Storage container special for waste grease

Abstract

The invention relates to the technical field of kitchen wastewater treatment, and discloses a special waste grease storage container which comprises a storage box, an oil-water separation box and a solid-liquid separation mechanism mounted in the oil-water separation box, the oil-water separation box is connected to one side of the storage box; an oil-water separation mechanism is further arranged in the oil-water separation tank, the oil-water separation mechanism comprises a hydrophilic and oleophobic water filtering film, a mounting frame for mounting the water filtering film and a floating ball fixedly connected to the bottom of the mounting frame, and the mounting frame is in sliding sealing contact with the inner wall of the oil-water separation tank; an oil passing opening is formed between the connecting walls of the oil-water separation box and the storage box, and an oleophylic and hydrophobic oil filtering film is arranged in the oil passing opening; a drain pipe is arranged on the outer wall of the lower part of the oil-water separation tank; a liquid level sensor is mounted on the oil-water separation tank; a condenser for cooling the interior of the storage box is mounted in one side wall, far away from the oil-water separation box, of the storage box. The problem that animal oil and vegetable oil in waste oil are still mixed together after oil-water separation is conducted through an existing storage container is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of kitchen wastewater treatment, and in particular relates to a special storage container for waste grease. Background Art

[0002] The treatment of waste cooking oil is an important topic in the field of environmental protection and resource recycling. Waste cooking oil contains a large amount of animal oil and vegetable oil. If these oils are not effectively separated, it will be difficult to realize the resource utilization of waste oil, and it will also cause pollution to the environment.

[0003] Existing grease storage containers usually only have two steps: solid-liquid separation and oil-water separation. Solid-liquid separation is to separate solid impurities from liquid grease in waste cooking oil, while oil-water separation is to separate grease from water. In the subsequent production and reuse of waste oil, animal oil and vegetable oil need to be separated; after the existing oil-water separation, animal oil and vegetable oil in waste oil are still mixed together, resulting in low waste oil treatment efficiency and resource utilization level.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0005] The purpose of the present invention is to provide a special storage container for waste oil, which solves the problem that after oil-water separation in existing storage containers, animal oil and vegetable oil in waste oil are still mixed together, resulting in low waste oil treatment efficiency and resource utilization level.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A special storage container for waste grease, comprising a storage box, an oil-water separation box and a solid-liquid separation mechanism installed in the oil-water separation box; the oil-water separation box is connected to one side of the storage box; the solid-liquid separation mechanism is installed at the box opening of the oil-water separation box, and the oil-water separation mechanism is also provided in the oil-water separation box, the oil-water separation mechanism comprises a hydrophilic and oleophobic water filter membrane, a mounting frame for mounting the water filter membrane and a float fixedly connected to the bottom of the mounting frame, the mounting frame is in sliding sealing contact with the inner wall of the oil-water separation box; an oil passage is provided between the connecting wall of the oil-water separation box and the storage box, and an oleophilic and hydrophobic oil filter membrane is provided in the oil passage; a drain pipe is provided on the lower outer wall of the oil-water separation box, a solenoid valve is provided in the drain pipe, and a liquid level sensor is installed in the oil-water separation box; a condenser for cooling the storage box is installed in a side wall of the storage box away from the oil-water separation box; a first box cover is provided on the storage box, and a second box cover is provided on the oil-water separation box.

[0008] Furthermore, a lifting plate is provided at the inner bottom of the storage box, a lifting rod is provided at the top of the lifting plate, and the lifting plate is in sliding contact with the inner wall of the storage box. The animal oil solidifies at low temperatures, and when the animal oil needs to be transferred, the lifting plate can be directly lifted upward to take the animal oil out of the storage box.

[0009] Furthermore, the installation frame is also provided with a support net, and the support net is located below the water filter membrane; a limit slide groove is formed on the inner wall of the oil-water separation box, and a limit slider matched with the limit slide groove is provided on the outer side of the installation frame. The limit slider and the limit slide groove can keep the installation frame stable when moving.

[0010] Furthermore, the solid-liquid separation mechanism includes a centrifugal cylinder, a rotating disk carrying the centrifugal cylinder, and a driving assembly driving the rotating disk to rotate; a plurality of first filter holes are formed on the side wall and the bottom wall of the centrifugal cylinder; an annular mounting wall is formed at the box opening of the oil-water separation box, a rotating cavity for mounting the rotating disk is formed on the mounting wall, and the longitudinal section of the rotating cavity is "L" shaped, the rotating disk has a limiting ring in the rotating cavity and a bearing plate extending to the outside of the mounting wall, and the centrifugal cylinder is mounted on the bearing plate. The centrifugal cylinder is driven to rotate by the driving assembly, so that oil and water can be quickly separated from food residues, thereby improving the efficiency of solid-liquid separation.

[0011] Furthermore, the driving assembly includes a driving wheel, two extrusion wheels, a driving motor, a first pulley, a second pulley and a synchronous belt; the driving wheel and the two extrusion wheels are distributed at 120° respectively, and the driving wheel and the two extrusion wheels are in friction contact with the limiting ring of the rotating disk; the first pulley is coaxially fixedly connected with the driving wheel, and a mounting shell for mounting the second pulley is provided on the outer wall of the oil-water separation box, the driving motor is fixedly mounted on the bottom of the mounting shell, the second pulley is rotatably mounted in the mounting shell, and the output shaft of the driving motor is drivingly connected to the second pulley; the synchronous belt is sleeved on the first pulley and the second pulley.

[0012] Furthermore, the second box cover is provided with a spray plate, and the spray plate is provided with a plurality of spray nozzles facing the centrifugal cylinder; the top of the second box cover is provided with a water inlet hose connected to the spray plate. By spraying inside the centrifugal cylinder, grease on the surface of the residue can be washed off more quickly during centrifugal separation.

[0013] Furthermore, the solid-liquid separation mechanism also includes a protective cylinder sleeved on the outside of the centrifugal cylinder; the upper part of the protective cylinder is cylindrical, the lower part is an inverted cone, and the bottom of the protective cylinder is also formed with a plurality of second filter holes; the outer edge of the protective cylinder is connected to the extension of the centrifugal cylinder by screws; the bottom surface of the extension of the protective cylinder is formed with a plurality of plug-in strips, and the supporting plate is formed with plug-in grooves that cooperate with the plug-in strips. The protective cylinder can be used to avoid the separated oil and water from being collected and discharged to the bottom during centrifugal separation, so as to avoid the oil and water from splashing on the inner wall of the oil-water separation box.

[0014] Furthermore, a guide plate is provided on the inner wall of the oil-water separation box, and a gap for waste liquid to pass through is provided between the end surface of the guide plate away from the storage box and the inner wall of the oil-water separation box away from the storage box; the height of the guide plate is higher than the height of the oil-passing port; and the liquid level sensor is arranged at the bottom of the guide plate. The guide plate can be used to allow the separated oil and water to flow from one side into the oil and water at the bottom, so as to minimize the re-mixing of the oil and water that have been stratified at the bottom.

[0015] After adopting the above structure, the special storage container for waste oil involved in the present invention, compared with the prior art, first separates food residues from oil and water through a solid-liquid separation mechanism, and then separates oil and water through an oil-water separation mechanism. The separated waste oil enters a storage box, and a condenser is provided on one side of the storage box to preserve the waste oil in the storage box at low temperature. When the waste oil is in a low temperature state, the animal oil will solidify and settle, and the vegetable oil will float, thereby realizing the separation of vegetable oil and animal oil, and the oil can be prevented from deteriorating in a low temperature state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 A cross-sectional schematic diagram of

[0019] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0020] Figure 4 for Figure 2 A schematic diagram of the local enlarged structure at B in the middle;

[0021] Figure 5 It is a structural schematic diagram of the oil-water separation mechanism in the present invention;

[0022] Figure 6 for Figure 5A schematic diagram of the structure from another angle;

[0023] Figure 7 A schematic diagram of the structure of the solid-liquid separation mechanism of the present invention;

[0024] Figure 8 for Figure 7 Schematic diagram of the decomposition of

[0025] Fig. 9 It is a schematic diagram of the structure of the protective tube in the present invention;

[0026] Fig.10 It is a structural schematic diagram of the rotating disk in the present invention;

[0027] Fig.11 It is a schematic structural diagram of the second box cover in the present invention.

[0028] The main component symbols are as follows: storage box 1, first box cover 11, oil-water separation box 2, oil outlet 21, drain pipe 22, second box cover 23, spray plate 231, spray nozzle 2311, water inlet hose 232, installation wall 24, rotating chamber 241, installation shell 25, limiting slide 26, guide plate 27, solid-liquid separation mechanism 3, centrifugal cylinder 31, first filter hole 311, rotating disk 32, limiting ring 321, bearing plate 322, plug slot 322 1. Drive assembly 33, drive wheel 331, extrusion wheel 332, drive motor 333, first pulley 334, second pulley 335, synchronous belt 336, protective cylinder 34, second filter hole 341, plug strip 342, screw 35, oil-water separation mechanism 4, water filter membrane 41, installation frame 42, support net 421, limit slider 422, float 43, oil filter membrane 5, solenoid valve 6, liquid level sensor 7, condenser 8, lifting plate 9, lifting rod 91. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions of the specification, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "back", etc., are only referenced to the directions of the drawings and are not used to limit the scope of protection of the present invention.

[0030] like Figures 1 to 11As shown, the waste grease storage container of the present invention comprises a storage box 1, an oil-water separation box 2 and a solid-liquid separation mechanism 3 installed in the oil-water separation box 2; the storage box 1 is provided with a first box cover 11, the oil-water separation box 2 is provided with a second box cover 23, the volume of the oil-water separation box 2 is smaller than the volume of the storage box 1, the volume of the storage box 1 can be 4-5 times the volume of the oil-water separation box 2, the oil-water separation box 2 is integrated with the storage box 1, and the oil-water separation box 2 is connected to one side of the storage box 1; the solid-liquid separation mechanism 3 is installed at the box opening of the oil-water separation box 2, and the oil-water separation box 2 is also provided with an oil-water separation mechanism 4, the oil-water separation The mechanism 4 includes a hydrophilic and oleophobic water filter membrane 41, a mounting frame 42 for mounting the water filter membrane 41, and a floating ball 43 fixedly connected to the bottom of the mounting frame 42, the mounting frame 42 is in sliding and sealing contact with the inner wall of the oil-water separation box 2; an oil through port 21 is provided between the connecting wall of the oil-water separation box 2 and the storage box 1, and an oleophilic and hydrophobic oil filter membrane 5 is provided in the oil through port 21; specifically, the water filter membrane 41 is a PVDF membrane, which can allow water molecules to pass through while preventing the penetration of oil molecules, and the oil removal rate can reach more than 99%, and the oil filter membrane 5 is a super-hydrophobic and super-oleophilic mesh membrane, which only allows oil molecules to pass through, but water molecules cannot pass through; entering the oil-water separation box 2 Under the action of the water filter membrane 41, the oil and water in the oil-water separator 2 seep downward, isolating the grease above the water filter membrane 41. As the water below the water filter membrane 41 increases, the float 43 is used to push the mounting frame 42 upward, thereby pushing the separated waste oil upward. When the liquid level of the waste oil reaches the oil port 21, the waste oil can enter the storage box 1 from the oil port 21. At this time, under the action of the oil filter membrane 5, water can be prevented from entering the storage box 1 along with the waste oil. In addition, a drain pipe 22 is provided on the lower outer wall of the oil-water separator 2. The drain pipe 22 is located below the oil-water separator 4. A solenoid valve 6 is provided in the drain pipe 22. The separation box 2 is equipped with a liquid level sensor 7; when the liquid level sensor 7 detects that the liquid level reaches a certain height, the solenoid valve 6 can be controlled to open to discharge water from the drain pipe 22; a condenser 8 for cooling the storage box 1 is installed in the side wall of the storage box 1 away from the oil-water separation box 2, and the waste oil entering the storage box 1 is cooled by the condenser 8. Since animal oil usually has a higher melting point and vegetable oil has a lower melting point, the animal oil will solidify under low temperature conditions. Since the density of animal oil is usually greater than that of vegetable oil, the solidified animal oil will settle to the bottom, thereby realizing the separation of animal oil and vegetable oil. In addition, the temperature in the storage box 1 should be controlled at 5°C-10°C to achieve low-temperature refrigeration of oil and fat, and to ensure that the animal oil solidifies and the vegetable oil does not solidify.

[0031] Preferably, a lifting plate 9 is provided at the inner bottom of the storage box 1, and a lifting rod 91 is provided at the top of the lifting plate 9, and the lifting plate 9 is in sliding contact with the inner wall of the storage box 1. Animal oil solidifies at low temperatures, while vegetable oil remains in liquid form. When waste oil needs to be transferred, the vegetable oil can be first extracted through a pipeline, and then the lifting plate 9 can be directly lifted upward to remove the animal oil from the storage box 1.

[0032] In order to increase the supporting force of the installation frame 42 on the water filter membrane 41, a support net 421 is also provided on the installation frame 42, and the support net 421 is located below the water filter membrane 41; in addition, in order to make the installation frame 42 more stable when moving up and down, a limiting groove 26 is formed on the inner wall of the oil-water separation box 2, and a limiting slider 422 cooperating with the limiting groove 26 is provided on the outer side of the installation frame 42.

[0033] In this embodiment, the solid-liquid separation mechanism 3 includes a centrifugal cylinder 31, a rotating disk 32 carrying the centrifugal cylinder 31, and a driving assembly 33 for driving the rotating disk 32 to rotate; a plurality of first filter holes 311 are formed on the side wall and the bottom wall of the centrifugal cylinder 31; an annular mounting wall 24 is formed at the box opening of the oil-water separation box 2, and a rotating cavity 241 for mounting the rotating disk 32 is formed on the mounting wall 24, and the longitudinal section of the rotating cavity 241 is "L"-shaped, and the rotating disk 32 has a limiting ring 321 in the rotating cavity 241 and a supporting plate 322 extending to the outside of the mounting wall 24, and the centrifugal cylinder 31 is mounted on the supporting plate 322. The driving assembly 33 includes a driving wheel 331, two extrusion wheels 332, a driving motor 333, a first pulley 334, a second pulley 335 and a synchronous belt 336; the driving wheel 331 and the two extrusion wheels 332 are respectively distributed at 120°, and the driving wheel 331 and the two extrusion wheels 332 are in friction contact with the limit ring 321 of the uniform rotating disk 32; the first pulley 334 is coaxially fixedly connected with the driving wheel 331, and a mounting shell 25 for mounting the second pulley 335 is provided on the outer side wall of the oil-water separation box 2, the driving motor 333 is fixedly mounted on the bottom of the mounting shell 25, the second pulley 335 is rotatably mounted in the mounting shell 25, and the output shaft of the driving motor 333 is transmission-connected to the second pulley 335; the synchronous belt 336 is sleeved on the first pulley 334 and the second pulley 335. Specifically, a rubber layer is attached to the circumferential surface of the driving wheel 331 and the extruding wheel 332, which can increase the friction coefficient with the rotating disk 32. When in use, the driving wheel 331 is driven to rotate by a motor, and the rotating disk 32 can be driven to rotate with the cooperation of the extruding wheel 332, thereby driving the centrifugal cylinder 31 to rotate quickly, and the oil and water attached to the residue are quickly thrown out, thereby realizing solid-liquid separation.

[0034] In order to more quickly wash away the grease on the surface of the residue, a spray plate 231 is provided on the second box cover 23, and a plurality of spray nozzles 2311 facing the centrifugal cylinder 31 are provided on the spray plate 231; a water inlet hose 232 connected to the spray plate 231 is provided on the top of the second box cover 23, and a water pump is installed at the other end of the water inlet hose 232. In addition, flushing can increase the water content, so that the water entering the oil-water separation box 2 is greater than the oil, so that it is easier for the float 43 to push the installation frame 42 upward, so that the waste oil enters the storage box 1 from the oil port 21 faster.

[0035] In addition, in order to prevent the oil and water thrown out of the centrifugal cylinder 31 from splashing onto the inner wall, the solid-liquid separation mechanism 3 also includes a protective cylinder 34 sleeved on the outside of the centrifugal cylinder 31; the upper part of the protective cylinder 34 is cylindrical, and the lower part is an inverted cone. The bottom of the protective cylinder 34 is also formed with a plurality of second filter holes 341, and the aperture of the second filter hole 341 is smaller than the aperture of the first filter hole 311, which can further filter and prevent food residues from entering the oil-water separation box 2; the outer edge of the protective cylinder 34 is connected to the extension of the centrifugal cylinder 31 by screws 35; the bottom surface of the extension of the protective cylinder 34 is formed with a plurality of plug-in strips 342, and the bearing plate 322 is formed with plug-in grooves 3221 that cooperate with the plug-in strips 342. The protective cylinder 34 can be used to prevent the separated oil and water from being gathered and discharged to the bottom during centrifugal separation. The protective cylinder 34 is plugged into the carrying plate 322, so that the entire centrifugal cylinder 31 can be removed to dump the separated residue. The protective cylinder 34 is connected to the centrifugal cylinder 31 by screws 35, which is also convenient for disassembly and cleaning.

[0036] Since the liquid flow rate after being flushed and then converging through the protective tube 34 is relatively large during solid-liquid separation, a guide plate 27 is provided on the inner wall of the oil-water separation box 2. The three end faces of the guide plate 27 are connected to the three inner walls of the oil-water separation box 2. There is a gap for waste liquid to pass between the end face of the guide plate 27 away from the storage box 1 and the inner wall of the oil-water separation box 2 away from the storage box 1. The height of the guide plate 27 is higher than the height of the oil port 21. The liquid level sensor 7 is arranged at the bottom of the guide plate 27. The guide plate 27 can be used to make the separated oil and water merge from one side into the oil and water at the bottom, avoiding direct impact on the separated waste oil, resulting in a large amount of oil and water mixing again.

[0037] In this embodiment, the guide plate 27, the oil-water separation box 2 and the inner wall of the storage box 1 are sprayed with a hydrophobic and oleophobic coating, which can prevent grease and water from adhering to them and improve the self-cleaning effect.

[0038] The method of using the present invention is as follows: first, the solid-liquid separation mechanism 3 is used to separate the oil and water in the food residue. When performing solid-liquid separation, the spray plate 231 is used to rinse the residue to quickly rinse the oil and increase the ratio of water in the oil and water. The oil and water entering the oil-water separation box 2 are first filtered through the filter water membrane 41 to make more and more water under the filter water membrane 41. Under the action of the float 43, the installation frame 42 is pushed upward, thereby pushing the grease upward until the grease level reaches the height of the oil port 21. The grease enters the storage box 1 from the oil port 21, and the condenser 8 is used to keep the temperature of the storage box 1 between 5-10°C, so that the animal oil can be quickly solidified and settled at the bottom, thereby realizing the separation of animal oil and vegetable oil.

[0039] The above is a detailed introduction to the special storage container for waste grease provided by the present invention. The description of the specific embodiment is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A special storage container for waste grease, characterized by: The invention comprises a storage box (1), an oil-water separation box (2), and a solid-liquid separation mechanism (3) installed in the oil-water separation box (2); the oil-water separation box (2) is connected to one side of the storage box (1); the solid-liquid separation mechanism (3) is installed at the box opening of the oil-water separation box (2); the oil-water separation box (1) is also provided with an oil-water separation mechanism (4); the oil-water separation mechanism (4) comprises a hydrophilic and oleophobic water filter membrane (41), a mounting frame (42) for mounting the water filter membrane (41), and a floating ball (43) fixedly connected to the bottom of the mounting frame (42); the mounting frame (42) is in sliding sealing contact with the inner wall of the oil-water separation box (2). An oil passage (21) is provided between the connecting wall of the oil-water separation box (2) and the storage box (1), and an oleophilic and hydrophobic oil filter membrane (5) is provided in the oil passage (21); a drain pipe (22) is provided on the lower outer wall of the oil-water separation box (2), and a solenoid valve (6) is provided in the drain pipe (22); a liquid level sensor (7) is installed in the oil-water separation box (2); a condenser (8) for cooling the storage box (1) is installed in a side wall of the storage box (1) away from the oil-water separation box (2); a first box cover (11) is provided on the storage box (1), and a second box cover (23) is provided on the oil-water separation box (2).

2. The waste grease storage container according to claim 1, characterized in that: The inner bottom of the storage box (1) is provided with a lifting plate (9), the top of the lifting plate (9) is provided with a lifting rod (91), and the lifting plate (9) is in sliding contact with the inner wall of the storage box (1).

3. The waste grease storage container according to claim 2, characterized in that: The installation frame (42) is also provided with a support net (421), and the support net (421) is located below the water filter membrane (41); a limit slide groove (26) is formed on the inner wall of the oil-water separation box (2), and a limit slide block (422) cooperating with the limit slide groove (26) is provided on the outer side of the installation frame (42).

4. The waste grease storage container according to claim 1, characterized in that: The solid-liquid separation mechanism (3) comprises a centrifugal cylinder (31), a rotating disk (32) carrying the centrifugal cylinder (31), and a driving assembly (33) driving the rotating disk (32) to rotate; a plurality of first filter holes (311) are formed on the side wall and the bottom wall of the centrifugal cylinder (31); an annular mounting wall (24) is formed at the box opening of the oil-water separation box (2); a rotating cavity (241) for mounting the rotating disk (32) is formed on the mounting wall (24); the longitudinal section of the rotating cavity (241) is "L"-shaped; the rotating disk (32) has a limiting ring (321) in the rotating cavity (241) and a bearing plate (322) extending to the outside of the mounting wall (24); the centrifugal cylinder (31) is mounted on the bearing plate (322).

5. The waste grease storage container according to claim 4, characterized in that: The driving assembly (33) comprises a driving wheel (331), two extrusion wheels (332), a driving motor (333), a first pulley (334), a second pulley (335) and a synchronous belt (336); the driving wheel (331) and the two extrusion wheels (332) are respectively 120° apart, and the driving wheel (331) and the two extrusion wheels (332) are in frictional contact with the limiting ring (321) of the rotating disk (32); the first pulley (334) and the driving wheel (331) are respectively 120° apart from each other. ) are coaxially fixedly connected, a mounting shell (25) for mounting the second pulley (335) is provided on the outer wall of the oil-water separation box (2), the drive motor (333) is fixedly mounted on the bottom of the mounting shell (25), the second pulley (335) is rotatably mounted in the mounting shell (25), and the output shaft of the drive motor (333) is transmission-connected to the second pulley (335); the synchronous belt (336) is sleeved on the first pulley (334) and the second pulley (335).

6. The waste grease storage container according to claim 4, characterized in that: The second box cover (23) is provided with a spray plate (231), and the spray plate (231) is provided with a plurality of spray nozzles (2311) facing the centrifugal cylinder (31); the top of the second box cover (23) is provided with a water inlet hose (232) connected with the spray plate (231).

7. The waste grease storage container according to claim 6, characterized in that: The solid-liquid separation mechanism (3) also includes a protective cylinder (34) sleeved on the outside of the centrifugal cylinder (31); the upper part of the protective cylinder (34) is cylindrical, and the lower part is inverted conical, and the bottom of the protective cylinder (34) is also formed with a plurality of second filter holes (341); the outer edge of the protective cylinder (34) is connected to the outer extension of the centrifugal cylinder (31) by screws (35); a plurality of plug-in strips (342) are formed on the bottom surface of the outer extension of the protective cylinder (34), and a plug-in groove (3221) that cooperates with the plug-in strip (342) is formed on the supporting plate (322).

8. The waste grease storage container according to claim 7, characterized in that: A guide plate (27) is provided on the inner wall of the oil-water separation box (2); a gap for waste liquid to pass through is provided between an end surface of the guide plate (27) away from the storage box (1) and the inner wall of the oil-water separation box (2) away from the storage box (1); the height of the guide plate (27) is higher than the height of the oil passage port (21); and the liquid level sensor (7) is arranged at the bottom of the guide plate (27).

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