RU2491465C1 - Pressure difference indicator - Google Patents

Abstract

FIELD: measurement equipment.

SUBSTANCE: in a vessel of a pressure difference indicator there are insulated holes. In one of holes there is a spring-loaded magnetically operated sealed switch. In another hole there is a movable system with a permanent magnet. Specified holes are arranged in parallel. The movable system comprises a fixed bushing with a spring-loaded piston and a guide. The permanent magnet is fixed in the piston body perpendicularly to its axis in the plane stretching via the axis of the magnetically operated sealed switch and is spring-loaded.

EFFECT: simplified tuning of a pressure difference indicator providing for efficient usage of a filter.

2 cl, 2 dwg

Description

The invention relates to automatic signaling devices and may find application in stop valves for determining the time of timely cleaning of the filter.

Known extreme position indicator (SU 500407 A1, class F16K 37/00, 01/20/1976) containing a permanent magnet, the magnetic field of which acts on magnetically controlled contacts (reed switches). The disadvantage of this device is that the location of the mechanical and electrical units in the same cavity does not allow its use in hazardous areas.

A signaling device is known (SU 1373954 A1, class F16K 37/00, 02/15/1988), comprising a housing, a permanent magnet and a reed switch, a locking member and a hollow core composed of movable and fixed parts made of soft magnetic material. The reed switch is located in the cavity of the core parts and is enclosed in a pipe of non-magnetic material.

The disadvantage of this design is the inability to separately configure the mechanical and electrical parts, and their presence in a single cavity also does not allow it to be explosion-proof.

The closest known, by technical essence, is a signaling device (RU 54132 U1, class F16K 37/00, 10.06.2006), in the case of which there are insulated holes, one of which has a spring-loaded reed switch, and the second has a movable system with permanent magnet.

The disadvantages include the difficulty of setting up a mobile system.

The objective of this technical solution is to create a differential pressure indicator (DIR) at the inlet and outlet of the filter for its effective use. When the working medium passes through the filter, its passability decreases (its filter element becomes clogged). With decreasing filter throughput, the pressure difference at its inlet and outlet increases. When the pressure difference reaches a certain value, the IRD signals the need to clean the filter or replace it.

This technical result is achieved in that the holes are arranged in parallel. The movable system consists of a fixed sleeve with a spring-loaded piston and a guide, and a permanent magnet is fixed in the body of the piston perpendicular to its axis in the cavity passing through the axis of the reed switch and is spring-loaded. A spring is installed between the piston and the guide.

The claimed invention is "industrially useful", as evidenced by the following description with reference to the drawings, where:

figure 1 - shows the installation diagram of the IRD,

figure 2 - device IRD (section).

The differential pressure indicator (1) is connected to the inlet and outlet of the filter (2) installed in the pipeline (3) with a gaseous or liquid medium. The IRD housing (4) has insulated openings, in one of which a spring-loaded (5) reed switch (6) with output contacts (7) is placed. The reed switch is enclosed in a tube (8) of non-magnetic material. In another hole is a movable system with a permanent magnet, consisting of a stationary sleeve (9) with a spring-loaded (10) piston (11) and a guide (12). The force of the spring (10) of the piston (11) is selected taking into account its diameter and the pressure drop of the working medium on the filter (2). A permanent magnet (13) is fixed in the body of the piston (11) perpendicular to its axis in a plane passing through the axis of the reed switch (6) and spring-loaded (14). A ball (15) is installed between the piston (11) and the stationary sleeve (9), which interacts with the spring (14) of the permanent magnet (13), which makes it easy to install and replace the magnet (13). The fixed sleeve (9) is fixed between the input (16) and output (17) flanges. The tightness of the cavities on both sides of the piston (I) is ensured by seals (18). A spring (19) is installed on the guide (12) (there can be one or several symmetrically located relative to the axis of the piston), which allows to expand the adjustment range of the differential pressure of the working medium on the filter (its degree of operability).

The position of the reed switch (6) relative to the permanent magnet (13) is regulated by the sleeve (20) and counter-nut (21). The tightness of the reed switch cavity (6) is provided by the sleeve (22).

The differential pressure indicator works as follows. With increasing pressure difference at the inlet and outlet of the filter (2), the piston (11) with the magnet (13) begins to move towards the contacts of the reed switch (6). When the specified pressure difference is reached, the magnet (13) enters the contact zone of the reed switch electrodes (6) and the magnetic flux of the permanent magnet (13) causes the reed switch (b) to trigger the need to clean or replace the filter (2).

Claims (2)

1. Pressure differential indicator, in the case of which there are isolated openings, in one of which a spring-mounted reed switch is installed, and in the second - a movable system with a permanent magnet, characterized in that the openings are parallel, the movable system consists of a fixed sleeve with a spring-loaded piston and a guide and a permanent magnet is fixed in the piston body perpendicular to its axis in the plane passing through the axis of the reed switch and is spring-loaded. 2. The pressure difference indicator according to claim 1, characterized in that a spring is installed between the piston and the guide, or several, symmetrically located relative to the axis of the piston.

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