SU22529A1 - Alarm device for monitoring fan operation - Google Patents

Description

Patent no. 16566 describes a signaling device for controlling the operation of a fan, in which an electrical contact is applied, connected to a signal circuit, a rod end pipe fixed to a wall and connected to one pole of the signal circuit and rotated plate axis, connected to the other pole of the same circuit. The swinging plate on the axis during the normal operation of the fan is deflected by a stream of air, and the contacts of the signal circuit are open; when the fan fails, the plate comes in contact with the ball of the rod and, thus, closes the circuit, gives a signal.

In the proposed invention, which is a modification of the device described above, the plate is wobbled in the form of a disk, fitted with a single cut edge and half covered; sections of the ventilation pipe shields.

In the schematic drawing of FIG. 1 shows a front view of the device with a partial, sectional view; FIG. 2 is a side view of it with. -particular vertical section; FIG. 3 is a top view of the device.

In the metal case 1 located in the ventilation pipe, a disk 3 is placed, which sits on the axis 10 coinciding with the diameter of the disk 3, one end of which is fastened in the bearing 26, and the other, passed into the hermetically closed chamber 4, carries a cam 12 designed for to stop or weaken the operation of the fan, press the spring contacts 11 and 22 of the signal circuit and thereby close it. In order to increase the force bringing the disk 3 into equilibrium, the latter has a cut from one edge and, moreover, From the same edge, half-cross the vent pipe with shields 20 and. 21, Hermetically closed chamber 4 is covered with a lid 5, provided with a window 7 of mica or glass, protected by a metal grid.

Normally, when the fan is operating, the spring contacts 11 and 22 are open, and the disk 3 is deflected by jet as shown in FIG. 2. At weakening of a stream of air (or gas), i. when the fan malfunctions, the disk 3 under the action of its weight assumes a position (vertical or horizontal), at which cam 12 connects contactsil and 22, and the circuit of the current signaling device closes.

 The subject matter of the invention.

Modification of the signaling device for controlling the operation of the etillor according to patent No. 1656,6, characterized in that

so that the disc 3 that is disconnected under the action of the ventilator of Gtora has one edge: a shear and sitting on the axis 10, which coincides with the disc diameter and the t connected with the contact device, is covered to half of the cross section of the ventilation pipe 21.- -