RU2625043C1 - Combined alarm pressure and temperature filter - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: filter indicator contains a housing with a cylindrical chamber equipped with a spring-loaded cylindrical piston separating the chamber into two cavities and a magnet attached to the piston. In the case on the magnet side there are stationary and movable pressure differential signalling contacts, the movable contact being made magnetically controlled. The first chamber cavity is configured to be connected to the filter inlet, the second cavity on the side of the spring is configured to be connected to the filter outlet. The magnet is fixed on the opposite end of the piston from the spring. In the body, a second chamber is provided, provided with a membrane separating the second chamber into two cavities. The first cavity of the second chamber is configured to be connected to the filter inlet, and in the second chamber of the second chamber, there are fixed and movable signalling contacts of the inlet pressure, the movable contact being connected to the membrane. A thermistor is equipped with temperature alarm contacts is fixed in the housing.

EFFECT: expansion of the functionality of the filter indicator.

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Description

The invention relates to mechanical engineering, in particular to engine building, and can be used to signal an increase in the hydraulic resistance of the fuel filter to a predetermined critical value, which serves as a criterion for replacing or cleaning it, as well as a pressure drop at the inlet of the filter and excessive heating of the fuel.

A known filter clogging indicator comprising a housing in which a spring-loaded piston is placed, which moves under the influence of a differential pressure of liquid at the inlet and outlet of the filter (see copyright certificate SU 477326, IPC G01L 19/12, G08B 21/00, publ. 15.07.1975 ) The signaling device has an indicator in the form of an electric contact sensor connected to the supra-piston cavity under pressure of the purified liquid. The piston below is under pressure from the crude liquid. The cylindrical surface of the piston has an annular groove that connects when the pressure of the purified liquid drops to the drain. The signal to the lamp is given during a critical pressure drop on the cleaned liquid from the electrical sensor.

The disadvantage of such a signaling device is its susceptibility to vibration and shock, low reliability, and a spread in pressure drops at which the signaling device is triggered.

A known filter detector comprising a housing divided into two cavities by a sensing element in the form of a membrane of elastic material with a magnet, while one cavity is connected by a channel to the filter inlet and the other with an outlet (see copyright certificate SU 1053855, IPC B01D 35/14, publ. 11/15/1983). The signaling device contains a magnetically controlled contact, the housing is equipped with a partition with an opening, an annular protrusion is made along the edges, and the magnet is equipped with a rod placed in the opening of the partition.

The disadvantage of the signaling device is the design complexity, susceptibility to shock and vibration, low reliability due to the use of a membrane of elastic material.

Closest to the claimed device is a filter clogging indicator comprising a housing with a cylindrical chamber provided with a spring-loaded cylindrical piston dividing the chamber into two cavities and a magnet attached to the piston end face (see copyright certificate SU 398850, IPC G01L 19/12, publ. 09/27/1973). A magnetically controlled contact is fixed to the housing on the magnet side, the cavity of the chamber on the side of the spring is configured to connect to the output of the filter, and the other cavity is configured to connect to the input of the filter.

The disadvantage of the detector is the design complexity, susceptibility to vibration and shock, poor resistance to external magnetic fields, the variation in pressure drops at which the detector is triggered.

The task of the invention is to provide simultaneous control of the limiting values of three quantities: the maximum pressure drop of the working fluid on the filter, the minimum pressure of the working fluid at the inlet of the filter and the temperature of the working fluid.

The technical result consists in expanding the functionality of the filter alarm.

The specified technical result is achieved in that the filter warning device comprises a housing with a cylindrical chamber equipped with a spring-loaded cylindrical piston dividing the chamber into two cavities and a magnet attached to the piston; in the housing on the magnet side there are fixed and movable differential pressure alarm contacts, and movable the contact is made magnetically controlled, the first cavity of the chamber is configured to connect to the input of the filter, the second cavity from the side of the spring is configured to of the connections to the filter output, according to the inventive solution of the magnet fixed on the opposite end from the spring piston; a second chamber is provided in the housing, provided with a membrane dividing the second chamber into two cavities, the first cavity of the second chamber is configured to be connected to the filter inlet, and in the second cavity of the second chamber there is a fixed and movable pressure alarm signal at the inlet, and the movable contact is connected to a membrane; a thermistor is mounted in the housing, equipped with temperature alarm contacts.

The invention is illustrated in the drawing. The positions in the drawing indicate:

1 - housing;

2 - a cylindrical chamber;

3 - sleeve;

4 - the piston;

5 - magnet;

6 - sealing cuff;

7 - anchor with a movable contact;

8 - bottom plate with fixed contact;

9 - spring;

10- membrane with a movable contact;

11 - top plate with a fixed contact;

12 - a casing;

13 - fork;

14 - thermistor sleeve;

15 - thermistor;

16 - lower static cavity;

17 - lower dynamic cavity;

18 - the partition of the housing;

19 - a partition;

20 - upper static cavity;

21 - upper dynamic cavity;

22 - an insulator;

23 - a tube;

24 - pressure feed channel P1;

25 - channel supply pressure P2;

A - fixed contact signaling pressure inlet;

B is a movable contact of the inlet pressure alarm;

С - fixed contact of differential pressure alarm;

D - moving contact of the differential pressure alarm;

E is the first contact of the temperature alarm;

F is the second contact of the temperature alarm.

The combined pressure and temperature indicator of the fuel filter contains a housing 1 with a cylindrical chamber 2, inside which a cylindrical piston 4 is coaxially located, and in the gap between the piston and the cylinder wall there is a sealing sleeve 5 so that the piston 4 divides the internal volume of the chamber 2 into two cavities. The first cavity of the cylindrical chamber 2 is a lower dynamic cavity 17, made with the possibility of connection with the inlet of the filter using the channel 24 of the pressure P1, made in the housing 1. The second cavity of the cylindrical chamber 2 contains a compression spring 9, one end of which is in contact with the end face of the piston 4 , and a sleeve 3 located on the side of the other end of the spring with the possibility of changing position when assembling the signaling device to set the required pressure force of the spring on the piston. The second cavity of the cylindrical chamber 2, containing the spring 9, is made with the possibility of connection with the output of the filter using the channel 25 of the pressure P2. The detector contains a magnet 5, mounted on the end of the piston 4 opposite from the spring 9, as well as a thermistor 15, mounted in the housing 1 using a sealant and a thermistor sleeve 14 and provided with two temperature signaling contacts E and F, while channel 25 is made in the housing 1 and in sleeve 14.

In the housing 1, a lower static cavity 16 is made, separated from the lower dynamic cavity 17 by a partition of the housing 18. Inside the cavity 16, in the housing 1 there is a lower plate 8 with a fixed differential pressure alarm contact C and an armature 7 with a differential pressure alarm contact D with the ability to control the magnetic field of a magnet 5 located in the lower dynamic cavity 17.

A second chamber is made in the housing 1, bounded by a casing 12 and separated from the lower static cavity 16 by a partition 19, while a membrane 10 is fixed inside the second chamber, dividing the internal volume of the second chamber into two cavities. The first cavity of the second chamber forms the upper dynamic cavity 21, made with the possibility of connection with the input of the filter using the tube 23 and the channel 24 of the pressure P1. The second cavity of the second chamber forms the upper static cavity 20, inside of which on the insulators 22 there is an upper plate 11 with a fixed inlet pressure signal A and an inlet pressure signal B connected to the membrane 10.

Contacts A, B, C, D, E, F are output to plug 13 for easy connection to an electrical circuit.

The inventive device operates as follows.

Channel 24 is supplied with pressure P1 from the filter inlet, and channel 25 is supplied with pressure P2 from the filter outlet.

If there is a nominal pressure P1 of the flow of the working fluid, the membrane 10 moves upward under the action of the incoming pressure, closing the movable contact B with the fixed contact A, while on the plug 13 during operation of the signaling device, a signal is detected indicating the presence of the nominal overpressure of the working fluid at the filter inlet.

When the pressure P1 of the working fluid decreases at the inlet of the filter and, accordingly, in the channel 24 and the upper dynamic cavity 21, the membrane 10 moves downward, and when the excess pressure level P1 is below the minimum acceptable value, the movable contact B opens with the stationary contact A, this on the plug 13 fix a signal about a decrease in pressure below an acceptable level.

If the filter is clean, then the pressure drop between P1 and P2 is minimal, the piston 4 with magnet 5 is supported by the spring in 9 in the upper position, while the armature 7 with the movable contact D is closed with the stationary contact C by the action of magnet 5, the corresponding signal is the normal pressure drop fixed on a fork 13.

When the filter is clogged, the pressure P1 increases in the channel 24 and the lower dynamic cavity 17, while the piston 4 with the magnet 5 fixed moves down, compressing the spring 9, the armature 7 with the movable contact D under the action of magnetic coupling with the magnet 5 after the piston moves down and opens the movable contact D with the fixed contact C, the corresponding signal about the clogging of the filter is fixed on the plug 13.

When replacing the filter, the pressure drop between P1 and P2 again becomes minimal, the piston 4 with magnet 5 returns to its original upper position, and the movable contact D closes with the fixed contact C.

The thermistor 15 provides control of the temperature of the working fluid, while the temperature is judged by the magnitude of the electrical resistance between the contacts E and F on the plug 13.

Claims (1)

The filter detector comprising a housing with a cylindrical chamber equipped with a spring-loaded cylindrical piston dividing the chamber into two cavities and a magnet attached to the piston, in the housing on the magnet side there are fixed and movable pressure difference alarm contacts, the movable contact being magnetically controlled, the first cavity the chamber is made with the possibility of connection with the input of the filter, the second cavity from the side of the spring is made with the possibility of connection with the output of the filter, characterized in that the rotor is fixed on the piston end opposite from the spring; a second chamber is provided in the housing, provided with a membrane dividing the second chamber into two cavities, the first cavity of the second chamber is configured to be connected to the input of the filter, and in the second cavity of the second chamber there are fixed and movable contacts of the pressure signal at the inlet, and the movable contact is connected to a membrane; a thermistor is mounted in the housing, equipped with temperature alarm contacts.

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