JP3071970U - Filter material for hot-line oil purifier and hot-line oil purifier - Google Patents

Abstract

(57) [Summary] [PROBLEMS] It is possible to simultaneously remove solid content and moisture,
Provided is a filter for a hot-line oil purifier, which has a simple structure and is easy to replace. SOLUTION: The filter medium of the present invention is for a hot-line oil purifier that absorbs and removes moisture in insulating oil from a tap switching chamber and removes solids in the insulating oil to purify the insulating oil. Filter paper used as a filter material to remove solids in oil
And a water-absorbent sheet 4 in which a water-absorbent resin for removing water in oil is sandwiched between paper or nonwoven fabric. The filter papers 2 and 3 are composed of the fine filter paper 3 and the coarse filter papers 2 and 2 laminated on both sides of the fine filter paper 3, and the water absorbing sheet 4 is interposed between the coarse filter paper 3 and the fine filter paper 2 on the upstream side. .

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a filter material for a hot-line oil purifier and a hot-line oil purifier.

[0002]

[Prior art]

 Conventional filter media for oil mainly removes solids contained in oil, and in order to remove water in oil, it was necessary to separately perform an adsorption operation using an adsorbent. For example, the purification of insulating oil by a hot-line oil purifier to purify the insulating oil in the tap switching chamber of transformers, voltage regulators, etc. is performed by using an adsorbent made of activated alumina or the like. The adsorbing section removes and adsorbs moisture, and the filtering section removes solids such as metal fine particles and carbon by filtering insulating oil using a filter element made of filter paper.

[0003]

[Problems to be solved by the invention]

 However, in the conventional hot-line oil purifier, the apparatus is complicated and large because it is separated into an adsorption section and a filtration section, and the adsorbent used in the adsorption section is expensive. As a result, the initial cost is high, and the adsorbent in the adsorption section and the filter in the filtration section must be replaced separately, which makes the replacement work and maintenance complicated, and the running cost increases accordingly. was there. The present invention has been made in view of such a problem, and is capable of simultaneously removing solids and moisture, has a simple structure, and is easy to replace. The task is to provide

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the filter material for a hot-line oil purifier according to the present invention absorbs and removes moisture in the insulating oil from the tap switching chamber, and removes solids in the insulating oil to insulate the oil. In a filter material for a hot-line oil purifier for purifying oil, a filter paper for removing solids in oil and a water-absorbent sheet in which a water-absorbent resin for removing moisture in oil is sandwiched between paper or nonwoven fabric. It is a laminate. Examples of the water-absorbent resin include cross-linked sodium polyacrylate, starch-acrylic acid graft polymer, hydrolyzate of starch-acrylonitrile graft polymer, saponified product of vinyl acetate-methyl acrylate copolymer, and isobutylene-polymer. Although a saponified maleic anhydride copolymer can be used, a crosslinked sodium polyacrylate is particularly preferred because of its large water absorption. The water-absorbent sheet is easy to handle because the water-absorbent resin is sandwiched between paper or nonwoven fabric. In the filter medium, since the filter paper and the water-absorbing sheet are combined, one filter medium removes the solid content and the water.

[0005] In the filter medium, the filter paper is composed of fine filter paper and coarse filter paper laminated on both sides of the fine filter paper, and the water absorbing sheet is interposed between the coarse filter paper and the fine filter paper on the upstream side. Is preferred. According to this, the water-absorbent resin released from the water-absorbent sheet is trapped by the fine filter paper and is prevented from flowing downstream.

Further, the hot-line oil purifier according to the present invention absorbs and removes moisture in the insulating oil from the tap switching chamber, and removes solids in the insulating oil to purify the insulating oil. In a hot-line oil purifier, a filter paper that removes solids in oil and a water-absorbent sheet that sandwiches water-absorbent resin that removes moisture in oil between paper or nonwoven fabric are superposed and laminated. After being bent into a shape, a filter medium wound in an annular shape and a middle cylinder having a plurality of holes are arranged inside a perforated outer cylinder, and the filter medium is inserted between the outer cylinder and the middle cylinder. It has a filter element in which a lid plate is attached to the upper and lower ends of the outer cylinder and the middle cylinder, and a filter tank that accommodates and fixes the filter element, and is provided between the inner surface of the filter tank and the outer surface of the filter element. Insulating oil flows into the outer cylinder And the insulating oil purified by the filter material is passed through the perforations of the middle cylinder to flow out of the filter tank.

In the hot-line oil purifier, an oil supply pipe connection nozzle and an oil delivery pipe connection seat having an oil delivery port are provided at the bottom of the filter tank, and the filter element is connected to the oil delivery pipe connection seat. Preferably, the filter element is fixed by attaching a shaft to the oil delivery pipe connection seat, inserting a holding plate for holding the filter element into the upper end of the shaft, and screwing a nut.

[0008]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a filter material 1 for a hot-line oil purifier of the present invention. The filter medium 1 is obtained by laminating two coarse filter papers 2, a fine filter paper 3, and a water-absorbing sheet 4 on top of each other. As shown by the arrow in the figure, when the oil to be filtered passes from the left to the right, the coarse filter paper 2 is disposed downstream of the fine filter paper 3, and the water absorbing sheet 4 and the coarse filter paper 3 are disposed upstream of the fine filter paper 3. ing. The water absorbing sheet 4 is interposed between the coarse filter paper 2 and the fine filter paper 3 on the upstream side.

The coarse filter paper 2 is made of cotton, pulp or the like. The fine filter paper 3 is made of glass fiber or other various fibers, and among them, glass fiber is preferable because it can remove fine solids. The water-absorbing sheet 4 is made of a cross-linked sodium polyacrylate, a starch-acrylic acid graft polymer, a hydrolyzate of a starch-acrylonitrile graft polymer, a saponified product of a vinyl acetate-methyl acrylate copolymer, and isobutylene-maleic anhydride. It has a water-absorbing resin such as a saponified copolymer, and is sandwiched between two sheets of paper or nonwoven fabric. Among the water-absorbing resins, crosslinked sodium polyacrylate is particularly preferred because of its high water absorption.

When the oil to be purified passes through the filter medium 1 having the above-described structure, a relatively large solid content contained in the oil is first removed by the coarse filter paper 2, and then, the water contained in the oil is absorbed by the water absorbing sheet. After being absorbed and removed by the filter 4, a relatively small solid content is removed by the fine filter paper 3. Therefore, since the water is removed simultaneously with the removal of the solid content by one filter medium 1, it is not necessary to separately perform a special removing operation for the water. Even if the water-absorbent resin is released from the water-absorbent sheet 4, the water-absorbent resin is collected by the fine filter paper 3 on the downstream side.

In the filter medium 1, the water absorbing sheet 4 is interposed between the fine filter paper 3 and the upstream coarse filter paper 2, but is interposed between the fine filter paper 3 and the downstream coarse filter paper 2. You may. Alternatively, as shown in FIG. 2, the filter may be placed further upstream than the upstream coarse filter paper 2, or conversely, may be placed further downstream than the downstream coarse filter paper 2. They can also be placed. Further, as described above, the filter papers 2 and 3 and the water-absorbing sheet 4 are overlapped and laminated. However, for example, the water-absorbing sheet 4 may be arranged separately from the filter papers 2 and 3 in FIG.

FIG. 3 shows a filter tank 5 for a hot-line oil purifier using the filter medium 1 shown in FIG. The filtration tank 5 includes a bottomed cylindrical filter tank 6, a filter element 7, and a lid 8. An oil supply pipe connection nozzle 9 is provided at a position eccentric from the bottom center of the filter tank 6 or at the body of the filter tank 6, and an oil delivery pipe connection seat 11 having an oil delivery port 10 is provided at the bottom center. . The oil delivery pipe connection seat 11 has a filter element support 12 protruding inside the filter tank 6 and a substantially conical protrusion 13 protruding further inward than the filter element support 12. The oil delivery port 10 branches into a T-shape within the projection 13 and opens inside the filter tank 6. A shaft 14 for fixing the filter element 7 is attached to the tip of the protrusion 13 by screwing or welding so as to coincide with the axis of the filter tank 6. The upper end of the shaft 14 extends to the vicinity of the upper end of the filter tank 6, and a circular filter element holding plate 15 is inserted into the end of the shaft 14 and a nut 16 is screwed into the shaft.

The filter element 7 includes an outer cylinder 19, a middle cylinder 20 arranged concentrically inside the outer cylinder 19, an annular lid plate 22 attached to upper and lower ends of these cylinders, It comprises the filter medium 1 inserted between the outer cylinder 19 and the middle cylinder 20. A plurality of reinforcing rings 23 are attached to the inner surface of the middle cylinder 20 in the circumferential direction. The outer cylinder 19 and the middle cylinder 20 have perforations 24 arranged at an appropriate pitch. The filter medium 1 is formed by interposing a water-absorbing sheet 4 between the filter papers 2 and 3 laminated as described above. It is wound and inserted between the outer cylinder 19 and the middle cylinder 20.

The filter element 7 configured as described above is housed inside the filter tank 6, the lower end thereof is supported on the support base 12, and the upper end is pressed by the pressing plate 15 and the nut 16. Fixed. The lid 8 removably covers the upper end opening of the filter tank 6, and a handle 25 is attached to an outer surface thereof. An air vent tube 17 is attached to the lid 8, and the upper end of the air vent tube 17 is opened to the atmosphere via a valve 18.

The operation of the filter tank 5 having the above-described configuration will be described. The insulating oil supplied from a tap switching chamber such as a transformer or a voltage regulator via an oil supply pipe connection nozzle 9 by a gear pump (not shown) is used as a filter tank. 6 flows between the inner surface of the filter element 6 and the outer surface of the filter element 7 and rises. At this time, the air inside the filter tank 6 is discharged to the outside through the air vent pipe 17 at the start of operation. Then, while rising in the filter tank 6, the insulating oil enters the inside of the outer cylinder 19 from the multi-hole 24 of the outer cylinder 19 of the filter element 7 and passes through the filter medium 1.

Here, a relatively large solid content contained in the insulating oil is first removed by the coarse filter paper 2, then, after the water is absorbed by the water absorbing sheet 4 and removed, a relatively small solid content is removed by the fine filter paper. Removed at 3. Therefore, by passing through the filter medium 1, the solid content and moisture in the insulating oil are simultaneously removed and purified.

The insulating oil thus purified by the filter medium 1 passes through the middle cylinder 20, passes through the oil outlet 10 of the projection 13, and returns to the tap switching chamber of a transformer, a voltage regulator, or the like. Reused.

[0018]

[Effect of the invention]

 As is clear from the above description, according to the present invention, a filter paper for removing solids in oil, and a water-absorbent sheet in which a water-absorbent resin for removing moisture in oil is sandwiched between paper or nonwoven fabric. Since it is a filter material for a hot-line oil purifier in which water is removed, water can be removed by a water-absorbing sheet at the same time as the removal of solids by filter paper, so that a separate adsorption operation is unnecessary as in the conventional case. For this reason, the hot-line oil purifier using this filter material has a simple structure and is downsized. Also, since only one filter medium needs to be replaced, the replacement operation becomes easy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a filter for a hot-line oil purifier of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the filter material for a hot-line oil purifier of the present invention.

FIG. 3 is a cross-sectional view illustrating a filtration tank of the hot-line oil purifier using the filtering material of the present invention.

FIG. 4 is a sectional view taken along line II of FIG. 3;

FIG. 5 is an enlarged sectional view of the filter shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter material, 2 ... Coarse filter paper, 3 ... Fine filter paper, 4 ... Water absorption sheet, 7 ... Filter element, 9 ... Oil supply pipe connection nozzle, 10 ... Oil outlet, 11 ... Oil delivery pipe connection seat, 14 ...
Shaft, 15 ... holding plate, 16 ... nut, 19 ... outer cylinder, 20 ...
Middle cylinder, 22 ... lid plate.

Claims (4)

[Utility model registration claims] 1. A filter material for a hot-line oil purifier, which absorbs and removes moisture in insulating oil from a tap switching chamber and removes solids in the insulating oil to purify the insulating oil. A filter for a hot-line oil purifier characterized by laminating a filter paper for removing the solid matter of the above and a water-absorbing sheet in which a water-absorbing resin for removing water in oil is sandwiched between paper or non-woven fabric. Wood. 2. The filter paper comprises fine filter paper and coarse filter paper laminated on both sides of the fine filter paper, wherein the water-absorbing sheet is interposed between the upstream coarse filter paper and the fine filter paper. The filter material for a hot-line oil purifier according to claim 1. 3. A live-line oil purifier that absorbs and removes moisture in insulating oil from a tap switching chamber and removes solids in the insulating oil to purify the insulating oil. Filter paper and a water-absorbent sheet obtained by sandwiching a water-absorbent resin that removes moisture in oil between paper or nonwoven fabric are laminated and laminated, folded in a bellows shape, and then wound in a loop with a filter material. Inside the outer cylinder having a perforated, a middle cylinder having a perforated is arranged, the filter medium is inserted between the outer cylinder and the middle cylinder, and lid plates are attached to upper and lower ends of the outer cylinder and the middle cylinder. A filter element, and a filter tank that accommodates and fixes the filter element. Insulating oil flows between the inner surface of the filter tank and the outer surface of the filter element to pass through the perforations of the outer cylinder, Purified by the filter media It was passed through a porous medium cylinder insulating oil, hot oil purifier, characterized in that it has to flow out from the filter tank. 4. An oil supply pipe connection nozzle and an oil delivery pipe connection seat having an oil delivery port are provided at the bottom of the filter tank, and the filter element is supported by the oil delivery pipe connection seat. The live wire according to claim 3, wherein the filter element is fixed by attaching a shaft to the pipe connection seat, inserting a holding plate for holding the filter element into the upper end of the shaft, and screwing a nut. Oil purifier.