Anti-blocking two-stage vacuum oil filter

Abstract

The invention relates to the technical field of oil filtering, in particular to an anti-blocking two-stage vacuum oil filter which comprises a filtering tank, a two-stage vacuum oil filter, an electric control valve and the like. A two-stage vacuum oil filter is arranged on the side of the filtering tank and is used for removing moisture and gas in the oil liquid; and an electric control valve is arranged between the filtering tank and the two-stage vacuum oil filter. Large-particle impurities are filtered out through the first filtering frame, then small-particle impurities are filtered out through the second filtering frame, and through gradual filtering from large particles to small particles, the load of a single-layer filtering piece is reduced, the situation that a certain layer of filtering piece is blocked too early, oil liquid downward flowing is affected is avoided, and the frequency of replacing the filtering piece is reduced; and air below the filter frame II is continuously sucked by the air pump, so that negative pressure is formed below the filter frame II, and oil on impurities in the filter frame I and the filter frame II flows downwards to the lower part of the filter tank under the action of atmospheric pressure.

Description

Technical Field

[0001] The present application relates to the technical field of oil filtering, and in particular to an anti-clogging double-stage vacuum oil filter. Background Art

[0002] The two-stage vacuum oil filter is a highly efficient oil purification equipment, which is widely used in the power, machinery, petrochemical and other industries to remove moisture, gas and particulate impurities in the oil. For particulate impurities, they are usually removed by filter screens or filter membranes.

[0003] Chinese patent: CN220214520U proposes a two-stage vacuum oil filter, which uses a coarse filter membrane to coarsely filter large particles of impurities in the external oil, and replaces the used coarse filter membrane, thereby reducing the probability of clogging of the oil inlet pipe; however, the coarse filter membrane is very easy to be clogged, and the coarse filter membrane needs to be replaced frequently, which is time-consuming, labor-intensive, and inefficient; moreover, some oil usually remains on the impurities on the coarse filter membrane, resulting in the problem of oil waste. Summary of the invention

[0004] In order to overcome the disadvantages of the existing two-stage vacuum oil filter that the coarse filter membrane is very easy to be blocked and needs to be frequently replaced, the present invention provides a two-stage vacuum oil filter that is anti-blocking.

[0005] The technical implementation scheme of the present invention is: a blockage-proof double-stage vacuum oil filter, including a filter tank, a double-stage vacuum oil filter and an electric control valve; a double-stage vacuum oil filter is arranged on the side of the filter tank, and the double-stage vacuum oil filter is used to remove moisture and gas in the oil; an electric control valve is arranged between the filter tank and the double-stage vacuum oil filter; it also includes a cylinder, a mounting plate, a connecting rod, a filter frame one, a filter frame two and an air pipe; a plurality of cylinders are fixedly connected to the filter tank; all the telescopic ends of the cylinders are commonly fixedly connected to the mounting plate; a connecting rod is connected to the mounting plate; the lower part of the connecting rod is detachably connected to the filter frame one and the filter frame two, the filter frame one is located above the filter frame two, and the filter hole diameter of the filter frame one is larger than the filter hole diameter of the filter frame two; the filter frame one and the filter frame two are both in contact with the inner wall of the filter tank; the lower part of the filter tank is connected to the air pipe, and the air pipe is located below the filter frame two.

[0006] Preferably, a filter membrane is provided at one end of the air pipe facing the filter tank.

[0007] Preferably, the invention further comprises a motor; the motor is fixedly connected to the mounting plate; and the output shaft of the motor is fixedly connected to the connecting rod.

[0008] Preferably, the lower side of the filter frame is concave upward, and the shape of the concave is conical; a plurality of guide grooves 1 are equidistantly opened in a circular shape on the inner wall of the filter tank; a plurality of guide grooves 2 are equidistantly opened in a circular shape on the lower side of the filter frame; each guide groove 1 is connected to a guide groove 2 respectively; the lower end of the guide groove is located below the filter frame 2.

[0009] Preferably, it also includes a clamping block, a straight spring and a scraper; the filter frame 2 is composed of a retaining ring and a filter plate; the retaining ring is slidably connected to the outer edge of the filter plate; the filter plate is detachably connected to the filter tank; a number of clamping blocks are slidably connected in an annular shape equidistantly inside the retaining ring; a number of straight springs are fixedly connected between each clamping block and the retaining ring; an oblique angle is opened on the upper side of the filter tank; a number of scrapers are fixedly connected in an annular shape equidistantly inside the retaining ring; all the scrapers are in contact with the connecting rod; all the scrapers are in contact with the filter plate.

[0010] Preferably, the upper side of the block is arranged to be inclined.

[0011] Preferably, a stopper is also included; a stopper is arranged in each guide groove 1; and there is a gap between the stopper and a side of the guide groove 1 away from the center point of the filter tank.

[0012] As a preference, it further comprises fixed rods and scraping strips; a plurality of fixed rods are fixedly connected to the lower side of the retaining ring; the scraping strips are fixedly connected to the lower ends of all the fixed rods; and the scraping strips are in contact with the filter disc.

[0013] Preferably, a plurality of vertical grooves are formed on the scraper strip.

[0014] Preferably, it also includes a stripper bar; a stripper bar is fixedly connected to the lower side of the filter disc; and the scraper bar is made of elastic rubber material.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention first filters out large particles of impurities by filter frame 1, and then filters out small particles of impurities by filter frame 2. By gradually filtering from large particles to small particles, the load of a single-layer filter element is reduced. The two-layer filtration can disperse the filtration load, avoid premature clogging of a certain layer of filter elements, affect the downstream flow of oil, and reduce the frequency of replacing the filter elements; and continuously suck out the air under the filter frame 2 by an air pump, so that a negative pressure is formed under the filter frame 2. In this way, under the action of atmospheric pressure, the oil on the impurities in the filter frames 1 and 2 will flow downward to the lower part of the filter tank, avoiding waste of oil.

[0016] 2. The present invention controls the motor to drive the mounting plate, the connecting rod, the filter frame 1 and the filter disc to rotate. The filter disc moves relative to the retaining ring and the scraper. The scraper will temporarily scrape up the impurities on the filter disc, so that the oil can smoothly pass through the filter disc and fall to the lower part of the filter tank. In this way, when the filter frame 1 is not completely blocked, the filter frame 2 can still perform the filtering operation. When the filter frame 1 is completely blocked, the filter frame 1 and the filter frame 2 are taken out together for cleaning, thereby reducing the frequency of cleaning.

[0017] 3. The present invention drives the mounting plate, the connecting rod, the filter frame 1 and the filter disc to rotate by controlling the motor. The filter disc moves relative to the retaining ring and the scraper. The scraper bar is fixedly connected to the retaining ring through the fixing rod. Therefore, the lower side of the filter disc will also rotate relative to the scraper bar. The scraper bar can scrape the residual oil on the lower side of the filter disc and then drop it to the lower part of the filter tank along the scraper bar, so as to avoid residual oil on the lower side of the filter frame 2 and cause waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the connecting rod, filter frame 1 and filter frame 2 of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the scraper and the puller of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the guide groove 1, the guide groove 2 and the block of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping block, the straight spring and the scraper of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing rod and the scraping strip of the anti-clogging double-stage vacuum oil filter of the present invention; Figure 7 The exploded view is a three-dimensional structure of a baffle ring, a filter plate, a fixing rod and a scraper strip of the anti-clogging double-stage vacuum oil filter of the present invention.

[0019] Explanation of the reference numerals: 1-filter tank, 101-guide groove one, 2-two-stage vacuum oil filter, 3-electrically controlled valve, 4-cylinder, 5-mounting plate, 6-connecting rod, 7-filter frame one, 701-guide groove two, 8-filter frame two, 801-blocking ring, 802-filter plate, 9-air pipe, 10-motor, 21-block, 22-straight spring, 23-scraper, 24-block, 31-fixing rod, 32-scraper strip, 33-pull strip. DETAILED DESCRIPTION

[0020] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0021] Example 1 A two-stage vacuum oil filter that prevents clogging, such as Figure 1-Figure 7 As shown, it includes a filter tank 1, a two-stage vacuum oil filter 2 and an electric control valve 3; the two-stage vacuum oil filter 2 is arranged on the left side of the filter tank 1; the electric control valve 3 is arranged between the filter tank 1 and the two-stage vacuum oil filter 2; It also includes a cylinder 4, a mounting plate 5, a connecting rod 6, a filter frame 1 7, a filter frame 2 8 and an air pipe 9; two cylinders 4 are fixedly connected to the filter tank 1; the telescopic ends of all cylinders 4 are commonly fixedly connected to the mounting plate 5; the mounting plate 5 is connected to the connecting rod 6; the lower part of the connecting rod 6 is detachably connected to the filter frame 1 7 and the filter frame 2 8, the filter frame 1 7 is located above the filter frame 2 8, and the filter hole diameter of the filter frame 1 7 is larger than the filter hole diameter of the filter frame 2 8; the filter frame 1 7 and the filter frame 2 8 are both in contact with the inner wall of the filter tank 1; the lower part of the filter tank 1 is connected to the air pipe 9, and the air pipe 9 is located below the filter frame 2 8.

[0022] In order to prevent the air pipe 9 from sucking away the oil, a filter membrane is provided at one end of the air pipe 9 facing the filter tank 1 .

[0023] It also includes a motor 10; the motor 10 is bolted to the mounting plate 5; and the output shaft of the motor 10 is fixedly connected to the connecting rod 6.

[0024] The lower side of the filter frame 7 is concave upward, and the shape of the concave is conical; a plurality of guide grooves 101 are equidistantly opened in a circular shape on the inner wall of the filter tank 1; a plurality of guide grooves 2 701 are equidistantly opened in a circular shape on the lower side of the filter frame 7; each guide groove 101 is connected to a guide groove 2 701 respectively; the lower end of the guide groove 101 is located below the filter frame 2 8.

[0025] Step 1: Pour the oil into the filter tank 1, and filter the granular impurities in the oil by the filter frame 1 7 and the filter frame 2 8. The filter hole diameter of the filter frame 1 7 is larger than the filter hole diameter of the filter frame 2 8. The large particle impurities are first filtered out by the filter frame 1 7, and then the small particle impurities are filtered out by the filter frame 2 8. By gradually filtering from large particles to small particles, the load of the single-layer filter element is reduced. The two-layer filtration can disperse the filtration load, avoid premature clogging of a certain layer of filter elements, affect the downstream of the oil, and reduce the frequency of replacing the filter elements; during the filtration process In the process, the control motor 10 drives the connecting rod 6, the filter frame 1 7 and the filter frame 2 8 to rotate, so that the impurities in the oil can be evenly distributed on the surface of the filter screen to avoid premature clogging in local areas, thereby improving the overall filtration efficiency; it should be noted that the rotation speed of the filter frame 1 7 and the filter frame 2 8 should be controlled to prevent the filter frame 1 7 and the filter frame 2 8 from rotating too fast, so that the impurities in the filter frame 1 7 and the filter frame 2 8 generate a large centrifugal force and move to the outer edge of the filter frame 1 7 and the filter frame 2 8, resulting in clogging of the outer edge of the filter frame 1 7 and the filter frame 2 8.

[0026] Step 2: The filtered oil flows into the lower part of the filter tank 1, then the electric control valve 3 is opened, and the double-stage vacuum oil filter 2 is started. The double-stage vacuum oil filter 2 sucks the oil in the lower part of the filter tank 1 into the filter tank 1, performs vacuum filtration, removes impurities such as moisture and gas in the oil, and the oil discharged at last is the filtered oil.

[0027] Step 3: When a lot of impurities are accumulated in the filter frame 1 7 and the filter frame 2 8, the control cylinder 4 drives the mounting plate 5, the connecting rod 6, the filter frame 1 7 and the filter frame 2 8 to move upward, so that the filter frame 1 7 and the filter frame 2 8 extend out of the filter tank 1, and then the filter frame 1 7 and the filter frame 2 8 are manually disassembled from the connecting rod 6, and the impurities in the filter frame 1 7 and the filter frame 2 8 are cleaned. After cleaning, the filter frame 1 7 and the filter frame 2 8 are installed back on the connecting rod 6, and then the control cylinder 4 drives the mounting plate 5, the connecting rod 6, the filter frame 1 7 and the filter frame 2 8 to move downward and reset, and re-extend into the filter tank 1 to prepare for filtering operations.

[0028] There will be oil residue on the impurities in the filter frame 1 7 and the filter frame 2 8. In order to avoid oil waste, before the filter frame 1 7 and the filter frame 2 8 are taken out for cleaning, the air pipe 9 is connected to an air pump to control the air pump to continuously suck out the air under the filter frame 2 8, so that a negative pressure is formed under the filter frame 2 8. In this way, under the action of atmospheric pressure, the oil residue on the impurities in the filter frame 1 7 and the filter frame 2 8 will flow downward to the lower part of the filter tank 1, thereby avoiding oil waste (the working principle is the same as that of the vacuum oil filter for extracting rapeseed oil); the impurities in the filter frame 1 7 are removed and cleaned. The oil will first drip downward onto the impurities in the filter frame 8, and then drip from the impurities in the filter frame 8 to the lower part of the filter tank 1, which increases the difficulty of cleaning the oil on the impurities in the filter frame 8; therefore, a guide groove 101 and a guide groove 701 are provided. When the oil on the impurities in the filter frame 7 flows downward, most of the oil passes through the guide groove 701 and the guide groove 101 in sequence and is diverted to the lower part of the filter tank 1, so as to prevent all the oil from dripping onto the impurities in the filter frame 8, which increases the difficulty of cleaning the oil on the impurities in the filter frame 8.

[0029] Example 2 On the basis of Example 1, Figure 5-Figure 7 As shown, it also includes a block 21, a straight spring 22 and a scraper 23; the filter frame 8 is composed of a retaining ring 801 and a filter plate 802; the retaining ring 801 is slidably connected to the outer edge of the filter plate 802; the filter plate 802 is detachably connected to the filter tank 1; a number of blocks 21 are slidably connected in an annular shape equidistantly inside the retaining ring 801; two straight springs 22 are fixedly connected between each block 21 and the retaining ring 801 respectively; an oblique angle is opened on the upper side of the filter tank 1 to compress the straight spring 22 when forcing the block 21 to extend into the filter tank 1; four scrapers 23 are welded in an annular shape equidistantly inside the retaining ring 801, and in order to facilitate scraping off impurities on the filter plate 802, the cross-section of the scraper 23 is set to an isosceles triangle shape; all scrapers 23 are in contact with the connecting rod 6; all scrapers 23 are in contact with the filter plate 802.

[0030] In order to facilitate the block 21 to extend out from the guide groove 101, the upper side of the block 21 is arranged to be inclined.

[0031] A stopper 24 is also included; a stopper 24 is disposed in each guide groove 101; and there is a gap between the stopper 24 and the side of the guide groove 101 away from the center point of the filter tank 1.

[0032] The impurities filtered by the filter frame 2 8 are relatively small. After a period of use, a large amount of impurities are accumulated, which is more likely to cause blockage than the filter frame 1 7. That is, smaller impurities are more likely to form a dense impurity layer on the filter frame 2 8, hindering the oil from passing through the filter frame 2 8. When the filter frame 1 7 is not completely blocked, the filter frame 2 8 is blocked first. At this time, the filter frame 1 7 needs to be cleaned, that is, when the filter frame 2 8 is not completely blocked, the filter frame 1 7 and the filter frame 2 8 are taken out together for cleaning, and the cleaning frequency is high. Therefore, a clamping block 21, a straight spring 22 and a scraper 23 are provided on the filter frame 2 8. When the clamping block 21 moves downward with the filter frame 2 8 and extends into the filter tank 1, the upper side of the filter tank 1 is set to an inclined shape. When the clamping block 21 contacts the upper side of the filter tank 1, the upper side of the filter tank 1 forces the clamping block 21 to move and compress the straight spring 22. The straight spring 22 The compression accumulates force, and then the block 21 moves into the guide groove 101. Under the elastic force of the straight spring 22, the block 21 moves toward the guide groove 101, so that the block 21 is stuck in the guide groove 101. The block 21 restricts the baffle ring 801 to prevent the baffle ring 801 and the scraper 23 from rotating; then, the control motor 10 drives the mounting plate 5, the connecting rod 6, the filter frame 17 and the filter disc 802 to rotate, and the filter disc 802 moves relative to the baffle ring 801 and the scraper 23, and the scraper 23 will temporarily scrape up the impurities on the filter disc 802, so that the oil can smoothly pass through the filter disc 802 and fall to the lower part of the filter tank 1. In this way, when the filter frame 17 is not completely blocked, the filter frame 28 can still perform filtering operations. When the filter frame 17 is completely blocked, the filter frame 17 and the filter frame 28 are taken out together for cleaning to reduce the frequency of cleaning.

[0033] The impurities are not evenly accumulated on the filter plate 802. The impurities in some areas are thinner, while those in some areas are thicker. When the air pipe 9 is connected to an air pump, the air pump is controlled to continuously suck out the air under the filter frame 2 8, so that a negative pressure is formed under the filter frame 2 8, so that the oil on the impurities in the filter frame 1 7 and the filter frame 2 8 flows downward. When it flows to the lower part of the filter tank 1, the oil on the impurities in the thicker part has a large flow resistance and is difficult to be sucked out by negative pressure, resulting in a waste of oil. Therefore, before the air pump is controlled to continuously suck out the air under the filter frame 2 8, the air cylinder 4 is controlled to drive the mounting plate 5, the connecting rod 6, the filter frame 1 7, the retaining ring 801 and the filter plate 802 to move downward, so that the block 21 on the retaining ring 801 abuts against the block 24, so that the retaining ring 801 The filter disc 802 is blocked and cannot move downward any further. Then, the cylinder 4 is controlled to drive the mounting plate 5, the connecting rod 6, the filter frame 7 and the filter disc 802 to move downward, so that the upper side of the filter disc 802 is in contact with the retaining ring 801 and the scraper 23. After the movement, the filter disc 802 is still in contact with the retaining ring 801, so that the impurities on the filter disc 802 are located between the upper side of the filter disc 802 and the scraper 23. Then, the motor 10 is controlled to drive the mounting plate 5, the connecting rod 6, the filter frame 7 and the filter disc 802 to rotate. The filter disc 802 moves relative to the retaining ring 801 and the scraper 23, and the scraper 23 will scrape the impurities on the filter disc 802 flat to prevent the impurities in some areas from accumulating too thickly and affecting the suction. Then, negative pressure suction is performed to suck the oil on the impurities to avoid oil waste.

[0034] The impurities on the filter disc 802 are relatively small, and after negative pressure suction, some of the impurities will be stuck in the filter holes of the filter disc 802. When the filter disc 802 is taken out for cleaning, it takes a lot of effort to clean out the impurities stuck in the filter holes of the filter disc 802; therefore, after completing the suction operation, the air pump can be controlled to continuously pass high-pressure gas into the bottom of the filter frame 8 through the air pipe 9. The high-pressure gas will flow upward and flush out the impurities stuck in the filter holes of the filter disc 802 to facilitate subsequent cleaning.

[0035] Example 3 On the basis of Example 2, Figure 3 and Figure 5-Figure 7 As shown, it also includes fixing rods 31 and scraping strips 32 ; two fixing rods 31 are fixedly connected to the lower side of the retaining ring 801 ; the lower ends of all the fixing rods 31 are commonly fixedly connected to the scraping strips 32 ; the scraping strips 32 are in contact with the filter disc 802 .

[0036] In order to facilitate the oil to fall, the scraper strip 32 is provided with a plurality of vertical grooves.

[0037] It also includes a strip 33; a strip 33 is fixedly connected to the lower side of the filter disc 802; and the scraper strip 32 is set to be made of elastic rubber material.

[0038] The air pipe 9 is connected to an air pump externally, and the air pump is controlled to suck out the air under the filter frame 2 8, so that a negative pressure is formed under the filter frame 2 8. In this way, under the action of atmospheric pressure, the oil on the impurities in the filter frame 1 7 and the filter frame 2 8 will flow downward and flow to the lower part of the filter tank 1; after completing the above-mentioned actions, some oil will remain on the lower side of the filter frame 1 7 and the filter frame 2 8. Since the impurities in the filter frame 2 8 are finer, more oil will remain, so that more oil will flow up and down from the impurities in the filter frame 2 8, resulting in more oil remaining on the lower side of the filter frame 2 8. Therefore, it is necessary to perform specific cleaning on the oil on the lower side of the filter frame 2 8 to prevent oil waste; at this time, the control motor 10 drives the installation The plate 5, the connecting rod 6, the filter frame 7 and the filter disc 802 rotate, the filter disc 802 moves relative to the retaining ring 801 and the scraper 23, and the scraper bar 32 is fixedly connected to the retaining ring 801 through the fixing rod 31. Therefore, the lower side of the filter disc 802 will also rotate relative to the scraper bar 32, and the scraper bar 32 can scrape off the residual oil on the lower side of the filter disc 802, and then fall along the scraper bar 32 to the lower part of the filter tank 1, so as to avoid the residual oil on the lower side of the filter frame 8 and cause waste; when the filter disc 802 rotates, it will drive the shift bar 33 to rotate. When the shift bar 33 rotates and passes through the scraper bar 32, the shift bar 33 will shift the scraper bar 32, causing the scraper bar 32 to deform and shake, so that the oil on the scraper bar 32 is shaken off to avoid oil residue.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-clogging double-stage vacuum oil filter, comprising a filter tank (1), a double-stage vacuum oil filter (2) and an electric control valve (3); the double-stage vacuum oil filter (2) is arranged on the side of the filter tank (1), and the double-stage vacuum oil filter (2) is used to remove moisture and gas in oil; an electric control valve (3) is arranged between the filter tank (1) and the double-stage vacuum oil filter (2); the characteristics are: The invention also comprises a cylinder (4), a mounting plate (5), a connecting rod (6), a filter frame 1 (7), a filter frame 2 (8) and an air pipe (9); a plurality of cylinders (4) are fixedly connected to the filter tank (1); the telescopic ends of all the cylinders (4) are fixedly connected to the mounting plate (5); the mounting plate (5) is connected to the connecting rod (6); the lower part of the connecting rod (6) is detachably connected to the filter frame 1 (7) and the filter frame 2 (8); the filter frame 1 (7) is located above the filter frame 2 (8); the filter hole diameter of the filter frame 1 (7) is larger than the filter hole diameter of the filter frame 2 (8); the filter frame 1 (7) and the filter frame 2 (8) are both in contact with the inner wall of the filter tank (1); the lower part of the filter tank (1) is connected to the air pipe (9), and the air pipe (9) is located below the filter frame 2 (8).

2. The anti-clogging double-stage vacuum oil filter according to claim 1, characterized in that: A filter membrane is provided at one end of the air pipe (9) facing the filter tank (1).

3. The anti-clogging double-stage vacuum oil filter according to claim 1, characterized in that: It also includes a motor (10); the motor (10) is fixedly connected to the mounting plate (5); and the output shaft of the motor (10) is fixedly connected to the connecting rod (6).

4. The anti-clogging double-stage vacuum oil filter according to claim 3 is characterized in that: The lower side of the filter frame 1 (7) is concave upward, and the concave shape is conical; the inner wall of the filter tank (1) is provided with a plurality of guide grooves 1 (101) at equal intervals in a circular shape; the lower side of the filter frame 1 (7) is provided with a plurality of guide grooves 2 (701) at equal intervals in a circular shape; each guide groove 1 (101) is connected to a guide groove 2 (701); the lower end of the guide groove 1 (101) is located below the filter frame 2 (8).

5. The anti-clogging double-stage vacuum oil filter according to claim 4, characterized in that: The filter frame (8) further comprises a clamping block (21), a straight spring (22) and a scraper (23); the second filter frame (8) comprises a retaining ring (801) and a filter plate (802); the retaining ring (801) is slidably connected to the outer edge of the filter plate (802); the filter plate (802) is detachably connected to the filter tank (1); a plurality of clamping blocks (21) are slidably connected in an annular manner at equal intervals inside the retaining ring (801); a plurality of straight springs (22) are respectively fixedly connected between each clamping block (21) and the retaining ring (801); an oblique angle is formed on the upper side of the filter tank (1); a plurality of scrapers (23) are fixedly connected in an annular manner at equal intervals inside the retaining ring (801); all the scrapers (23) are in contact with the connecting rod (6); and all the scrapers (23) are in contact with the filter plate (802).

6. The anti-clogging double-stage vacuum oil filter according to claim 5, characterized in that: The upper side of the clamping block (21) is arranged in an inclined shape.

7. The anti-clogging double-stage vacuum oil filter according to claim 5, characterized in that: It also includes a stopper (24); a stopper (24) is provided in each guide groove one (101); and a gap exists between the stopper (24) and a side of the guide groove one (101) away from the center point of the filter tank (1).

8. The anti-clogging double-stage vacuum oil filter according to claim 7, characterized in that: It also includes fixed rods (31) and scraper strips (32); a plurality of fixed rods (31) are fixedly connected to the lower side of the retaining ring (801); the scraper strips (32) are commonly fixedly connected to the lower ends of all the fixed rods (31); and the scraper strips (32) are in contact with the filter disc (802).

9. The anti-clogging double-stage vacuum oil filter according to claim 8, characterized in that: The scraper strip (32) is provided with a plurality of vertical grooves.

10. The anti-clogging double-stage vacuum oil filter according to claim 8, characterized in that: It also includes a pull bar (33); a pull bar (33) is fixedly connected to the lower side of the filter plate (802); and the scraper bar (32) is made of elastic rubber material.

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