SU117439A1 - Contactless thermal relay sensor - Google Patents

Description

For non-contact thermal protection of automation and measurement devices, non-contact thermal relays-sensors are used that contain a composite single window (Core made of thermomagnetic and non-thermomagnetic alloys with windings placed on its rods.

In order to increase the reliability of such devices and to maintain the inductive resistance of the supply winding unchanged, it is proposed to position this winding on a first rod made of a ferromagnetic material that does not change its magnetic temperature from temperature; The secondary winding of the relay should be placed on a rod made of an alloy with a Curie point equal to the temperature setting of the device.

FIG. 1 shows a schematic diagram of the proposed device; in fig. 2, 3 and 4 are its design options.

The device is a contactless thermal relay sensor with a composite core, in which the rod is made of a ferromagnetic material that does not change its magnetic permeability with temperature, and the rod 2 is of an alloy whose point is equal to the temperature setting of the device.

A power winding 3 is placed on the rod (I) and is connected to an alternating current source. On the rod 2 there is a secondary winding 4, to which the actuator 5 is connected (directly or through a magnetic amplifier 6).

The proposed device works as follows. When the medium reaches a predetermined value equal to the Curie point of the material of the rod 2, the magnetic properties of this rod abruptly change. In this case, the emf induced in the winding 4 decreases sharply if this rod is made of a ferromagnetic material, or it rises sharply if it is made of an antiferromagnet.

No. 117439-2 -

If the rod 2 is made of a thermomagnetic alloy, then the emf. winding 4 will vary smoothly with temperature.

Thus, a thermal relay-sensor with a rod 2 of a ferromagnet functions as a relay with normally closed contacts and an independent power source, and with an antiferromagnetic rod 2, the role of a relay is with normally open contacts. When making a thermomagnetic alloy rod 2, a thermal relay-sensor can be used to control and measure the temperature.

In the core of the device, a third rod 7 (FIG. 2), made of a material similar to the rod I, with two windings 5 and P placed on it can be applied. The winding 8 simulates a normally open contact, and the winding 9 comes through a rectifier Yu co secondary winding the device and saturates the third rod 7, which can be made of an antiferromagnetic alloy. In this case, the winding 11 placed on it (FIG. 3) will simulate a normally open contact. A fourth rod 12 made of an alloy having a magnetic permeability dependent on temperature can also be used. In this case, in the winding located on the rod 12, a smoothly varying emf will be induced.

Subject invention

Claims (4)

1. A non-contact thermal relay-sensor containing a composite single-core core made using thermomagnetic and non-thermo-magnetic alloys with windings placed on the core rods, which in order to increase the reliability of the device and keep the inductance of the supply winding unchanged, the latter on the first rod made of ferromagnetic material, which does not change its magnetic permeability with temperature, and the secondary winding is located on the rod of alloy and with a Curie point equal to the temperature setting of the device. 2. The device according to claim 1, using in the core a third rod made of a material similar to the first rod with two windings placed on it, of which the first simulates a normally open contact, and the second comes through a rectifier to the secondary winding of the device and saturates the third kernel. 3. The device according to claim 1, using a third rod made of an anti-ferromagnetic alloy on which a winding is placed, simulating a normally open contact. 4. The device according to claim 3 using a fourth rod made of an alloy having a dependent magnetic permeability on temperature and a winding located on this rod with a continuously varying emf.