JPH03125082A - Mechanical seal - Google Patents

Abstract

PURPOSE:To detect initial abnormality of a mechanical seal by providing a construction made up of the mechanical seal wherein at least either a fixed seat or a rotary ring is made of carbon, a turbidity sensor arranged on a shaft seal chamber or a shaft oscillation liquid pipe line system, and a turbidity display device. CONSTITUTION:When obstruction occurs on a mechanical seal and carbon of a fixed seat 3 or a rotary ring 4 is abnormally abraded, the carbon is dissolved into shaft seal liquid 6 to increase the turbidity of the liquid 6. Output of a turbidity sensor 11 is changed accordingly. When the value thereof exceeds a certain value, a turbidity display device 12 lights an abnormality warning lamp 15 to notice the abnormality occurrence of the mechanical seal. The initial abnormality of the mechanical seal can be detected at the stage where the abnormal abrasion of the fixed seat 3 or the rotary ring 4 starts. Same effect can be obtained when the turbidity sensor 11 is installed on a pipe line 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanical seal that can detect abnormalities at an early stage.

[Conventional technology]

The general structure of a mechanical seal is shown in Figure C.2, 194F, "An example of a mechanical seal (double stationary type)" on page 724 of Chemical Equipment Handbook (1970).

An example of the structure of a conventional mechanical seal is shown in FIG. A fixed member 1!13 and a rotating ring 4 are provided at a portion where the shaft 1 passes through the casing 2. Casing 2, fixed seat 3, and rotation 3! A shaft sealing liquid 6 is filled in a shaft sealing chamber 5 composed of a shaft I4. 0PU (
An oil pressure unit (oil pressure unit) 8 is connected to circulate the shaft sealing liquid 6.

[Problem to be solved by the invention]

In the conventional technology mentioned above, it was normal to detect an abnormality in the mechanical seal based on an increase in the amount of leakage of shaft sealing fluid, but it is said that an increase in the leakage of shaft sealing fluid does not occur until the abnormality of the mechanical seal has progressed considerably. There was a problem. An object of the present invention is to detect an abnormality in a mechanical seal at an early stage of the abnormality.

[Means to solve the problem]

In order to achieve the above object, the present invention measures the turbidity of the shaft sealing fluid, determines the amount of carbon in the shaft sealing fluid, and estimates the wear and tear of the fixed seat or rotating seat. It is.

[For production]

When an abnormality occurs in the mechanical seal, the carbon in the fixed seat or rotating ring wears abnormally and dissolves into the shaft sealing fluid, increasing the turbidity of the shaft sealing fluid. Therefore, by measuring the turbidity of the shaft sealing fluid, abnormalities in the mechanical seal can be detected.

〔Example〕

An embodiment of the present invention is shown in FIG. 1 below. A fixed seat 3 and a rotating ring 4 are provided at a portion where the sleeve l passes through the casing 2. At least one of the fixed seat 3 and the rotating ring 4 is made of carbon. A shaft sealing chamber 5 composed of the casing 2, the fixed seat 3, and the rotating fi4 is filled with a shaft sealing liquid 6. The shaft sealing chamber 5 is filled with an OPU (oil pressure unit) 8 via a pipe 7, and the shaft sealing liquid 6 is circulated therein.

In the present invention, a turbidity sensor 11 is attached to the shaft sealed chamber 5.

Turbidity sensor 11 has turbidity I! L display device! i12 is connected. The turbidity display device 12 includes a turbidity display section 13, a turbidity recording section 14, and an abnormality warning light 15.

The turbidity display device 12 has a circuit that lights up an abnormality warning light 15 when the signal from the turbidity sensor 11 exceeds a certain value.

If an abnormality occurs in the mechanical seal and the carbon in the fixed seat 3 or the rotating ring 4 wears abnormally, the carbon will leak into the shaft sealing fluid 6.
The turbidity of the shaft sealing liquid 6 increases. When the turbidity of the shaft sealing liquid 6 increases, the output of the turbidity sensor 11 changes, and when the value exceeds a certain value, the turbidity indicator W12 turns on the abnormality warning light 15, indicating that there is an abnormality in the mechanical seal. Let us know what has happened.

Thus, according to the present invention, the fixed seat 3 or the rotating ring 4
An abnormality in the mechanical seal can be detected when abnormal wear begins.

Another embodiment of the invention is shown in FIG. In the embodiment shown in FIG. 2, the turbidity sensor 11 is attached to the pipe 7. Other configurations, #! Made by JJ, the effect is! This is the same as the embodiment shown in Figure J1.

In the embodiment of FIGS. 1 and 2, the fixed seat 3 or the rotating 114
One of the materials is carbon, but if carbon is impregnated with paint, the increase in turbidity of the shaft sealing fluid 6 will make a loud noise when an abnormality occurs in the mechanical seal, which will prevent the abnormality of the mechanical seal from occurring. Detection becomes easier.

〔Effect of the invention〕

According to the present invention, it is possible to estimate the amount of carbon wear in the stationary seat or rotating ring by measuring the turbidity of the shaft seal flow, which has the effect that abnormalities in mechanical seals can be detected at an early stage. There is.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views of different embodiments of the present invention, and FIG. 3 is a conventional longitudinal cross-sectional view. l...shaft, 2...casing, 3...
・・・Fixed seat, 4... times @ ring, 5...
・Shaft sealing chamber?・・・・・・Plumbing, 11 years old, 3rd year old

Claims (1)

[Scope of Claims] 1. A mechanical seal in which at least one of the fixed seat or the rotating ring is made of carbon; a turbidity sensor provided on the shaft sealing chamber of the mechanical seal or on the shaft oscillating liquid piping system; A mechanical seal consisting of a turbidity indicator connected to a turbidity sensor. 2. The mechanical seal according to claim 1, wherein the fixed seat or rotary carbon is impregnated with a paint.