JPS5951331B2 - Isolation operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an isolation operating device that isolates the inside and outside of a container with a bellows and applies a swinging displacement to the bellows from the outside.

FIG. 1 shows a commonly used isolation operating device using a swinging bellows. 1' is a bellows, and mounting bracket 2
' and a mounting bracket 3' fixed to the opening outer wall of the container body 11' (vacuum on the inside, atmospheric pressure on the outside) via a seal ring 10', by welding.

9' has an opening in the center and is surrounded by the fixing fitting 3.
This is a holding fitting for a pin 5' that is fixed to the lower surface of the opening and held in the hole of the boss 6' of the opening, and the swing shaft 4' swings around the pin 5'.

The upper part of the swing shaft 4' is welded through the mounting bracket 2', and a rod such as an air cylinder is pinned to the pin hole 7' of the lower boss 8' (not shown), and the swing force is can be given. The swinging of the swinging shaft 4' is permitted by the bellows 1' to allow for displacement and swing angle, and the inside and outside of the container body 11' are shut off, making it possible to transmit force to the inside of the container body 11'. ing. In other words, when stirring the vacuum inside the container body 11' or operating the separator, when a swinging force is applied by the drive device connected to the boss part 8' of the swinging shaft 4', the swinging shaft 4' swings around pin 5'.

At this time, the movement of the swing shaft 4' is not restricted due to the elasticity of the bellows 1' attached to the container body 11' via the fixing fitting 3'. The two-dot chain line in FIG. 1 shows the state when the device swings to the right side of the figure to the maximum extent, and even when it swings to the left side, the state is symmetrical to the two-dot chain line.
In the conventional device described above, when the swing shaft 4' comes to the position shown by the two-dot chain line in FIG. 1, the bellows deforms into an S-shape in cross section.

For this reason, a relatively large stress amplitude acts on the bellows "1'. Therefore, in order to increase the durability of the bellows 1', it is necessary to lengthen the overall length of the bellows and increase the number of threads. The present invention was devised to eliminate the above-mentioned drawbacks, and the bearing device is devised so that the center of rotation of the swing shaft is located approximately at the center position in the length direction of the bellows.Hereinafter, the present invention will be described. will be explained with reference to FIGS. 2 to 5.

FIG. 2 is a partial longitudinal sectional front view of the isolation operating device according to the present invention;
3 is a side sectional view taken along the line A-A in FIG. FIG. 3 is a comparison diagram of bellows deformations. In Fig. 2, IA is a large bellows and IB is a small bellows, making it a two-stage type.

2a is a mounting bracket 5, to which the upper part of the large bellows IA and the lower part of the small bellows IB are welded, and 2b is the small bellows IB.
This is a mounting bracket for attaching to the swing shaft 4.

Reference numeral 11 denotes a container body, and a mounting bracket 3 for welding the lower part of the large bellows IA is fixed to the outer wall of the opening via a spacer 13.

10 is a seal ring between the spacer 13 and the mounting bracket 3.

That is, bellows seals of two stages of large and small bellows IA and IB are interposed between the outer wall of the opening of the container 11 and the swing shaft 4 penetrating through the opening. , external air) is isolated from the pin hole 7 of the lower end boss 8 of the swing shaft 4.
A drive device is connected to. In FIG. 3, reference numeral 12 denotes a U-shaped support swing arm welded to both sides of the swing shaft 4 near the boss 8, and the swing shaft 4 is centered around a pin 5 attached to the boss 6 above both sides. is now rotatable.

The pin 5 is located near the junction of the large bellows IA and the small bellows IB (approximately at the center when considering one bellows 1), and its end is connected to the spacer 13.
is screwed into the hole. 14 is Natsu.

In order to position the pin 5 fitted to the support swing arm 12 of the swing shaft at the junction of the large bellows IA and small bellows IB, it is not possible to place it inside the large bellows IA and small bellows IB. Due to the size difficulties, the support swing arm 12 is welded to the swing shaft 4, and the swing arm boss 6 is placed on the outside of the large bellows IA and small bellows IB, and the pin 5 is fitted to this. be. Note that θ is the swing angle of the swing shaft 4, R is the radius of the mounting bracket 2b, and R is the inner radius of the large bellows IA. To explain the operation, when the bellows IA and IB shut off the inside and outside of the container body 11 and a rocking force is applied from the outside, the position of the pin 5', which is the center of rocking, is adjusted to the bellows 1' as shown in FIG.
In the case of the conventional type provided outside the longitudinal direction of the
Although it is deformed into an S shape as shown in FIG. Since it is positioned approximately at the midpoint and the swing shaft 4 swings around the support pin 5, the deformation becomes an arc as shown in FIG. 5b.

Therefore, only tension (elongation) and compression (contraction) forces act on the bellows 1, and no unreasonable force or deformation occurs, thus eliminating the drawbacks of the conventional bellows. Further, when the bellows receives rocking displacement, in order to increase the rocking angle, it is necessary to increase the inner diameters of the bellows 1 and the rocking shaft 4 so that they do not touch each other.

However, the swing angle θ and the radius R of the mounting bracket 2b shown in FIG.
The bellows must absorb an amount of expansion and contraction corresponding to the product of . That is, if the amount of expansion and contraction is ΔL, then ΔL=R×θ. Therefore, the conventional bellows 1' (Fig. 1) is
By using the two-stage large bellows IA and small bellows IB as in this embodiment, it is possible to secure a large inner radius R that prevents the swinging shaft 4 from hitting even when swinging, and The amount of expansion and contraction of the large bellows IA and small bellows IB can be reduced. As a result, the swing angle can be increased and the stress amplitude applied to the large bellows IA and small bellows IB can be reduced, thereby significantly improving the durability of the bellows 1A and IB. In addition, in the above embodiment, the bellows has two sizes.
Although it is of a stage type, the present invention is not limited to this. In short, the present invention interposes the bellows seal 1 between the outer wall of the opening of the container 11 and the swinging shaft 4 inserted through the opening to isolate the inside and outside of the container. This isolation operating device is characterized in that a swinging support shaft (boss 6) of a supporting swinging arm 12 is provided on the outer wall corresponding to substantially the center point in the longitudinal direction of the bellows seal.

That is, in the present invention, the pivot shaft of the i pivot shaft is located at a position corresponding to approximately the center point of the bellows seal, and since the pivot shaft swings around this position, the bellows seal is This eliminates the drawbacks of conventional products because only tension and compression forces act on it, and no unreasonable force or deformation occurs.

That is, there is no need to increase the total length of the bellows and increase the number of threads.
Furthermore, in carrying out the present invention, if the bellows seal is made into a two-stage type, large and small, as described above, a sufficiently large inner radius can be ensured when the swing shaft swings, and the large and small bellows Since the amount of expansion and contraction of the seal can be reduced, it is possible to increase the swing angle of the swing shaft and reduce the stress amplitude applied to the large and small bellows, thereby increasing the durability of the bellows seal. It can be improved further.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional front view of a generally used isolation operating device using a bellows for rocking motion, FIGS. 2 to 4 show an embodiment of the present invention, and FIG. 3 is a partial longitudinal sectional front view of the isolation operating device; FIG. 3 is a side sectional view taken along line A-A in FIG. 2 and viewed in the direction of the arrow; FIG. 4 is an external plan view of FIG. FIGS. 5A and 5B are comparison diagrams of the conventional bellows and the bellows of the present invention. In the figure, 1A...Large bellows, 1B...
...Small bellows, 2a, 2b...Mounting bracket,
4... Swing axis, 12... Swing arm, 6...
...Boss, 5...Support pin, 1]...
...Container, 10... Seal ring.

Claims (1)

[Claims] 1 A bellows seal is interposed between the outer wall of the opening of the container and a swinging shaft inserted through the opening to isolate the inside and outside of the container, and the swinging arm that supports the swinging shaft is controlled. An isolation operating device characterized in that a support shaft is provided on the outer wall so as to correspond substantially to the center point in the longitudinal direction of the bellows seal.