JP3334120B2 - Oil-filled operation mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-filled operation mechanism for power equipment such as a circuit breaker and a disconnector, and more particularly to rust prevention for an oil-filled mechanical mechanism.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional oil-filled operating mechanism 1 generally comprises a control circuit section 2 such as an electric control circuit, a terminal block and various switches, and a drive mechanism section 3 having a motor as a drive source for opening and closing the equipment. Are housed in the air box 6 side, and the mechanical mechanism unit 4 is housed in the oil mechanism box 7 side and immersed in the lubricating oil 5. The lubricating oil 5 is used so that the mechanical mechanism 4 operates instantaneously and smoothly at the time of opening / closing operation of the equipment.
The bearings and sliding parts are used to lubricate and prevent the occurrence of wear damage and to prevent the mechanical mechanism 4 from rusting. The oil mechanism box 7 containing the lubricating oil 5 is formed in an airtight structure so that the lubricating oil 5 does not deteriorate due to the intrusion of moisture or foreign matter from the outside and cause a problem in the mechanical mechanism unit 4.

[0003]

However, even in the mechanical mechanism 4 immersed in the lubricating oil 5 as described above, rust may be generated due to the following unavoidable factors during long-term operation. There is a problem that the problem described above occurs.
That is, a trace amount of the solvent used when assembling the mechanical mechanism unit 4 and the moisture contained in the lubricating oil 5 or the moisture penetrated by the imperfect airtightness of the oil mechanism box 7 are included in the structural material from the beginning. The metal oxide acts as a catalyst, causing a gradual chemical change over a long period of time to generate corrosive substances such as hydrofluoric acid or carboxylic acid. Is to cause it. This will be described in more detail.

At the time of manufacturing and assembling the above-mentioned mechanical mechanism 4, each metal part is used to remove stains of machining cutting oil and adhered metal powder at the time of machining, and stains of chemicals used for plating of parts. Trichloroethane or HCFC for removal
(A carbide containing hydrogen, chlorine and fluorine) or an alcohol-based solvent. Used as a part after evaporation and drying of the solvent,
However, the solvent cannot be completely evaporated and scattered, and it is unavoidable that the solvent is partially left and dissolved and mixed into the lubricating oil 5.

On the other hand, the lubricating oil 5 is not completely anhydrous and contains some amount of initial moisture. In the oil mechanism box 7, there is water corresponding to the amount of the lubricating oil 5 injected. It is inevitable to do. Further, moisture infiltrates due to the deterioration of the airtightness of the oil mechanism box 7 over time. As a result, the mechanical mechanism 4 is immersed in the lubricating oil 5 containing a trace amount of residual solvent and moisture.

Therefore, when the solvent is an organic halogen-based solvent, as described in the first edition "Refrigerator" of "Reprinted Refrigeration and Air Conditioning Handbook Basic Edition" edited by the Japan Refrigeration Association, iron oxide and copper oxide are used. Is used as a catalyst to hydrolyze these solvents with water to generate hydrochloric acid or hydrofluoric acid. (If the solvent contains elemental fluorine, it is formed by hydrolysis.) The hydrochloric acid and hydrofluoric acid significantly corrode the metal, and at the same time, accelerate the oxidative deterioration of the lubricating oil 5 itself, which inherently has rust-preventive power, thereby increasing the carboxylic acid. This results in further corrosion of the metal. Also, in the case of an alcohol-based solvent, it is similarly oxidatively degraded to produce a carboxylic acid, and similarly corrodes a metal. The amount of corrosive substances such as hydrochloric acid, hydrofluoric acid, and carboxylic acid that corrode metals in the lubricating oil 5 may be affected by the amount of solvent and water contained in the lubricating oil 5, the aging time, the temperature history, and the like. Conceivable.

Meanwhile, the oil-filled operating mechanism 1 as a power device is required to maintain its initial performance for a long time due to long-term reliability and maintenance-free requirements. Therefore, the above-mentioned corrosion which causes accidents and failures of the device is required. Must not be present. Therefore, an object of the present invention is to provide an oil-filled operation mechanism that does not rust mechanical mechanisms in the lubricating oil even if the inevitable solvent and moisture as described above are mixed in the lubricating oil.

[0008]

According to the present invention, there is provided an oil-filled operating mechanism in which a mechanical mechanism is housed in a hermetically sealed oil mechanism box and immersed in lubricating oil. An adsorbent in which a permeable container is filled with an adsorbent of moisture and a corrosive acid and sealed is installed in the oil mechanism box so as to be immersed in lubricating oil. In the present invention, the container is typically a non-woven bag, and the adsorbent is anhydrous sodium carbonate granule powder and magnesium silicate granule powder. More typically, anhydrous sodium carbonate granule powder and magnesium silicate granule powder are mixed, filled and sealed, and the mixing ratio is 5% by weight of magnesium silicate granule powder to anhydrous sodium carbonate granule powder. ~
95%.

In the present invention, the anhydrous sodium carbonate granule powder functions to absorb and fix the water mixed in the lubricating oil as water of crystallization, and to dissolve a small amount of the water in the lubricating oil to neutralize the acid in the water. The effect of shifting iron from the acidic side to the alkaline side of the corrosion PH range reduces the amount of water mixed in the lubricating oil, suppresses the rust and corrosion of iron, and also adds magnesium silicate Granule powder reduces the concentration of corrosive substances generated in the lubricating oil by the adsorption and fixation of active corrosive acids such as hydrochloric acid, hydrofluoric acid or carboxylic acid, and the synergistic action of these causes rusting in the lubricating oil, The chemical substance causing the corrosion is adsorbed and removed, so that the mechanical mechanism can be operated satisfactorily for a long period of time without causing rust and corrosion. For anhydrous sodium granules carbonate powder
The optimum value of the mixing ratio of the magnesium phosphate granules varies depending on the conditions in the manufacturing process, but is about 5% to 95%.
It has the effect over a wide range up to the extent.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an oil-filled operation mechanism according to the present invention will be described below with reference to the drawings. First, the configuration of the adsorbent used in the present invention will be described. FIG. 2 shows a typical configuration of the adsorbent 10. The adsorbent 10 is filled with an adsorbent 9 in which an anhydrous sodium carbonate granule powder and a magnesium silicate granule powder are mixed in an oil-permeable container 8. It is stopped. In this embodiment, a non-woven bag is used as the container 8, and the container 8 has a flat shape so as to have a large surface area. The optimum value of the mixing ratio is determined depending on the conditions in the manufacturing process and the like, but the magnesium silicate granule powder is usually 5% to 95% with respect to the anhydrous sodium carbonate granule powder in a normal weight ratio. As the adsorbent 10, the same effect can be obtained by filling and sealing the anhydrous sodium carbonate granule powder and the magnesium silicate granule powder individually without mixing them, and simultaneously using them together. .

FIG. 1 shows an embodiment of the present invention.
The main body of the oil-filled operation mechanism 1 is the same as the conventional one. In the present invention, the adsorbent 10 is provided on the oil mechanism box 7 side so as to be immersed in the lubricating oil 5. The installation position only needs to be a position at which the adsorbent 10 is not bitten during the operation of the mechanical mechanism unit 4. However, if the entire surface of the adsorbent 10 is in contact with the lubricating oil 5 and the circulation is good, It is effective. In FIG. 1, the adsorbent 10
This is an example in which the lubricating oil 5 is in contact with the adsorbent 10 by the natural convection due to the operation of the mechanical mechanism 4 or a temperature change as shown by an arrow in the figure, for example. As described above, the adsorbent 10 adsorbs and fixes the water in the lubricating oil 5, the active corrosive acid such as hydrochloric acid, hydrofluoric acid or carboxylic acid, and dissolves a small amount in the water in the lubricating oil 5 to remove the water. Rust in lubricating oil due to the effect of neutralizing acid,
The chemical substance causing the corrosion is removed by adsorption, and the mechanical mechanism 4 can be operated well without rusting or corroding for a long time. As a long-term verification of the effects of the present invention,
This was demonstrated in the following promotion experiment.

FIG. 3 shows the situation in the promotion experiment, and the experiment conditions are as follows. 1-liter internal volume
300 ml of lubricating oil and solvent 3 in the reactor 12
0 ml and 10 ml of pure water were added, and metal powder 13 in which reduced iron powder, brass powder, and aluminum powder were mixed in 6 g, 0.8 g, and 0.3 g, respectively, was added. . Lubricating oil is Daphne Hydro G of Idemitsu Kosan Co., Ltd.
T, solvent is solvent-free and trichloroethane, HCF
As C, three types of Asahiclean AK-225 of Asahi Glass Co., Ltd. and Solmix AP-7 of Alcohol Japan Sales Co., Ltd. were used as alcohol solvents. These oils and solvents are used for assembling an oil-containing operation mechanism. Rust experiment temperature 100 ^O C, with pure air by pressure ^{4.9 × 10 5 Pa (5kgf /} cm 2), starting from 0.5 hours of stirring 120 h after then stopped stirring with a stirring rod 15 The rusting condition of the test piece 14 was examined. After the experiment, the lubricating oil was collected in a 200 ml separating funnel, 100 ml of pure water was added thereto, and the mixture was shaken to wash the oil. Then, oil and water are separated by a centrifugal separator, and the water side is collected as oil washing water, and its conductivity, PH, chloride ion concentration, fluorine ion concentration and iron ion (Fe ²⁺ ) color reagent (α, α'-dipyridyl). The result is shown in FIG.

As a result, the degree of rusting of the carbon steel steel material as the test piece increased in the order of Asahicycline AK-225 <Solmix AP-7 <<<< Trichloroethane in the case of pure water without solvent, without rusting. From this fact, it can be said that the lubricating oil exhibits a rust-preventive effect when only water is mixed in the oil, but loses the rust-preventive effect when the water and the solvent are mixed at the same time. Further, as the degree of rust increased, the pH value of the oil washing water decreased, indicating acidity, and the iron ion coloration was bright red. The reason why the PH value was lowered is that, as described above, the organic halogen-based solvent was hydrolyzed by moisture to produce hydrochloric acid or hydrofluoric acid. This is illustrated in FIG.
Experiment No. shown in FIG. 1 and Experiment No. In comparison with Experiment No. 2, the conductivity, chloride ion concentration and fluorine ion concentration increased. 1 and Experiment No. 4 is also supported by the increase in conductivity and chloride ion concentration. This is because, in the case of the alcohol-based solvent, the carboxylic acid was generated by the oxidative deterioration due to the increase in the electrical conductivity. It is considered that the iron ions were detected by the coloring reagent because the above-mentioned acid corroded the carbon steel material, and as a result, the iron ions eluted in the water in the oil.

Next, as an experiment for confirming the effect of the present invention, an experiment N
o. 5 was performed. Experiment no. 4
Under the conditions shown in FIG. 5, as shown in FIG.
The adsorbent 10 which is formed in shape a bag filled and sealed in a nonwoven fabric by mixing 0g and magnesium silicate granules powder 5g was carried placed in the reactor. The results are shown in FIG. No rust was observed on the test piece, confirming the effect of the present invention. Experiment No. Compared to No. 4, the chlorine ion concentration in the oil washing water is reduced, and the PH is shifted from the acidic side to the alkaline side in the iron corrosion PH range.

The operation of the present invention is considered as follows. Anhydrous sodium carbonate granule powder functions to absorb and fix the water mixed in the lubricating oil as its own hydrate, thereby reducing the amount of water in the oil. It acts to neutralize the acid in it and shift the PH from the acidic side to the alkaline side of the iron corrosion PH range. Also silicate mug
Nesium granule powder also functions to adsorb and fix active corrosive substances such as hydrochloric acid, hydrofluoric acid, and carboxylic acid that corrode the above-mentioned steel materials. As a result, an effect of reducing the concentration of corrosive substances in the oil and preventing rusting is produced by the action of both. Water fixing performance of these anhydrous sodium carbonate and
The performance of adsorbing and fixing the corrosive substances of magnesium silicate continues until the amount of these materials reaches saturation, so that it can be expected to prevent the rusting of metals in lubricating oil for a long time.

[0016]

According to the present invention, even if inevitable moisture and solvent are mixed into the lubricating oil during the assembly of the oil-filled operating mechanism, rust and corrosion of the mechanical mechanism can be prevented for a long time. Thus, accidents and failures of equipment can be prevented, and long-term reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of an adsorbent of the present invention.

FIG. 3 is a diagram showing a promotion experiment of the present invention.

FIG. 4 is a diagram showing the results of a promotion experiment of the present invention.

FIG. 5 is a diagram showing a promotion experiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional oil-filled operation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil-filled operation mechanism 2 Control circuit part 3 Drive mechanism part 4 Mechanical mechanism part 5 Lubricating oil 6 Air box 7 Oil mechanism box 8 Container 9 Adsorbent 10 Adsorbent

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01J 20/00-20/34 H01H 33/55

Claims (4)

(57) [Claims] In an oil-filled operating mechanism in which a mechanical mechanism is housed in an oil mechanism box having an airtight structure and immersed in lubricating oil, an oil-permeable container is filled with an adsorbent for moisture and corrosive acid. An oil-filled operating mechanism, wherein the stopped adsorbent is installed in the oil mechanism box so as to be immersed in lubricating oil. 2. The oil-filled operation mechanism according to claim 1, wherein the container is a nonwoven fabric bag. 3. The oil-filled operating mechanism according to claim 1, wherein the adsorbent is an anhydrous sodium carbonate granule powder and a magnesium silicate granule powder. 4. The method of claim 3, wherein the anhydrous sodium carbonate granule powder and the magnesium silicate granule powder are mixed powders of 5% to 95% by weight of the magnesium silicate granule powder with respect to the anhydrous sodium carbonate granule powder. An oil-containing operation mechanism characterized by the following.