SU964588A2 - Liquid level relay - Google Patents

Description

(5) LIQUID LEVEL RELAY

The invention relates to instrumentation.

According to the main author. It is known that the liquid level relay contains an electromagnetic relay, a permanent magnet float sensor and ferromagnetic pole tips made in the same plane asymmetrically with respect to the center of rotation of the float sensor of trihedral prisms with ferromagnetic shoes associated with. the separator. and the magnetic circuit of the electromagnetic relay, the angle at the apex of the prisms is an additional one. is n to the full angle of rotation of the float sensor l.

However, the known level gauge does not have the ability to change the trigger limits. 20

The purpose of the invention is to provide a change in the limits of operation.

This goal is achieved by the fact that triangular prisms and ferromagnetic towers

Poppies are installed on the board, which can be rotated relative to the splitter.

FIG. 1 shows the structure of the proposed relay, general view; in fig. 2 is a view A of FIG. one; in fig. 3 board designs with shoes pressed into it; in fig. k is a section BB in FIG. 3

Claims (2)

The device contains magnetic cores 1 and 2, coil 3, ferromagnetic measles C, return spring S and normally open and normally closed electrical contact groups 6 and 7. Magnetic cores are pressed into separator 8 and connected to ferromagnetic pole pieces made symmetrically in the same plane relative to the center of rotation of the float sensor of trihedral prisms 9 and 10 s fer. magnetic shoes 11- in contact with the magnetic cores 1 and 2. At the same time, the shoes are embedded in the board 12, 36 which is fastened with screws 13 to the separator 8 ,, Circular grooves provided on the board 12: H allow to rotate it together with prisms 9 and 10 around the axis of rotation of the float sensor. The latter consists of a flat permanent magnet 15, a lever 16 and a float 17. The magnet rotates on an axis 18 fixed to the separator 8. The level switch operates as follows. In operation, the terminals of the coil 3 are connected to a power source (not shown), the bark 4 is held by the spring 5 in the deflected position, the magnet 15 under the action of the float 17 lies on the horizontally oriented faces of the prisms 9 and 10. At the same time, the polarity on the coil: 3 is such that the magnetic flux created by it is attenuated by the field of the permanent magnet 15. The device, through a normally closed electrocontact group 6, processes the signal according to the lower limit value of the liquid level. As the liquid level rises, the magnet 15 under the action of the pushing force applied to the float 17 rotates jfio clockwise and at a certain moment is captured by the second pair of faces of prisms 9 and 10 and, at the same time, due to the flip of the poles, its magnetic flux is summed up - nitny relay. Under the action of this total magnetic field, the measles k is attracted to the core (magnetic core 2) and throws its key over the normally open contact group 7, thereby signaling that the upper limit value of the liquid level has been reached. Subsequently, as the level of the liquid decreases at a certain moment, the magnet 15 is detached from the prisms and starts to rotate counter clockwise. In this case, the relay coil, operating in the solenoid mode, holds the core in the tightened position. Only after the magnet has reached its initial horizontal position does the magnetic flux in the relay weaken again, since there is a change in polarity, and the measles disappear under the action of the spring 5. The electric contact group 6 is closed again and a signal is received that the liquid level has reached its lower value. Thus, the relay has two lines-process, respectively on the lower and upper limit of the liquid level. To change the position of the relay actuation lines, for example, displacing them down the height of the controlled liquid column, unscrew the screws 13, rotate the board 12 counterclockwise by an angle corresponding to the calculated offset value (determined by simple geometrical calculations taking into account the size of the float sensor) subsequent fixation of the board on the divider 8. Changing the position of the relay trigger lines up the height of the liquid column is achieved by turning the board 12 clockwise. The adjustment of the device can be carried out on a pattern-protractor, tared in linear displacements. . Thus, in the proposed device, the operation limits are changed, which expands the technological capabilities of the level switches. The formula of the invention Relay liquid level by author. St. No. 8072 3, excluding the fact that, in order to ensure the change of the limits of operation, triangular prisms and ferromagnetic shoes are mounted on the board located on the separator so that it can be rotated. Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2652963, cl. B 05 D 9/12, 1978 (prototype). 1.7 / fZ F. f qri / yy f1 1Z ff-ff Fe / g.