A turtleback filter for removing impurities from crude grease

Abstract

The present invention relates to a turtle-back filter for removing impurities of crude grease applied in the field of filtration, comprising a filter housing, a turtle-back sealing rotary cover connected to a rotational seal with the upper end of the filter housing, an oil inlet pipe connected below the turtle-back sealing rotary cover, a steam pipe connected above the oil inlet pipe, and a sewage pipe connected to the bottom of the filter housing. The grease is first double-filtered by using a support tube and a filter cartridge, and the impurities are naturally allowed to sink to the bottom of the filter cartridge by using the precipitation effect of impurities. Then, the isolation-type sewage discharger is regulated so that the upper and lower deformable pipe covers are deformed back and forth, so that the impurities are isolated and discharged, and online cleaning is achieved, which can effectively avoid disturbance of the grease, thereby effectively improving the filtering effect. Steam purging is also used to regularly clean the filter cartridge, and steam is pre-stored through a purging compensator. During steam purging, the pre-stored steam can be automatically released to blow toward the filter cartridge, thereby effectively compensating for insufficient steam purging force, thereby effectively improving the purging effect.

Description

Technical Field

[0001] The present invention relates to a tortoise-back filter for removing impurities from crude grease, in particular to a tortoise-back filter for removing impurities from crude grease applied in the field of filtration. Background Art

[0002] The main function of the grease removal filter is to remove impurities from grease to ensure the purity and safety of the grease. In order to maintain efficient filtering effects, the filters currently on the market all have an automatic cleaning function.

[0003] For example, a filter device for oil production with publication number CN221155713U uses a brush to clean the barrel wall, but the bristles on the brush will fall into the oil, affecting the quality of the oil. Therefore, there is a method of cleaning by steam blowing in the prior art, such as a filter with a steam blowing device with publication number CN219441040U, which uses steam blowing to clean the filter component.

[0004] Although existing technologies have disclosed methods for online cleaning of filters, the grease will be stirred during cleaning, causing the grease and impurities to mix more thoroughly, which in turn reduces the filtration efficiency. Moreover, during steam blowing, if impurities are stuck on the filter and the steam pressure is insufficient, the cleaning effect will not meet the standards. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to clean the filter screen online during filtration and to compensate for the problem of insufficient pressure during steam purging.

[0006] In order to solve the above problems, the present invention provides a turtle-back filter for removing crude grease, comprising a filter housing, a turtle-back sealing rotary cover connected to a rotational seal with the upper end of the filter housing, an oil inlet pipe connected to the bottom of the turtle-back sealing rotary cover, a steam pipe connected to the top of the oil inlet pipe, a drain pipe connected to the bottom of the filter housing, and an oil outlet pipe connected to the side of the drain pipe. The inner wall of the turtle-back sealing rotary cover is provided with an oil passage connected to the oil inlet pipe, and the oil inlet pipe and the oil passage are sealed and connected by a flange. A steam purge device connected to the steam pipe is also provided on the outside of the filter housing. A support cylinder with a pore size of 0.5-1 mm is placed inside the filter housing, and a filter cartridge is placed inside the support cylinder. A plurality of ultrasonic vibrators distributed at equal intervals are installed on the inner side wall of the support cylinder, and the vibrating surface of the ultrasonic vibrator is in contact with the filter cartridge. A plurality of matching pressure differential sensors are installed on the inner wall of the filter housing and the inner wall of the filter cartridge, and the pressure differential sensor is connected to the steam purge device signal through a control processor.

[0007] In the above-mentioned turtleback filter for crude grease removal, the precipitation of impurities is utilized to allow them to sink, and then the settled impurities are isolated and discharged through an isolation drain, thereby achieving the effect of online cleaning, and regular cleaning is carried out in conjunction with steam blowing, which can also compensate for the lack of steam pressure and effectively improve the blowing effect.

[0008] As a further improvement of the present application, the lower end of the turtle-back sealing rotary cover is fixedly connected to a purge compensator coaxial with the filter cartridge, and the lower end of the purge compensator is fixedly connected to an isolation-type drainer. The bottom of the filter cartridge is connected to a slag discharge pipe extending into the drain pipe, and the bottom of the support tube is provided with a perforation matching the slag discharge pipe, and the isolation-type drainer passes through the interior of the slag discharge pipe.

[0009] As a further improvement of the present application, a solid bottom cylinder is fixedly embedded in the bottom of the filter cartridge, and the mesh number of the filter cartridge is 500-800 meshes.

[0010] As a further improvement of the present application, the isolated sewage discharger includes three sections of deformable push rods, namely upper, middle and lower sections, and a deformable pipe blocking cover fixedly connected between two adjacent deformable push rods. The upper deformable pipe blocking cover is arranged near the upper port of the slag discharge pipe, the middle section deformable push rod is made of magnetic material, and the upper and lower sections deformable push rods are made of electromagnetic material. A pressure sensor is installed on the side wall of the middle section deformable push rod near the lower deformable pipe blocking cover, and the pressure sensor is connected to the signals of the upper and lower sections deformable push rods. The inner wall of the middle section deformable push rod is also slidably connected to a push rod, and the upper and lower ends of the push rod are respectively in contact with the upper and lower sections deformable push rods.

[0011] As another improvement of the present application, the modified pipe blocking cover includes an elliptical pressure-resistant cover and multiple groups of elastic plastic diaphragms symmetrically distributed up and down embedded in the pressure-resistant cover, and a connecting pin is rotatably connected between two elastic plastic diaphragms in the same group.

[0012] As another improved supplement to the present application, the purge compensator includes an elastic airbag in the middle and hard bag heads connected to the upper and lower ends of the elastic airbag, and the inner wall of the upper hard bag head is provided with a vent hole connected to the elastic airbag, the inner wall of the turtleback sealing screw cover is provided with a steam channel connected to the vent hole and the oil channel at the same time, and an electromagnetic valve is installed inside the steam channel, and the side wall of the elastic airbag is fixedly inlaid with multiple self-opening and closing air release valves distributed at equal intervals, and a valve opening belt is connected between the two opposite self-opening and closing air release valves.

[0013] As another improved supplement to the present application, the self-opening and closing air release valve includes a valve seat fixedly connected to the inner and outer walls of the elastic airbag, a positioning ring fixedly connected between the two valve seats, and a sealing plate hinged to the positioning ring through a damping hinge. The sealing plate is magnetically connected to the positioning ring, and the opening direction of the sealing plate is toward the interior of the elastic airbag.

[0014] As another improvement of the present application, the valve opening belt includes an elastic belt and an inelastic belt inserted inside the elastic belt, and the length of the inelastic belt is greater than that of the elastic belt.

[0015] To sum up, the support tube and filter cartridge are first used to perform double filtration on the grease, and the impurities are allowed to naturally sink to the bottom of the filter cartridge by the precipitation effect of impurities. Then, the isolation type sewage discharger is regulated to make its upper and lower deformable pipe covers deform forward and backward, so as to isolate and discharge the impurities, realize online cleaning, and effectively avoid disturbance of the grease, thereby effectively improving the filtering effect. Steam blowing is also used to regularly clean the filter cartridge, and the purge compensator is used to pre-store steam. During steam blowing, the pre-stored steam can be automatically released to blow to the filter cartridge, thereby effectively compensating for the lack of steam blowing force, thereby effectively improving the blowing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional exploded view of the filter according to the first embodiment of the present application;

[0017] Figure 2 This is a front cross-sectional view of a filter according to a second embodiment of the present application;

[0018] Figure 3 A perspective view of a purge compensator and an isolated blowdown device according to a third embodiment of the present application;

[0019] Figure 4 This is a dynamic change diagram of the isolated sewage discharger of the second embodiment of the present application during isolation and sewage discharge;

[0020] Figure 5 This is a front cross-sectional view of a modified pipe blocking cover according to the second embodiment of the present application;

[0021] Figure 6 This is a dynamic change diagram of the purge compensator in the third embodiment of the present application when pre-storing steam;

[0022] Figure 7 This is a three-dimensional diagram of a self-opening and closing air release valve according to a third embodiment of the present application;

[0023] Figure 8 This is a valve opening diagram of the third embodiment of the present application.

[0024] Description of the numbers in the figure:

[0025] 1 filter housing, 2 turtleback sealing screw cap, 201 oil channel, 202 steam channel, 3 oil inlet pipe, 4 steam pipe, 5 sewage pipe, 6 oil outlet pipe, 7 support cylinder, 8 filter cartridge, 801 solid bottom cylinder, 9 differential pressure sensor, 10 ultrasonic vibrator, 11 purge compensator, 1101 elastic air bag, 1102 hard bag head, 12 isolation type sewage device, 1201 deformable push rod, 1202 deformable pipe plugging cover, 12021 pressure cover, 12022 elastic plastic diaphragm, 12023 connecting pin, 1203 push rod, 1204 pressure sensor, 13 slag discharge pipe, 14 self-opening and closing air release valve, 1401 valve seat, 1402 positioning ring, 1403 sealing disc, 15 valve opening belt, 1501 elastic belt, 1502 non-elastic belt. DETAILED DESCRIPTION

[0026] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0027] The first implementation method:

[0028] like Figure 1 、 2 As shown, it includes a filter housing 1, a turtle-back sealed rotary cover 2 that is rotatably connected to the upper end of the filter housing 1, an oil inlet pipe 3 connected to the bottom of the turtle-back sealed rotary cover 2, a steam pipe 4 connected to the top of the oil inlet pipe 3, a sewage pipe 5 connected to the bottom of the filter housing 1, and an oil outlet pipe 6 connected to the side of the sewage pipe 5. The inner wall of the turtle-back sealed rotary cover 2 is provided with an oil passage 201 connected to the oil inlet pipe 3, and the oil inlet pipe 3 and the oil passage 201 are sealed by a flange. The outside of the filter housing 1 is also provided with a steam purge device connected to the steam pipe 4 (this is the prior art, and the specific working principle and structure are not described in detail here). The interior of the filter housing 1 is placed There is a support tube 7 with a pore size of 0.5-1 mm, and a filter cartridge 8 is placed inside the support tube 7. A plurality of ultrasonic vibrators 10 (the specific model is selected according to actual needs) are installed on the inner side wall of the support tube 7 and are distributed around the support tube 7 at equal intervals. The vibration surface of the ultrasonic vibrator 10 is in contact with the filter cartridge 8. The inner wall of the filter housing 1 and the inner wall of the filter cartridge 8 are both installed with a plurality of sets of matching differential pressure sensors 9 (the specific model is selected according to actual needs). The differential pressure sensors 9 are connected to the steam purge device through a control processor (the specific control principle and structure of this part are well known to technicians in the relevant field and will not be described in detail here);

[0029] like Figure 2As shown, during specific filtration, crude grease enters the interior of the filter through the oil inlet pipe 3 and the oil passage 201, and the crude grease is filtered through the filter cartridge 8 and the support cylinder 7. Impurities are trapped in the interior of the filter cartridge 8, and the filtered grease is discharged from the oil outlet pipe 6. Most of the water and impurities in the grease are deposited at the bottom of the drain pipe 5 and discharged from the drain pipe 5. During filtration, the differential pressure sensor 9 detects the pressure inside and outside the filter cartridge 8 in real time. If the internal and external pressure difference exceeds the set threshold, it indicates that the filter cartridge 8 is clogged. Therefore, the differential pressure sensor 9 starts the steam purge device through the control processor to purge and clean the filter cartridge 8. In addition, the ultrasonic vibrator 10 is also started to vibrate the filter cartridge 8 during the purge, thereby effectively improving the cleaning effect.

[0030] This embodiment mainly utilizes the filter cartridge 8 to filter the crude grease, and regularly cleans the filter cartridge 8 in conjunction with steam blowing, thereby eliminating the trouble of disassembly and cleaning, and effectively maintaining the high-efficiency filtering state of the filter cartridge 8.

[0031] Second implementation method:

[0032] This embodiment further improves the cleaning method of the filter cartridge 8 on the basis of the first embodiment, effectively improving the cleaning efficiency, while other parts remain consistent with the first embodiment;

[0033] like Figure 2 As shown, the lower end of the turtleback sealing rotary cover 2 is fixedly connected to a purge compensator 11 coaxial with the filter cartridge 8, and the lower end of the purge compensator 11 is fixedly connected to an isolation type drain device 12. The bottom of the filter cartridge 8 is connected to a slag discharge pipe 13 extending into the drain pipe 5, and the bottom of the support cylinder 7 is provided with a through hole matching the slag discharge pipe 13. The isolation type drain device 12 passes through the interior of the slag discharge pipe 13. The bottom of the filter cartridge 8 is fixedly inlaid with a solid bottom cylinder 801, and the mesh number of the filter cartridge 8 is 500-800 mesh.

[0034] like Figure 3 、 4 As shown, the isolated sewage discharger 12 includes three sections of deformable pushing rods 1201, namely, upper, middle and lower sections, and a deformable pipe blocking cover 1202 fixedly connected between two adjacent deformable pushing rods 1201. The upper deformable pipe blocking cover 1202 is arranged near the upper port of the slag discharge pipe 13. The middle section deformable pushing rod 1201 is made of magnetic material, and the upper and lower sections of the deformable pushing rods 1201 are made of electromagnetic material. A pressure sensor 1204 (the specific model is selected according to actual needs) is installed on the side wall of the middle section deformable pushing rod 1201 near the lower deformable pipe blocking cover 1202. The pressure sensor 1204 is connected to the upper and lower sections of the deformable pushing rods 1201 by signal. The inner wall of the middle section deformable pushing rod 1201 is also slidably connected to a push rod 1203, and the upper and lower ends of the push rod 1203 are respectively in contact with the upper and lower sections of the deformable pushing rods 1201.

[0035] like Figure 4 As shown, the specific operation of the isolated sewage device 12 is as follows: while the filter cartridge 8 is filtering the grease, the water and impurities in the grease are denser than the grease and therefore settle at the bottom of the solid bottom cartridge 801. In the filtering state, the deformable push rod 1201 of the lower section is energized to generate a magnetic attraction to the deformable push rod 1201 of the middle section. Under the magnetic attraction, the deformable push rod 1201 of the lower section moves upward, thereby causing the deformable plugging pipe cover 1202 below to deform and expand. After the deformation of the deformable plugging pipe cover 1202 below expands, it tightly adheres to the inner wall of the slag discharge pipe 13 to form a sealing barrier, while the deformable push rod 1201 of the upper section is moved upward. 1. When power is not supplied, the upper deformable pipe blocking cover 1202 naturally sags and contracts, so that the precipitated water and impurities will sink onto the lower deformable pipe blocking cover 1202. When in the cleaning state, the upper deformable pushing rod 1201 is energized, while the lower deformable pushing rod 1201 is de-energized, so that the upper and lower deformable pipe blocking covers 1202 can switch their states. The upper deformable pipe blocking cover 1202 intercepts the grease, and the lower deformable pipe blocking cover 1202 opens the channel to let the water and impurities naturally fall to the bottom of the sewage pipe 5 and be discharged. In this way, the impurities can be cleaned online and the grease can be effectively prevented from being carried out.

[0036] In addition, the role of the push rod 1203 is that when the upper and lower deformable pipe blocking covers 1202 are switched in state, the upper and lower deformable push rods 1201 can resist the push rod 1203 to ensure that the upper and lower deformable pipe blocking covers 1202 are in different states, thereby preventing the two deformable pipe blocking covers 1202 from being closed at the same time and hindering the discharge of impurities. During the steam purging stage, the upper and lower deformable push rods 1201 are simultaneously powered off, so that the upper and lower deformable pipe blocking covers 1202 are in a naturally drooping state, so that the impurities and water blown down can be continuously discharged;

[0037] In addition, the pressure sensor 1204 is used to detect the pressure of the settled impurities and water. When the pressure reaches the set threshold, the pressure sensor 1204 can automatically control the power on and off status of the upper and lower deformable push rods 1201 to discharge the sewage in time, so as to prevent the accumulation of impurities from affecting the filtering effect.

[0038] like Figure 5As shown, the deformable pipe blocking cover 1202 includes an elliptical pressure-resistant cover 12021 (preferably made of rubber material, and other materials can also be selected according to actual needs), and multiple groups of elastic plastic diaphragms 12022 (preferably made of polyurethane elastic material, and other materials can also be selected according to actual needs) symmetrically distributed up and down and embedded in the pressure-resistant cover 12021, and a connecting pin 12023 is rotatably connected between the two elastic plastic diaphragms 12022 in the same group. When the deformable pipe blocking cover 1202 is squeezed by the deformable push rod 1201, the two relative elastic plastic diaphragms 12022 rotate with each other around the middle connecting pin 12023, so that the entire deformable pipe blocking cover 1202 is deformed into an ellipsoid, so that the deformable pipe blocking cover 1202 can block the slag discharge pipe 13.

[0039] This embodiment realizes isolated sewage discharge by controlling the deformation of the upper and lower deformable pipe covers 1202, effectively avoiding a large amount of grease being carried out when cleaning impurities, thereby avoiding waste, and most importantly, realizing online cleaning, effectively maintaining the high filtration efficiency of the filter cartridge 8, and at the same time eliminating the trouble of regularly disassembling the filter cartridge 8 for cleaning.

[0040] The third implementation method:

[0041] Based on the first and second embodiments, this embodiment further improves the steam purge by using a purge compensator 11 to compensate for the problem of insufficient blowing force during steam purge. The rest of the embodiments remain the same as the first embodiment.

[0042] like Figure 3 、 6 As shown, the purge compensator 11 includes a middle elastic airbag 1101 (preferably made of high-temperature resistant rubber material, and other materials can also be selected according to actual needs), and hard bag heads 1102 connected to the upper and lower ends of the elastic airbag 1101, and the inner wall of the upper hard bag head 1102 is provided with a vent hole connected to the elastic airbag 1101, the inner wall of the turtle-back sealing screw cover 2 is provided with a steam channel 202 connected to the vent hole and the oil channel 201 at the same time, and a solenoid valve (the specific model is selected according to actual needs) is installed inside the steam channel 202, and the side wall of the elastic airbag 1101 is fixedly inlaid with a plurality of self-opening and closing air release valves 14 distributed around at equal intervals, and a valve opening belt 15 is connected between the two opposite self-opening and closing air release valves 14;

[0043] like Figure 7As shown, the self-opening and closing air release valve 14 includes a valve seat 1401 fixedly connected to the inner and outer walls of the elastic airbag 1101, a positioning ring 1402 fixedly connected between the two valve seats 1401, and a sealing plate 1403 hinged to the positioning ring 1402 via a damping hinge. The sealing plate 1403 is magnetically connected to the positioning ring 1402, and the opening direction of the sealing plate 1403 is toward the interior of the elastic airbag 1101;

[0044] like Figure 6 As shown, the working process of the purge compensator 11 is as follows: during the periodic cleaning process by steam purge, the solenoid valve inside the steam channel 202 is first opened to allow the steam entering from the steam pipe 4 and the oil passage 201 to enter the interior of the purge compensator 11 along the steam channel 202. In the initial state, the sealing piece 1403 is magnetically adsorbed on the positioning ring 1402 to achieve the sealing of the purge compensator 11. When the steam enters the interior of the purge compensator 11, the purge compensator 11 continues to expand and grow. As the purge compensator 11 is purge, the compensator 11 expands and expands. The expansion increases the distance between the two relative self-opening and closing air release valves 14, and then gradually straightens the valve opening belt 15. When the distance between the two relative sealing sheets 1403 increases to exceed the length of the inelastic band 1502, the pulling action of the valve opening belt 15 causes the sealing sheets 1403 to be pulled open, thereby releasing the steam. Since the elastic airbag 1101 is elastic, the elasticity of the elastic airbag 1101 will act on the steam when releasing the steam, thereby increasing the steam blowing force on the filter cartridge 8, thereby effectively improving the steam blowing effect.

[0045] like Figure 8 As shown, the valve opening belt 15 includes an elastic belt 1501 and an inelastic belt 1502 inserted inside the elastic belt 1501, and the length of the inelastic belt 1502 is greater than the length of the elastic belt 1501. The elastic belt 1501 plays the role of wrapping and protecting the inelastic belt 1502, and the inelastic belt 1502 can pull the sealing sheet 1403 away from the positioning ring 1402 after the distance between the two opposite sealing sheets 1403 exceeds its own length, thereby releasing steam.

[0046] This embodiment mainly takes into account the possibility of insufficient steam pressure during steam purging, and uses the purge compensator 11 to compensate for the steam purge force, thereby effectively improving the purge effect on the filter cartridge 8, especially when the filter cartridge 8 is severely clogged, which can effectively improve the cleaning effect.

[0047] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A turtleback filter for removing impurities from crude grease, characterized by: The invention comprises a filter housing (1), a turtle-back sealing rotary cover (2) connected to the upper end of the filter housing (1) in a rotary sealing manner, an oil inlet pipe (3) connected to the lower part of the turtle-back sealing rotary cover (2), a steam pipe (4) connected to the upper part of the oil inlet pipe (3), a sewage pipe (5) connected to the bottom of the filter housing (1), and an oil outlet pipe (6) connected to the side of the sewage pipe (5), wherein the inner wall of the turtle-back sealing rotary cover (2) is provided with an oil passage (201) connected to the oil inlet pipe (3), and the oil inlet pipe (3) and the oil passage (201) are connected in a sealing manner via a flange. The outer part of the filter housing (1) is also provided with a A steam purge device is provided which is connected to a steam pipe (4); a support cylinder (7) having a pore size of 0.5-1 mm is placed inside the filter housing (1); a filter cartridge (8) is placed inside the support cylinder (7); a plurality of ultrasonic vibrators (10) are installed on the inner side wall of the support cylinder (7) and are distributed around the filter cartridge (8) at equal intervals; and a vibration surface of the ultrasonic vibrator (10) contacts the filter cartridge (8); a plurality of sets of matching differential pressure sensors (9) are installed on the inner wall of the filter housing (1) and the inner wall of the filter cartridge (8), and the differential pressure sensors (9) are connected to the steam purge device signal through a control processor; The lower end of the turtle-back sealing rotary cover (2) is fixedly connected to a purge compensator (11) coaxial with the filter cartridge (8), and the lower end of the purge compensator (11) is fixedly connected to an isolation type drainer (12), the bottom of the filter cartridge (8) is connected to a slag discharge pipe (13) extending into the drain pipe (5), and the bottom of the support cylinder (7) is provided with a through hole matching the slag discharge pipe (13), and the isolation type drainer (12) penetrates into the interior of the slag discharge pipe (13); The purge compensator (11) comprises an elastic airbag (1101) in the middle and hard airbag heads (1102) connected to the upper and lower ends of the elastic airbag (1101); a plurality of self-opening and closing air release valves (14) distributed around the elastic airbag (1101) are fixedly embedded on the side wall of the elastic airbag (1101), and a valve opening belt (15) is connected between two opposing self-opening and closing air release valves (14); The isolated sewage discharger (12) comprises three sections of deformable push rods (1201), namely, upper, middle and lower sections, and a deformable pipe blocking cover (1202) fixedly connected between two adjacent deformable push rods (1201); the upper deformable pipe blocking cover (1202) is arranged near the upper end of the slag discharge pipe (13); the middle section deformable push rod (1201) is made of magnetic material, and the upper and lower sections deformable push rods (1201) are made of electromagnetic material; a pressure sensor (1204) is installed on the side wall of the middle section deformable push rod (1201) near the lower deformable pipe blocking cover (1202); the pressure sensor (1204) is signal-connected to the upper and lower sections deformable push rods (1201); a push rod (1203) is also slidably connected to the inner wall of the middle section deformable push rod (1201), and the upper and lower ends of the push rod (1203) are in contact with the upper and lower sections deformable push rods (1201) respectively; The modified pipe blocking cover (1202) comprises an elliptical pressure-resistant cover (12021) and a plurality of groups of elastic plastic diaphragms (12022) symmetrically distributed vertically and embedded in the pressure-resistant cover (12021), and a connecting pin (12023) is rotatably connected between two elastic plastic diaphragms (12022) in the same group.

2. The turtleback filter for removing impurities from crude grease according to claim 1, characterized in that: A solid bottom cylinder (801) is fixedly embedded at the bottom of the filter cylinder (8), and the mesh number of the filter cylinder (8) is 500-800 meshes.

3. The turtleback filter for removing impurities from crude grease according to claim 1, characterized in that: The inner wall of the upper hard bag head (1102) is provided with a vent hole connected to the elastic air bag (1101), and the inner wall of the turtle-back sealing screw cap (2) is provided with a steam channel (202) connected to both the vent hole and the oil channel (201), and a solenoid valve is installed inside the steam channel (202).

4. The turtleback filter for removing impurities from crude grease according to claim 1, characterized in that: The self-opening and closing air release valve (14) comprises a valve seat (1401) fixedly connected to the inner and outer walls of the elastic airbag (1101), a positioning ring (1402) fixedly connected between the two valve seats (1401), and a sealing plate (1403) hinged to the positioning ring (1402) via a damping hinge. The sealing plate (1403) is magnetically connected to the positioning ring (1402), and the opening direction of the sealing plate (1403) is toward the interior of the elastic airbag (1101).

5. The turtleback filter for removing impurities from crude grease according to claim 1, characterized in that: The valve opening belt (15) comprises an elastic belt (1501) and an inelastic belt (1502) inserted into the elastic belt (1501), and the length of the inelastic belt (1502) is greater than the length of the elastic belt (1501).

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