JPH0247321Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a mechanical seal that seals the rotating shaft of a machine body such as a water pump.

[Prior Art] Conventionally, this type of mechanical seal, especially a fluid mechanical seal, has a fixed ring fixed to the housing 1 side of the machine body via a cap gasket 2, as shown in FIG. The rotary shaft 4 is inserted through the mating ring 3, and a seal ring 5, which is a rotary ring that rotates together with the rotary shaft 4, is elastically pressed and brought into sliding contact with the mating ring 3. 5 has an integral structure with a rubber bellows 6 that is in close contact with the rotating shaft 4, a casing 7 on its outer periphery, and a drive ring 8, and is further provided with an urging force of a coil spring 10 inserted between a spring suppressing member 9. By elastically pressing the rotating shaft 4
Some devices have a structure that prevents fluid from leaking from the side to the outside.

[Problems to be solved by the invention] However, in the mechanical seal of such a conventional structure, the so-called main body rotation type mechanical seal, the rubber bellows 6 that transmits the rotation of the rotating shaft 4 to the seal ring 5 is Since it is designed with a bent part 6a to withstand pressure from the back side, it is used in places where pressure is applied from the rotating shaft 4 side as described above, that is, where reverse pressure is applied. In some cases, the rubber bellows 6 is easily deformed, which causes damage to the rubber bellows 6 and causes leakage of sealing fluid.

[Purpose of the invention] The present invention was made under the above circumstances, and its purpose is to provide a mechanical seal that can reliably prevent damage to the rubber bellows due to back pressure. It's about doing.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
A rotating ring that rotates together with the rotating shaft is elastically pressed and urged into sliding contact with a fixed ring fixed to the housing side of the aircraft body, and a rubber bellows is provided for transmitting the rotation of the rotating shaft to the rotating ring. In the mechanical seal, the back side of the rubber bellows is integrally reinforced with a reinforcing member.

[Function] In other words, in the present invention, with the above configuration, the reinforcing member is integrally provided on the back side of the rubber bellows for reinforcement, so that the pressure from the rotating shaft side is applied to the rubber bellows. Even if the rubber bellows is subjected to a It becomes possible to maintain sealing performance over a period of time.

[Example] Hereinafter, the present invention will be described in detail with reference to an example shown in FIG. In the illustrated embodiment of the present invention, parts having the same structure as the conventional mechanical seal shown in FIG. 2 are denoted by the same reference numerals, and a description thereof will be omitted.

That is, as shown in FIG.
A structure in which a reinforcing member 11 made of synthetic resin or the like is integrally added and reinforced, and the reinforcing member 11 is made of synthetic resin or the like and has a shape that is approximately the same as the shape of the bent portion 6a formed on the back side of the rubber bellows 6 that transmits the rotation of the rubber bellows 6 to the seal ring 5. This makes it possible to prevent the rubber bellows 6 from deforming due to pressure from the rotating shaft 4 side.

It should be noted that the present invention is not limited to the above-described embodiments in any way, and it goes without saying that various modifications can be made without changing the gist of the present invention.

[Effects of the invention] As is clear from the above explanation, according to the present invention, the fixed ring fixed to the housing side of the fuselage
In a mechanical seal equipped with a rubber bellows that elastically presses and urges a rotating ring that rotates together with a rotating shaft into sliding contact and transmits the rotation of the rotating shaft to the rotating ring, the back side of the rubber bellows is provided with a reinforcing member. Since the rubber bellows is integrally reinforced with the rubber bellows, even if pressure from the rotating shaft side is applied to the rubber bellows, the reinforcing member can prevent the rubber bellows from deforming, which may lead to damage such as tearing of the rubber bellows. As a result, leakage of the sealing fluid does not occur, and the sealing performance can be maintained for a long period of time, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a main part showing an embodiment of a mechanical seal according to the present invention, and FIG. 2 is a schematic cross-sectional view of a main part showing a conventional mechanical seal. 1... Body housing, 3... Fixed ring (mating ring), 4... Rotating shaft, 5... Rotating ring (seal ring), 6... Rubber bellows, 6a...
Back side (bent part), 9...spring suppressing member,
10... Coil spring, 11... Reinforcement member.

Claims (1)

[Scope of claims for utility model registration] (1) A fixed ring fixed to the housing side of the fuselage,
In a mechanical seal equipped with a rubber bellows that elastically presses and urges a rotating ring that rotates with a rotating shaft into sliding contact and transmits rotation of the rotating shaft to the rotating ring, the back side of the rubber bellows is reinforced. A mechanical seal characterized by being integrally reinforced with other parts. (2) The mechanical seal according to claim 1, wherein the reinforcing member is made of a synthetic resin material that has the same shape as the back surface of the rubber bellows.