An adsorbent filter plate for power oil, its preparation method and application

Abstract

The present invention provides an adsorption filter plate for electric power oil, a preparation method thereof and an application. The adsorption filter plate for electric power oil comprises a hollow filter plate frame, filter meshes disposed at the upper and lower frame openings of the filter plate frame, and an adsorbent disposed in the hollow area of the filter plate frame. The adsorbent is prepared by mixing sulfuric acid solution, aluminum sulfate solution, sodium silicate solution and ammonia water, stirring and aging, washing with water and then drying in the air to form a viscous adsorbent semi-finished product, and then injecting the viscous adsorbent semi-finished product into the filter plate frame, and drying the filter plate frame together with the adsorbent to form the adsorption filter plate; and the above adsorption filter plate is used to replace the existing adsorption filter plate in a plate type oil filter, and the inferior insulating oil is filtered for 24 to 48 hours under the condition that the oil filtering pressure is 3 to 8 atmospheres for regeneration treatment. The adsorption filter plate has the advantages of deeply adsorbing polar molecules and heterogeneous chemical bonds in the deteriorated insulating oil, as well as colored oxidation molecules such as alcohols, aldehydes and esters in the oil. After treatment, the performance indexes such as color, acid value and dielectric loss of the insulating oil can be restored to the level of new insulating oil.

Description

Technical Field

[0001] The present invention belongs to the field of energy conservation and environmental protection, and particularly relates to an oil adsorption filter plate for electric power, a preparation method and an application thereof. Background Art

[0002] Degraded used insulating oil becomes a "hazardous waste" as defined by national environmental regulations. This type of "hazardous waste" not only results in significant resource waste and economic losses, but also poses serious risks to human life and the ecological environment. However, current methods for remediating degraded transformer oil, both domestically and internationally, suffer from secondary contamination, slow repair speeds, cumbersome processes, and low efficiency. Furthermore, methods for remediating degraded insulating oil performance suffer from limited effectiveness, poor impurity removal and decolorization, and environmental pollution.

[0003] A plate-and-frame oil filter is a commonly used oil filtration device, widely used for filtering edible and industrial oils such as lubricating oil, hydraulic oil, and machine tool cooling oil. Its operating principle is that unfiltered crude oil is transported through the oil inlet channel into the chamber of the oil filter plate. Suspended solid particles in the crude oil are isolated by the filter cloth. After filtration, the clean oil passes through the filter cloth into the oil filter chamber and is recovered through the oil outlet channel. Existing plate-and-frame oil filters primarily rely on filter cloth or paper, providing only simple filtration and not suitable for secondary repair of waste insulating oil.

[0004] Adsorption is a commonly used regeneration method for waste insulating oil. This method uses adsorbents such as diatomaceous earth, silica gel, activated alumina, molecular sieves, silica-alumina, or other modified adsorbents as filter media, and purifies the oil through repeated cycles in an adsorption tank. Using an adsorption tank is associated with bulky equipment and complex supporting equipment. Furthermore, after a period of use, the adsorbent typically becomes stained with oil, contains impurities, and degrades, affecting adsorption effectiveness and slowing down repair. Over time, the adsorbent can also become ineffective, requiring regeneration before continued use. Regenerating adsorbents in adsorption tanks is complex and cumbersome. Summary of the Invention

[0005] In response to the hazards of degraded insulating oil and the shortcomings of existing methods for repairing the performance of degraded insulating oil at home and abroad, the present invention provides an electric power oil adsorption filter plate, a preparation method, and an application. The filter plate is small in size and can be suitable for adsorbents in various states. It can replace the filter plate in a plate-type oil filter to treat degraded insulating oil, greatly improving the adsorption efficiency.

[0006] In order to achieve the above technical objectives, the present invention provides an adsorption filter plate for power oil, which is characterized in that: the adsorption filter plate includes a hollow filter plate frame, an upper filter net placed on the upper frame opening of the filter plate frame, a lower filter net placed on the lower frame opening of the filter plate frame, and an adsorbent placed in the hollow area of the filter plate frame. The adsorbent fills the hollow area of the filter plate frame and is fixed by the upper filter net and the lower filter net. Filter plate mounting holes are correspondingly provided on the filter plate frame, the upper filter net and the lower filter net.

[0007] A preferred technical solution of the present invention: The upper filter net and the lower filter net are fixedly connected to the filter plate frame by bolts or other metal connectors.

[0008] A preferred technical solution of the present invention: The adsorbent is a solid adsorbent formed by injecting a semi-finished viscous adsorbent into the filter plate frame and then solidifying and drying it; the semi-finished viscous adsorbent is made by mixing the following substances in parts by weight, aging for 8 - 9 hours at 80°C - 90°C, washing with water and then drying in the air:

[0009]

[0010]

[0011] In order to achieve the above technical objectives, the present invention also provides a preparation method for an adsorption filter plate for power oil, which is characterized in that the specific steps are as follows:

[0012] (1) Mix 25 parts of a sulfuric acid solution with a mass percentage concentration of 18% - 22%, 23 parts of an aluminum sulfate solution with a mass percentage concentration of 6% - 8%, 23 parts of a sodium silicate solution with a mass percentage concentration of 4% - 7%, and 1.35 parts of ammonia water with a mass percentage concentration of 21% - 30%, stir well, and then pump it into a reaction kettle for aging. The aging temperature is controlled at 80°C - 90°C, and the aging time is 8 - 9 hours;

[0013] (2) Wash and then dry in the air the mixture after the aging treatment in step (1) to prepare a semi-finished viscous adsorbent;

[0014] (3) Prepare the filter plate frame of the adsorption plate. The filter plate frame is a hollow frame body, and filter nets are provided on both its upper frame opening and lower frame opening. Inject the semi-finished viscous adsorbent prepared in step (2) into the hollow frame body of the filter plate frame, then put it into an oven and dry it at 105 - 135°C until its volume is reduced by half. Inject the semi-finished viscous adsorbent prepared in step (2) again, and repeat the above process until the adsorbent is completely dry, and fill the filter plate frame to form the adsorption filter plate for power oil.

[0015] A preferred technical solution of the present invention: The drying time in step (3) is 24 - 28h each time.

[0016] To achieve the above technical objectives, the present invention also provides an application of an adsorption filter plate for electric power oil, characterized in that the above-mentioned adsorption filter plate for electric power oil is used in a flat oil filter to replace the adsorption filter plate in the existing flat oil filter, and the poor-quality insulating oil is filtered for 24 to 48 hours under the condition of an oil filtering pressure of 3 to 8 atmospheres for regeneration treatment.

[0017] A further technical solution of the present invention: The flat oil filter includes an oil receiving tray, an oil pump, a plate-frame oil absorption device placed in the oil receiving tray, and a support frame placed at the bottom of the oil receiving tray. The plate-frame oil absorption device includes a front baffle, a rear baffle, and multiple adsorption filter plates placed between the front and rear baffles. Filtering sheets are respectively provided on the two adsorption surfaces of each adsorption filter plate. The adsorption filter plate includes a hollow filter plate frame, an upper filter net placed at the upper frame opening of the filter plate frame, a lower filter net placed at the lower frame opening of the filter plate frame, and an adsorbent placed in the hollow area of the filter plate frame; an oil inlet leading to the hollow area of the adsorption filter plate is provided on the front baffle, and an oil outlet communicating with the hollow area of the adsorption filter plate is provided on the rear baffle. The oil inlet is connected to the oil pump through an oil pipe and is communicated with an oil inlet pipe outside the oil receiving tray through the oil pump. The oil outlet leads to the outside of the oil receiving tray through an oil outlet pipe.

[0018] A preferred technical solution of the present invention: The adsorption filter plate and the filtering sheet are correspondingly provided with filter plate mounting holes. A filter plate fixing rod is provided between the front baffle and the rear baffle. The filter plate fixing rod is fixed on the front baffle. Multiple adsorption filter plates and filtering sheets are sleeved on the filter plate fixing rod through the filter plate mounting holes and are pressed by the rear baffle. A locking rod is provided on the oil outlet side of the rear baffle. The locking rod is installed on the oil receiving tray through a locking frame. Its locking end touches the rear baffle, and after multiple adsorption filter plates and filtering sheets are installed, it is rotated and tightened to push the rear baffle to fix and lock the adsorption filter plates and filtering sheets.

[0019] A preferred technical solution of the present invention: The oil pump is placed at the bottom of the oil receiving tray. An oil inlet valve is provided on the oil inlet pipe. A return oil pipe communicating with the oil receiving tray is provided at the bottom of the oil receiving tray. The part of the return oil pipe of the oil inlet pipe is communicated with the oil inlet end of the oil inlet valve.

[0020] A preferred technical solution of the present invention: The filtering sheet is a filter paper sheet or a filter cloth sheet.

[0021] The adsorption filter plate of the present invention can be used in a flat oil filter and directly used as the filter plate of the flat oil filter. The adsorbent in the filter plate of the present invention has the advantages of deeply adsorbing polar molecules and heterogeneous chemical bonds in the deteriorated insulating oil, as well as colored oxidation molecules such as alcohols, aldehydes, and esters in the oil. The oil passes through the adsorbent under pressure from the filter plate to filter out polar substances.

[0022] The adsorption filter plate for power oil in the present invention has a simple structure and small volume. Granular adsorbents and gel-like semi-finished adsorbents with various particle sizes can be placed inside the filter plate, which enlarges the application range of the adsorbents. Moreover, this filter plate can be used to replace the filter plate in a plate-type oil filter to form an efficient adsorption treatment machine for repairing deteriorated insulating oil. After being processed by this treatment machine, the performance indicators such as color, acid value, and dielectric loss of the deteriorated insulating oil can be restored to the level of new insulating oil. Compared with the regeneration adsorption tank for power oil, the present invention is more convenient to process, and the adsorption efficiency is increased by 2 to 3 times under the same amount of adsorbent used. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the adsorption filter plate for power oil in the present invention;

[0024] Figure 2 is a disassembled schematic diagram of the adsorption filter plate for power oil in the present invention;

[0025] Figure 3 is a schematic structural diagram of the high-efficiency adsorption treatment machine for power oil in the present invention;

[0026] Figure 4 is a top view of the high-efficiency adsorption treatment machine for power oil in the present invention.

[0027] In the figures: 1 - adsorption filter plate, 100 - filter plate frame, 101 - upper filter screen, 102 - lower filter screen, 103 - adsorbent, 104 - filter plate mounting hole, 105 - bolt, 2 - oil receiving tray, 3 - support frame, 4 - front baffle, 400 - oil inlet, 5 - rear baffle, 500 - oil outlet, 6 - filter sheet, 7 - oil pump, 8 - oil pipe, 9 - inlet oil pipe, 10 - outlet oil pipe, 11 - return oil pipe, 12 - locking rod, 13 - locking frame, 14 - inlet oil valve. Detailed Embodiments

[0028] The present invention will be further described below with reference to the drawings and embodiments. The attached Figures 1 to 4 are all the drawings of the embodiments of the present invention, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the purpose of the embodiments of the present invention. The technical solutions shown in the drawings below are the specific solutions of the embodiments of the present invention and are not intended to limit the scope of the present invention claimed. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0030] The adsorption filter plate for power oil provided in the first embodiment is as Figure 1 and Figure 2 shown. The adsorption filter plate 1 includes a hollow filter plate frame 100, an upper filter net 101 placed at the upper frame opening of the filter plate frame 100, a lower filter net 102 placed at the lower frame opening of the filter plate frame 100, and an adsorbent 103 placed in the hollow area of the filter plate frame 100. The adsorbent 103 fills the hollow area of the filter plate frame 100 and is fixed by the upper filter net 101 and the lower filter net 102. The upper filter net 101 and the lower filter net 102 are fixedly connected to the filter plate frame 100 by bolts 105 or other metal connectors. Filter plate mounting holes 104 are correspondingly provided on the filter plate frame 100, the upper filter net 101, and the lower filter net 102. The adsorbent 103 is a solid adsorbent formed by injecting a viscous XDK1-3 adsorbent semi-finished product into the filter plate frame 100 and then solidifying and drying it. The viscous adsorbent semi-finished product is made by mixing the following substances in parts by weight, aging for 8 to 9 hours under the condition of 80 °C to 90 °C, washing with water, and then drying in the air:

[0031]

[0032] The second embodiment provides a flat oil filter with the above-mentioned adsorption filter plate for power oil, as Figure 2 and Figure 3As shown in the figure, the processor includes an oil receiving tray 2, an oil pump 7, a plate-frame oil suction device placed in the oil receiving tray 2, and a support frame 3 placed at the bottom of the oil receiving tray 2. The oil receiving tray 2 is supported by the support frame 3, and the oil pump 7 is arranged on the support frame body at the bottom of the oil receiving tray 2. The plate-frame oil suction device includes a front baffle 4, a rear baffle 5, and multiple power oil adsorption filter plates of Example 1 placed between the front and rear baffles. Filter sheets 6 are respectively arranged on the two adsorption surfaces of each adsorption filter plate 1. The filter sheets 6 are made of filter paper, and the adsorption filter plates 1 are the power oil adsorption filter plates in Example 1; the adsorption filter plates 1 and the filter sheets 6 are correspondingly provided with filter plate mounting holes 104. A filter plate fixing rod is arranged between the front baffle 4 and the rear baffle 5. The filter plate fixing rod is fixed on the front baffle 4. Multiple adsorption filter plates 1 and filter sheets 6 are sleeved on the filter plate fixing rod through the filter plate mounting holes 104 and are pressed by the rear baffle 5. A locking rod 12 is arranged on the oil outlet side of the rear baffle 5. The locking rod 12 is installed on the oil receiving tray 2 through a locking frame 13. Its locking end contacts the rear baffle 5, and after multiple adsorption filter plates 1 and filter sheets 6 are installed, it is rotated and tightened to push the rear baffle 5 to fix and lock the adsorption filter plates 1 and the filter sheets 6.

[0033] The flat oil filter in Example 2, as Figure 2 and Figure 3 shown in the figure, an oil inlet 400 leading to the hollow area of the adsorption filter plate 1 is arranged on the front baffle 4, and an oil outlet 500 communicated with the hollow area of the adsorption filter plate 1 is arranged on the rear baffle 5. The oil inlet 400 is connected to the oil pump 7 through an oil pipe 8 and is communicated with an oil inlet pipe 9 outside the oil receiving tray 2 through the oil pump 7. An oil inlet valve 14 is arranged on the oil inlet pipe 9. The oil outlet 500 leads to the outside of the oil receiving tray 2 through an oil outlet pipe 10. A return oil pipe 11 communicated with the oil receiving tray 2 is arranged at the bottom of the oil receiving tray 2. The return oil pipe 11 is communicated with the part of the oil inlet pipe 9 at the oil inlet end of the oil inlet valve 10.

[0034] Example 3 provides a specific preparation process for the power oil adsorption filter plate described in Example 1. The specific steps are as follows:

[0035] (1) Mix 25 parts of a sulfuric acid solution with a mass percentage concentration of 19.6%, 23 parts of an aluminum sulfate solution with a mass percentage concentration of 6.91%, 23 parts of a sodium silicate solution with a mass percentage concentration of 6.05%, and 1.35 parts of ammonia water with a mass percentage concentration of 25%, stir them, and then pump them into a reaction kettle for aging. The aging temperature is controlled at 80°C - 90°C, and the aging time is 8 - 9 hours;

[0036] (2) Wash the mixture after the aging treatment in step (1) with water and then dry it to prepare a viscous adsorbent semi-finished product;

[0037] (3) preparing a filter plate frame for the adsorption plate, wherein the filter plate frame is a hollow frame, and the upper and lower frame openings thereof are both provided with filter screens, injecting the viscous adsorbent semi-finished product prepared in step (2) into the hollow frame of the filter plate frame, and then placing it in an oven and drying it at 105-135° C. for 24 hours until the volume is reduced to half, and injecting the viscous adsorbent semi-finished product prepared in step (2) again, repeating the above process until the adsorbent is completely dry, and filling the filter plate frame to form the power oil adsorption filter plate.

[0038] The power oil adsorption filter plate prepared in Example 3 was installed in the flat-plate oil filter unit in Example 2 to perform adsorption treatment on low-quality insulating oil. Specifically, the low-quality insulating oil was pumped into a plate-and-frame oil suction unit via an oil pump 7 through an oil inlet pipe 9. The oil was then filtered and adsorbed by multiple adsorption filter plates 1 and filter discs 6, and then discharged from an oil outlet 500 and an oil outlet pipe 10. Oil leaking from the plate-and-frame oil suction unit was collected by an oil pan 2 and then returned to the oil inlet pipe 9 via an oil return pipe 11 for renewed filtration and adsorption treatment. During the treatment of the insulating oil, the flat-plate oil filter unit's filtration pressure was set at 3 to 8 atmospheres, and the filtration period was 24 to 48 hours. After testing for color, acidity, dielectric loss, and other performance indicators, the treated insulating oil was restored to the level of new insulating oil.

[0039] The inventors of the present application conducted an experimental comparison between the adsorption effect of the electric oil adsorption filter plate prepared in Example 3 and the effect of direct adsorption using an adsorbent. In the experiment, the amount of adsorbent, adsorption time and adsorption temperature were three important technical indicators; in order to ensure the experimental effect, the temperature of the inferior insulating oil was raised to above 55°C through a heater, and the adsorption treatment was carried out after reducing the viscosity.

[0040] Test A: 30 kg of waste oil from the Xicheng Substation's No. 1 main transformer was adsorbed using the power oil adsorption filter plates of the present invention. Twenty of the power oil adsorption filter plates prepared in Example 3 were installed in the flat-plate oil filter unit described in Example 2. The total adsorbent weight of the 20 plates was 127.5 g, representing an adsorbent dosage of 0.425% of the total weight of the waste insulating oil. The waste insulating oil, heated to 55°C, was then circulated in the flat-plate oil filter unit for 6 hours, and the dielectric loss test results were recorded.

[0041] Test B: Similarly, 30 kg of the spare waste oil from the No. 1 main transformer of the Xicheng substation was directly adsorbed using an adsorbent. The adsorbent used was the same adsorbent as that in the power oil adsorption filter plate in Example 3. The adsorbent was added to the adsorption tank for adsorption. The amount of adsorbent was 4.25% of the total weight of the waste insulating oil. The adsorbent was added twice, with each adsorption cycle lasting 6 hours. The dielectric loss test results were recorded. The comparative test results are shown in Table 1.

[0042] Table 1 Treatment effects of adsorbent and adsorption plate

[0043]

[0044] From the comparison results in Table 1, it can be seen that the normal usage standard of insulating oil is that the micro water is less than 35 ppm, the acid value is less than 0.03, the dielectric loss is less than 2%, and the pH value is greater than 5; while the standards of the discarded insulating oil cannot meet the requirements. After being adsorbed and treated by the adsorbent and the adsorption plate, the dielectric loss, acid value, pH value, and light transmittance indicators of the transformer oil reach the oil quality standards before the main transformer is put into operation. However, in Test A, the dosage of the adsorbent in the adsorption plate is only 10% of the dosage when directly using the adsorbent in Test B, but the achieved adsorption effect is basically the same as that in Test B. It can be proved that the adsorption plate in the present invention can still achieve the adsorption effect when the dosage of the adsorbent is reduced by 90%.

[0045] After the power oil adsorption filter plate in the present invention fails, only need to remove the adsorption filter plate, then extract its adsorbate with acetone or petroleum ether, dry it in the air and put it into the oven, dry it at 105 - 135 °C for 24 hours, and then it can be used continuously. Its regeneration treatment is simple.

[0046] The present invention makes use of the advantages that the adsorbent deeply adsorbs polar molecules and different chemical bonds in deteriorated insulating oil, as well as colored oxidation molecules such as alcohols, aldehydes, and esters in the oil. The oil passes through the adsorbent through pressure from the filter plate to filter out polar substances.

[0047] As described above, this is only one embodiment of the present invention, and its description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electric power oil adsorption filter plate, characterized by: The adsorption filter plate (1) comprises a hollow filter plate frame (100), an upper filter screen (101) placed at the upper frame opening of the filter plate frame (100), a lower filter screen (102) placed at the lower frame opening of the filter plate frame (100), and an adsorbent (103) placed in the hollow area of the filter plate frame (100), wherein the adsorbent (103) fills the hollow area of the filter plate frame (100) and is fixed by the upper filter screen (101) and the lower filter screen (102), and filter plate mounting holes (104) are correspondingly opened on the filter plate frame (100), the upper filter screen (101), and the lower filter screen (102); The adsorbent (103) is a solid adsorbent formed by injecting a viscous adsorbent semi-finished product into a filter plate frame (100), and then placing the semi-finished product into an oven together with the filter plate frame (100) and drying the oven at 105-135°C. The preparation process of the power oil adsorption filter plate is as follows: (1) 25 parts by mass of a sulfuric acid solution with a concentration of 18% to 22%, 23 parts by mass of an aluminum sulfate solution with a concentration of 6% to 8%, 23 parts by mass of a sodium silicate solution with a concentration of 4% to 7%, and 1.35 parts by mass of an ammonia solution with a concentration of 21% to 30% are mixed and stirred, and then pumped into a reactor for aging, with the aging temperature controlled at 80°C to 90°C and the aging time being 8 to 9 hours; (2) washing the mixture after aging treatment in step (1) with water and then drying it to prepare a viscous adsorbent semi-finished product; (3) Prepare a filter plate frame for the adsorption plate, wherein the filter plate frame is a hollow frame, and the upper and lower frame openings thereof are both provided with filter screens. The viscous adsorbent semi-finished product prepared in step (2) is injected into the hollow frame of the filter plate frame, and then placed in an oven and dried at 105-135°C until the volume is reduced to half. The viscous adsorbent semi-finished product prepared in step (2) is injected again, and the above process is repeated until the adsorbent is completely dried, and the filter plate frame is filled to form the power oil adsorption filter plate.

2. The electric power oil adsorption filter plate according to claim 1, characterized in that: The upper filter screen (101) and the lower filter screen (102) are fixedly connected to the filter plate frame (100) via bolts (105) or metal connectors.

3. The method for preparing a power oil adsorption filter plate according to claim 1, characterized in that: The drying time in step (3) is 24 to 28 hours each time.

4. An application of the electric power oil adsorption filter plate according to claim 1 or 2, characterized in that: The above-mentioned power oil adsorption filter plate is used in a flat plate oil filter to replace the adsorption filter plate in the existing flat plate oil filter, and the low-quality insulating oil is filtered for 24 to 48 hours under the condition of oil filtering pressure of 3 to 8 atmospheres for regeneration treatment; The flat oil filter comprises an oil receiving pan (2), an oil pump (7), a plate-and-frame oil suction device placed in the oil receiving pan (2), and a support frame (3) placed at the bottom of the oil receiving pan (2). The plate-and-frame oil suction device comprises a front baffle (4), a rear baffle (5), and a plurality of adsorption filter plates (1) placed between the front and rear baffles. Filter sheets (6) are provided on the two adsorption surfaces of each adsorption filter plate (1). The adsorption filter plate (1) comprises a hollow filter plate frame (100), an upper filter screen (101) placed at the upper frame opening of the filter plate frame (100), and a filter screen (102) placed at the lower frame opening of the filter plate frame (100). The lower filter screen (102) of the frame opening and the adsorbent (103) are placed in the hollow area of the filter plate frame (100); an oil inlet (400) leading to the hollow area of the adsorption filter plate (1) is provided on the front baffle (4); an oil outlet (500) communicating with the hollow area of the adsorption filter plate (1) is provided on the rear baffle (5); the oil inlet (400) is connected to the oil pump (7) through the oil pipe (8), and is communicated with the oil inlet pipe (9) outside the oil receiving pan (2) through the oil pump (7); the oil outlet (500) leads to the outside of the oil receiving pan (2) through the oil outlet pipe (10).

5. The application of an oil adsorption filter plate for electric power according to claim 4, characterized in that: The adsorption filter plate (1) and the filter disc (6) are provided with filter plate mounting holes (104) correspondingly, a filter plate fixing rod is provided between the front baffle (4) and the rear baffle (5), the filter plate fixing rod is fixed on the front baffle (4), a plurality of adsorption filter plates (1) and filter discs (6) are sleeved on the filter plate fixing rod through the filter plate mounting holes (104), and are pressed by the rear baffle (5), a locking rod (12) is provided on the oil outlet side of the rear baffle (5), the locking rod (12) is installed on the oil receiving pan (2) through the locking frame (13), the locking end of the locking rod is in contact with the rear baffle (5), and after the plurality of adsorption filter plates (1) and the filter disc (6) are installed, the rear baffle (5) is rotated and tightened to push the rear baffle (5) to fix and lock the adsorption filter plate (1) and the filter disc (6).

6. The application of an oil adsorption filter plate for electric power according to claim 4, characterized in that: The oil pump (7) is placed at the bottom of the oil receiving pan (2), an oil inlet valve (14) is provided on the oil inlet pipe (9), an oil return pipe (11) connected to the oil receiving pan (2) is provided at the bottom of the oil receiving pan (2), and the oil return pipe (11) is connected to the portion of the oil inlet pipe (9) located at the oil inlet end of the oil inlet valve (14).

7. The application of an oil adsorption filter plate for electric power according to claim 4, characterized in that: The filter sheet (6) is a filter paper sheet or a filter cloth sheet.

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