SU585408A1 - Liquid level transmitter - Google Patents

Description

(54) LIQUID LEVEL SIGNALIZER

one

The invention relates to the field of instrumentation and can be used to signal the level of a liquid, in particular in transport vehicles having a container with a liquid.

Liquid level detectors are known, which contain magnetically controlled contacts with pole tips and floats with permanent magnets. Moreover, the external annular float is provided with the aid of the youngest self-orienting float, with a magnetic coupling interacting with the internal magnetic system formed by polar tips of the magnetically controlled contacts. The disadvantage of the signal of the level isolator is low reliability when used on transport vehicles with a low efficiency of magnetic self-orienting.

Of the known level detectors, the closest to the invention is a level detector containing magnetically controlled contacts and a non-magnetic housing placed in two cavities with a membrane with a float mounted in its middle part

A lump with a magnet, one and cavities is connected through a throttle opening with a controlled capacity, and magnetically controlled contacts 2 are installed outside the case. The disadvantage of such a warning device is low reliability of operation under the influence of vibration loads, as false alarms are possible due to filling the case of the alarm device with liquid fluid oscillations with a level below the axis of the throttle hole.

The purpose of the invention is to increase the reliability of operation when subjected to vibration loads.

This is achieved by the fact that in a known liquid level switch containing magnetically controlled contacts and a housing divided into two cavities by a membrane with a float with a magnet installed in its middle part, one of the cavities is connected through a throttle orifice with a controlled capacity, the throttle aperture is made in the form of an annular grooves in the bottom of the housing mated with an inclined channel in the wall of the housing.

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The drawing shows the design of the proposed device.

Alarm device; The liquid level contains a non-magnetic body 1 with a cover 2 and a bottom 3. The body is divided into two cavities by a membrane 4, on which it is fixed with a washer 5 made of a non-magnetic material permanent magnet 6 and a float 7 made of magnetically permeable material i. A cover device 8, made of a non-magnetic material with a spring 9, is mounted on the lid 2, on which a magnetically controlled contact is fixed.

10 normal fluid level. To the bottom

3 attached magnetic control contact

11minimum level of fluid - closed by the skin 12. The cavity above the membrane is connected through channel 13 with a controlled capacity of 14, and the cavity under the membrane is connected to the controlled capacity through an orifice 15, made in the form of a tsoltsevaya groove 15 in the bottom 3 of housing 1, matched with an inclined channel 16 in the wall of the housing.

The liquid level indicator works as follows.

: - At a normal level of fluid in e-bone 14, membrane 4 is in equilibrium under the action of forces: on one side of the spring 9 and the weight of the magnet 6, on the other hand - under the action of the buoyancy force of the float 7 immersed in the fluid that entered the cavity under the membrane from the tank 14 on the inclined

channel 16 and the annular groove 15. In this case, the position of the magnetically controlled contact 1O is adjusted by means of the control device 8 so that its contacts under the action of magnetic forces

the magnet 6 is closed, for example, a green light bulb, & normal fluid level. If the level falls below the minimum, liquid from the cavity under the membrane 4 will flow out over the annular

the groove 15 and the inclined channel 16 into the container 14, as a result of which the buoyant force from the float 7 to the membrane 4 will be zero and under the action of the spring 9 and the weight of the magnet 6 will occupy the lowest

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position, In this case, the contacts of the magnetically controlled contact 10 are open and the contacts of the magnetic control contact 11 are closed, signaled, for example, by a red light, about a minimum level of liquid.

The supply of liquid from the controlled tank to the liquid level detector through an inclined channel in the housing wall, coupled with an annular groove in the bottom of the tank, improves the reliability of the device when subjected to vibration loads, since when the mass of the fluid in the controlled tank varies, - horizontal plane, the inclined channel prevents the penetration of fluid into the body of the detector from the horizontal component of the oscillation, and the annular groove from the vertical one. Thus, there is no information about the level of the liquid below the minimum and only with prolonged action of the mass of the liquid in the controlled container, which is possible at the level of the minimum and the highest liquid through the inclined channel and the annular groove flows into the lower cavity of the detector.

Claims (2)

1. USSR author's certificate number 434272, cl. Q 01 I 23/12, 1972. 2. The patent of the Federal Republic of Germany No. 1.640.375, cl. 21 s, 4O / O4, 1972.