RU2498138C1 - Normally open electromagnetic shutoff valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: normally open electromagnetic shutoff valve comprises a body with input and output cavities and a seat for a trim, an electromagnet and a cover fixed at the body bases, a trim with a seat for a spool, a spool, first, second and third springs. Stem is located along the trim seat passage axis. The valve is additionally fitted by a valve control unit and a pipe sleeve connected to the trim. The trim is situated in the cavity formed by the body and the cover. The spool is situated in the cavity formed by the trim and the pipe sleeve. Electromagnet armature and the first spring are situated in the electromagnet core. The first spring is placed between the armature face surfaces and the electromagnet core. The second spring is placed between the trim and the cover. The third spring is placed between the spool and the pipe sleeve. The stem is connected to the electromagnet core and can affect the spool.

EFFECT: providing for reliable valve design and reduction of electric energy consumption required for electromagnet.

4 cl, 1 dwg

Description

The invention relates to automatic valves with remote control. The proposed valve relates to high-speed solenoid valves of a normally open type with a locking element (shutter). Normally open electromagnetic shut-off valve (hereinafter referred to as the valve) is designed to automatically shut off gaseous working fluid flows on gas pipelines of gas distribution, gas supply and gas consumption systems of natural gas. The valve can be used as a protective device in the automatic gas equipment unit, designed to operate a group of gas burners. In this case, the valve ensures that the safety pipeline opens for the working medium in case of violation of the technological parameters of the burner or in the event of a voltage outage in the electrical valve control circuit, including unauthorized ones.

To reduce the consumption of electric energy consumed by the electromagnet, valves with axial force unloading are used. For this purpose, in addition to the main locking element, a valve with a reduced area not unloaded from pressure is used in the valve design. When a command is issued to open the valve, the power to the coil is stopped, and the valve is opened by a compression spring. The force required to open the spool is determined by its size and pressure of the working medium. This allows you to use a compression spring with reduced power characteristics, and this in turn allows you to reduce the current consumption when closing the valve when the compression spring is compressed. Such valves include the well-known solenoid valve (patent for utility model RU 77658 U1, class F16K 31/02, publ. 10/27/2008). Known solenoid valve is normally open and contains a housing with inlet and outlet cavities and with a seat for the shutter. A shutter with a seat for the spool is located in the housing. Through channels are made through the channels. A spool is located in the inner cavity of the shutter. The first return spring is located between the housing and the bolt. A second return spring is located between the spool and the valve. A third compensating spring is installed between the spool and the armature of the electromagnet.

As a prototype, a valve with an electromagnetic actuator was adopted (patent for utility model RU 103161 U1, class F16K 31/00, published March 27, 2011), since it has a set of features that is closest to the set of essential features of the invention. Known solenoid valve is normally open and contains a housing with inlet and outlet cavities and with a seat for the shutter. The shutter is connected to the stem. The stem is located along the axis of the passage in the valve seat. At one of the ends of the body is a glass on which an electromagnet is located. On the other end of the housing is fixed cover. A shutter position sensor is located in the cavity formed by the housing and the cover. The valve comprises a spool arranged to close a hole made in the valve. The first spring is located between the housing and the bolt. The second spring is located between the valve and the valve. The third compensating spring is located in the cavity of the spool and is located between the end of the spool and the armature of the electromagnet.

It is known that to close the shut-off electromagnetic normally-open valve (short-term operation - not more than 4 seconds), a current significantly exceeding the current required to hold the valve (continuous operation) is required. The duration of the “hold” mode can be 12 months or more - until the valve is serviced. In known valves there are no means to change the current supplied to the electromagnet. Therefore, in the “hold” mode, the current required for the “close” mode is supplied to the electromagnet. This leads to heating of the coil and, consequently, to a decrease in the service life of the electromagnet, as well as to excessive consumption of electricity.

The problem to which the invention is directed, is to reduce the consumption of electricity consumed by the electromagnet, increase the reliability, service life and consumer properties of the valve.

The technical result is achieved by the fact that the normally open electromagnetic shut-off valve comprises a housing with an inlet and outlet cavities and with a valve seat, an electromagnet and a cover fixed to the housing bases, a valve with a valve seat, located in the cavity formed by the body and the cover, a valve a fitting rigidly connected to the valve, the first, second and third spring, a rod located along the axis of passage of the valve seat and the valve control unit, while the valve is located in the cavity formed by the valve and the item ohm, the magnet of the electromagnet and the first spring are located in the core of the electromagnet, the first spring is located between the end surfaces of the armature and the core of the electromagnet, the second spring is located between the valve and the cover, the third spring is located between the spool and the fitting, and the rod is rigidly connected to the anchor, it can act on the spool. The valve control unit is located between the valve power supply and the electromagnetic coil of the electromagnet and has the ability to change the amount of current consumed by the valve. The valve may comprise an inductive shutter position sensor located in the valve cover.

The drawing shows a shut-off solenoid valve normally open.

The normally open solenoid valve contains the following elements:

1 - housing;

2 - cover;

3 - core;

4 - electromagnetic coil;

5 - anchor;

6 - the first spring;

7 - shutter;

8 - the second spring;

9 - spool;

10 - fitting;

11 - the third spring;

12 - stock;

13 - shutter position sensor;

14 - valve control unit.

In the valve body 1, the inlet and outlet cavities and a valve seat are made. On the side surface of the body are rigidly mounted fittings for connection to the gas pipeline. An electromagnet is mounted on one of the bases of the case. A cover 2 is fixed on the opposite base of the housing.

The core 3 of the electromagnet has the form of a glass. An electromagnetic coil 4 is located on the core 4. An anchor 5 and a first spring 6 are located in the core. The first spring 6 is designed to return the valve structural elements to their original state. The first spring is located between the end surface of the armature 5 and the blind end of the core 3.

The cover 2 and the housing 1 form a cavity in which the shutter 7 is located with the possibility of reciprocating movement. The shutter, designed to block the passage in the saddle, is made with a diameter smaller than the diameter of the cavity in which it is located, therefore, between the side wall of the shutter and the inner the side wall of the cover has a gap. Through channels are made through the channels. Between the shutter and the cover there is a second spring 8. In the shutter cavity there is a spool 9, the movement of which in the shutter cavity is limited by the surface of the valve seat and the fitting 10, rigidly fixed with the shutter. A third spring 11 is installed between the spool and the nozzle 11. A thread is made on the side surface of the nozzle for connection with the valve, a hole is made in the base of the nozzle. The second 8 and third 11 compression springs are designed to keep the valve closed.

On the end surfaces of the shutter and spool, sealing rings of elastic material are installed. The valve and spool saddles are in the form of annular projections. When the valve closes, the valve seat is pressed into the valve o-ring and the valve seat is pressed into the valve o-ring.

One end of the rod 12 is rigidly connected to the armature 5 of the electromagnet. The other end of the rod 12 is able to act on the valve 9 and then on the shutter 7 in the process of "opening" the valve and in the initial open state of the valve. The electromagnet armature, stem and spool are located on the same axis.

To monitor the position of the shutter provides a non-contact inductive sensor 13 of the shutter position. The sensor (switch) 13 of the shutter position is located in the cover 2.

The valve comprises a valve control unit 14 (hereinafter “BEECH”) installed between the electromagnetic coil of the electromagnet and the valve power supply. BEECH is designed to change the amount of current consumed by the valve.

The operation of the valve is as follows.

The initial state of the valve is normally open. In this state, the electromagnet and the beech are de-energized. Under the action of the first spring 6, the electromagnet armature 5 acts on the spool 9 through the rod 12. The spool, in turn, acts on the fitting 10, which is rigidly fixed to the valve, moving the valve all the way into the cover 2. The second spring 8 and the third spring 11 are compressed. When the shutter is in its lowest position, the inductive sensor 13 signals the open position of the valve.

To close the valve, a control signal is supplied to the BUK 14, and voltage is supplied from it to the coil 4 of the electromagnet. In this case, the anchor 5 moves upward to the end of the core and compresses the first spring 6. The rod 12 rises with the anchor and stops pressing the spool 9 against the fitting 10. Under the action of the return forces of the second 8 and third 11 springs, the spool and shutter close the passages in their seats.

In the “valve closure” mode, sufficient current is supplied to the coil to close the valve. This mode is short-term and lasts no more than 4 s. After this, the BEECH reduces the current on the coil several times and the reduced current sufficient to keep the valve closed is supplied to the coil all the time until the valve opens. The use of beech can reduce energy consumption during operation of a normally-open solenoid valve.

To open the valve, the power to the BEECH is turned off, while the electromagnetic coil is de-energized. The first spring 6 is expanded and acts on the armature and valve stem. The passage in the valve seat made in the valve opens due to the action of the stem on the valve. The working medium enters from the inlet cavity of the housing into the inner cavity of the shutter through the through channels in the side wall of the shutter and then through the passage in the valve seat to the outlet cavity of the housing. The pressures in the input and output cavities of the housing are equalized. In this case, the pressure of the medium acts on the valve, due to which an excess force arises, which, together with the force of the first spring, “tears” the valve from the seat.

Claims (4)

1. The electromagnetic shut-off valve is normally open, comprising a housing with an input and output cavities and with a valve seat, an electromagnet and a cover fixed to the housing bases, a valve with a valve seat, a valve, first, second and third springs, a rod located along the axis the passage of the valve seat, characterized in that it is additionally equipped with a valve control unit and a fitting connected to the valve, the valve being located in the cavity formed by the housing and the cover, the spool is located in the cavity formed by the valve m and a fitting, the electromagnet armature and the first spring are located in the core of the electromagnet, with the first spring located between the end surfaces of the armature and the core of the electromagnet, the second spring is located between the valve and the cover, the third spring is located between the spool and the nozzle, and the rod connected to the electromagnet armature has the ability to act on the spool. 2. The electromagnetic shut-off valve normally open according to claim 1, characterized in that the valve control unit has the ability to change the amount of current consumed by the valve and is located between the valve power supply and the electromagnetic coil of the electromagnet. 3. The electromagnetic shut-off valve is normally open according to claim 1, characterized in that it comprises a shutter position sensor. 4. The electromagnetic shut-off valve is normally open according to claim 3, characterized in that the shutter position sensor is located in the cover.

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