RU1793251C - Float switch - Google Patents

Abstract

) Usage: in liquefied gas tanks to control the level limit and to prevent the possibility of overfilling them. SUMMARY OF THE INVENTION: the relay comprises a float chamber 1 made of diamagnetic material, inside which a float 2 is placed, carrying a piston 3 with a permanent magnet 4, magnetically controlled contacts 11, 12 are located one above the other. Perforated rubber gaskets 9, 10 are placed on the flanges of the chamber 1; there is an oiler 13 for lubricating the mirror of the chamber 1. 1 ill.

Description

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FIELD OF THE INVENTION This invention relates to techniques for controlling the level limit in tanks of liquefied petroleum gas, as well as other liquids. ,

Limit level sensors are known that contain a vessel, a non-magnetic tube, float, magnet and relay, moreover, a ferromagnet plate is mounted on the float, and a magnet and relay are placed on both sides of the tube.

The disadvantages of this solution include the complexity of the design. There is a danger of sticking of the parallel walls of the float on the inner surface of the float chamber.

The closest in technical essence to the claimed solution is a float device containing a float with a magnet and two magnetically correct contacts mounted on the housing,

A disadvantage of the known device is the low reliability

The aim of the invention is to increase reliability. ,

To achieve the goal in the float relay, the float is made in the form of a bell open on the liquid supply side, connected to the piston, bearing an annular permanent magnet fixed between two sealing elements, magnetically-controlling contacts are placed on the outside of the case, and placed on the flanges of the case perforated rubber pads. The lower contact is made normally closed, and the upper one is normally open. Perforated gaskets are placed on the flanges of the housing. -: -. /. ; ., :: ..; - -:.

This design of the relay eliminates the closure of the float on the walls of the float, on the walls of the chamber and a complex electrical circuit for switching on the contacts.

The drawing shows a float level switch in section.

The float level switch contains a float chamber 1 made of non-magnetic material and communicates with a controlled vessel (not shown in the drawing). A float 2, made in the form of a bell, carrying a piston 3, equipped with a permanent magnet 4, is placed inside the chamber 1. Rubber sealing rings 5 and 6 provide sealing of the piston 3 and securing the annular magnet 4. The cover 7 provides sealing of the piston 3. The chamber 1 is closed by a cover 8 with gaskets 9, 19. On the outer wall of the chamber 1 are fixed device 11 with agitator control m and the contact device

12. Oiler 13 provides lubrication of the mirror of the camera 1.

Float level switch operates as follows.

At a low level of liquefied gas, the vapor phase enters the chamber 1 and passes through the channels into a controlled liquid. At this moment, the float 2 rests on the gasket 10, and its internal cavity

0 filled with vapor phase. The area of the holes in the gasket 10 is less than the total area of the holes in the gasket 9. This helps to smooth out the impacts of the vapor phase. With a sharp increase in gas pressure

5 inside the chamber 1, it is possible to bounce the float 2, but this does not lead to the destruction of the device, since there is a metal – rubber collision. As the level of liquefied gas rises, it begins to enter chamber 1, displacing the gas. At this moment, the vapor phase is locked inside the chamber 1 by a liquid mirror and behaves autonomously. Fluid. Freely enters the space between the walls of the chamber 1

5 and the float 2, it cannot enter the float 2 occupied by the gas. Upon reaching a certain height of the liquid column, the float 2 begins to float. Under the action of Archimedean force. In that

0 moment, the permanently closed contact 12 opens and the control panel receives a signal about the danger of overfilling the tank with liquefied gas,

If the operator did not respond to the signal, the increase in the level of liquefied gas occurs until the contacts 11 are closed, which give a signal to turn off the electric motor.

To ensure operability

0 relays from oiler 13 periodically supply oil in the form of a film reaching ring 5. In the process of movement of piston 3, this oil spreads over the entire friction surface.

5 Since there is equal pressure on the inner and outer walls of the float 2, it can be made of light metal - aluminum, etc., while maintaining the required lifting force, determined by the value

0 gas bubble. To reduce the impact load, gaskets 9, 10 were used, in which openings were made to gradually fill the internal cavity. The interaction of the float 2 and the pin 5 of the screw 3 is carried out due to the rigid connection. The lifting force can be controlled by loading the piston 3. on a bench using compressed air pressure to simulate the vapor phase.

Among the advantages of the device are the absence of a weld on Alavka 2, through which the vapor phase could condense, condensing in the form of liquefied gas and depriving the float of lifting force. Using open

bottom of the float allows to reduce the dimensions of the device. Upon lowering the level, the float 2 returns to its original position, and the closure of the contact 12 confirms its readiness for operation.

Claims (1)

SUMMARY OF THE INVENTION A level float switch comprising a chamber made of diamagnetic material, in which a float with a magnet is located, and two magnetically controlled contacts mounted on the housing, characterized in that that, in order to increase the "reliability", the pop-in ok is made in the form of k-o to & and. :, “Ј $ shvf 3D part of which is connected to the piston with a magnet located on it, fixed between the sealing elements, while the first magnetically controlled contact is made normally closed, and the second is normally (open), and the flanges of the housing are perforated with rubber T1rk ad.