A rainwater and sewage well backflow prevention and sewage interception device and its working method
By setting up the mechanical structure of the rainwater and sewage merge inlet pipe, rainwater drain pipe and sewage drain pipe in the rainwater well, the opening and closing of the sewage interceptor valve is automatically adjusted, and the problems of sewage backflow and high maintenance costs are solved, and the effective isolation of the rainwater system is achieved and low-cost maintenance.
Patent Information
- Application Number
- CN201911388190.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-12-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2039-12-30
AI Technical Summary
Existing floating and electronically controlled sewage intercepting equipment can easily lead to sewage backflow when the amount of sewage increases, and the maintenance cost is high, affecting the rainwater treatment system.
A wastewater well anti-flow and sewage intercepting device was designed. By setting up rainwater and sewage merge inlet pipe, rainwater drain pipe and sewage drain pipe in the rainwater well, using machinery such as sewage interceptor valve, water throttle, lever and limit slot. Structure, automatically adjusts the opening and closing of the sewage valve according to changes in rainfall and sewage, to prevent sewage from entering the rainwater system.
Effectively prevent sewage from mixing into the rainwater system, avoid rainwater backflow, reduce maintenance costs, and improve sewage interception effect.
Smart Images
Figure CN110905069B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of drainage treatment, and in particular to a rainwater and sewage well backflow prevention and sewage interception device and a working method thereof. Background Art
[0002] A rainwater well is a unified collection facility for urban precipitation. The seepage pipe extending downward from the bottom can replenish rainwater into the underground, and the excess rainwater is discharged through the drainage pipe. Its function is to slow down ground subsidence and prevent road pavement from being flooded during heavy rain. A sewage well is a sewer for urban sewage discharge and sewage disposal. Urban sewage includes various impurities, dirt, and sewage with mixed components. A rainwater and sewage well is an urban public facility that combines a rainwater well and a sewage well. Its advantages are: it reduces the cost, cycle, and construction difficulty of the project. Due to the special purpose of the rainwater and sewage well, sewage interception equipment must be installed at the sewage inlet pipeline to prevent sewage backflow during rain discharge. However, the common float-type and electrically controlled sewage interception equipment still have the following shortcomings:
[0003] 1. When the amount of sewage increases, sewage will be mixed in through the rainwater pipe, affecting the rainwater treatment system;
[0004] 2. The debris in the sewage can easily affect the buoy and cause rainwater backflow;
[0005] 3. The maintenance cost of electronically controlled sewage interception equipment is high. Summary of the invention
[0006] In order to solve the technical problems existing in the background technology, the present invention provides a rainwater and sewage well anti-backflow and sewage interception device to prevent sewage from mixing into the rainwater system; the sewage interception effect is good, preventing rainwater from backflowing and entering the sewage pipe network; the mechanical structure is easy to maintain and low in cost.
[0007] The technical solution adopted by the present invention is:
[0008] A rainwater and sewage well backflow prevention and sewage interception device, wherein a rainwater and sewage combined inlet pipe and a rainwater discharge pipe are relatively arranged in the rainwater and sewage well, and a sewage discharge pipe is staggeredly arranged below the rainwater and sewage combined inlet pipe and the rainwater discharge pipe.
[0009] The sewage pipe is provided with a sewage interception valve, and a vertical support rod is fixedly provided on the outer wall of the sewage pipe. A lever is hingedly provided on the upper top of the support rod, and one end of the lever is connected to the stroke end of the sewage interception valve; a multi-layer water flushing disc is provided at the other end of the lever, and a straight rod is connected between the water flushing discs.
[0010] The end of the rainwater-sewage combined inlet pipe is connected with an elbow, and the outlet end of the elbow is downwardly arranged just above the water flushing plate. A support frame is fixedly arranged on the outer wall of the elbow away from the rainwater-sewage combined inlet pipe. A vertical slide is arranged at the end of the support frame. A connecting rod is slidably arranged in the vertical slide. The lower end of the connecting rod is fixedly connected to the straight rod.
[0011] A first limiting slot and a hinge seat are respectively provided at the upper and lower ends of the pipe mouth of the rainwater drain pipe, and a sewage intercepting plate is hingedly provided on the hinge seat, and the sewage intercepting plate is arranged in an "8" shape: a hinge hole hinged to the hinge seat is arranged in the center of the sewage intercepting plate; the lower section of the sewage intercepting plate is arranged as a circular sealing plate, and a limiting protrusion is arranged on the edge of the plate surface of the sealing plate facing the rainwater drain pipe, and the limiting protrusion is used to limit the position of the sewage intercepting plate rotating around the hinge seat, so that the rainwater drain pipe is closed when the sealing plate is rotated to the pipe mouth of the rainwater drain pipe, and a buoy is fixedly provided on the plate surface of the sealing plate facing away from the rainwater drain pipe; the upper section of the sewage intercepting plate is arranged as a circular hole-shaped drainage window, and a second limiting slot is arranged on the upper end of the drainage window, and the second and first limiting slots have the same structure, and both are arranged directly below the upper section of the connecting rod.
[0012] Furthermore, the sewage intercepting valve includes a valve body which is sealingly connected to the sewage discharge pipe, the upper end of the valve body is sealed with a sealing cover, the central part of the sealing cover is sealed and a valve stem is slidably provided, the upper end of the valve stem is hinged to the lever, a limit plate is fixedly provided in the middle of the valve stem, a movable sleeve on the valve stem is provided with a reset spring, and the upper and lower ends of the reset spring are respectively fixedly connected to the limit plate and the sealing cover.
[0013] Furthermore, a horizontal hanging column is provided at the upper top of the valve stem, and a long strip-shaped through groove is penetrated through the end of the lever away from the water flushing plate, and the hanging column is movably inserted in the through groove.
[0014] Furthermore, the limiting protrusion and the buoy are respectively arranged on both sides of the vertical central axis.
[0015] Furthermore, the connecting rod is arranged in a "Z" shape: the end of the lower section of the connecting rod is fixedly connected to the straight rod, the end of the upper section of the connecting rod is hingedly provided with a movable rod, a spring is sleeved at the hinge between the connecting rod and the movable rod, and a fixed sleeve is fixedly provided at one end of the spring close to the connecting rod, and the fixed sleeve is fixedly sleeved on the connecting rod.
[0016] Furthermore, a torsion spring connecting seat is fixedly provided on the outer wall of the lower end outlet of the elbow on the combined rainwater and sewage inlet pipe, a circular drainage plate is fixedly provided on the other torque arm of the torsion spring connecting seat, and a sewage discharge hole deviating from the center of the drainage plate is penetrated on the plate surface of the drainage plate.
[0017] A working method of a rainwater and sewage well backflow prevention and sewage interception device, comprising:
[0018] A. During the sewage discharge phase, no rainwater enters the rainwater and sewage well from the combined rainwater and sewage inlet pipe, and the sewage interception valve is in the open state:
[0019] ①. When the sewage inflow is normal, the sewage flows along the sewage discharge direction, and the sewage in the rainwater and sewage well is discharged to the sewage treatment end through the sewage discharge pipe;
[0020] ② When the sewage inflow is too large, the sewage level in the rainwater and sewage well rises, and the float rises with the water level. The sewage interception plate rotates around the hinge seat / hinged hole, so that the sealing plate rotates until the limiting protrusion set on the edge of the plate surface is stuck to the pipe mouth of the rainwater drainage pipe. The sealing plate blocks the pipe mouth of the rainwater drainage pipe to prevent sewage from entering the rainwater drainage pipe. At the same time, the high water level sewage in the rainwater and sewage well increases the pressure at the bottom of the rainwater and sewage well, thereby increasing the sewage discharge capacity of the sewage drainage pipe;
[0021] B. Rain drainage stage:
[0022] ① A large amount of rainwater enters the rainwater and sewage well through the rainwater and sewage combined inlet pipe. The elbow on the rainwater and sewage combined inlet pipe makes the rainwater flush the water flushing plate downward and move downward, that is, one end of the water flushing plate of the lever moves downward; the other end of the lever moves upward and closes the sewage interception valve to prevent sewage from being discharged from the sewage pipe;
[0023] ② When the water flushing disc moves downward, the straight rod arranged between the water flushing discs drives the connecting rod to move downward. At the same time, the connecting rod only moves vertically downward under the limitation of the vertical sliding seat, and the other end of the connecting rod is clamped into the first and second limit slots. At this time, even if the water level of the rainwater and sewage well rises, the sewage intercepting plate cannot rotate around the hinge seat / hinged hole, and the rainwater in the rainwater and sewage well flows along the rainwater discharge direction through the drainage window and is discharged from the rainwater drainage pipe;
[0024] ③. When the initial rainwater enters, due to the small amount of rainfall, the water flow cannot flush the dynamic water flushing plate. At this time, the sewage interception valve is in the open state, and the rainwater is discharged from the sewage pipe.
[0025] The advantages of the rainwater and sewage well backflow prevention and sewage interception device of the present invention are:
[0026] 1. Through the sewage interception plate installed on the rainwater drainage pipe, the opening and closing of the rainwater drainage pipe in the two states of sewage discharge and rain discharge are distinguished. When the amount of sewage increases, it prevents sewage from entering the rainwater system;
[0027] 2. Use the water flow rate of the combined rainwater and sewage inlet pipe to adjust the opening and closing of the sewage interception valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the specific implementation of the present invention, the drawings required in the specific implementation are briefly introduced below. The drawings in the following description are implementations of the present invention.
[0029] Figure 1 It is a general three-dimensional schematic diagram of a rainwater and sewage well backflow prevention and sewage interception device provided by an example of the present invention;
[0030] Figure 2 It is a partial enlarged schematic diagram of a sewage pipe of a rainwater and sewage well anti-backflow and sewage interception device provided by an example of the present invention;
[0031] Figure 3 This is a partial enlarged schematic diagram of a rainwater drainage pipe of a rainwater and sewage well anti-backflow and sewage interception device provided by an example of the present invention Figure 1 ;
[0032] Figure 4 This is a partial enlarged schematic diagram of a rainwater drainage pipe of a rainwater and sewage well anti-backflow and sewage interception device provided by an example of the present invention Figure 2 ;
[0033] Figure 5 It is a partially enlarged schematic diagram of a rainwater and sewage well backflow prevention and sewage interception device provided by an example of the present invention;
[0034] Figure 6 The present invention provides a partially enlarged cross-sectional schematic diagram of a rainwater and sewage well backflow prevention and sewage interception device according to an example.
[0035] In the figure:
[0036] 10. Sewage pipe, 11. Sewage interception valve, 111. Valve body, 112. Sealing gland, 113. Valve stem, 114. Limit plate, 115. Reset spring, 12. Support rod, 13. Lever, 14. Water flushing disc, 15. Straight rod,
[0037] 30. Combined rainwater and sewage inlet pipe, 31. Elbow, 32. Support frame, 33. Vertical slide seat, 34. Connecting rod, 341. Movable rod, 342. Fixed sleeve, 343. Spring, 35. Torsion spring connecting seat, 36. Drainage plate, 37. Drain hole,
[0038] 40. Rainwater drainage pipe, 401. First limit slot, 402. Articulated seat, 41. Sewage intercepting plate, 411. Articulated hole, 412. Sealing plate, 413. Limiting protrusion, 414. Drain window, 415. Second limit slot, 42. Float,
[0039] a. Sewage flow direction, b. Rainwater flow direction. DETAILED DESCRIPTION
[0040] In order to more clearly and specifically explain the specific implementation purpose and implementation mode of the present invention, the technical solution of the present invention will be fully described below. The described embodiments are part of the embodiments of the present invention, but not all of them. Without making creative work, all other embodiments based on the embodiments described in the present invention belong to the protection scope of the present invention.
[0041] Embodiment 1:
[0042] The present invention provides a sewage interception device for preventing backflow of rainwater and sewage wells, such as Figure 1 As shown, a rainwater and sewage well backflow prevention and sewage interception device is provided, wherein a rainwater and sewage combined inlet pipe 30 and a rainwater discharge pipe 40 are relatively arranged in the rainwater and sewage well, and a sewage discharge pipe 10 is staggeredly arranged below the rainwater and sewage combined inlet pipe 30 and the rainwater discharge pipe 40.
[0043] like Figure 2 As shown, a sewage interception valve 11 is provided on the sewage discharge pipe 10, and the sewage interception valve 11 includes a valve body 111 which is sealed and connected to the sewage discharge pipe 10, and a sealing gland 112 is sealed on the upper end of the valve body 111, and a valve stem 113 is sealed and slidably provided in the center of the sealing gland 112, and the upper top of the valve stem 113 is hinged to the lever 13, and a horizontal hanging column is provided on the upper top of the valve stem 113, and a limit plate 114 is fixedly provided in the middle of the valve stem 113, and a reset spring 115 is movably sleeved on the valve stem 113, and the upper and lower ends of the reset spring 115 are respectively fixedly connected to the limit plate 114 and the sealing gland 112. A vertical support rod 12 is fixedly provided on the outer wall of the sewage discharge pipe 10, and a lever 13 is hingedly provided on the upper top of the support rod 12. A long strip-shaped through groove is penetrated at one end of the lever 13, and a hanging column provided on the valve stem 113 is movably inserted in the through groove; a water flushing plate 14 is provided at the other end of the lever 13, and the water flushing plate 14 is configured as a multi-layer downwardly concave circular plate, and the diameter of the plate mouth of each layer of the water flushing plate 14 gradually increases from top to bottom, and straight rods 15 are connected between the water flushing plates 14.
[0044] like Figure 1 As shown, the end of the rainwater-sewage combined inlet pipe (30) is connected to an elbow 31, and the outlet end of the elbow 31 is downwardly arranged just above the water flushing plate 14. A support frame 32 is fixedly arranged on the outer wall of the elbow 31 away from the rainwater-sewage combined inlet pipe 30. A vertical slide seat 33 is arranged at the end of the support frame 32. A connecting rod 34 is slidably arranged in the vertical slide seat 33. The connecting rod 34 is arranged in a "Z" shape: the end of the lower section of the connecting rod 34 is fixedly connected to the straight rod 15, as shown in FIG. Figure 5 As shown, the end of the upper section of the connecting rod 34 is hingedly provided with a movable rod 341, and a spring 343 is sleeved at the hinge between the connecting rod 34 and the movable rod 341. The spring 343 is fixedly provided with a fixed sleeve 342 at one end close to the connecting rod 34, and the fixed sleeve 342 is fixedly sleeved on the connecting rod 34. The lower end of the connecting rod 34 is fixedly connected to the straight rod 15.
[0045] The upper and lower ends of the rainwater drain pipe 40 are respectively provided with a first limit slot 401 and a hinge seat 402, and the hinge seat 402 is hingedly provided with a sewage interception plate 41, and the sewage interception plate 41 is arranged in an "8" shape: a hinge hole 411 hinged to the hinge seat 402 is arranged in the center of the sewage interception plate 41; the lower section of the sewage interception plate 41 is arranged as a circular sealing plate 412, and a limit protrusion 413 is arranged on the edge of the plate surface of the sealing plate 412 facing the rainwater drain pipe 40, and the limit protrusion 413 is used to The sewage intercepting plate 41 rotating around the hinge seat 402 is used to limit the position, so that the sealing plate 412 is rotated to the pipe mouth of the rainwater drain pipe 40 to close the rainwater drain pipe 40, and a float 42 is fixedly arranged on the plate surface of the sealing plate 412 facing away from the rainwater drain pipe 40; the upper section of the sewage intercepting plate 41 is arranged as a circular hole-shaped drainage window 414, and the upper end of the drainage window 414 is arranged with a second limiting groove 415, and the second and first limiting grooves 415 and 401 have the same structure, and both are arranged directly below the upper section of the connecting rod 34.
[0046] like Figure 3 As shown, the upper and lower ends of the pipe mouth of the rainwater drain pipe 40 are respectively provided with a first limiting groove 401 and a hinge seat 402, and the hinge seat 402 is hingedly provided with a sewage interception plate 41, and the sewage interception plate 41 is arranged in an "8" shape: a hinge hole 411 hinged to the hinge seat 402 is arranged in the center of the sewage interception plate 41; the lower section of the sewage interception plate 41 is arranged as a circular sealing plate 412, and a limiting protrusion 413 is arranged on the edge of the plate surface of the sealing plate 412 facing the rainwater drain pipe 40, and the limiting protrusion 413 is used to limit the position of the sewage interception plate 41 rotating around the hinge seat 402, so that the rainwater drain pipe 40 is closed when the sealing plate 412 is rotated to the pipe mouth of the rainwater drain pipe 40, and a float 42 is fixedly arranged on the plate surface of the sealing plate 412 facing away from the rainwater drain pipe 40, and the float 42 and the limiting protrusion 413 are respectively arranged on both sides of the vertical central axis of 412.
[0047] like Figure 4 As shown, the upper section of the sewage intercepting plate 41 is configured as a circular hole-shaped discharge window 414, and a second limit slot 415 is provided at the upper end of the discharge window 414. The second and first limit slots 415 and 401 have the same structure and are both arranged directly below the upper section of the connecting rod 34.
[0048] Embodiment 2:
[0049] The difference between this embodiment and the first embodiment is that:
[0050] like Figure 6As shown, a torsion spring connecting seat 35 is fixedly provided on the outer wall of the lower end outlet of the elbow 31 provided on the combined rainwater and sewage inlet pipe 30, and a circular drain plate 36 is fixedly provided on the other torque arm of the torsion spring connecting seat 35. A sewage discharge hole 37 deviating from the center of the drain plate 36 is penetrated on the plate surface of the drain plate 36.
[0051] Combined with the specific structure of a rainwater and sewage well anti-backflow and sewage interception device in the above implementation, a rainwater and sewage well anti-backflow and sewage interception device is further described below:
[0052] A. Sewage discharge stage: In this process, no rainwater enters the rainwater and sewage well from the rainwater and sewage combined inlet pipe 30, and the sewage interception valve 11 is in an open state:
[0053] ① When the sewage inflow is normal, the sewage flows along the sewage discharge direction a, and the sewage in the rainwater and sewage well is discharged to the sewage treatment end through the sewage discharge pipe (10);
[0054] ② When the sewage inflow is too large, the sewage level in the rainwater and sewage well rises, and the float 42 rises with the water level. The sewage intercepting plate 41 rotates around the hinge seat 402 / hinge hole 411, so that the sealing plate 412 rotates until the limiting protrusion 413 provided on the edge of the plate surface is stuck to the pipe mouth of the rainwater drainage pipe 40. The sealing plate 412 blocks the pipe mouth of the rainwater drainage pipe 40 to prevent sewage from entering the rainwater drainage pipe 40. At the same time, the high water level sewage in the rainwater and sewage well increases the pressure at the bottom of the rainwater and sewage well, thereby increasing the sewage discharge of the sewage drainage pipe 10 and reducing the sewage inlet pipe 20.
[0055] B. Rain drainage stage:
[0056] ① A large amount of rainwater enters the rainwater and sewage well from the rainwater and sewage combined inlet pipe 30. The elbow 31 provided on the rainwater and sewage combined inlet pipe 30 makes the rainwater flush the water flushing plate 14 downward and move downward, that is, one end of the water flushing plate 14 of the lever 13 moves downward; the other end of the lever 13 moves upward and closes the sewage interception valve 11 to prevent sewage from being discharged from the sewage discharge pipe 10;
[0057] ②, during the downward movement of the water flushing disc 14, the straight rod 15 provided between the water flushing discs 14 drives the connecting rod 34 to move downward. At the same time, the connecting rod 34 only moves vertically downward under the limitation of the vertical slide seat 33, and the other end of the connecting rod 34 is inserted into the first and second limit slots 401 and 415. At this time, even if the water level of the rainwater and sewage well rises, the sewage intercepting plate 41 cannot rotate around the hinge seat 402 / hinged hole 411, and the rainwater in the rainwater and sewage well flows along the rainwater discharge direction b through the discharge window 414 and is discharged from the rainwater discharge pipe 40;
[0058] ③. When the initial rainwater enters, due to the small amount of rainfall, the water flow cannot flush the dynamic water flushing plate 14. At this time, the sewage interception valve 11 is in the open state, and the rainwater is discharged from the sewage pipe 10. The specific process refers to step ② in the sewage discharge stage of step A.
[0059] Based on the above, the embodiment of the rainwater and sewage well anti-backflow and sewage interception device and its working method of the present invention is inspired. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A rainwater and sewage well backflow prevention and sewage interception device, wherein a rainwater and sewage combined inlet pipe (30) and a rainwater discharge pipe (40) are arranged relatively in the rainwater and sewage well, and a sewage discharge pipe (10) is staggeredly arranged below the rainwater and sewage combined inlet pipe (30) and the rainwater discharge pipe (40), characterized in that: The sewage discharge pipe (10) is provided with a sewage interception valve (11), the sewage interception valve (11) comprising a valve body (111) sealedly connected to the sewage discharge pipe (10), the upper end of the valve body (111) being sealedly provided with a sealing gland (112), the center of the sealing gland (112) being sealed and slidably provided with a valve stem (113), the upper end of the valve stem (113) being hinged to the lever (13), a limit plate (114) being fixedly provided in the middle of the valve stem (113), and a resetting sleeve being provided on the valve stem (113). A tension spring (115), the upper and lower ends of the reset tension spring (115) are respectively fixedly connected to the limit plate (114) and the sealing gland (112); a vertical support rod (12) is fixedly arranged on the outer wall of the sewage discharge pipe (10); a lever (13) is hingedly arranged at the upper top of the support rod (12); one end of the lever (13) is connected to the stroke end of the sewage interception valve (11); the other end of the lever (13) is provided with a multi-layer water flushing disc (14); and a straight rod (15) is connected between the water flushing discs (14); The end of the combined rainwater and sewage inlet pipe (30) is connected to an elbow (31), the outlet end of the elbow (31) is downwardly arranged just above the water flushing plate (14), a support frame (32) is fixedly arranged on the outer wall of the elbow (31) away from the combined rainwater and sewage inlet pipe (30), a vertical slide seat (33) is arranged at the end of the support frame (32), a connecting rod (34) is slidably arranged in the vertical slide seat (33), and the connecting rod (34) is arranged in a "Z" shape: The end of the lower section of the connecting rod (34) is fixedly connected to the straight rod (15), and the end of the upper section of the connecting rod (34) is hingedly provided with a movable rod (341). A spring (343) is sleeved at the hinge between the connecting rod (34) and the movable rod (341). A fixing sleeve (342) is fixedly provided at one end of the spring (343) close to the connecting rod (34). The fixing sleeve (342) is fixedly sleeved on the connecting rod (34). The lower end of the connecting rod (34) is fixedly connected to the straight rod (15); The upper and lower ends of the rainwater drainage pipe (40) at the pipe mouth are respectively provided with a first limit slot (401) and a hinge seat (402); a sewage interception plate (41) is hingedly provided on the hinge seat (402); the sewage interception plate (41) is arranged in an "8" shape: a hinge hole (411) hingedly connected to the hinge seat (402) is arranged in the center of the sewage interception plate (41); the lower section of the sewage interception plate (41) is arranged as a circular sealing plate (412); a limit protrusion (413) is arranged on the edge of the plate surface of the sealing plate (412) facing the rainwater drainage pipe (40); the limit protrusion (413) is used to The position of the sewage intercepting plate (41) rotating around the hinge seat (402) is limited so that the rainwater drain pipe (40) is closed when the sealing plate (412) rotates to the pipe mouth of the rainwater drain pipe (40). A float (42) is fixedly arranged on the plate surface of the sealing plate (412) facing away from the rainwater drain pipe (40); the upper section of the sewage intercepting plate (41) is arranged as a circular hole-shaped drainage window (414), and the upper end of the drainage window (414) is arranged with a second limiting groove (415). The second and first limiting grooves (415, 401) have the same structure and are arranged directly below the upper section of the connecting rod (34).
2. A rainwater and sewage well backflow prevention and sewage interception device according to claim 1, characterized in that: A horizontal hanging column is arranged at the top end of the valve stem (113); a long strip-shaped through slot is penetrated through the end of the lever (13) away from the water flushing plate (14); and the hanging column is movably inserted into the through slot.
3. A sewage interception device for preventing backflow of rainwater and sewage wells according to claim 1, characterized in that: The limiting protrusion (413) and the buoy (42) are respectively arranged on two sides of the vertical central axis (412).
4. A rainwater and sewage well backflow prevention and sewage interception device according to claim 1, characterized in that: A torsion spring connection seat (35) is fixedly provided on the outer wall of the lower end outlet of the elbow (31) provided on the combined rainwater and sewage inlet pipe, a circular drainage plate (36) is fixedly provided on the other torque arm of the torsion spring connection seat (35), and a drainage hole (37) deviating from the center of the drainage plate (36) is penetrated on the plate surface of the drainage plate (36).
5. The working method of the sewage well backflow prevention and interception device according to claim 1 is characterized in that: A. Sewage discharge stage: In this process, no rainwater enters the rainwater and sewage well from the rainwater and sewage combined inlet pipe (30), and the sewage interception valve (11) is in an open state: ①. When the sewage inflow is normal, the sewage flows along the sewage discharge direction (a), and the sewage in the rainwater sewage well is discharged from the sewage discharge pipe (10); ② When the sewage inflow is too large, the sewage water level in the rainwater and sewage well rises, and the float (42) rises with the water level. The sewage intercepting plate (41) rotates around the hinge seat (402) / hinge hole (411), so that the sealing plate (412) rotates until the limiting protrusion (413) provided on the edge of the plate surface is clamped to the pipe mouth of the rainwater drainage pipe (40). The sealing plate (412) blocks the pipe mouth of the rainwater drainage pipe (40) to prevent sewage from entering the rainwater drainage pipe (40). At the same time, the high water level sewage in the rainwater and sewage well increases the pressure at the bottom of the rainwater and sewage well, thereby increasing the sewage discharge volume of the sewage drainage pipe (10); B. Rain drainage stage: ① A large amount of rainwater enters the rainwater and sewage well from the rainwater and sewage combined inlet pipe (30). The elbow (31) provided on the rainwater and sewage combined inlet pipe (30) causes the rainwater to flush the water flushing plate (14) downward and move downward, that is, one end of the water flushing plate (14) of the lever (13) moves downward; the other end of the lever (13) moves upward and closes the sewage interception valve (11) to prevent sewage from being discharged from the sewage discharge pipe (10); ②, during the downward movement of the water flushing disc (14), the straight rod (15) provided between the water flushing discs (14) drives the connecting rod (34) to move downward. At the same time, the connecting rod (34) only moves vertically downward under the limitation of the vertical slide seat (33), and the other end of the connecting rod (34) is inserted into the first and second limit slots (401, 415). At this time, even if the water level of the rainwater and sewage well rises, the sewage intercepting plate (41) cannot rotate around the hinge seat (402) / hinged hole (411), and the rainwater in the rainwater and sewage well flows through the drainage window (414) along the rainwater drainage direction (b) and is discharged from the rainwater drainage pipe (40); ③. When rainwater enters at the initial stage, the water flow cannot flush the dynamic water flushing plate (14) due to the small amount of rainwater. At this time, the sewage interception valve (11) is in an open state, and the rainwater is discharged from the sewage discharge pipe (10).