JPS62115342A - Measuring instrument for water in oil - Google Patents

Abstract

PURPOSE:To obtain a measuring instrument which can make online measurement of the intrusion of water into oil by measuring the quantity at which the intensity of the light transmitting the oil is attenuated by the water. CONSTITUTION:The part including collimating lenses 3, 5 of the measuring instrument is held immersed in the oil to be measured. The light which is emitted from a light source 1 in this state and is emitted from the lens 3 via an optical fiber 2 transmits the oil and is attenuated by the water. The attenuated light is condensed by the lens 5 and is passed via the optical fiber 4 to a photodetector 8 by which the light is photoelectrically converted. On the other hand, the light passing the optical fiber 6 is photoelectrically converted by a photodetector 7 without being attenuated by the oil. The optical fiber 6 runs the same route as the optical fibers 2, 4 and has the function to correct the fluctuation in the quantity of light by the deformation and oscillation of the optical fibers. The signals converted by the photodetectors 7, 8 are calculated by a calculator 9, by which the water in oil is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for detecting moisture in oil, particularly to detecting finely dispersed moisture.

[Conventional technology]

When equipment that uses oil, especially equipment that uses oil to lubricate rotating parts, is used in an atmosphere where the outside of the equipment comes into contact with water, it is important to detect moisture that may have entered due to deterioration of the seals at an early stage and operate the equipment. Stopping is very important to prevent accidents. The moisture mixed in oil can be measured by sampling the oil while the rotation is stopped and using a moisture-in-oil measuring device (Karl Fischer method, etc.). However, it is not appropriate to collect oil from operating equipment, and even in that case it takes time to obtain results, so there was a need for a method that could detect oil online.

Conventionally, attempts have been made to, for example, install electrodes in oil and detect moisture in oil from changes in electrical resistance or capacitance.

[Problem that the invention seeks to solve]

Conventional methods lack the sensitivity to detect moisture in Oak, and by the time moisture is detected, the seal has already deteriorated.
The situation was such that they were unable to fulfill their protective role.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide an oil moisture measuring device that can detect moisture intrusion online at a level that can sufficiently protect the seal portion.

[Means for solving problems]

The water-in-oil measuring device according to the present invention emits light from a light source through an optical fiber and a first collimating lens into the oil. It is possible to detect small amounts of moisture in oil using an optical method ξ that leads to a photoelectric converter.

[Effect]

Detection of moisture in oil in this invention is achieved by measuring the amount by which light passing through the oil is attenuated by the moisture.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) is the light source, (2) is the first optical fiber, (3) is the collimating lens placed at the tip of the first optical fiber, (4) is the second optical fiber, and (t6) is the first optical fiber. Collimating lens with two optical fiber tips 1ζ arranged (6
Moon, third optical fiber, (7) (a) is the photodetector, (
9) is an arithmetic unit for photoelectrically converted electrical signals.

In FIG. 1, the part including both collimating lenses (3) and (5) is immersed in the oil to be measured. In this state, the light emitted from the collimating lens (3) passes through the oil, is attenuated by moisture, is focused by the collimating lens (5), and is photodetected by the photodetector (7) via the optical fiber (4). On the other hand, the light passing through the optical fiber (6) is photoelectrically converted by the photodetector (8) without being attenuated by the oil. 4)
The light i passes through the same path as the deformation and vibration of the optical fiber.
It has a function to correct 11 movements. Photodetector (7)
(No. 1 converted in (8) is calculated by a computing unit (9) to detect moisture in oil.

FIG. 2 is a diagram showing an example of wavelength characteristics of water content in oil and light transmission rate. Figure 2 shows that as the water content in oil increases, the overall light transmittance decreases under the same state of deterioration.
This shows that as oil deterioration progresses, the rate of decrease in light transmittance increases on the shorter wavelength side when the water content is the same.

FIG. 8 is a diagram showing the relationship between moisture and light transmittance at the wavelength shown at point A in FIG. In FIG. 8, the solid line μQ represents a measurement example of oil with little deterioration, and the dotted line represents a measurement example of oil with progressing deterioration. When the state of deterioration is the same, it is possible to detect moisture using one type of moisture-light transmission characteristic; however, when the state of deterioration is different, the moisture-light transmission characteristic differs, so the moisture-light transmission characteristic of the polar type is detected. This shows that an error occurs if only this value is used.

In the present invention, improvement of point B: using the light transmittance at this point,
It is characterized by correcting changes in moisture-light transmission characteristics due to oil deterioration.

In FIG. 8, 1ζ, if the light transmission rate is YIliltl and the water content in oil is the X axis, then the relationship of (υ equation) can be approximately obtained.

Y=C-1Jx・・・・・・・・・・・・・・・・・・
(l) Here, C is the light transmittance when the moisture in the oil is 0 (zero), and V is the slope showing the change in the light transmittance due to the moisture in the oil. This shows that the C2D inside is different.

Figure 4 shows the relationship between the light transmittance (C) and the degree of oil deterioration when the water content in the oil is O, and Figure 5 shows the relationship between the value corresponding to 0 in the equation (0) and the degree of oil deterioration. FIG.

FIG. 6 is a diagram qualitatively showing the relationship between the light transmittance and the degree of oil deterioration at the wavelength of point A and the wavelength of point B in FIG. 2.

When detecting moisture in oil, from the relationship obtained in Figure 6, Figure 4,
The relationship shown in Figure 5 is corrected by calculation to remove the influence caused by oil deterioration. In other words, by applying and correcting the increase in the ratio of passage rate depending on the progression of deterioration i in Figure 6 to Figures 4 and 5, the detection accuracy of moisture in deteriorated oil (also here) can be improved. can be kept.

FIG. 7 shows another embodiment of the part immersed in oil. In this figure, (2) to (5) indicate the same things as in FIG. The fourth is the reflected view, and the mouth is the gap. In the figure, both collimating lenses (3) (6) and reflective lens (2) are shown.
They are placed with a gap between them, and during this time oil moves through the pipe. The operation of the configuration 9 is the same as that of the embodiment shown in FIG.

〔Effect of the invention〕

As described above, the present invention has a configuration in which the phenomenon in which the intensity of light passing through oil is attenuated by moisture in the oil is detected via an optical fiber, so that on-line measurement is possible.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a water-in-oil measuring device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the wavelength characteristics of water-in-oil and light transmittance, and Fig. 8 is a diagram showing the water-in-oil and the wavelength characteristics of light transmittance. Figure 4 is an explanatory diagram showing the relationship between light transmittance and oil deterioration. Figure 4 is an explanatory diagram showing the relationship between light transmittance at zero moisture and the degree of oil deterioration. Figure 6 is an explanatory diagram showing the relationship between the degree of inferiority and the light transmission rate at the wavelength of point B in Figure 2 and A.
FIG. 7 is an explanatory diagram showing the relationship between the ratio of light transmittance at a point wavelength and the degree of deterioration of oil, and FIG. 7 is a sectional view of a portion immersed in oil in another embodiment of the present invention. In the figure, (1) is a light source, (2) (41 is an optical fiber, (7) and (8) are a photodetector (photoelectric converter), and (September) is a thermometer. - The attached number indicates the same or equivalent part. Agent: Masu Oiwa Tsugirod 1 Figure Ichitsuji, text table - 1 Figure 3 Figure 4 Roasted Figure 5 Figure 6 Figure 7

Claims (5)

[Claims] (1) a light source and a first optical fiber that guides light from the light source;
A second optical fiber is disposed facing the first optical fiber and sends the light from the first optical fiber to a photoelectric converter, a converter that photoelectrically converts the amount of light, and a converter that converts the light amount into an electric signal. What is claimed is: 1. A water-in-oil measuring device, comprising: a calculator for calculating water-in-oil based on the amount of water in the oil. (2) In the oil moisture measuring device described in item 1, the first optical fiber and the second optical fiber face a reflecting mirror, and the light emitted from the first optical fiber is reflected by the reflecting mirror and the second optical fiber is reflected by the reflecting mirror. A water-in-oil measuring device characterized by being arranged so that light is focused on an optical fiber. (3) The moisture in oil measuring device according to item 1 or 2, characterized in that collimating lenses are disposed at the tips of the first optical fiber and the second optical fiber. (4) The water-in-oil measuring device according to any one of items 1 to 8, which has light sources with different wavelengths, detects attenuation of light due to water-in-oil with light of a first wavelength; An oil moisture measuring device characterized by detecting the degree of oil deterioration using light of two wavelengths and correcting the influence of oil deterioration. (5) In any of the moisture-in-oil measurement devices described in paragraphs 1 to 8, the first optical fiber and the second optical fiber have the same path, and the light source does not emit light into the oil. Oil moisture measuring device with a third optical fiber that guides the light to the photoelectric conversion section.