JP7053112B2 - Sealed reciprocating agitator using bellows used for cleaning - Google Patents

Description

The present invention particularly relates to a bellows used in a stirring device that agitates the contents (object to be agitated) in a closed stirring tank by reciprocating the stirring blade up and down.

In pharmaceutical, food, and fine chemical applications, the inside of the stirring tank is completely separated from the outside to prevent contamination from the outside, and the contents in the stirring tank are reciprocated up and down by the stirring blade. There is a closed stirrer for stirring (Patent Document 1).

As a device for sealing the drive shaft that reciprocates the stirring device, for example, as shown in FIGS. 5 to 7, there is a bellows a that expands and contracts.

The bellows a includes, for example, a bellows-shaped cylindrical body made of a resin material such as Teflon (registered trademark), and the bellows-shaped tubular body is, for example, as shown in FIG. In addition, a plurality of annular notches c in the cylindrical body b are alternately spaced apart from the outer peripheral surface b1 and the inner peripheral surface b2 in the vertical direction at desired intervals in the radial direction (horizontal direction). It is easy to manufacture and the production cost is suppressed.

Further, in the bellows a, the state in which the bellows a shown in FIG. 5 is reduced and the state in which the bellows a shown in FIG. 6 is extended are alternately repeated according to the drive shaft that reciprocates up and down. It is used as the optimum one for sealing the drive shaft that drives reciprocating.

Japanese Unexamined Patent Publication No. 2011-31192

However, as shown in FIG. 7, the bellows a has a short life (low durability) due to cracks in the notch portion d formed at an acute angle due to repeated load due to expansion and contraction motion, which leads to breakage.

Further, the outer surface a1 of the bellows a that touches the contents in the stirring tank needs to be cleaned, but the cut portion d of the bellows a has a structure having an extremely small gap, and the cut portion d has an acute angle. Is difficult to clean and has a high risk of contamination because fine cracks are generated by repeated use and extremely narrow gaps are formed.

Therefore, in the field of medicine and the like, the bellows a is not currently used as a bellows of a closed reciprocating agitator.

The present invention has been made in view of such circumstances, and provides a bellows having a long life cycle, excellent detergency, and excellent economy.

The closed reciprocating stirring device using the bellows used for cleaning of the present invention has a stirring tank, a drive shaft that reciprocates up and down provided through the ceiling plate of the stirring tank, and the drive shaft. It is composed of a stirring blade provided, a bellows in which the lower surface of the ceiling plate of the stirring tank and the drive shaft are hermetically fixed, and the bellows is composed of a bellows-shaped tubular body. A plurality of bellows elements formed by sealingly connecting the upper plate body portion and the lower plate body portion composed of a thin plate-like or film-like ring at the outer edge are arranged in the vertical direction and adjacent to each other. In the above, the inner edge of the lower plate body portion of the upper bellows element and the inner edge of the upper plate body portion of the lower bellows element are tightly connected and configured, and the connected valley fold portion on the outside of the tubular body is formed. Is arcuate, and the bellows element composed of the upper plate body portion and the lower plate body portion connected by the outer edge is a plate-shaped or film-shaped ring body and the vicinity of the inner peripheral surface to the outer peripheral surface of the ring body. It is characterized by being composed of an annular notch formed by a notch of the ring body provided in the radial direction up to.

Further, it is characterized in that the upper surface of the upper plate body portion of each bellows element is formed so as to be gradually inclined downward from the inner edge toward the outer edge.

Further, the upper plate body portion and the lower plate body portion are characterized by being formed of a thin plate-shaped or film-shaped annular ring.

In the present invention, the life cycle is long, the cleaning property is excellent, and the economy is excellent.

It is a vertical sectional front view of the stirring apparatus using the bellows of this invention. It is a vertical sectional side view of the aeration agitator of Example 1. FIG. It is an enlarged vertical sectional front view of a part of the bellows of this invention. It is a vertical sectional front view which shows the extended state of the bellows of this invention. It is a partially enlarged vertical sectional front view of the bellows of FIG. It is a vertical sectional front view of a conventional bellows. It is a vertical sectional front view of the extended state of a conventional bellows. FIG. 6 is a partially enlarged vertical sectional front view of the bellows of FIG.

Examples of embodiments for carrying out the present invention are shown below.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional front view of a closed reciprocating stirring device 1 using the bellows of the present invention.

Reference numeral 2 denotes a stirring tank, in which the stirring tank 2 is formed of a cylindrical body portion, and an opening 2b for penetrating the stirring shaft is formed in the central portion of the ceiling plate 2a.

Reference numeral 3 denotes a drive shaft, which is vertically mounted on a vertically moving device (not shown), for example, a reciprocating drive motor, and penetrates the opening 2b at an intermediate portion of the drive shaft 3. It is provided.

Reference numeral 4 denotes a stirring blade, and the stirring blade 4 is made of, for example, an elliptical plate, and is connected and fixed so as to be orthogonal to an intermediate portion or a lower end portion of the drive shaft 3.

Reference numeral 5 is a bellows, wherein the bellows 5 is composed of a bellows-shaped tubular body 6, and the upper end opening 6a of the tubular body 6 is an edge portion of the opening 2b on the lower surface of the ceiling plate 2a. The lower end opening 6b is airtightly or liquidtightly fixed to the side surface of the drive shaft 3, whereby the bellows 5 seals and covers the inside and outside of the stirring tank 2. As shown in FIGS. 2 and 4, the tubular body 6 is formed so as to expand and contract in the vertical direction according to the vertical movement of the drive shaft 3.

Further, as shown in FIG. 2, the bellows-shaped tubular body 6 of the bellows 5 is composed of a plurality of bellows elements 7 that are hermetically and tightly connected to each other, and the bellows element 7 is a thin plate or a film. The upper plate body portion 7a and the lower plate body portion 7b made of an annulus are formed by being airtightly or liquid-tightly connected by the outer edge 8a of the upper plate body portion 7a and the outer edge 8b of the lower plate body portion 7b. Further, in the bellows elements 7 and 7 adjacent to each other on the upper and lower sides, the inner edge 9b of the lower plate body portion 7b of the upper bellows element 7 and the inner edge 9a of the upper plate body portion 7a of the lower bellows element 7 are airtight or liquidtight. The valley fold portion 10 on the outer side of the tubular body 6 of the connecting portion is formed in an arc shape such as an arc or an ellipse.

Further, the upper surface 7c of the upper plate body portion 7a of each bellows element 7 is formed, for example, in a truncated cone shape, gradually inclined downward from the inner edge 9a toward the outer edge 8a.

Each of the bellows elements 7 has a plate-shaped or film-shaped truncated cone-shaped annular body whose upper surface is gradually inclined downward from the inner edge toward the outer edge, and an inner peripheral surface of the inner edge of the annular body. By forming by forming an annular notch provided in the radial direction (horizontal direction) from the to the vicinity of the outer peripheral surface of the outer edge, it is easy to manufacture and the production cost can be suppressed.

Next, the operation of the closed reciprocating stirring device 1 using the bellows of this embodiment and its effect will be described.

As shown in FIG. 2, the bellows 5 is in a contracted state in which no force is applied in the vertical direction at the top dead center of the drive shaft 3, and as shown in FIG. 3, the bellows 5 is in a downward dead center of the drive shaft 3. At the point, the bellows 5 is in an extended state, and the bellows 5 expands and contracts according to the vertical movement of the drive shaft 3.

At this time, as shown in FIG. 4, since the valley fold portion 10 on the outer side of the tubular body 6 is formed in an arc shape, for example, there is no damage even after repeated operation 1 million times, and therefore the tubular shape is formed. Cleaning of the outer surface of the body 6 becomes easy.

The valley fold portion 11 inside the tubular body 6 is formed in an acute angle shape, but it is not related to cleaning, and even if the valley fold portion 11 is slightly cracked due to repeated use. There is no problem because it has nothing to do with cleaning.

Further, since the upper surface 7c of each bellows element 7 is provided with a downward gradient from the inner edge toward the outer edge, the cleaning liquid flows downward and the cleaning effect can be enhanced.

According to the present invention, it becomes possible to provide a bellows having a long life cycle and excellent detergency, and a closed reciprocating stirring device using the bellows while suppressing the production cost.

The present invention is mainly used for stirring in the fields of medicine, food and fine chemicals.

1 Sealed reciprocating stirring device 2 Stirring tank 2a Ceiling plate 2b Opening 3 Drive shaft 4 Stirring blade 5 Bellows 6 Cylindrical body 6a Upper end opening 6a Lower end opening 7 Bellows element 7a Upper plate body 7b Lower plate 7c Top surface 8a Outer edge 8b Outer edge 9a Inner edge 9a Inner edge 10 Valley fold 11 Valley fold

Claims (2)

With a stirring tank,
A drive shaft that reciprocates up and down, which is provided through the ceiling plate of the stirring tank,
The stirring blade provided on the drive shaft and
It consists of a bellows in which the lower surface of the ceiling plate of the stirring tank and the drive shaft are hermetically fixed.
The bellows consists of a bellows-shaped tubular body.
In the tubular body, a plurality of bellows elements formed by closely connecting an upper plate body portion and a lower plate body portion composed of a thin plate-shaped or film-shaped ring at an outer edge are arranged in the vertical direction, and at the same time, a plurality of bellows elements are arranged in the vertical direction. In the bellows elements adjacent to each other, the inner edge of the lower plate body portion of the upper bellows element and the inner edge of the upper plate body portion of the lower bellows element are hermetically connected and configured.
The connected valley folds on the outside of the tubular body are arcuate.
The bellows element composed of the upper plate body portion and the lower plate body portion connected by the outer edge is provided with a plate-shaped or film-shaped ring body and a radial direction from the inner peripheral surface of the ring body to the vicinity of the outer peripheral surface. A closed reciprocating stirring device using a bellows used for washing, which is composed of an annular notch formed by a notch of the ring body. The closed reciprocating stirring device using a bellows used for cleaning according to claim 1, wherein the upper plate body portion and the lower plate body portion are formed of a thin plate-shaped or film-shaped annular ring. ..

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