JPH0193682A - Motor operated valve - Google Patents

Abstract

PURPOSE:To improve the leak-preventing ability and reliability by driving a driving shaft by an electrical driving means while holding the shaft center line about at right angles to a contact surface of a fixed valve disc with a moving valve disc. CONSTITUTION:In a valve frame body 17 having an inlet 15 and an outlet 16 for fluid, a fixed ceramic valve disc 18 is installed in a close contact with a moving valve disc 19. The moving valve disc 19 is driven through a shaft 24 by a driving unit 25 provided outside the valve body. The shaft 24 is installed at right angles to a contact surface of the fixed valve disc 18 with the moving valve disc 19, and has degrees of freedom in the direction of shaft center line. The driving unit 25 consists of a synchronous motor 28, a gear 29, a one-way clutch 30, a transmission shaft 31, and a microswitch 32.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric valve that controls fluid using electrical drive means.

BACKGROUND ART Conventionally, there is a technique of this type as shown in FIG. (For example, Japanese Unexamined Patent Publication No. 10920/1982) A ball 2 having an opening is provided in a valve frame 1, and the ball 2 is sealed with a resin gasket 3.4. Ball 2 has shaft 5
is provided through the shaft, sealed with a shaft sealing O-ring 6, and driven by a drive section 7 provided outside. The lower end of the shaft 5 is supported by a plug 8 provided at the bottom, and the plug 8 is sealed and attached to the valve frame body 1 by a packing 9. The shaft sealing O-ring 6 is housed in a holding cylinder 10, and the holding cylinder 1o is sealed to the valve frame body 1 with an O-ring 11.
It is stopped by plug 12.

Inside the drive section 7, an electric motor 13, a gear 14, and the like are provided. The structure in which the shaft 5 penetrates the ball 2 is designed to prevent the ball from tilting due to the flow of fluid, increasing the driving torque, and preventing the ball from becoming inoperable. ``Problems to be Solved by the Invention However, the above configuration has the following drawbacks.

(1) The packing 3.4 is in contact with the ball 2, but
Because the curved surfaces were in contact with each other, a gap existed and it was not possible to completely stop the fluid. Even if a very large biasing force is applied initially to suppress the leakage, the gap between the seal 3.4 and the ball 2 will increase with use, and the leakage will become large within a short period of time. became.

(2) Since this is a valve using ball 2, the shaft 5 is
It was necessary to have a structure that penetrated the hole, which meant that the structure was complex and required many machining surfaces.

The present invention is intended to solve these conventional problems, and aims to provide an electric valve with excellent water-stopping properties and reliability.

Means for Solving the Problems In order to solve the above problems, the electric valve of the present invention is provided with a flat plate-shaped fixed valve body having an opening inside the valve body and a valve operating body in close contact with each other. , a drive shaft having an axis substantially perpendicular to the plane where the fixed valve body and the valve operating body are in close contact with each other, and an electric drive means for driving the drive shaft to adjust the opening of the flow path. It consists of

Function: With the above-described configuration, the flat plate-shaped fixed valve body and the valve operating body are in close contact with each other, so that there is no gap because the flat plate-shaped fixed valve body and the valve operating body are in close contact with each other, and there is no gap between the flat plate-shaped fixed valve body and the valve operating body. Since the shaft center is provided in approximately nine directions, the inconvenience of the valve body being tilted can be resolved without taking any special measures.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. 1 to 3 show a first embodiment of the present invention.

Inside the valve body 17, which has a fluid inlet 15 and an outlet 16,
A fixed valve body 18 and a valve operating body 19 made of ceramic are provided in close contact with each other. The fixed valve body 18 is surrounded by an O ring 2
The spring 22 is sealed by the spring 22 through the rotation stopper 21.
, and is brought into close contact with the valve operating body 19 .

The spring 22 can be attached and detached from a plug 23 provided at the bottom. The valve body 19 has two backup sheets 2 made of resin.
1', the increase in frictional force caused by the valve body 19 directly contacting the internal structure of the valve frame body 17 is alleviated. The valve body 19 is driven by a drive section 25 provided externally via a shaft 24. The shaft 24 is provided in a direction perpendicular to the contact surface of the fixed valve element 18 and the valve element 19, has a degree of freedom in the axial direction, and has a cross-sectional area larger than the pressure-receiving area of the fixed valve element 18 and the valve element 19. It is set small. The drive section 25 is
Inside the upper lid 26 and the lower lid 27, there are provided a synchronous motor 28, a gear 29, a one-way clutch 30, a transmission shaft 31 that also serves as a cam, a micro switch 32 that is a control means for detecting positional relationships, and the like. A power supply cord 33 is drawn in through a water sealing means 34. The drive unit 25 has a rainproof structure and communicates with the outside air only through the ventilation hole 35. The transmission shaft 31 is fitted to the drive shaft 25 in a concave-convex relationship, and a manual paddle 36 is fitted to the outer periphery of the transmission shaft 31.

The drive unit 25 drives the ceramic valve body 19 only in one direction, but it is configured so that it can also be operated with a manual handle 36 in case of an emergency such as a power outage. . Normally, the one-way clutch 30 transmits the power of the synchronous motor 28 that rotates in one direction, but when the clutch 30 rotates in the opposite direction, the power transmission relationship with the motor is severed. By turning it, you can open and close it manually.

Figure 2 shows details of the valve body. The fixed valve body 18 and the valve operating body 19 have exactly the same shape, and have a fan-shaped opening 37.
38, 31, 38' and grooves 39, 39' (not shown). The contact surfaces 40, 40' are lapped and finished to a mirror surface.

Therefore, when the fixed valve element 18 and the valve operating element 19 are overlapped, the linking effect (adsorption effect) due to the mirror finish allows them to be brought into close contact to some extent without applying any external force.The fixed valve element 18
The protrusion 41 of the rotation stopper 21 is fitted into the groove 39', and the claws 42, 42', 42'' and others are fitted into the valve frame 1.
It is fitted into the internal structure section of 7.

FIG. 3 is a wiring diagram of this embodiment. The open/close selection switch 43 switches the circuit to which the power supply 44 is supplied, and the microswitches 32 and 32' automatically switch the synchronous motor 28 with the valve open or closed.
The configuration is such that power supply to the device is stopped.

Next, the operation of this embodiment will be explained. The state shown in FIG. 3 is the "closed" state of the valve, and in this state, the fixed valve body 18 and the valve operating body 19 are in a state where they mutually close the openings 37, 38, 37', 38'. The flow of fluid is completely stopped. Next, when the open/close selection switch 43 is switched to "open", the motor 2B is energized, the valve body 19 rotates, and the openings 37, 38, 37', and 38' are completely communicated with each other. Then, the microswitch 32 is turned off at the cam portion of the transmission shaft 31, and the drive is stopped.

In the unlikely event that a foreign object such as a seal tape or a piece of metal gets caught during operation, the foreign object will be cut off with the same effect as ceramic scissors. If a large object that cannot be cut is caught, the synchronous motor 28 will exceed its driving force limit and will step out of step, thereby avoiding burnout. In addition, since it uses a ceramic valve body, it will not deteriorate even if used for a long time or in poor water quality conditions. Furthermore, the contact surface 40
．． 40' has a mirror finish to prevent foreign matter such as scale from adhering to it (but even if it does, the opening 37.3
The abutting surfaces 40 and 8.37' and 38' can be removed by scraping off the end faces of the 40' portions.

Therefore, even after long-term use, there will be no increase in torque or locking (
In addition to being excellent in reliability, the synchronous motor 28 can also be small.

Further, in this embodiment, since the valve operating elements 19 are driven in the same direction, control can be simplified, and the contact surface 40
．． Since the abrasive grains and tiny ceramic fragments that have entered the minute concave surface of 40' during lapping do not swing as they do during reciprocating motion, there is less wear and a longer life is achieved. Particularly in the case of electric valves, it is necessary to select the capacity of the motor with consideration for long-term use or abnormal situations, but by upgrading ceramic valves, it is possible to select a motor with a lower capacity, resulting in lower power consumption. In addition, due to electrification, there is a limit to the driving force, especially if a large foreign object gets caught in the valve body.
Since the synchronous motor 28 loses synchronism, excessive force is applied to the ceramic fixed valve element 18 and the valve operating element 19, thereby preventing the ceramic valve element 18 from chipping. Furthermore, since the fixed valve body 18 and the valve operating body 19 are flat plates that are in contact with each other, and the shaft is provided at right angles to the contact surface, the valve body may tilt due to the flow, impairing the water-stopping property, or the driving torque may be reduced. There are no drawbacks like the traditional ones.

Furthermore, since the shaft 24 has some degree of freedom in the axial direction,
Fixed valve element 18 and valve operating element 19 when water is stopped or a large flow is flowing.
However, even if it is slightly displaced due to the deflection of the backup sheet 21', etc., it will be pressed and the required driving torque will increase.
The ceramic valve body 19 will not be damaged. In addition, since the effective cross-sectional area of the shaft 24 that receives fluid pressure is set smaller than the pressure receiving areas of the fixed valve body 18 and the valve operating body 19, only the free variation of the shaft 24 when it receives fluid pressure is This prevents the valve body from moving and reducing the fitting margin with the valve body 19.

The effect of this first embodiment is that the valve body 19 is supported by the internal structure of the valve frame body 17 via the backup seat 21', so that the valve body 19 is supported by the drive unit 24 via the shaft 24. Since no force is applied, this has the effect of increasing the durability of the drive section 24.

Further, since the shaft 24 has a degree of freedom in the axial direction, even if the shaft 24 is displaced due to the deflection of the backup sheet 21', the torque does not increase due to this.

Furthermore, the shaft 24 has a pressure-receiving area smaller than that of the fixed valve body 18 or the valve-operating body 19.
This has the effect that the fitting margin with the valve operating body 19 is reduced in response to pressure, and it is possible to prevent torque from being concentrated in one part.

4 and 5 show a second embodiment of the present invention. Inside the valve frame 45, there is a fixed valve body 4 made of ceramic.
6 and a valve operating body 47 are provided.

The fixed valve body 46 is sealed around the circumference by an O-ring 48,
The rotation is prevented by the rotation stopper fitting 49, and the spring receiver 5
The valve body 47 is brought into close contact with the valve body 47 by a spring 51 supported by the spring 51 . The valve body 47 is connected to the backup seat 52
．． 53. The valve body 47 is driven by an external gear motor 5 via a shaft 54. The shaft 54 is sealed by two O-rings 56. The motor of the guard motor 55 is a synchronous motor, and a cam 58 is attached to the drive shaft 57.
Each microswitch 57 opens and closes the valve in the open and closed positions.
．． It is configured to cut 58. Guard motor 5
The end plate 59 of No. 5 is fixed to a drive unit mount 60, and the drive unit mount 60 is fixed to a mount 61 fixed to the valve frame body 45. As shown in FIG. 5, the fixed valve body 46 and the valve operating body 47 have stepped portions 64.63 in addition to fan-shaped openings 62.63.
65. This step pushing part 64,65 is used especially when it is used only for opening and closing as in this embodiment, and the contact area is reduced while maintaining the sealing performance when closing, thereby reducing the torque. be.

Further, the stepped portions 64 and 65 may reduce the wrapping area, which is doubly effective.

Of course, if the geared motor 55 has sufficient driving force, it may not be pushed in steps as shown in FIG. A stepping motor may also be used.

In this embodiment as well, the shaft 54 is provided so that its axis is parallel to the plane perpendicular to the plane where the fixed valve body 46 and the valve operating body 47 are in close contact with each other.

FIG. 6 shows a third embodiment of the invention. The fixed valve body 66 and the valve operating body 67 are urged into close contact with each other by a biasing packing 68 which also serves as a sealing material. 69 is a rotation stopper. The valve body 67 is driven via a shaft 71 by a motor 70 provided externally. This embodiment is a switching type valve, and a fixed valve body 66 and a valve operating body 67 made of ceramic are constructed in a shape as shown in FIGS. s-b and 6-c.

A feature of this embodiment is that since the flow is of a U-turn type at the valve portion, there is no need for an O-ring for sealing on the shaft 71 portion. In this embodiment as well, the shaft 71 connects the fixed valve body 66 and the valve operating body 67.

The axis is perpendicular to the contact surface.

Effects of the Invention As described above, the electric valve of the present invention provides the following effects.

(1) Sealing is achieved through close contact between the flat plate-shaped fixed valve body and the valve operating body, making surface polishing easy. Therefore, it is possible to provide an electric valve with good sealing performance.

(2) Since it has a flat plate-shaped fixed valve body with an opening and a drive shaft whose axis is approximately perpendicular to the valve body, the fluid causes the valve body to move in a direction perpendicular to the axis, unlike conventional valve bodies. Since there is no need to take measures to prevent the application of force, the structure can be simplified.

(3) Since it has a flat plate-shaped fixed valve body and a drive shaft whose axis is approximately perpendicular to the valve body, the rotational motion of the drive part is transmitted as rotational motion of the shaft, causing the valve body to rotate. The structure can be simplified and the driving force transmission efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a cutaway sectional view showing the electric valve in the first embodiment, FIG. 2 is a perspective view of the main parts, FIG. 3 is a control circuit configuration diagram, and FIG. 4(a) is the second embodiment. FIG. 5 is a perspective view showing the valve body used in the embodiment; FIG. (a) is a configuration diagram showing the third embodiment, (b) and (a)
7 is a configuration diagram of the valve body of the same embodiment, and FIG. 7 is a configuration diagram showing a conventional electric valve. 17... Valve body, 18... Fixed valve body,
19...Valve gear, 24...Shaft (drive shaft), 28...Synchronous motor (electrical drive means), 37.37', 38.38' ······Aperture. Name of agent: Patent attorney Toshi Nakao, 1 person, 8-
Synchronous motor Fig. 1 Fig. 21!1 Fig. 3 Fig. 5 Fig. 6 α Fig. 7 I3 [I direct゛('4

Claims (4)

[Claims] (1) A valve body, a flat plate-shaped fixed valve body having an opening provided in the valve body, and a flat plate-shaped valve body having an opening that is in close contact with the fixed valve body. a drive shaft for driving the valve body, the shaft center of which is provided in a direction substantially perpendicular to a plane on which the fixed valve body and the valve body are in close contact; and a drive shaft that drives the drive shaft to control the opening of the flow path. and an electric drive means for adjusting. (2) The electric valve according to claim 1, wherein the valve body has an internal structure of the valve body supporting the acting force of the fluid. (3) The electric valve according to claim 1, wherein the drive shaft has a degree of freedom in the axial direction. (4) The electric valve according to claim 1, wherein the pressure receiving area of the drive shaft is set smaller than the pressure receiving area of the fixed valve body or the valve operating body.