Efficient microfiltration negative pressure flocculation and sedimentation device for waste oil

Abstract

The utility model provides a kind of waste oil high-efficiency microfiltration negative pressure flocculation settling device, and the device includes first reaction pool and second reaction pool.There is negative pressure reaction cavity in first reaction pool, negative pressure pump is equipped on its upper side, and side wall liquid inlet is connected with liquid inlet pipeline (pipeline extends to cavity).Second reaction pool is located at the bottom of first reaction pool, and there is sedimentation cavity in it, and the both are communicated by center tube with microfiltration membrane at top end;Center tube bottom end extends to the middle of sedimentation cavity and is equipped with reflecting mechanism, and there is sludge hopper in the bottom of second reaction pool.The inner wall of sedimentation cavity is fixedly connected with weir (position is higher than reflecting mechanism), and weir side wall water outlet is connected with water outlet pipeline.The utility model is assisted by negative pressure reaction cavity and negative pressure pump to help liquid reaction, combined with microfiltration membrane filtration, sedimentation cavity sedimentation and reflecting mechanism auxiliary separation, which can realize solid-liquid effective separation, and can collect sludge through sludge hopper, weir and water outlet pipeline discharge clear liquid, improve processing efficiency and effect.

Description

Technical Field

[0001] This utility model relates to the field of oil-water separation technology, and more specifically, to a high-efficiency microfiltration negative pressure flocculation sedimentation device for waste oil. Background Technology

[0002] The high-efficiency microfiltration negative pressure flocculation sedimentation device for waste oil is mainly used for the purification and recycling of various types of waste oil, such as industrial waste oil and engine waste oil. It removes impurities, colloidal particles, and moisture from the waste oil through flocculation sedimentation, and then combines this with microfiltration technology to achieve deep purification of the waste oil, meeting industrial reuse or subsequent processing standards. Currently, with increasingly stringent environmental protection requirements and growing demand for resource recycling, the waste oil recycling industry has an increasingly urgent need for efficient and low-cost treatment equipment, making the combination of microfiltration and flocculation sedimentation technology the mainstream approach.

[0003] Existing waste oil treatment solutions typically employ a step-by-step treatment model of "traditional flocculation and sedimentation followed by separate microfiltration": waste oil is first injected into an open-top flocculation reactor, flocculant is added, and the mixture is allowed to settle. After the flocs form and separate into layers, the upper layer of preliminarily purified waste oil is then transferred to a microfiltration device for filtration. This solution purifies waste oil through a step-by-step operation, but it has several shortcomings: First, traditional flocculation sedimentation uses an open design without negative pressure, resulting in slow floc formation, long sedimentation cycles, and easy floc dispersion leading to incomplete sedimentation. Subsequent microfiltration needs to handle a greater load of impurity filtration. Second, step-by-step treatment requires two independent sets of equipment, which not only occupy a large area and have high equipment investment costs, but also make the waste oil susceptible to secondary oxidation due to contact with air during transportation, or cause environmental pollution due to leakage during transportation. In addition, due to insufficient pretreatment, the microfiltration membrane is easily clogged by fine impurities, requiring frequent shutdowns for cleaning or replacement of the filter membrane, which not only reduces treatment efficiency but also significantly increases operation and maintenance costs. At the same time, most existing microfiltration equipment is designed for atmospheric pressure, resulting in slow filtration speeds, which is difficult to meet the needs of large-scale continuous waste oil treatment.

[0004] Therefore, there is an urgent need for a technology to replace the existing waste oil treatment method of "step-by-step equipment + inefficient collaboration" in order to solve the problems of how to shorten the waste oil treatment cycle, reduce equipment size, reduce filter membrane wear costs, and improve waste oil purification efficiency and purity. Summary of the Invention

[0005] In view of this, this utility model proposes a high-efficiency microfiltration negative pressure flocculation sedimentation device for waste oil, which aims to solve the problems of how to shorten the waste oil treatment cycle, reduce the equipment volume, and improve the waste oil purification efficiency and purity.

[0006] In one aspect, this utility model provides a high-efficiency microfiltration negative pressure flocculation sedimentation device for waste oil, comprising: The first reaction tank has a negative pressure reaction chamber inside. A negative pressure pump is installed on the upper surface of the first reaction tank above the negative pressure reaction chamber. An inlet is provided on the side wall of the negative pressure reaction chamber. The inlet is connected to an inlet pipe, and the inlet pipe extends into the negative pressure reaction chamber through the inlet. The second reaction tank is located at the bottom of the first reaction tank. A sedimentation chamber is provided inside the second reaction tank. The sedimentation chamber is connected to the negative pressure reaction chamber through a central tube. A microfiltration membrane is provided at the top of the central tube, and the bottom of the central tube extends to the middle of the sedimentation chamber. A reflection mechanism is provided at the bottom of the central tube. A sludge hopper is provided at the bottom of the second reaction tank. The sedimentation chamber has a weir fixed to its inner wall. The weir is positioned higher than the reflection mechanism. The weir has an outlet on its side wall, which is connected to a water outlet pipe.

[0007] Furthermore, the reflecting mechanism includes: The connecting part is composed of several connecting plates, which are radially fixed to the bottom end of the central tube; A reflector plate is fixed to the end of the connecting plate away from the central tube.

[0008] Furthermore, a motor housing is provided on one side of the first reaction tank, and a slag discharge chamber is provided between the motor housing and the first reaction tank. A slag removal mechanism is provided at the top of the negative pressure reaction chamber of the first reaction tank.

[0009] Furthermore, the slag removal mechanism includes: A filter tank, the upper surface of which is fixed to the top of the negative pressure reaction chamber, has a leakage hole on the inner wall of the filter tank, and the side wall of the filter tank is connected to the liquid inlet pipe. The slag discharge section has one end located inside the filter tank and the other end passing through the inner wall of the filter tank, the first reaction tank, the slag discharge chamber, and into the motor housing. The outer surface of the slag discharge section located in the filter tank, the first reaction tank, and the slag discharge chamber is provided with threads, and the slag discharge section is rotatably connected to the inner wall of the filter tank, the first reaction tank, and the slag discharge chamber.

[0010] Furthermore, a leak-proof pipe is provided between the slag discharge chamber and the filter tank. The leak-proof pipe is sleeved on the outer side of the slag discharge section, and the leak-proof pipe is rotatably connected to the slag discharge section.

[0011] Furthermore, a drive motor is installed inside the motor housing, and a first bevel gear is installed at the output end of the drive motor. A motor frame is installed inside the motor housing to support the drive motor.

[0012] Furthermore, a second bevel gear is provided at the end of the slag discharge section located inside the motor housing, and the second bevel gear meshes with the first bevel gear.

[0013] Furthermore, the bottom of the slag discharge chamber is V-shaped, and the bottom end of the slag discharge chamber is connected to a slag discharge pipe, which is connected to the bottom of the sludge hopper of the second reaction tank.

[0014] Furthermore, the device is also provided with a cleaning mechanism, which is disposed above the filter tank, and the cleaning mechanism includes: A cleaning pipe is fixedly connected to the top of the negative pressure reaction chamber; Nozzles are evenly distributed on the sides of the cleaning pipe; One end of the cleaning pipe passes through the inner wall of the negative pressure reaction chamber to the outer side of the first reaction tank and is connected to the water supply tank. A water supply pump is installed on the outer side of the cleaning pipe.

[0015] Furthermore, support columns are provided on the lower surfaces of the first reaction tank and the motor housing.

[0016] Compared with existing technologies, the beneficial effects of this utility model are as follows: the negative pressure reaction chamber of the first reaction tank, combined with a negative pressure pump, can accelerate floc formation, prevent floc dispersion, and significantly shorten the settling cycle; the reflection mechanism of the second reaction tank can also prevent settled flocs from floating again, solving the problem of slow and incomplete traditional open-type settling; the device integrates flocculation, microfiltration, and sedimentation functions into one unit, eliminating the need for independent equipment and waste oil transfer, reducing land occupation and investment costs, and avoiding oxidation and leakage pollution during transfer, thus solving the drawbacks of dispersed step-by-step treatment equipment; the microfiltration membrane at the top of the central tube, combined with negative pressure boosting, not only reduces the probability of membrane clogging due to sufficient pretreatment, but also reduces maintenance frequency and costs, and improves filtration speed, solving the problems of low efficiency and high membrane loss in traditional microfiltration; the weir design of the sedimentation chamber ensures that only fully purified waste oil is discharged, and in conjunction with the sludge hopper, achieves efficient solid-liquid separation, solving the problem of flocs in the supernatant of traditional sedimentation, ultimately achieving improved waste oil treatment efficiency and purity, and reduced costs, meeting the needs of large-scale high-efficiency purification. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of the waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device provided in the embodiment of this utility model; Figure 2 A side view of the waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device provided in this embodiment of the utility model; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0018] In the diagram: 100-First reaction tank; 101-Negative pressure pump; 110-Negative pressure reaction chamber; 120-Inlet pipe; 121-Inlet; 130-Microfiltration membrane; 140-Filter tank; 150-Slag removal mechanism; 151-Leakage prevention pipe; 152-Second bevel gear; 153-Slag discharge section; 154-Leakage hole; 155-Nozzle; 200-Second reaction tank; 210-Sedimentation chamber; 220-Outlet pipe; 221-Outlet. 230-Sludge hopper; 240-Weir; 250-Central pipe; 260-Reflection mechanism; 261-Connecting part; 262-Reflector plate; 300-Motor box; 310-Drive motor; 311-First bevel gear; 320-Motor frame; 400-Slag discharge chamber; 410-Slag discharge pipe; 411-Slag discharge port; 500-Cleaning mechanism; 510-Cleaning pipe; 520-Water supply pump; 530-Water supply tank; 600-Support column. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] See Figures 1-3 As shown in the figure, this embodiment provides a waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device, including: a first reaction tank 100 and a second reaction tank 200.

[0024] Specifically, the first reaction tank 100 has a negative pressure reaction chamber 110 inside. A negative pressure pump 101 is installed on the upper surface of the first reaction tank 100 above the negative pressure reaction chamber 110. An inlet 121 is opened on the side wall of the negative pressure reaction chamber 110. The inlet 121 is connected to the inlet pipe 120. The inlet pipe 120 extends into the negative pressure reaction chamber 110 through the inlet 121. The second reaction tank 200 is located at the bottom of the first reaction tank 100. A sedimentation chamber 210 is provided inside the second reaction tank 200. The sedimentation chamber 210 is connected to the negative pressure reaction chamber 110 through a central tube 250. A microfiltration membrane 130 is provided at the top of the central tube 250, and the bottom end of the central tube 250 extends to the middle of the sedimentation chamber 210. A reflection mechanism 260 is provided at the bottom end of the central tube 250. A sludge hopper 230 is provided at the bottom of the second reaction tank 200. The sedimentation chamber 210 has a weir 240 fixed to its inner wall. The weir 240 is positioned higher than the reflection mechanism 260. The side wall of the weir 240 has an outlet 221, which is connected to the outlet pipe 220.

[0025] The above embodiment, through the negative pressure reaction chamber 110 of the first reaction tank 100 in conjunction with the negative pressure pump 101, can accelerate floc formation, prevent floc dispersion, and significantly shorten the settling cycle. The reflection mechanism 260 of the second reaction tank 200 can also prevent the settled flocs from floating again, solving the problem of slow and incomplete traditional open-type settling. The device integrates flocculation, microfiltration, and sedimentation functions into one unit, eliminating the need for independent equipment and waste oil transfer. This reduces land occupation and investment costs, and avoids oxidation and leakage pollution during transfer, solving the drawbacks of dispersed step-by-step treatment equipment. The microfiltration membrane 130 at the top of the central tube 250, combined with negative pressure boosting, not only reduces the probability of membrane clogging due to sufficient pretreatment, but also reduces maintenance frequency and costs, and improves filtration speed, solving the problems of low efficiency and high membrane loss in traditional microfiltration. The weir 240 design of the sedimentation chamber 210 ensures that only fully purified waste oil is discharged, and in conjunction with the sludge hopper 230, achieves efficient solid-liquid separation, solving the problem of flocs in the supernatant of traditional sedimentation. Ultimately, it achieves improved waste oil treatment efficiency and purity, and reduced costs, meeting the needs of large-scale high-efficiency purification.

[0026] See Figure 3 As shown, the reflecting mechanism 260 includes: The connecting part 261 is composed of several connecting plates, which are radially fixed to the bottom end of the central tube 250; The reflector 262 is fixed to the end of the connecting plate away from the central tube 250.

[0027] In a specific embodiment of this application, the above steps are implemented in the following ways: When the waste oil to be treated is transported to the negative pressure reaction chamber 110 of the first reaction tank 100 through the liquid inlet pipe 120, the negative pressure pump 101 is started to maintain a stable negative pressure environment in the negative pressure reaction chamber 110. The waste oil and the pre-added flocculant are quickly mixed under the action of negative pressure, and the impurity particles collide and aggregate to form flocs (compared with traditional open flocculation, the floc formation cycle is shortened by about 50%). After flocculation, the waste oil needs to enter the sedimentation chamber 210 of the second reaction tank 200 for solid-liquid separation. At this time, the waste oil will flow downward through the central pipe 250 connecting the negative pressure reaction chamber 110 and the sedimentation chamber 210. The reflection mechanism 260 plays a key role in this "liquid entering the sedimentation chamber 210" process. Specifically, the connecting part 261 of the reflection mechanism 260 is composed of 3-4 connecting plates. These connecting plates are radially and uniformly fixed with the bottom end of the central pipe 250 as the center (the angle between adjacent connecting plates is 90°-120°), ensuring that the reflection plate 262 can form a ring-shaped coverage area below the central pipe 250. The reflection plate 262 is vertically fixed at the end of each connecting plate away from the central pipe 250, and the reflection plate 262 as a whole is at an angle of "tilted downward" (the angle with the horizontal direction is 30°-45°). When waste oil flows out from the bottom of the central pipe 250, it directly impacts the inclined surface of the reflector plate 262. The originally vertically downward liquid flow is changed by the obstruction and guidance of the reflector plate 262 to "slowly flow downward along the inner wall of the sedimentation chamber 210", instead of directly impacting the sludge hopper 230 at the bottom of the sedimentation chamber 210. This change in flow direction effectively avoids two major problems: first, it prevents the high-speed falling waste oil from impacting the flocs that have settled in the sludge hopper 230 (in the traditional design without the reflector mechanism 260, direct liquid flow to the bottom of the tank will cause the sludge to resuspend, resulting in secondary pollution); second, it allows the small flocs that have not completely settled to have sufficient time to slowly sink to the sludge hopper 230 under the action of gravity during the flow of waste oil along the wall (the flow velocity is reduced from 0.8m / s in the traditional direct flow to below 0.2m / s). Meanwhile, since the reflection mechanism 260 is located in the middle of the sedimentation chamber 210, and the weir 240 on the inner wall of the sedimentation chamber 210 is higher than the reflection mechanism 260, the waste oil flowing down the wall will form a stratification of "upper clear liquid + lower flocs" in the sedimentation chamber 210: the upper layer of pure clear liquid without suspended flocs will overflow into the weir 240 and be discharged through the outlet 221 and the outlet pipe 220 (the impurity content of the finally discharged waste oil can be reduced to below 0.1%); the lower layer of flocs will continue to settle to the bottom sludge hopper 230, and after accumulating to a certain amount, it will be discharged through the outlet of the sludge hopper 230.Throughout the process, the reflective mechanism 260, through its structural design of "radial connecting plate + inclined reflective plate 262", precisely controls the flow direction and velocity of waste oil entering the sedimentation chamber 210. It works in synergy with the microfiltration membrane 130 at the top of the central tube 250 (which intercepts large-sized flocs in advance) and the weir 240 of the sedimentation chamber 210 (which filters pure liquid), ultimately achieving a highly efficient connection between "flocculation-microfiltration-sedimentation". This completely solves the problem of "flocs floating up again and incomplete separation" in traditional open sedimentation, ensuring the purity and efficiency of waste oil purification.

[0028] The above scenarios are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0029] See Figure 3 As shown, a motor box 300 is provided on one side of the first reaction tank 100, and a slag discharge chamber 400 is provided between the motor box 300 and the first reaction tank 100. A slag removal mechanism 150 is provided on the top of the negative pressure reaction chamber 110 of the first reaction tank 100.

[0030] Specifically, the slag removal mechanism 150 includes: The filter tank 140 has its upper surface fixed to the top of the negative pressure reaction chamber 110. The inner wall of the filter tank 140 is provided with a leakage hole 154. The side wall of the filter tank 140 is connected to the liquid inlet pipe 120. The slag discharge section 153 has one end located inside the filter tank 140 and the other end passing through the inner wall of the filter tank 140, the first reaction tank 100, the slag discharge chamber 400 and the motor housing 300. The outer surface of the slag discharge section 153 located at the filter tank 140, the first reaction tank 100 and the slag discharge chamber 400 is provided with threads. The slag discharge section 153 is rotatably connected to the inner wall of the filter tank 140, the first reaction tank 100 and the slag discharge chamber 400.

[0031] Specifically, a leak-proof pipe 151 is provided between the slag discharge chamber 400 and the filter tank 140. The leak-proof pipe 151 is sleeved on the outer side of the slag discharge section 153, and the leak-proof pipe 151 is rotatably connected to the slag discharge section 153.

[0032] Specifically, a drive motor 310 is installed inside the motor housing 300, and a first bevel gear 311 is installed at the output end of the drive motor 310. A motor frame 320 is installed inside the motor housing 300 to support the drive motor 310.

[0033] Specifically, the end of the slag discharge section 153 located inside the motor housing 300 is provided with a second bevel gear 152, which meshes with the first bevel gear 311.

[0034] Specifically, the bottom of the slag discharge chamber 400 is V-shaped, and the bottom of the slag discharge chamber 400 is connected to the slag discharge pipe 410, which is connected to the bottom of the sludge hopper 230 of the second reaction tank 200.

[0035] In a specific embodiment of this application, the above steps are implemented as follows: The liquid to be processed is transported to the filter tank 140 through the inlet pipe 120. Since the inner wall of the filter tank 140 is provided with a leakage hole 154, and the upper surface of the filter tank 140 is fixedly connected to the top of the negative pressure reaction chamber 110 of the first reaction tank 100, the liquid can flow smoothly into the negative pressure reaction chamber 110 of the first reaction tank 100 through the leakage hole 154 under the action of negative pressure to react. The solid residue contained in the liquid is intercepted in the filter tank 140, realizing the initial separation of solid and liquid. When the residue in the filter tank 140 accumulates to a certain amount, the drive motor 310 in the motor box 300 is started (the motor frame 320 provides stable support for the drive motor 310). The first bevel gear 311 at the output end of the drive motor 310 rotates accordingly. Since the first bevel gear 311 meshes with the second bevel gear 152 located at the inner end of the slag discharge part 153, it can drive the slag discharge part 153 to rotate as a whole. The outer surface of the slag discharge section 153 is threaded at the filter tank 140, the first reaction tank 100, and the slag discharge chamber 400, and is rotatably connected to the inner wall of each component. During rotation, the threaded structure breaks up large residues in the filter tank 140 and continuously pushes smaller residues towards the slag discharge chamber 400. During this process, the leak-proof pipe 151 between the filter tank 140 and the slag discharge chamber 400 is sleeved on the outside of the slag discharge section 153 and rotatably connected to it, which can effectively prevent liquid or residues in the negative pressure reaction chamber 110 from leaking out from the gap between the slag discharge section 153 and the filter tank 140, ensuring the sealing of the device. The residues pushed into the slag discharge chamber 400, due to the V-shaped structure at the bottom of the slag discharge chamber 400, will accumulate at the bottom of the chamber under gravity, and finally be transported to the bottom of the sludge hopper 230 of the second reaction tank 200 for further treatment through the slag discharge pipe 410 connected to the bottom of the slag discharge chamber 400, thus completing the entire slag removal process. The entire process, through the combination of mechanical transmission and structural design, achieves automatic separation, transportation and collection of residues, thereby improving the continuity and stability of the reaction system.

[0036] The above scenarios are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0037] Specifically, support columns 600 are provided on the lower surfaces of the first reaction tank 100 and the motor housing 300.

[0038] See Figure 3 and Figure 4As shown, the device also includes a cleaning mechanism 500, which is positioned above the filter tank 140. The cleaning mechanism 500 includes: Cleaning pipe 510, which is fixedly connected to the top of negative pressure reaction chamber 110; Nozzles 155 are evenly distributed on the side of the cleaning pipe 510; One end of the cleaning pipe 510 passes through the inner wall of the negative pressure reaction chamber 110 to the outer side of the first reaction pool 100 and is connected to the water supply tank 530. A water supply pump 520 is installed on the outer side of the cleaning pipe 510.

[0039] In a specific embodiment of this application, the above steps are implemented as follows: When the filter tank 140 intercepts blocky impurities and large particle residues in waste oil for a long time, the impurities easily adhere to the inner wall of the filter tank 140 and around the leakage hole 154, causing the leakage hole 154 to become blocked, the flow rate of waste oil into the negative pressure reaction chamber 110 to slow down, or even damage the negative pressure environment of the negative pressure reaction chamber 110. At this time, the filter tank 140 needs to be cleaned as needed by the cleaning mechanism 500. The implementation method is as follows: the cleaning pipe 510 of the cleaning mechanism 500 is fixedly connected to the top of the negative pressure reaction chamber 110 in a sealed manner, one end penetrates the inner wall of the negative pressure reaction chamber 110 (the penetration is treated to prevent leakage) and is connected to the external water supply tank 530, and the water supply pump 520 on the outer side of the pipe is connected to the device. The system is linked to the control system. When the pressure difference between the inlet and outlet of the filter tank 140 exceeds the standard or the preset cleaning cycle is reached, the water supply pump 520 starts, draws clean water from the water supply tank 530, pressurizes it and delivers it to the cleaning pipe 510. The clean water is sprayed through nozzles 155 that are evenly distributed on the side of the pipe and angled towards the filter tank 140. The high-pressure water flow (or atomized water flow) is sprayed onto the inner wall of the filter tank 140 and the leakage hole 154, washing away the attached impurities. The detached impurities fall into the sludge discharge chamber 400 under the action of negative pressure or with the water flow through the filter tank 140, and finally discharged into the sludge hopper 230 through the sludge discharge pipe 410. The filter tank 140 does not need to be disassembled throughout the process, achieving efficient cleaning without stopping the machine or with short-term shutdown, and avoiding the accumulation of impurities that affect the filtration efficiency and negative pressure stability of the device.

[0040] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency microfiltration negative pressure flocculation sedimentation device for waste oil, characterized in that, include: The first reaction tank has a negative pressure reaction chamber inside. A negative pressure pump is installed on the upper surface of the first reaction tank above the negative pressure reaction chamber. An inlet is provided on the side wall of the negative pressure reaction chamber. The inlet is connected to an inlet pipe, and the inlet pipe extends into the negative pressure reaction chamber through the inlet. The second reaction tank is located at the bottom of the first reaction tank. A sedimentation chamber is provided inside the second reaction tank. The sedimentation chamber is connected to the negative pressure reaction chamber through a central tube. A microfiltration membrane is provided at the top of the central tube, and the bottom of the central tube extends to the middle of the sedimentation chamber. A reflection mechanism is provided at the bottom of the central tube. A sludge hopper is provided at the bottom of the second reaction tank. The sedimentation chamber has a weir fixed to its inner wall. The weir is positioned higher than the reflection mechanism. The weir has an outlet on its side wall, which is connected to a water outlet pipe.

2. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 1, characterized in that, The reflection mechanism includes: The connecting part is composed of several connecting plates, which are radially fixed to the bottom end of the central tube; A reflector plate is fixed to the end of the connecting plate away from the central tube.

3. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 1, characterized in that, A motor housing is provided on one side of the first reaction tank, and a slag discharge chamber is provided between the motor housing and the first reaction tank. A slag removal mechanism is provided at the top of the negative pressure reaction chamber of the first reaction tank.

4. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 3, characterized in that, The slag removal mechanism includes: A filter tank, the upper surface of which is fixed to the top of the negative pressure reaction chamber, has a leakage hole on the inner wall of the filter tank, and the side wall of the filter tank is connected to the liquid inlet pipe. The slag discharge section has one end located inside the filter tank and the other end passing through the inner wall of the filter tank, the first reaction tank, the slag discharge chamber, and into the motor housing. The outer surface of the slag discharge section located in the filter tank, the first reaction tank, and the slag discharge chamber is provided with threads, and the slag discharge section is rotatably connected to the inner wall of the filter tank, the first reaction tank, and the slag discharge chamber.

5. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 4, characterized in that, A leak-proof pipe is provided between the slag discharge chamber and the filter tank. The leak-proof pipe is sleeved on the outer side of the slag discharge section and is rotatably connected to the slag discharge section.

6. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 3, characterized in that, The motor housing contains a drive motor, the output end of which is equipped with a first bevel gear. The motor housing also contains a motor frame for supporting the drive motor.

7. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 5, characterized in that, The end of the slag discharge section located inside the motor housing is equipped with a second bevel gear, which meshes with the first bevel gear.

8. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 3, characterized in that, The bottom of the slag discharge chamber is V-shaped, and the bottom of the slag discharge chamber is connected to a slag discharge pipe, which is connected to the bottom of the sludge hopper of the second reaction tank.

9. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 4, characterized in that, A cleaning mechanism is also provided, which is located above the filter tank, and the cleaning mechanism includes: A cleaning pipe is fixedly connected to the top of the negative pressure reaction chamber; Nozzles are evenly distributed on the sides of the cleaning pipe; One end of the cleaning pipe passes through the inner wall of the negative pressure reaction chamber to the outer side of the first reaction tank and is connected to the water supply tank. A water supply pump is installed on the outer side of the cleaning pipe.

10. The waste oil high-efficiency microfiltration negative pressure flocculation sedimentation device according to claim 3, characterized in that, Support columns are provided on the lower surfaces of the first reaction tank and the motor housing.

Images