JP2006043648A - Sealing device of agitation shaft - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent even a very small amount of contaminants from being mixed in a material to be treated, in a sealing unit of a device, such as a mixer, an agitator, and a dispersing apparatus, having an agitation shaft. <P>SOLUTION: An agitation shaft (10) is rotatably supported in a bearing case (11) by a bearing (12), An upper sealing member (15) and a lower sealing member (16) are provided at an interval between them at the lower side of the bearing (12) and the end parts of both the members (15), (16) are elastically and slidingly contacted to the outer periphery of a sleeve (14) fitted to the agitation shaft (10). A storing part (19) storing foreign matters is formed to the lower side of the lower sealing member (16) and a sucking nozzle (25) is opened at the storing part (19). A sucking passage (26) is opened at a gap part (18) between the upper sealing member (15) and the lower sealing member (16). When a sucking action is caused in the sucking nozzle (25) and the sucking passage (26), the sealing members is got into closely contact with the sleeve to suck and remove the foreign matters. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shaft seal device that seals a stirring shaft for rotating the blade in a mixer, a stirrer, a disperser, and other devices that perform various treatments by rotating the blade in a stirring tank. It is.

A device such as a planetary mixer supports a stirring shaft for rotating a blade in a stirring tank by a bearing such as a ball bearing, and a seal member prevents contamination generated from the bearing portion from affecting the stirring tank. The shaft is sealed (see, for example, Patent Document 1). FIG. 2 shows an example of such a shaft seal device. The stirring shaft (1) is rotatably supported by a bearing (3) such as a ball bearing provided in the bearing case (2), and below the stirring shaft. Seal members (5) and (6) such as a lip seal that are elastically slidably contacted with a sleeve (4) fitted to the shaft (1) are provided, and the seal members (5) and (6) are connected to a seal holder (7). The stirring shaft is sealed by holding the shaft.

  With the above configuration, a normal shaft seal is possible, but when viewed microscopically, there is a possibility that fine contamination may enter the stirring tank. That is, grease is supplied to the bearing, but if the grease leaked from the bearing cannot be reliably sealed by the upper and lower sealing members, the grease may flow downward, and the stirring shaft (1) Between the sleeve and the sleeve (4), metal component fine powder may be generated due to wear, or the seal members (5) and (6) may be worn out to generate rubber component fine powder, which may be mixed in the stirring tank. . Such fine contamination often does not cause a problem in the case of a normal processing material, but in processing processing such as stirring and dispersion of electronic component materials, it may be a problem even with a very small amount.

In the shaft seal portion described in Patent Document 1 above, contaminants flow out together with steam. However, in the case of the processing of electronic component materials as described above, the stirring tank is sealed and the inside of the tank is evacuated to create a negative pressure. Since the processing is often performed in a state, there is a further problem. That is, the evacuation action also affects the seal member, and the tip of the lower seal member (6) in contact with the sleeve tends to be drawn in the direction indicated by the chain line in FIG. There was a risk that the seal would rise due to floating. For this reason, a phenomenon has occurred in which contamination of the processing material is more likely to occur.
JP 2001-87638 A (Claims, FIGS. 1 and 2)

  The problem to be solved by the present invention is that in a shaft seal device of a mixer, a stirrer, a disperser or other equipment having a stirring shaft, even if the processing is performed by evacuating the inside of the stirring tank, contamination of the processing material An object of the present invention is to provide a shaft seal device for a stirring shaft that can reliably prevent mixing.

  According to the present invention, there is provided a shaft sealing device for a stirring shaft in which a stirring shaft extending into a stirring tank is supported by a bearing portion and a sealing member is provided below the bearing portion so as to seal the shaft. An upper seal member located on the bearing side and a lower seal member located on the agitation tank side with a gap between the upper seal member and a foreign matter reservoir portion formed below the lower seal member In addition, a shaft sealing device for a stirring shaft is provided, which is provided with suction means for sucking the pool portion and sucking the gap portion between the upper and lower sealing members, and solves the above problems.

  Since the present invention is configured as described above, a gap is formed between the seal members, a foreign substance reservoir is provided below the lower seal member, and the gap and reservoir are sucked by the suction means. The structure is simple because there is no risk of foreign matter entering the stirring tank and the suction means provided for evacuating the stirring tank can be used. In addition, since the gap formed between the upper seal member and the lower seal member is sucked, when the inside of the tank is evacuated, a force in the direction of pulling toward the stirring tank side acts on the tip of the lower seal member. However, it is possible to apply a force in the direction of pulling to the bearing portion side by a suction action against this force, and the upper seal member is also firmly attached to the stirring shaft, thereby ensuring the tip of each seal member. In addition, it is possible to prevent contamination from entering by slidingly contacting the agitation shaft and removing foreign matter that has entered the gap.

  Further, when the tray that forms the reservoir is provided on the stirring shaft, the tray rotates with the stirring shaft, so that the foreign matter in the reservoir can be sufficiently sucked with the nozzle for sucking the reservoir fixed. Is easy to remove. In addition, if a gap holding means is provided between the upper and lower seal members, there is no possibility that the seal members move and the gaps are blocked when the gaps are sucked, and the gaps can be used for a long time. it can.

  FIG. 1 shows an embodiment in which the present invention is applied to a mixer such as a planetary mixer, and a stirring shaft (10) is rotatable by a bearing (12) such as a ball bearing provided in a bearing case (11). The upper part of the blade (13) is fixed to the lower part that is supported and extends to the stirring tank (not shown).

  The agitation shaft (10) is fitted with a sleeve (14), and an upper seal member (15) and a lower seal member (16) configured by a lip seal or the like so as to elastically slide in contact with the sleeve (14). And is held by a seal holder (17). The upper seal member (15) and the lower seal member (16) are slidably contacted with the sleeve so that the tips thereof are opposite to each other, and a gap is formed between the seal members. The gap portion (18) is formed at an appropriate interval so that air in the gap portion (18) can be sucked by suction means as described later, and gap holding means is provided so that the gap portion is not closed when sucked. Can be provided. As the gap holding means, a member capable of forming a stepped portion on the inner surface of the seal holder to engage with the upper seal member and the lower seal member, respectively, or a member that can ventilate the gap, such as a C-shaped ring or a lantern ring. May be provided.

  Below the lower seal member (16) is formed a reservoir (19) for collecting foreign substances falling from above. In the figure, the reservoir (19) is formed with a ring (21) and an annular flange (22) on the outer periphery of the upper part (20) of the blade to form a tray (23), but the seal holder (17) A saucer can also be formed on the side.

  In the tray (23), a suction nozzle (25) of a suction pipe (24) communicating with a vacuum source (not shown) is opened as suction means. A suction path (26) is formed in the seal holder (17) so as to open into the gap (18), and the suction path (26) and the suction pipe (24) are connected by a suction hose (27). It is. The suction nozzle (25) and the suction path (26) may be connected to a vacuum source through independent paths so that the negative pressure can be individually adjusted (not shown).

  When a suction action is generated in the suction path (26) and the suction nozzle (25) by the suction means, the foreign matters accumulated in the reservoir (19) and the gap (18) can be removed by suction. Further, by sucking the lower seal member (16) from the gap side, the tip of the lower seal member (16) can be prevented from turning toward the stirring tank, and at the same time, the upper seal member (15) is attached to the sleeve ( 14) can be reliably adhered to the outer periphery, and can be reliably sealed.

  Although the said Example demonstrated mixers, such as a planetary mixer, this invention is applicable to a stirrer, a disperser, and other apparatuses suitably.

Sectional drawing which shows one Example of this invention. Explanatory drawing which shows an example of the conventional shaft seal apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stirring shaft 12 Bearing 14 Sleeve 15 Upper seal member 16 Lower seal member 17 Seal holder 18 Gap part 19 Reservoir part 23 Sauce plate 24 Suction pipe 25 Suction nozzle 26 Suction path 27 Suction hose

Claims (3)

  A shaft sealing device for a stirring shaft in which a stirring shaft extending in a stirring tank is supported by a bearing portion and a sealing member is provided below the bearing portion so as to seal the shaft. The sealing member is located on the bearing portion side. A lower seal member located on the stirring tank side with a gap between the upper seal member and the upper seal member, and a foreign substance reservoir is formed below the lower seal member; A shaft seal device for a stirring shaft, wherein suction means for sucking and sucking the gap between the upper and lower seal members is provided.   2. The shaft seal device for a stirring shaft according to claim 1, wherein the foreign substance reservoir is formed by providing a tray on the stirring shaft.   The shaft seal device for a stirring shaft according to claim 1, wherein a gap holding means for holding the gap is provided between the upper seal member and the lower seal member.

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