SU1432477A1 - Temperature-regulating device - Google Patents

Abstract

This invention relates to a testing technique. The circuit of the invention is to increase the reliability and accuracy of the device. A device for temperature control contains a working chamber 1, a heater 4 mounted on the nitrogen pipe 4, which is placed in a Dyoara b vessel with a cryogenic liquid. On the neck of the vessel Dyora case 7 is installed, in which

Description

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two coaxial saddles. The lower seat 8 is connected to the nitrogen line and the top 9 to the atmosphere. The chamber 10, located between the saddle, is connected to the working chamber 1, and between the seats there is a ball valve I1, which is pressed by the spring 12 to the upper

the saddle 9 and prevents the passage of nitrogen vapor through the hole in the saddle. A pusher 13 of the electromagnet 14 is placed in the hole of the upper seat 9, the control winding of which is connected to the second output of the control unit 3. 1 sludge.

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The invention relates to a test technique, specifically to devices for creating minus temperatures at which the refrigerant has a boiling point below minus.

; The purpose of the invention is to increase the reliability and accuracy of the device.

The drawing shows a device for temperature control.

The device contains a working chamber 1 in which a temperature is created and regulated minus one temperature. A temperature sensor 2 is connected to the input of the control unit 3. The first output of the latter is connected to the heater 4, installed on the pipeline 5, which is placed in a Dewar vessel.6 with a cryogenic liquid — liquid nitrogen.

: On the neck of the Dyoara vessel is installed H1 () there is a housing 7, in which DFA are coaxial saddles, the lower 8 of which is connected to the nitrogen pipeline and the upper atmosphere. Chamber 10, located between the saddles, is connected to a workbench (|) whose chamber 1, in addition, between c4; a ball valve 1 is installed, which is pressed by the spring 12 to the top-top 9 and prevents the passage of nitrogen vapors through the hole in the saddle . A spring 12 is installed in the hole of the lower seat 8, which forms a gap with the ball valve for the nitrogen vapor.

In the hole of the upper seat 9, the length of the pusher 13 of the electromagnet 14 is about, (the control winding of which is connected to the BTOpot Ty output of the control unit 3.

The safety valve 15 is fixed in the housing 7, and the chamber 10 is connected to the H (the gn with the working chamber by the hose 16.

The device works as follows.

When voltage is applied to heater 4, it is heated, 5 liters of heat evaporates liquid nitrogen, thereby creating an overpressure above the nitrogen surface, which raises nitrogen from vessel 6 through the nitrogen pipe 5 through the hole in the bottom

0 a saddle 8, a chamber 10 and a hose 16 into the working chamber, where energy is directly removed in the form of the latent heat of evaporation of the refrigerant — liquid nitrogen.

5 In this case, the control unit 3, acting on the controlled process according to one of the laws (AND; PD; PI; FID) of the control, smoothly brings the temperature in the working chamber to the preset,

0 after which the electromagnet 14 is triggered by moving the pusher 13 and the ball valve 11 down, blocking the opening of the lower seat 8 and the release of nitrogen from the vessel, while carrying out 5 with the combination of any of the laws AND, PD, PI, PID control with positional.

At the moment when the ball valve 11 closes the opening of the lower seat 8, the nitrogen in chamber 10 and gsha 16 comes out through the open hole of the upper saddle 9, thereby avoiding temperature overshoot and ensuring high reliability and accuracy of adjustment.

When the temperature in the working chamber 1 is higher than necessary and set on the control unit 3 and fixed by the sensor 2, the control unit 3 gives a signal to turn off the electromagnet 14, after which the spring 12 pushes the ball valve

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11 from the hole of the lower seat 8, opening the exit of nitrogen into the chamber 10, n presses the ball valve to the upper seat 9, closing the outlet of nitrogen B atmosphere.

After the liquid nitrogen in the Dewar has been consumed, which is indicated by the control panel display (temperature readings change in elevation), the device shuts off,

Claims (1)

Invention Formula - A temperature control device containing a working chamber connected to a Dewar vessel filled with a cryogenic liquid; a nitrogen wire at the end of which is placed - 1D32477 A liquid is installed in a heater connected to the first output of the control unit, the input of which is connected to a temperature sensor located in the working chamber, characterized in that, to increase the reliability and accuracy of the device, a 1Q flap is installed on the neck of the Dewar vessel. case in which two are made coaxial saddles, the lower one of which is connected to the nitrogen pipeline, the upper saddle with the atmosphere, and the chamber between them is connected to the working chamber, and between the saddles there is a ball valve spring-loaded towards the upper saddle in which the electromagnet pusher is placed connected to the second output of the control unit.