RU2457383C1 - Normally open electromagnetic shutoff valve - Google Patents

Abstract

FIELD: instrument making.

SUBSTANCE: normally open electromagnetic shutoff valve includes body with inlet and outlet channels. Seat is provided inside the body for gate valve. Pilot valve is located in the gate valve. Stock is connected to pilot valve and interacts with electromagnet armature through stop and spring. In addition, valve includes guide sleeve which is connected to the body. Shell in which valve control assembly is located is installed on electromagnet flange. Magnetic conductor of electromagnet is located on guide sleeve. Electromagnet armature is located in guide sleeve. Compression spring is installed with possibility of counter-action to movement of stock in valve closing direction.

EFFECT: improving operating reliability and functional capabilities of valve.

3 cl, 4 dwg

Description

The invention relates to automatic valves with remote control. Normally open electromagnetic shut-off valve (hereinafter referred to as the valve) is designed to automatically shut off gaseous media flows on gas pipelines of gas distribution and gas consumption systems of natural gas. The valve can be used in the automatic gas equipment block and serves to ensure safety during the ignition of gas burners and their subsequent operation.

Known high-speed solenoid valves of the normally open type with a locking element (shutter), which are mainly used as a protective device that provides the opening for the working environment of the safety pipeline in the event of a voltage outage in the electrical valve control circuit, including unauthorized, as well as preventing the occurrence of emergency situation.

Known normally open solenoid valve (patent application RU 2009118922 A, class F16K 31/02, publ. 11/27/2010), comprising a housing with a flow part, a shutter, an electromagnetic actuator, a separation tube, in the lower part of which there is a seat , a core to which a bolt is attached through a rod, a return spring located in the core. The disadvantage is the need to use a high power magnet. With an increase in the flow area of the valve, the power required for installing the valve in the closed position increases. With increasing power, the mass and, accordingly, the working temperature of the electromagnetic drive increases, which leads to a decrease in valve reliability. In addition, in the well-known normally open solenoid valve, in order to ensure tightness between the inlet and outlet nozzles, in addition to the seal in the seat, an additional seal is installed between the housing and the valve. The additional seal installed in the housing, due to the reciprocating movement of the shutter, undergoes intensive wear, and therefore, the tightness is violated, which reduces the reliability of the known design and the service life.

To create a shut-off valve design that is economical to operate, when used in high pressure systems, valves with axial forces are used. For this purpose, in addition to the main locking element, a pilot valve with a reduced area 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 pilot valve 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 electromagnetic valve (patent for utility model RU 77658 U1, class F16K 31/02, published on October 27, 2008), adopted as a prototype. The known electromagnetic valve is normally open and contains a housing in the cavity of which a seat is made, an electromagnet located on the housing, a shutter located in the housing, a pilot valve located in the internal cavity of the shutter, a return spring located between the housing and the shutter, and an additional return spring located between the valve and the pilot valve, a rod connected to the pilot valve and interacting with the armature through the stop and spring. To close the shutter in a known valve, the moving armature must overcome the force of two return springs, which reduces the reliability of the valve.

It is known that to close the shut-off electromagnetic normally open valve (short-term operation), a current significantly exceeding the current required to hold the valve (continuous operation) is required. In known valves there are no means to change the current supplied to the electromagnet. Therefore, when the valves operate in the closing and holding mode, the current required for closing 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.

In addition, in the known electromagnetic valves there are no shutter position sensors, which reduces the usability and narrows the scope of the valve.

The problem to which the invention is directed is to reduce the energy consumption consumed by the electromagnet, increase the reliability and consumer properties of the valve, and provide information about the shutter position.

The technical result is achieved by the fact that the normally-open electromagnetic shut-off valve comprises a housing with inlet and outlet channels, in which a shutter seat is made, a shutter located in the shutter, a pilot valve located in the shutter, a guide sleeve connected to the shutter, an electromagnet whose magnetic circuit is located on the guide sleeve, a glass with a cover located on the upper flange of the electromagnet, a valve control unit located in the glass, a stem connected to the pilot valve and inter vuyuschy through the armature of the electromagnet and a spring abutment, a compression spring mounted for counteracting rod movement in the valve closing direction, wherein the armature of the electromagnet is located in the guide sleeve. The valve contains an inductive shutter position sensor. The shutter and pilot valve have o-rings.

The invention is illustrated by drawings, where:

Figure 1 - valve in the open position with the location of the inductive sensor in the end wall of the housing.

Figure 2 - valve in the "closed" position.

Figure 3 and Figure 4 - valve with the location of the inductive sensor in the side wall of the housing.

The normally open solenoid valve contains the following elements:

1 - housing;

2 - inductive sensor;

3 - shutter seat;

4 - guide sleeve;

5 - shutter;

6 - pilot valve;

7 - stock;

8 - pin;

9 - anchor;

10 - emphasis;

11 - spring stop;

12 - pole;

13 - a lock ring;

14 - seat of the pilot valve;

15 - the first plate;

16 - split ring;

17 - the second plate;

18 - compression spring;

19 - a stub;

20 - a lock ring;

21 - through holes in the shutter;

22 - holes in the pilot valve;

23 - rings;

24 - magnetic circuit;

25 - coil of an electromagnet;

26 - lower flange;

27 - upper flange;

28 - a glass;

29 - valve control unit;

30 - cover;

31 - a lock ring;

32 - a stub;

33 - a sealing ring of the pilot valve;

34 - a sealing ring of a lock.

The valve comprises a passage-type housing 1, an electromagnet mounted on the end surface of the housing 1, and an inductive closed position sensor 2. The housing has an inlet and outlet nozzles. Inside the housing there is a seat 3 for the shutter. The housing 1 is connected to the guide sleeve 4 by a thread through an o-ring. The internal cavity of the housing 1 and the internal cavity of the guide sleeve 4 form a closed cavity for the passage of the working medium. Inside the housing there is a shutter 5, designed to close the passage in the saddle 3 of the shutter. In the shutter 5 there is an internal cavity in which the pilot valve 6 is located. The pilot valve 6 is connected to the stem 7 by a pin 8 located in the holes of the pilot valve and the stem, with a part of the stem located in the inner cavity of the pilot valve. The rod 7 interacts with the armature 9 of the electromagnet installed in the inner cavity of the guide sleeve 4, through the stop 10, rigidly connected to the armature 9, and through the spring 11 of the stop. The spring 11 of the stop allows the rod 7 to perform axial movement relative to the armature 9. In the inner cavity of the guide sleeve 4 there is a pole 12 of an electromagnet having the form of a tube, in the inner cavity of which is located the rod 7. Pole 12 is fixed from axial movement by the locking ring. The movement of the pilot valve 6 in the cavity of the shutter 5 is limited by the locking ring 13 and the seat 14 of the pilot valve, which can be performed as a separate part installed in the end face of the shutter 5. The movement of the shutter 5 in the housing 1 is limited to the first plate 15 with a central hole and a valve seat 3. A second plate 17 is fixed on the stem with a split ring 16. A compression spring 18 is located between the two plates. The inner space of the guide sleeve 4 is muffled by a plug 19, the movement of which is fixed by a locking ring 20. An electromagnet anchor 9, an emphasis 10, which is rigidly fixed to the anchor, an emphasis spring 11, the rod 7, the pole 12 and the compression spring 18 are located on the same axis. In the cylindrical wall of the shutter 5, through holes 21 are made connecting the inner cavity of the housing and the inner cavity of the shutter. In the pilot valve 6, holes 22 are made connecting the internal cavity of the shutter with the internal cavity of the pilot valve. Between the housing 1 and the outer cylindrical surface of the shutter 5 mounted ring 23.

A sealing ring 34 is installed on the end surface of the shutter 5, and a sealing ring 33 is installed on the end surface of the pilot valve 6. The valve and pilot valve seats are in the form of annular protrusions. When the valve closes, the seats are pressed into the o-rings 33 and 34 of elastic material.

The electromagnet contains: an anchor 9, a pole 12, a magnetic circuit 24 located on the guide sleeve 4, an electromagnet coil 25, a lower flange 26 and an upper flange 27, which serve as the lower and upper poles, a glass 28 and a cover 30 screwed onto the glass. The cup 28 is located on the upper flange 27 and is secured against movement by the retaining ring 31. The valve control assembly 29 is located in the cup. The power to the valve control unit is supplied through a plug located in the glass wall.

At the end of the housing, opposite the end with the installed guide sleeve and the electromagnet (see figure 1 and figure 2), an inductive closed position sensor 2 is installed. The inductive sensor 2 can be located on the sides of the housing, perpendicular to the direction of flow (see figure 3 and figure 4). In this case, threaded holes are made in the housing, in one of which a plug 32 is installed, and in the other, an inductive sensor 2 for closing the valve. The inductive sensor 2 and the plug 32, for ease of use, can be rearranged. The electrical signal of the valve state is removed from the inductive sensor connector.

The operation of the valve is as follows.

The initial state of the valve is normally open. In this state, the electromagnet coil 25 and the valve control unit 29 are de-energized, the shutter 5 is open and held by the compression spring 18 in the open state. Pilot valve 6 is open and abuts against circlip 13. Anchor 9 abuts against plug 19. Inductive position sensor 2 is open (signal “open”).

In the "close" mode of the valve, a control signal is supplied to the valve control unit 29, and voltage is supplied from the magnet coil 25 to it. In this case, the anchor 9 moves in the direction of the “stop”. Anchor 9 acts on the rod 7 through the stop 10 and the spring 11 of the stop. The pilot valve 6 moves to the seat 14, and then acts on the shutter in the direction of its closure. Moreover, through the through holes 21 made in the wall of the shutter, the working medium enters from the cavity of the housing connected to the inlet pipe into the inner cavity of the shutter and through the openings 22 in the pilot valve enters the cavity above the shutter 5. This allows the shutter to be moved not only beyond due to the movement of the armature 9, but also due to the pressure of the working medium on the valve 5. When the valve 5 blocks the passage in the seat 3, the inductive sensor 2 is activated. When the valve moves in the closing direction, the compression spring 18 is compressed, which counteracts the movement rod 7, and the distance between the pole 12 and the anchor 9 is reduced and the armature 9 sits on a "stop" pole 12. In the "close valve" to the coil is energized sufficient to close the valve. This mode lasts no more than 4 s. After that, the valve control unit 29 reduces the current on the coil by several times and the reduced current sufficient for the mode of "holding" the valve in the closed state is supplied to the coil all the time until the valve is opened. The use of the valve control unit 29 can reduce power consumption during operation of a normally-open solenoid shutoff valve.

To open the valve, the power to the valve control unit 29 is turned off. The compression spring 18, mounted on the rod 7, carries the rod along with it, thereby moving the core 9 and opening the pilot valve 6. The pressures in the cavities of the inlet and outlet nozzles are equalized. This allows the compression spring 18 to open the valve shutter.

Claims (3)

1. The electromagnetic shut-off valve is normally open, comprising a housing with inlet and outlet channels, in which a valve seat is made, a valve located in the housing, a pilot valve located in the valve, a compression spring, an electromagnet, a rod connected to the pilot valve and interacting with the armature an electromagnet through an emphasis and a spring, characterized in that it further comprises a guide sleeve connected to the housing, a glass with a lid located on the upper flange of the electromagnet, and a valve control assembly laid in the glass, while the magnet of the electromagnet is located on the guide sleeve, the anchor of the electromagnet is located in the guide sleeve, and the compression spring is installed to counter the movement of the rod in the direction of closing the valve. 2. The valve according to claim 1, characterized in that it comprises an inductive shutter position sensor. 3. The valve according to claim 1, characterized in that the shutter and pilot valve have o-rings.

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