A smart city drainage system based on the Internet of Things

Abstract

The present invention relates to the field of urban drainage, and in particular to a smart city drainage system based on the Internet of Things. The technical problem to be solved is: when the existing anti-backflow device is located in the middle and lower part of the device at the river tide level, the anti-backflow device needs to be closed in time to prevent the river water from backflowing, thereby causing sewage accumulation in the pipe. At the same time, the anti-backflow device after being submerged in the river is prone to aging and deformation, resulting in the water outlet of the anti-backflow device not being tightly sealed. The technical solution of the present invention is: a smart city drainage system based on the Internet of Things, including a drainage pipe and an anti-backflow body, etc.; an anti-backflow body for preventing water backflow is installed on the left side of the drainage pipe, and the anti-backflow body is made of rubber. The present invention realizes that the extrusion block is driven up and down by the anti-backflow head to control the opening and closing of the upper opening on the left side of the anti-backflow body, thereby effectively alleviating the accumulation of rainwater in the city, and at the same time providing sufficient time for the staff to make timely adjustments to the urban drainage system.

Description

Technical Field

[0001] The present invention relates to the field of urban drainage, and in particular to a smart urban drainage system based on the Internet of Things. Background Art

[0002] The urban drainage system is an engineering facility system for treating and discharging urban sewage and rainwater, and is an integral part of urban public facilities. In the prior art, flap gates are often installed at the tail end of drainage pipes near rivers, and flap gates are mainly used to prevent river tides from flowing back into drainage pipes. The Chinese patent with application number CN202010388277.1, an urban drainage system, uses the door cover to push the top rod, reduce the rotation speed of the door cover, reduce the rigid impact of the door body; reduce the wear of the sealing ring, and then increase the sealing of the door cover and the door body. However, when the river tide level gradually rises, the drainage system needs to be closed in time to prevent the river water from flowing back, so that the drainage pipe cannot continue to drain outward, resulting in the accumulation of sewage in the pipe, overflowing from the urban drainage outlet to the surrounding roads, causing urban waterlogging.

[0003] At the same time, since the existing anti-backflow device is partially made of rubber material, and after the river water submerges the anti-backflow device, the anti-backflow device gradually ages and deforms over time, resulting in the water outlet of the anti-backflow device being not tightly sealed, thereby failing to prevent the river water from backflowing, affecting the use effect of the anti-backflow device. Summary of the invention

[0004] In order to overcome the shortcomings of the existing backflow prevention device that when the river tide level is located in the lower middle part of the device, the backflow prevention device needs to be closed in time to prevent the river water from backflowing, thereby causing sewage accumulation in the pipe, and the backflow prevention device is prone to aging and deformation after being immersed in the river, resulting in the water outlet of the backflow prevention device being not tightly sealed, the present invention provides a smart city drainage system based on the Internet of Things.

[0005] The technical solution of the present invention is: a smart city drainage system based on the Internet of Things, including a drainage pipe; also including a backflow prevention body, a backflow prevention head, an extrusion block, a water level sensor and a pressing system; an backflow prevention body for preventing water backflow is installed on the left side of the drainage pipe, and the backflow prevention body is made of rubber; the backflow prevention body is arranged in a trumpet shape tilted to the left, and two upper and lower openings for drainage are opened on the left side of the backflow prevention body; an backflow prevention head is arranged on the right side of the backflow prevention body, which moves up and down to control the opening and closing of the upper opening; an extrusion block for squeezing the backflow prevention body is installed on the upper side of the backflow prevention head, and the extrusion block is located at the upper opening; a pressing system for closing the lower opening is installed in the drainage pipe.

[0006] More preferably, a water level sensor is further included; a water level sensor for sensing the change of water level in the backflow prevention device is arranged on the upper side of the drainage pipe.

[0007] More preferably, a one-way valve is also included; a plurality of limit holes are provided on the head of the backflow preventer, and the limit holes are distributed in a trapezoidal shape on the head of the backflow preventer as viewed from right to left; a one-way valve that can only be opened to the left is fixed in each limit hole.

[0008] More preferably, the limiting hole is arranged to be inclined downward.

[0009] More preferably, it also includes a fixed rod, a first connecting rod, an elastic member and a cylindrical tube; a fixed rod is fixedly connected in the drainage pipe, and the fixed rod passes through the anti-backflow head; a first connecting rod is slidably connected to the fixed rod, and the first connecting rod is fixedly connected to the extrusion block; two elastic members are fixedly connected to the lower side of the first connecting rod; the anti-backflow head is movably connected to the first connecting rod through the two elastic members; a cylindrical tube is fixedly connected to the anti-backflow head, and the cylindrical tube is sleeved on the fixed rod; the anti-backflow head slides up and down on the fixed rod through the cylindrical tube.

[0010] More preferably, the pressing system includes a second connecting rod, a first guide plate, a first airbag, an air pipe, an arc plate and a second airbag; a plurality of second connecting rods are fixedly connected to the right side of the anti-backflow device head; a first guide plate is commonly fixedly connected to the right side of all the second connecting rods, and the right side of the first guide plate is rotatably connected to a round rod; a first airbag is fixedly connected to the lower side of the first guide plate, and the lower side of the first airbag is fixedly connected to the inner wall of the drainage pipe through a round plate; a telescopic air pipe for transmitting gas is connected to the left side of the first airbag; a arc plate for pressing the lower opening of the left side of the anti-backflow device body is fixedly connected to the left side of the anti-backflow device body; a second airbag is fixedly connected between the lower side of the arc plate and the anti-backflow device body.

[0011] More preferably, the first guide plate is configured to be arc-shaped.

[0012] More preferably, a diverter plate is further included; the diverter plate is fixedly connected to the left side of the first guide plate, and the diverter plate is arranged in a herringbone shape.

[0013] More preferably, a stopper is further included; the stopper is fixedly connected to the head of the backflow preventer, and the stopper covers the lower row of one-way valves on the head of the backflow preventer.

[0014] More preferably, a second guide plate is further included; the second guide plate is fixedly connected to the upper opening on the left side of the backflow prevention body, and the second guide plate is located below the extrusion block; the second guide plate is arranged in a curved shape that is concave to the right.

[0015] The beneficial effect is that the present invention realizes that the extrusion block is driven to move up and down by the backflow prevention device head, and the upper opening on the left side of the backflow prevention device body is controlled to open and close, thereby effectively alleviating the accumulation of rainwater in the city, and at the same time providing sufficient time for the staff to make timely adjustments to the urban drainage system;

[0016] The water level sensor can sense the water level changes in the backflow prevention device in real time and transmit the data to the staff, so that the staff can make timely adjustments to the urban drainage to prevent serious casualties and financial losses.

[0017] The one-way valve rotates to the left to ensure that after the rain stops, as the water level drops, the rainwater accumulated in the drainage pipe is quickly discharged, further improving the efficiency of urban rainwater discharge, so that urban roads can be restored in time to ensure the normal operation of traffic;

[0018] The limiting hole is set to be inclined downward to increase the water flow velocity, and at the same time facilitate the discharge of water flow, so that floating garbage is more easily carried to the river by the water flow;

[0019] The second airbag expands to squeeze the left side of the arc plate downward to prevent the backflow prevention device body, so that the lower opening on the left side of the backflow prevention device body is as close to the inner wall of the drainage pipe as possible, thereby preventing the lower opening on the left side of the backflow prevention device body from being loosely sealed, causing river water to flow back, and avoiding urban waterlogging;

[0020] The water flow in the drainage pipe is guided by the first guide plate so that the water flows out from the limiting hole to the left, thereby effectively preventing garbage from accumulating in the anti-backflow device body and preventing the anti-backflow device body from being unable to operate normally;

[0021] The water flow impacted by the first guide plate is concentrated to flow to the one-way valve through the diverter plate, thereby effectively increasing the amount of water sprayed from the one-way valve, and then increasing the impact force of the water flow sprayed from the one-way valve, effectively improving the garbage removal effect;

[0022] The water flow on the first guide plate is temporarily concentrated by the block, so that the water flow comes up along the first guide plate and impacts the backflow prevention device head, preventing the water flow from being dispersed, reducing the impact flow rate, and preventing the water flow from being unable to spray out from the one-way valve;

[0023] The floating garbage is blocked outside the backflow prevention device body by the second drainage plate, thereby effectively reducing the accumulation of floating garbage in the backflow prevention device body and further avoiding affecting the normal operation of the backflow prevention device body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the smart city drainage system based on the Internet of Things of the present invention;

[0025] Figure 2 is a cross-sectional view of the present invention;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of the backflow prevention body, the backflow prevention head and the extrusion block combination of the present invention;

[0027] Figure 4 It is a combined cross-sectional view of the backflow prevention body and the backflow prevention head of the present invention;

[0028] Figure 5 It is a partial three-dimensional structural schematic diagram of the present invention;

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the one-way valve of the present invention;

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the pressing system of the present invention;

[0031] Figure 8 is a cross-sectional view of the pressing system of the present invention;

[0032] Fig. 9 It is a schematic diagram of a partial three-dimensional structure of the pressing system of the present invention;

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the diverter plate and the stopper combination of the present invention;

[0034] Fig.11 It is a schematic diagram of the three-dimensional structure of the second guide plate of the present invention.

[0035] In the accompanying drawings: 1-drainage pipe, 2-anti-backflow body, 3-anti-backflow head, 3001-limiting hole, 4-extrusion block, 5-water level sensor, 6-check valve, 101-fixing rod, 102-first connecting rod, 103-elastic member, 104-cylindrical tube, 201-second connecting rod, 202-first guide plate, 203-first air bag, 204-trachea, 205-arc plate, 206-second air bag, 301-diverter plate, 302-block, 401-second guide plate. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] like Figure 3-Figure 6 As shown, a smart city drainage system based on the Internet of Things includes a drainage pipe 1;

[0039] It also includes an anti-backflow body 2, an anti-backflow head 3, an extrusion block 4, a water level sensor 5 and a pressing system; the anti-backflow body 2 is installed on the left side of the drainage pipe 1, and the anti-backflow body 2 is made of rubber; the anti-backflow body 2 is arranged in a trumpet shape tilted to the left, and two upper and lower openings are opened on the left side of the anti-backflow body 2; the anti-backflow head 3 is arranged on the right side of the anti-backflow body 2; the extrusion block 4 is installed on the upper side of the anti-backflow head 3, and the extrusion block 4 is located at the upper opening; a pressing system is installed in the drainage pipe 1; under normal circumstances, urban rainwater flows through the drainage pipe 1 to the lower side of the anti-backflow body 2, and through the squeezing of the water flow, the lower opening on the left side of the anti-backflow body 2 protrudes upward, and the opening Open, and then rainwater flows out into the river through the lower opening on the left side of the anti-backflow device body 2. When it rains heavily in the city, the drainage in the city is tight. At the same time, after the river rises, the water flows into the anti-backflow device body 2, causing the anti-backflow device body 2 to deform, and the anti-backflow device body 2 gradually tilts downward. At this time, the lower opening on the left side of the anti-backflow device body 2 is squeezed by the water flow and closed, and the rainwater discharged from the city gradually accumulates in the drainage pipe 1, and the water flow height gradually rises to the upper opening on the left side of the anti-backflow device body 2. At the same time, due to the gradual accumulation of water on the left side of the anti-backflow device body 2, the anti-backflow device body 2 is deformed, which drives the anti-backflow device head 3 to move downward, and then the squeezing block 4 moves downward, which is effective in preventing backflow. The upper left opening of the device body 2 is squeezed, and the upper left opening is sunken downward, and the upper left opening of the anti-backflow device body 2 is opened, and then the rainwater accumulated in the drainage pipe 1 is discharged from the upper left opening of the anti-backflow device body 2. When the rainfall gradually increases and the river rises rapidly, and gradually submerges the drainage pipe 1, the water in the river gradually flows into the anti-backflow device body 2, and the upper left opening of the anti-backflow device body 2 is squeezed by the water flow and gradually closes. At the same time, the state of the anti-backflow device body 2 is gradually restored, and the anti-backflow device head 3 is driven to return to its original position. When the upper left opening of the anti-backflow device body 2 is completely closed, the water in the river cannot flow back into the drainage pipe 1. The process is realized, so as to achieve drainage to the greatest extent when heavy rainfall occurs in the city, thereby effectively alleviating urban waterlogging. The existing technology only relies on one drain outlet for drainage. When the river rises and the drain outlet is closed, the rainwater in the city cannot be discharged smoothly, which can easily lead to urban waterlogging. The extrusion block 4 is driven up and down by the anti-backflow head 3 to control the opening on the left side of the anti-backflow body 2 to open and close. When the drain outlet on the lower side of the anti-backflow body 2 is closed, the rainwater will flow out through the upper opening on the left side of the anti-backflow body 2, thereby effectively alleviating the accumulation of rainwater in the city and providing the staff with enough time to make timely adjustments to the urban drainage system.

[0040] It also includes a water level sensor 5; a water level sensor 5 is arranged on the upper side of the drainage pipe 1; the water level change in the anti-backflow device body 2 is sensed in real time by the water level sensor 5, and the data is transmitted to the staff, so that the staff can make timely adjustments to the urban drainage to prevent serious casualties and financial losses.

[0041] The backflow prevention device head 3 is provided with four limiting holes 3001, and the limiting holes 3001 are distributed in a trapezoidal shape on the backflow prevention device head 3 when viewed from right to left; a one-way valve 6 is fixedly connected in each limiting hole 3001; when the rain stops, the water level of the river gradually decreases, and at the same time, the water in the backflow prevention device body 2 gradually recedes with the river, and the pressure above the backflow prevention device body 2 gradually decreases, so that the backflow prevention device body 2 gradually tilts downward, thereby driving the backflow prevention device head 3 to move downward, and then the backflow prevention device body 2 gradually decreases. The upper opening on the left side of the irrigation device body 2 is opened, and water flows into the river on the left side through the upper opening. As the water flow is discharged, the anti-backflow device body 2 gradually returns to its original state. At the same time, when the water pressure on the right side of the anti-backflow device head 3 is greater than the water pressure on the left side, and the water level on the right side is higher than the one-way valve 6, the water flows through the one-way valve 6 and is discharged into the river on the left side, thereby ensuring that after the rain stops, as the water level decreases, the rainwater accumulated in the drainage pipe 1 is quickly discharged, further improving the efficiency of urban rainwater discharge, and then enabling urban roads to be restored in time to ensure the normal operation of traffic.

[0042] The limiting hole 3001 is set to be inclined downward; when the water in the drainage pipe 1 flows out from the limiting hole 3001 of the backflow prevention device head 3, the water flow velocity is effectively increased, and the water flow is conveniently discharged, so that the floating garbage is more easily carried to the river direction by the water flow.

[0043] It also includes a fixed rod 101, a first connecting rod 102, an elastic member 103 and a cylindrical tube 104; the fixed rod 101 is fixedly connected in the drainage pipe 1, and the fixed rod 101 passes through the anti-backflow device head 3; the first connecting rod 102 is slidably connected to the fixed rod 101, and the first connecting rod 102 is fixedly connected to the extrusion block 4; two elastic members 103 are fixedly connected to the lower side of the first connecting rod 102, and the elastic member 103 is a spring; the anti-backflow device head 3 is movably connected to the first connecting rod 102 through the two elastic members 103; the anti-backflow device A cylindrical tube 104 is fixedly connected to the head 3, and the cylindrical tube 104 is sleeved on the fixed rod 101; the backflow preventer head 3 slides up and down on the fixed rod 101 through the cylindrical tube 104. When the backflow preventer body 2 is deformed, the backflow preventer drives the elastic member 103 to move up and down. When the elastic member 103 is compressed or stretched to the extreme, it drives the first connecting rod 102 to move up and down, and then drives the extrusion block 4 to squeeze the upper opening on the left side of the anti-backflow body 2, thereby controlling the opening and closing of the upper opening on the left side of the anti-backflow body 2.

[0044] Example 2

[0045] On the basis of Example 1, Figure 7-10As shown, the pressing system includes a second connecting rod 201, a first guide plate 202, a first air bag 203, an air pipe 204, an arc plate 205 and a second air bag 206; at least two second connecting rods 201 symmetrically distributed front and back are fixedly connected to the right side of the anti-backflow head 3; a first guide plate 202 is commonly fixedly connected to the right side of all the second connecting rods 201, and the right side of the first guide plate 202 is rotatably connected to a round rod; a first air bag 203 is fixedly connected to the lower side of the first guide plate 202, and the lower side of the first air bag 203 is fixedly connected to the inner wall of the drainage pipe 1 through a round plate; the air pipe 204 is connected to the left side of the first air bag 203; an arc plate 205 is fixedly connected to the left side of the anti-backflow body 2; a second air bag 206 is fixedly connected between the lower side of the arc plate 205 and the anti-backflow body 2; when the anti-backflow body 2 tilts downward to produce deformation, the anti-backflow The lower opening on the left side of the body 2 is very easy to open, which causes the water in the river to enter the drainage pipe 1 through the lower opening, causing urban waterlogging. Therefore, when the anti-backflow device head 3 moves downward, it drives the first guide plate 202 to move downward. At this time, the gas in the first airbag 203 is compressed and enters the second airbag 206 through the air pipe 204. The second airbag 206 gradually expands, causing the right side of the arc plate 205 to tilt upward for a certain distance, and then the left side of the arc plate 205 presses the lower opening on the left side of the anti-backflow device body 2 downward, so that the lower opening on the left side of the anti-backflow device body 2 is tightly attached to the inner wall of the drainage pipe 1, and at the same time, the lower side of the anti-backflow device body 2 is squeezed to deform downward, so that the lower opening on the left side of the anti-backflow device body 2 is as close to the inner wall of the drainage pipe 1 as possible, thereby preventing the lower opening on the left side of the anti-backflow device body 2 from being loosely closed, causing river water to flow back, and avoiding urban waterlogging.

[0046] The first guide plate 202 is set in an arc shape. When the river water recedes, the backflow prevention head 3 gradually moves upward and drives the left side of the first guide plate 202 to move upward. At this time, the volume in the first airbag 203 gradually recovers and the pressure decreases. At this time, the pressure in the second airbag 206 is greater than the pressure in the first airbag 203. Therefore, the gas entering the second airbag 206 flows back to the first airbag 203 through the air pipe 204 until the pressure in the first airbag 203 is equal to that in the second airbag 206. At the same time, the first airbag 203 gradually recovers to its original state until the left side of the first guide plate 202 The height is lower than the one-way valve 6, and the right side of the first guide plate 202 contacts the rainwater discharged to the left in the drainage pipe 1. Due to the high drainage flow rate, the discharged water flows through the first guide plate 202 to impact the one-way valve 6, thereby opening the one-way valve 6, and then spraying to the left in the limiting hole 3001, so that the floating garbage accumulated in the anti-backflow body 2 due to the river flooding floats out to the left. At the same time, the floating garbage is brought out of the anti-backflow body 2 by utilizing the flow direction of the river water, thereby effectively avoiding the accumulation of garbage in the anti-backflow body 2, and preventing the anti-backflow body 2 from failing to operate normally.

[0047] It also includes a diverter plate 301; the diverter plate 301 is fixedly connected to the left side of the first guide plate 202, and the diverter plate 301 is arranged in a herringbone shape; the water flow that impacts the first guide plate 202 is concentrated to flow to the one-way valve 6 through the diverter plate 301, thereby effectively increasing the amount of water sprayed from the one-way valve 6, and then increasing the impact force of the water sprayed from the one-way valve 6, effectively improving the garbage removal effect.

[0048] It also includes a block 302; the block 302 is fixedly connected to the backflow preventer head 3, and the block 302 covers the lower row of one-way valves 6 on the backflow preventer head 3; the water flow on the first guide plate 202 is temporarily concentrated by the block 302, so that the water flow comes up along the first guide plate 202 and then impacts the backflow preventer head 3, preventing the water flow from being dispersed, reducing the impact flow rate, and preventing the water flow from being unable to spray out from the one-way valve 6.

[0049] Example 3

[0050] On the basis of Example 2, Figure 1 , Figure 2 and Fig.11 As shown, it also includes a second guide plate 401; the second guide plate 401 is fixedly connected to the upper opening on the left side of the anti-backflow body 2, and the second guide plate 401 is located below the extrusion block 4; the second guide plate 401 is set to be curved and concave to the right; when the extrusion block 4 squeezes the upper opening on the left side of the anti-backflow body 2, the upper opening on the left side of the anti-backflow body 2 is concave downward, driving the second guide plate 401 to move downward, so that when the river rises, the anti-backflow body 2 gradually rises, and the water level gradually contacts the second guide plate 401. Since the second guide plate 401 is set to be curved and concave to the right, at this time, according to the flow direction of the river, most of the floating garbage carried by the river is blocked outside the anti-backflow body 2 through the second guide plate 401, and floats away with the water flow, thereby effectively reducing the accumulation of floating garbage in the anti-backflow body 2, and further avoiding affecting the normal operation of the anti-backflow body 2.

[0051] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. A smart city drainage system based on the Internet of Things, comprising a drainage pipe (1); characterized in that: It also includes an anti-backflow body (2), an anti-backflow head (3), a squeezing block (4), a water level sensor (5) and a pressing system; the anti-backflow body (2) for preventing water backflow is installed on the left side of the drainage pipe (1), and the anti-backflow body (2) is made of rubber; the anti-backflow body (2) is arranged in a trumpet shape tilted to the left, and two upper and lower openings for drainage are opened on the left side of the anti-backflow body (2); the anti-backflow head (3) is arranged on the right side of the anti-backflow body (2) and is movable to control the opening and closing of the upper opening; the squeezing block (4) for squeezing the anti-backflow body (2) is installed on the upper side of the anti-backflow head (3), and the squeezing block (4) is located at the upper opening; the pressing system for closing the lower opening is installed in the drainage pipe (1); Urban rainwater flows through the drainage pipe (1) to the lower side of the backflow prevention device body (2), and is squeezed by the water flow so that the lower opening on the left side of the backflow prevention device body (2) protrudes upward, and the opening is opened; The water flows into the backflow prevention device body (2), causing the backflow prevention device body (2) to deform, and the backflow prevention device body (2) gradually tilts downward. At this time, the lower opening on the left side of the backflow prevention device body (2) is squeezed by the water flow and closed; The squeezing block (4) moves downward to squeeze the left upper opening of the backflow prevention body (2), so that the left upper opening is sunken downward and the left upper opening of the backflow prevention body (2) is opened; The water flow in the river gradually flows into the backflow prevention device body (2), and the upper opening on the left side of the backflow prevention device body (2) is squeezed by the water flow and gradually closes.

2. According to the smart city drainage system based on the Internet of Things according to claim 1, it is characterized by: It also includes a water level sensor (5); the water level sensor (5) for sensing the change of the water level in the anti-backflow device body (2) is arranged on the upper side of the drainage pipe (1).

3. According to the smart city drainage system based on the Internet of Things according to claim 1, it is characterized by: The device also includes a one-way valve (6); a plurality of limit holes (3001) are provided on the backflow prevention device head (3); the limit holes (3001) are distributed in a trapezoidal shape on the backflow prevention device head (3) when viewed from right to left; and a one-way valve (6) that can only be opened to the left is fixedly connected to each limit hole (3001).

4. According to the smart city drainage system based on the Internet of Things as claimed in claim 3, it is characterized by: The limiting hole (3001) is arranged to be inclined downward.

5. The smart city drainage system based on the Internet of Things according to claim 1 is characterized by: The device also comprises a fixed rod (101), a first connecting rod (102), an elastic member (103) and a cylindrical tube (104); the fixed rod (101) is fixedly connected inside the drainage pipe (1), and the fixed rod (101) passes through the backflow prevention device head (3); the first connecting rod (102) is slidably connected to the fixed rod (101), and the first connecting rod (102) is fixedly connected to the extrusion block (4); two elastic members (103) are fixedly connected to the lower side of the first connecting rod (102); the backflow prevention device head (3) is movably connected to the first connecting rod (102) via the two elastic members (103); the cylindrical tube (104) is fixedly connected to the backflow prevention device head (3), and the cylindrical tube (104) is sleeved on the fixed rod (101); the backflow prevention device head (3) slides up and down on the fixed rod (101) via the cylindrical tube (104).

6. The smart city drainage system based on the Internet of Things according to claim 1 is characterized by: The pressing system comprises a second connecting rod (201), a first guide plate (202), a first air bag (203), an air pipe (204), an arc plate (205) and a second air bag (206); a plurality of second connecting rods (201) are fixedly connected to the right side of the backflow prevention device head (3); a first guide plate (202) is commonly fixedly connected to the right side of all the second connecting rods (201), and the right side of the first guide plate (202) is rotatably connected to a round rod; the first guide plate (2 02) is fixedly connected to the lower side of a first airbag (203), and the lower side of the first airbag (203) is fixedly connected to the inner wall of the drainage pipe (1) via a circular plate; the left side of the first airbag (203) is connected to a telescopic air pipe (204) for transmitting gas; the left side of the anti-backflow device body (2) is fixedly connected to an arc plate (205) for pressing the lower opening of the left side of the anti-backflow device body (2); and a second airbag (206) is fixedly connected between the lower side of the arc plate (205) and the anti-backflow device body (2).

7. The smart city drainage system based on the Internet of Things according to claim 6 is characterized by: The first guide plate (202) is configured to be arc-shaped.

8. The smart city drainage system based on the Internet of Things according to claim 6 is characterized by: It also includes a flow divider plate (301); the flow divider plate (301) is fixedly connected to the left side of the first flow guide plate (202), and the flow divider plate (301) is arranged in a herringbone shape.

9. The smart city drainage system based on the Internet of Things according to claim 3 is characterized by: It also includes a stopper (302); the stopper (302) is fixedly connected to the backflow prevention device head (3), and the stopper (302) covers the lower row of one-way valves (6) on the backflow prevention device head (3).

10. The smart city drainage system based on the Internet of Things according to claim 1, characterized in that: It also includes a second guide plate (401); the second guide plate (401) is fixedly connected to the upper opening on the left side of the backflow prevention body (2), and the second guide plate (401) is located below the extrusion block (4); the second guide plate (401) is arranged in a curved shape that is concave to the right.

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