JPS6243184Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sealing device that combines a counter face that is fitted onto a rotating shaft and a sealing member that makes sliding contact with the counter face, and more specifically, the present invention relates to a sealing device that combines a counter face that is fitted onto a rotating shaft and a sealing member that makes sliding contact with the counter face. It is about improvement.

A detailed description will be given below with reference to the drawings.

Conventionally, many structures as shown in FIG. 1 have been proposed as this type of sealing device. That is, a flange 2 is formed at one end of a rubber seal A that is fitted onto a rotating shaft 1 that requires sealing, and an annular contact ring 3 is attached to the side of the flange 2 to be integrated with the rubber seal A. A sealing device is constructed by fitting a sealing member that comes into sliding contact with the housing 4 into the housing 4.

However, in the above sealing device, the rubber seal A is simply attached to the rotating shaft 1 and does not have a firm fixing means, so that the impeller 5 that is press-fitted onto the rotating shaft 1 against the load of the spring 6 in the axial direction, etc. It must be received and fixed by another member such as an end face, and therefore the distance between the housing 4 and the end face of the impeller 5 is affected by the axial length of the mechanical seal, and the shape of the end face of the impeller 5 that the flange portion 2 presses against. It had many drawbacks, such as being limited and requiring high precision.

The present invention eliminates these drawbacks and provides an ideal mechanical seal with high sealing performance.

As shown in FIG. 2, the mechanical seal of the present invention includes an annular contact ring 3 as a component of the counterface, and a rubber packing A that fits the contact ring 3 and tightly contacts the rotating shaft 1. It has a structure in which a washer B that can be press-fitted onto the rotating shaft 1 and fixed thereto is inserted into the rubber packing A.

With this structure, as shown in FIG. 2, unlike the conventional mechanical seal which is fixed by other members such as the impeller 5, the mechanical seal can be assembled and sealed by itself. That is, after assembling the sealing member including the friction ring 7 and the spring 6 to the housing 4 or the bearing 8, the contact ring 3 is fitted and the counter face consisting of the rubber packing A with the washer B inserted therein is attached to the rotating shaft. When the rotating shaft 1 and the housing 4 or the bearings are press-fitted and their sliding surfaces are brought into pressure contact with each other, the space between the rotating shaft 1 and the housing 4 or between the bearings is sealed. At this time, the inner diameter of the washer B inserted into the rubber packing A is the rotation axis 1.
Since it is provided with a diameter that should be press-fitted to the contact ring 3, after insertion, the rubber packing A is firmly held without moving due to the load of the spring 6 or the fluid load of the liquid, and the contact ring 3 is also held in place. do. Therefore, an independent sealed body can be formed without the aid of other members, and a high degree of versatility can be achieved. Note that the washer B can be fitted by forming the inner diameter of the washer B to be slightly smaller than the diameter of the rotating shaft 1 and press-fitting it, or by inserting the counter face and then inserting the washer B or the rotating shaft 1. There are many fixing methods such as caulking and fixing, and as shown in Fig. 3, a cylindrical part 9 that can be press-fitted into the rotating shaft 1 and has a shape that hugs the rubber packing A and the contact ring 3 is provided in continuity with the washer B. When the counter face with washer B provided with the cylindrical portion 9 is fitted onto the rotating shaft 1, the washer B provided with the cylindrical portion 9 holds the rubber packing A and the contact ring 3 with high precision and provides more stable sliding. This allows for more secure fixation as well as motion.

The fact that a single mechanical seal can be assembled to a part that requires sealing in this way means that it is completely unaffected by dimensional errors such as flatness and perpendicularity of other parts, and provides optimal contact for sealing at each sliding part. It provides high pressure and ensures high sealing performance, and fundamentally eliminates sealing failures caused by unstable sliding caused by rotational vibration of the impeller 5.

As explained above, the present invention is a sealing device that can be fixed and sealed by the mechanical seal itself regardless of the processing accuracy of other parts, and is an ideal mechanical seal with high versatility and excellent sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mechanical seal. FIG. 2 is a sectional view of the mechanical seal of the present invention. FIG. 3 is an enlarged sectional view showing another embodiment of the present invention. A...Rubber pads, B...Washers, 1...
...Rotating shaft, 3...Contact ring, 4...Housing, 5...Impeller, 6...Spring, 7
... Friction ring, 9 ... Cylindrical part.

Claims (1)

[Claims for Utility Model Registration] (1) Rotates with either one of the rotating shafts and has smooth sliding surfaces perpendicular to the rotating shaft, and leakage of the sealed fluid occurs due to contact pressure between the two sliding surfaces. In a mechanical seal that prevents the rotation of A mechanical seal characterized by the insertion of a washer. (2) The mechanical seal according to claim 1, wherein the washer has a cylindrical portion that is fitted onto the rotating shaft.