SU847066A1 - Thermal relay - Google Patents

Description

(54) THERMORARELLE

one

The invention relates to automation and instrument engineering and is intended for use in thermal control and thermo-alarm systems.

Thermal relay 1 is known; its disadvantage is that TO4noii cannot control the response and return temperature I and the general relatively low nausea (for a thermal switch with a switching power of up to 150 W).

The technical solution closest to the Dashyum of the invention is a thermal relay containing a thermoelement with a bimetallic sphere and a recoil spring and normal-closed contacts located coaxially with the housing;

However, this device does not provide increased accuracy and reliability of operation, since it does not allow for separate, independent of each other, adjustment of the response and return temperatures.

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

For this purpose, a thermoelement with a bimetallic sphere and a return spring and disconnecting contacts are inserted in the thermal switch, which is located 1P) 1E coaxially with the case. On the ceramic base of the roller, the winding is mounted coaxially with the casing at one of its ends and is adjustable. A screw and a sleeve are installed, the thermoelement and the opening contacts are installed on the threaded base in the other end of the housing, and the adjustment screw is located on the axis of the thermoelement and is connected through the sleeve to the bimetallic sphere.

The drawing shows the structural scheme and the basic electrical scheme of the device CTisa.

The device includes a housing 1, an adjusting winding 2, a ceramic base 3, an annular shoulder 4 located on the inner surface of the housing 1, a thermoelement 5 with a bimetallic sphere 6, normally closed contacts 7 (bridge type) and a return spring 8, an adjusting screw 9i sleeve 10 and resistor 11.

The device works as follows.

When the ambient temperature rises to a predetermined triggering temperature, the bimetallic sphere 6 bends in the opposite original direction, under the action of the return spring 8, the normalized connection, the open contacts 7 are opened and break the working circuit.

To increase the switching power of the thermal switch, after a preliminary adjustment of the response temperatures and the return temperature, it is filled with an inert gas, such as argon.

. If the trigger temperature differs from the predetermined magnitude 1, then by changing the current in the control winding 2 with the help of the resistor 11, the preset trigger temperature is set. When the ambient temperature drops to the desired return temperature, the bimetallic sphere b clicks back to its original position, contacts 7 are closed and the operating circuit is turned on for supply voltage.

The advantage of the described device is the ability to set precise setpoints for response and return temperatures and a relatively large reliably switching power, which can be used in the system. max temperature control and thermo alarm

compact gyrocompasses, for example, of the VEGA type, installed on ships, where they maintain the temperature inside the compact gyroblocks of the main instrument to the nearest tenths of a degree.

Claims (2)

1. Babikov M. A. Electrical apparatuses. M.-L., Tosenergoizdat, 1956, p. 20. 2. US patent number 2813171, cl. 200-113, published. 1965 (prototype). .