JPH018764Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressurized sealed tank in which a cover is assembled to the opening surface of a tank body, and particularly relates to a sealed structure at a joint position between the tank body and the cover.

For example, a rotary pressure filter uses a closed pressure tank. This type of pressurized sealed tank is
It consists of a tank body and a cover.

Conventionally, the tank body and the cover are joined by tightening flanges at the joining position with bolts and nuts.

By the way, if the flange is fixed to the tank body or the cover by welding or the like, thermal distortion occurs and a good sealing condition cannot be obtained. Furthermore, as the internal pressure of a closed tank increases, the bolts and nuts become larger and the tank material becomes thicker, which requires special consideration in selecting materials and complicates processing and assembly. For the above reasons, conventional fixing means such as bolts and nuts, that is, rigid tightening of degree-of-freedom constraint type, has limitations in terms of functionality and manufacturing.

Therefore, the purpose of the present invention is not to rigidly tighten the joint, but to use so-called elastic tightening, and to actively utilize the internal pressure of the tank, thereby making the seal between the tank body and the cover more reliable. It is.

Based on the above objective, the present invention consists of a pressurized sealed tank consisting of a tank body and a cover, and the amount of deformation due to pressure at the joint part is varied depending on the difference in pressure receiving area between them. Therefore, a sealing pressure is generated at the joint between the tank body and the cover, and the sealing of the joint becomes more reliable as the pressure increases.

Hereinafter, the structure and operation of the present invention will be specifically explained based on an embodiment shown in the drawings.

First, FIGS. 1 and 2 show a pressurized closed tank 1 for a rotary pressure filter.
This pressurized closed tank 1 is composed of a tank body 2, a head 3, and a cover 4. The tank main body 2 and the head 3 are fixed to legs 5 at both ends of the tank main body 2, and are supported thereby. The horizontal shaft 7 is a hollow body, passes through the tank body 2 and the heads 3 at both ends, is rotatably supported by bearings 6 on the legs 5, and supports the leaf filter inside the tank body 2. It is in a state where it is rotated by a drive motor 8 at one end. Note that the penetrating portion between the horizontal shaft 7 and the head 3 is sealed using a gland type.

The tank body 2 has a substantially semi-circular cross section and is connected to a disc-shaped head 3 at both ends. This head 3 is fixed to the tank body 2 by fixing means such as welding. The tank body 2 and the head 3 have a saddle-shaped opening 9 on the upper surface.
is formed. This opening surface 9 corresponds to the cover 4
Closed by. In other words, the cover 4 is
It has a pressure receiving area smaller than the pressure receiving area of the tank body 2, has a substantially arcuate cross section, and is placed over the opening edge of the opening surface 9 in an overlapping state with a sealing packing 10 interposed therebetween. Note that this gasket 10 is connected in an annular manner and is connected to the tank body 2.
A storage groove 1 formed on the outside along the opening edge of the
It is housed inside 1 and protrudes outward from that part.

As shown in FIG. 3, the ends of the cover 4 are rigidly fixed by hinge bolts 12 and nuts 13 as fixing members. The hinge bolt 12 is rotatably attached to a shaft 12a of a bracket 15 attached to the end face of the head 3, and is detachably fitted into a notch 16 formed at the edge of the cover 4. ing. In this state, the nut 13 attaches the edge portion of the cover 4 to the gasket 1 of the flange 14 fixed to the end of the head 3.
It is pressed to 0.

Further, the joint between the tank body 2 and the cover 4 is restrained at appropriate intervals by tangential fixing devices such as bolts 17 and nuts 18, as shown in FIG. The bolt 17 is attached to a flange 1 fixed at the joint position of the tank body 2 and the cover 4.
It is inserted into the insertion holes 21 and 22 of 9 and 20, and prevents the tank body 2 and the cover 4 from separating in the tangential direction at the joining position. Note that reinforcing ribs 23 and 24 are attached to the flanges 19 and 20 in the circumferential direction, respectively.

In addition, the joint part between the tank body 2 and the cover 4 is
As shown in FIG. 5, a special bolt 25 and an elastic body 26
are elastically fixed at appropriate intervals.
That is, the special bolt 25 is fixed to the flange 19 and the rib 23 by screwing substantially along the radial direction. The elastic body 26 is curved, and the special bolt 2
5 and is tightened with a nut 28. The lower end portion of the elastic body 26 has a reinforcing rib 23
The upper end portion contacts the end surface of the flange 20, and its elasticity presses the inner surface of the end edge of the cover 4 against the packing 10.

As already mentioned, the pressurized sealed tank 1 of this embodiment is a rotary pressure filter, so it is equipped with a leaf filter, etc. inside, and also has a drain seat, an input port, etc. on the outside surface leading to the inside. It is equipped with

Next, the operation of the pressurized closed tank 1 will be explained.

When pressure is applied inside the pressurized closed tank 1, the pressure acts on the inner surfaces of the tank body 2 and the head 3. The pressure per unit area is the same in the tank body 2 and the cover 4, but since the pressure receiving area of the tank body 2 is set larger than the pressure receiving area of the cover 4, the pressure at the joint part of the tank body 2 is The amount of outward displacement is greater than the amount of displacement of the cover 4 in the same direction. In other words, when pressure is applied to the inside of the pressurized sealed tank 1, both the tank main body 2 and the cover 4 deform in the direction of diameter expansion at the joint, but the amount of displacement of the tank main body 2 is equal to the displacement of the cover 4 in the same direction. It's getting bigger than the quantity. Due to this difference in displacement, the gasket 10 is more firmly pressed between the tank body 2 and the cover 4. Of course, also in this case, the elastic body 26 elastically presses the joint portion of the cover 4 against the gasket 10 at the joint position of the tank body 2 by its elasticity. As a result, when pressure is applied to the inside of the pressurized sealed tank 1, the packing 10 is sealed by the resultant force of the sealing pressure due to the pressure difference in addition to the sealing pressure due to the elastic body 26. Since a pressing force proportional to the pressure acts on the joint in this way, the tangential bolts 17 can be thinner and fewer in number than conventional rigid tightening bolts. Furthermore, the flanges 19 and 20 can also be thinner and smaller than conventional rigid tightening flanges.

Note that in the above embodiment, the present invention is applied to a rotary pressure filter as an example, but the pressurized sealed tank 1 of the present invention is not limited to that application.
It can also be applied to other closed tanks and containers of this type.

In this invention, the tightening force at the joint is divided in the tangential direction and the radial direction, so the shared force of each bolt etc. is small, which makes assembly and handling easier. Since pressure contact force is applied to the joint part due to the difference in the pressure-receiving area, the sealing pressure of the joint part increases proportionally in accordance with the change in internal pressure, making the sealing between the two more reliable. is not required, so bolts, nuts, plates, etc. can be used as general-purpose items.
Selection of materials also becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the pressurized sealed tank of the present invention, Fig. 2 is a front view of the same pressurized sealed tank, Fig. 3 is an enlarged sectional view of the joint between the head and the cover, and Fig. 4. and FIG. 5 is an enlarged cross-sectional view of the joint between the tank body and the cover. 1... Pressure sealed tank, 2... Tank body, 3... Head, 4... Cover, 10... Packing, 12...
Hinge bolt, 17... bolt, 18... nut,
25...Special bolt, 26...Elastic body.

Claims (1)

[Scope of utility model registration request] A disk-shaped head is fixed to each end of the tank body, which has a semicircular arc cross section, and a packing is interposed on the outside of the opening formed by the tank body and the head, so that the pressure receiving area is larger than the pressure receiving area of the tank body. A cover with an arcuate cross-section and a small pressure-receiving area is covered in a superimposed state, and the cover is attached to the tank body and head using fixing devices, and the edge of the cover is connected to the edge of the tank body with a radius of the radius attached to the tank body. A pressurized sealed tank characterized by being elastically clamped by a bolt, a nut, and an elastic body.