SU1723443A1 - Discharge signalling device - Google Patents

Abstract

The invention relates to technical physics, more precisely to devices for measuring the volume, volumetric or mass flow rate of a liquid, and allows increasing 1/58, reliability by eliminating jamming of the moving magnet of the flow indicator. The fluid flow through the inlet 10 and the filter 2 enters the stationary magnet 9. Passing through the holes in the magnet 9 and the plate 8, the fluid flow acts on the movable magnet 7, and then through the holes formed by the magnet 7 and the longitudinal grooves 11 in the housing 1, and the holes in the plate 6 are removed from the working chamber 4 of the detector. At a given amount of fluid flow, the magnitude of the hydraulic pressure acting on the magnet 7 will exceed the force of attraction of the magnets 7 and 9 between them and the magnet 7 will move along the axis of the chamber 4. As a result, under the action of the magnetic field of the magnet 7, the hermetic magnetically controlled contact 3 will close 3 il.

Description

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The invention relates to physics, more specifically, to devices for measuring volume, volume flow, mass flow or liquid level, to electromagnetic meters, and can be used as a flow indicator in hydraulic systems to automatically control the presence or reduction of fluid flow and signal to the control unit hydraulic system.

A maximal accelerometer, made in the form of a rotating disk made of magnetic material, is known; a microswitch is installed in the lower part of the body; its button protrudes from the side surface into the internal cavity of the body, and an additional locking magnet is located at the base of the latter, with the base connecting the internal a cavity with an outer space, in the inner. cavity is placed a metal ball.

The disadvantage of this accelerometer is that it can only be used and works when there is increased vibration and is not suitable as a liquid flow indicator, as the metal ball is attracted to the disk magnet by the influx of liquid and remains in the same position as when there is a liquid flow , and in his absence, there is no sign of his absence. As a rule, the flow alarm device operates in the automatic mode, signaling about the presence or absence of the flow, and the specified device does not have this property.

A flow control relay is known, comprising a housing with inlet and outlet channels and with inlet and outlet openings communicating respectively with the inlet and outlet channels, consisting of a lower and an upper part forming a closed chamber divided into two parts, a membrane with a hard center and variable adjustable throttle, mounting sleeve with socket and collar, pressure ring, sealing element, spring and signaling device.

A disadvantage of this device is the low reliability due to the complexity of the device design, which does not allow the membrane tension to be preadjusted, taking into account the actual parameters of the spring and membrane, which affects the likelihood of failure and unstable relay operation.

The closest in technical essence and purpose is a flow rate detector, containing a non-ferromagnetic housing with a working chamber equipped with channels for the flow of the controlled medium, a filter, a perforated plate, the first permanent magnet, the second permanent magnet are installed in the working chamber sealed magnetic contact, with the first magnet mounted to move along the axis of the working chamber, facing the same magnet to the second magnet, rigid

fixed in the working chamber, the first movable magnet being magnetically connected with the second magnet and the hermetically sealed magnetically controlled contact.

The location of the magnets with like poles towards each other causes them to repel under the influence of magnetic fields arising around each pole and at the same time the opposite pole of the moving magnet tends to

In the first magnet, torques appear that jam the movable magnet in the working chamber, which increases the probability of the detector to malfunction and reduces its reliability.

The purpose of the invention is to increase reliability by reducing the likelihood of a second permanent magnet jamming.

This goal is achieved by the fact that the flow indicator, comprising a housing

from a non-ferromagnetic material, a working chamber made in a housing and provided with inlet and outlet nozzles, a first permanent magnet, a filter and a board with openings rigidly fixed in the chamber, a second permanent magnet mounted for movement along the axis of the chamber, hermetically magnetically controlled contact mounted on the surface of the housing above the movement area

the second magnet, the magnetization axes of the magnets are located along the axis of the chamber, on the walls of which longitudinal channels are made, the filter is installed on the side of the second nozzle, and the plate with holes and the second permanent magnet are arranged in series along the flow, a second plate with holes is inserted, rigidly fixed the sides of the outlet pipe, the first permanent magnet is placed between the filter and the first plate with holes, and the permanent magnets face each other with opposite poles.

FIG. 1 shows a longitudinal section of the flow detector; in fig. 2, section A-A in FIG. one; in fig. 3 is a view B in FIG. one.

The flow detector includes a housing 1, a filter 2, a sealed magnetically controlled contact 3, a working chamber 4, an outlet nipple 5, a plate with holes 6, a movable magnet 7, a plate with holes 8, a permanent magnet 9, an outlet nipple 10.

The elements 2.9, 8.7, 6 are arranged in series in the housing 1, which starts from the inlet 10. The filter 2, the magnet 9 and the plate with holes b are rigidly connected to the working chamber, in which longitudinal grooves 11 are made for the flow of fluid. In magnet 9, in plates with holes b and 8 holes are also made for the flow of liquid. Magnets 7 and 9 are turned towards each other by opposite poles. The magnet 7 is installed in the working chamber 4 with the ability to move along its longitudinal axis.

The flow indicator works as follows.

In the absence of a flux, the magnet 7 is attracted to the magnet 9, pressed against the board 8, the contacts 3 are open. When flow is supplied through the inlet 10, the filter 2 filters all solid particles from the flow, the magnet 9 passes its flow through its holes to the board 8, which passes the flow to the magnet 7 through its holes. Under the pressure of the flow force, the magnet 7 is pressed from the board 8, the flow passes further into the chamber 4. Through the holes 11, the stream is washed by the magnet 7, is led out of the working chamber 4 through the holes in the plate 6 and the outlet nozzle 5. The permanent magnet 7 occupies the working position determined by balancing the magnetic and hydraulic x forces Hermetically magnetically operated contact 3 is closed under the influence of a magnetic field of the displaced magnet 7. At the same time, the hermetic magnetically controlled contact 3 is set relative to magnet 7 so that, at a given controlled flow, it closes, indicating the presence of a predetermined flow.

When the controlled flow decreases below a predetermined value, the magnet 7 is attracted by the magnet 9 and it moves towards the board with holes 8, with increasing distance between the magnet 7 and the contacts 3, the influence of the magnetic field weakens and the contacts 3 open. interrupt the signal circuit. A plate with holes b also allows this type of device operation when a permanent magnet, under the action of a flux, occupies a non-intermediate position in

the working chamber 4. and the outermost one is pressed against the board 6.

The maximum distance, g, between the magnets, at which they will still be attracted to each other in the event of a liquid supply failure, is determined from the expression:

g V 8 K Mi M2

Cr-Vs

d2jr

where Cr is the drag coefficient of the moving magnet;

p is the density of the liquid;

V is the fluid flow rate;

d is the diameter of the rolling magnet;

K - proportionality factor;

Mi, 2 - the number of magnetism at one pole;

The use of the proposed flow detector provides, in comparison with the existing elimination of the torsional moment, and the wedging of the moving magnet in the working chamber, observed when the poles of two magnets are of the same name, also increases reliability by installing a stationary magnet in the flow direction that delays unfiltered ferromagnetic particles, impeding their penetration into the working chamber and increase in the friction force of the movable magnet against the walls of the working chamber; eliminates the time spent on disassembling and assembling the device during jamming; saves material resources by increasing the reliability that would be needed to restore the system, which includes a flow alarm.

Claims (1)

Invention Formula A flow detector, comprising a housing made of non-ferromagnetic material, a working chamber made in the housing and provided with inlet and outlet nozzles, a first permanent magnet, a filter and a plate with holes rigidly fixed in the chamber, a second permanent magnet mounted for movement along the axis of the chamber , a sealed magnetic contact mounted on the surface of the housing above the second magnet moving section, the magnetization axes of the magnets are located along the axis of the chamber, on the walls of which the longitudinal channels, the filter is installed at the inlet side, and the plate with holes and the second permanent magnet are arranged sequentially downstream; characterized in that, in order to increase reliability by reducing the likelihood of a second permanent magnet jamming, a second plate with holes is inserted in it, rigidly fixed on the side of the outlet nozzle, the first permanent magnet is placed between the filter and the first plate with holes, and permanent magnets face each other with opposite poles. Aa