SU1265875A1 - Temperature-sensitive switch - Google Patents

Abstract

The invention relates to electrical engineering, in particular to thermal switches used to turn off electrical devices operating in explosive and thermally loaded environments. The aim of the invention is to expand the functionality. Thermosensitive (a circuit-breaker includes a housing 1, bushings 2., 3, springs 4, 5, moving contact 6, main heat-sensitive melting element (ТППЭ) 7, additional ТЧПЭ 9, main 12 and additional 14 moving disks (ПД), electrical leads 13, 15, 17, flexible wire 18, fixed contacts 19, 20. When the limit temperature is reached, the TSPE 7 softens and decreases in the axial direction, the spring 5 lengthens and its force decreases, while the spring 4 opens one electrical circuit and closes the other - extra electric the circuit is connected with devices operating in thermally loaded and explosive I environments. With further temperature increase, the additional CTPE 9 (L melts and decreases in the axial direction, the spring 4 lengthens and its force decreases, while the spring 5 acts on the moving contact 6 , opens an additional electrical circuit. 1 Il.

Description

The invention relates to electrical engineering, in particular to thermal switches used to turn off electrical devices operating in explosive and thermally loaded environments .;

The purpose of the invention is to expand the functionality.

The drawing shows a temperature-sensitive switch, the cut.

The thermosensitive switch comprises a housing 1 in which bushings 2 and 3 are placed, elastic elements in the form of springs 4 and 5, a movable contact 6, a main thermosensitive melting element 7 with an axial bore 8, an additional thermo sensitive melting element 9 with an axial bore 10 and an additional hole 11, the main movable disk 12 with an axial hole in which the electrical output 13 is located, an additional movable disk 14 with an axial hole in which the electrical output 15 is located.

The electrical leads 13 and 15 are insulated respectively from the sleeves 2 and 3 by the dielectric 16. In the sleeve 2 there is an additional electrical lead 17 electrically connected to the moving contact 6 through the housing 1 - and the flexible wire 18 placed in coaxially arranged additional holes 11 and 16 . At the end of the electrical output 13 there is a fixed contact 19, and at the end of the electrical output 15 there is a fixed contact 20.. I

Thermal switch operates as follows.

At the permissible operating temperature, contacts 6 and 19 are closed, the necessary contact pressure is provided between them, and a load current passes through them. From the electrical lead 17 to the electrical lead 15, the current passes through the flexible wire 18, the movable contact 6, the fixed contact 19, as well as through the sleeves 2, the housing 1, the movable contact 6, the fixed contact 19. Thus, the sliding contact between the movable contact 6 and housing 1 is shunted with flexible wire 18.

When the temperature reaches the limit, the thermosensitive melting element 7 softens and decreases

in the axial direction, the elastic element spring 5 is lengthened and its force is reduced. At the moment when the force generated by the spring 5 becomes

less force of the other elastic element - spring 4; the latter opens the electrical circuit, while the movable contact 6 under the action of the spring 4 closes another electrical

a circuit formed by a fixed contact 20 and an electrical output 13 with an electrical output 17. The load current from the electrical output 17

to electrical outlet 13 passes

through flexible wire 18, movable contact 6, fixed contact 20, as well as through sleeve 2, housing 1, movable contact 6, fixed contact 20. Flexible wire 18 thanks to

its elasticity does not interfere with the movement of the movable contact 6 when opening and closing electric circuits. Current, passage from electrical output 17 to electrical

Pin 13, forms an additional power supply circuit for electrical devices.

11 With a further increase in temperature above the established norms, the thermosensitive melting element 9 melts, decreases in the axial direction, the spring 4 lengthens and its force decreases less than the force of the spring 5, which, acting on the moving contact 6, breaks the power supply circuit of electrical devices, and the moving contact 6 will stop in a neutral position. Thus, the present invention allows to extend the functionality of a switch by breaking the electrical supply circuits of one group of electrical devices and forming electrical supply circuits of other electrical devices operating in thermally loaded and explosion-hazardous environments with subsequent breaking of these electrical circuits.

Claims (1)

Invention Formula A thermosensitive switch comprising a housing, two terminals located on opposite ends of the housing, a movable contact placed in the housing, a fixed contact installed at the end of one of the terminals, elastic elements in the form of springs, installed with the possibility of acting on a moving contact, an axially sensitive thermal element. a hole, a flexible wire connected at one end to a moving contact, and the other to an element electrically connected to the housing, and a moving disk with an axial hole, mouth new between the movable contact and the heat-sensitive melting element and pressed to the latter by one of the elastic elements, characterized in that, in order to expand its functionality, it is equipped with an additional heat-sensitive melting element with an axial hole, an additional fixed contact, an additional moving disk with an axial hole and an additional output, an additional temperature-sensitive melting element is installed between the moving contact and the additional moving part An additional fixed contact is installed at the end of the other output, an additional movable disk is installed between one of the ends of the body and an additional heat-sensitive melting element and pressed to the last by another elastic element, the additional output is installed at the specified end of the body and is integral with the element connected to the housing, an additional temperature-sensitive melting element and an additional movable disk are made with additional coaxial holes in which is placed a flexible wire.