CN1303010A - Device and method for detecting oil pollution - Google Patents

Abstract

A method for detecting oil pollution includes continuously scanning the dynamic oil specimen by stable parallel laser beams; after photoelectric conversion, sending all voltage values to microcomputer for statistics, and calculating the quantity and kinds of solid pollutants in unit weight or volume. Its device consists of oil channel with radial hole, laser, photoelectric converter, amplifier and counter. Its advantages are high speed and high correctness.

Description

Oil contamination pick-up unit and detection method

The present invention relates to a kind of test fluid component that is used for, particularly be suitable for detecting the device of contained solid pollutant component in hydraulic oil or the lubricating oil system.

Oil contamination typically refers to mixes the impurity that other component is arranged in oil; include the metal or the non-metallic particle impurity of solid; gas or liquid impurity; wherein solid impurity is the most serious to the mechanical wear that causes because of oil contamination; can account for total more than 90% of wear extent of machinery according to statistics; so it is the indispensable means that protection equipment runs well that solid impurity in the oil is carried out conventional sense.

In the prior art, the method that is used to detect oil contamination mainly contains two kinds, i.e. gravimetry and microscopic analysis.Wherein, gravimetry is that the sample oil of getting certain volume is filtered into print with it, then print is weighed, and draws the weight of pollutant, compare with ISO grade code again, and then the pollution level of definite sample oil.Though this kind method equipment needed thereby is simple, it can not directly reflect fuel-displaced endocorpuscular kind, and the running time is longer; Microscopic analysis is the value volume and range of product that sample oil is placed on impurity in the microscopically Direct observation sample oil, when statistical magnitude, select several zonules as detecting unit earlier, obtain the mean value of impurity in each zonule then, extrapolate total amounts of particles again, perhaps direct and standard sample of photo compares, and extrapolates oil contamination grade or degree again.This kind method depends on operating personnel's experience to a great extent, so error is very big, can not reflect the truth of oil contamination quickly and accurately.

Task of the present invention provides a kind of oil contamination pick-up unit and detection method, and these apparatus and method can detect the value volume and range of product of contained solid particle in the sample oil easily, rapidly and accurately, and can display it.

For finishing above-mentioned task, the passage that device proposed by the invention crosses sample oil spontaneous current when having the online or offline inspection sample oil of confession, and be provided with the radial hole of making by transparent material at this passage position that attenuates; With a laser instrument, it can pass the laser beam that it sent above-mentioned radial hole and be arranged on the photoelectric conversion part accepting above-mentioned laser beam and the light variable is converted to electric variable of being used to of radial hole opposite side; An and amplifier element that joins with the photoelectric conversion part output terminal and comprise the counter of at least two passages, with one be used for measuring exactly the sample oil volume that flows through above-mentioned oily passage or the measuring apparatus of weight, and the output terminal of counter and measuring apparatus all joins with the input end of microprocessor.

The data that described microprocessor calculates can be by the display or the printer output of joining with its output terminal.

Described electric converting member can be made of photodiode.

Described measuring apparatus comprises the piston of a conduction and is arranged on the electrode of this device top and bottom.

Detection oil contamination method proposed by the invention comprises the following steps:

With stable collimated laser beam dynamic sample oil is carried out continuous sweep, will convert electric variable to through the light variable that is produced behind the sample oil;

Above-mentioned electric variable is amplified the back classifies randomly according to the size of its voltage magnitude, and voltage magnitude of all categories sent in the microprocessor add up, converting the above-mentioned weight or volume that flows through the sample oil of laser beam to electric signal simultaneously also sends in the microprocessor, calculate the value volume and range of product of solid pollutant in unit weight or the volume by microprocessor, and with this result's output.

Scan with the sample oil of parallel laser beam continuous flow in the passage, as long as have solid particle will produce the light variable in the oil, and according to the amplitude of this light pulse voltage that variable produces, can calculate the size and the quantity of above-mentioned solid particle automatically, so, not only detection speed is fast especially with device that this method is made, and testing result is very accurate; It also can be used for online detection simultaneously, can monitor oil circulating system randomly, and operating process is quite simple, and used cost is very low.

Below in conjunction with drawings and Examples invention is elaborated.

Accompanying drawing 1 is a surface structure cut-away section synoptic diagram of the present invention;

Accompanying drawing 2 is the detection system schematic diagrams among Fig. 1.

Referring to Fig. 1, this device comprises a casing 1, is provided with photoelectric conversion device 2 and measuring apparatus 3 in this casing, and its top is provided with Test Switchboard 11, the oil supply hole 12 of sample oil and oil outlet 13, and printer 5.No matter be online or offline inspection, all the output terminal and the oil-in 12 of online or off-line detection device can be joined, can realize online or offline inspection, its testing result can be by display 6 or printer 5 outputs.

Referring to Fig. 2, it provides the schematic diagram of whole detection system.Its photoelectric conversion device 2 comprises a housing 21, be provided with the tapered passage 22 that sample oil is flow through of being used in middle part in this housing, and in the appropriate location of passage 22, preferably the thinnest zone, middle part be provided with one with the perpendicular light hole of making by transparent materials such as glass sheet 23 of this passage.Side at housing 21 is equipped with a laser instrument 24, and it can send parallel laser beam, and opposite side is equipped with a photoelectric conversion part 25, and the collimated laser beam that laser instrument 24 is sent can pass above-mentioned light hole 23, shines on the photoelectric conversion part 25.When sample oil from top to down flows into oily passage 22, as particulate contaminants being arranged and in the oil when flowing through the moment of light hole 23, will make parallel beam produce a light variable by light hole 23, this moment, photoelectric conversion part 25 converted the light variable to electric impulse signal, can calculate the size and the quantity of this contamination particle according to the spoke value of this electric impulse signal.Its computing method can be by following formula:

EO=a×Eb\A

Wherein: EO represents the pulse voltage amplitude that solid particles produces;

A represents the projected area of solid particle;

Output voltage when Eb represents not have solid particle;

A represents the solid particle projected area.

As can be seen, pulse voltage amplitude is directly proportional with the projected area of solid particle from above-mentioned formula, only requires to such an extent that voltage magnitude just can be obtained the size of solid particle, and the quantity that produces pulse voltage is the quantity of solid particle.

Photoelectric conversion part 25 can be made of photodiode, and its output terminal joins with counter 28 by amplifier 26 and voltage comparator 27 again.Counter 28 comprises two passages at least, four passages preferably, and it can distinguish four kinds of contamination particles that differ in size like this.

Give the outward appearance cross-section structure of measuring apparatus 3 among Fig. 2, as can be seen, this device comprises the piston 31 of a conduction, and is provided with electrode 32 at an upper portion thereof and at a lower portion thereof.When oil when the oil supply hole 33 of measuring apparatus 3 is gradually in ground flows into it, piston 31 increases along with the volume of oil-feed and little by little to lower slider, when piston 31 was contacted with the electrode 32 of bottom, metering process was finished, and the volume in the measuring apparatus 3 promptly is the volume of sample oil.Be sent to this volume numerical value in the microprocessor 4 this moment, and microprocessor can calculate the value volume and range of product of this volume internal contamination particle exactly, and its result of calculation can be by display 5 or printer 6 outputs.

Claims (5)

1. use the oil contamination pick-up unit for one kind, it is characterized in that having:

The passage that during the online or offline inspection sample oil of confession sample oil spontaneous current is crossed, and be provided with the radial hole of making by transparent material at this passage position that attenuates;

A laser instrument, it can pass the laser beam that it sent above-mentioned radial hole and be arranged on the photoelectric conversion part accepting above-mentioned laser beam and the light variable is converted to electric variable of being used to of radial hole opposite side;

An amplifier element that joins with the photoelectric conversion part output terminal and comprise the counter of at least two passages, with one be used for measuring exactly the sample oil volume that flows through above-mentioned oily passage or the measuring apparatus of weight, and the output terminal of counter and measuring apparatus all joins with the input end of microprocessor.

2. device according to claim 1 is characterized in that: the data that described microprocessor calculates can be by the display or the printer output of joining with its output terminal.

3. device according to claim 1 is characterized in that: described electric converting member can be made of photodiode.

4. device according to claim 1 is characterized in that: described measuring apparatus comprises the piston of a conduction and is arranged on the electrode of this device top and bottom.

5. one kind is detected the oil contamination method, it is characterized in that comprising the following steps:

With stable collimated laser beam dynamic sample oil is carried out continuous sweep, will convert electric variable to through the light variable that is produced behind the sample oil;

Above-mentioned electric variable is amplified the back classifies randomly according to the size of its voltage magnitude, and voltage magnitude of all categories sent in the microprocessor add up, converting the above-mentioned weight or volume that flows through the sample oil of laser beam to electric signal simultaneously also sends in the microprocessor, calculate the value volume and range of product of solid pollutant in unit weight or the volume by microprocessor, and with this result's output.

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