JPS5934085A - Valve gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve device that closes a fluid pipeline by pressing a valve plate against a valve seat, and particularly relates to a valve device in which a planetary gear also serves as a valve plate.

Valve devices of the type that press the valve plate against the valve seat to close the fluid pipeline are particularly important as valve devices used in vacuum system pipelines, but generally the mechanism is complex and large. There were many.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a valve device that can be manufactured in a small size with a simple mechanism using the principle of a planetary gear mechanism.

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

FIG. 1 is a partially cutaway perspective view of an embodiment of a valve device according to the present invention, and FIG. 2 is a partially cutaway plan view.

Both sides of the circular picture book 10 are disc-shaped guide surfaces 11 and 1.
The Y is hermetically sealed via O-rings 12 and 12'.

The side plates 11 and 11' are respectively provided with openings 13 facing each other at off-center positions, and piping 14 is hermetically connected to each of these openings to form a fluid pipeline as a whole. It consists of

Further, an internal gear 15 formed in an arc shape is fixedly installed inside the side plate, and a stopper 16 of an appropriately shaped shape is provided at a predetermined position on one end side of the internal gear 15 to stop contact with a planetary gear, which will be described later. ≦This is provided.

Reference numeral 17 denotes a valve seat, which is provided at the same position as the opening 13 and inside the side plate.

:30 is Tanabata), and a worm 3I is coaxially attached to the shaft of this motor, and the worm 31 engages with the worm wheel 32 to deflect the direction of rotational torque at right angles. On the other hand, the shaft 3 of the worm wheel 32
A spiral gear 33 is attached to the tip of 21. Another spiral gear 34 meshes with the tars spiral gear 33, and the axis of the spiral gear 34 is configured to be parallel to the axis of a drive gear 37, which will be described later.

A small-diameter shaft hole 36 is formed at a predetermined position in the side plate 11, and the rotary drive shaft 341 directly connected to the spiral gear is connected to the shaft hole 36 through a bushing 35 so that the shaft hole 36 is airtight and axially stable. The cylindrical body 10 freely penetrates and transfers rotational torque.
It is configured to transmit the signal to a drive gear 37 provided inside. Also, A is a spring, and spiral gear 3
The drive shaft 341 is loosely fitted into the gap between the drive shaft 341 and the bushing 35 while being compressed with a constant force. As shown in the figure, the drive gear 37 and the rotary drive shaft 341 are integrally connected in the rotational direction and the axial direction via the pin 34P.

Moreover, the drive gear 37 has a convex shape in the center, and the stepped part is inserted into the groove 40' of the holding plate 40 and locked.]
ing.

Reference numeral 39 designates a planetary gear which also serves as a valve plate.This planetary gear 39 meshes with the internal teeth of the internal gear 15, and is connected to the drive gear 37 in a fixed relationship by a lever-shaped holding plate 40. ing. Note that the planetary gear 39 is provided with a ring 41 at a position corresponding to the valve seat, so that when the valve seat is pressed against the valve seat,
(It is designed to maintain airtightness. Note that 42 is a worm 31, a worm wheel 32, and a spiral gear 3.
3.34, etc., and is fixed to the side plate 11. Also, the protrusion 43 of the planetary gear 39
(See Fig. 2) is loosely fitted into a stepped hole 44 of the holding plate 4o, and the bolt is inserted through two spherical spring washers 45, 45, which are arranged in opposite directions with their protrusions in contact with each other. It is pivoted at 46.

Next, the operation of the embodiment configured as described above will be explained.

When the power is turned on, the motor 30i;J rotates, and the rotational torque is transmitted in this order to the worm 31, worm wheel 32, spiral gear 33, spiral gear 34, and drive shaft 34, as described above. At this time, the spiral gear 34 transmits the rotation torque and simultaneously generates an axial component force. However, since the axial component force is greater than that of the spring force, the period during which the drive gear 37 can rotate is limited to the period when the spiral gear 3
4 transmits only rotational force.

As a result, the rotation of the drive gear 37 is transmitted to the planet gear meshing with the drive gear 37. As a result, the planet gear 39 is guided by the internal gear 15 and revolves in the direction of the arrow shown in FIG. When it comes directly above the portion 17, it comes into contact with the stopper 16 and stops.

When the planetary gear 39 stops, the drive gear 37 meshing with it also stops rotating.

However, at this time, the spiral gear 34 cannot rotate because the motor 30 tries to continue rotating or the drive gear 37 has stopped as described above, and the transmitted rotational torque is divided into axial components. This appears as a force and the spiral gear 34 tends to move in the axial direction.

On the other hand, a drive shaft 341 fixed to the spiral gear 34
Since the shaft hole 47 of the side plate 11' into which the screw fits loosely is bored in the axial direction, the spiral gear 34 resists the spring force (compressive force) due to the aforementioned axial component force. moves in the axial direction and pushes the drive gear 37 downward via the drive gear J$+b341. Then, the holding plate 40 that is locked to the gear 37 functions as a lever with the protrusion 405 at the other end as the fulcrum and the protrusion 43 as the point of action, and doubles the force of the planetary gear 39 to push the valve plate toward the valve seat. direction and close the fluid line. At this time, since the planetary gear 39 is loosely fitted into the stepped hole 44 of the holding plate 40 with sufficient margin as described above, the planetary gear 39 is uniformly pressed against the valve seat 17 without any reason. Then, when the valve seat 17 is closed by the planetary gear 39, the power to the motor becomes IUj and the motor 30 is stopped by a limit switch (not shown).In this case, the spring 38 is restored. Due to the force, a torque is generated that tries to reverse the spiral gear 34, but the worm wheel 32 and the worm 3I prevent the spiral gear 34 from reversing, so the spiral gear 34 moves in the axial direction and cannot return. Therefore, the planetary gear 39 is held in pressure contact with the valve seat f4j≦17.

Next, when the motor 30 is rotated in the opposite direction to that described above, Ajl
Following the reverse process as described above, the opening is opened and fluid can move freely. In addition, in the embodiment described above, C is 2 m (l), but the present invention is not limited to this, and it is also possible to use a hydraulic motor etc. Of course, it is also possible to directly drive the spiral gear 34 via the helical rack using the reciprocating motion of an air cylinder or the like.

As explained above, the present invention uses the planetary gear in a series of reduction gear trains as a valve plate, and also allows the movement of the valve plate, the pressure contact of the valve plate to the valve seat, etc. to be performed entirely by the reduction gear train. Therefore, it has the effect of being miniaturized with a simple structure, and the valve plate can be pressed against the valve constriction, so it is particularly effective as a valve device for vacuum pipes.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view. . DESCRIPTION OF SYMBOLS 10... Sieve body, 15... Internal gear, 16... Stopper, ]7... Valve seat part, 30... Motor, 31...
・Worm, 32... Worm gear, 33.34...
・Spiral gear, ah...spring, 37...driving gear, 39...planetary gear, koji...pressing plate. Patent applicant Koji Onishi, patent attorney representing Shimadzu Corporation

Claims (1)

[Claims] (1) Moving the valve plate forward and backward from the valve seat of the fluid pipeline.In the valve device that opens and closes the fluid pipeline, the drive vehicle rotates on its own axis and revolves along the internal gear. The planetary gear is configured as a valve plate, and the valve plate is moved forward and backward with respect to the valve seat part by the revolution l, and a mechanism is also provided for bringing the valve plate into pressure contact with the valve seat part when the fluid pipe line is closed. A valve device characterized by: