Sealed oil purification system

Abstract

The utility model discloses a sealed oil purification system, including the oil tank still includes the heating system of first grade, heating system of second grade, centrifugal system, dehydration system, fine filter system that sets downstream of oil tank gradually, heating system of second grade with centrifugal system, dehydration system, fine filter system circulation intercommunication. The utility model has the beneficial effects that: through heating circulation delivery of the dirty oil of heating system of first grade, heating system of second grade, through the cooperation of centrifugal system, dehydration system, fine filter system, realize the filtration recovery and self -cleaning of dirty oil. Improve work efficiency, and promote the quality of dirty oil recovery.

Description

Technical Field

[0001] This utility model relates to the field of rubber product manufacturing technology, and in particular to a sealing oil purification system. Background Technology

[0002] Internal mixer rubber mixing is the first step in rubber product manufacturing. To ensure lubrication of the bearings at both ends of the rotor during internal mixer operation and to prevent dust leakage from the moving and stationary rings of the internal mixer from affecting the surrounding environment, internal mixers are equipped with a device to pump sealing oil to the rotor. However, due to the working environment of internal mixer rubber mixing, the sealing oil returning from the internal mixer becomes sludge mixed with a large amount of impurities such as iron filings, rubber sludge, and carbon black dust. This sludge is different from conventional sludge; it contains many impurities and is very viscous, making it impossible to directly recycle or purify.

[0003] Currently, the commonly used method for treating oily waste involves collecting the oil and then applying high temperatures for static filtration. This method consumes a large amount of filter media, has high processing costs, requires significant labor, and generates a large amount of hazardous waste, especially discarded filter cartridges, causing secondary pollution. Furthermore, the prolonged high temperatures affect the oil quality, resulting in a low pass rate for the filtered oil, making it difficult to reuse. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical defects and propose a sealing oil purification system.

[0005] The technical solution adopted by this utility model to achieve its technical objective is as follows:

[0006] The sealing oil purification system includes a primary heating system, a secondary heating system, a centrifugal system for centrifugal impurity removal, a dehydration system for removing moisture from sludge, and a fine filtration system. The oil inlet of the primary heating system is connected to an oil pipeline for transporting sludge, and the primary heating system heats the sludge to a preset temperature. The oil outlet of the primary heating system is connected to the oil inlet of the secondary heating system, and the secondary heating system stores the sludge and provides supplemental heating to maintain the oil temperature at the preset temperature. The oil outlet of the secondary heating system is connected to the oil inlet of the centrifugal system, the oil outlet of the centrifugal system is connected to the oil inlet of the dehydration system, and the oil outlet of the dehydration system is connected to the oil inlet of the fine filtration system to transport the sludge into the fine filtration system for physical filtration.

[0007] Preferably, the primary heating system includes a mixing tank, a circulating oil pump, and a first heater. The mixing tank is equipped with a temperature sensor, a liquid level sensor, and a pressure sensor. An electromagnetic pneumatic valve is also provided between the oil tank and the mixing tank. The first heater is a pipeline heater located outside the mixing tank. The oil inlet and oil outlet of the first heater are respectively connected to the mixing tank. The circulating oil pump is used to drive the sludge oil in the mixing tank to circulate into the first heater for heating.

[0008] Preferably, the secondary heating system includes a circulation tank, a circulation oil pump, and a second heater. The circulation tank is equipped with a temperature sensor, a liquid level sensor, and an electromagnetic vent valve. An oil inlet pneumatic valve is also provided between the circulation tank and the stirring tank. The second heater is a pipeline heater located outside the circulation tank. The oil inlet and outlet of the second heater are respectively connected to the circulation tank. The circulation oil pump is used to drive the sludge oil in the circulation tank to circulate into the second heater for heating.

[0009] Preferably, the centrifugal system includes a centrifugal mechanism and an automatic slag discharge mechanism;

[0010] The centrifugation mechanism includes a centrifuge base, a drum below the centrifuge base, a drum bearing chamber above the drum base, a drum shaft fitted inside the drum bearing chamber, the lower end of the drum shaft connected to the drum, the upper end extending upward and out of the drum bearing chamber, a drum synchronous pulley fitted at the top of the drum bearing chamber, a support frame outside the drum bearing chamber, a drum servo motor mounted on the support frame, a drum servo motor synchronous pulley mounted on the output shaft of the drum servo motor, and the drum synchronous pulley connected to the drum servo motor synchronous pulley via a belt.

[0011] The automatic slag discharge mechanism includes a slag discharge reduction motor, which is equipped with a drive shaft. The upper end of the drive shaft is equipped with an opening and closing cylinder, and the lower end is equipped with an upper shift fork. The drum shaft is hollow and has a high-speed bearing inside. A scraper shaft is equipped inside the high-speed bearing. The upper end of the scraper shaft is equipped with the upper shift fork via a lower shift fork, and the lower end extends into the drum. A rotating scraper is provided inside the drum and at the lower end of the scraper shaft.

[0012] A locking cylinder is also provided on the centrifuge base and on one side of the drum bearing chamber. The piston rod of the locking cylinder is provided with a locking pin at its end, and the top of the drum is provided with a pin hole. The locking pin can be inserted into the pin hole to lock the drum.

[0013] Preferably, the dehydration system includes an intermediate tank and a flash dehydration device, the flash dehydration device includes a dehydration tank, a dehydration oil supply pump is provided between the intermediate tank and the dehydration tank, and a cooling fan is provided above the dehydration tank;

[0014] The dehydration tank includes a tank body, an insulating sheet metal layer on the outside of the tank body, and insulating cotton between the tank body and the insulating sheet metal layer; the top of the tank body has a vertically perpendicular oil inlet and a vacuum port, the bottom has a drain pipe, a vent valve and an instrument interface are provided on the tank body below the oil inlet and the vacuum port, and an oil outlet is provided on the tank body above the drain pipe;

[0015] Inside the tank, connected to the oil inlet, is a reducing pipe. The lower end of the reducing pipe is connected to a spiral nozzle via a reducing internal thread connector. An oil return port is provided on the side wall of the tank. On the side wall of the tank perpendicular to the oil return port, there are a high level switch, a medium level switch, and a low level switch. A Pall ring is also provided inside the tank.

[0016] Preferably, the fine filtration system includes a fine filtration tank, in which a filter element is provided; pressure sensors are provided on both the front and rear sides of the fine filtration tank; a precision filter pneumatic valve is provided on the front side of the fine filtration tank; a precision filter oil pump is provided between the fine filtration tank and the dehydration tank; and a pressure pump is also provided between the fine filtration tank and the circulation tank.

[0017] Preferably, a vacuum pipeline pneumatic valve and a vacuum pump are also provided between the circulation tank and the dehydration system.

[0018] Preferably, a residue tank with a liquid level sensor is also provided on one side of the centrifuge.

[0019] Preferably, a clean oil tank is connected downstream of the fine filter tank via a pipeline, and an electromagnetic pneumatic valve and a backwash pump are also provided between the fine filter tank and the clean oil tank. The fine filter tank is connected to the circulation tank via a pipeline, and a pressure pump is also provided on the pipeline.

[0020] Preferably, it also includes a refueling tank for storing waste oil, the refueling tank being connected to the primary heating system via an oil pipeline, the refueling tank being equipped with a coarse filter screen that can intercept large particles or impurities; the refueling tank is equipped with a liquid level sensor, and when the liquid level reaches the target level and triggers the liquid level sensor, the refueling tank supplies oil to the primary heating system.

[0021] The beneficial effects of this invention are as follows: This invention uses a primary heating system and a secondary heating system to heat and circulate the waste oil, and through the coordinated operation of a centrifugal system, a dehydration system, and a fine filtration system, it achieves the filtration, recovery, and self-cleaning of the waste oil. This improves work efficiency and enhances the quality of waste oil recovery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the working principle of this utility model;

[0023] Figure 2A schematic diagram of the centrifugal mechanism and the automatic slag discharge mechanism;

[0024] Figure 3 This is a schematic diagram of the filter element structure;

[0025] Figure 4 This is a schematic diagram of the dehydration tank.

[0026] The diagram shows: 1. Fuel tank; 2. Primary heating system; 3. Secondary heating system; 4. Centrifugal system.

[0027] 5. Dehydration system; 6. Fine filtration system; 7. Vacuum pipeline pneumatic valve; 8. Vacuum pump; 9. Sludge tank; 10. Clean oil tank; 11. Electromagnetic pneumatic valve; 12. Backwash pump;

[0028] 21. Mixing tank; 22. Circulating oil pump; 23. First heater; 24. Temperature sensor; 25. Liquid level sensor;

[0029] 26. Pressure sensor; 27. Electromagnetic pneumatic valve;

[0030] 31. Circulating tank; 32. Circulating oil pump; 33. Second heater; 34. Temperature sensor; 35. Liquid level sensor;

[0031] 36. Electromagnetic vent valve; 37. Oil inlet pneumatic valve;

[0032] 41. Centrifuge mechanism; 411. Centrifuge base; 412. Rotary drum; 413. Rotary drum bearing housing; 414. Rotary drum shaft;

[0033] 415. Drum synchronizer pulley; 416. Support frame; 417. Drum servo motor; 418. Drum servo motor synchronizer pulley;

[0034] 419. Belt; 410. Pin hole;

[0035] 42. Automatic slag discharge mechanism; 421. Slag discharge reduction motor; 422. Drive shaft; 423. Opening and closing cylinder; 424. Upper shift fork; 425. High-speed bearing; 426. Scraper shaft; 427. Lower shift fork; 428. Rotary scraper; 429. Locking cylinder;

[0036] 420. Locking pin;

[0037] 51. Intermediate tank; 52. Dehydration tank; 53. Dehydration oil supply pump; 54. Cooling fan; 521. Tank body;

[0038] 522. Sheet metal insulation layer; 523. Insulation cotton; 524. Oil inlet; 525. Vacuum inlet; 526. Drain pipe;

[0039] 527. Vent valve; 528. Instrument interface; 529. Oil outlet; 530. Reducer; 531. Reducer internal threaded connector;

[0040] 532. Spiral nozzle; 533. Oil return port; 534. High level switch; 535. Medium level switch; 536. Low level switch; 537. Pall ring; 538. Solenoid air inlet valve;

[0041] 61. Fine filter tank; 62. Filter element; 63. Pressure sensor; 64. Precision filter pneumatic valve; 65. Precision filter oil pump; 66. Pressure pump. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0043] like Figure 1-4 As shown: The sealing oil purification system includes a refueling tank 1, and further includes a primary heating system 2, a secondary heating system 3, a centrifugal system 4, a dehydration system 5, and a fine filtration system 6, which are sequentially arranged downstream of the refueling tank 1.

[0044] The secondary heating system 3 is circulated and connected to the centrifugation system 4, the dehydration system 5, and the fine filtration system 6.

[0045] The primary heating system 2 includes a mixing tank 21, which is equipped with a circulating oil pump 22 and a first heater 23, as well as a temperature sensor 24, a liquid level sensor 25, and a pressure sensor 26. An electromagnetic pneumatic valve 27 is also provided between the oil tank 1 and the mixing tank 21.

[0046] The secondary heating system 3 includes a circulation tank 31, which is equipped with a circulation oil pump 32 and a second heater 33, as well as a temperature sensor 34, a liquid level sensor 35, and an electromagnetic venting valve 36. An oil inlet pneumatic valve 37 is also provided between the circulation tank 31 and the stirring tank 21.

[0047] The centrifugal system 4 includes a centrifugal mechanism 41 and an automatic slag discharge mechanism 42.

[0048] The centrifugation mechanism 41 includes a centrifuge base 411, a drum 412 below the centrifuge base 411, a drum bearing chamber 413 above the drum base 411, a drum shaft 414 fitted inside the drum bearing chamber 413, the lower end of the drum shaft 414 connected to the drum 412, the upper end extending upward and out of the drum bearing chamber 413, a drum synchronous pulley 415 fitted at the top of the drum bearing chamber 413, a support frame 416 provided outside the drum bearing chamber 413, a drum servo motor 417 provided on the support frame 416, a drum servo motor synchronous pulley 418 provided on the output shaft of the drum servo motor 417, and the drum synchronous pulley 415 and the drum servo motor synchronous pulley 418 connected by a belt 419.

[0049] The automatic slag discharge mechanism 42 includes a slag discharge reduction motor 421, which is equipped with a transmission shaft 422. The upper end of the transmission shaft 422 is equipped with an opening and closing cylinder 423, and the lower end is equipped with an upper fork 424. The drum shaft 414 is hollow and has a high-speed bearing 425 inside. A scraper shaft 426 is equipped inside the high-speed bearing 425. The upper end of the scraper shaft 426 is equipped with the upper fork 424 through a lower fork 427, and the lower end extends into the drum 412. A rotating scraper 428 is provided inside the drum 412 and at the lower end of the scraper shaft 426.

[0050] On the centrifuge base 411, on one side of the drum bearing chamber 413, a locking cylinder 429 is also provided. The piston rod of the locking cylinder 429 is provided with a locking pin 420 at its end. The top of the drum 412 is provided with a pin hole 410. The locking pin 420 can be inserted into the pin hole 410 and lock the drum 412.

[0051] The slag discharge reduction motor 421 provides power and drives the rotating scraper 428 to rotate through the transmission shaft 422; the locking cylinder 429 drives the locking pin 420 to move linearly. When the locking pin 420 extends, it inserts into the pin hole 410 and locks the drum 412, preventing the drum 412 from moving with the rotating scraper 428.

[0052] When centrifugation is in progress, the locking cylinder 429 opens, and the rotating scraper 428 rotates with the drum 412, allowing purified oil to seep out of the drum 412, while solid impurities adhere to the inner wall of the drum 412. When centrifugation is finished, the locking cylinder 429 locks, and only the rotating scraper 428 rotates, scraping off the solid impurities adhering to the inner wall of the drum 412.

[0053] The dehydration system 5 includes an intermediate box 51 and a dehydration tank 52. A dehydration oil supply pump 53 is provided between the intermediate box 51 and the dehydration tank 52. A cooling fan 54 is provided above the dehydration tank 52.

[0054] The dehydration tank 52 includes a tank body 521, with an insulation layer of sheet metal 522 on the outside of the tank body 521, and insulation cotton 523 between the tank body 521 and the insulation layer of sheet metal 522; the top of the tank body 521 is provided with an oil inlet 524 and a vacuum port 525 that are perpendicular to each other, and the bottom is provided with a drain pipe 526; on the tank body 521, below the oil inlet 524 and the vacuum port 525, a vent valve 527 and an instrument interface 528 are also provided; and on the tank body 521, above the drain pipe 526, an oil outlet 529 is provided.

[0055] Inside the tank body 521, connected to the oil inlet 524, there is a reducing pipe 530. The lower end of the reducing pipe 530 is connected to a spiral nozzle 532 through a reducing internal threaded connector 531. An oil return port 533 is provided on the side wall of the tank body 521. On the side wall of the tank body 521 perpendicular to the oil return port 533, there are a high level switch 534, a medium level switch 535, and a low level switch 536. A Pall ring 537 is also provided inside the tank body 521.

[0056] Tank 521 is used to hold and keep the oil warm. The oil inlet 524 is connected to the dehydration oil supply pump 53, which injects the oil in the intermediate tank 55 into the dehydration tank 52 through the oil inlet 524. The vacuum port 525 is connected to the vacuum pump 8 to provide a negative pressure environment for the dehydration tank 52, which is conducive to low-temperature flash evaporation. The oil outlet 529 is connected to the precision filter oil pump 65. After flash evaporation, the oil is discharged into the fine filter tank 61 by the precision filter oil pump 65. The oil return port 533 is connected to the safety valve of the fine filter tank. This safety valve is an overflow valve. When the pressure increases, this valve opens to protect the filter element and at the same time discharges the oil in the fine filter tank 61 back into the dehydration tank 52. The drain pipe 526 is connected to the manual ball valve. After the dehydration tank 52 has been running for a period of time, there will be unfiltered solid dirt sediment. It can be cleaned periodically by the manual ball valve.

[0057] The fine filtration system 6 includes a fine filtration tank 61, a filter element 62 is provided inside the fine filtration tank 61; pressure sensors 63 are provided on both the front and rear sides of the fine filtration tank 61; a precision filter pneumatic valve 64 is provided on the front side of the fine filtration tank 61; a precision filter oil pump 65 is provided between the fine filtration tank 61 and the dehydration tank 52; and a pressure pump 66 is also provided between the fine filtration tank 61 and the circulation tank 31.

[0058] A vacuum pipeline pneumatic valve 7 and a vacuum pump 8 are also provided between the circulation tank 31 and the dehydration system 5.

[0059] A residue tank 9 with a liquid level sensor is also provided on one side of the centrifuge mechanism 41.

[0060] Downstream of the fine filter tank, a clean oil tank 10 is connected via a pipeline. An electromagnetic pneumatic valve 11 and a backwash pump 12 are also provided between the fine filter tank and the clean oil tank 10.

[0061] The sealing oil purification system includes the following purification methods:

[0062] S1: Add the sludge oil to the refueling tank 1. A coarse filter screen is installed at the oil inlet of the refueling tank 1 to intercept large particles or impurities. A high-level sensor and a low-level sensor are installed in the refueling tank 1. When the liquid level reaches the target, the high-level sensor is triggered, and the circulating oil pump 22 starts to replenish the oil in the refueling tank 1 to the mixing tank 21. The mixing tank 21 is equipped with a high-level sensor and a low-level sensor to replenish oil when the liquid level is low and stop when the liquid level is high.

[0063] S2: During the process of the circulating oil pump 22 replenishing oil from the oil tank 1 to the mixing tank 21, the first heater 23 starts heating when the temperature is lower than the set low temperature under the control of the temperature sensor 24, and stops heating when the temperature reaches the set high temperature.

[0064] S3: When the circulating tank 31 is at a low liquid level, open the inlet pneumatic valve 37, start the vacuum pump 8, open the circulating tank vacuum pipeline pneumatic valve 7, and close the circulating tank solenoid vent valve 36. When the preheated oil from the stirring tank 21 is added to the circulating tank 31 through negative pressure to a high liquid level, close the inlet pneumatic valve 37 to cut off the oil source, and at the same time close the vacuum pipeline pneumatic valve 7 and open the solenoid vent valve 36.

[0065] S4: When the temperature of the circulating tank 31 is lower than the set temperature, the second heater 33 is started to heat the tank to the set temperature through self-circulation. When the set temperature is reached, the pneumatic valve 37 at the oil inlet is closed and the centrifugal mechanism 41 is started.

[0066] S5: The circulating oil pump 32 delivers oil to the centrifugal mechanism 41. The centrifugal mechanism 41 sets the running time, centrifugal speed and automatic slag scraping time according to the oil process. The oil within the centrifugation time enters the intermediate tank 51 and then enters the circulating tank 32 to achieve circulating centrifugation degumming and impurity removal. The centrifugation and automatic slag discharge work are automatically completed according to the set parameters. The discharged oil slag enters the slag frame of the slag oil tank for oil draining and is then collected manually.

[0067] S6: The residual oil tank 9 is set with high and low liquid levels. When the residual oil level triggers the low liquid level, the oil pump is started to transport the residual oil in the intermediate tank 51 to the circulating tank 31. When the high liquid level is triggered, the centrifugal mechanism stops. The centrifugal mechanism is started again when the residual oil level reaches the low liquid level.

[0068] S7: Flash dehydration, vacuum dehydration. Set the temperature, vacuum pressure, high and low liquid levels and dehydration time. After centrifugation, enter the dehydration process. Centrifugation mechanism 41 and circulating oil pump 32 operate normally. The dehydration temperature is set to 60 degrees Celsius and the dehydration time is delayed by 2 minutes.

[0069] S8: If the set dehydration temperature is not reached, the oil circulated to the set temperature by automatic heating and centrifugation is then transported to the intermediate tank 51 via the circulating oil pump 22. Then, the flash dehydration oil supply pump 53 is started to transport the oil from the intermediate tank 51 to the flash dehydration tank 52 for dehydration. Simultaneously, the vacuum pump 8 and cooling fan 54 are started, and the electromagnetic air inlet valve 538 is closed.

[0070] S9: When the oil level reaches a high level, the flash dehydration oil supply pump 53 stops supplying oil. After a 2-minute delay, the vacuum pump 8 and cooling fan 54 are turned off, and the electromagnetic air inlet valve 538 is opened. Flash dehydration is then complete.

[0071] S10: End-of-line precision filtration. The precision filter is equipped with a front pressure sensor 63, a rear pressure sensor 63, and a clean oil tank level sensor. The oil from the flash dehydration tank 52 is transported to the precision filter by the precision filter oil pump 65. The filter element 62 in the filter intercepts impurities in the oil to the surface of the filter element 62. The oil is discharged into the clean oil tank 10 through the oil outlet 529 through the filter element 52.

[0072] S11: Backwash Self-Cleaning: When the pressure of the pressure sensor 63 before the filter is higher than the set value, the precision filter pneumatic valve 64 will be switched and the backwash pump 12 will be started to use the oil in the clean oil tank 10 for backwashing. The backwash oil and impurities are transported to the circulation tank 31 by the pipeline under pressure. When the pressure sensor 63 of the precision filter is lower than the set value during the backwashing process, the backwash pump 12 will be stopped after a delay of 1 minute. After the backwashing work is completed, the precision filter pneumatic valve 64 will be automatically switched to the filtration state.

[0073] The working principle and process of this utility model are as follows:

[0074] (1) Sludge oil filling: Sludge oil needs to be added when the liquid level of the refueling tank 1 is low. The filling method can be automatic delivery through pipeline or manual filling. Sludge oil needs to be added when the high liquid level sensor of the mixing tank 21 is not triggered. The filling method is to transfer oil from the refueling tank 1 to the mixing tank 21 through the oil pump. At the same time, the first heater 23 and the stirring motor are started. When the high liquid level sensor is triggered, the valve is switched to control the refueling work to stop. When the mixing tank 21 is heated to the set temperature of 75 degrees, the heater stops to ensure sufficient low temperature treatment. The circulating oil pump 22 stops, waiting for the subsequent refueling work of the circulating tank 31.

[0075] The control process is achieved by the electromagnetic pneumatic valve 27 linking multiple electrical components such as temperature, liquid level and pressure sensors to realize automatic switching control, that is: when the liquid level of the refueling tank 1 is low, no refueling is added, and the stirring tank 21 starts to run in a self-heating cycle between the low liquid level trigger and the high liquid level. When the liquid level is lower than the low liquid level, heating and circulation stop.

[0076] (2) Sludge and oil circulation and centrifugation: When the circulation tank 31 is at a low level, the low level sensor 25 is triggered to open the inlet pneumatic valve 37, start the vacuum pump 8, open the vacuum pipeline pneumatic valve 7 of the circulation tank, and close the electromagnetic vent valve 36 of the circulation tank. When the preheated oil in the stirring tank 21 is added to the circulation tank 31 through negative pressure to a high level, the inlet pneumatic valve 37 is closed to cut off the oil source, and the vacuum pipeline pneumatic valve 7 is closed and the electromagnetic vent valve 36 is opened. When the circulation tank 31 does not need to be refilled and the dehydration tank 52 does not need to be dehydrated, the vacuum pump 8 stops.

[0077] When the temperature of the circulating tank 31 is lower than the set temperature, the second heater 33 is started to heat the oil to the set temperature through self-circulation. When the set temperature is reached, the pneumatic valve 37 at the oil inlet automatically switches the oil pipeline of the circulating tank 31 to centrifugal operation. The circulating oil pump 32 delivers oil to the centrifugal mechanism 41. The centrifugal operation is set according to the oil process settings for running time, centrifugal speed and automatic slag scraping time. The oil within the centrifugal time enters the intermediate tank 51 and then enters the circulating tank 31 to achieve circulating centrifugal degumming and impurity removal. The centrifugation and automatic slag discharge are automatically completed according to the set parameters. The discharged oil slag enters the slag frame of the slag oil tank 9 for oil draining and is then collected manually.

[0078] The residual oil tank 9 is equipped with a high level sensor and a low level sensor. When the residual oil level triggers the low level sensor, the oil pump is started to transport the residual oil in the intermediate tank 51 to the circulating tank 31. When the high level sensor is triggered, the centrifugal operation stops. When the residual oil level reaches the low level, the centrifugal mechanism 41 is started again. When the circulating tank 31 needs to be refilled, residual oil is pumped first for oil replenishment.

[0079] (3) Flash dehydration: Vacuum dehydration is set with temperature, vacuum pressure, high and low liquid levels, and dehydration time. After centrifugation, the dehydration process begins. Centrifuge mechanism 41 and circulating oil pump 22 operate normally. The dehydration temperature is set to 60 degrees Celsius, and the dehydration time is delayed by 2 minutes. If the dehydration temperature is not reached, the oil circulated to the set temperature by centrifugation is automatically heated and transported to intermediate tank 51 through circulating oil pump 22. Then, flash dehydration oil supply pump 53 is started to transport the oil from intermediate tank 51 to flash dehydration tank 52 for dehydration. At the same time, vacuum pump 8 and cooling fan 54 are started, and electromagnetic air inlet valve 538 is closed. Electromagnetic air inlet valve 538 is a normally open electromagnetic valve, which is independently installed on the top of dehydration tank 52. When dehydration is not in progress, electromagnetic air inlet valve 538 is in an open state and connected to the atmosphere. At this time, fine filtration can be performed. If dehydration tank 52 is under negative pressure or closed, fine filtration oil pump 65 cannot extract the oil from the tank. When dehydration is required, the electromagnetic air inlet valve 538 is closed, and the dehydration tank 52 is placed under negative pressure by the vacuum pump 8, which can complete the low-temperature flash evaporation operation. When the oil triggers the high liquid level sensor, the flash evaporation dehydration oil supply pump 53 stops supplying oil, and after a 2-minute delay, the vacuum pump 8 and cooling fan 54 are turned off, and the electromagnetic air inlet valve 538 is opened, completing the flash evaporation dehydration operation.

[0080] Besides flash evaporation dehydration technology, there are also dehydration methods using dehydration filter cartridges and membrane equipment. Filter cartridge dehydration requires filter media, while membrane equipment is expensive and prone to clogging. Compared to these technologies, flash evaporation dehydration consumes no filter media, requires less cost, and is highly efficient. Flash evaporation technology utilizes the close relationship between water's boiling point and atmospheric pressure; the lower the pressure, the lower the boiling point. A vacuum pump provides a negative pressure environment, causing water mixed in sealing oil to begin boiling at around 50°C. This causes a physical change, turning water vapor into steam, which is then carried through a vacuum pipe into a cooler. After cooling back to water, the vapor enters a gas-liquid separator.

[0081] (4) End-of-line precision filtration: The precision filter is equipped with a front pressure sensor 63, a rear pressure sensor and a clean oil tank level sensor; the oil in the flash dehydration tank 52 is transported to the precision filter by the precision filter oil pump 65. The filter element 62 in the filter intercepts the impurities in the oil to the surface of the filter element 62. The oil is discharged into the clean oil tank 10 through the oil outlet 529 through the filter element 62.

[0082] (5) Backwash self-cleaning: When the pressure of the pressure sensor 63 before the precision filter is higher than the set value, the pneumatic valve will be switched to start the backwash pump 12, which uses the oil in the clean oil tank 10 for backwashing. The backwash oil and impurities are transported to the circulation tank 31 through the pipeline via the pressure pump 66. When the pressure sensor 63 of the precision filter is lower than the set value during the backwashing process, the backwash pump 12 will be stopped after a delay of 1 minute. After the backwashing work is completed, the pneumatic valve 64 of the precision filter will be automatically switched to the filtration state.

Claims

1. A sealing oil purification system, characterized in that: The system comprises a primary heating system, a secondary heating system, a centrifugal system for removing impurities, a dehydration system for removing moisture from sludge, and a fine filtration system. The oil inlet of the primary heating system is connected to the oil pipeline for transporting sludge, and the primary heating system heats the sludge to a preset temperature. The oil outlet of the primary heating system is connected to the oil inlet of the secondary heating system, and the secondary heating system stores the sludge and provides supplemental heating to maintain the oil temperature at the preset temperature. The oil outlet of the secondary heating system is connected to the oil inlet of the centrifugal system, the oil outlet of the centrifugal system is connected to the oil inlet of the dehydration system, and the oil outlet of the dehydration system is connected to the oil inlet of the fine filtration system to transport the sludge into the fine filtration system for physical filtration.

2. The sealing oil purification system according to claim 1, characterized in that: The primary heating system includes a mixing tank, a circulating oil pump, and a first heater. The mixing tank is equipped with a temperature sensor, a liquid level sensor, and a pressure sensor. An electromagnetic pneumatic valve is also provided between the oil tank and the mixing tank. The first heater is a pipeline heater located outside the mixing tank. The oil inlet and oil outlet of the first heater are respectively connected to the mixing tank. The circulating oil pump is used to drive the sludge oil in the mixing tank to circulate into the first heater for heating.

3. The sealing oil purification system according to claim 1, characterized in that: The secondary heating system includes a circulation tank, a circulation oil pump, and a second heater. The circulation tank is equipped with a temperature sensor, a liquid level sensor, and an electromagnetic vent valve. An oil inlet pneumatic valve is also provided between the circulation tank and the mixing tank. The second heater is a pipeline heater located outside the circulation tank. The oil inlet and outlet of the second heater are respectively connected to the circulation tank. The circulation oil pump is used to drive the sludge oil in the circulation tank to circulate into the second heater for heating.

4. The sealing oil purification system according to claim 1, characterized in that: The centrifugal system includes a centrifugal mechanism and an automatic slag discharge mechanism; The centrifugation mechanism includes a centrifuge base, a drum below the centrifuge base, a drum bearing chamber above the drum base, a drum shaft fitted inside the drum bearing chamber, the lower end of the drum shaft connected to the drum, the upper end extending upward and out of the drum bearing chamber, a drum synchronous pulley fitted at the top of the drum bearing chamber, a support frame outside the drum bearing chamber, a drum servo motor mounted on the support frame, a drum servo motor synchronous pulley mounted on the output shaft of the drum servo motor, and the drum synchronous pulley connected to the drum servo motor synchronous pulley via a belt. The automatic slag discharge mechanism includes a slag discharge reduction motor, which is equipped with a drive shaft. The upper end of the drive shaft is equipped with an opening and closing cylinder, and the lower end is equipped with an upper shift fork. The drum shaft is hollow and has a high-speed bearing inside. A scraper shaft is equipped inside the high-speed bearing. The upper end of the scraper shaft is equipped with the upper shift fork via a lower shift fork, and the lower end extends into the drum. A rotating scraper is provided inside the drum and at the lower end of the scraper shaft. A locking cylinder is also provided on the centrifuge base and on one side of the drum bearing chamber. The piston rod of the locking cylinder is provided with a locking pin at its end, and the top of the drum is provided with a pin hole. The locking pin can be inserted into the pin hole to lock the drum.

5. The sealing oil purification system according to claim 1, characterized in that: The dehydration system includes an intermediate tank and a flash dehydration device. The flash dehydration device includes a dehydration tank. A dehydration oil supply pump is provided between the intermediate tank and the dehydration tank. A cooling fan is provided above the dehydration tank. The dehydration tank includes a tank body, an insulating sheet metal layer on the outside of the tank body, and insulating cotton between the tank body and the insulating sheet metal layer; the top of the tank body has a vertically perpendicular oil inlet and a vacuum port, the bottom has a drain pipe, a vent valve and an instrument interface are provided on the tank body below the oil inlet and the vacuum port, and an oil outlet is provided on the tank body above the drain pipe; Inside the tank, connected to the oil inlet, is a reducing pipe. The lower end of the reducing pipe is connected to a spiral nozzle via a reducing internal thread connector. An oil return port is provided on the side wall of the tank. On the side wall of the tank perpendicular to the oil return port, there are a high level switch, a medium level switch, and a low level switch. A Pall ring is also provided inside the tank.

6. The sealing oil purification system according to claim 1, characterized in that: The fine filtration system includes a fine filtration tank, in which a filter element is installed; pressure sensors are installed on both the front and rear sides of the fine filtration tank; a precision filter pneumatic valve is installed on the front side of the fine filtration tank; a precision filter oil pump is installed between the fine filtration tank and the dehydration tank; and a pressure pump is installed between the fine filtration tank and the circulation tank.

7. The sealing oil purification system according to claim 3, characterized in that: A vacuum pipeline pneumatic valve and a vacuum pump are also provided between the circulation tank and the dehydration system.

8. The sealing oil purification system according to claim 4, characterized in that: A residue tank with a liquid level sensor is also provided on one side of the centrifuge.

9. The sealing oil purification system according to claim 6, characterized in that: Downstream of the fine filter tank is a clean oil tank connected by a pipeline. An electromagnetic pneumatic valve and a backwash pump are also provided between the fine filter tank and the clean oil tank. The fine filter tank is connected to the circulation tank by a pipeline, and a pressure pump is also provided on the pipeline.

10. The sealing oil purification system according to claim 1, characterized in that: It also includes a refueling tank for storing waste oil, which is connected to the primary heating system via an oil pipeline. The refueling tank is equipped with a coarse filter screen that can intercept large particles or impurities. A liquid level sensor is installed in the refueling tank. When the liquid level reaches the target level and triggers the liquid level sensor, the refueling tank supplies oil to the primary heating system.

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