JPH0720636Y2 - High speed shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a high-speed shutter that can be quickly operated and can reliably achieve sealing.

(Prior Art) In a fusion reactor, in order to generate high-temperature plasma, neutral particles are injected into the fusion reactor from a neutral particle injection device to perform heating. In this fusion reactor, there are active substances such as tritium and deuterium in the high temperature plasma, and these active substances flow into the neutral particle injector. That is, the neutral particle injector has a large-capacity vacuum pump (cryopanel) for removing deuterium ions.
1.3 × 10 torr) is the vacuum degree of the fusion reactor (about 8 × 10 torr)
This is because it is set lower. Therefore, it is necessary to prevent these active substances (especially tritium) from flowing into the neutral particle injection device and being exhausted except when it is incident. Therefore, it is necessary to provide a high-speed shutter between the fusion reactor and the neutral particle injector, which opens only when the neutral particles are injected.

As the above-mentioned high-speed shutter, conventionally, a mechanism has been adopted in which the valve body moves in the surface direction with respect to the valve seat to open and close the valve while maintaining a slight gap between the valve body and the valve seat, which is acceptable. If the conductance becomes severe (small), it is necessary to reduce the gap between the valve body and the valve seat. However, if the conductance is reduced, the valve body moves at high speed and slides on the valve seat, causing galling and welding. Could cause trouble.

(Purpose of the Invention) The present invention was made in order to solve such a conventional problem, and enables quick operation, and there is no possibility of trouble such as welding, and a reliable seal is provided. It provides a high speed shutter that can be achieved.

(Structure of the Invention) This invention relates to a valve box provided in a fluid passage, a valve seat provided in the valve box, and a valve body for closing the passage by abutting the valve seat. A valve rod having a valve body integrally attached to one end and an operating member integrally attached to the other end, and a shaft for holding the valve rod and swinging the valve body in the surface direction of the valve seat. The support rod swings around, a drive means having a crank arm attached to a drive shaft, a swinging force transmitting means and an advancing / retreating force transmitting means provided on the operating member and the crank arm, and the valve rod includes The support is held by the support so that it can swing in a direction orthogonal to the swinging direction of the support, and the swinging force transmitting means includes both members so that the operating member swings in the same direction as the crank arm when the crank arm swings. It is configured by engaging the above The retraction force transmission means includes a crank arm and an operating member so that the swinging of the crank arm causes the valve body to swing in a direction orthogonal to the swinging direction at the beginning and end of opening of the valve body to move forward and backward with respect to the valve seat. And are engaged with each other.

(Embodiment) In FIG. 5, a nuclear reactor 15 is equipped with a vacuum valve 15, a high-speed shutter 1 and a conduit 13 in the outer periphery of a neutral particle injector 14 in a fusion reactor 11.
Connected through. Vacuum valve during operation of fusion reactor 11
12 is opened, and the fusion reactor 11 and the neutral particle injector 14 are maintained at a high vacuum by a vacuum pump (not shown).

When the neutral particles 113 are injected into the fusion reactor 11 from the neutral particle injector 14, the high-speed shutter 1 is opened and the ion source gas pipe
Deuterium gas supplied through 17 ion beam generator
After being ionized and accelerated in 16 and made into neutral particles 113 through the ion neutralization cell 18, they are made incident on the fusion reactor 11. Ions 114 that have not been neutralized are deflected by the deflection magnet 19 and absorbed by the beam dump 110, and then adsorbed to the cryopanels 111 and 112 to be removed. When the injection of the predetermined neutral particles is completed, the generation of neutral particles is stopped and the high-speed shutter 1 is closed in a short time to prevent a large amount of deuterium and tritium 115 from flowing back from the fusion reactor 11.

The high speed shutter 1 is configured as shown in FIGS. That is, the valve box 2 is arranged in a seal structure on both end pipes of the conduit 13 with a gasket 29 interposed, and a valve seat (seal bellows) is provided on one side of the valve box 2.
3 is arranged, and the valve body 4 is arranged in contact with the valve seat 3. A valve rod 40 is coupled to the upper portion of the valve body 4, the valve rod 40 penetrates through a through hole 22 of the valve box upper plate 21 and projects upward, and a swinging flange 41 is coupled to the upper end portion by a nut 42. Has been done.

A bellows 43 is arranged around the through hole 22 in the penetrating portion, and an upper end portion of the bellows 43 is connected to a swinging flange 41 to which a valve rod 40 is attached, whereby a valve rod is attached.
The portion where 40 penetrates the upper plate 21 is sealed so that the valve rod 40 can move in any direction.

A pair of bearing bases 25 are mounted on the upper plate 21 of the valve box 2,
On the other hand, a shaft 50 is provided on both sides of the support column 5 so as to project.
The bearing base 25 and the bearing lid 28 rotatably hold the bearing 50 via the bearing 26. Further, a pair of bearing grooves are formed on both sides of the support column 5 in the direction orthogonal to the shaft 50, and the bearings 27 are attached thereto, while one side of the swing flange 41 is provided with the shaft 51.
Is provided so as to project, and the shaft 51 is rotatably held by the bearing 27.

A link frame (actuating member) 44 is coupled to the upper end of the swinging flange 41, and the link frame 44 has a guide groove 45 formed of an oval through hole. The drive shafts 6 and 7 are connected to each other by a crank arm 70 and a crank pin 73 at the tip thereof, and the crank pin 73 penetrates the guide groove 45 of the link frame 44 and has a rotary bearing 74 in its penetrating portion.
Is installed. Further, a roller follower 76 held by a mounting seat 77 is opposed to the tip of the crank arm 70.
Attached, link frame by this roller follower 76
Both sides of 44 are sandwiched. The roller follower 76 moves on the side surface of the edge of the guide groove 45, but this side surface is a link frame.
An inclined surface 79 is formed only on the upper end portion of 44, and a flat surface 78 is formed on the other portions.

The guide groove 45, the crank pin 73, and the rotary bearing 74 form a swinging force transmitting means, and the roller follower 76 and the inclined surface 79 form an advancing / retreating force transmitting means for moving the valve body 4 in a direction orthogonal to the valve seat. ing.

At the ends of the drive shafts 6, 7, bearings 62 are fitted with sleeves 64 and nuts 6
Bearing housing 6 on bearing mount 66 mounted by 5
The drive shafts 6 and 7 are rotatably held by 1. The shaft end of the drive shaft 7 is connected to a hydraulic motor 8 and a servo valve 83 via a coupling 81, which are supported by a drive frame 86 and bearing housings 84, 85 mounted thereon. A hydraulic unit (not shown) is connected to the servo valve 83 by a hydraulic pipe, and a control box is connected by electric signal wiring. Then, the servo valve 83 receives a signal input to the control box, and causes the hydraulic motor 8 to drive the hydraulic motor 8 in accordance with the signal, thereby causing the servo valve 83 to operate.
It is configured to control the amount of oil flowing into the hydraulic motor 8 through.

Although the hydraulic motor is illustrated as the drive device, the drive device is not limited to this, and another drive device, for example, an electric motor may be adopted.

Next, the operation of this device will be described. 1 to 3 show the valve closed state, and when the drive shaft 7 is rotated in the counter time direction in FIG. 3 by the hydraulic motor 8 from this state, the drive shaft is
Roller follower 7 attached to the tip of arm 70 of 6,7
Since 6 moves along the inclined surface 79 of the edge of the link frame 44, the link frame 44 is centered around the shaft 51 in the direction orthogonal to the paper surface of FIG.
In the figure, the valve body 4 starts to rotate in the direction away from the valve seat 3) and the rotary bearing 74 mounted on the crank pin 73
By moving in the groove 45, a force is applied to the link frame 44 to rotate clockwise about the shaft 50 (the direction in which the valve body 4 moves to the left in FIG. 1). It should be noted that when the pair of roller followers 76 starts to swing along the inclined surface 79, the arm 70 rotates about the shaft 50 with respect to a change in the rotation angle θ (FIG. 3) of the drive shafts 6, 7. The change in the rotation angle α of the link frame 44 is extremely small, and the valve body 4 does not substantially move in the surface direction of the valve seat 3 (the direction of the left phantom line in FIG. 1).

On the other hand, during this period, the link frame 44 rotates about the shaft 51 at the rotation angle β
(FIG. 3) The valve body 4 which rotates and presses the valve seat 3 moves leftward in FIG. 2 and separates from the valve seat 3. That is, in the initial stage of the rotation of the drive shafts 6 and 7, the valve body 4 moves only in the direction substantially retracting from the valve 3.

When the drive shafts 6 and 7 further rotate, the roller follower 76 moves on the plane 78, so that the rotation of the link frame 44 around the axis 51 disappears and the roller follower 76 rotates only around the axis 50 to move the valve body 4 to the valve seat. 3 is moved to the side of the valve seat 3 in the plane direction of 3.
Then, when the position of the phantom line in FIGS. 1 and 3 is reached, the valve is opened. When the drive shafts 6 and 7 are rotated in the reverse direction from the valve open state, the operation opposite to the above is performed. That is, the link frame 44 is rotated around the axis 50 from the state of the phantom line in FIG.
Is moved toward the front surface of the valve seat 3 in the surface direction of the valve seat 3, and then the roller follower 76 moves on the inclined surface 79 to rotate the link frame 44 around the axis 51 to thereby move the valve body 4
Is pressed forward against the valve seat 3.

In this way, the link frame 44 is provided with the inclined surface 79 and is configured to be rotatable around the shaft 51, so that the valve body 4 is substantially relative to the valve seat 3 when the valve is opened and closed. The operation is performed such that the valve seat is moved in the lateral direction after being retracted in the orthogonal direction, or is moved from the lateral direction to the front surface and is then crimped to the valve seat in the direction orthogonal to the surface. In addition, the valve body 4
When the valve seat 3 moves forward and backward with respect to the valve seat 3, the valve seat 3 also moves in the same direction by its own elasticity, but the amount thereof is smaller than the moving amount of the valve body 4. Therefore, when the valve is opened and closed, the valve body 4 and the valve seat 3 do not slide, and there is no risk of problems such as galling and welding, and it is possible to reliably achieve sealing even under high vacuum. it can.

(Effects of the Invention) As described above, in the present invention, in the valve opening / closing mechanism, the rotational movement of the drive shaft causes the valve body to move forward and backward with respect to the valve seat and to move laterally to the valve seat. In order to convert the valve into a valve seat, and this is performed continuously, when the valve is opened and closed, the valve body is first moved substantially in the direction orthogonal to the valve seat. Therefore, there is no risk of problems such as welding, and the operation is quick and reliable sealing can be achieved. Therefore, it is extremely excellent as a high-speed shutter used in a high vacuum such as between the fusion reactor and the neutral particle injector.

[Brief description of drawings]

FIG. 1 is a cross sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II, FIG. 3 is a sectional view taken along the line III-III in FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is an overall explanatory view of a neutral particle injector to which the present invention is applied. 1 ... High-speed shutter, 2 ... Valve box, 3 ... Valve seat, 4 ... Valve body, 5 ... Post, 6,7,8 ... Drive means, 40
…… Valve.

Claims (1)

[Scope of utility model registration request] 1. A valve box provided in a fluid passage, a valve seat provided in the valve box, a valve body that closes the passage by contacting the valve seat, and the valve body has one end. And a valve rod integrally attached to the other end, and an operating member integrally attached to the other end, and a valve rod that holds this valve rod and swings around an axis so that the valve body swings in the surface direction of the valve seat. Column, a driving means having a crank arm attached to a drive shaft, a swinging force transmitting means and an advancing / retreating force transmitting means provided on the actuating member and the crank arm. The swinging force transmitting means is held by a column so as to be swingable in a direction orthogonal to the moving direction. The swinging force transmitting means engages both members so that the operating member swings in the same direction as the crank arm swings. The forward / backward force transmitting means is configured When the crank arm swings at the beginning and end of opening of the valve body, the crank arm and the operating member engage so that the valve body swings in a direction orthogonal to the swinging direction and moves back and forth with respect to the valve seat. A high-speed shutter characterized by being configured.