JPH0211653Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a mechanical seal for slurry, and particularly aims to provide a mechanical seal that is easy to assemble.

Conventionally, mechanical seals have been constructed by assembling members between a housing a and a shaft b, each consisting of a housing side assembly c provided on the housing a side and a shaft side assembly d provided on the shaft side, as shown in Fig. 1. However, since both assemblies are separate bodies, there are problems such as not only requiring an assembly jig but also requiring time and effort when assembling the two assemblies. Furthermore, since the sliding portion of the conventional mechanical seal is exposed, the slurry comes into direct contact with the seal, resulting in a shortened seal life.

This invention was devised to eliminate the above drawbacks and provide a mechanical seal that is easy to assemble and has a long life.The entire mechanical seal is made into a unit to simplify assembly, and the slurry can be directly It has a structure that does not contact the mechanical seal.

Hereinafter, embodiments of the mechanical seal of the present invention will be described with reference to the drawings. Fig. 2 shows the first embodiment, and shows a state in which the mechanical seal of the present invention is incorporated. Mechanical seal assembly 1 is shaft 1
an inner case 5 which is a rotating case fixed to 7;
Inside the inner case 5, there is a shaft side assembly section 4 which is composed of a floating seat 14 which is attached via a buffer rubber 13 which is a rotating side buffer ring, and which is attached to a housing 15 via a buffer rubber 16. an outer case 2 which is a case member, and a floating seat 8 attached to the outer case 2 via a buffer rubber 7 which is a fixed side buffer ring.
It has a housing side assembly part 3 consisting of.

The outer case 2 has a cylindrical portion extending to cover the inner case 5, and the tip of the cylindrical portion is bent inward to form an inner edge 9. Since the inner diameter of this inner edge 9 is smaller than the outer diameter of the inner case 5, the inner case 5 and the outer case 2 are engaged in the axial direction before assembly.
The two will never be separated. The inner case 5 has a radial part 11, an outer peripheral part 10, and an inner peripheral part 12.
A shaft 17 is fixed via a cushioning rubber 16.

In addition, rubber dust seals 19 and 20 are provided on the inner periphery of the tip portion of the outer case 2 and the outer periphery of the outer periphery of the inner case 5, respectively, in mutually opposing proximity to each other. This makes it difficult for solids in the slurry to penetrate.

Similarly, the second embodiment shown in FIG. 3 is designed to prevent slurry etc. from directly hitting the sliding surface, and is applied to the outer periphery 10 of the inner case 5 facing the inner periphery of the tip of the outer case 2. This is a screw seal in which a screw 21 is threaded and generates a threading effect in the axial direction as the screw 21 and the outer case 2 rotate relative to each other, and the sealing effect is exerted by the rotation of the shaft 17. However, a large amount of solid matter in the slurry will not enter and hit the floating sheets 8, 14, causing damage.

As mentioned above, in this invention, the housing side assembly including the floating seat and the shaft side assembly are assembled in advance and configured as one mechanical seal assembly, so it is easy to integrate it between the housing and the shaft. It has the feature that assembly work can be done in a short time. Since the case member has a cylindrical part that covers the rotating case, the floating seat and the buffer ring are surrounded by the case member and the rotating case, and are also surrounded by the cylindrical part of the case member. A non-contact duct sheet is provided between the opposing surfaces of the rotating case to prevent solids from entering, so solids in the slurry can collide with the floating sheet or buffer ring at high speed and damage them. I have never put it away. Therefore, the mechanical seal of the present invention has excellent durability.

[Brief explanation of drawings]

FIG. 1 is a half-cut sectional view showing a conventional mechanical seal, and FIGS. 2 and 3 are half-cut sectional views showing an embodiment of the mechanical seal of the present invention. 1... Mechanical seal assembly, 2... Outer case, 3... Housing side assembly section, 4... Shaft side assembly section, 5... Inner case, 7, 13, 16...
Buffer rubber, 8, 14...Floating sheet,
9...Inner edge, 15...Housing, 17...Shaft, 19, 20...Dust seal, 21...Screw.

Claims (1)

[Scope of utility model registration request] A fixed floating seat attached to the housing via a fixed side buffer ring, a rotating case rotating together with a rotating shaft, and a rotating floating seat attached within the rotating case via a rotating side buffer ring, In a mechanical seal in which both floating sheets slide closely between their end surfaces to seal the fluid on the outer peripheral side, the fixed floating sheet is installed in a case member attached to the housing via the fixed side buffer ring, The case member has a cylindrical part that covers the rotating case, and the tip of the cylindrical part is bent inward so as to engage with the rotating case in the axial direction, and the cylindrical part is connected to the rotating case. A mechanical seal characterized by a non-contact dust seal between opposing surfaces.