Kitchen sewage treatment device suitable for separating animal oil

Abstract

The utility model discloses a kitchen sewage treatment device suitable for separating animal oil, which comprises a hot separation chamber and a cold trapping chamber, an overflow discharge channel for transferring high-oil-content sewage into the cold trapping chamber is arranged on the hot separation chamber, a backflow channel for conveying liquid residual water into the hot separation chamber is arranged on the cold trapping chamber, a hot air nozzle is arranged on the hot separation chamber, and a water outlet is arranged on the cold trapping chamber. A cold air nozzle and a hot air nozzle are arranged in the cold trapping chamber, the cold air nozzle is connected with a cold air source through a cold air conduit, and the hot air source and the cold air source are two air outlets on a vortex tube. Meanwhile, the two refining steps of water replenishing overflow and condensation separation are added, the functional defects that a conventional oil-water separator is uneven in heating and unclear in separation are overcome, the separation effect on animal oil in kitchen sewage is better, the speed is higher, and the energy consumption of the system is greatly reduced through cold and hot air sources manufactured through the vortex tube.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a kitchen wastewater treatment device suitable for separating animal oil. Background Art

[0002] The oil-water separator in the commercial complex is installed in the basement of the building. Its working principle is to heat the kitchen wastewater with a heater. After the oil and water are separated, the floating oil on the upper layer is pumped out by an oil suction pump. Due to the overly simple structure of the equipment, the oil-water separation effect is not good, and the animal oil cannot be completely separated from the kitchen wastewater. The root cause is that the kitchen wastewater is a solid-liquid mixture, and its physical properties are similar to paste. The animal oil with a solidification temperature as high as 48 °C adheres to the surface of food residues, just like the aggregate in the paste, hindering the heat transfer. During the process of heating and deoiling the kitchen wastewater with the above-mentioned conventional oil-water separator, there is an obvious temperature difference inside the kitchen wastewater. The actual temperature in the place far from the heating component is lower than the ideal oil-water separation temperature. The animal oil in this part of the water body is separated slowly, and there is still unseparated animal oil remaining in the treated kitchen wastewater; while the actual temperature in the place close to the heating component of the oil-water separator is higher than the ideal oil-water separation temperature. In this part of the water body, not only the animal oil will melt due to heat, but also the minced meat and fat in the suspended water will continue to decompose, and the newly generated animal oil continuously replenishes into the water. The oil pumped away by the oil suction pump is only a part of the total amount, and the remaining residual oil still remains in the treated kitchen wastewater; moreover, the treated kitchen wastewater is still a solid-liquid mixture, and the animal oil floating on the upper layer of the water body has a very high viscosity and is easy to recombine with the solid particles in the water body and sink together. There is actually no obvious oil-water interface in the treated kitchen wastewater, and the separated animal oil cannot be completely pumped away. For the above reasons, there must be animal oil residues when using a conventional oil-water separator to treat kitchen wastewater. Discharging the oily sewage will cause the sewer to be blocked, and the property company has to organize personnel to fish for oil regularly, which is both time-consuming and laborious. What's more unfavorable is that it has become an industry development trend for catering enterprises to flock to operate in commercial complexes, and the daily discharge of kitchen wastewater in the building will continue to rise. The market urgently needs a new equipment with good separation effect and fast separation speed for animal oil. Of course, it would be more ideal if the new equipment could also reduce the power consumption for heating. Summary of the Invention

[0003] The purpose of the utility model is to provide a kitchen wastewater treatment device suitable for separating animal oil. This device uses hot air for heating, and at the same time adds two refinement steps of water replenishment and overflow, and condensation separation, overcoming the functional defects of uneven heating and unclear separation of the conventional oil-water separator, having a better and faster separation effect on the animal oil in the kitchen wastewater, and applying the cold and hot air sources generated by the vortex tube to the oil-water separation step, greatly reducing the energy consumption of the system.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] A kitchen waste water treatment device suitable for separating animal oil, the device includes a thermal separation chamber and a cold trapping chamber. The thermal separation chamber is an independent container established for heating the initially discharged sewage. The cold trapping chamber is an independent container established for cooling the high oil-containing sewage. There is an overflow channel on the thermal separation chamber for transferring the high oil-containing sewage into the cold trapping chamber. There is a reflux channel on the cold trapping chamber for conveying the liquid residual water into the thermal separation chamber. There is a hot air nozzle on the thermal separation chamber for heating the initially discharged sewage contained therein. There is a cold air nozzle in the cold trapping chamber for cooling the high oil-containing sewage flowing into it. The hot air nozzle is connected to a hot air source through a hot air duct, and the cold air nozzle is connected to a cold air source through a cold air duct. The hot air source and the cold air source are two air outlets on a vortex tube that is diverting high-pressure air. There is a top water inlet on the thermal separation chamber for adding clear water to it. The top water inlet is connected to a top water pipe for conveying clear water. There is an oil-water separation plate in the cold trapping chamber for separating solid animal oil and liquid residual water. There is an oil removal mechanism on the oil-water separation plate, and the oil removal mechanism is connected to an external oil discharge pipe.

[0006] The further scheme is that the thermal separation chamber is an independent container established for heating and separating the initially discharged sewage. The initially discharged sewage is heated, separated by the hot air sprayed from the hot air nozzle in the thermal separation chamber, and undergoes liquid surface stratification under the action of gravity, forming two parts: oil-free sewage and high oil-containing sewage, where the high oil-containing sewage is located in the upper layer.

[0007] The further scheme is that the number of thermal separation chambers in the kitchen waste water treatment device is one or more. The overall structure of each thermal separation chamber is arranged on an independent weighing device, and the weighing device provides a trigger signal for the operation steps of the kitchen waste water device.

[0008] The further scheme is that the hot air nozzle is a net weight type one-way inflation valve arranged at the bottom of the thermal separation chamber. The net weight type one-way inflation valve includes a valve body, a sealing ring, and a movable part. The sealing ring is arranged between the valve body and the movable part. The movable part is a movable cap arranged on the valve body or a movable ball arranged in the valve body. The net weight type one-way inflation valve is opened by the pressure exerted by the hot air or closed by the pressure exerted by the sewage in the thermal separation chamber.

[0009] The further scheme is that the cold trapping chamber is an independent container established for cooling and separating the high oil-containing sewage. The high oil-containing sewage is cooled by the cold air sprayed from the cold air nozzle in the cold trapping chamber. The liquid animal oil in the high oil-containing sewage solidifies and condenses, and the all-liquid high oil-containing sewage is transformed into a mixture of agglomerated solid animal oil and oil-free liquid residual water.

[0010] Further, the oil-water separation plate is a flat plate or a curved plate for separating solid animal oil and oil-free liquid residual water. The plate surface of the oil-water separation plate is provided with water-permeable holes. The oil-free liquid residual water seeps downward through the water-permeable holes and flows to the return channel to be separated from the solid animal oil remaining on the plate surface. The oil-water separation plate is connected to an external oil discharge pipe, and a cofferdam for preventing the liquid residual water from flowing into the external oil discharge pipe is arranged between the external oil discharge pipe and the plate surface of the oil-water separation plate.

[0011] Further, an oil removal mechanism is arranged on the oil-water separation plate. The oil removal mechanism is a mechanical scraping type oil removal mechanism. The oil removal mechanism has two functions of scraping the solid animal oil on the plate surface of the oil-water separation plate and dredging the water-permeable holes. The mechanical scraping type oil removal mechanism includes a composite scraper closely attached to the plate surface of the oil-water separation plate, a guiding slide rail for guiding the composite scraper to push the oil towards the external oil discharge pipe direction, a traction belt for driving the composite scraper to reciprocate, and a driving motor for driving the traction belt. The guiding slide rail is arranged parallel to the oil-water separation plate. A sliding bearing is arranged on the guiding slide rail. The composite scraper is fixedly connected with the sliding bearing. The traction belt is fixedly clamped with the composite scraper. The side of the composite scraper is a scraping surface for solid animal oil. A hollow air cavity is arranged inside the composite scraper. An air jet opening for blowing through the water-permeable holes downward is arranged on the lower side of the air cavity. The air cavity is externally connected with an air supply hose.

[0012] Further, the cold air jet openings arranged in the cold trapping chamber are zigzag jet openings which are beneficial to increasing the length of the cooling surface.

[0013] Further, a supercharger and a heat exchanger are connected in series on the hot air duct. The supercharger is a linkage type multi-compression chamber supercharger. The compression chamber of the supercharger is of a bellows structure. The bellows structure is driven by a cylinder or a motor to suck air inward or exhaust air outward during the length expansion and contraction process to complete the pressurized delivery of hot air. The heat exchanger is an energy exchange component arranged at the intersection of the top water pipe and the hot air pipe. The heat exchanger includes a flow-through chamber arranged for the hot air flow to pass through. A water-cooled grille with a deflectable angle is arranged inside the flow-through chamber. The water-cooled grille is of a hollow louver structure. Water inlets and outlets extending out of the chamber are arranged at both ends of the water-cooled grille. The hot air flowing out of the hot air source is cooled to 40°C to 60°C by the water-cooled grille and then is pushed into the hot separation chamber by the supercharger.

[0014] Further, a one-way intake valve and a one-way outlet valve are arranged on the compression chamber of the supercharger. The one-way intake valve and the one-way outlet valve are Tesla valves with different installation directions.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] 1. The device changes the heating method of the conventional oil-water separator from using electric heating tubes to using hot air heating. At the same time, two refinement steps of water replenishment overflow and condensation separation are added, overcoming the functional defects of uneven heating and unclear separation in the conventional oil-water separator, and having a better and faster separation effect on animal oil in kitchen waste water.

[0017] 2. The device applies the cold and hot air sources produced by the vortex tube to the oil-water separation step. The compressed air shunted by the vortex tube can be obtained by the air compressor working during the low electricity consumption period, realizing load transfer and achieving the purpose of peak shaving and valley filling, so that electric energy can be reasonably utilized.

[0018] 3. The device presses hot air into the initially discharged sewage. The hot air penetrates the water body from bottom to top, and has a stirring function while heating. All surfaces of the solids in the sewage can come into contact with the hot air, and the animal oil attached to the folds of the solids is easily separated. Moreover, pressing gas into the water reduces the density of the water body, and the buoyancy of the solids floating in the water body decreases, sinking to the bottom of the thermal separation chamber, where they can first come into contact with the hot air at the highest temperature state. The heat distribution in the thermal separation chamber is reasonable, and the temperature of the hot air pressed into the initially discharged sewage only needs to be maintained between 40°C and 60°C, which is much lower than the working temperature of the traditional electric heater, greatly reducing the energy consumption required by the system.

[0019] 4. In the cold trapping chamber, the high oil-containing sewage is dispersed and cooled by the cold air nozzles during the falling process. The zigzag cold air nozzles designed by the device for this process have a longer cooling surface than the traditional straight nozzles, and have a better cooling effect on the high oil-containing sewage, which is beneficial to the solidification and caking of liquid animal oil for separation from the high oil-containing sewage. Description of the Drawings

[0020] The following describes the present utility model in detail with reference to the drawings and embodiments.

[0021] Figure 1 is the overall structure display diagram of the device;

[0022] Figure 2 is the display diagram of the position of the hot air nozzles in the device;

[0023] Figure 3 is the structure display diagram of the cold trapping chamber in the device;

[0024] Figure 4 is the installation structure display diagram of the hot air ducts in the device;

[0025] Figure 5 is the schematic diagram of the structure of the cold air nozzles in the device;

[0026] Figure 6 is the cross-sectional view of the first type of hot air nozzle structure in the device;

[0027] Figure 7 is the cross-sectional view of the second hot air nozzle structure in this device;

[0028] Figure 8 is the installation effect diagram of the first hot air nozzle structure in this device;

[0029] Figure 9 is the installation effect diagram of the first hot air nozzle structure in this device;

[0030] Figure 10 is the external view display diagram of the supercharger symmetric air box type linkage structure in this device;

[0031] Figure 11 is the positional relationship diagram of the heat exchanger installed above the supercharger in this device;

[0032] Figure 12 is the cross-sectional view of the heat exchanger structure in this device;

[0033] Figure 13 is the schematic diagram of the angle adjustment fixing piece structure in this device;

[0034] Figure 14 is the schematic diagram of the installation position of the top water pipe in this device;

[0035] Figure 15 is the schematic diagram of the oil removal mechanism in this device;

[0036] Figure 16 is the working process display diagram of this device.

[0037] Numbers in the attached drawings: 1. Thermal separation chamber; 101. Bottom plate of thermal separation chamber; 2. Cold trapping chamber; 3. Drainage channel; 4. Return channel; 5. Hot air nozzle; 501. Valve body; 502. Sealing ring; 503. Movable part; 504. Snap ring; 505. Screw; 6. Cold air nozzle; 7. Hot air duct; 8. Cold air duct; 9. Vortex tube; 10. Top water pipe; 11. Oil-water separation plate; 1101. Water permeable hole; 1102. Cofferdam; 12. Return valve; 13. External drain pipe; 14. Weight weigher; 15. Composite scraper; 16. Guide slide rail; 1601. Sliding bearing; 17. Traction belt; 18. Driving motor; 19. Air supply hose; 20. Supercharger; 2001. Cylinder; 2002. Compression chamber; 21. Heat exchanger; 2101. Flow-through chamber; 2102. Water-cooled grille; 2103. Extension end; 2104. Extension end base; 22. Tesla valve; 23. Kitchen waste water; 24. Sewage pipe; 25. Air compressor; 26. Air intake exhaust; 27. Electromagnetic directional valve; 28. Angle adjustment fixing piece; 29. Top water valve. Detailed implementation manners

[0038] A kitchen waste water treatment device suitable for separating animal oil, the overall structure is shown in Figure 1 As shown, the kitchen waste water treatment device includes a thermal separation chamber 1 and a cold trapping chamber 2. The thermal separation chamber 1 is an independent container established for heating the initially discharged waste water, and the cold trapping chamber 2 is an independent container established for cooling the high oil-containing waste water. The two containers are arranged in parallel. Among them, the thermal separation chamber 1 is connected to the kitchen drain 23 at the top and the sewage discharge pipe 24 at the bottom. The number of thermal separation chambers 1 in the kitchen waste water treatment device is one or more. The overall structure of each thermal separation chamber is arranged on an independent weighing device 14, and the weighing device 14 provides a trigger signal for the operation steps of the kitchen waste water device. A valve is provided on the sewage discharge pipe 24. After the initially discharged waste water in the thermal separation chamber 1 is processed, the valve is opened to discharge the processed waste water without animal oil into the municipal pipe network. A discharge overflow channel 3 for transferring the high oil-containing waste water into the cold trapping chamber 2 is provided on the thermal separation chamber 1, and a return channel 4 for transporting the liquid residual water into the thermal separation chamber is provided on the cold trapping chamber 2.

[0039] The thermal separation chamber 1 is an independent container established for heating and separating the initially discharged waste water. A hot air nozzle 5 for heating the initially discharged waste water contained therein is provided on the thermal separation chamber 1, as shown in Figure 2 As shown, the initially discharged waste water is heated, separated by the hot air sprayed from the hot air nozzle 5 in the thermal separation chamber 1, and undergoes liquid surface stratification under the action of gravity, forming two parts: oil-free waste water and high oil-containing waste water, where the high oil-containing waste water is located in the upper layer. The hot air nozzle 5 is connected to the hot air source through a hot air duct 7, and a supercharger 20 and a heat exchanger 21 are connected in series on the hot air duct 7.

[0040] A cold air nozzle 6 for cooling the high oil-containing waste water flowing into it is provided in the cold trapping chamber 2, as shown in Figure 3 As shown, the cold air nozzle 6 is connected to the cold air source through a cold air duct 8. The cold trapping chamber 2 is an independent container established for cooling and separating the high oil-containing waste water. The high oil-containing waste water is cooled by the cold air sprayed from the cold air nozzle 6 in the cold trapping chamber 2, and the liquid animal oil in the high oil-containing waste water solidifies and condenses. The all-liquid high oil-containing waste water is transformed into a mixture of lumped solid animal oil and oil-free liquid residual water. An oil-water separation plate 11 for separating the solid animal oil and the liquid residual water is provided in the cold trapping chamber 2. The oil-water separation plate 11 is a flat or curved plate for separating the solid animal oil and the oil-free liquid residual water. Water permeable holes 1101 are provided on the plate surface of the oil-water separation plate 11. The oil-free liquid residual water seeps downward through the water permeable holes 1101 to flow to the return channel 4 to achieve separation from the solid animal oil remaining on the plate surface. The oil-water separation plate 11 is connected to an external oil discharge pipe, and a cofferdam 1102 for blocking the liquid residual water from flowing into the external oil discharge pipe is provided between the external oil discharge pipe and the plate surface of the oil-water separation plate 11.

[0041] The hot air duct 7 is connected to the hot air source, as shown in Figure 4As shown, the cold air duct 8 is connected to a cold air source. The hot air source and the cold air source are two air outlets on a vortex tube 9 that is diverting high-pressure air. The air inlet of the vortex tube 9 is connected to the air connection row 26, and the air connection row 26 is connected to the air compressor 25. The hot air duct 7 is a collection of multiple sections of pipes, which are sequentially connected to the heat exchanger 21, the supercharger 20, and the hot air nozzle 5 starting from the vortex tube 9. Among them, the hot air pipe from the heat exchanger 21 to the supercharger 20 is bent upward to heat the cold trapping chamber 2 and the bottom of the external drain pipe, avoiding the freezing of the liquid residual water in the cold trapping chamber 2 and the adhesion of the solid animal oil in the external drain pipe to the pipe wall and preventing it from being discharged.

[0042] The cold air nozzle 6 provided in the cold trapping chamber 2 is a serrated nozzle that is beneficial to increasing the length of the cooling surface. See Figure 5 As shown, the cold air duct connecting the cold air nozzle 6 is a special-shaped pipe with an enlarged cross-section. This design is beneficial to the stability of the air flow ejected from the cold air nozzle 6.

[0043] The hot air nozzle 5 is a net weight type one-way inflation valve provided on the bottom plate 101 of the thermal separation chamber. See the cross-sectional view in Figure 6 、 Figure 7 As shown, see the external view in Figure 8 、 Figure 9 As shown, the net weight type one-way inflation valve includes a valve body 501, a sealing ring 502, and a movable part 503. The sealing ring 502 is arranged between the valve body 501 and the movable part 503. The movable part 503 is a movable ball arranged in the valve body or a movable cap arranged on the valve body. Figure 6 The movable ball in is restricted by a circlip 504 to prevent it from popping out upward from the valve body 501; Figure 7 The movable cap in is restricted by a screw 505 to prevent it from detaching from the valve body 501. The net weight type one-way inflation valve is opened by the pressure exerted by the hot air or closed by the pressure exerted by the sewage in the thermal separation chamber.

[0044] The supercharger 20 is a linkage multi-compression chamber supercharger. See Figure 10 As shown, the compression chamber 2002 of the supercharger 20 is of a bellows structure. The bellows structure is driven by a cylinder 2001 or a motor to inhale air inward or exhaust air outward during the process of length expansion and contraction, completing the pressurized transportation of the hot air. The cylinder 2001 is provided with pneumatic thrust by the air connection row 26, and the intake sequence is controlled by the electromagnetic reversing valve 27. The compression chamber of the supercharger 20 is provided with a one-way intake valve and a one-way exhaust valve, and the one-way intake valve and the one-way exhaust valve are Tesla valves 22 with different installation directions.

[0045] The heat exchanger 21 is an energy exchange component provided at the intersection of the top water pipe 10 and the hot air pipe 7. See Figure 11 As shown, the heat exchanger 21 includes a flow-through chamber 2101 provided for the hot air flow to pass through. See Figure 12As shown, a water cooling grille 2102 with a deflectable angle is arranged inside the flow chamber, and the water cooling grille 2102 is a hollow shutter structure. Both ends of the water cooling grille 2102 are provided with extension ends 2103 extending out of the flow chamber 2101. The middle of the extension end 2103 is a water inlet or outlet of the heat exchanger. A longitudinal groove is arranged on the outer wall of the extension end 2103. The outside of the extension end 2103 is an extension end base 2104 fixed on the outer shell of the heat exchanger 21. The outer wall of the extension end base 2104 is provided with a longitudinal groove. The angle adjustment fixing plate 28 is embedded between the above two structures. The deflection angle of the water cooling grille 2102 can be manually adjusted by removing the angle adjustment fixing plate 28, thereby controlling the cooling effect of the water cooling grille on the hot air, ensuring that the water cooling grille 2102 first cools the hot air flowing out of the hot air source to 40°C to 60°C before being pushed into the heat separation chamber 1 by the supercharger 20. The deflection angle of the water cooling grille 2102 in the heat exchanger 21 can be fixed by reinstalling the angle adjustment fixing plate 28. The shape of the angle adjustment fixing plate 28 is shown in FIG. Figure 13 shown.

[0046] The heat separation chamber 1 is provided with a top water inlet for adding clean water therein, and the top water inlet is connected to a top water pipe 10 for conveying clean water. The top water pipe 10 includes a plurality of sections, such as Figure 14 As shown, it includes an inlet heat exchanger section and an outlet heat exchanger section. There are two heat exchanger sections shown in the figure, which are used to add clean water to the two heat separation chambers respectively. The purpose of adding clean water is to increase the liquid level in the heat separation chamber so that the upper high-oil-containing sewage overflows to the cold capture chamber 2. After all the high-oil-containing sewage is transferred, what remains in the heat separation chamber is restaurant sewage without animal oil. Discharging the restaurant sewage without animal oil into the municipal pipe network will not cause the risk of blockage.

[0047] The oil-water separation plate 11 is provided with an oil removal mechanism, which is connected to the external oil discharge pipe 13. The oil removal mechanism is a mechanical scraper type oil removal mechanism. Figure 15 As shown, the oil removal mechanism has two functions of scraping off the solid animal oil on the surface of the oil-water separation plate 11 and unblocking the water-permeable holes 1101. The mechanical scraper type oil removal mechanism includes a composite scraper 15 tightly attached to the surface of the oil-water separation plate 11, a guide rail 16 for guiding the composite scraper to push oil toward the direction of the oil discharge pipe, a traction belt 17 for driving the composite scraper to reciprocate, and a drive motor 18 for driving the traction belt. The guide rail 16 is arranged parallel to the oil-water separation plate 11, and a sliding bearing 1601 is provided on the guide rail 16. The composite scraper 15 is fixedly connected to the sliding bearing 1601, and the traction belt 17 is clamped and fixed to the composite scraper 15, and the clamping piece is 1501. The side of the composite scraper 15 is a scraping surface for solid animal oil, and a hollow air cavity is provided inside the composite scraper 15, and a jet nozzle is provided on the lower side of the air cavity for blowing downward through the water-permeable holes, and the air cavity is externally connected to an air supply hose 19.

[0048] In the present utility model, the initially discharged sewage refers to the kitchen sewage containing animal oil and solid food residues that is directly discharged from the kitchen drain into the heat separation chamber. The vortex tube 9 is a mature product that can be purchased on the market. The vortex tube 9 can simultaneously obtain a low-temperature air flow of -40°C and a high-temperature air flow of over 100°C by splitting high-pressure air. The function of the heat exchanger 21 is to reduce the temperature of the high-temperature air flow to 40°C - 60°C, and then it is transported by the supercharger 20 into the heat separation chamber to heat and remove oil from the discharged sewage, avoiding the temperature of the initially discharged sewage being too high or too low during heating. The hot air nozzle 5 is a net-weight type one-way inflation valve provided on the bottom plate 101 of the heat separation chamber. The force of the hot air in the hot air duct 7 pushing up the moving part 503 needs to be greater than the force of the kitchen sewage in the heat separation chamber pressing down the moving part 503 for the net-weight type one-way inflation valve to open. The function of the supercharger 20 is to provide additional power for the opening of the net-weight type one-way inflation valve, making the pressure at the hot air outlet of the vortex tube 9 equivalent to the pressure at the cold air outlet, ensuring the normal operation of the vortex tube 9. The advantage of using the Tesla valve is to simplify the device structure.

[0049] The treatment process of the initially discharged sewage by the kitchen sewage treatment device is automatically controlled by a PLC program. Automatic valves controlled by the PLC are also provided on the reflux channel 4, the top water pipe 10, and the air supply hose 19. The reflux valve 12 is installed on the reflux channel 4, the top water valve 29 is installed on the top water pipe 10, and the electric cut-off valve is installed on the air supply hose 19. The self-weight of the heat separation chamber plus the weight of the water filling the heat separation chamber are input into the PLC in advance as the preset parameters for the sewage treatment work. The steps for this device to treat kitchen sewage are as follows, see Figure 16 :

[0050] First step, the kitchen drain 23 injects the initially discharged sewage into the heat separation chamber 1, and the weight weigher 14 continuously weighs the heat separation chamber 1. When the measured weight reaches 98% - 99% of the preset parameter, the injection into this chamber stops;

[0051] Second step, the supercharger 20 sends hot air at 40°C - 60°C into the heat separation chamber 1 through the hot air nozzle 5 to heat the initially discharged sewage, causing the initially discharged sewage to be stratified into high-oil-content sewage and sewage-free water;

[0052] Third step, the reflux valve 12 on the reflux channel 4 is opened, and the empty heat separation chamber on the right side in the figure is ready to receive the liquid residual water;

[0053] Fourth step, the top water valve 29 on the top water pipe 10 is opened to inject a fixed amount of clean water into the heat separation chamber, and part of the high-oil-content sewage overflows into the cold trap chamber 2;

[0054] Fifth step, the cold air nozzle 6 blows and scatters the falling high-oil-content sewage to cool the high-oil-content sewage, and the high-oil-content sewage is transformed into a mixture of solid animal oil and oil-free liquid residual water;

[0055] Step 6: The oil-free liquid residual water seeps downward through the water-permeable holes 1101 on the oil-water separation plate 11 to separate from the solid animal oil sticking to the surface of the oil-water separation plate 11;

[0056] Step 7: The composite scraper 15 pushes the solid animal oil into the outer drain pipe 13, and during the oil-pushing process, the air jet openings on the composite scraper 15 blow downward to dredge the water-permeable holes 1101;

[0057] Step 8: Repeat the above steps 4 to 7 until the weight values measured by the weight weigher 14 appear the same or similar more than twice, and this cyclic step ends;

[0058] Step 9: The thermal separation chamber discharges the treated oil-free sewage to the municipal pipe network through the sewage discharge pipe 24;

[0059] The above steps describe the working conditions of the left thermal separation chamber in the figure, and the working of the right thermal separation chamber is similar.

[0060] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0061] 5. This device changes the heating of the conventional oil-water separator from using heating tubes to using hot air heating, and at the same time adds two refinement steps of make-up water overflow and condensation separation, overcoming the functional defects of uneven heating and unclear separation of the conventional oil-water separator, and having a better and faster separation effect on animal oil in kitchen waste water;

[0062] 6. This device applies the cold and hot air sources produced by the vortex tube to the oil-water separation step. The compressed air shunted by the vortex tube can be obtained by the air compressor working during the low electricity consumption peak, realizing the rational utilization of electric energy;

[0063] 7. This device presses hot air into the initially discharged sewage. The hot air penetrates the water body from bottom to top, and has a stirring function while heating. All surfaces of the solids in the sewage can contact the hot air, and the animal oil attached to the folds of the solids is easily separated. Moreover, pressing gas into the water reduces the density of the water body, and the buoyancy of the solids floating in the water body decreases, sinking to the bottom of the thermal separation chamber and contacting the hottest hot air first. Due to the reasonable heat distribution in the thermal separation chamber, the temperature of the hot air pressed into the initially discharged sewage is much lower than that of the traditional electric heater, greatly reducing the energy consumption;

[0064] 8. In the cold trapping chamber, the high oil-containing sewage is blown and cooled by the cold air jet openings during the falling process. The zigzag cold air jet openings designed for this process by this device have a longer cooling surface than the traditional linear jet openings, and have a better cooling effect on the high oil-containing sewage, which is beneficial to the separation of solidified lumps of liquid animal oil from the high oil-containing sewage.

Claims

1. A kitchen wastewater treatment device suitable for separating animal oil, characterized in that: The device comprises a heat separation chamber and a cold capture chamber. The heat separation chamber is an independent container set up for heating the primary sewage, and the cold capture chamber is an independent container set up for cooling the highly oily sewage. The heat separation chamber is provided with an overflow channel for transferring the highly oily sewage to the cold capture chamber, and the cold capture chamber is provided with a reflux channel for conveying liquid residual water to the heat separation chamber. The heat separation chamber is provided with a hot air nozzle for heating the primary sewage contained therein, and the cold capture chamber is provided with a cold air nozzle for cooling the highly oily sewage flowing into it. The hot air nozzle is connected to the hot air source through a hot air duct, and the cold air nozzle is connected to the cold air source through a cold air duct. The hot air source and the cold air source are two air outlets on a vortex tube that is diverting high-pressure air. The heat separation chamber is provided with a top water inlet for adding clean water to the interior thereof, and the top water inlet is connected to a top water pipe for conveying clean water. The cold capture chamber is provided with an oil-water separation plate for separating solid animal oil and liquid residual water, and an oil removal mechanism is provided on the oil-water separation plate, and the oil removal mechanism is connected to an external oil discharge pipe.

2. The kitchen wastewater treatment device according to claim 1, characterized in that: The thermal separation chamber is an independent container set up for heating and separating the primary sewage. The primary sewage is heated and separated by the hot air ejected from the hot air nozzle in the thermal separation chamber, and the liquid surface is stratified under the action of gravity to form two parts: oil-free sewage and high-oil-content sewage, of which the high-oil-content sewage is located in the upper layer.

3. The kitchen wastewater treatment device according to claim 1, characterized in that: The number of the heat separation chambers in the food wastewater treatment device is one or more, and the overall structure of each heat separation chamber is arranged on an independent weight scale, and the weight scale provides a trigger signal for the operation steps of the food wastewater treatment device.

4. The kitchen wastewater treatment device according to claim 1, characterized in that: The hot air nozzle is a net weight one-way inflation valve arranged at the bottom of the heat separation chamber. The net weight one-way inflation valve includes a valve body, a sealing ring, and a movable part. The sealing ring is arranged between the valve body and the movable part. The movable part is a movable cap arranged on the valve body or a movable ball arranged in the valve body. The net weight one-way inflation valve is pushed open by the pressure applied by the hot air or closed by the pressure applied by the sewage in the heat separation chamber.

5. The kitchen wastewater treatment device according to claim 1, characterized in that: The cold capture chamber is an independent container set up for cooling and separating the highly oily wastewater. The highly oily wastewater is cooled by the cold air sprayed from the cold air nozzle in the cold capture chamber, and the liquid animal oil in the highly oily wastewater solidifies and condenses, and the fully liquid highly oily wastewater is converted into a mixture of agglomerated solid animal oil and oil-free liquid residual water.

6. The kitchen wastewater treatment device according to claim 1, characterized in that: The oil-water separation plate is a flat plate or a curved plate for separating solid animal oil and oil-free liquid residual water. The plate surface of the oil-water separation plate is provided with water-permeable holes. The oil-free liquid residual water seeps through the water-permeable holes to the reflux channel to be separated from the solid animal oil retained on the plate surface. The oil-water separation plate is connected to an external oil discharge pipe. A cofferdam is provided between the external oil discharge pipe and the plate surface of the oil-water separation plate to prevent the liquid residual water from flowing into the external oil discharge pipe.

7. The kitchen wastewater treatment device according to claim 1, characterized in that: The cold air nozzles arranged in the cold capture chamber are sawtooth-shaped nozzles which are beneficial to increasing the length of the cooling surface.

8. The kitchen wastewater treatment device according to claim 1, characterized in that: The hot air duct is provided with a supercharger and a heat exchanger connected in series. The supercharger is a linked multi-compression chamber supercharger. The compression chamber of the supercharger is a bellows structure. The bellows structure is driven by a cylinder or a motor to achieve inward suction or outward exhaust during the length extension and contraction process, thereby completing the pressurized transportation of hot air. The heat exchanger is an energy exchange component arranged at the intersection of the top water pipe and the hot air pipe. The heat exchanger includes a flow chamber arranged for the hot air flow to pass through, and a water-cooled grille with a deflectable angle is arranged inside the flow chamber.

9. The kitchen wastewater treatment device according to claim 8, characterized in that: The water cooling grille is a hollow shutter structure, and a water inlet and a water outlet extending out of the chamber are arranged at both ends of the water cooling grille. The water cooling grille cools the hot air flowing out of the hot air source to 40°C to 60°C and then pushes the hot air into the heat separation chamber through the supercharger.

10. The kitchen wastewater treatment device according to claim 8, characterized in that: A one-way air inlet valve and a one-way air outlet valve are arranged on the compression chamber of the supercharger, and the one-way air inlet valve and the one-way air outlet valve are Tesla valves with different installation directions.

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