Environment-friendly waste lubricating oil solid removal and purification equipment and process

Abstract

The invention relates to the technical field of purification and separation, and discloses environment-friendly waste lubricating oil solid removal and purification equipment which comprises a tank body, the inorganic membrane assembly is used for purifying and separating waste gas lubricating oil; the downstream part is used for receiving the lubricating oil purified and separated by the inorganic membrane assembly; the top of the tank body is connected with an oil discharge pipe, the bottom of the tank body is connected with an oil inlet pipe, one end of the oil inlet pipe is connected with an external circulating pump, and the inorganic membrane assembly is connected with a downstream part through a pipeline. According to the environment-friendly waste lubricating oil solid removal and purification equipment, waste lubricating oil can be pressurized to be subjected to osmotic filtration from the membrane assembly through the arranged inorganic membrane assembly according to oil liquid pressure provided by the circulating pump, and the permeation area of oil liquid can be effectively increased by utilizing an inorganic membrane of a spiral structure; therefore, the separation efficiency of solid impurities in oil is improved, and meanwhile, the whole equipment is low in investment cost, high in overall separation effect and easy and convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of purification separation technology, in particular to an environment-friendly waste lubricating oil desolidification and purification equipment and process. BACKGROUND

[0002] With the development of lubricating oil regeneration towards large-scale and non-secondary pollution regeneration technology, it is particularly crucial to develop a strong adaptive pretreatment technology. Backwashing filtration technology is one of the commonly used methods for treating solid-liquid analysis. Filtration is one of the most common and effective unit operations for separating suspensions, which can obtain pure liquid or solid products. Filtration operation can make the separation of suspensions more rapid, more thorough, and lower in energy consumption.

[0003] At present, solid-liquid separation can be roughly achieved by sedimentation, filtration, electrostatic separation and centrifugal separation. Gravity sedimentation and centrifugal separation are the original traditional liquid-solid separation methods, which have the problems of poor separation effect, small treatment capacity and large equipment investment. The gravity sedimentation needs a large number of storage tanks, which increases the equipment and operation cost. Although the addition of a sedimentation aid can improve the sedimentation efficiency, the addition of the aid will increase the cleaning and subsequent separation cost. Therefore, the above two separation methods are not suitable for large-scale industrial application and are currently commonly used in laboratory liquid-solid separation processes. Although electrostatic separation has good separation effect, it has the problems of complex equipment operation, high investment, high operation and maintenance cost, and poor adaptability and stability. Therefore, an environment-friendly waste lubricating oil desolidification and purification equipment and process are proposed to solve the above problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an environment-friendly waste lubricating oil desolidification and purification equipment and process, which solves the problems of poor effect, complex equipment operation, high investment, high operation and maintenance cost, and poor adaptability and stability in the prior art when purifying and separating some waste lubricating oil.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an environment-friendly waste lubricating oil desolidification and purification equipment, comprising a tank body; an inorganic membrane assembly for purifying and separating waste lubricating oil; a downstream component for receiving lubricating oil after purification and separation by the inorganic membrane assembly; an oil discharge pipe connected to the top of the tank body, an oil inlet pipe connected to the bottom of the tank body, one end of the oil inlet pipe connected to an external circulating pump, and the inorganic membrane assembly connected to the downstream component through a pipeline; the inorganic membrane assembly comprises an inorganic membrane, an internal permeation cavity of the inorganic membrane, a communication pipe communicated in the permeation cavity, and the inorganic membrane arranged in the interior of the tank body.

[0006] Preferably, the bottom of the communication pipe is communicated with an oil outlet pipe, the right end of the oil outlet pipe is communicated with the downstream component, and the inorganic membrane has a spiral structure.

[0007] Preferably, the backflushing assembly further comprises an outlet piece, the outlet piece comprises a pressure sheet, the pressure sheet is located above the inorganic membrane, a display rod is connected to the pressure sheet through a connecting rod, the display rod is slidingly connected to the top of the tank body, a sliding plate is connected to the display rod, a pressure spring is connected to the sliding plate, the top of the pressure spring abuts against the tank body, a sliding sleeve is fixedly connected to the pressure sheet, an opening is formed in the surface of the sliding sleeve, a drainage pipe is formed in the inside of the tank body and comprises a drainage opening, and the concentrated liquid filtered by the inorganic membrane will enter the inside of the drainage pipe from the position of the drainage opening.

[0008] Preferably, the backflushing assembly further comprises an outlet piece, the outlet piece comprises a pressure sheet, the pressure sheet is located above the inorganic membrane, a display rod is connected to the pressure sheet through a connecting rod, the display rod is slidingly connected to the top of the tank body, a sliding plate is connected to the display rod, a pressure spring is connected to the sliding plate, the top of the pressure spring abuts against the tank body, a sliding sleeve is fixedly connected to the pressure sheet, an opening is formed in the surface of the sliding sleeve, a drainage pipe is formed in the inside of the tank body and comprises a drainage opening, and the concentrated liquid filtered by the inorganic membrane will enter the inside of the drainage pipe from the position of the drainage opening.

[0009] Preferably, the backflushing assembly further comprises a pollution collecting piece, the pollution collecting piece comprises a baffle, the baffle is fixed to the bottom of the tank body, a pollution collecting cavity is formed between the baffle and the tank body, a spiral plate is arranged in the inside of the pollution collecting cavity, a pollution discharge pipe is connected to the tank body and communicates with the pollution collecting cavity.

[0010] Preferably, a spacer sleeve is slidingly connected to the inside of the tank body, a guide plate is slidingly connected to the inside of the spacer sleeve, the guide plate is fixed to the surface of the hollow tube, and the spacer sleeve is connected to the penetrating sleeve through a connecting rod.

[0011] Preferably, the backflushing assembly further comprises a reversing piece, the reversing piece comprises a reversing sleeve, the inside of the reversing sleeve is in a hollow structure, a reversing opening is formed in the inside of the reversing sleeve, the reversing sleeve is slidingly connected to the surface of the hollow tube, an extension rod is connected to the top of the reversing sleeve, the top of the extension rod is connected to the pressure sheet, the cavity in the reversing sleeve communicates with the inside of the extension rod, a plurality of conduits are formed in the surface of the extension rod, a partition plate is connected to the bottom of the pressure sheet, and a plurality of through holes are formed in the partition plate.

[0012] Preferably, the backflushing assembly further comprises a damping piece, the damping piece comprises a support rod, the bottom of the support rod is connected to the sliding plate, a spherical body is connected to the top of the support rod, a damping cavity is formed in the top of the tank body, damping liquid is arranged in the inside of the damping cavity, the spherical body is located in the damping liquid, and the support rod is slidingly connected to the damping cavity.

[0013] Another object of the present application is to provide an environment-friendly waste lubricating oil de-solidification and purification process, which comprises the following steps: Step 1: Initial pressurization. The waste lubricating oil is pressurized using an external circulating pump and injected into the tank. Step 2: Membrane filtration. After being pressurized, the oil will pass through the inorganic membrane module, where the oil will be separated by membrane filtration using the inorganic membrane. Step 3: Drainage. The permeated oil after membrane filtration enters the interior of the downstream component through the pipeline, while the concentrated oil that has not been permeated will enter the interior of the drain pipe through the pipeline and be discharged outward. Step 4: Backflushing operation. When the pressure injected by the circulating pump remains constant, the internal pressure of the tank reaches a certain value, which means that there are many deposits on the surface of the inorganic membrane, affecting the filtration and separation efficiency. Then the oil injected by the oil inlet pipe will be reversed, changing from bottom to top to top to backflushing the surface of the inorganic membrane. The flushed oil and impurities will be discharged autonomously from the drain pipe. Step 5: Gravity damping reset. After the backflush is completed, the commutator will automatically sink and reset under its own gravity, and return to the "membrane filtration separation state".

[0014] Compared with the prior art, the present invention provides an environmentally friendly waste lubricating oil desolidification and purification equipment and process, which has the following beneficial effects: 1. This environmentally friendly waste lubricating oil desolidification and purification equipment, through the inorganic membrane module, can pressurize the waste lubricating oil through the membrane module for permeation filtration based on the oil pressure provided by the circulating pump. Furthermore, by utilizing the spiral structure of the inorganic membrane, the permeation area of ​​the oil can be effectively increased, thereby improving the separation efficiency of solid impurities in the oil. At the same time, the overall equipment has a low investment cost, high overall separation effect, and is easy to operate.

[0015] 2. This environmentally friendly waste lubricating oil desolidification and purification equipment, through its backwashing component, can achieve long-term filtration of the inorganic membrane and then backwash the impurities attached to the surface, maintaining the permeability of the inorganic membrane and avoiding surface blockage and reduced permeability. The entire process relies on changes in the oil delivery pressure to achieve autonomous switching, eliminating the need for manual cleaning or disassembly of the equipment by operators, further improving the operator's control over the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention; Figure 3 This is a schematic diagram of the inorganic membrane module structure of an environmentally friendly waste lubricating oil desolidification and purification equipment proposed in this invention; Figure 4This is a schematic diagram of the hollow tube structure of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention. Figure 5 This is a schematic diagram of the pressure plate connection structure of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention; Figure 6 This is a schematic diagram of the outlet location of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention; Figure 7 This is a schematic diagram of the connection position structure of the spiral blades in an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention. Figure 8 This is a schematic diagram of the damping component structure of an environmentally friendly waste lubricating oil desolidification and purification device proposed in this invention.

[0017] In the diagram: 1. Tank; 2. Oil drain pipe; 3. Oil inlet pipe; 4. Sewage drain pipe; 5. Downstream component; 6. Inorganic membrane module; 601. Inorganic membrane; 602. Connecting pipe; 603. Oil outlet pipe; 604. Permeation chamber; 7. Backflushing assembly; 701. Hollow tube; 702. Penetration sleeve; 703. Liquid outlet; 704. Guide plate; 705. Sept; 706. Sludge collection component; 7061. Sludge collection component 7062. Cavity; 7063. Baffle; 7064. Spiral blade; 707. Pressure plate; 708. Sliding sleeve; 709. Opening; 710. Drainage port; 711. Display rod; 712. Pressure spring; 713. Slide plate; 714. Extension rod; 715. Reversing sleeve; 716. Reversing port; 717. Conduit; 718. Partition; 719. Damping cavity; 720. Support rod; 721. Sphere. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-8 An environmentally friendly waste lubricating oil desolidification and purification device includes a tank 1; an inorganic membrane module 6 for purifying and separating waste lubricating oil; and a downstream component 5 for receiving the lubricating oil purified and separated by the inorganic membrane module 6. The top of the tank 1 is connected to an oil drain pipe 2, and the bottom of the tank 1 is connected to an oil inlet pipe 3. One end of the oil inlet pipe 3 is connected to an external circulation pump, and the inorganic membrane module 6 is connected to the downstream component 5 through a pipeline. The inorganic membrane module 6 includes an inorganic membrane 601, with a permeation chamber 604 inside the membrane 601. A connecting pipe 602 is connected to the permeation chamber 604. The inorganic membrane 601 is disposed inside the tank 1. This membrane is made of high-temperature resistant and corrosion-resistant inorganic material, possessing excellent mechanical strength and chemical stability, making it suitable for complex working environments such as waste lubricating oil. The inorganic membrane 601 has a permeation chamber 604 inside, which extends axially along the membrane and is used to collect the clean oil after permeation separation through the membrane wall. The permeation chamber 604 is connected to a connecting pipe 602 through its top or side wall. This connecting pipe 602 serves as a collection and guiding channel for the permeate, ensuring the smooth discharge of the separated oil. An oil outlet pipe 603 is connected to the bottom of the connecting pipe 602, and the right end of the oil outlet pipe 603 is connected to the downstream component 5. The inorganic membrane 601 has a spiral structure. The bottom of the connecting pipe 602 is connected to an oil outlet pipe 603, the right end of which is connected to the downstream component 5, thereby conveying the purified lubricating oil to the subsequent processing unit or storage device. The inorganic membrane 601 adopts a unique spiral structure arrangement. This design not only significantly increases the effective filtration area and improves the processing capacity per unit volume, but also guides the oil to form a uniform tangential flow on the membrane surface through the spiral flow channel, effectively reducing the deposition of solid particles on the membrane surface and concentration polarization, thus significantly improving filtration efficiency and membrane lifespan. The spiral structure also facilitates a longer filtration path within a limited space, enhancing the separation effect and making the equipment structure more compact.

[0020] In this embodiment, a backflushing assembly 7 is also included for backflushing and decontaminating the inorganic membrane 601 when it is clogged by impurities. The backflushing assembly 7 includes an inlet component, which includes a hollow tube 701 installed inside the tank body 1. A penetrating sleeve 702 is slidably connected inside the hollow tube 701. The bottom of the hollow tube 701 is connected to the oil inlet pipe 3, and an outlet 703 is opened on the surface of the hollow tube 701, which is connected to the tank body 1. The core of the inlet component is a hollow tube 701 vertically installed in the center of the tank body 1. This tube serves as the main channel for pressurized oil to enter the tank body, and its bottom is directly connected to the oil inlet pipe 3 from the circulating pump, receiving pressurized waste lubricating oil. Under normal "membrane filtration separation" working conditions, pressurized oil enters the hollow tube 701 from the bottom. At this time, the oil pushes the penetrating sleeve 702, which is slidably connected inside the tube, to move upward by a specific stroke. This action is linked to other components such as the diaphragm 705 sealing the drain channel, creating a sealed environment for filtration. Subsequently, the oil undergoes initial diffusion and buffering through the tiny filter holes or gaps on the penetration sleeve 702, and finally exits from the outlet 703 pre-opened on the wall of the hollow tube 701, entering the cavity of the tank 1, and wetting and penetrating the inorganic membrane 601 from bottom to top to complete solid-liquid separation.

[0021] Furthermore, when impurities accumulate on the surface of the inorganic membrane 601, causing blockage and the internal pressure rises to a set threshold, the backflushing assembly 7 is triggered. At this time, the reversing sleeve 715, linked to the pressure sensing component, moves upward along the outer wall of the hollow tube 701. This closes the outlet 703, which was originally used for normal oil inlet, and simultaneously opens the corresponding reversing port 716, switching the oil inlet path to another channel. This causes the high-pressure oil to no longer flow horizontally from the outlet 703, but instead be transported upward through the cavity inside the reversing sleeve 715, providing a power source and path for subsequent top-down reverse flushing of the inorganic membrane 601. The inlet component, through the hollow tube 701, the penetration sleeve 702, the outlet 703, and the precise cooperation with the reversing sleeve 715, cleverly achieves the automatic switching between normal filtration and backflushing oil inlet paths under the two working modes. It is not only the inlet for oil, but also an automatic control valve that integrates pressure sensing and flow channel switching functions, ensuring that the equipment can operate intelligently, efficiently and continuously without the need for manual cleaning, which greatly reduces maintenance costs and operational complexity.

[0022] Furthermore, the backflushing assembly 7 also includes an outlet component, which includes a pressure plate 707 located above the inorganic membrane 601. A display rod 711 is connected to the pressure plate 707 via a connecting rod. The display rod 711 is slidably connected to the top of the tank 1. A sliding plate 713 is connected to the display rod 711, and a pressure spring 712 is connected to the sliding plate 713. The top of the pressure spring 712 abuts against the tank 1. A sliding sleeve 708 is fixedly connected to the pressure plate 707, and an opening 709 is formed on the surface of the sliding sleeve 708. The oil drain pipe 2 is located inside the tank 1 and has a drain port 710. The concentrated liquid after the inorganic membrane 601 filters the waste oil will enter the interior of the oil drain pipe 2 through the drain port 710 and be discharged. The pressure plate 707 is horizontally positioned directly above the inorganic membrane 601 assembly and is directly immersed in the oil in the tank. Its core function is to sense changes in the internal pressure of the tank 1. During normal filtration, concentrated oil that has not been permeated by the inorganic membrane 601 accumulates in the tank, causing the liquid level to rise and eventually act on the lower surface of the pressure plate 707. As the inorganic membrane 601 gradually becomes clogged due to surface impurities, the filtration resistance increases, and under constant pressure from the circulating pump, the pressure inside the tank rises accordingly. This pressure pushes the pressure plate 707 upwards, overcoming the resistance above. The pressure plate 707 is rigidly connected to a display rod 711 that vertically penetrates the top of the tank 1 via a connecting rod. A sliding seal is used between the display rod 711 and the tank body to ensure no leakage occurs during motion transmission. Operators can judge the internal pressure of the tank 1 based on the scale lines on the display rod 711. When the internal pressure is normal, the upward thrust on the pressure plate 707 is insufficient to fully compress the pressure spring 712, and the system is in equilibrium. Once membrane fouling worsens and the internal pressure rises, the pressure plate 707 receives a greater upward thrust, thereby pushing the display rod 711 and the sliding plate 713 upwards, compressing the pressure spring 712. This upward displacement directly reflects the pressure inside the tank and the degree of membrane blockage. Furthermore, the top of the display rod 711 serves as a visual indicator, allowing operators to directly observe or install sensors to monitor the equipment's operating status and determine whether backflushing is about to occur or has already occurred. In normal filtration mode, the sliding sleeve 708 is in the low position, and the drain port 710 is open, allowing the concentrate to flow smoothly into the drain pipe 2 for discharge. When the pressure plate 707 is pushed to a predetermined height due to membrane blockage, the sliding sleeve 708 moves upward simultaneously, its cylinder wall precisely sealing the drain port 710, thus cutting off the concentrate's discharge path. The pressure inside the tank is crucial for triggering backflushing, as it causes the tank pressure to rapidly redistribute or accumulate due to the outlet closure, providing the necessary pressure conditions for subsequent oil inlet reversal.

[0023] Furthermore, the backflushing assembly 7 also includes a sludge collection component 706, which includes a baffle 7062 fixed to the bottom of the tank 1. A sludge collection chamber 7061 is formed between the baffle 7062 and the tank 1. A spiral blade 7063 is installed inside the sludge collection chamber 7061. A drain pipe 4 is connected to the tank 1 and communicates with the sludge collection chamber 7061. The sludge collection chamber 7061 is formed by the baffle 7062 fixedly installed at the bottom of the tank 1 and the inner wall of the tank 1 itself. The baffle 7062 typically maintains an appropriate gap with the central oil inlet component, such as the hollow pipe 701, allowing the backflushed sludge to flow smoothly downwards. Simultaneously, it itself constitutes the inner boundary of the sludge collection chamber 7061, clearly separating the collection area from the central oil inlet area of ​​the equipment. When backflushing oil carrying a large amount of impurities flows into the sludge collection chamber 7061 from top to bottom, the spiral vane 7063 forces the fluid to move along its prescribed spiral path, forming a stable rotating flow field. This effectively avoids the "static" accumulation of impurities directly below the inlet caused by gravity. The spiral flow provides the fluid with a continuous tangential velocity, allowing solid particles to be smoothly pushed to the outer periphery of the chamber and transported downwards along the spiral channel under the combined action of centrifugal effect and fluid drag, greatly reducing the possibility of impurities clogging the flow path. This orderly spiral conveying mode ensures that high-concentration contaminants can be quickly and centrally guided to the drain pipe 4, which connects to the bottom of the sludge collection chamber 7061, thereby achieving efficient and thorough discharge of contaminants. The drain pipe 4 is directly connected to the outermost and lowest point of the sludge collection chamber 7061. This interface position design is to make full use of gravity and follow the natural trend of the spiral flow field, so that the contaminants and waste liquid collected here can be discharged from the system with minimal resistance.

[0024] Furthermore, a spacer 705 is slidably connected inside the tank body 1, and a guide plate 704 is slidably connected inside the spacer 705. The guide plate 704 is fixed to the surface of the hollow tube 701, and the spacer 705 is connected to the penetration sleeve 702 via a connecting rod. In normal filtration mode, the oil pressure entering from the oil inlet pipe 3 pushes the penetration sleeve 702 upward, and the penetration sleeve 702, through the connecting rod, simultaneously drives the spacer 705 to slide upward along the fixed guide plate 704. When the spacer 705 moves upward to a specific position, its upper part will tightly fit against or cover a specific annular gap on the inner wall of the tank body 1. This annular gap is the necessary channel for the dirt to enter the collection chamber 7061 downward during subsequent backflushing and sewage discharge. During backflushing, after the oil inlet path is switched, the high-pressure oil flows downwards, flushing the inorganic membrane 601. This downward fluid impact, along with the change in internal system pressure, pushes the pressure plate 707 and other related components, ultimately transmitting the force to the penetration sleeve 702, causing it to move downwards. The penetration sleeve 702, through a connecting rod, simultaneously drives the partition sleeve 705 to slide downwards. After the partition sleeve 705 moves downwards, it opens the previously closed annular drainage channel located between the guide plate 704 and the tank 1. The backflushed oil, carrying a large amount of stripped impurities, can then flow smoothly through this open annular channel downwards into the bottom collection chamber 7061, and finally be discharged from the drain pipe 4. This establishes an unobstructed discharge path for the backflushed waste.

[0025] It is worth noting that the recoil assembly 7 also includes a reversing component, which includes a reversing sleeve 715. The reversing sleeve 715 has a hollow internal structure and a reversing port 716. The reversing sleeve 715 is slidably connected to the surface of the hollow tube 701. An extension rod 714 is connected to the top of the reversing sleeve 715, and the top of the extension rod 714 is connected to the pressure plate 707. The cavity inside the reversing sleeve 715 communicates with the interior of the extension rod 714. Multiple conduits 717 are connected to the surface of the extension rod 714. A partition 718 is connected to the bottom of the pressure plate 707, and multiple through holes are formed on the partition 718. The top of the reversing sleeve 715 is rigidly connected to the pressure plate 707 above it through the extension rod 714. Therefore, the up-and-down movement of the pressure plate 707 directly determines the axial position of the reversing sleeve 715. In normal filtration, the reversing sleeve 715 is in a low position. At this time, the pressure inside the tank is normal, and the pressure plate 707 is in a low position under the action of the pressure spring 712. The reversing sleeve 715 is also in a low position through the extension rod 714. In this position, the tube wall of the reversing sleeve 715 closes the outlet 703 on the hollow tube 701, while its own reversing port 716 is in an ineffective position that is not connected to any flow channel. After the oil from the oil inlet pipe 3 passes through the hollow tube 701 and the penetrating sleeve 702, it can only flow out horizontally and radially from the opened outlet 703 and enter the bottom of the tank 1 to start the normal filtration process from bottom to top. During the backflushing state, the reversing sleeve 715 is in a high position. When membrane blockage causes an increase in pressure inside the tank, the pressure plate 707 is pushed up, compressing the pressure spring 712 and causing the reversing sleeve 715 to move upward. The cylindrical part of the reversing sleeve 715 slides upward, completely covering and sealing the outlet 703 on the hollow tube 701, cutting off the normal bottom-up oil inlet path. At the same time, the reversing port 716 on the reversing sleeve 715 moves upward, aligning and connecting with a higher-level internal channel or space on the hollow tube 701. The high-pressure oil can no longer flow out from the sealed outlet 703, but instead enters the internal cavity of the reversing sleeve 715 through the newly connected reversing port 716. Subsequently, the oil continues upward, flowing through the internal channel of the extension rod 714, and finally out from multiple conduits 717 radially distributed on the surface of the extension rod 714. This generates a top-down scouring force, scouring the surface of the inorganic membrane 601.

[0026] It is worth noting that the recoil assembly 7 also includes a damping component, which includes a support rod 720. The bottom of the support rod 720 is connected to the slide plate 713, and the top of the support rod 720 is connected to a ball 721. A damping cavity 719 is provided at the top of the tank 1, and damping fluid is filled inside the damping cavity 719. The ball 721 is located in the damping fluid, and the support rod 720 is slidably connected to the damping cavity 719. This component is directly linked to the motion core of the recoil assembly 7 through a support rod 720. The bottom of the support rod 720 is fixedly connected to the slide plate 713, and the slide plate 713, the display rod 711, the pressure spring 712, and the pressure plate 707 above it constitute an integrated moving component. Therefore, the motion state of the support rod 720 directly and in real time reflects the vertical displacement of the pressure plate 707. A damping cavity 719 is specially provided at the top of the tank 1, which is filled with a damping fluid of a certain viscosity, such as silicone oil or special hydraulic oil. The top of the support rod 720 extends into the damping cavity 719 and is connected to a ball 721 or a piston head of similar shape. A sliding seal is used at the interface between the support rod 720 and the damping cavity 719 to ensure no leakage of the damping fluid while allowing the support rod 720 to move freely up and down. As the pressure inside the tank gradually increases, pushing the pressure plate 707 upward, it causes the support rod 720 and its top ball 721 to move upward in the damping fluid. Due to the viscosity of the damping fluid, the ball 721 experiences significant fluid resistance as it moves through the liquid; this resistance manifests as a damping force opposite to the direction of movement. This damping force effectively slows down the upward speed of the pressure plate 707, preventing the system from becoming overly sensitive to frequent starts and stops or generating violent oscillations due to instantaneous pressure fluctuations. This ensures that the backflush procedure is smoothly triggered only when membrane blockage reaches a sustained and stable threshold. Furthermore, during the backflushing operation, there is a certain amount of oil in the tank. If no damping device is installed, when the oil in the tank flows out along the drain channel, the pressure spring 712 will release pressure quickly, thereby reducing the backflushing time and potentially causing incomplete rinsing of the inorganic membrane 601.

[0027] An environmentally friendly waste lubricating oil desolidification and purification process: Step 1: Initial pressurization. The waste lubricating oil is pressurized using an external circulating pump and injected into tank 1. Step 2: Membrane filtration. After being pressurized, the oil will pass through the inorganic membrane module 6, and the inorganic membrane 601 will be used to separate the oil through membrane filtration. Step 3: Drainage. The permeated oil after membrane filtration enters the interior of downstream component 5 through the pipeline, while the concentrated oil that has not been permeated will enter the interior of drain pipe 2 through the pipeline and be discharged outward. Step 4: Backflushing operation. When the pressure injected by the circulating pump remains constant, the internal pressure of tank 1 reaches a certain value, which means that there are many deposits on the surface of inorganic membrane 601, affecting the filtration and separation efficiency. Then, the oil injected by the oil inlet pipe 3 will be reversed, changing from bottom to top to top to bottom, and the surface of inorganic membrane 601 will be flushed in reverse. The flushed oil and impurities will be discharged autonomously from the position of drain pipe 4. Step 5: Gravity damping reset. After the backflush is completed, the commutator will automatically sink and reset under its own gravity, and return to the "membrane filtration separation state".

[0028] The working principle is as follows: First, the lubricating waste oil is transported to the circulating pump through pipelines. The circulating pump pressurizes the oil, which then enters the tank 1 through the inlet pipe 3. The oil flows into the hollow tube 701, then exits through the internal filter holes of the penetration sleeve 702, enters the upper part of the hollow tube 701, and finally exits through the outlet 703 into the tank 1. Simultaneously, the oil continuously flows upwards. As it passes through the penetration sleeve 702, the oil pushes the sleeve upwards a certain distance. The penetration sleeve 702 then... The rod moves the spacer 705 upward, thereby sealing the gap between the guide plate 704 and the tank 1. This gap serves as the channel for subsequent sewage discharge. When the oil enters the tank 1, it comes into contact with the inorganic membrane 601, which filters the oil. Permeable liquids in the oil will penetrate the surface of the inorganic membrane 601 and enter the permeation chamber 604, flowing into the connecting pipe 602. From there, it flows into the downstream component 5 through the bottom outlet pipe 603. The downstream component 5 can be a storage tank or an evaporator / crystallizer for further processing of the permeate, thus achieving the resource recycling of the oil. Because oil is continuously being added to the tank 1, as the oil is continuously injected, once a certain height is reached, the oil that has not been filtered and separated by the inorganic membrane 601 forms a concentrate. This concentrate will then enter the drain pipe 2 from the upper inlet 710, and finally be discharged into the external equipment container.Meanwhile, considering that with prolonged use, impurities will inevitably adhere to the surface of the inorganic membrane 601, clogging its permeation pores, the vertical placement of the inorganic membrane 601 serves another purpose: large oil particles and impurities will sink along the vertical surface of the inorganic membrane 601, accumulating at the bottom of the tank 1, i.e., on the surface of the guide plate 704. Furthermore, some strongly adhering impurities, once attached to the surface of the inorganic membrane 601, will reduce its permeation efficiency, meaning a decrease in the overall permeation volume. If the pump's delivery pressure remains constant, the pressure inside the tank 1 will increase, causing the oil to gradually rise and lift the pressure plate 707. The pressure plate 707, through a connecting rod, transmits the upward pressure to the pressure spring 712, generating a certain compressive force on the spring. Once the pressure plate 707 reaches a certain height, it will simultaneously drive the sliding sleeve 708 upward. After the 08 moves upward to a certain distance, the sliding sleeve 708 will move to cover the drain port 710 of the oil drain pipe 2, thereby sealing the drain port 710. So at this time, the oil outlet is closed. After the pressure plate 707 moves upward, it will also drive the reversing sleeve 715 to move upward through the extension rod 714. The upward movement of the reversing sleeve 715 will synchronously rise and seal the liquid outlet 703 of the hollow tube 701 below. At this time, the reversing port 716 on the reversing sleeve 715 will be aligned with the liquid outlet 703. At this time, the oil will be injected from the position of the reversing port 716 into the interior of the reversing sleeve 715. Then, through the internal connecting pipe, from the interior of the extension rod 714, through multiple conduits 717, the oil flow direction will be from top to bottom. After passing through the partition 718, it will achieve reverse flushing of the inorganic membrane 601 from top to bottom, flushing away some impurities attached to the surface and maintaining the permeation flux of the inorganic membrane 601. Afterwards, the backwashing oil will flow downwards, pushing the septum 705 down, thus exposing the gap between the guide plate 704 and the tank 1. Solid oil will then flow downwards through this gap into the collection chamber 7061. The spiral blade 7063 utilizes a spiral channel to push the solid oil from the spiral channel into the drain pipe 4 after the backwashing, ultimately discharging the impurities and achieving overall backwashing. After a certain period of flushing, once the permeation flux of the inorganic membrane 601 recovers (i.e., after increased permeation), the pressure plate 707, through multiple connected structures and the elasticity of the pressure spring 712, controls its downward reset, autonomously returning to its initial membrane filtration state. The damping element is designed to provide some damping to the pressure spring 712, preventing backflushing contact due to the elasticity at the start of backflushing when the flushing time is short. By utilizing the damping fluid, the pressure spring 712 generates a certain amount of damping, indirectly controlling the pressure plate 707 to move slowly downward. Simultaneously, the buffer solution also controls the pressure plate 707 to move slowly upward, indirectly improving the stability of the equipment's operation.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An environment-friendly waste lubricating oil de-solids and purification apparatus, characterized in that, Include: Tank body (1); Inorganic membrane assembly (6) for purifying and separating waste lubricating oil; Downstream piece (5) for receiving lubricating oil purified and separated by inorganic membrane assembly (6); The top of the tank body (1) is connected with the oil discharge pipe (2), the bottom of the tank body (1) is connected with the oil inlet pipe (3), one end of the oil inlet pipe (3) is connected with the external circulating pump, the inorganic membrane assembly (6) is connected with the downstream piece (5) through the pipeline; The inorganic membrane assembly (6) comprises an inorganic membrane (601), an internal permeation cavity (604) is arranged in the inorganic membrane (601), a communication pipe (602) is communicated in the permeation cavity (604), and the inorganic membrane (601) is arranged in the inside of the tank body (1).

2. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 1, characterized in that: The bottom of the communication pipe (602) is communicated with the oil outlet pipe (603), the right end of the oil outlet pipe (603) is communicated with the downstream piece (5), and the inorganic membrane (601) is in a spiral structure.

3. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 1, characterized in that: It also includes a backflushing assembly (7) for backflushing and removing dirt when the inorganic membrane (601) is blocked by impurities; The backflushing assembly (7) comprises an inlet piece, the inlet piece comprises a hollow pipe (701), the hollow pipe (701) is installed in the inside of the tank body (1), a penetrating sleeve (702) is slidably connected in the inside of the hollow pipe (701), the bottom of the hollow pipe (701) is communicated with the oil inlet pipe (3), a liquid outlet (703) is formed in the surface of the hollow pipe (701), and the liquid outlet (703) is communicated with the tank body (1).

4. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 3, characterized in that: The backflushing assembly (7) further comprises an outlet piece, the outlet piece comprises a pressure sheet (707), the pressure sheet (707) is located above the inorganic membrane (601), a display rod (711) is connected to the pressure sheet (707) through a connecting rod, the display rod (711) is slidably connected to the top of the tank body (1), a sliding plate (713) is connected to the display rod (711), a pressure spring (712) is connected to the sliding plate (713), the top of the pressure spring (712) abuts against the tank body (1), a sliding sleeve (708) is fixedly connected to the pressure sheet (707), an opening (709) is formed in the surface of the sliding sleeve (708), a drainage port (710) is formed in the inside of the tank body (1), and the concentrated solution filtered by the inorganic membrane (601) will enter the inside of the oil discharge pipe (2) from the position of the drainage port (710) and be discharged.

5. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 4, characterized in that: The backflushing assembly (7) further comprises a dirt collecting piece (706), the dirt collecting piece (706) comprises a baffle (7062), the baffle (7062) is fixed to the bottom of the tank body (1), a dirt collecting cavity (7061) is formed between the baffle (7062) and the tank body (1), a spiral sheet (7063) is arranged in the inside of the dirt collecting cavity (7061), a dirt discharge pipe (4) is connected to the tank body (1), and the dirt discharge pipe (4) is communicated with the dirt collecting cavity (7061).

6. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 5, characterized in that: The tank body (1) is slidably connected with a spacer sleeve (705), the spacer sleeve (705) is slidably connected with a guide plate (704), the guide plate (704) is fixed on the surface of the hollow tube (701), and the spacer sleeve (705) is connected with the penetrating sleeve (702) through a connecting rod.

7. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 6, characterized in that: The backflushing assembly (7) further comprises a reversing piece, the reversing piece comprises a reversing sleeve (715), the reversing sleeve (715) is internally hollow, a reversing port (716) is formed in the reversing sleeve (715), the reversing sleeve (715) is slidably connected on the surface of the hollow tube (701), an extension rod (714) is connected on the top of the reversing sleeve (715), the top of the extension rod (714) is connected with a pressure sheet (707), the cavity in the reversing sleeve (715) is in communication with the inside of the extension rod (714), a plurality of conduits (717) are in communication with the surface of the extension rod (714), a plurality of through holes are formed in a partition plate (718) connected on the bottom of the pressure sheet (707).

8. The environment-friendly waste lubricating oil de-solids and purification apparatus according to claim 7, characterized in that: The backflushing assembly (7) further comprises a damping piece, the damping piece comprises a supporting rod (720), the bottom of the supporting rod (720) is connected on a sliding plate (713), a spherical body (721) is connected on the top of the supporting rod (720), a damping cavity (719) is formed on the top of the tank body (1), damping liquid is arranged in the damping cavity (719), the spherical body (721) is located in the damping liquid, and the supporting rod (720) is slidably connected with the damping cavity (719).

9. An environment-friendly process for the de-solids and purification of used lubricating oil, characterized in that, The environment-friendly waste lubricating oil defatting and purifying equipment is applied to any one of claims 1-8, and comprises the following steps: Step one: initial pressurization, the input waste lubricating oil is pressurized by using the external circulating pump and injected into the tank body (1); Step two: membrane filtration, the oil liquid after pressurization passes through the inorganic membrane assembly (6) and is subjected to membrane filtration separation by using the inorganic membrane (601); Step three: liquid discharge, the permeated oil liquid after membrane filtration enters the inside of the downstream piece (5) through the pipeline, and the concentrated oil liquid not permeated enters the inside of the oil discharge pipe (2) through the pipeline and is discharged outward; Step four: backflushing operation, when the pressure injected by the circulating pump is unchanged, the inside pressure of the tank body (1) reaches a certain value, the surface of the inorganic membrane (601) is attached with more matters, the filtration separation efficiency is affected, then the oil liquid injected by the oil inlet pipe (3) is reversed, is converted from downward to upward, and reversely flushes the surface of the inorganic membrane (601), and the oil liquid and impurities after flushing are automatically discharged from the position of the blowdown pipe (4); Step five: gravity damping reset, after backflushing, the reversing piece is automatically reset and sunk according to the gravity thereof, and is converted to the "membrane filtration separation state" again.

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