JPS6138285A - Valve driving control device - Google Patents

Abstract

PURPOSE:To standardize valve parts as a common part not so much being influenced by the variation of valve bore by using a pilot solenoid valve that is separable into a pilot valve and a control valve which are removable from the main valve. CONSTITUTION:An actuator 2 and a main valve 3 compose one unit, and a pilot solenoid valve 6 controlling the main valve 3, a means which etects the turning angle of shaft, electric wiring and electric connections all enclosed in a casing 5 compose another unit. While the dimensions of a main valve 1 and the actuator 2 are selected so as to meet the load requirement to drive the valve open or shut, the pilot valve 6 controlling the main valve 1 can be made common for all of the main valves 1 regardless of the load required to drive the valve open or shut. Thus, the control part 4 can be mass-produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive control device for a valve such as a ball valve.

[Prior art]

BACKGROUND ART Pneumatic actuators have conventionally been used as devices for controlling the rotation of a valve body drive shaft of a valve, such as a ball valve, and have a structure in which the valve body drive shaft is rotated and reciprocated by reciprocating movement of a piston of the actuator. Between the reciprocation of the piston and the drive shaft is a structural member that pivots the free end of a lever fixed to the drive shaft to the piston or piston rod, or a pinion fixed to the drive shaft and a rack fixed to the piston and meshing with the pinion. It is connected by a structural member consisting of. A solenoid valve is usually installed to control the drive of the actuator piston.

In conventional valve drive control devices, the electromagnetic valve and detection members that detect the rotation angle of the drive shaft, such as microswitches, are exposed to the outside, so depending on the location where the valve is installed, it may be affected by salt damage or become stiff. There was a risk that the particles would adhere and control would no longer be performed reliably.

Another disadvantage is that cleaning the exposed portion requires time and effort in a narrow area.

In order to solve this problem caused by exposure, it has been proposed to configure a solenoid valve attached to the actuator, a rotation angle detection member, etc. in an integrated casing. This type of drive control device eliminates the problem of exposure because the electrical contacts and mechanical sliding parts are sealed within the casing.

[Problem to be solved]

Valves of various diameters are used as valves, and the load on the valve drive shaft changes depending on the diameter.

The magnitude of the driving force also changes in accordance with changes in the load on the valve drive shaft. When the load on the drive shaft changes in this way, it is necessary to select the diameter of the solenoid valve in consideration of the actuator and drive speed according to the magnitude of the load.

In a device in which the above-mentioned control device is integrated into one casing, the entire structure including the solenoid valve and rotation angle detection member must be made in many different types according to changes in the load of the actuator. However, it has the problem of high cost and is not suitable for mass production.

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve drive control device that does not cause problems with exposed parts and can be made into a common component even when there are many types of valve diameters without being affected by changes in diameter. It is said that

[Means to solve problems]

Means for achieving the above object of the present invention includes a spool valve type main valve as a solenoid valve that controls an actuator attached to the valve body, a control section having a pilot valve and a pilot operating solenoid that can be detachably attached to the main valve. A separate pilot electromagnetic valve is provided, and a control unit is provided in which the pilot valve and solenoid, as well as the rotation angle detection member and the electrical connection part are sealed in one casing.

〔effect〕

By the above means, the actuator can be controlled by selecting and attaching a main valve of a size corresponding to the load to the actuator, and attaching a common control section to the main valve regardless of its size. This is because the main valve switches and controls compressed air with a pressure capacity according to the load, so the inlet and outlet diameters must be changed, and the size of the spool must also be changed, so various types of main valves must be prepared. This is because the flow pressure of the pilot channel for switching and moving the spool of the main valve does not need to be very large, and can be made independent of the load on the actuator.

According to the present invention, if several types of main valves are prepared depending on the number of actuators, the control section can be made common. Therefore, the control unit becomes suitable for large number production.

According to the present invention, the main valve can be constructed as a part of the actuator by being incorporated into the actuator, resulting in a compact structure.

Therefore, it is possible to have a compact structure consisting of two components, the actuator with the main valve and the control section, and both components can be connected by using piping or by directly communicating with the boats. With this structure, it is also possible to avoid exposing the mechanical sliding parts and the electrical connection part 5 to the outside as in the conventional case.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

5 and 6, an actuator 2 for driving the valve body of the valve is attached to the top of a valve, for example, a ball valve 1,
A main valve 3 is attached to the actuator 2. Main valve 3
is controlled by a biloft solenoid valve 6 provided in the control section 4.

The structures of the valve, actuator, and main valve, and the structure showing the relationship between them are not the gist of the present invention and well-known means can be used, so a description thereof will be omitted.

1 to 4, a pilot solenoid valve 6 is integrally incorporated into a casing 5 of a control section 4. As shown in FIGS.

The control section 4 is mounted on the actuator 2 in FIG. 5, and the pilot solenoid valve 6 is connected to the main valve 3 by a flow path (not shown).

A detection shaft 7 connected to the rotation shaft of the actuator 2 is rotatably supported in the casing 5 by a bearing 8 . The detection shaft 7 can be connected to the rotary shaft of the actuator by using a simple coupling, or by insertion and coupling between a square hole and the peripheral end of the shaft.

A detection cam 9 is fixed to the detection shaft 7 , and a detection switch 10 , such as a microsinch, which is turned on and off by contact with the detection cam 9 is fixed inside the casing 5 . In the example shown in the figure, there is one detection cam 10, but each detection switch 1
A plurality of detection cams may be provided separately for each zero.

A terminal connection port 11 is provided in the casing 5, and a connection plug 12 is inserted into the terminal connection port 11.

The connection plug 12 is rotatable around the center line of the terminal connection port 11, and can be fixed at any rotational position by tightening the tightening screw 13 of the casing 5. The connection plug 12 is provided with a wiring port 14 that opens in a direction perpendicular to the center line of the terminal connection port 11. Therefore, the direction in which the wiring extends can be arbitrarily selected depending on the rotational position of the connection plug 12.

A terminal plate 15 is attached to the connection plug 12, the end of a lead wire inserted from the wiring port 14 is fastened to one end of a conductor 16 embedded in the terminal plate 15, and the detection switch 1 is attached to the other end.
The conducting wire connected to 0 is fastened. A work opening 17 is formed in the connection plug 12 for work such as wiring, and can be sealed with a lid 18.

The upper end of the casing 5 in FIG. 1 is open and can be sealed with a casing lid 19.

A solenoid recess 20 and a pilot valve hole 21 having a center axis substantially parallel to a line orthogonal to the axis of the detection shaft 7 incorporated in the casing 5 at a position offset from the axis of the detection shaft 7.
has.

The pilot valve hole 21 is provided with a valve 24 whose structure is known per se.
will be incorporated. A solenoid 25 for controlling the valve 24 is incorporated into the solenoid recess 20 . The valve 24 and the solenoid 25 are not limited to the structure shown in the figure, but may have any structure as long as they are pilot valves.

In the figure, the valve 24 includes a valve seat body 26 fixed to the pilot valve hole 21 and provided with a flow path connected to a flow path formed in the casing 5, and first valve seats 27 formed at both ends of the valve seat body 26. and a first valve body 29 and a second valve body 30 seated on the second valve seat 28, respectively.

The solenoid 25 has fixed cores 31 and 32, a movable core 33 disposed between the 12 fixed cores, coils 34 and 35, and a permanent magnet 36.

When the winding 34 of the solenoid 25 is energized, the biloft solenoid valve attracts the movable core 33 toward the fixed core 31 and is held fixed at that position by the action of the permanent magnet 36. At this time, the movable iron core 33 presses the second valve body 30 against the second valve seat 28 to close the second valve seat 28. At the same time, the second valve body 30 pushes the first valve body 29 through its legs to open the first valve seat 27. In this state, the P port 37 of the pilot valve is closed and the flow path from the fluid source is cut off, so that no fluid is supplied to the main valve 3.

Further, an A port 38 communicating with the main valve 3 communicates with an R port 39, and the pilot fluid acting on the main valve 3 is discharged. Therefore, the main valve 3 assumes the 1 position shown in FIG.

When the winding 35 is energized, the movable iron core 33 is attracted to the fixed iron core 32 and is fixedly held at that position by the permanent magnet 25. At this time, since the pressing force on the second valve body 30 is removed, the first valve body 29 and the second valve body 30 are moved by the spring force, closing the first valve seat 27 and opening the second valve seat 28. .

As a result, the P boat 37 communicates with the A boat 38, the R port 39 is closed, the pilot fluid acts on the main valve 3, and the main valve 3 is switched to the position ■.

The actuator 2 is reciprocated by switching the main valve 3 as described above. When the actuator 2 switches, the detection shaft 7 rotates. When the detection shaft 7 rotates by a predetermined angle, the detection cam 9 pushes the detection switch 10, and a signal indicating that the detection shaft 7 has rotated by a predetermined angle is sent to an external control panel or the like via a conductor 16 and a lead wire.

The windings 34, 35 of the solenoid 25 are energized through the conductor 16 via a lead wire under external control.

When the detection shaft 7 rotates in the reverse direction due to the operation of the actuator 2, the detection cam 9 operates another detection switch 10 by rotating through a predetermined angle, and sends a detection signal to the external control panel in the same manner as described above. In this way, the opening/closing drive control of the valve can be performed.

In the present invention, the actuator 2 and the main valve 3 are made into one unit, and the pilot solenoid valve that controls the main valve, the means for detecting the shaft rotation angle, the electrical wiring, and the electrical connection are sealed in one casing. It can be configured as

The size of the main valve and actuator should be selected according to the load required to open and close the valve, but the pilot valve that controls the main valve should be the same for all main valves regardless of the load that drives the valve to open and close. I can do it. Therefore, the control section can be mass-produced, greatly improving productivity.

Furthermore, since the main valve is separate from the control viroft valve, the structure can be simplified, and even if many types of valves with different diameters are manufactured, the cost does not increase too much.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway view of the main parts of a control device according to the present invention;
Figure 2 is a plan view with the upper part removed, and Figure 3 is a vertical cross-sectional view.
The figure is a plan view, FIG. 5 is a front view showing the relationship between the valve, the valve drive device, and the control device, and FIG. 6 is a schematic circuit diagram of the fluid control system of the valve drive device and the control device. 1... Valve 2... Actuator 3...
・Main valve 4...Control part 5...Casing
6... Pilot solenoid valve 7... Detection shaft 9
...Detection cam 10...Detection switch Figure 5 September 25, 1982

Claims (1)

[Claims] An actuator having a rotation shaft connectable to a valve shaft of a valve, a main valve connected to the actuator through a flow path, and a control unit removably fixed to the actuator,
The control unit includes a pilot solenoid valve within a casing, a detection shaft rotatably supported by the casing and connectable to the rotation shaft of the actuator, a detection cam fixed to the detection shaft, and a detection cam fixed to the casing. A control device for driving a valve, characterized in that a detection switch that is turned on and off by the detection cam is incorporated in a sealed manner.