JPH0229313Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention improves the mechanical seal that seals the rotating shaft of the aircraft, especially the fixed ring used to mount the maintaining ring inside the seal cover. Regarding mechanical seals.

[Prior art and its problems]

Generally, a rubber material is used as a fixed ring to which a maintaining ring of a mechanical seal is attached.

However, in conventional fixed rings of this type, even if there is a difference in the required function between the part where permanent compressive strain works and the part where it does not work depending on the fluid to be sealed and the temperature of that fluid, the required function is met. There was a problem that it was impossible to select the right rubber material, which resulted in a decrease in sealing performance.

[Purpose of invention]

The present invention was developed under the above circumstances, and its purpose is to use special rubber that satisfies the required functions for the fixed ring that attaches the maintaining ring to the seal cover. An object of the present invention is to provide a mechanical seal with improved sealing performance.

[Means for solving problems]

In order to solve the above problems, this invention
In a mechanical seal having a structure in which a mating ring is airtightly fixed within a seal cover via a fixed ring, the fixed ring has a highly heat-resistant foot that is in pressure contact with the mating ring inside a metal reinforcing ring. It is formed by baking a special rubber such as acrylic rubber or nitrile rubber with low compression set, which is in pressure contact with the seal cover on the outside,
The end portion of the reinforcing ring is configured to protrude and be exposed from the baked rubber material.

[Effect]

That is, in the present invention, the fixed ring interposed between the mating ring and the seal cover has good elasticity due to the special rubber such as acrylic rubber or nitrile rubber having a small compression set on the side in contact with the seal cover. In addition, a highly heat-resistant fluorocarbon rubber is provided on the side that comes into contact with the mating ring, which generates heat due to sliding, to increase resistance to the heat from the mating ring. The structure is such that the heat propagated to the reinforcing ring is released from the end of the metal reinforcing ring that protrudes and is exposed from the rubber material, thereby preventing the special rubber from deteriorating due to heat.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

As shown in FIG. 1, numeral 1 in the figure is a fixed ring used in the mechanical seal according to the present invention. This fixed ring 1 is formed by baking two different types of first and second rubber materials 3 and 4 on both the inner and outer circumferential surfaces of a reinforcing ring 2 made of metal.
Both ends of the rubber materials 3 and 4 protrude and are exposed to the outside.

That is, as shown in FIG. 2, the fixed ring 1 is used to attach the maintaining ring 7 to the inner periphery of the seal cover 6 on the periphery of the rotating shaft 5 of the machine body, and is in contact with the seal cover 6. The first rubber material 3 on the outer periphery is made of special rubber such as acrylic rubber or nitrile rubber with low permanent compression strain, while the second rubber material 4 on the inner periphery in contact with the maintaining ring 7 is made of It has a structure made of special rubber such as plain rubber.

[Effect of idea]

As is clear from the above description, according to the present invention, as the rubber material of the fixed ring interposed between the mating ring and the seal cover, a special rubber with low compression set is used on the side in contact with the seal cover, and Highly heat-resistant fluorocarbon rubber is used on the side that contacts the mating ring that generates heat due to sliding, and the heat propagated to the metal reinforcing ring through the fluorocarbon rubber is transferred to the end of the reinforcing ring. Since the special rubber is not deteriorated by heat, it has the excellent effect of being able to maintain good sealing and cushioning properties over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional view of a fixed ring used in a mechanical seal according to the present invention, and FIG. 2 is a schematic half-sectional view of an essential part showing an embodiment of the structure of a mechanical seal equipped with a fixed ring. DESCRIPTION OF SYMBOLS 1... Fixed ring, 2... Reinforcement ring, 3... First rubber material, 4... Second rubber material, 5... Rotating shaft,
6... Seal cover, 7... Maintaining ring.

Claims (1)

[Scope of utility model registration request] In a mechanical seal having a structure in which a mating ring is airtightly fixed within a seal cover via a fixed ring, the fixed ring has a highly heat-resistant foot that is in pressure contact with the mating ring inside a metal reinforcing ring. It is formed by baking raw rubber and a special rubber such as acrylic rubber or nitrile rubber with low compression set that is in pressure contact with the seal cover on the outside, and the end of the reinforcing ring protrudes and is exposed from the baked rubber material. A mechanical seal featuring: