SU1403027A1 - Climatic chamber - Google Patents

Abstract

The invention relates to testing equipment, in particular to climate chambers for testing electronic products for the effects of both low and high temperatures. The aim of the invention is to increase the efficiency of the climate chamber and simplify its operation.

Description

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Structurally The climate chamber contains a teploizopopirovanny body 1, working capacity-3, air channels 4, the second thermal sensor 12 in the form of a selsyn sensor I3 and a selsyn receiver 15, a bypass channel 1 and balanced valve I4. The thermal sensor 12 is made in the form of a temperature-sensitive wire uniformly tensioned across the cross section of the channel 4. One end of the wire is fixed with the possibility of reciprocating motion on the sensor stem of the temperature sensor, the other end - on the shaft of the selsyn sensor 13 ,. The selsyn receiver shaft 15 is kinematically connected with balanced valves 14 installed at the inlet of the refrigerator 6 and the bypass channel 11 "2 Il.

The invention relates to testing equipment, in particular to climate chambers for testing electronic products for the effects of both low and high temperatures.

The aim of the invention is to reduce energy costs and simplify the design of the climate chamber.

Fig. Represents a climatic chamber, an abundance of view, a section; in Fig „2 - view A in Fig.1.

The climatic chamber consists of a housing 1 with thermal insulation 2, in which the working tank 3 is located, air circulation channels 4, an heat source 5 in the form of an electric heater installed in channel 4, an unregulated cooler 6, fans 7 and 8 at the inlet and outlet from the tank 3, the control unit 9, the first thermal sensor 10, the bypass channel 1 1, the second thermal sensor 12 with a selsyn sensor 13 installed at the entrance to the refrigerator 6 and a channel 11 of balanced dampers 14 connected to the shaft of the selsyn receiver 15. Air movement at regul The shutters are indicated by arrows 16 and 17 "

The thermal sensor 15 consists of a frame 18, in the plane of which the thermosensitive wire 19 is stretched on the rollers 20 mounted on the frame 18 of the temperature setting housing 21 in which the groove 22 is made, axis 23 installed in the groove 22 connected to one end of the wire 19, a rod 24 of a temperature sensor, kinematically connected with an axis 23, a limb 25 of a rod 24 of a temperature selector of a microswitch 26, kinematically connected with an emphasis of the rod 24, a bracket 27 fastened on a frame 18, mounted on a shaft of a selsyn sensor 13 of a drum 28, springs 29 related to another the end of the wire 19, and the adjusting screw 30, installed in. bracket 27.

The climate chamber works as follows

For operation in the temperature range from +20 to -60 ° C, the heater 5 is set to the minimum power mode, and at the temperature controller 25 of the additional temperature sensor 12 the necessary temperature of the working volume 3 is set. At the same time, the microswitch 26 provides power supply to the selsyns 13 and 15 and the rod 24 of the setter, moving i in the groove 22 of the housing 21, the axis 23, for example, lowers the temperature-sensitive wire 19, the second spring-loaded end of the wire 29 moves in the same direction, rotating the drum 28, which is wound several times lko turns of wire 19. The drum 28 is rotated together in the shaft Resolver transducer 13 at an angle q; where

1 is the length of movement of the wire 19; g - the radius of the drum 28, which is wound on the wire 19,

At the angle Cf, on which the shaft of the selsyn 13 is turned, the shaft of the selsyn receiver 15 is rotated, since they are connected according to the circuit of the electric shaft. Toey work in the indicator mode. Celsin 15 turns the balanced flaps 14 at the same angle, redistributing the air flows along the arrows 16 and 17 so that tem31403027

air temperature in the area of thermal sensor to

and, therefore, in working capacity 12

bone 3 was striving for a given one. Thus, the required temperature is determined by the position of the axis 23 or the position of the rod 24 relative to the setting body 21 "

As the air cools, for example, the temperature of the wire 19 also decreases and its length decreases. This contraction acts in opposite phase with a driver signal on the shaft of the sensor 13 and then through the receiver receiver 15 converts to the angle of rotation of the balanced flaps 14 and accordingly air in the chamber. Thus, there is negative feedback in the system.

When the set temperature is reached, the system goes into temperature stabilization mode in the working tank 3 "At this point, the length of the wire 19 corresponds to the set temperature If there is a deviation from the set air temperature in the area of the sensor 12 and in the working tank 3, this will affect the wire length 19 the account of its spring-loaded end is reflected at the angle of rotation of the shaft of the selsyn sensor 13 and then again through the selsyn receiver 15 at the angular position of the balanced flaps 14, which, due to the negative feedback, provide ivayut maintaining predetermined value temperaturYo

The tensioning of the spring-loaded end of the wire 19 is carried out by the adjusting screw 30o. In this case, the force from the side of the spring 29 to the wire .19 must exceed the resistance moments acting on the wire from the side of the rollers 20, as well as from the side of the balanced dampers 14 transmitted through the electric shaft to sensor 13, over the entire temperature range.

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To improve the accuracy of the system, these moments of resistance should be minimized.

The deflection angle of the flaps 14 by one degree deviation of the temperature bz Det determined by the length of the wire 19 and the diameter of the drum 28

0 Thus, the use of the proposed climate chamber when regulating the temperature in the range from +20 to -60 ° C ensures economical operation due to

5 reducing power consumption

about 0.5 kW. one camera, and also simplifies its design

Claims (1)

0 claims . The climate chamber contains a housing with a working capacity located in it with the formation of air ducts between them in which the fans are placed, the heat source and the uncontrolled cold source connected to the control unit connected to the first temperature sensor installed in the working tank differing from in order to simplify the construction and increase the efficiency of the chamber, it is additionally equipped with a second thermal sensor, a selsyn sensor and a selsyn receiver, balanced dampers at the inlet of the refrigerator and bvodnogo channel, wherein the second sensor is designed as a uniformly tensioned 0 across the cross section of the air channel of the heat-sensitive wire, one end of which is fixed with the possibility of reciprocating movement of the temperature sensor of the second temperature sensor on the stem of the temperature sensor, the other end on the shaft of the sensor, and spring loaded, with the shaft of the receiver of a sensor, which is kinematically connected with balanced valves. 0 five ABOUT t t w s s .2 // to cb gz