JPH055993Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a vertical fermenter, and more particularly to one characterized by a sealing structure between a rotating shaft passing through a tank bottom plate and the bottom plate.

(Prior art) A vertical fermenter that feeds fermented materials such as animal manure and industrial waste into a vertical tank, and supplies air into the tank to aerobically ferment the fermented materials under a predetermined moisture condition. is used.

In this vertical fermenter, a rotating shaft generally penetrates through the tank bottom plate, and the fermented material is fermented under the stirring action of stirring blades fixed to the rotating shaft.

Therefore, in this fermenter, it is necessary to seal the part of the tank bottom plate through which the rotating shaft passes, and so conventionally, as shown in FIG. A rubber gasket 106 is fitted and attached to the rotary shaft 104 on the lower surface side, and its outer circumferential surface is tightened with a band 108, and is pressed upward by a jack up device 110, so that the inner circumferential surface of the rubber gasket 106 is attached to the outer circumferential surface of the rotary shaft 104. Furthermore, the upper surface was brought into close contact with the lower surface of the tank bottom plate 100 (strictly speaking, the reinforcing material 102), thereby sealing the space between the rotating shaft 104 and the tank bottom plate 100.

(Problem that the invention aims to solve) However, this seal structure cannot completely prevent the powder from leaking inside the tank, and once the powder adheres to the seal surface, it acts like an abrasive grain. This accelerates the wear of the packing 106.

In addition, since a large force is applied to the rotating shaft 104 inside the tank, the rotating shaft 104
The shaft 104 and the gasket 106 undergo a so-called "miso-suri" motion, which also contributes to accelerated wear of the shaft 104 and the packing 106.

(Means for Solving the Problems) The present invention was made to solve such problems, and its gist is that a rotating shaft penetrates the tank bottom plate and is fixed to the rotating shaft. In a vertical fermenter of the type that ferments fermented materials such as livestock feces and industrial waste in a tank under the stirring action of stirring blades, a plate-shaped O-ring holder with a fitting hole in the center is attached to the tank bottom plate. At the same time, a plurality of annular grooves are provided on the circumferential edge of the fitting hole on the upper surface of the O-ring holder and on the outside thereof, and a plurality of annular grooves are provided in the circumferential edge of the fitting hole on the upper surface of the O-ring holder. A second O-ring is fitted into an annular groove on the outside of the first O-ring, and the first O-ring is brought into close contact with the outer peripheral surface of the rotating shaft, and the first O-ring and/or the second O-ring are fitted into the outer annular groove. The O-ring is brought into close contact with the bottom surface of the tank bottom plate or a member fixed thereto so as to be thrust slidable, and lubricant is supplied and retained between the tank bottom plate or the member fixed thereto and the O-ring holder. Therefore, the sealing action of the O-rings is performed in the presence of the lubricant.

(Functions and Effects of the Invention) In this way, the present invention attaches the O-ring holder to the rotating shaft to hold a plurality of O-rings, and the innermost first O-ring connects the rotating shaft. A device that seals between the O-ring holder and the thrust surface of the holder and the tank bottom plate using the first O-ring and/or one or more second O-rings on the outside. It is. In addition, in this invention,
A lubricant such as grease is supplied and retained on the sealing surface.

In this invention, a lubricant is held in the space between the O-rings, and the lubricant fills the gap between the tank bottom plate or a member fixed thereto and the O-ring holder to perform a sealing function. At the same time, it is constantly supplied to the sliding surface of the O-ring to provide lubrication. Therefore, even if powder leaks from inside the tank, wear of the O-ring is suppressed by the lubricating action of the lubricant, and high sealing performance is maintained forever.

The number of second O-rings may be one or two or more, and if two or more second O-rings are arranged concentrically, the rotating shaft penetrates the tank bottom plate in two stages. The advantage is that a higher sealing function can be obtained by sealing in three stages.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

In FIG. 2, reference numeral 10 denotes a vertical fermenter which is an example of the present invention, and includes a tank 12, a rotating shaft 14 extending vertically inside the tank 12, an agitation blade 16 fixed to the rotating shaft 14, and a tank 12
It has a drive device 18 that rotationally drives the rotary shaft 14 at the outer lower part of the rotary shaft 14 . The fermented product 20 introduced into the tank 12 from an input port (not shown) is fermented under predetermined moisture conditions while being stirred by the stirring blades 16.

These rotating shaft 14 and stirring blades 16 include
While a passage for circulating outside air is formed, a blower 22 is disposed above the tank 12, and after the outside air sent out by the blower 22 flows through the passage of the rotating shaft 14 and the stirring blade 16, , from the supply port of the stirring blade 16 to the tank 1
It is sent out within 2.

On the other hand, the exhaust gas from tank 12 is
2 is taken out to the outside through the opening 24 or the piping 26.

The rotating shaft 14 extends through the bottom plate 28 of the tank 12, as shown in detail in FIG. First and second plates 32 and 34 are fixed to the bottom plate 28 via a member 30 having a U-shaped cross section. Furthermore, these first and second plates 3
2 and 34 are fixed in position, and the portion between them is sealed with an O-ring 35. Nao 3
1 is a urethane material.

A disk-shaped O-ring holder 36 is disposed further below the second plate 34, and this O-ring holder 36 is fixed to the rotary shaft 14 by an attachment member 38. The O-ring holder 36 has a fitting hole 40 in its center, and is fitted and attached to the rotary shaft 14 through this fitting hole 40. On the upper surface of the O-ring holder 36, as shown in Fig. 3, a first O-ring groove 42 is provided on the periphery of the fitting hole 40, and second O-ring grooves 44, 46 are provided on the outside thereof. A first O-ring 48 and a second O-ring 50 are fitted in each O-ring groove.
The first O-ring 48 is brought into close contact with the outer circumferential surface of the rotary shaft 14 and the lower surface of the second plate 34 so as to be capable of radial and thrust sliding, respectively.
The first and second plates 30 and 52 are each brought into close contact with the lower surface of the second plate 34 so as to be capable of thrust sliding.

The space between these O-rings 48, 50, 52 is supplied and filled with grease 56 through a passage 54.

In addition, in FIG. 1, 58 is an adjustment bolt for height adjustment.

In the vertical fermentation machine of this example, the rotating shaft 1
The part between the O-ring holder 36 that rotates together with the O-ring 4 and the second plate 34 that is fixed in position is
8, 50, 52 and grease 56. Specifically, the first O-ring 48 connects the outer peripheral surface of the rotating shaft 14 and the O-ring holder 36.
Also, the first O-ring 48 and the two second O-rings 50, 52 seal between the upper surface of the O-ring holder 36 and the lower surface of the second plate 34. In addition, the space is sealed by the grease 56 held between these O-rings, increasing the sealing effect.
6 is supplied to the sliding surfaces of each O-ring 48, 50, 52 to perform a lubricating action, so even if powder leaks from inside the tank 12, the powder will not act like abrasive grains and the seal will be sealed. Functionality is maintained over a long period of time.

In addition, in the seal structure of this example, the O-ring 4
By cutting O-rings 8, 50, and 52 at one point in the circumferential direction, when the O-ring needs to be replaced, it can be done without removing the O-ring holder 36 etc. from the rotating shaft 14. It can be carried out.

Although the embodiments of the present invention have been described in detail above, the present invention can also be applied to vertical fermenters having forms other than the above examples, within the scope of the invention.
It can be configured with various modifications.

[Brief description of the drawings]

Fig. 1 is a sectional view of the main part of the sealing part of a vertical fermenter that is an embodiment of the present invention, Fig. 2 is a diagram schematically showing the internal structure of the vertical fermenter, and Fig. 3 is a It is a further enlarged cross-sectional view of the main part of FIG. 1, and FIG. 4 is a cross-sectional view of the main part showing an example of a conventional seal structure. 12...tank, 14...rotating shaft, 16
... Stirring blade, 20 ... Fermented product, 28 ... Bottom plate, 3
2, 34... Plate, 36... O-ring holder, 40... Fitting hole, 42, 44, 46... O-ring groove, 48... First O-ring, 50, 52...
Second O-ring, 56...Grease.

Claims (1)

[Scope of Claim for Utility Model Registration] A rotating shaft penetrates the bottom plate of the tank and enters inside, and ferments fermented materials such as livestock manure and industrial waste in the tank under the stirring action of stirring blades fixed to the rotating shaft. In this type of vertical fermenter, a plate-shaped O-ring holder having a fitting hole in the center is fitted and attached to the rotating shaft under the tank bottom plate, and the upper surface of the O-ring holder is fitted. A plurality of annular grooves are provided at the circumferential edge of the hole and the outside thereof, and a first O-ring is fitted into the annular groove at the circumferential edge of the fitting hole, and a second O-ring is fitted into the annular groove on the outside thereof. While bringing the first O-ring into close contact with the outer peripheral surface of the rotating shaft, the first O-ring and/or
Alternatively, the second O-ring is brought into close contact with the bottom surface of the tank bottom plate or a member fixed thereto so as to be thrust slidable, and a lubricant is applied between the tank bottom plate or the member fixed thereto and the O-ring holder. A vertical fermenter characterized in that the lubricant is supplied and retained, and the O-rings perform a sealing action in the presence of the lubricant.