Rainwater treatment device and method

Abstract

The present invention discloses a rainwater treatment device, which comprises: a water collection tank, at the bottom of which there are a first drain port, a second drain port and a sewage discharge port, and a first plug and a second plug are respectively arranged corresponding to the first drain port and the second drain port; a filter cylinder, which is coaxially arranged inside the water collection tank, and a filter screen is arranged in the middle of the filter cylinder; a clean water tank, the top of which is communicated with the first drain port; a sewage tank, the top of which is communicated with the second drain port and the sewage discharge port; and a sewage guiding pipe, inside which a third plug is coaxially arranged. By arranging a floating ball in the filter cylinder in the present invention, when the filter screen is blocked, the buoyancy of water is utilized to drive the floating ball to move upward, thereby automatically opening the sewage discharge port and the second drain port and closing the first drain port, realizing the automatic cleaning of the filter screen. At the same time, the sewage for cleaning the filter screen can be collected into the sewage tank, avoiding the sewage for cleaning the filter screen from flowing into the clean water tank and causing secondary pollution to the rainwater after filtration and purification.

Description

Technical Field

[0001] The present invention relates to the technical field of rainwater treatment. More specifically, the present invention relates to a rainwater treatment device and method. Background Art

[0002] Natural rainwater can be used as non-domestic water after filtration and purification treatment. For example, it can be used for crop irrigation, groundwater replenishment, industrial water, etc. Reasonable and effective rainwater recycling not only solves the global water shortage problem, but also alleviates the overloading pressure on the municipal underground drainage network caused by heavy rainfall.

[0003] In the prior art, simple rainwater grates are mostly used to filter rainwater. When rainwater passes through the grate, impurities such as soil and leaves mixed in the rainwater will block the water filter holes of the grate, reducing the water filtration rate of the grate, resulting in the drainage capacity not being able to keep up with the rainfall speed. The rainwater that cannot be drained in time will cause the road surface to be flooded, affecting people's normal travel.

[0004] In order to solve the problem of the water filter holes of the grate being blocked during the rainwater filtration process, a filtration device for a rainwater collection system is disclosed in the patent with the application number 201811533743.X. By setting a pushing component and a power component, during the rainwater filtration process, the impurity push plate can be pushed to reciprocate on the filter net, thereby realizing the cleaning of the impurities adhered to the filter net. Although the problem of the filter holes being blocked by impurities is solved, the start of the power component in the above patent technology needs to be manually controlled and cannot perform automatic cleaning operations according to the blockage situation of the filter net. At the same time, during the cleaning of the filter net, the soil or leaves adhered to the filter net will be crushed and then flow through the filter net into the filtered and purified water, resulting in secondary pollution of the filtered and purified rainwater. Summary of the Invention

[0005] An object of the present invention is to solve at least the above problems and provide at least the advantages described hereinafter.

[0006] Another object of the present invention is to provide a rainwater treatment device, which by setting a floating ball in the filter cylinder, when the filter net is blocked, utilizes the buoyancy of water to drive the floating ball to move upward, thereby automatically opening the sewage outlet and the second drain outlet, closing the first drain outlet, realizing automatic cleaning of the filter net, and at the same time, the sewage for cleaning the filter net can be collected into the sewage tank, avoiding the sewage for cleaning the filter net from flowing into the clean water tank and causing secondary pollution to the filtered and purified rainwater.

[0007] Another object of the present invention is to provide a rainwater treatment method, which utilizes the above device to automatically clean the filter screen while isolating the sewage from the clean water tank during cleaning, filters the rainwater, ensures the efficiency and continuity of rainwater treatment, and can avoid secondary pollution of the filtered water in the clean water tank by the sewage generated during filter screen cleaning.

[0008] To achieve these and other advantages in accordance with the present invention, there is provided a rainwater treatment device, which comprises:

[0009] A water collection tank, which is a hollow cylindrical structure, and is provided with a first drain port, a second drain port and a sewage drain port at the bottom. The center of the sewage drain port is located on the axis of the water collection tank. A first plug is correspondingly arranged at the first drain port, and a second plug is correspondingly arranged at the second drain port;

[0010] A filter cylinder, which is coaxially arranged inside the water collection tank. The filter cylinder is a hollow frustum structure with a larger upper part and a smaller lower part and both ends open. The top edge of the filter cylinder is hermetically connected to the top edge of the water collection tank, and the bottom edge is hermetically connected to the sewage drain port. A circle of filter screen is arranged along the circumferential direction in the middle of the filter cylinder. A floating ball is movably arranged vertically inside the filter cylinder. The top of the filter cylinder is communicated with a rainwater drainage pipe;

[0011] A clean water tank, which is arranged below the water collection tank. The top of the clean water tank is communicated with the first drain port, and a water outlet hole is arranged at the bottom;

[0012] A sewage tank, which is arranged below the water collection tank. The top of the sewage tank is communicated with both the second drain port and the sewage drain port, and a sewage discharge hole is arranged at the bottom;

[0013] A sewage guiding pipe, which is arranged inside the water collection tank. The sewage guiding pipe is a frustum structure with a larger upper part and a smaller lower part. The top edge of the sewage guiding pipe is hermetically connected to the sewage drain port. A third plug with a conical structure is coaxially arranged inside the sewage guiding pipe, and the top of the third plug is connected to the floating ball.

[0014] Preferably, the rainwater treatment device further comprises a cleaning mechanism, which comprises:

[0015] A cleaning brush, which is arranged inside the filter cylinder. The cleaning brush is parallel to the generatrix of the filter cylinder. The bristles of the cleaning brush are attached to the filter screen. Both ends of the cleaning brush are rotatably connected to the inner wall of the filter cylinder along the circumferential direction;

[0016] A threaded rod, whose upper end is connected to the bottom of the floating ball and the lower end is connected to the third plug. The threaded rod is coaxially arranged with the third plug;

[0017] A threaded sleeve is threadably sleeved on the threaded rod, and one side of the threaded sleeve is connected to the bottom of the cleaning brush via a first connecting rod.

[0018] Preferably, in the rainwater treatment device, a fourth sealing plug is provided in the drainage hole;

[0019] The upper part of the sewage tank is provided with an overflow port which is communicated with the clean water tank and has a filter screen inside.

[0020] Preferably, in the rainwater treatment device, the first sealing plug and the bottom surface of the water collecting tank, the second sealing plug and the bottom surface of the water collecting tank, and the fourth sealing plug and the bottom surface of the sewage tank are all connected through a vertically arranged first telescopic rod.

[0021] Preferably, the rainwater treatment device further comprises:

[0022] A spring, the upper end of which is connected to the first sealing plug, and the lower end of which is connected to the bottom surface of the water collecting tank;

[0023] A rope body, one end of which is connected to the bottom of the first sealing plug, and the other end of which extends vertically downward, passes through a fixed pulley provided at the bottom of the clean water tank, extends obliquely upward to the inside of the sewage tank, and is connected to the lower part of the third sealing plug;

[0024] A second connecting rod, the upper end of which is connected to the third sealing plug, and the lower end of which is connected to the top of the fourth sealing plug; the bottom of the second sealing plug is connected to the second connecting rod through the third connecting rod;

[0025] Among them, when the distance between the water level in the filter cartridge and the top of the filter screen is not less than one-third of the height of the filter screen, the third sealing plug is located at the lower limit position to block the sewage pipe. At this time, the first sealing plug is located above the first drain outlet, the second sealing plug blocks the second drain outlet, and the fourth sealing plug blocks the sewage hole; when the distance between the water level in the filter cartridge and the top of the filter screen is less than one-third of the height of the filter screen, the float floats upward with the rise of the water level in the filter cartridge, driving the third sealing plug to move upward to release the blockage of the sewage pipe. At the same time, with the cooperation of the rope body, the first sealing plug moves downward to block the first drain outlet. With the cooperation of the second connecting rod and the third connecting rod, the second sealing plug and the fourth sealing plug both move upward to open the second drain outlet and the sewage hole.

[0026] Preferably, in the rainwater treatment device, the top of the float is connected to the top of the water collecting tank via a second telescopic rod, and the second telescopic rod is coaxially arranged with the third sealing plug.

[0027] Preferably, for the rainwater treatment device, the other side of the threaded sleeve is rotatably connected to the sewage outlet through a fourth connecting rod.

[0028] The present invention also provides a rainwater treatment method, which uses the above rainwater treatment device for rainwater treatment.

[0029] The present invention has at least the following beneficial effects:

[0030] 1. When the mesh holes of the filter screen are blocked, the present invention can automatically switch the drainage outlet to realize automatic cleaning of the filter screen and ensure the rainwater filtration rate; at the same time, it can also discharge the sewage generated by cleaning the filter screen to the sewage tank to avoid secondary pollution of the filtered clean water in the clean water tank and ensure the good water quality of the filtered water in the clean water tank;

[0031] 2. The present invention is provided with a cleaning mechanism, which includes a cleaning brush attached to the inner wall of the filter screen. The cleaning brush can rotate circumferentially relative to the filter screen around the axis of the filter cylinder, and can clean the mesh holes of the filter screen more effectively. By setting the threaded rod, threaded sleeve and first connecting rod, the rotation of the cleaning brush is driven by the up and down movement of the floating ball. While improving the cleaning effect and efficiency of the filter screen, the equipment structure is simplified, and there is no need to additionally set a power mechanism for the rotation of the cleaning brush, reducing the equipment cost;

[0032] 3. The present invention further cooperates with the design of a spring that elastically connects the first sealing plug to the bottom surface of the water collection tank, a rope body that associates the first sealing plug with the third sealing plug, a second connecting rod that associates the fourth sealing plug with the third sealing plug, and a third connecting rod that associates the second sealing plug with the third sealing plug. In order to ensure the tension of the rope body, a fixed pulley is arranged at the bottom of the clean water tank, realizing the up and down movement of the third sealing plug driven by the up and down movement of the floating ball, which can synchronously drive the movement of the first sealing plug, the second sealing plug and the fourth sealing plug. Specifically, when the floating ball moves up, it drives the third sealing plug to move upward. Under the action of the rope body and the fixed pulley, it drives the first sealing plug to move downward to block the first drainage port. Under the action of the second connecting rod and the third connecting rod, it drives the fourth sealing plug and the second sealing plug to move upward, thereby opening the sewage discharge hole and the second drainage port; when the floating ball moves down, it drives the third sealing plug to move downward. Under the action of the spring elasticity, the first sealing plug automatically moves upward to open the first drainage port. Under the action of the second connecting rod and the third connecting rod, it drives the fourth sealing plug and the second sealing plug to move downward, thereby blocking the sewage discharge hole and the second drainage port.

[0033] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and will also be understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1Schematic structural diagram of the rainwater treatment device described in one technical solution of the present invention in the filtering state;

[0035] Figure 2 Schematic structural diagram of the rainwater treatment device described in another technical solution of the present invention in the state of cleaning the filter screen;

[0036] Figure 3 Schematic structural diagram of the filter cylinder described in another technical solution of the present invention.

[0037] Explanation of reference numerals: 1 - water collection tank; 11 - first drain outlet; 111 - first plugging block; 12 - second drain outlet; 121 - second plugging block; 13 - sewage outlet; 2 - filter cylinder; 21 - filter screen; 22 - floating ball; 221 - second telescopic rod; 3 - clean water tank; 4 - sewage tank; 41 - sewage discharge hole; 411 - fourth plugging block; 42 - overflow port; 5 - sewage guiding pipe; 51 - third plugging block; 61 - cleaning brush; 62 - threaded rod; 63 - threaded sleeve; 64 - first connecting rod; 65 - fourth connecting rod; 7 - first telescopic rod; 81 - spring; 82 - rope body; 83 - fixed pulley; 84 - second connecting rod; 85 - third connecting rod. Detailed implementation manners

[0038] The following further describes the present invention in detail with reference to the drawings and embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0039] It should be understood that terms such as "having", "including", and "comprising" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0040] In the description of the present invention, the orientation or positional relationship indicated by terms such as "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0041] As Figures 1 to 3 shown, the present invention provides a rainwater treatment device, which includes:

[0042] A water collection tank 1, which has a hollow cylindrical structure, and is provided with a first drain outlet 11, a second drain outlet 12 and a sewage outlet 13 at the bottom. The center of the sewage outlet 13 is located on the axis of the water collection tank. A first plugging block 111 is correspondingly arranged at the first drain outlet 11, and a second plugging block 121 is correspondingly arranged at the second drain outlet 12;

[0043] A filter cartridge 2, which is coaxially arranged inside the water collection tank 1. The filter cartridge 2 is a hollow frustum structure with a larger upper part and a smaller lower part and both ends open. The top edge of the filter cartridge 2 is hermetically connected to the top edge of the water collection tank 1, and the bottom edge is hermetically connected to the sewage outlet 13. A ring of filter net 21 is arranged along the circumferential direction in the middle of the filter cartridge 2. A floating ball 22 is movably arranged vertically inside the filter cartridge. The top of the filter cartridge 2 is communicated with the rainwater drainage pipe.

[0044] A clean water tank 3, which is arranged below the water collection tank 1. The top of the clean water tank 3 is communicated with the first drainage port 11, and a water outlet hole is arranged at the bottom.

[0045] A sewage tank 4, which is arranged below the water collection tank 1. The top of the sewage tank 4 is communicated with both the second drainage port 12 and the sewage outlet 13, and a sewage discharge hole 41 is arranged at the bottom.

[0046] A sewage guiding pipe 5, which is arranged inside the water collection tank 1. The sewage guiding pipe 5 is a frustum structure with a larger upper part and a smaller lower part. The top edge of the sewage guiding pipe 5 is hermetically connected to the sewage outlet 13. A third sealing plug 51 with a conical structure is coaxially arranged inside the sewage guiding pipe 5, and the top of the third sealing plug 51 is connected to the floating ball 22.

[0047] In the above technical solution, the present invention discloses a rainwater treatment device, which includes a water collection tank with a hollow cylindrical structure. A sewage discharge port is provided in the middle of its bottom surface, and a first drainage port and a second drainage port are respectively provided on both sides. A funnel-shaped filter cylinder with a larger upper part and a smaller lower part is arranged inside the water collection tank. The top edge of the filter cylinder is hermetically connected to the top edge of the water collection tank, and the bottom edge is hermetically connected to the circumferential side wall of the sewage discharge port. The filter cylinder divides the water collection tank into a filter area with a frustum structure that is larger at the top and smaller at the bottom in the middle, and a water collection area with an annular structure that is arranged around the periphery of the filter area. The filter area and the water collection area are communicated through a filter screen arranged in the middle of the filter cylinder. Rainwater enters the filter area through a rainwater drainage pipe, and the rainwater in the filter area passes through the filter screen and enters the water collection area; a floating ball is arranged inside the filter cylinder. When the water level in the filter cylinder reaches a certain height, the floating ball can float vertically upward in the filter cylinder as the water level rises (the path of the floating ball floating up or down can be limited by a vertically arranged telescopic rod or guide rod to ensure that the floating ball can move upward or downward vertically as the water level rises or falls). When the water level drops to a certain position, the floating ball moves vertically downward as the water level drops; a clean water tank and a sewage tank are arranged at the bottom of the water collection tank. The clean water tank is communicated with the water collection area through the first drainage port, and the sewage tank is communicated with the water collection area through the sewage discharge port, a sewage guide pipe and the second drainage port. A third sealing plug connected to the floating ball is arranged inside the sewage guide pipe. When the mesh holes of the filter screen are not blocked, the first drainage port is opened, the second sealing plug closes the second drainage port, and the third sealing plug closes the sewage guide pipe. The water collection area is communicated with the clean water tank through the first drainage port. The rainwater entering the filter area can pass through the filter screen, flow into the water collection area, and then be drained into the clean water tank through the first drainage port. The filtered clean water is collected in the clean water tank and discharged through a water outlet hole and used as non-domestic water (such as for plant irrigation or groundwater replenishment). When the mesh holes of the filter screen are blocked by impurities in the rainwater, too much rainwater accumulates in the filter area, the floating ball floats up and drives the third sealing plug to move upward, opening the sewage guide pipe. At the same time, the first drainage port is closed with a first sealing plug, and the second drainage port is opened. The water collection area is communicated with the sewage area through the sewage discharge port - sewage guide pipe and the second drainage port. At this time, the rainwater coming from the rainwater drainage pipe directly flows downward along the inner wall of the filter cylinder, and the flowing rainwater can wash the impurities adhered to the filter screen, thereby realizing the cleaning of the filter screen. And the sewage to be cleaned is discharged to the sewage tank through the sewage discharge port - sewage guide pipe. During the cleaning process of the filter screen, part of the sewage will enter the water collection area through the filter screen and then be discharged to the sewage tank through the second drainage port, avoiding the secondary pollution of the filtered clean water in the clean water tank caused by the sewage during the cleaning process of the filter screen;

[0048] When the mesh holes of the filter screen of the present invention are blocked, the drainage port can be automatically switched to realize the automatic cleaning of the filter screen and ensure the rainwater filtration rate; at the same time, it can also discharge the sewage generated by the cleaning of the filter screen to the sewage tank, avoiding the secondary pollution of the filtered clean water in the clean water tank and ensuring the good water quality of the filtered water in the clean water tank.

[0049] Working principle of the present invention: During the initial filtration, the mesh holes of the filter screen are not blocked, and the water entering the filtration area can pass through the filter screen in time and be discharged to the water collection area. The buoyancy of the floating ball is not sufficient to drive the floating ball to float upward. The third sealing plug just seals the sewage guiding pipe. At the same time, the second sealing plug seals the second drain port, and the first sealing plug does not seal the first drain port (i.e., the first drain port is in an open state). The water collection area is communicated with the clean water tank through the first drain port, and the water collection area is not communicated with the sewage tank; The rainwater is filtered through the filter screen, and the filtered clean water is collected in the clean water tank;

[0050] After the rainwater is filtered for a certain period of time, the soil or leaf impurities in the rainwater adhere to the inner wall of the filter screen, and the mesh holes of the filter screen are blocked, resulting in a slower filtration rate. The water in the filtration area cannot be discharged through the filter screen in time, and the water in the filtration area will increase, causing the water level to rise. The buoyancy of the floating ball increases. Under the action of the buoyancy, the floating ball floats up, driving the third sealing plug to move upward and opening the sewage guiding pipe. At the same time, when the third sealing plug moves upward to open the sewage guiding pipe, the first sealing plug closes the first drain port, and the second sealing plug moves above the second drain port to open the second drain port. The rainwater in the filtration area directly flows downward along the inner wall of the filter cylinder to wash the inner wall of the filter screen, realizing the cleaning of the filter screen and discharging the sewage generated during the cleaning process to the sewage tank through the sewage discharge port and the sewage guiding pipe. The sewage can be discharged to the municipal drainage system through the sewage discharge hole at the bottom of the sewage tank or be conveyed to the top of the filter cylinder through the conveying mechanism for re-filtration;

[0051] The water in the filtration area is discharged through the sewage discharge port. At the same time, under the action of the water flow, the inner wall of the filter screen is washed. After the inner wall of the filter screen is cleaned, the accumulated water in the filtration area is released, the water level drops, and the floating ball moves vertically downward with the drop of the water level, thereby driving the third sealing plug to seal the sewage guiding pipe. At the same time, the first drain port is opened (removing the blockage of the first drain port by the first sealing plug), and the second sealing plug moves to the position where it seals the second drain port. The rainwater in the filtration area can then be normally filtered through the filter screen, and the filtered rainwater is collected in the clean water tank through the first drain port.

[0052] In another technical solution, the rainwater treatment device further includes a cleaning mechanism, which includes:

[0053] A cleaning brush 61, which is arranged in the filter cylinder 2. The cleaning brush 61 is parallel to the generatrix of the filter cylinder 2. The bristles of the cleaning brush 61 are attached to the filter screen 21. The two ends of the cleaning brush 61 are respectively rotatably connected to the inner wall of the filter cylinder 2 along the circumferential direction;

[0054] A threaded rod 62, the upper end of which is connected to the bottom of the float 22, and the lower end of which is connected to the third sealing plug 51, and the threaded rod 62 and the third sealing plug 51 are coaxially arranged;

[0055] The threaded sleeve 63 is threadedly sleeved on the threaded rod 62, and one side of the threaded sleeve 63 is connected to the bottom of the cleaning brush 61 through a first connecting rod 64. The threaded sleeve and the threaded rod are provided with a certain pitch to ensure that the threaded rod and the threaded sleeve are spirally connected, so that the vertical linear motion of the threaded rod can drive the circumferential rotation of the threaded sleeve.

[0056] In the above technical scheme, the present invention is provided with a cleaning mechanism, which includes a cleaning brush arranged in contact with the inner wall of the filter screen, and the cleaning brush can rotate circumferentially relative to the filter screen around the axis of the filter cylinder, so as to more effectively clean the mesh of the filter screen. By arranging a threaded rod, a threaded sleeve and a first connecting rod, the rotation of the cleaning brush is driven by the upward and downward movement of the floating ball, which improves the cleaning effect and efficiency of the filter screen, simplifies the equipment structure, does not need to additionally arrange a power mechanism for the rotation of the cleaning brush, and reduces the equipment cost.

[0057] Specifically: the upward and downward movement of the float drives the upward and downward movement of the threaded rod. Since the threaded rod and the threaded sleeve are spirally connected, the upward and downward movement of the threaded rod drives the rotation of the threaded sleeve (the threaded rod can only keep moving up and down under the limiting effect that the float can only move in the vertical direction. The threaded sleeve is connected to the cleaning brush through the first connecting rod. Under the limiting effect of the cleaning brush, the threaded sleeve cannot move up and down and can only rotate in the circumferential direction). The rotation of the threaded sleeve in turn drives the rotation of the cleaning brush relative to the filter screen, thereby achieving brushing of the entire filter screen.

[0058] In another technical solution, in the rainwater treatment device, a fourth sealing plug 411 is provided in the drainage hole 41;

[0059] An overflow port 42 communicating with the clean water tank 3 is disposed at the upper portion of the sewage tank 4, wherein a filter screen is disposed inside the overflow port. The overflow port is preferably disposed at the side where the sewage pipe is located.

[0060] In the above technical solution, a fourth sealing plug is arranged in the sewage discharge hole. In the normal filtering state of the rainwater treatment device of the present invention, the third sealing plug is located in the sewage guiding pipe, the first drain opening is open, the second sealing plug seals the second drain opening, and the fourth sealing plug seals the sewage discharge hole; when the filter screen is blocked, the floating ball floats up, the third sealing plug moves up, and the sewage guiding pipe is opened. At the same time, the first drain opening is blocked by the first sealing plug, the second drain opening is opened, and the sewage discharge hole is opened. The sewage generated during the cleaning process of the filter screen enters the sewage tank through the sewage discharge port - sewage guiding pipe and the second drain opening, and then is discharged through the sewage discharge hole. The drainage volume of the sewage discharge hole is much smaller than the drainage volumes of the sewage discharge port and the second drain opening, and part of the sewage will remain in the sewage tank; when the third sealing plug moves down with the floating ball and returns to its original position (the third sealing plug seals the sewage guiding pipe again), the first drain opening is opened again, the sewage guiding pipe, the second drain opening, and the sewage discharge hole are closed, and the water in the sewage tank can be filtered through the filter screen of the overflow port and flows into the clean water tank, and part of the water resources can be further collected from the sewage tank. The overflow port is arranged at the upper part of the sewage tank to prevent the sludge deposited in the sewage tank from affecting the filtering effect of the filter screen.

[0061] In another technical solution, for the rainwater treatment device, the first sealing plug 111 and the bottom surface of the water collection tank 1, the second sealing plug 121 and the bottom surface of the water collection tank 1, and the fourth sealing plug and the bottom surface of the sewage tank 4 are all connected by a vertically arranged first telescopic rod 7. Through the vertically arranged first telescopic rod, the moving paths of the first sealing plug, the second sealing plug, and the fourth sealing plug can be limited, ensuring that the first sealing plug, the second sealing plug, and the fourth sealing plug move in the vertical direction, so that the first sealing plug, the second sealing plug, and the fourth sealing plug can block the first drain opening, the second drain opening, and the sewage discharge hole in time.

[0062] In another technical solution, the rainwater treatment device further includes:

[0063] A spring 81, whose upper end is connected to the top of the first sealing plug 111 and whose lower end is connected to the bottom surface of the water collection tank 1;

[0064] A rope 82, one end of which is connected to the bottom of the first sealing plug 111, extends vertically downward, passes through a fixed pulley 83 arranged at the bottom of the clean water tank 3, extends obliquely upward into the sewage tank 4, and is connected to the lower part of the third sealing plug 51;

[0065] A second connecting rod 84, whose upper end is connected to the third sealing plug 51 and whose lower end is connected to the top of the fourth sealing plug 411; the bottom of the second sealing plug 121 is connected to the second connecting rod 84 through a third connecting rod 85;

[0066] Among them, when the distance between the water level in the filter cartridge 2 and the top of the filter screen 22 is not less than one-third of the height of the filter screen 21, the third sealing plug 51 is located at the lower limit position to block the sewage pipe 5. At this time, the first sealing plug 111 is located above the first drain port 11 (the spring is in a naturally extended state or a slightly compressed state), the second sealing plug 121 blocks the second drain port 12, and the fourth sealing plug 411 blocks the sewage hole 41; when the distance between the water level in the filter cartridge 2 and the top of the filter screen 21 is less than one-third of the height of the filter screen 21 The float 22 floats upward as the water level in the filter cartridge 2 rises, driving the third sealing plug 51 to move upward, thereby releasing the blockage of the sewage pipe 5. At the same time, with the cooperation of the rope body 82, the first sealing plug 111 moves downward (the spring is compressed to store force for the first sealing plug to automatically return to the position above the first drain outlet) to block the first drain outlet 11. With the cooperation of the second connecting rod 84 and the third connecting rod 85, the second sealing plug 121 and the fourth sealing plug 411 both move upward, thereby opening the second drain outlet 12 and the sewage discharge hole 41.

[0067] In the above technical scheme, the present invention further cooperates with the design of a spring that elastically connects the first sealing plug to the bottom surface of the water collecting tank, a rope body that links the first sealing plug to the third sealing plug, a second connecting rod that links the fourth sealing plug to the third sealing plug, and a third connecting rod that links the second sealing plug to the third sealing plug. In order to ensure the tension of the rope body, a fixed pulley is arranged at the bottom of the clean water tank, so that the floating ball moves up and down and drives the third sealing plug to move up and down, and can synchronously drive the movement of the first sealing plug, the second sealing plug and the fourth sealing plug. Specifically, the floating ball moves up and drives the third sealing plug to move upward. Under the action of the rope body and the fixed pulley, the first sealing plug is driven to move downward to block the first drain outlet. Under the action of the second connecting rod and the third connecting rod, the fourth sealing plug and the second sealing plug are driven to move upward, and then the sewage hole and the second drain outlet are opened; the floating ball sinks and drives the third sealing plug to move downward. Under the action of the spring elastic force, the first sealing plug automatically moves upward to open the first drain outlet. Under the action of the second connecting rod and the third connecting rod, the fourth sealing plug and the second sealing plug are driven to move downward, and then the sewage hole and the second drain outlet are blocked.

[0068] In another technical solution, in the rainwater treatment device, the top of the float 22 is connected to the top of the water collecting tank 1 through a second telescopic rod 221, and the second telescopic rod 221 is coaxially arranged with the third sealing plug 51. By arranging a vertical second telescopic rod between the float and the top of the water collecting tank, the floating and sinking paths of the float can be limited to ensure that the movement of the float always remains vertically upward or vertically downward.

[0069] In another technical solution, for the rainwater treatment device, the other side of the threaded sleeve 63 is rotatably connected to the sewage outlet 13 through a fourth connecting rod 65. (A circular chute is provided on the inner wall of the sewage outlet. One end of the second connecting rod is connected to the threaded sleeve, and the other end is slidably connected to the chute through a slider.) The fourth connecting rod is provided to rotatably connect the threaded sleeve and the sewage outlet in the circumferential direction, improving the stability of the rotation of the threaded sleeve.

[0070] The present invention also provides a rainwater treatment method. Using the above rainwater treatment device for rainwater treatment, the rainwater drainage pipe is communicated with the top of the filter cylinder. Natural rainwater is drained through the rainwater drainage pipe into the filter cylinder. The rainwater is filtered and purified through the filter screen. During the filtering process, when the filter screen is blocked, the rainwater treatment device can automatically switch from the filtering state to the state of cleaning the filter screen. After the mesh holes of the filter screen are cleaned, the rainwater treatment device automatically switches back to the filtering state to continue filtering the rainwater.

[0071] Specifically: Before rainwater treatment or in the early stage of rainwater treatment (when the mesh holes of the filter screen are not blocked), the rainwater treatment device is in the filtering state: the floating ball is located at the bottom of the filter cylinder, the third sealing plug seals the sewage guiding pipe, the first sealing plug is located above the first drain port, the spring is in a natural elongation state or a slightly compressed state, the second sealing plug seals the second drain port, and the fourth sealing plug seals the sewage discharge hole;

[0072] After rainwater treatment for a certain period of time, the mesh holes of the filter screen are blocked, and the rainwater treatment device automatically switches to the state of cleaning the filter screen: Natural rainwater enters the filter cylinder through the drainage pipe. Since the mesh holes of the filter screen are blocked, the rainwater in the filter cylinder accumulates more and more, the water level rises, and the buoyancy of the floating ball becomes larger. When the distance between the water level in the filter cylinder and the top of the filter screen is less than one-third of the height of the filter screen, the buoyancy of the floating ball is just equal to the gravity of the floating ball (here, the gravity includes the self-gravity of the floating ball and the additional gravity generated by other components directly or indirectly connected to the floating ball). When the water level continues to rise, the buoyancy of the floating ball is greater than the gravity of the floating ball, and the floating ball moves upward vertically along with the rising water level, driving the third sealing plug to move upward to open the sewage guiding pipe. The upward movement of the third sealing plug drives the first sealing plug to move downward to close the first drain port, drives the fourth sealing plug to move upward to open the sewage discharge hole, drives the second sealing plug to move upward to open the second drain port, and switches to the state of cleaning the filter screen; The upward movement of the floating ball also drives the upward movement of the threaded rod, thereby driving the rotation of the threaded sleeve, and further driving the cleaning brush to brush the filter screen;

[0073] The water in the filtration area is discharged through the sewage outlet - sewage guiding pipe. At the same time, the water flow can wash and clean the mesh holes of the filter net. The water level in the filtration area drops, and the floating ball sinks, driving the threaded rod and the third sealing plug to move downward. The downward movement of the threaded rod drives the threaded sleeve to rotate in the reverse direction. The downward movement of the third sealing plug drives the second sealing plug and the fourth sealing plug to move downward to seal the second drain port and the sewage guiding pipe again. The downward movement of the third sealing plug drives the other end of the rope body to move downward. Under the elastic force of the spring, the first sealing plug moves upward, thereby opening the first drain port again. At this time, the rainwater treatment device returns to the filtration state.

[0074] The equipment quantities and treatment scales described here are used to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be obvious to those skilled in the art.

[0075] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. Rainwater treatment device, characterized in that, comprising: A collecting water tank, which is a hollow cylindrical structure, with a first drain port, a second drain port and a sewage discharge port at the bottom. The center of the sewage discharge port is located on the axis of the collecting water tank. A first plug is correspondingly arranged at the first drain port, and a second plug is correspondingly arranged at the second drain port; A filter cylinder, which is coaxially arranged inside the collecting water tank. The filter cylinder is a hollow frustum structure with a larger upper part and a smaller lower part and both ends open. The top edge of the filter cylinder is hermetically connected to the top edge of the collecting water tank, and the bottom edge is hermetically connected to the sewage discharge port; A circle of filter net is arranged along the circumferential direction in the middle of the filter cylinder; A floating ball is movably arranged vertically inside the filter cylinder; The top of the filter cylinder is communicated with the rainwater drainage pipeline; A clean water tank, which is arranged below the collecting water tank. The top of the clean water tank is communicated with the first drain port, and there is a water outlet hole at the bottom; A sewage tank, which is arranged below the collecting water tank. The top of the sewage tank is communicated with both the second drain port and the sewage discharge port, and there is a sewage discharge hole at the bottom. A fourth plug is arranged inside the sewage discharge hole; A sewage guiding pipe, which is arranged inside the collecting water tank. The sewage guiding pipe is a frustum structure with a larger upper part and a smaller lower part. The top edge of the sewage guiding pipe is hermetically connected to the sewage discharge port. A third plug with a conical structure is coaxially arranged inside the sewage guiding pipe, and the top of the third plug is connected to the floating ball; A cleaning brush, which is arranged inside the filter cylinder. The cleaning brush is parallel to the generatrix of the filter cylinder, the bristles of the cleaning brush are attached to the filter net, and both ends of the cleaning brush are rotationally connected to the inner wall of the filter cylinder along the circumferential direction; A threaded rod, whose upper end is connected to the bottom of the floating ball and the lower end is connected to the third plug. The threaded rod is coaxially arranged with the third plug; A threaded sleeve, which is rotationally sleeved on the threaded rod by threads. One side of the threaded sleeve is connected to the bottom of the cleaning brush through a first connecting rod; A spring, whose upper end is connected to the first plug and the lower end is connected to the bottom surface of the collecting water tank; A rope body, one end of which is connected to the bottom of the first plug, and the other end extends vertically downward, passes through a fixed pulley arranged at the bottom of the clean water tank, extends obliquely upward into the sewage tank, and is connected to the lower part of the third plug; A second connecting rod, whose upper end is connected to the third plug and the lower end is connected to the top of the fourth plug; The bottom of the second plug is connected to the second connecting rod through a third connecting rod.

2. The rainwater treatment device according to claim 1, characterized in that, An overflow port communicated with the clean water tank is arranged at the upper part of the sewage tank, and a filter net is arranged inside it.

3. The rainwater treatment device according to claim 2, characterized in that, The first plug and the bottom surface of the collecting water tank, the second plug and the bottom surface of the collecting water tank, and the fourth plug and the bottom surface of the sewage tank are all connected through vertically arranged first telescopic rods.

4. The rainwater treatment device according to claim 3, characterized in that, When the distance between the water level in the filter cartridge and the top of the filter screen is not less than one-third of the height of the filter screen, the third sealing plug is located at the lower limit position to block the sewage pipe. At this time, the first sealing plug is located above the first drain outlet, the second sealing plug blocks the second drain outlet, and the fourth sealing plug blocks the sewage hole; when the distance between the water level in the filter cartridge and the top of the filter screen is less than one-third of the height of the filter screen, the float floats upward with the rise of the water level in the filter cartridge, driving the third sealing plug to move upward to release the blockage of the sewage pipe. At the same time, with the cooperation of the rope body, the first sealing plug moves downward to block the first drain outlet. With the cooperation of the second connecting rod and the third connecting rod, the second sealing plug and the fourth sealing plug both move upward to open the second drain outlet and the sewage hole.

5. The rainwater treatment device according to claim 1, It is characterized in that The top of the float is connected to the top of the water collecting tank through a second telescopic rod, and the second telescopic rod is coaxially arranged with the third sealing plug.

6. The rainwater treatment device according to claim 1, It is characterized in that The other side of the threaded sleeve is rotatably connected to the sewage outlet through a fourth connecting rod.

7. Rainwater treatment methods, It is characterized in that Rainwater treatment is performed using the rainwater treatment device as described in any one of claims 1 to 6.

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