RU137759U1 - AUTOMATIC BLOCK VALVE DRIVE - Google Patents

Abstract

1. The drive of an automatic shut-off valve, comprising a base, a support fixed to the base, a main lever and an auxiliary lever fixed to the support rotatably, an electromagnet and a limit switch unit rigidly fixed to one end of the main lever, and a latch rotatably fixed on the other end of the main lever, a latch pin fixed to the end of the auxiliary lever, a spring, an actuator and a magnetic actuator, while the actuator lever has the possibility the ability to act on the auxiliary lever, and the anchor of the electromagnet has the ability to act on the latch, characterized in that it additionally contains a forcing unit that forms the starting and holding currents of the electromagnet. 2. The automatic shut-off valve actuator according to claim 1, characterized in that the forcing unit is mounted on the electromagnet body. The automatic shut-off valve actuator according to claim 1, characterized in that the electromagnet armature is connected to the latch via an earring and a rod. The automatic shut-off valve actuator according to claim 3, characterized in that the spring is located on the stem.

Description

The proposed actuator is designed to control a safety automatic shut-off valve (PZKA), which provides technological protection, automated, remote control of gas supply to the burners of steam and hot water boilers.

Known electromechanical actuator safety shut-off valve (RU 2392524 C2), designed to work as part of a gas supply system. A known actuator is mounted on the valve body cover. Based on the drive, a support and an actuator are fixed. In the support, the main lever and the auxiliary lever are rotatably fixed. The auxiliary lever is the connecting link between the main lever and the actuator lever. The main lever is connected by the first earring to the valve stem. An electromagnet is attached to one end of the main lever. At the other end of the main lever, a latch with a socket is rotatably fixed. The locking pin is fixed to the end of the auxiliary lever. The latch using the second earring and rod is connected to the armature of the electromagnet. During the working stroke of the electromagnet, the latch rotates through an angle of 90 °. Reverse rotation of the lock is provided by a spring located on the rod.

It is known that in order to move the armature of an electromagnet used, for example, for the operation of the latch, it is necessary to supply a starting current (short-term operation) to the electromagnet, significantly exceeding the current required to hold the armature (continuous operation). 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 specified disadvantage is solved in similar valve actuators (RU 88758 U1 and RU 103882 U1). In known actuators, the mechanical part of the actuator is made similar to the valve actuator (RU 2392524 C2). An electromagnet is used to rotate the lock. And to hold the latch in the closed position, use an electromagnetic time switch introduced into the drive. In this case, the electromagnet is de-energized. Thus, the problem of reducing the energy consumed by the electromagnet and, therefore, increasing the reliability and service life of the electromagnet has been solved. In this case, the electromagnetic time switch also solves the problem of a short-term loss of power supply to the valve actuator, in which the electromagnetic time switch keeps the valve open for 0.6-0.8 s, which is typical for devices having coils. The disadvantages include the cumbersome design of the actuator, due to the presence of an electromagnetic time switch, which significantly reduces the consumer properties of the valve.

The task that the utility model is aimed at is to reduce the energy consumption consumed by the electromagnet, which reduces the heating of the electromagnet coil and, ultimately, leads to increased reliability and increased drive life.

The technical result is achieved by the fact that the automatic shut-off valve actuator comprises a base, a support fixed to the base, a main lever and an auxiliary lever fixed to the support rotatably, an electromagnet and a limit switch block rigidly fixed to one end of the main lever, and a latch fixed rotatable on the other end of the main lever, a latch pin fixed to the end of the auxiliary lever, a spring, an actuator, a magnetic starter and a boost unit Which forms the starting and the holding current of the electromagnet, the actuator arm is able to act on the secondary arm and the armature is able to act on the latch. The boost unit can be mounted on the body of the electromagnet. To influence the anchor of the electromagnet on the latch, they can be connected through the earring and rod. In this case, the spring will be located on the rod.

The design of the automatic shut-off valve actuator is illustrated by the following drawings, where:

figure 1 - valve assembly with actuator;

figure 2 - drive without casing;

figure 3 - section aa;

figure 4 is an electrical circuit diagram.

The valve, which is controlled by the inventive actuator, contains (figure 1): 1 - body; 2 - a plate; 3 - tip; 4 - valve stem; 5 - valve spring; 6 - a cover; 7 - sleeve; 8 - drive.

The valve comprises an angular type housing 1 with inlet and outlet nozzles. In the case, the plate 2 is located with the possibility of closing the passage in the saddle, connected through the tip 3 to the rod 4. The tip is designed to close the holes in the plate and serves as an auxiliary locking element of a reduced size, designed for unloading from axial forces. A valve spring 5 is located on the stem, abutting at one end to a guide sleeve located on the cover 6, and the other end to the sleeve 7, mounted on the stem with a split ring. The valve spring 5 is for closing the valve. The valve actuator 8 is located on the cover 6 of the housing and is connected to the valve stem 4.

The valve actuator contains (figure 2 and figure 3): 9 - base; 10 - support; 11 - actuator type MEO; 12 - magnetic starter; 13 - the main lever; 14 - auxiliary lever; 15 - the first earring; 16 - an electromagnet; 17 - block limit switches; 18 - a clamp; 19 - a finger of a clamp; 20 - the second earring; 21 - a stock; 22 - spring; 23 - lever actuator (lever MEO); 24 - the first finger; 25 - shaft block limit switches; 26 - the second finger; 27 - additional lever; 28 - force block; 29 - a plug with a socket.

Based on the drive 9, a support 10, an actuator 11 and a magnetic starter 12 are fixed. As an actuator 11, a single-turn electric mechanism (hereinafter referred to as MEO) is used. In the support 10, the main lever 13 and the auxiliary lever 14 are rotatably fixed. The levers 13 and 14 are fixed in the support 10 using an axis welded to the main lever 13. The main lever 13 in the middle part is connected by the first earring 15 to the valve stem 4. At one end of the main lever 13, an electromagnet 16 and a limit switch block 17 are rigidly fixed. At the other end of the main lever 13, a latch 18 with a socket is rotatably fixed. Finger 19 of the latch is rotatably fixed at one end of the auxiliary lever 14, free from mounting in the support 10. The latch 18 is connected to the armature of the electromagnet 16 using the second earring 20 and the rod 21. During the electromagnet 16, the latch 18 rotates 90 ° . The reverse rotation of the latch 18 is provided by a spring 22 located on the rod 21.

The auxiliary lever 14 is the connecting link between the main lever 13 and the lever 23 of the actuator. The lever 23 of the actuator has the ability to act on the auxiliary lever 14. For this, at the end of the lever 23 of the actuator is fixed the first pin 24, the second end of which is located in the slot of the auxiliary lever 14.

Magnetic starter 12 is designed to control the MEO 11 and the electromagnet 16.

The block of limit switches 17 is designed for external signaling and control of electrical equipment of the drive. The position of the shaft 25 with the cams of the limit switch block depends on the position of the main lever 13. For this, a second pin 26 is mounted rotatably in the support 10, and an additional lever 27 consisting of a sleeve and an axis is fixed to the shaft 25 of the limit switch block, the axis of the additional the lever is located in the hole of the second finger 26.

On the body of the electromagnet is fixed the force unit 28, which forms the starting and holding currents.

A plug 29 with a socket is mounted on a vertical sheet of the base. The drive is closed from above by a casing, which is fastened to the base with screws.

To describe the operation of the valve actuator, an electrical circuit diagram is presented (Fig. 4), which shows: an input connector with a socket (XS2) and a plug (XP2), a limit switch block (A2), microswitches of a limit switch block (SQ2.NN), magnetic starter (KM1), electromagnet (YA1), force block (Ф), actuator type MEO (A1), microswitches MEO (SQ1.NN).

The operation of the automatic shut-off valve actuator is carried out in the following order:

- in the initial position, in which the valve is closed, a voltage of 220 V is applied to the first contact (figure 4) of the input connector. The lever 23 MEO is installed in its original position, in which the finger 19 is in the socket of the latch 18;

- after applying a voltage of 220 V to the second contact of the input connector, the KM1 magnetic starter activates, including the electromagnet YA1 through its force block F. The armature of the electromagnet 16 carries the rod 21 and the second earring 20. The spring 22 is compressed. The latch 18 rotates through an angle of 90 ° and thereby closes the pin 19 in the socket of the latch 18 and, therefore, connects the main lever 13 and the auxiliary lever 14. The lever 23 MEO begins to rise, dragging along the auxiliary lever 14, the main lever 13 and connected with the main lever 13, the valve stem 4. This opens the valve, and the valve spring 5 is compressed. To reduce the force at the first moment of opening the valve, a discharge of the working medium from the inlet cavity to the outlet cavity is provided due to the opening in the plate 2 of the hole that was closed by the tip 3;

- the valve opens until the microswitch SQ1.1-1 MEO opens. The moment of operation of this microswitch must correspond to the stroke of the rod equal to 0.25 of the nominal diameter of the valve;

- after the electromagnet armature is set to “stop”, after 5-7 s, the forcing unit Ф switches the starting current to the holding current;

- to close the valve, the signal from the second contact is removed, the power supply of the magnetic starter KM1 and, therefore, the electromagnet YA1 stops. Under the action of the spring 22, the latch 18 rotates in the opposite direction, releasing the pin 19. The main lever 13 and the auxiliary lever 14 are disconnected, and the valve closes due to the action of the valve spring 5;

- contact SQ1.2-2 of the microswitch ensures that the KM1 starter is switched on only if the MEO lever is in the lower position;

- the contact SQ1.1-2 of the microswitch duplicates the contact of the KM 1-2 magnetic starter when the valve is open, excluding spontaneous discharge during vibration.

The use of the force block in the proposed valve actuator can significantly reduce the energy consumed by the electromagnet, which reduces the heating of the electromagnetic coil and, ultimately, leads to increased reliability and increased service life of the actuator. Insignificant dimensions of the force block, proposed to replace the electromagnetic time relay, increase the consumer properties of the drive.

Claims (4)

1. The drive of an automatic shut-off valve, comprising a base, a support fixed to the base, a main lever and an auxiliary lever fixed to the support rotatably, an electromagnet and a limit switch unit rigidly fixed to one end of the main lever, and a latch rotatably fixed on the other end of the main lever, a latch pin fixed to the end of the auxiliary lever, a spring, an actuator and a magnetic actuator, while the actuator lever has the possibility the ability to act on the auxiliary lever, and the anchor of the electromagnet has the ability to act on the latch, characterized in that it additionally contains a forcing unit that forms the starting and holding currents of the electromagnet. 2. The automatic shut-off valve actuator according to claim 1, characterized in that the forcing unit is mounted on the electromagnet body. 3. The automatic shut-off valve actuator according to claim 1, characterized in that the electromagnet anchor is connected to the latch via an earring and a rod. 4. The drive of the automatic shut-off valve according to claim 3, characterized in that the spring is located on the stem.

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