JP2001087638A - Shaft sealing part of closed stirring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sterilize an axle sealing part 7 of a closed stirring apparatus with steam and sufficiently discharge a foreign matter of such as an abrasion powder generated in a shaft sealing part. SOLUTION: A hollow chamber 12 is formed under a shaft sealing part 7 to which a lip seal 10 is attached and communicated with a stirring tank 2 with a labyrinth seal 12, a steam flow outlet 15 and a foreign matter flow outlet 16 are communicated respectively to an upper part and a lower part of the hollow chamber 12 and opening and closing valves 15a, 16a are installed. At the time of carrying out steam sterilization, the opening and closing valve 15a is opened as to pass more steam near the lip seal 10. At the time of discharging the foreign matter of such as an abrasion powder 17, the opening and closing valve 15a is closed and the opening and closing valve 16a is opened to discharge the foreign matter together with steam out through the foreign matter flow outlet 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to pharmaceuticals, cosmetics,
The present invention relates to a shaft seal portion of a stirrer used to stir a material such as food in a closed state.

[0002]

2. Description of the Related Art In a stirrer for stirring the above-mentioned materials, it is necessary to particularly prevent bacteria from multiplying in the stirring tank and foreign substances from being mixed in the stirring tank from the viewpoint of hygiene. In addition, as the foreign matter that is easily mixed, there is abrasion powder generated by abrasion of the peripheral surface sealing member of the shaft sealing portion. Therefore, it is necessary to feed high-temperature steam into the stirring tank for sterilization every batch or every several batches of the stirring operation, and to prevent the abrasion powder from falling into the stirring tank.

In a conventional closed stirrer, a steam inlet is provided at an upper portion of a stirring tank, a hollow chamber surrounding a drive shaft is provided below a peripheral sealing member, and a steam outlet is provided at a lower portion of the hollow chamber. The high temperature steam is fed into the stirring tank and sterilized in the stirring tank while flowing out from the steam outlet, and if there is any wear powder dropped from the peripheral sealing member in the hollow chamber, the wear powder is removed from the steam outlet. It was made to flow out with steam. But,
In this conventional device, since the steam flows out from the steam outlet at the lower part of the hollow chamber, the amount of heat exchange with the upper part of the hollow chamber is small, and the lower part of the peripheral sealing member at the upper part of the hollow chamber and its lower part. The sterilization rate in the vicinity was low.

[0004]

SUMMARY OF THE INVENTION The present invention makes it possible to sufficiently sterilize the lower part of the peripheral sealing member and its vicinity, and to prevent foreign substances such as abrasion powder of the peripheral sealing member from falling into the stirring tank. The task is to

[0005]

According to a first aspect of the present invention, an opening is provided on an upper surface of a stirring tank, and a shaft seal portion and a bearing portion are sequentially mounted on the opening. A drive shaft rotated by a motor, supported by the bearing portion, sealed with a peripheral sealing member of the shaft sealing portion, a lower end thereof facing the stirring tank, and a stirring shaft is connected; A housing having a hollow chamber surrounding the drive shaft is provided at the lower part of the housing, a labyrinth seal and an outlet are provided at the lower part of the hollow chamber, the material is agitated by sealing the stirring tank, and the stirring tank is sterilized with high-temperature steam. In the stirrer, the housing is provided with a vapor outlet communicating with an upper part of the hollow chamber and a foreign matter outlet communicating with a lower part of the hollow chamber, and an opening / closing valve is attached to each outlet.

According to this means, when the steam outlet is opened and the foreign matter outlet is closed at the time of sterilization, a large amount of steam entering the hollow chamber flows along the upper surface of the hollow chamber to the upper steam outlet. Thoroughly sterilize the lower surface of the lip seal and its vicinity. When the steam outlet is closed and the foreign matter outlet is opened, foreign matter such as abrasion powder falling on the bottom of the hollow chamber flows out together with the steam.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a vacuum stirrer, 2 denotes a stirring tank, and a base 2a and a steam inlet 2b are provided on a ceiling portion thereof. Reference numeral 3 denotes a motor with a speed reducer, which is fixed to a support member (not shown), rotates a drive shaft 4,
The stirring shaft 5 integrated therewith is rotated. Motor 3 and base 2
The bearing portion 6 and the shaft sealing portion 7 are fixed and installed by bolts between the bearings 6a and 6a, and the drive shaft 4 is supported by the bearings 6a and 6b of the bearing portion 6.

The shaft seal 7 includes an upper housing 7a and a lower housing 7b. A seal holder 8 is fixed to the upper housing 7a.
A shaft sleeve 9 is airtightly fitted on the upper part. Three lip seals 10 are fitted to the seal holder 8 while changing the direction of the lips, and the lips are in close contact with the shaft sleeve 9 to seal the shaft. The lip seal 10 is made of polytetrafluoroethylene resin and has the same shape as an oil seal. The lower end of the shaft sleeve 9 is enlarged in diameter to form a skirt 11.

Upper housing 7a and lower housing 7b
A hollow chamber 12 is provided inside the lower housing 7b, and an upwardly directed cylindrical portion 13 which enters the skirt 11 is protruded from the inner circumference of the bottom of the lower housing 7b. The skirt 11 and the cylindrical portion 13 constitute a labyrinth seal 14. . The housing of the shaft seal 7 has a steam outlet 15 communicating with the upper part of the hollow chamber 12 and a foreign matter outlet 1 communicating with the lower part of the hollow chamber 12.
6 are provided, and open / close valves 15a and 16a are attached to each of them.

When the vacuum stirrer 1 is used, the material is put in the stirring tank 2 and hermetically closed. Air is evacuated from an appropriate passage to create a vacuum, the motor 4 is operated, and the stirring shaft 5 is rotated. For sterilization of the stirring tank 2, the vacuum stirrer 1 is stopped and the stirring tank 2 is stopped.
Can be performed when the device is empty, but can be performed during operation if there is no problem.

First, with the on-off valves 15a and 16a closed, steam at, for example, 120 ° C. and 2 atm is sent from the steam inlet 2b, and then from the stirring tank 2 through the gap between the drive shaft 4 and the cylindrical portion 13 and the gap between the labyrinth seals 14. It is fed into the hollow chamber 12 and heats the entire inner surface from the inner surface of the stirring tank 2 to the inner surface of the hollow chamber 12, and then continues heating while opening the on-off valve 15 a and discharging from the steam outlet 15. Since the steam emitted from the steam outlet 15 passes through the upper part of the hollow chamber, the lower surface of the lip seal 10 and the upper surface of the hollow chamber can be sufficiently heated and sterilized. Next, when the on-off valve 15a is closed and the on-off valve 16a is opened, the steam flows along the bottom surface of the hollow chamber 12, heats the bottom surface better, and wears powder 17 of the lip seal 10.
Can be discharged from the foreign matter discharge port 16 with this, the abrasion powder 17 is removed from the hollow chamber 12, and is prevented from falling to the stirring tank 2 side.

Although the vacuum stirrer has been described above, the present invention can also be applied to a closed stirrer that stirs in a pressurized state.

[0013]

As described above, according to the first aspect of the present invention, when the steam outlet is opened and the foreign matter outlet is closed, the steam that has entered the hollow chamber reaches the upper steam outlet up to the upper steam outlet. Flow along the lip seal, the lower surface of the lip seal and its vicinity can be sufficiently sterilized, and when the steam outlet is closed and the foreign matter outlet is opened, the abrasion powder falling on the bottom of the hollow chamber flows out together with the steam. The effect that can be made to play is produced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part.

[Explanation of symbols]

1 vacuum stirrer 2 stirring tank
4 Drive shaft 6 Bearing part 7 Shaft sealing part 1
0 Lip seal 12 Hollow chamber 13 Tube part 14
Labyrinth seal 15 Steam outlet 16 Foreign matter outlet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinyasu Horiuchi 8-16-43 Ebie, Fukushima-ku, Osaka-shi, Osaka Prefecture (72) Inventor Taku Nishikata 8-- Ebie, Fukushima-ku, Osaka-shi, Osaka 16-43 F-term in Tokushu Kika Kogyo Co., Ltd. (reference) 3J042 AA04 AA12 BA01 CA10 DA09 3J043 AA16 BA08 CA02 HA04 4G037 DA02 EA02 4G078 AA13 AB09 AB20 BA03 CA15 EA20

Claims (1)

[Claims] 1. An opening is provided on the upper surface of a stirring tank, a shaft sealing portion and a bearing portion are sequentially mounted on the opening, and a driving shaft rotated by a motor is supported by the bearing portion to form a periphery of the shaft sealing portion. A shaft is sealed with a face seal member, a lower end of the shaft is connected to a stirring shaft with the lower end facing the inside of the stirring tank, and a housing having a hollow chamber surrounding the drive shaft is provided below the shaft sealing portion, and a labyrinth is provided below the hollow chamber. In a closed stirrer that provides a seal and an outlet, seals the stirring tank, stirs the material, introduces high-temperature steam into the stirring tank, and sterilizes
A shaft seal portion of a closed stirrer, wherein the housing is provided with a steam outlet communicating with an upper part of the hollow chamber and a foreign substance outlet communicating with a lower part of the hollow chamber, and an opening / closing valve is attached to each outlet.