JPH0719553Y2 - Stirrer seal device - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention rotates a rotating shaft in a processing tank.
Rolling to mixing treatment liquid, pulverized relates sheet <br/> Lumpur apparatus stirrer for dispersing treatment.

[0002]

2. Description of the Related Art A stirrer such as a medium disperser has a structure in which a stirring shaft is inserted into a treatment tank and the stirring shaft is rotated by a driving means provided outside the treatment tank. A gland packing, mechanical seal, and other shaft sealing devices are provided to prevent the processing liquid from leaking.

FIG. 3 shows an example of a seal device used in such a stirrer. In the figure, inside a seal case (31) provided on the outer periphery of a rotating shaft (30) such as a stirring shaft, a seal is provided around the rotating shaft (30) through a supply port (32). A ring (34) is fitted so as to form a space (33) in which the liquid circulates, and outer lip seal pieces (35) are provided on both sides of the ring (34).
And inner lip seal pieces (36) are provided, and the tips of the lip seal pieces (35), (36) are in sliding contact with the periphery of the rotary shaft (30). A BC lip seal washer (37) is fitted on the outer side of the outer lip seal piece (35), and the cap (38) is bolted from the side to the seal case (31). Is held by.

With the above-mentioned structure, the product such as slurry, which is transmitted from the inner side (FIG. 3, right side) of the rotary shaft (30), does not leak to the outer side (FIG. 3, left side), but when the operation is continued for a long time. There was a case where the seal piece was worn and the seal liquid leaked inward beyond the inner lip seal piece (36) and was mixed into the product. Also, the sealing liquid leaks into the processing tank.
Since it is not known from the outside even if it is taken out, it is time to replace the seal piece
It is difficult to make a timely decision.

[0005]

[Problems to be Solved by the Invention] The object of the present invention is to provide the agitation described above.
An arrangement of the machine, the seal liquid is to provide a sealing device of the agitator was to be able to exchange timely seal segments <br/> well as to prevent contamination in the product.

[0006]

According to the present invention, one end is in the processing tank.
The other end of the existing rotating shaft is extended to the outside of the processing tank, and the outer lip seal piece on the outer side that is in sliding contact with the rotating shaft on both sides of the ring inserted through the rotating shaft and the processing tank side. an inner lip seal piece provided in the sealing device for shaft sealing by circulating sealing liquid to the space of the lip seal pieces, provided more than the outer lip seal pieces the number of the inner lip seal segments, said seal A sealing device for a stirrer is provided which is characterized in that liquid leakage starts from one side of the outer lip seal , and the above object is achieved.

[0007]

EXAMPLES Examples will be described below. FIG. 1 shows a medium disperser as an example of an agitator to which the present invention is applied. In the figure, a stirring blade (2) is provided in the processing tank (1).
Is provided with a rotary shaft (3) for rotating, and the tip of the rotary shaft extends to the outside of the processing tank and communicates with driving means (not shown) such as a motor. At the outlet of the processing tank (1), there is provided a medium separation device for separating a medium (not shown) such as a ball or a bead so that only the processing liquid passes through. The apparatus shown in the figure uses a gap separator in which a medium is prevented from passing through the stator (4) and the rotor (5), but a screen type or other suitable A device can also be used.

The outlet portion communicates with the processing liquid discharge port (6). At the outlet, an outer cylinder (7) is fitted around the rotary shaft (3), and an inner cylinder (8), a sleeve (9), a holding plate ( 10) is inserted and an O-ring is provided in the proper place.

The sleeve (9) portion is made of a super steel metal material, and a seal casing (11) is screwed to the agitator body so as to surround the outside thereof. The seal case (11) is formed with a flow hole (12) for allowing the seal liquid to flow therethrough, and the flow path (12) communicates with the outer periphery of the rotary shaft (3). A ring (14) is fitted to circulate the seal liquid in the space (13) formed in the space. As shown in FIG. 2, the ring (14) has flanges on both sides, and a plurality of through holes (1
5) is formed, and a projecting edge (16) projects radially inward on the inner side (right side in the figure).

Outer lip seal pieces (17) along the outer (left side of the figure) and inner flanges of the ring (14).
And an inner lip seal piece (18) are provided, and a shoulder portion (2) of the seal case (11) is further inside the inner lip seal piece (18) via a spacer ring (19).
0) and another inner lip seal piece (21). These lip seal pieces (17), (1
8) and (21) respectively extend in the radial direction and their tip portions are
It is curved in the direction of the processing tank and is in sliding contact with the peripheral surface of the sleeve (9) of the rotating shaft (3). The lip seal piece is
It is recommended to use a material with a low coefficient of friction, which is excellent in pressure resistance, temperature resistance, chemical resistance, and wear resistance. It can be made of fluororesin.

A lip seal washer (22) is applied to the outer side of the outer lip seal piece (17), and a cap (23) is screwed onto the seal case (11) to make the lip seal. − Le piece (1
Fix 7), (18) and (21). The lip seal washer (22)
Is the ring compared to the conventional one as shown in FIG.
It projects further inward in the radial direction than the inner diameter of (14) to prevent axial displacement of the outer lip seal piece (17). The axial displacement of the inner lip seal piece (18) is also prevented by the projecting edge (16) of the ring (14).

In the embodiment shown in the figure, the number of inner lip seal pieces is two, and one piece is provided more than the outer lip seal pieces, but the number of these pieces can be made larger than in the above embodiment. . As the seal liquid, an appropriate one such as kerosene or ethylene glycol may be used.

When the operation of the medium disperser is started, the processing liquid (product) such as slurry flowing through the separating device to the outlet side is treated with the lip seal pieces (17), (18), (2
Since 1) is in sliding contact with the rotating shaft (3) and seals the shaft, leakage to the outside is prevented. The sliding surface of the lip seal piece wears little by little, but the tip portion of the lip seal piece moves in the axial direction in accordance with the wear, so that a long time sealing effect is produced and the sealing liquid is leaked. Even if it happens, since the leak is started from one side of the outer lip seal, the mixture of the seal liquid in the product is prevented.

[0014]

[Effect of the Invention] The present invention is configured as described above, and the processing tank
Since the sheets of the inner lip seal piece provided on the side provided more than the outer lip seal piece provided on the outer side, seal supplied between empty between the outer lip seal pieces and the inner lip seal pieces The liquid begins to leak from the outer lip seal piece side even if the lip seal piece wears and leaks.
Mari, at this stage, find a leak of sealing liquid from the outside
Rutotomoni lip can be, so as not to be mixed into the product that
The wear of the seal piece can be detected and the seal piece can be replaced in a timely manner.
Bets can be, can be applied to a medium disperser various other agitator.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of a part of the seal portion.

FIG. 3 is a partially enlarged sectional view of a conventional seal portion.

[Explanation of symbols]

 1 Processing tank 3 Rotating shaft 11 Seal case 14 Ring 17 Outer lip seal piece 18, 21 Inner lip seal piece 22 Lip seal washer

Claims (3)

[Scope of utility model registration request] 1. Rotating in a processing tank so as to process the processing liquid.
Seal case in which the tip of the rotating shaft is provided outside the processing tank
To the outside through the rotary shaft inside the seal case.
The through a hole formed in the ring provided enclose ring to form a space in which the sealing liquid flows, Wanko its tip in sliding contact with the circumferential surface of the rotary shaft to the outer side of the ring on the processing tank side Song
The outer lip seal piece and the treatment of the ring
Sliding around the rotating shaft on the tank side, and the tip of the sliding contact is the processing tank.
An inner lip seal pieces curved on the side provided, the outer Li
The sealing liquid is circulated so as to shaft seal to the space surrounded by Ppushiru piece and the inner lip seal piece, said sealing liquid
The number of inner lip seal pieces should be adjusted so that the leak starts from the side of the outer lip seal pieces. <br />
Sea <br/> Le device stirrer characterized by many provided and than the number of. 2. The seal device for an agitator according to claim 1, wherein the lip seal piece is made of graphite-filled polytetrafluoroethylene. 3. The seal device for an agitator according to claim 1, wherein the outer lip seal washer of the outer lip seal piece is made of polytetrafluoroethylene.