Disclosure of Invention
The invention aims to overcome the defects that waste oil is harmful to human health and causes resource waste and environmental pollution caused by random discharge of restaurant swill in the prior art, and provides an oil-water separation device for kitchen waste, which is used for timely recovering grease in swill, so that the waste oil is avoided, resources can be recovered, and environmental pollution is reduced.
In order to achieve the above object, the present invention provides the following technical solutions:
an intelligent oil-water separator comprises a main box body, wherein a liquid inlet, a sewage outlet and an oil outlet are formed in the main box body, an oil-water separation cavity is formed in the main box body, and the liquid inlet is communicated with the inside of the oil-water separation cavity; an oil separating funnel is arranged in the oil-water separating cavity, and the oil separating funnel is positioned at the upper end of the oil-water separating cavity; the upper end of the oil separating funnel is a funnel oil inlet, and the lower end of the oil separating funnel is a funnel oil outlet; the funnel oil inlet is communicated with the inside of the oil-water separation cavity, and the funnel oil outlet is communicated with the oil outlet through an oil outlet pipe; the oil-water separator is also provided with a driving device which can drive the oil separating funnel to move up and down. According to the intelligent oil-water separator, oil-water mixed liquid enters the oil-water separation cavity to be subjected to oil-water separation, and then an upper oil layer and a lower water layer are obtained. The oil separating funnel moves downwards under the action of the driving device, the oil separating funnel stagnates for a period of time before an oil inlet of the funnel enters a water layer, an upper oil layer enters the oil separating funnel from the oil inlet of the funnel, an oil outlet of the funnel is separated from the water layer through an oil outlet pipe, and finally the oil outlet is discharged out of the intelligent oil-water separator; the process can be repeatedly carried out, when the oil separating funnel is stopped for a period of time, the driving device drives the oil separating funnel to move upwards to the highest point, then drives the oil separating funnel to move downwards again, is stopped for a period of time before the oil inlet of the funnel enters the water layer, and then continues to reciprocate. The oil-water separation device has the advantages of simple structure, small space volume and low cost, and can be directly arranged in a kitchen of a restaurant or a dining room. The swill oil is separated and collected in time and treated, so that the possibility of spoilage of swill oil can be reduced, the oil in swill is changed into valuable, the resource recycling is realized, and the environmental pollution is reduced; meanwhile, the emission of waste grease can be reduced from the source, and the threat of bad merchants to collect 'swill-cooked dirty oil' to the health of people is avoided.
As a preferable scheme of the invention, a circuit control board is arranged on the oil-water separator, the circuit control board comprises a CPU control module, and the CPU control module is connected with the driving device; the oil-water separator is also provided with a power module which is respectively connected with the circuit control board and the driving device; the oil separating funnel is provided with a first probe, and the first probe is connected with the negative electrode of the power supply module; the bottom of the oil-water separation cavity is provided with an anode detection plate, and the anode detection plate is connected with the anode of the power supply; the CPU control module is connected with the first probe. The distance of the first probe from the inlet of the funnel is determined by design parameters. The liquid medium is positioned between the first probe and the positive electrode detection plate to form a closed circuit loop. The positive electrode detection plate is positioned at the bottom water layer, and the first probe can move up and down along with the oil separating funnel to change between the oil layer and the water layer. When the first probe is positioned in the oil layer, the liquid medium between the first probe and the positive electrode detection plate is an oil layer and a water layer, and the electric conductivity of the liquid medium is weak; when the first probe is positioned in the water layer, the liquid medium between the first probe and the positive electrode detection plate is the water layer, and the conductivity of the liquid medium is strong. When the first probe passes through the interface between the water layer and the oil layer, the closed loop current where the first probe is located will have a sudden change. By detecting the magnitude of the closed loop current where the first probe is located, it can be determined that the first probe is located in the water layer or the oil layer. The CPU control module receives the current detection signal of the first probe and adjusts the walking path and the descending height of the oil separating funnel by controlling the driving device according to the current condition. When the first probe is positioned in the initial position, the driving device drives the oil separating funnel to descend, when the first probe enters the water layer, the loop current of a circuit where the first probe is positioned suddenly increases, the CPU control module receives a signal that the first probe enters the water layer, and the driving device controls the oil separating funnel to stop for a period of time and then drive the oil separating funnel to move upwards. When the oil separating funnel moves to the highest point, the oil separating funnel immediately moves downwards to repeat the oil collecting process. The oil-water separator with the structure can also change the connection positions of the first probe and the positive electrode detection plate with the power supply, namely, the first probe is connected with the positive electrode of the power supply module, and meanwhile, the positive electrode detection plate is connected with the negative electrode of the power supply module. The first probe, the positive electrode detection plate, the power module and the liquid medium between the first probe and the positive electrode detection plate form a closed circuit. The intelligent oil-water separation device can automatically detect and control the position of the oil inlet of the hopper in the oil layer, and realize automatic and intelligent oil collection; and the separated oil layer has little water impurity and high quality.
As a preferable scheme of the invention, the oil separating funnel is further provided with a second probe, the second probe is positioned below the first probe, and the connection relation between the second probe and the power module is the same as the connection relation between the first probe and the power module, namely, when the first probe is connected with the negative electrode of the power module, the second probe is connected with the negative electrode of the power module; when the first probe is connected with the positive electrode of the power supply module, the second probe is connected with the positive electrode of the power supply module; the CPU control module comprises a normal oil receiving module and a fine oil receiving module; the normal oil collecting module is connected with the second probe, and the fine oil collecting module is connected with the first probe. The intelligent oil-water separator with the structure can work in two states of the fine oil receiving module and the normal oil receiving module according to the instruction of the CPU control module. When the intelligent oil-water separator is in a normal oil receiving state, the CPU control module is switched to a normal oil receiving module working state, and the current change state of a circuit where the second probe is positioned is detected, so that the movement process of the oil separating funnel is controlled. When the intelligent oil-water separator is in a fine oil receiving state, the CPU control module is switched to a working state of the fine oil receiving module, and detects a current change state of a circuit where the first probe is located, so that a movement process of the oil separating funnel is controlled. The oil receiving state is controlled in a classified mode, the collected grease is less in water impurity, and the oil product is higher.
As a preferable scheme of the invention, a third probe is arranged at the bottom of the oil-water separation cavity, and the third probe is positioned above the positive electrode detection plate; the CPU control module is connected with the third probe; the connection relation between the third probe and the power supply module is the same as the connection relation between the first probe and the power supply module, namely, when the first probe is connected with the negative electrode of the power supply module, the third probe is connected with the negative electrode of the power supply module; when the first probe is connected with the positive electrode of the power supply module, the third probe is connected with the positive electrode of the power supply module; the drain outlet is provided with a drain valve, and the drain valve is connected with the CPU control module. The intelligent oil-water separator with the structure gradually reduces the water layer in the sewage discharging process. When the third probe leaves the water layer (enters the oil layer or the air layer), the current of the circuit where the third probe is positioned is instantaneously reduced, and the drain valve is closed after the CPU receives the detection signal. The oil layer in the oil-water separation cavity can be prevented from entering the sewage drain.
As a preferable scheme of the invention, the driving device is a stepping motor which is arranged on the upper cover of the main box body and is connected with the power supply module; the stepping motor is provided with a bolt, a nut is fixed on the oil separating funnel, and the nut is connected with the bolt in a matching way; the stepping motor can drive the bolt to rotate around the axis of the bolt; the intelligent oil-water separator further comprises a positioning guide device, and the positioning guide device is used for limiting circumferential rotation of the oil separating funnel. The stepping motor is adopted as a driving device, so that the structure is simple, the cost is low, and the use performance is reliable. The oil separating funnel can accurately control the vertical speed through the cooperation of the bolts and the nuts, and can not cause larger oscillation of the liquid level in the oil-water separating cavity, so that the oil-water separating effect is good, and the collected grease and water are less.
Preferably, the positioning guide device comprises a guide rod and a positioning hole, and the guide rod is matched with the positioning hole; the positioning guide device is fixed on the upper cover of the main box body, the positioning hole is formed in the oil separating funnel, and the guide rod penetrates through the positioning hole. The positioning guide device with the structure has the advantages of simple structure, stable oil collection and low equipment cost.
As a preferable scheme of the invention, the guide rods and the positioning holes comprise a plurality of groups, and the guide rods and the positioning holes are uniformly distributed around the oil separating funnel. The above-mentioned plural sets refer to two or more sets. The multiple groups of guide rods and the positioning holes can be used for enabling the funnel to run more stably, the oil separating funnel is not easy to damage, and the service life is longer.
As a preferable scheme of the invention, the intelligent oil-water separator further comprises an oil tank, and the oil outlet is communicated with the inside of the oil tank; the funnel oil outlet is communicated with the inside of the oil tank through the oil outlet pipe. The oil tank is arranged in the oil-water separator, can be used for temporarily storing and collecting grease, is integrated in separation and collection, and is convenient to use, store and transport.
As a preferable scheme of the invention, an oil pump is arranged in the oil tank, and an outlet of the oil pump is communicated with the oil outlet; the CPU control module is connected with a starting switch of the oil pump; the oil pump is positioned at the bottom of the oil tank. And an oil pump is arranged in the oil tank, and the CPU control module starts the oil pump to work according to the instruction to pump out the grease heavy oil tank, so that the equipment is clean.
As a preferable scheme of the invention, a liquid level meter is also arranged in the oil tank, and the liquid level meter is connected with the CPU control module. The CPU control module receives the liquid level detection signal of the liquid level meter and starts or stops the oil pump to work according to the liquid level detection state. Preferably, the liquid level meter comprises an upper liquid level meter and a bottom liquid level meter, wherein the bottom liquid level meter is positioned at the lower end of the oil tank, the upper liquid level meter is positioned at the upper end of the oil tank, and the upper liquid level meter and the bottom liquid level meter are respectively connected with the CPU control module. When the liquid level in the oil tank reaches the upper liquid level timing, the CPU control module starts the oil pump to pump oil, and when the liquid level of the grease is lower than the bottom liquid level timing, the CPU control module stops the oil pump.
As a preferable scheme of the invention, a heat preservation device and/or a heating device are arranged in the oil tank. The heat preservation device can be arranged on the inner wall of the oil tank, and the heating device is arranged in the oil tank. The heat preservation device and/or the heating device can keep the grease in a flowing liquid state, so that the grease can be transported conveniently.
As a preferable scheme of the invention, an overflow cavity is further arranged in the main box body, an oil separation plate is arranged between the overflow cavity and the oil-water separation cavity, and two sides and the bottom of the oil separation plate are seamlessly connected to the inner wall of the main box body; the lower end of the oil separation plate is provided with a water passing channel which is communicated with the overflow cavity and the oil-water separation cavity; an overflow plate and an overflow port are arranged in the overflow cavity; the overflow plate is positioned between the oil separation plate and the overflow port; the overflow port is positioned at the bottom of the overflow cavity; the lower end and two sides of the overflow plate are seamlessly connected with the inner wall of the main box body; the upper end of the overflow plate is lower than the top of the inner wall of the main box body. According to the overflow cavity with the structure, when the liquid height in the oil-water separation cavity is higher than the height of the overflow plate, the water layer flows out of the intelligent oil-water separator from the bottom water passing channel through the upper end of the overflow plate and the overflow port. The overflow cavity can keep the highest height of liquid in the oil-water separation cavity lower than the oil inlet of the funnel at the uppermost end of the oil separating funnel, and the water layer is prevented from entering the oil tank to reduce the quality of grease.
As a preferable scheme of the invention, a buffer device is also arranged in the oil-water separation cavity, and the buffer device comprises a buffer box; the buffer box is arranged on the inner wall of the oil-water separation cavity, and forms a buffer cavity with the inner wall of the oil-water separation cavity, and the buffer cavity is a container with an opening at the upper end; the liquid inlet is communicated with the inside of the buffer cavity; the side of the buffer box is provided with a plurality of liquid channels, and the liquid channels are communicated with the oil-water separation cavity. The buffer tank is arranged in the oil-water separation cavity, so that the influence of liquid flow at the liquid outlet on liquid fluctuation in the oil-water separation cavity can be reduced, and the oil-water separation effect and the oil quality are improved.
As a preferable scheme of the invention, the upper end of the oil-water separation cavity is also provided with a water supplementing port, and the water supplementing port is communicated with the inside of the buffer cavity. The water supplementing port is arranged, so that the liquid temperature and the liquid level height in the oil-water separator can be adjusted on the one hand.
As a preferable scheme of the invention, a secondary oil-water separation device is also arranged in the oil-water separation cavity, and the secondary oil-water separation device comprises a laminar flow plate; the laminar flow plate comprises a plurality of inclined parallel inclined plates, and gaps between the parallel inclined plates form a water outlet channel in the oil-water separation cavity. The secondary oil-water separation device is arranged in the oil-water separation cavity, when the lower water layer passes through the laminar flow plate, a small amount of dispersed grease in the water layer can be further separated from the water layer, and the oil-water separation effect is better.
Compared with the prior art, the invention has the beneficial effects that:
1. the oil-water separation device has the advantages of simple structure, small space volume and low cost, and can be directly arranged in a kitchen of a restaurant or a dining room. The swill oil is separated and collected in time and treated, so that the possibility of spoilage of swill oil can be reduced, the oil in swill is changed into valuable, the resource recycling is realized, and the environmental pollution is reduced; meanwhile, the emission of waste grease can be reduced from the source, and the threat of bad merchants to collect 'swill-cooked dirty oil' to the health of people is avoided.
2. According to the intelligent oil-water separation device, the position of the oil inlet of the funnel in the oil layer can be automatically detected and controlled by arranging the detection probe, and the intelligent oil collection is realized by matching with a CPU control system; and the separated oil layer has little water impurity and high quality.
3. The stepping motor is adopted as a driving device, so that the structure is simple, the cost is low, and the use performance is reliable. The oil separating funnel can accurately control the vertical speed through the cooperation of the bolts and the nuts, and can not cause larger oscillation of the liquid level in the oil-water separating cavity, so that the oil-water separating effect is good, and the collected grease and water are less.
4. The positioning device (the guide rod and the positioning hole) is arranged, so that the oil separating funnel can be prevented from swinging along with the rotation of the nut to cause the liquid in the oil-water separating cavity.
5. The oil tank is arranged in the oil-water separator, can be used for temporarily storing and collecting grease, is integrated in separation and collection, and is convenient to use, store and transport.
6. The heat preservation device and/or the heating device can keep the grease in a flowing liquid state, so that the grease can be transported conveniently.
7. An overflow cavity is arranged in the intelligent oil-water separator, so that the highest liquid height in the oil-water separation cavity can be kept lower than the uppermost funnel oil inlet of the oil separating funnel, and the water layer is prevented from entering the oil tank to reduce the quality of grease.
8. The intelligent oil-water separator is provided with a water supplementing port, so that the liquid temperature and the liquid level height in the oil-water separator can be adjusted on the one hand.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, the intelligent oil-water separator of the embodiment comprises a main tank body 2, and an upper cover 1 is arranged at the upper end of the main tank body 2. As shown in fig. 2 and 3, an oil-water separation chamber 23, an overflow chamber 24 and an oil tank 25 are arranged in the main tank body 2.
The oil-water separation chamber 23 communicates with the liquid inlet 21 of the oil-water separator. As shown in fig. 1 and 2, the liquid inlet 21 includes a plurality of liquid inlets, which are all located on the left side of the main casing 2. The upper end of the oil-water separation cavity 23 is provided with an oil separating funnel 17 and a stepping motor 18. The stepping motor 18 is fixed to the upper cover 1 and connected to a power module installed at the side of the main casing 2. The lower end of the stepping motor 18 is provided with a bolt 27, and the stepping motor 18 can drive the bolt 27 to rotate along the axis of the bolt 27. The oil separating funnel 17 is provided with a nut 31 matched with the bolt 27, and the nut 31 is matched and connected with the bolt 27. The oil separating funnel 17 is provided with a positioning and guiding device. The positioning and guiding device comprises a guiding rod 16 and a positioning hole, and the guiding rod 16 penetrates through the positioning hole and is matched with the positioning hole. The positioning hole is provided on the outer edge of the oil separating funnel 17. The guide rods 17 and the positioning holes comprise four groups, and the four groups of guide rods 16 and the positioning holes are uniformly distributed around the oil separating funnel 17. The guide bar 16 is fixed to the upper cover 1. The stepping motor 18 drives the bolt 27 to rotate, the guide rod 16 and the positioning hole 32 can limit the circumferential movement of the oil separating funnel 17, the nut 31 is fixed at the same time, and when the bolt 27 rotates, the nut 31 moves up and down relative to the bolt 27, and meanwhile, the oil separating funnel 17 is driven to move up and down. The upper end of the oil separating funnel 17 is a funnel oil inlet, and the lower end is a funnel oil outlet; the oil inlet of the funnel is communicated with the oil-water separation cavity 23, and the oil outlet of the funnel is communicated with the inner cavity of the oil tank 25 through the oil outlet pipe 15. The oil separating funnel 17 is provided with a first probe 19 and a second probe 20, and the first probe 19 is positioned above the second probe 20. The distance between the second probe 20 and the first probe 19 and the oil inlet of the oil receiving hopper 17 is determined by design parameters. The first probe 19 and the second probe 20 are connected to the negative electrode of the power supply module, respectively. The bottom of the oil-water separation cavity 23 is provided with a positive electrode detection plate 9 and a third probe 26, and the third probe 26 is positioned above the positive electrode detection plate 9. The third probe 26 is connected to the negative electrode of the power module, and the positive electrode detection plate 9 is connected to the positive electrode of the power module. The bottom of the oil-water separation cavity 23 is provided with a cleaning outlet 5, and the cleaning outlet 5 is provided with a blow-down valve. The side of the oil-water separation cavity 23 is also provided with a circuit control board which is connected with the power module. The circuit control board comprises a CPU control module, wherein the CPU control module is connected with a circuit switch of the stepping motor 18 and is respectively connected with the first probe 19, the second probe 20 and the third probe 26 through an ADC conversion module. The CPU control module can respectively detect the current conditions of the closed circuits of the first probe 19, the second probe 20, the third probe 26 and the positive electrode detection plate 9 according to the detection modes, and control the motion state of the stepping motor 18 and the on-off state of the drain valve of the cleaning outlet 5 according to the detected conditions.
Along the liquid flow direction (from left to right in fig. 3), a buffer tank 3, a buffer plate 4, a first-stage gravel separating plate 6 and a laminar flow plate 7 are sequentially arranged in the oil-water separation cavity 23, and an oil separating funnel 17 is positioned above the laminar flow plate 7. The laminar flow plate 7 comprises a plurality of parallel inclined plates inclined in the direction of the liquid inlet 21. The first-stage gravel separating plate 6 is positioned in the direction of the liquid inlet of the laminar flow plate 7, the bottom and two sides of the first-stage gravel separating plate 6 are respectively and seamlessly connected with the laminar flow plate 7, and the inner channel of the laminar flow plate 7 is communicated with the water outlet of the oil-water separation cavity 23 to form a water outlet and water channel of the oil-water separation cavity 23, so that oil-in-water droplets in the water layer can be further separated. The left side of the first-stage gravel separating plate 6 is provided with a one-way door, so that the inside of the oil-water separation cavity is conveniently cleaned and discharged. The buffer tank 3 is arranged on the inner wall of the oil-water separation cavity 23, forms a buffer cavity with the inner wall of the oil-water separation cavity 23, and is a container with an opening at the upper end. The liquid inlet 21 communicates with the interior of the buffer chamber. As shown in fig. 5, the side surface of the buffer tank 3 is provided with a plurality of liquid passages through which the mixed liquid enters the oil-water separation chamber 23. The oil-water mixed liquid from the buffer tank 3 sequentially passes through the buffer plate 4, the first-stage gravel separating plate 6 and the laminar flow plate 7 in the oil-water separation cavity 23 to be decelerated, settled and layered, and finally a layered upper oil layer and a layered lower water layer are obtained in the oil-water separation cavity 23, and solid sediment is settled at the bottom of the oil-water separation cavity 23.
An oil separation plate 30 is arranged between the oil-water separation cavity 23 and the overflow cavity 24, and the structure of the oil separation plate 30 is shown in fig. 6. The two sides and the bottom of the oil separation plate 30 are seamlessly connected on the inner wall of the main box body 2, and the water outlet end of the laminar flow plate 7 is seamlessly connected with the oil separation plate 30. The lower end of the oil separation plate 30 is provided with a water passing channel, and the water passing channel of the oil separation plate 30 is communicated with the inside of the laminar flow plate 7 to form a water outlet channel of the oil-water separation cavity 23; the water layer at the bottom of the oil-water separation cavity 23 enters the overflow cavity 24 through the internal channel of the laminar flow plate 7 and the water passing channel at the lower end of the oil separation plate 30. An overflow plate 29 and overflow 10 are provided in the overflow chamber 24. The overflow plate 29 is located between the oil separator plate 30 and the overflow port 10. The overflow port 10 is located at the bottom of the overflow chamber 24. The lower end and both sides of the overflow plate 29 are seamlessly connected with the inner wall of the main tank 2. The upper end of the overflow plate 29 is lower than the top of the inner wall of the main casing 2. The height of the space between the upper end of the overflow plate 29 and the top of the inner wall of the main casing 2 is determined according to design requirements. The overflow plate 29 can control the liquid level in the oil-water separation cavity 23. When the liquid level in the oil-water separation cavity 23 is higher than the overflow plate 29, the water layer enters the overflow cavity 24 through the water channel at the bottom of the oil separation plate 30, and then is discharged from the overflow port 10 through the upper end of the overflow plate 29.
The oil tank 25 is internally provided with an oil pump 11, a bottom liquid level meter 12, an upper liquid level meter 13 and a heating rod 28. The oil-well pump 11 is located the bottom of oil tank 25, and bottom level gauge 12 is located the lower extreme of oil tank 25, goes up the upper end of level gauge 13 oil tank 25, and heating rod 28 is fixed on the inner wall of main tank 2 to be located the centre of oil tank 25. An oil outlet 14 is arranged on the main box body 2, and the oil pump 11 is connected with the oil outlet 14 through a pipeline.
As shown in fig. 2, the upper cover 1 is further provided with a water supplementing port 22, and the water supplementing port 22 is communicated with the inside of the buffer tank 3 of the oil-water separation cavity 2.
In the oil-water separator of the present embodiment, in the initial state, the oil separating funnel 17 is located at the uppermost position, as shown in fig. 3. The oil-water mixture liquid to be separated is filled into the oil-water separator through the liquid inlet 21. Meanwhile, the stepping motor 18 drives the bolt 27 to rotate, and the bolt 27 and the nut 31 cooperate to drive the oil separating funnel 17 to move to the lowest point, as shown in fig. 7. The oil-water mixed liquid to be separated enters the buffer tank 3 from the liquid inlet 21 to be decelerated, and the liquid discharged from the buffer tank 3 is decelerated and primarily layered to become an upper oil layer and a lower water layer which slowly move. The liquid of preliminary layering is further slowed down and layered through buffer board 4, and the upper strata oil reservoir moves to the direction of separating funnel 17 through the oily passageway of crossing of buffer board 4 upper end, and the lower floor water layer moves to overflow chamber 24 direction through the water passageway of buffer board 4 lower extreme. The primarily layered liquid slowly moves in the oil-water separation chamber 23 toward the overflow chamber 24 and the oil separating funnel 17, and is further layered, being separated into an upper oil layer and a lower water layer. In the moving process, the solid suspended matters in the liquid gradually settle to the bottom of the oil-water separation cavity 23, and the first-stage gravel separating plate 6 and the laminar flow plate 7 can collect the solid suspended matters, the settling matters and the like at the bottom of the oil-water separation cavity 23, and meanwhile, the solid sediment is reduced to enter the overflow cavity 24 so as to prevent blockage; meanwhile, the dispersed grease in the water layer is further separated through the laminar flow plate, so that the secondary oil-water separation is realized, and the oil-water separation effect is better. When the oil layer in the oil-water separation chamber 23 rises to the oil inlet of the oil separating funnel 17, the oil layer enters the oil separating funnel 17 and is sent to the oil tank 25 through the oil passage 15 by utilizing the liquid level difference. In this process, the CPU control circuit may be in three detection states: (1) When the oil machine is in normal oil collection, the CPU control module detects the current condition of the circuit of the second probe 20. When the second probe 20 enters the water layer, the oil separating funnel 17 moves upward and to the highest point after a dead time (the dead time is determined by design parameters, such as 2 s), and then moves downward again until the second probe 20 enters the water layer, and moves upward after the dead time. Thus, the oil collecting work in the normal oil collecting state is completed. (2) When the oil machine is in fine oil collection, the CPU control module detects the current condition of the circuit of the first probe 19. The working mode of fine oil collection is different from the normal oil collection mode in that the normal oil collection takes the second probe 20 as a detection point, the fine oil collection takes the first probe 19 as a detection point, and the rest working modes and working principles are the same: i.e., the oil separating funnel 17 moves upward and to the highest point after a dead time (the dead time is determined by design parameters such as 2 s) when the first probe 19 enters the water layer, and then moves downward again until the first probe 19 enters the water layer, and moves upward after the dead time. Thus, the oil collecting work in the fine oil collecting state is completed. (3) closing mode: after fine oil recovery, only a small amount of oil layer remains in the oil-water separation chamber 23. The CPU control module switches to a closing mode. In the closing mode, cleaning the oil-water separation cavity 23, and opening a drain valve of the cleaning outlet 5 to clean and drain the oil-water separation cavity 23; at the same time, the CPU control module detects the current condition of the circuit in which the third probe 26 is located. The lower sewage layer and settled solid residues in the oil-water separation cavity 23 are sent out of the oil-water separation cavity 23 through the cleaning outlet 5. When the third probe 26 is detected to leave the water layer (after entering the water layer or the air layer), the CPU control module closes the drain valve of the cleaning outlet 5, so that the oil layer in the oil-water separation cavity 23 can be prevented from being sent out of the oil-water separation cavity 23.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.