Sanitation vehicle with two-stage sewage treatment circulating system

Abstract

The invention relates to a sanitation vehicle with a two-stage sewage treatment circulating system, which comprises a sanitation vehicle body in which a sewage tank and a clear water tank are arranged; the first-stage sewage filtering device is matched with a corresponding low-pressure water pump to be used for pumping out sewage in the sewage tank and centrifugally filtering out large-particle garbage, and the sewage containing the large-particle garbage is re-discharged to the sewage tank and then is discharged outwards; the secondary sewage filtering device is used for permeating and filtering the sewage after the large-particle garbage is filtered out, discharging the filtered clear water to a clear water tank, and discharging the filtered sewage to the primary sewage filtering device for re-filtering; and the backwashing device is used for backwashing the primary sewage filtering device and the secondary sewage filtering device. By means of a step-by-step grading filtering mode, blocking of the sewage filtering device can be slowed down, the backwashing frequency is reduced, the time of single-time ground sweeping is prolonged, the solid-liquid separation efficiency and effect are improved, the sewage treatment capacity is improved, and long-time and efficient operation of a sewage circulating system of the sanitation truck is truly achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sanitation vehicles, and in particular to a sanitation vehicle with a double-stage sewage treatment circulation system. Background Art

[0002] During the cleaning process, the sanitation truck uses clean water to wash the road surface through a high-pressure nozzle, and then sucks the sewage back into the trash can through a suction nozzle. Since the volume of the clean water tank in the whole vehicle is limited, the one-time operation time of adding water is also limited. In order to extend the operation time of the whole vehicle and save water resources and avoid waste of water resources, the sanitation truck is equipped with a corresponding sewage treatment circulation device, and the collected sewage is filtered and treated for continued use, thereby achieving the effect of energy saving and extending the one-time operation time of adding water.

[0003] A sanitation vehicle with a sewage circulation device with the announcement number CN219568705U filters through a double-layer filter device composed of a stainless steel wedge-shaped filter screen, a 10-mesh punching plate, and a 60-mesh double-layer woven net. A sanitation vehicle water circulation system with the announcement number CN116332255A filters through a filter element with 1-7 mm micropores all over the body. Both of the above schemes are osmotic filtration type decontamination. In actual sewage circulation treatment, the filter screen and the filter element are very easy to get blocked, resulting in the inability to operate for a long time, and frequent high-pressure flushing or reverse cleaning is required. In this way, although it can achieve the effect of extending the one-time operation time of adding water and energy saving, the filter screen or filter element can only be flushed after the filtration process is stopped during cleaning, thereby extending the cleaning time, increasing the number of cleanings, and then extending the operation time, and ultimately affecting the normal use of the sanitation vehicle.

[0004] Therefore, a filtration method is designed that uses a gradually graded filtration method, utilizes a first-level filtration device for high-speed centrifugal sewage separation to separate and discharge large particles of garbage, and then uses a second-level filtration device for membrane osmosis filtration to circulate sewage for treatment, thereby slowing down the blockage of the filtration device and reducing the number of cleaning times of the filtration device for one-time water addition operations, thereby extending the time for a single floor cleaning; and the efficiency and effect of solid-liquid separation can be improved, and the sanitation vehicle with a two-stage sewage treatment circulation system that enhances the sewage treatment capacity is the research purpose of the present invention. Summary of the invention

[0005] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a sanitation vehicle with a two-stage sewage treatment circulation system, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is: A sanitation vehicle with a double-stage sewage treatment circulation system, comprising: A sanitation vehicle body, in which a fresh water tank and a sewage tank connected to a sewage suction device for sucking and collecting ground sewage are provided; A primary sewage filtering device, which cooperates with a corresponding low-pressure water pump to pump the sewage in the sewage tank and centrifugally filter out large particulate garbage. After the sewage containing large particulate garbage is re-discharged into the sewage tank; a secondary sewage filtering device, which is used for osmotic filtration of the sewage after filtering out large particulate garbage and discharging the filtered clean water into the fresh water tank, and discharging the filtered sewage to the primary sewage filtering device for re-filtration; A backwashing device, which is used for flushing the primary sewage filtering device and the secondary sewage filtering device to remove the stains adhering to the primary sewage filtering device and the secondary sewage filtering device; The primary sewage filtering device includes a housing, and a corresponding sewage inlet and a sewage overflow port are respectively arranged at the upper and lower sides of the housing, and a corresponding filtered water outlet is arranged in the middle of the bottom side thereof; A filter screen cover is rotatably installed in the housing, and the filtered water outlet extends upward through a corresponding diversion pipe and communicates with the inside of the filter screen cover. The housing and the filter screen cover cooperate to form a corresponding liquid storage area. The high-speed rotating filter screen cover centrifugally retains large particulate garbage in the liquid storage area and discharges it through the sewage overflow port, and small particulate garbage and water body are filtered into the filter screen cover and discharged through the filtered water outlet; A pressure control mechanism is installed in the liquid storage area. After the liquid storage area is filled with liquid and stops, when the filter screen cover rotates at a high speed for sewage filtration, the liquid storage area is inflated and pressurized through the pressure control mechanism; after the sewage filtration is completed and the air is released and the pressure is relieved through the pressure control mechanism, the liquid storage area is filled with liquid again; An auxiliary drainage mechanism includes a siphon tee pipe fixedly connected to the diversion pipe. The siphon section of the siphon tee pipe is externally connected with a corresponding liquid extraction pipe. The liquid extraction pipe is vertically arranged in the filter screen cover. Under the siphon action, the sewage passes through the filter screen cover and then enters the diversion pipe along the liquid extraction pipe and is discharged together.

[0007] The filter screen cover is rotatably installed in the housing through bearing seats at the upper and lower ends and a corresponding high-speed motor. The pressure control mechanism includes an annular airbag arranged in the liquid storage area through the expansion and contraction control of a corresponding booster pump. The annular airbag is connected to the air outlet end of the booster pump through a corresponding air guide pipe, and a corresponding exhaust valve is fixedly installed on the air guide pipe; the annular airbag is inflated and expanded to pressurize the liquid storage area to push the liquid in the liquid storage area to flow into the filter screen cover; the exhaust valve is opened to deflate and contract the annular airbag to relieve the pressure of the liquid storage area.

[0008] The impeller of the booster pump is connected to the output shaft of the high-speed motor through a gear meshing manner and cooperates with a corresponding drive shaft, and a corresponding clutch is installed on the drive shaft connecting the impeller to control the connection between the booster pump and the high-speed motor.

[0009] A circular positioning plate for sealing and installing the annular airbag is fixedly arranged at the top inside the housing. The output shaft of the high-speed motor is rotationally connected to the circular positioning plate and the housing through corresponding bearings, and the upper bearing seat for installing the filter screen cover is fixedly installed on the circular positioning plate, and the lower bearing seat for installing the filter screen cover is fixedly installed inside the housing through a plurality of support rods.

[0010] A number of siphon three-way pipes are connected to the diversion pipe in a staggered manner, and the liquid extraction pipes connected outward by the siphon three-way pipes are arranged evenly along the circumference of the filter screen cover. The liquid extraction pipes are fixedly installed on the lower bearing seat; the liquid extraction pipes are arranged at a certain distance from the filter screen cover, and at least one row of liquid guide holes is arranged on the outer peripheral surface of the liquid extraction pipe from top to bottom, and the liquid guide holes face the adjacent filter screen cover; under the action of siphon, the sewage passes through the filter screen cover and enters the liquid extraction pipe through the liquid guide holes.

[0011] An upper liquid level sensor and a lower liquid level sensor are arranged up and down on the housing in the liquid placement area; when the annular airbag is inflated and pressurized to push the liquid in the liquid placement area to flow into the filter screen cover until the liquid level is lower than the lower liquid level sensor, the booster pump stops supplying gas and the annular airbag deflates and relieves pressure, and then the low-pressure water pump operates to continue filling the housing with sewage; when the sewage in the liquid placement area reaches the upper liquid level sensor, the low-pressure water pump stops operating, and the booster pump and the high-speed motor are connected through a clutch and a speed reducer to inflate the annular airbag through the booster pump to pressurize the liquid placement area.

[0012] The secondary sewage filtering device is a ceramic membrane processor, which is sequentially provided with a support layer, a transition layer and a filtering layer with gradually decreasing pore diameters from outside to inside. A corresponding pressure gauge, a relief valve and a pulse switch are arranged in the ceramic membrane processor; the water outlet of the ceramic membrane processor is connected to a clean water tank through a corresponding flow meter; when the value detected by the flow meter is lower than the set value Q1, the inlet valve connecting the sewage tank and the low-pressure water pump is closed and the backwashing device is started.

[0013] The filtered water outlet of the primary sewage filtering device is connected to the liquid inlet of the ceramic membrane processor through a corresponding drain valve. The sewage outlet of the ceramic membrane processor is connected to the sewage inlet of the primary sewage filtering device through a corresponding reflux valve. And the clean water tank is connected to the low-pressure water pump through a corresponding water outlet valve. The sewage overflow port of the primary sewage filtering device is connected to the sewage tank through a sewage discharge valve. When the primary sewage filtering device is cleaned by the backwashing device, the liquid inlet valve and the drain valve are closed, the water outlet valve and the sewage discharge valve are opened, and the low-pressure water pump is started. The primary sewage filtering device is cleaned with the clean water in the clean water tank. When the primary sewage filtering device and the secondary sewage filtering device are cleaned by the backwashing device, the water outlet valve and the drain valve are opened, the liquid inlet valve and the sewage discharge valve are closed. After the low-pressure water pump runs for a period of time, the sewage discharge valve is opened to flow the flushed sewage back to the sewage tank.

[0014] The backwashing device further includes a gas source connected to the ceramic membrane processor through a corresponding air outlet valve, and a corresponding pulse switch is provided inside the ceramic membrane processor. When the secondary sewage filtering device is cleaned by the backwashing device, the low-pressure water pump and the other valves are closed, and the air outlet valve is opened. After the ceramic membrane processor is inflated by the gas source, the pulse switch provided inside the ceramic membrane processor is opened, and an air explosion is formed by instantaneously releasing the pressure-retained gas, so that the membrane flux of the ceramic membrane processor is restored and the sewage treatment capacity is restored.

[0015] The liquid inlet valve, the drain valve, the water outlet valve, the sewage discharge valve and the air outlet valve are all pneumatically controlled valves. The reflux valve is a throttle valve, and a corresponding throttle valve is also provided between the sewage overflow port of the primary sewage filtering device and the sewage tank.

[0016] Advantages of the present invention: 1) The present invention conducts sewage treatment through a step-by-step hierarchical filtering method. After the large-particle garbage is separated and discharged by the primary sewage filtering device using high-speed centrifugation, secondary treatment is carried out through the membrane penetration filtration of the secondary sewage filtering device. The double hierarchical treatment can effectively slow down the adhesion and blockage of solid garbage to the filtering device, extend the single filtration operation duration after flushing, and thus reduce the cleaning times of the sewage filtering device for a one-time water addition operation. Through targeted cleaning by clean water backwashing and air explosion backwashing, the effect of sewage circulation treatment can be promoted, thereby extending the time of a single ground cleaning, improving the efficiency and effect of solid-liquid separation, enhancing the sewage treatment capacity, and truly realizing the long-term and efficient operation of the sewage circulation system of the sanitation vehicle.

[0017] 2) The invention uses different modes of the flushing device to clean the primary sewage filtering device and the secondary sewage filtering device, thereby ensuring the recycling of sewage treatment, and achieving the effects of energy conservation and extended duration of a single water addition operation. It can not only clean the primary sewage filtering device with the clean water in the clean water tank by closing the liquid inlet valve and the liquid discharge valve, opening the water outlet valve and the sewage discharge valve, and starting the low-pressure water pump; but also clean the primary sewage filtering device and the secondary sewage filtering device by opening the water outlet valve and the liquid discharge valve, closing the liquid inlet valve and the sewage discharge valve, starting the low-pressure water pump to run for a period of time, and then opening the sewage discharge valve to let the flushed sewage flow back to the sewage tank. Additionally, it can close the low-pressure water pump and the other valves, open the air outlet valve, inflate the ceramic membrane processor with the air source, and then open the pulse switch set inside the ceramic membrane processor to form an air explosion by instantaneously releasing the trapped pressure gas, so as to restore the membrane flux of the ceramic membrane processor and its sewage treatment capacity, thereby realizing the cleaning of the ceramic membrane processor.

[0018] 3) In the primary sewage filtering device, a high-speed rotating filter screen cover is used to separate large-particle garbage in the sewage. Although large-particle garbage can be centrifugally separated during the high-speed rotation of the filter screen cover, it will also have the effect of centrifugally throwing out some small-particle sewage, thus increasing the difficulty of preventing small-particle sewage from entering the filter screen cover and being discharged, and further resulting in a large liquid level difference inside and outside the filter screen cover, with a low liquid level inside the filter screen cover and a high liquid level outside. If the material is discharged quickly, it will cause the material inside the filter screen cover to run out, ultimately leading to a low overall filtration efficiency and low effluent filtration rate. Therefore, after the liquid inlet of the primary sewage filtering device is appropriate, the liquid inlet is stopped. On the basis that the sewage overflows and filters into the filter screen cover under the action of gravity, the invention further optimizes and improves the primary sewage filtering device, adding a corresponding pressure control mechanism in the liquid placement area formed by the housing and the filter screen cover, and promoting the filtration of sewage through the dual methods of pressure increase cooperation and centrifugation, reducing the liquid level difference inside and outside the filter screen cover, so as to facilitate the filtration of small-particle garbage and liquid in the sewage, and thereby improve the filtration efficiency and effect.

[0019] 4) The present invention further provides an auxiliary drainage mechanism for promoting filtration and drainage. By installing a corresponding siphon three-way pipe on the diversion pipe, and the siphon section of the siphon three-way pipe is externally connected to a liquid extraction pipe vertically arranged inside the filter screen cover. Under the action of siphon, the sewage inside the filter screen cover is promoted to be pumped into the diversion pipe. The dual cooperation of external pressure boost and internal pumping further promotes and improves the filtration efficiency. Moreover, the liquid extraction pipes are vertically and evenly distributed on the inner side wall of the filter screen cover with a spacing, and corresponding liquid guide ports are arranged on the liquid extraction pipes facing the peripheral surface adjacent to the filter screen cover, and the liquid guide ports face the adjacent filter screen cover. In this way, under the condition of not excessively increasing costs and energy consumption, the extraction pipe can have the effect of pumping the sewage outside the adjacent filter screen cover, thereby promoting the rapid filtration of part of the sewage. Without passing through the inside of the filter screen cover, it is directly diverted into the diversion pipe through the siphon three-way pipe, which can not only promote the water flow and improve the sewage filtration efficiency, but also divert and discharge the sewage to ensure the balance of the liquid levels inside and outside the filter screen cover, and thus greatly improve the liquid discharge efficiency.

[0020] 5) When the primary sewage filtration device of the present invention performs pressurized centrifugal filtration, the expansion and contraction of the annular airbag are used for pressure control. The annular airbag is inflated by driving air intake through a booster pump, and the annular airbag expands to apply pressure to the liquid placement area, thereby promoting the filtration of sewage. Then, the annular airbag is deflated through a pressure relief valve to reduce the pressure. The annular airbag is intermittently inflated and deflated in different states of liquid inlet and filtration to ensure the practical adaptability of the present invention.

[0021] 6) Pressurization treatment is only required when the high-speed motor drives the filter screen cover to rotate at a high speed for filtration. The booster pump of the present invention is connected to the high-speed motor through a corresponding gear meshing method. Without the intervention of other power, the high-speed motor operates and drives the booster pump to operate to inflate the annular airbag, thereby pressurizing the liquid placement area and promoting the filtration efficiency. Then, through the change of the liquid level in the liquid placement area, the liquid inlet and filtration steps are accurately regulated through the upper and lower liquid level sensors, promoting the automatic operation of the primary sewage filtration device.

[0022] 7) The present invention is provided with a corresponding flow meter between the ceramic membrane processor and the clean water tank. When the value on the flow meter is lower than the set value Q1, the liquid inlet valve connecting the sewage tank and the low-pressure water pump is closed and the primary sewage filtration device and the secondary sewage filtration device are flushed through the backwashing device to promote the recycling of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention.

[0024] Figure 2 is a schematic structural diagram of the primary sewage filtration device.

[0025] Figure 3 is Figure 2 a sectional view of

[0026] In the attached drawings: sewage tank 1, clean water tank 2, primary sewage filtering device 3, low-pressure water pump 4, housing 301, sewage inlet 3011, sewage overflow outlet 3012, filtered water outlet 3013, high-speed motor 302, filter screen cover 303, booster pump 304, annular airbag 305, diversion pipe 306, siphon three-way pipe 307, liquid extraction pipe 308, liquid guide hole 3081, clutch 5, upper side liquid level sensor 6, lower side liquid level sensor 7, annular positioning plate 8, flowmeter 9, liquid inlet valve 10, liquid discharge valve 11, return valve 12, water outlet valve 13, air outlet valve 14, sewage discharge valve 15, air source 16, secondary sewage filtering device 17. Specific Embodiments

[0027] For the convenience of those skilled in the art to understand, the embodiments will now be further described in detail in conjunction with the attached drawings for the structure of the present invention: Reference Figures 1-3 , a sanitation vehicle with a double-stage sewage treatment circulation system, comprising: A sanitation vehicle body, in which a clean water tank 2 and a sewage tank 1 connected to a sewage suction device for sucking and collecting ground sewage are arranged; A primary sewage filtering device 3, which cooperates with a corresponding low-pressure water pump 4 to pump the sewage in the sewage tank 1 and centrifugally filter out large particle garbage. After the sewage containing large particle garbage is re-discharged into the sewage tank 1; a secondary sewage filtering device 17, which is used to perform osmotic filtration on the sewage after filtering out large particle garbage and discharge the filtered clean water into the clean water tank 2, and the filtered sewage is discharged to the primary sewage filtering device 3 for re-filtering; A backwashing device, which is used to wash the primary sewage filtering device 3 and the secondary sewage filtering device 17 to remove the stains adhering to the primary sewage filtering device 3 and the secondary sewage filtering device 17; The primary sewage filtering device 3 includes a housing 301, and a corresponding sewage inlet 3011 and a sewage overflow outlet 3012 are respectively arranged on the upper and lower sides of the housing 301, and a corresponding filtered water outlet 3013 is arranged in the middle of the bottom side thereof; A filter screen cover 303 is rotatably installed in the housing 301, and the filtered water outlet 3013 extends upward through a corresponding diversion pipe 306 and communicates with the inside of the filter screen cover 303. The housing 301 and the filter screen cover 303 cooperate to form a corresponding liquid placement area. The high-speed rotating filter screen cover 303 centrifugally retains large particle garbage in the liquid placement area and discharges it through the sewage overflow outlet 3012, and small particle garbage and water body are filtered into the filter screen cover 303 and discharged through the filtered water outlet 3013; The pressure control mechanism is installed in the liquid placement area. After the liquid placement area finishes liquid inlet and stops, when the filter screen cover 303 rotates at a high speed for filtering dirt, the pressure control mechanism inflates and pressurizes the liquid placement area; after the dirt filtering is completed and the pressure is released through the pressure control mechanism, the liquid placement area conducts liquid inlet again; The auxiliary drainage mechanism includes a siphon three-way pipe 307 fixedly connected and installed on the diversion pipe 306. The siphon section of the siphon three-way pipe 307 is externally connected with a corresponding liquid extraction pipe 308. The liquid extraction pipe 308 is vertically arranged in the filter screen cover 303. Under the siphon action, the sewage passes through the filter screen cover 303 and then enters the diversion pipe 306 along the liquid extraction pipe 308 and is discharged together.

[0028] The present invention conducts sewage treatment through a step-by-step hierarchical filtration method. After the large-particle garbage is separated and discharged by high-speed centrifugation using the primary dirt filtration device 3, it is further subjected to secondary treatment by membrane permeation filtration of the secondary dirt filtration device 17. The double hierarchical treatment can effectively slow down the adhesion and blockage of solid garbage to the filtration device, extend the single filtration operation duration after flushing, and thus reduce the cleaning times of the filtration device for one-time water addition operation; through targeted cleaning by reverse flushing with clean water and air explosion flushing, the effect of sewage circulation treatment can be promoted, thereby extending the time of single ground cleaning, and improving the efficiency and effect of solid-liquid separation, enhancing the sewage treatment capacity, and truly realizing the long-time and efficient operation of the sewage circulation system of the sanitation vehicle.

[0029] The filter screen cover 303 is rotationally installed in the housing 301 through the bearing seats at the upper and lower ends and the corresponding high-speed motor 302. The pressure control mechanism includes an annular airbag 305 arranged in the liquid placement area and controlled by a corresponding booster pump 304 for expansion and contraction. The annular airbag 305 is connected to the air outlet end of the booster pump 304 through a corresponding air guide pipe, and an exhaust valve is fixedly installed on the air guide pipe; the annular airbag 305 is inflated to pressurize the liquid placement area to push the liquid in the liquid placement area to flow into the filter screen cover 303; the exhaust valve is opened to deflate and contract the annular airbag 305 for depressurizing the liquid placement area.

[0030] In the first-stage sewage filtering device 3, a high-speed rotating filter screen cover 303 is used to separate large-particle garbage in the sewage. Although large-particle garbage can be centrifugally separated during the high-speed rotation of the filter screen cover 303, it will also have the effect of centrifugally throwing out some small-particle sewage, thus inhibiting the difficulty of small-particle sewage entering the filter screen cover 303 for discharge. As a result, a large liquid level difference is formed inside and outside the filter screen cover 303, with the liquid level inside the filter screen cover 303 being low and the liquid level outside being high. If the material is discharged quickly, it will cause the material in the filter screen cover 303 to be cut off, ultimately resulting in a relatively low filtration efficiency and a low water filtration rate. Therefore, after the liquid inlet of the first-stage sewage filtering device 3 is appropriate, the liquid inlet is stopped. On the basis that the sewage overflows and filters into the filter screen cover 303 under the action of gravity, the present invention further optimizes and improves the first-stage sewage filtering device 3. A corresponding pressure control mechanism is added in the liquid placement area formed by the housing 301 and the filter screen cover 303, and the sewage is pushed to be filtered through a dual mode of supercharging cooperation and centrifugation, reducing the liquid level difference inside and outside the filter screen cover 303, so as to promote the filtration of small-particle garbage and liquid in the sewage, and further improve the filtration efficiency and effect.

[0031] The impeller of the booster pump 304 is connected to the output shaft of the high-speed motor 302 through a gear meshing method and a corresponding drive shaft, and a corresponding clutch 5 is installed on the drive shaft connecting the impeller to control the connection between the booster pump 304 and the high-speed motor 302.

[0032] When the high-speed motor 302 drives the filter screen cover 303 to rotate at a high speed for filtration, supercharging treatment is required. The booster pump 304 of the present invention is connected to the high-speed motor 302 through a corresponding gear meshing method. Without the intervention of other power, the high-speed motor 302 operates and drives the booster pump 304 to operate to inflate the annular airbag 305, thereby pressurizing the liquid placement area and promoting the filtration efficiency. Then, through the change of the liquid level in the liquid placement area, the liquid inlet and filtration steps are accurately regulated by the upper and lower liquid level sensors, promoting the automatic operation of the first-stage sewage filtering device 3.

[0033] A circular positioning plate 8 for sealing and installing the annular airbag 305 is fixedly arranged at the top inside the housing 301. The output shaft of the high-speed motor 302 is rotationally connected to the circular positioning plate 8 and the housing 301 through corresponding bearings, and the upper bearing seat for installing the filter screen cover 303 is fixedly installed on the circular positioning plate 8, and the lower bearing seat for installing the filter screen cover 303 is fixedly installed inside the housing 301 through a plurality of support rods.

[0034] A number of siphon tees 307 are misaligned and connected to the diversion pipe 306, and the liquid extraction pipes 308 connected outwardly by the siphon tees 307 are evenly distributed along the circumference of the filter screen cover 303. The liquid extraction pipes 308 are fixedly installed on the bearing seats at the lower side; the liquid extraction pipes 308 are spaced from the filter screen cover 303, and at least one row of liquid guiding holes 3081 is arranged on the outer peripheral surface of the liquid extraction pipes 308 from top to bottom. The liquid guiding holes 3081 face the adjacent filter screen cover 303; under the action of siphon, the sewage passes through the filter screen cover 303 and enters the liquid extraction pipes 308 through the liquid guiding holes 3081.

[0035] The present invention further adds an auxiliary drainage mechanism for promoting filtration and drainage. By installing corresponding siphon tees 307 on the diversion pipe 306, and the siphon section of the siphon tee 307 is connected outwardly with liquid extraction pipes 308 vertically arranged in the filter screen cover 303. Under the action of siphon, it promotes the sewage in the filter screen cover 303 to be pumped into the diversion pipe 306. The double cooperation of external pressure boosting and internal pumping further promotes and improves the filtration efficiency; furthermore, the liquid extraction pipes 308 are vertically and evenly distributed on the inner side wall of the filter screen cover 303 and are spaced, and corresponding liquid guiding ports are arranged on the outer peripheral surface of the liquid extraction pipes 308 facing the adjacent filter screen cover 303. The liquid guiding ports face the adjacent filter screen cover 303. In this way, without excessive increase in cost and energy consumption, the liquid extraction pipes can have the effect of pumping the sewage outside the adjacent filter screen cover 303, thereby promoting the rapid filtration of part of the sewage. Without passing through the inside of the filter screen cover 303, it is directly diverted into the diversion pipe 306 through the siphon tee 307. This can not only promote the water flow and improve the sewage filtration efficiency, but also divert and discharge the sewage to ensure the liquid level balance inside and outside the filter screen cover 303, thereby greatly improving the liquid discharge efficiency.

[0036] On the housing 301, a corresponding upper liquid level sensor 6 and a lower liquid level sensor 7 are arranged up and down in the liquid placement area; when the annular airbag 305 is inflated and pressurized to push the liquid in the liquid placement area to flow into the filter screen cover 303 until the liquid level is lower than the lower liquid level sensor 7, the booster pump 304 stops supplying air and the annular airbag 305 deflates and relieves pressure, and then the low-pressure water pump 4 operates to continue filling the housing 301 with sewage; when the sewage in the liquid placement area reaches the upper liquid level sensor 6, the low-pressure water pump 4 stops operating, and the booster pump 304 and the high-speed motor 302 are connected through the clutch 5 and the speed reducer to inflate the annular airbag 305 through the booster pump 304 to pressurize the liquid placement area.

[0037] The primary sewage filtering device 3 of the present invention adopts the expansion and contraction of an annular airbag 305 to control the pressure during pressurized centrifugal filtration. The annular airbag 305 is inflated by driving air intake through a booster pump 304. The annular airbag 305 expands to exert pressure on the liquid placement area, thereby promoting the filtration of sewage. Then, the annular airbag 305 is deflated and the pressure is relieved by releasing air through a pressure relief valve. The annular airbag 305 is intermittently inflated and deflated in different states of liquid intake and filtration to ensure the practical adaptability of the present invention, and the upper and lower liquid level sensors are used to conveniently and effectively adjust and control the pressure.

[0038] The secondary sewage filtering device 17 is a ceramic membrane processor, which is sequentially provided with a support layer, a transition layer, and a filtration layer with gradually decreasing pore diameters from outside to inside. A corresponding pressure gauge, unloading valve, and pulse switch are provided in the ceramic membrane processor; the water outlet of the ceramic membrane processor is connected to the clean water tank 2 through a corresponding flowmeter 9; when the value detected by the flowmeter 9 is lower than the set value Q1, the liquid inlet valve 10 connecting the sewage tank 1 and the low-pressure water pump 4 is closed and the backwashing device is started.

[0039] The present invention is provided with a corresponding flowmeter 9 between the ceramic membrane processor and the clean water tank 2. When the value on the flowmeter 9 is lower than the set value Q1, the liquid inlet valve connecting the sewage tank 1 and the low-pressure water pump 4 is closed and the backwashing device is started to wash the primary sewage filtering device 3 and the secondary sewage filtering device 17, so as to promote the recycling of the equipment.

[0040] The filtered water outlet 3013 of the primary sewage filtering device 3 is connected to the liquid inlet of the ceramic membrane processor through a corresponding drain valve 11. The sewage outlet of the ceramic membrane processor is connected to the sewage inlet 3011 of the primary sewage filtering device 3 through a corresponding return valve 12. The clean water tank 2 is connected to the low-pressure water pump 4 through a corresponding water outlet valve 13. The sewage overflow port 3012 of the primary sewage filtering device 3 is connected to the sewage tank 1 through a sewage discharge valve 15; when the primary sewage filtering device 3 is cleaned by the backwashing device, the liquid inlet valve 10 and the drain valve 11 are closed, the water outlet valve 13 and the sewage discharge valve 15 are opened, and the low-pressure water pump 4 is started. The primary sewage filtering device 3 is cleaned with the clean water in the clean water tank 2; when the primary sewage filtering device 3 and the secondary sewage filtering device 17 are cleaned by the backwashing device, the water outlet valve 13 and the drain valve 11 are opened, the liquid inlet valve 10 and the sewage discharge valve 15 are closed. After the low-pressure water pump 4 runs for a period of time, the sewage discharge valve 15 is opened to flow the flushed sewage back to the sewage tank 1.

[0041] The backwashing device further includes a gas source 16 connected to the ceramic membrane processor through a corresponding air outlet valve 14, and a corresponding pulse switch is provided in the ceramic membrane processor; when cleaning is performed through the secondary sewage filtration device 17 of the backwashing device, the low-pressure water pump 4 and the remaining valves are closed, the air outlet valve 14 is opened, after the ceramic membrane processor is inflated through the gas source 16, the pulse switch provided in the ceramic membrane processor is opened, and air explosion is formed by instantaneously releasing the trapped pressure gas, so that the membrane flux of the ceramic membrane processor is restored and the sewage treatment capacity is restored.

[0042] The liquid inlet valve 10, the liquid discharge valve 11, the water outlet valve 13, the sewage discharge valve 15 and the air outlet valve 14 are all pneumatic control valves, the reflux valve 12 is a throttle valve, and a corresponding throttle valve is further provided between the sewage overflow port 3012 of the primary sewage filtration device 3 and the sewage tank 1.

[0043] The invention uses different modes to clean the primary sewage filtration device and the secondary sewage filtration device through the backwashing device, thereby ensuring the recycling of sewage treatment, and thus achieving the effects of energy conservation and extending the duration of a one-time water addition operation. It can not only clean the primary sewage filtration device 3 with the clean water in the clean water tank 2 by closing the liquid inlet valve 10 and the liquid discharge valve 11, opening the water outlet valve 13 and the sewage discharge valve 15 and starting the low-pressure water pump 4; but also clean the primary sewage filtration device 3 and the secondary sewage filtration device 17 by opening the water outlet valve 13 and the liquid discharge valve 11, closing the liquid inlet valve 10 and the sewage discharge valve 15, starting the low-pressure water pump 4 to run for a period of time, and then opening the sewage discharge valve 15 to flow the flushed sewage back to the sewage tank 1. It can also clean the ceramic membrane processor by closing the low-pressure water pump 4 and the remaining valves, opening the air outlet valve 14, inflating the ceramic membrane processor through the gas source 16, opening the pulse switch provided in the ceramic membrane processor, and forming an air explosion by instantaneously releasing the trapped pressure gas, so as to restore the membrane flux of the ceramic membrane processor and the sewage treatment capacity, thereby realizing the cleaning of the ceramic membrane processor.

[0044] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sanitation vehicle with a two-stage sewage treatment recycling system, characterized in that, Comprising: A sanitation vehicle body, in which a fresh water tank (2) and a sewage tank (1) connected to a sewage suction device for sucking and collecting ground sewage are arranged; A primary sewage filtering device (3), which cooperates with a corresponding low-pressure water pump (4) to pump the sewage in the sewage tank (1) out and centrifugally filter out large-particle garbage. After the sewage containing large-particle garbage is re-discharged into the sewage tank (1); a secondary sewage filtering device (17), which is used for performing osmotic filtration on the sewage after filtering out large-particle garbage and discharging the filtered clear water into the fresh water tank (2), and discharging the filtered sewage into the primary sewage filtering device (3) for re-filtering; A backwashing device, which is used for flushing the primary sewage filtering device (3) and the secondary sewage filtering device (17) to remove the stains adhering to the primary sewage filtering device (3) and the secondary sewage filtering device (17); The primary sewage filtering device (3) includes a housing (301), and a corresponding sewage inlet (3011) and a sewage overflow port (3012) are respectively arranged at the upper and lower sides of the housing (301), and a corresponding filtered water outlet (3013) is arranged in the middle of the bottom side thereof; A filter screen cover (303) is rotatably installed in the housing (301), and the filtered water outlet (3013) extends upward through a corresponding diversion pipe (306) and communicates with the inside of the filter screen cover (303). The housing (301) and the filter screen cover (303) cooperate to form a corresponding liquid storage area. The high-speed rotating filter screen cover (303) centrifugally retains large-particle garbage in the liquid storage area and discharges it through the sewage overflow port (3012), and small-particle garbage and water body are filtered into the filter screen cover (303) and discharged through the filtered water outlet (3013); A pressure control mechanism is installed in the liquid storage area. After the liquid storage area is filled with liquid and stops, when the filter screen cover (303) rotates at a high speed for sewage filtering, the pressure in the liquid storage area is increased by inflating through the pressure control mechanism; after the sewage filtering is completed and the pressure is released through the pressure control mechanism, the liquid storage area is filled with liquid again; An auxiliary drainage mechanism includes a siphon three-way pipe (307) fixedly connected to the diversion pipe (306). The siphon section of the siphon three-way pipe (307) is externally connected with a corresponding liquid extraction pipe (308). The liquid extraction pipe (308) is vertically arranged in the filter screen cover (303). Under the action of siphon, the sewage passes through the filter screen cover (303) and then enters the diversion pipe (306) along the liquid extraction pipe (308) and is discharged together.

2. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 1, characterized in that, The filter screen cover (303) is rotationally installed in the housing (301) through the bearing seats at the upper and lower ends and the corresponding high-speed motor (302) in cooperation. The pressure control mechanism includes an annular airbag (305) arranged in the liquid placement area and controlled by the corresponding supercharger pump (304) to expand and contract. The annular airbag (305) is connected to the air outlet end of the supercharger pump (304) through the corresponding air duct, and an exhaust valve is fixedly installed on the air duct. When the annular airbag (305) is inflated, it is used to increase the pressure in the liquid placement area to push the liquid in the liquid placement area to flow into the filter screen cover (303). When the exhaust valve is opened to deflate and contract the annular airbag (305), it is used to relieve the pressure in the liquid placement area.

3. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 2, wherein, The impeller of the supercharger pump (304) is connected to the output shaft of the high-speed motor (302) through the corresponding driving shaft in a gear meshing manner, and a corresponding clutch (5) is installed on the driving shaft connecting the impeller to control the connection between the supercharger pump (304) and the high-speed motor (302).

4. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 2, wherein, An annular positioning plate (8) for sealingly installing the annular airbag (305) is fixedly arranged at the top inside the housing (301). The output shaft of the high-speed motor (302) is rotationally connected to the annular positioning plate (8) and the housing (301) through the corresponding bearings. The upper bearing seat for installing the filter screen cover (303) is fixedly installed on the annular positioning plate (8), and the lower bearing seat for installing the filter screen cover (303) is fixedly installed inside the housing (301) through a plurality of support rods.

5. A sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 1, characterized in that, A number of siphon three-way pipes (307) are misaligned and connected to the diversion pipe (306), and the liquid extraction pipes (308) connected outward by the siphon three-way pipes (307) are evenly distributed along the circumference of the filter screen cover (303). The liquid extraction pipes (308) are fixedly installed on the lower bearing seat. The liquid extraction pipes (308) are arranged at a certain distance from the filter screen cover (303), and at least one row of liquid guide holes (3081) is arranged on the outer peripheral surface of the liquid extraction pipes (308) from top to bottom. The liquid guide holes (3081) face the adjacent filter screen cover (303). Under the siphon effect, the sewage passes through the filter screen cover (303) and then enters the liquid extraction pipes (308) through the liquid guide holes (3081).

6. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 2, characterized in that, On the housing (301), a corresponding upper liquid level sensor (6) and a lower liquid level sensor (7) are arranged up and down within the liquid placement area. When the annular airbag (305) inflates, expands, and boosts pressure to push the liquid within the liquid placement area to flow into the filter mesh cover (303) until the liquid level is lower than the lower liquid level sensor (7), the booster pump (304) stops supplying air and the annular airbag (305) deflates and relieves pressure. Then, the low-pressure water pump (4) operates to continue filling the housing (301) with sewage. When the sewage within the liquid placement area reaches the upper liquid level sensor (6), the low-pressure water pump (4) stops operating, and the booster pump (304) and the high-speed motor (302) are connected through a clutch (5) and a speed reducer to inflate the annular airbag (305) through the booster pump (304) to boost the pressure within the liquid placement area.

7. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 1, characterized in that, The secondary sewage filtration device (17) is a ceramic membrane processor, which is sequentially provided with a support layer, a transition layer, and a filtration layer with gradually decreasing pore diameters from outside to inside. A corresponding pressure gauge, unloading valve, and pulse switch are arranged in the ceramic membrane processor. The water outlet of the ceramic membrane processor is connected to the clean water tank (2) through a corresponding flow meter (9). When the value detected by the flow meter (9) is lower than the set value Q1, the liquid inlet valve (10) connecting the sewage tank (1) and the low-pressure water pump (4) is closed and the backwashing device is started.

8. An environmental sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 7, characterized in that, The filtered water outlet (3013) of the primary sewage filtration device (3) is connected to the liquid inlet of the ceramic membrane processor through a corresponding drain valve (11). The sewage outlet of the ceramic membrane processor is connected to the sewage inlet (3011) of the primary sewage filtration device (3) through a corresponding return valve (12). Moreover, the clean water tank (2) is connected to the low-pressure water pump (4) through a corresponding water outlet valve (13). The sewage overflow port (3012) of the primary sewage filtration device (3) is connected to the sewage tank (1) through a sewage discharge valve (15). When the primary sewage filtration device (3) is cleaned through the backwashing device, the liquid inlet valve (10) and the drain valve (11) are closed, the water outlet valve (13) and the sewage discharge valve (15) are opened, and the low-pressure water pump (4) is started to clean the primary sewage filtration device (3) with the clean water in the clean water tank (2). When the primary sewage filtration device (3) and the secondary sewage filtration device (17) are cleaned through the backwashing device, the water outlet valve (13) and the drain valve (11) are opened, the liquid inlet valve (10) and the sewage discharge valve (15) are closed. After the low-pressure water pump (4) operates for a period of time, the sewage discharge valve (15) is opened to flow the flushed sewage back to the sewage tank (1).

9. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 8, characterized in that, The backwashing device further includes a gas source (16) connected to the ceramic membrane processor through a corresponding air outlet valve (14), and a corresponding pulse switch is provided inside the ceramic membrane processor; when cleaning is performed through the secondary sewage filtering device (17) of the backwashing device, the low-pressure water pump (4) and the remaining valves are closed, and the air outlet valve (14) is opened. After the ceramic membrane processor is inflated through the gas source (16), the pulse switch provided inside the ceramic membrane processor is opened, and air explosion is formed by instantaneously releasing the trapped pressure gas, so that the ceramic membrane processor restores its membrane flux and sewage treatment capacity.

10. The sanitation vehicle with a two-stage sewage treatment and recycling system according to claim 9, characterized in that, The inlet valve (10), drain valve (11), water outlet valve (13), sewage discharge valve (15) and air outlet valve (14) are all pneumatically controlled valves, the reflux valve (12) is a throttle valve, and a corresponding throttle valve is further provided between the sewage overflow port (3012) of the primary sewage filtering device (3) and the sewage tank (1).

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