; and a current output type PID (proportion integration differentiation) temperature controller is connected with the internal cylinder. The Dewar flask adopts the low-heat-transfer plate so as to avoid direct temperature reduction of the cold amount of the internal cylinder to the cooling surface. The low-energy-consumption temperature-control Dewar flask has the advantages of accuracy in temperature control, wide temperature control range, less liquid nitrogen loss and convenience in use, and is especially applicable to variable-temperature performance test of infrared detector chips or components.

Description

A kind of low energy consumption temperature control Dewar

Technical field

The present invention relates to a kind of Dewar flask, be specifically related to a kind of low energy consumption temperature control Dewar.

Background technology

At present, infrared eye generally is installed in the Dewar flask and uses, and in Dewar flask, pours into liquid nitrogen; To improve the detection sensitivity of detector; In use, often to know the relation of detector sensitivity and temperature, the most frequently usedly in engineering will realize 100-170K warm area working range; This just needs the temperature control Dewar flask to realize; General temperature control Dewar flask adopts dual mode to realize: first kind is to add a heating resistor at the huyashi-chuuka (cold chinese-style noodles) edge of detector, and second kind is to combine heating resistor, and the injection rate IR of a up-down litter control liquid nitrogen is installed in liquid-adding tube simultaneously.First kind of mode is by the resistance heating temperature that raises; Because huyashi-chuuka (cold chinese-style noodles) is near liquid nitrogen temperature, intensification will consume a large amount of liquid nitrogen and temperature can not accurately be controlled, and the second way is the injection rate IR with auxiliary litter control liquid nitrogen; During the control different temperatures, regulate the height of litter.There is obvious deficiency in the use in above-mentioned dual mode; First kind of energy consumption is too big, the difficult control of the height of second kind of litter, and liquid nitrogen has uncertainty along the injection rate IR on litter chassis in addition; The difficult accurate temperature controlling of realizing, more than these bring inconvenience for uses of temperature control Dewar.

Summary of the invention

The technical matters of the present invention's solution is to realize that through heating resistor there is the excessive problem of energy consumption in the mode of temperature control, and utilize the injection rate IR of heating resistor and litter control liquid nitrogen to realize that there is the complicated and accurate inadequately problem of temperature control in the mode of temperature control simultaneously.In order to satisfy application demand, overcome the inconvenience that existing temperature control Dewar flask uses, the present invention proposes a kind of low energy consumption temperature control Dewar flask.

The technical scheme that technical matters adopted that the present invention solves is: between huyashi-chuuka (cold chinese-style noodles) and inner bag, insert the hot plate of passing at the low; Huyashi-chuuka (cold chinese-style noodles) is designed to detachable solid surfaces; Heating plate is installed in bottom surface at huyashi-chuuka (cold chinese-style noodles), and installation connection plug and temperature element on the huyashi-chuuka (cold chinese-style noodles) upper surface circumference form the temperature control Dewar flask.It carries out temperature control with current-output type PID high precision temperature controller to Dewar flask, constitutes temperature control alternating temperature Dewar flask.

The invention has the beneficial effects as follows, huyashi-chuuka (cold chinese-style noodles) is separated with pass at the low hot plate and inner bag, avoided of the direct cooling of inner core cold huyashi-chuuka (cold chinese-style noodles); Regulate the scope of the controllable thickness system alternating temperature warm area of low conductive plate; A large amount of consumes of liquid nitrogen when having reduced heating plate work, the heating plate under the huyashi-chuuka (cold chinese-style noodles) cooperates temperature controller can realize accuracy control over temperature, and infrared eye is a kind of Detection of Weak Signals device; The current-output type controller can be avoided the interference of switching mode controller to infrared eye; The realization scope of this instance temperature control Dewar is 100K-170K, and its precision is ± 0.1K that this temperature control Dewar has been used for the alternating temperature performance test of wind and cloud series satellite with infrared detector chip.

Description of drawings

Fig. 1 is a temperature control module structural drawing of the present invention.

Fig. 2 is whole Dewar structure figure of the present invention

Fig. 3 is a temperature controller schematic diagram of the present invention.

Among Fig. 1: 1. temperature control module, 2. dewar window, 3. the thermometric interface 4. adds hot interface, 5. Dewar temperature controller, 6. Dewar inner core, 7. Dewar urceolus.

Among Fig. 2: 1-1. Dewar huyashi-chuuka (cold chinese-style noodles), 1-2. temperature element, 1-3. heating plate, the 1-4. hot plate of passing at the low, cold of 1-5. Dewar, 1-6. Dewar transition cold head, 1-7. binding post.

Dewar characteristics of the present invention are on the conventionally test Dewar, to increase temperature control module as shown in Figure 2, and temperature control module 1 is installed in the Dewar structure as shown in Figure 1, and the Dewar hot plate 1-4 that passes at the low is installed between inner core 6 and the Dewar huyashi-chuuka (cold chinese-style noodles) 1-1; The hot plate 1-4 that passes at the low adopts the material of poor heat conductivity, to increase the thermal resistance of inner core 7 and Dewar huyashi-chuuka (cold chinese-style noodles) 1-1, the buffering rate of heat transfer; Reduce the liquid nitrogen consume; The film heating element of circles such as heating plate 1-3 employing and Dewar huyashi-chuuka (cold chinese-style noodles) 1-1 heats up evenly huyashi-chuuka (cold chinese-style noodles), the raising accuracy of temperature control; After once injecting liquid nitrogen, can be controlled at for a long time on the temperature spot of setting.

Embodiment:

Below in conjunction with accompanying drawing and instance the present invention is further specified.

In Fig. 1; The whole temperature control module of Fig. 2 is installed in the Dewar sideway stance; Wherein cold 1-6 of Dewar transition directly contacts with the interior liquid nitrogen of Dewar; Temperature element 1-7 and heating plate 1-3 through thermometric interface 1-3 with add hot interface 1-4 and Dewar temperature controller 1-5 links together, whole Dewar adopts vacuum seal to weld, and after the Dewar vacuum exhaust, pours into liquid nitrogen and just can utilize temperature controller 5 to carry out temperature control.

In Fig. 2; Cold 1-6 of Dewar transition and cold 1-5 of Dewar are fixed together through the mode of counterbore screw; At cold 1-5 of Dewar low heat-conducting plate 1-4 and heating plate 1-3 are installed successively then; Low heat-conducting plate adopts the material of poor heat conductivity, and such as PVC, epoxy plate, plastics and paper etc., and low heat-conducting plate 1-4 and heating plate 1-3 are through the pressure fixing between cold 1-5 of Dewar and the Dewar huyashi-chuuka (cold chinese-style noodles) 1-1 together; Cold 1-5 of Dewar and Dewar huyashi-chuuka (cold chinese-style noodles) 1-1 fix through the straight hole screw; Temperature element 1-2 adopts DW-3 glue to be installed on the huyashi-chuuka (cold chinese-style noodles), and binding post is welded on the huyashi-chuuka (cold chinese-style noodles) through beaded glass, so that heating plate 1-3, temperature element 1-2 and infrared eye lead-in wire are drawn from Dewar.

Among Fig. 3: M is a digital current output type PID Based Intelligent Control temperature panel table, and T is a power transistor, and R1, R2 are resistance, and 1-4 is a heating plate; D1, D2 are diode, and C is a filter capacitor, and T is a transformer, and AL1 is an overheat switch; A is a reometer, and V is a voltage table, and 1-2 is a temperature element.

The employing PID electric current way of output temperature control of Dewar temperature controller, like Fig. 3,220 volts of output 25V DC voltages after transformer T step-down, diode D rectification, capacitor C filtering of power supply; Be added on the transistor T collector current-limiting resistance R2; Temperature panel table M is the indication of K temperature, temperature indication range 73.1-322.9K, and temperature is tested by the temperature element D in the Dewar; The control of table is output as 0-20mA; The conducting that comes driving transistors T by the voltage drop of resistance R 1 whether, reometer A, voltage table V show electric current and the voltage on the heating plate respectively, the switch terminals AL1 of controller does Dewar overtemperature emergency power off protection.When huyashi-chuuka (cold chinese-style noodles) did not reach design temperature, liquid nitrogen was lowered the temperature to huyashi-chuuka (cold chinese-style noodles), near design temperature point the time; Table M begins to export Control current, to heating plate RL heating, looks actual temperature and exports different electric currents with the size of design temperature; The big output current of the temperature difference is big; The output current that has a narrow range of temperature is little, until a metastable Current Control being arranged on design temperature point, does not have obvious current-jump and disturbs; RL is connected on the earth terminal place can reduce outside interference, and this circuit can be realized the precision temperature control of Dewar at 100-170K.

Claims

1. low energy consumption temperature control Dewar flask; The vacuum-tight container of forming by inner core (6) and urceolus (7) round metal column casing; At inner core (6) downside low heat transfer guide plate (1-4), heating plate (1-3), Dewar huyashi-chuuka (cold chinese-style noodles) (1-1), temperature element (1-2), binding post (1-7) are installed in proper order; It is characterized in that: between inner core (6) and Dewar huyashi-chuuka (cold chinese-style noodles) (1-1), insert pass at the low hot plate (1-4), heating plate (1-3), Dewar huyashi-chuuka (cold chinese-style noodles) (1-1), temperature element (1-2) are installed, the PID temperature controller (5) of a current-output type is attached thereto.

2. a kind of low energy consumption temperature control Dewar flask according to claim 1 is characterized in that: the described hot plate of passing at the low (1-4) adopts PVC, epoxy plate, plastics or the paper material of poor heat conductivity.

3. a kind of low energy consumption temperature control Dewar flask according to claim 1; It is characterized in that Dewar huyashi-chuuka (cold chinese-style noodles) (1-1) is for floated; Can dismantle between described Dewar huyashi-chuuka (cold chinese-style noodles) (1-1) and the hot plate of passing at the low (1-4) and the heating plate (1-3), so that change the heating plate (1-3) of different capacity and the hot plate of passing at the low (1-4) of different-thickness.