SU140910A1 - Thermorelay - Google Patents

Description

The invention relates to thermal control equipment.

Thermal switches with bimetallic elements and permanent magnets for instantaneous opening of contacts are known.

The present invention aims to improve the accuracy of the thermal relay operation and simplify its design and adjustment.

A distinctive feature of the proposed thermal relay is the use of a rotary lever of a mechanical multiplier, which carries a movable contact and a measurable magnet bore on a long arm, and an eccentric support on a short arm, which is affected by a bimetallic element.

The eccentric is made rotatable, due to which it is possible to control the size of the initial gap between it and the bimetallic element, i.e., to change the set point of the response temperature.

The drawing shows the device thermostat.

Bimetallic element / rigidly fixed at one end to the body 2 of the thermal switch. A tooth 5 is fastened on the free end of the bimetallic element. An adjustable eccentric 4 is located under the tooth. lever pin 10.

The permanent magnet 9 and the fixed contact // are rigidly fixed on the housing. 2

When the temperature changes, the bimetallic element / bends and the gap between the tooth 3 and the eccentric 4 decreases. At the moment of the impact of the tooth on the eccentric, a "mechanical multiplier - a rotary lever 6 with different arm lengths is activated. Mechanical multiplication is obtained by varying the magnitudes of the eccentric and moving contact 10.

For example, the three-ratio of the arms of the lever is 1: 10 and the movement of the prong 5, with ecocentric 4 by 0.1 mm, the moving contact 9 will move by 1 mm, ..,

Takshi-zom, the thermostat thermostat co-construction provides for the existence of a c) movement of the movable contact with minor changes in temperature.

The lever, turning around the axis 7, overcomes the attraction of the core 8 to the permanent magnet 9 and instantly opens the contacts 10 and //. The same magnet ensures instantaneous closure of contacts when stopping the pressing of the prong 5 on the eccentric 4 as a result of a change in temperature towards the initial one.

The setting of the operation temperature of the thermostat is made by changing the initial gap between the tooth 3 and the eccentric 4, which is done by acting on the adjusting screw 5, which ensures the corresponding rotation of the eccentric 4.

Subject invention

A thermostat with a bimetallic element and a permanent magnet for instantaneous opening of contacts, characterized in that, in order to increase the accuracy of operation and simplify adjustment of the relay, a rotary lever ("mechanical multiplier) carrying a movable contact and a constant magnet pole was used, on the short arm, an eccentric stop that senses the pressure of the bimetallic plate and is pivoted to adjust the distance between it and the plate.

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