JP2614066B2 - Spring return type electric valve - Google Patents

Description

Description: Object of the invention (industrial application field) The present invention relates to an electric valve for opening or closing a pipe for flowing a fluid such as water, oil, gas or the like by electric operation, and in particular, to a power failure By turning off electricity at times or in emergencies
The present invention relates to a small and highly reliable spring return type electric valve in which a valve is closed or opened by the force of a spring.

(Prior Art) Conventionally, for this type of application, a ball valve or a butterfly valve having a small rotation speed (angle) required for operation of 90 degrees has been used. In addition, since it is extremely difficult to incorporate a return spring in these valves, the return spring is provided outside the body, such as by being incorporated in an electric drive device.

(Problem to be solved by the invention) The conventional spring return type electric valve described above is
The return spring must be provided outside the body, for example, by being built in the electric drive device, and the structure is complicated and expensive.

Further, in the case of a ball valve, a preload is applied between the ball and the seat, and in the case of a butterfly valve, in the closed state, the disc is biting into the seat. The operating force required for opening and closing is also large, so that the electric drive unit must be large,
The return spring was also used for high loads.

Therefore, the conventional spring return type electric valve is
There was a problem that it was large and expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of a conventional spring-return electric valve, and an object of the present invention is to provide a compact, inexpensive spring-return electric valve with a simple structure. Is what you do.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, a spring return type electric valve of the present invention is configured as follows.

That is, the valve is a valve that is opened and closed by an electric driving device. The valve includes a valve hole, a valve seat surrounding the valve hole, a disc guide, a pipe connection portion, a stem insertion hole, and an electric driving device mounting seat. A disc having a seat and a stem connecting portion to be attached to and detached from the valve seat, and a disc guided by the disc hole and the disc guide, and a disc attached to the stem loading hole and attached to the stem connecting portion. A stem having a connected disc connection,
A coil spring mounted between the disc and the body for resiliently opening or closing the disc, and the electric drive device mounted on the electric drive device mounting seat and connected to the stem; The connection between the connection and the disc connection was such that the seat was seated or unseated on the valve seat by rotating the stem forward or backward approximately 90 degrees. In this case, the stem and the disc are perpendicular to each other at a center line, and the disc connecting portion is an eccentric cylinder provided at a lower end portion of the stem, and the stem connecting portion is perpendicular to the center line of the disc. Preferably, the eccentric cylinder has an oblong hole having a width substantially equal to the diameter of the eccentric cylinder, and the eccentric cylinder is inserted into the oblong hole to connect the stem to the disc. Further, the sheet may be made of rubber or resin, and the coil spring may be mounted so as to repel the disc in the closing direction or to rebound in the opening direction. Is also good.

(Action) According to the spring return type electric valve of the present invention,
If the electric drive rotates the stem by almost 90 degrees and opens or closes the valve, and then turns off electricity in case of a power outage or emergency, the electric drive loses its rotational force, and the disc is driven by a coil spring. The valve is moved so as to close or open by the generated force.

In this case, since the disc is guided by the valve hole and the disc guide, the disc can be smoothly and correctly seated or unseated on the valve seat. When the sheet is made of rubber or resin, the sealing property is good.

Incidentally, the disc connecting portion of the stem is an eccentric cylinder, which corresponds to a crankshaft having the stem as a main shaft, and slides in an oblong hole which is the stem connecting portion of the disc to rotate the rotation of the stem. Convert smoothly to linear motion.

Further, as described above, since the coil spring acts as a return spring, it is not necessary to provide the spring outside the body, for example, by incorporating the spring in the electric drive device. Furthermore,
Since no special frictional resistance is applied to the movement of the disc, the operating force of the valve may be small, the electric drive device may be small, and the coil spring may be small, so that the body does not increase.

(Example) Hereinafter, an example of a spring return type electric valve of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention,
FIG. 2 is a cross-sectional view showing a XX section of FIG.

1 and 2, a valve A is a valve that is opened and closed by an electric driving device 1, and the valve A is a body 2, a disc 3, a stem 4, a coil spring 5, and an electric driving device 1. It is composed of

The body 2 is formed by screwing a cap 2b onto a main body 2a, and the main body 2a is provided with a valve hole 2c, a valve seat 2d surrounding the valve hole 2c, a stem mounting hole 2e, and an electric drive device mounting. It has a seat 2f and one pipe connection part 2g, and the cap 2b is a disc guide 2h
And the other pipe connection portion 2i.

The disc 3 has a seat 3a to be attached to and detached from the valve seat 2d and a stem connecting portion 3b, and is guided by a valve hole 2c and a disc guide 2h.

The stem 4 has a disk connecting portion 4a attached to the stem insertion hole 2e and connected to the stem connecting portion 3b.

The center line of the stem 4 and the disc 3 are orthogonal to each other.
The disc connecting portion 4a is an eccentric cylinder provided at the lower end 4b of the stem 4.
4c, the stem connecting portion 3b is an oblong hole 3c orthogonal to the center line of the disc 3 and having a width b substantially equal to the diameter d of the eccentric cylinder 4c, and the eccentric cylinder 4c is inserted into the oblong hole 3c. The stem 4 is connected to the disc 3 by rotating the stem 4 forward or backward by approximately 90 degrees so that the seat 3a is seated or unseated on the valve seat 2d.

FIG. 3 is the same cross-sectional view as FIG. 2, showing a state in which the stem 4 is rotated by approximately 90 degrees as indicated by an arrow, and the eccentric cylinder 4c moves the disc 3 to the open position through the oblong hole 3c. Is shown.
2 and 3, the circle drawn by a double-dashed line indicates the stem 4, and the eccentric cylinder 4c is separated from the stem 4 by a dimension C.
The eccentric distance C corresponds to the lift of the disc 3.

Further, the coil spring 5 is mounted between the disc 3 and the body 2, and resiliently pops the disc 3 in the closing or opening direction. In the embodiment shown in FIGS. 1 to 3, the coil spring 5 springs the disc 3 in the closing direction. Further, in another embodiment shown in a cross-sectional view in FIG. 4, the coil spring 15 resiliently urges the disc 13 in the opening direction.

Further, the electric drive device 1 is mounted on the electric drive device mounting seat 2 f and connected to the stem 4.

 In the figure, reference numeral 6 denotes a stem packing.

Next, the operation of the embodiment shown in FIGS. 1 to 3 will be described.

FIG. 3 shows a state in which the electric drive unit 1 rotates the stem 4 substantially in the direction of the arrow by 90 degrees, moves the eccentric cylinder 4c in the direction of the arrow, and moves the disc 3 to the valve opening position. is there.

In this state, if a power failure occurs or the power is cut off in an emergency, the electric driving device 1 loses its rotational force.
Moves to the valve closing position shown in FIGS. 1 and 2 by the elastic force of the coil spring 5, and closes the valve.

In this case, since the disc 3 is guided by the valve hole 2c and the disc guide 2h, the disc 3 can be smoothly and correctly seated on the valve seat 2d. If the sheet 3a is made of rubber or resin, the sealing property is good.

The disc connecting portion 4a of the stem 4 is an eccentric cylinder 4c, which corresponds to a crankshaft having the stem 4 as a main shaft, and slides in an oblong hole 3c which is a stem connecting portion 3b of the disc 3, The rotational movement of the stem 4 is smoothly converted to the linear movement of the disc 3.

Further, as described above, since the coil spring 5 functions as a return spring, it is not necessary to provide the spring outside the body 2 such as by incorporating the spring in the electric drive device 1.
Further, since no special frictional resistance is applied to the movement of the disc 3, the operating force of the valve A may be small, and the electric drive 1
Is smaller and the coil spring 5 can be smaller, so that the body 2 does not become larger.

According to the present invention described above, since the return spring is built in the body, it is not necessary to provide the return spring outside the body such as being built in the electric drive device, and the structure is simple and inexpensive. .

Further, since the operating force required to open and close the valve is small, the electric drive device can be small, and the coil spring can be small, so that the body can be small.

For this reason, the spring return type electric valve of the present invention has an effect that the structure is simple, compact and inexpensive.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a spring return type electric valve according to the present invention, FIG. 2 is a transverse sectional view showing an XX section of FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a state where the valve is opened, and FIG. 4 is a cross-sectional view showing another embodiment of the spring return type electric valve of the present invention. A: Valve 1: Electric drive unit, 2: Body 2c: Valve hole, 2d: Valve seat 2e: Stem insertion hole 2f: Electric drive unit mounting seat 2g, 2i: Piping connection 2h … Disc guide, 3,13… disc 3a… sheet, 3b …… stem connecting part 3c …… elliptical hole, 4 …… stem 4a …… disc connecting part, 4b …… lower end part 4c …… eccentric cylinder , 5,15 …… Coil spring

Claims (6)

(57) [Claims] 1. A valve which is opened and closed by an electric drive device, the valve comprising a valve hole, a valve seat surrounding the valve hole, a disc guide, a pipe connection portion, a stem charging hole, and an electric motor. A body having a drive device mounting seat, a seat having a seat to be attached to and detached from the valve seat, and a stem connecting portion, a disc guided by the valve hole and the disc guide, and mounted in the stem charging hole; A stem having a disc connecting portion connected to the stem connecting portion, a coil spring mounted between the disc and the body to resiliently open or close the disc, and mounted on the electric driving device mounting seat. The electric drive unit is connected to the stem, and the connection between the stem connection portion and the disk connection portion is performed by rotating the stem approximately 90 degrees forward or backward to seat the seat on the valve seat or Spring return type electric valve that can be removed. 2. A center line of said stem and said disk is orthogonal to each other, said disk connecting portion is an eccentric cylinder provided at a lower end portion of said stem, and said stem connecting portion is orthogonal to said disk center line. The spring-return electric valve according to claim 1, further comprising an oval hole having a width substantially equal to the diameter of the eccentric cylinder, wherein the eccentric cylinder is inserted into the oval hole and the stem is connected to the disc. 3. A spring return type electric valve according to claim 1, wherein said seat is made of a nonmetallic material such as rubber or Teflon. 4. The electric valve according to claim 1, wherein said seat is made of resin. 5. A spring return type electric valve according to claim 1, wherein said coil spring repels said disc in a closing direction. 6. The spring return type electric valve according to claim 1, wherein said coil spring resiliently pops said disc.