A backflow prevention device for a drain

Abstract

The present application relates to the technical fields of building engineering pipeline, and specifically relates to a backflow prevention device for a sewage pipe, which comprises a sewage pipe, a straight pipe penetrating through the sewage pipe, a mounting hole being formed in the sidewall of the straight pipe, an air bag being mounted on the upper portion of the mounting hole, the top end of the air bag being fixedly connected with the upper portion of the mounting hole, a floating ball switch being arranged in the annular space formed between the straight pipe and the sewage pipe, an air inlet pipe and an air outlet pipe being communicated with the upper portion of the air bag, an air pump being communicated with the other end of the air inlet pipe, the air pump and the other end of the air outlet pipe both being located outside the sewage pipe, an air inlet valve being mounted on the air inlet pipe, an air outlet valve being mounted on the air outlet pipe, a control panel being mounted on an operation panel, a green indicator lamp, a red indicator lamp and a starting switch being mounted on the control panel, the floating ball switch, the air pump, the green indicator lamp, the red indicator lamp, the air inlet valve and the air outlet valve all being electrically connected with the control panel. The backflow prevention device for a sewage pipe solves the problem of backflow of the existing sewage pipe and is suitable for the pipeline for conveying or discharging sewage.

Description

Technical Field

[0001] This invention relates to the field of building engineering pipeline technology, specifically a backflow prevention device for sewage pipes. Background Technology

[0002] During the process of discharging sewage into building sewage pipes, backflow is often caused by pipe blockage. This is especially true for sewage pipes used in building drainage systems. Since sewage pipes are interconnected, if one sewage pipe has a problem, it can easily cause backflow in other sewage pipes, resulting in flooding of houses and environmental pollution.

[0003] Therefore, it is necessary to invent a backflow prevention device for sewage pipes to solve the above problems. Summary of the Invention

[0004] To address the problem of backflow in existing sewage pipes, this invention provides a backflow prevention device for sewage pipes.

[0005] This invention is achieved using the following technical solution:

[0006] A backflow prevention device for a sewage pipe includes a sewage pipe with a straight insertion pipe running through it. A flange is fixedly installed at the top of the annular space formed between the straight insertion pipe and the sewage pipe. An installation hole is formed on the side wall of the straight insertion pipe, and an air bladder is installed at the upper part of the installation hole. The top of the air bladder is fixedly connected to the upper part of the installation hole. A float switch is installed in the annular space formed between the straight insertion pipe and the sewage pipe. An air inlet pipe and an air outlet pipe are connected to the upper part of the air bladder. An air pump is connected to the other end of the air inlet pipe, and the other ends of the air pump and the air outlet pipe are both located outside the sewage pipe. An air inlet valve is installed on the air inlet pipe, and an air outlet valve is installed on the air outlet pipe.

[0007] It also includes an operation panel, which is equipped with a controller, a green indicator light, a red indicator light, and a start switch. The float switch, air pump, green indicator light, red indicator light, air inlet valve, and air outlet valve are all electrically connected to the controller; the start switch is electrically connected to the controller.

[0008] Furthermore, an airbag protective cover located inside the straight insertion tube is rotatably mounted on the top of the mounting hole. The surface of the airbag protective cover is in contact with the surface of the airbag, and the airbag protective cover is made of silicone rubber.

[0009] Furthermore, a pressure gauge is installed on the air intake pipe, and the pressure gauge is electrically connected to the controller.

[0010] Furthermore, the inner ring of the flange is fixedly connected to the top of the straight insertion pipe, and the outer ring of the flange is fixedly connected to the top of the sewage pipe.

[0011] Furthermore, the float switch is connected to the controller via a wire; a ring-shaped filter screen is installed at the bottom of the annular space formed between the straight insertion pipe and the sewage pipe, with the inner ring of the filter screen fixedly connected to the outer wall of the straight insertion pipe and the outer ring of the filter screen fixedly connected to the inner wall of the sewage pipe.

[0012] This invention features a reasonable and reliable structural design, achieving the goal of preventing backflow in the sewage pipe. By inflating the air bladder, its volume expands to seal the direct-insertion pipe, preventing sewage backflow and thus preventing backflow. By deflating the air bladder, its volume returns to its original state, without affecting the normal transport of sewage. Furthermore, it is equipped with green and red indicator lights to monitor the backflow situation in the sewage pipe at any time, facilitating timely detection and handling by operators. Additionally, it boasts the advantages of simple structure and convenient operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] In the diagram: 1-drainage pipe, 2-straight insertion pipe, 3-airbag, 4-float switch, 5-inlet pipe, 6-outlet pipe, 7-airbag protective cover, 8-filter screen, 9-wire, 10-green indicator light, 11-red indicator light, 12-controller, 13-air pump. Detailed Implementation

[0015] A backflow prevention device for sewage pipes, as shown in the attached... Figure 1 As shown, the system includes a sewage pipe 1, a straight insertion pipe 2 passing through the sewage pipe 1, a flange fixedly installed at the top of the annular space formed between the straight insertion pipe 2 and the sewage pipe 1, an installation hole on the side wall of the straight insertion pipe 2, an airbag 3 installed at the top of the installation hole, and the top of the airbag 3 fixedly connected to the top of the installation hole. A float switch 4 is installed in the annular space formed between the straight insertion pipe 2 and the sewage pipe 1. An air inlet pipe 5 and an air outlet pipe 6 are connected to the upper part of the airbag 3. An air pump 13 is connected to the other end of the air inlet pipe 5, and the other ends of the air pump 13 and the air outlet pipe 6 are both located outside the sewage pipe 1. An air inlet valve is installed on the air inlet pipe 5, and an air outlet valve is installed on the air outlet pipe 6.

[0016] It also includes an operation panel, on which a controller 12, a green indicator light 10, a red indicator light 11 and a start switch are installed. The float switch 4, the air pump 13, the green indicator light 10, the red indicator light 11, the air inlet valve and the air outlet valve are all electrically connected to the controller 12; the start switch is electrically connected to the controller 12.

[0017] In this invention, the float switch 4 is used to detect whether backflow occurs in the sewage pipe 1. When backflow occurs, the air pump 13 inflates the air bag 3, and the straight insertion pipe 2 is safely sealed by the enlarged air bag 3 to prevent sewage backflow. When the sewage begins to discharge normally, the air bag 3 deflates and returns to its original volume, without affecting the normal discharge of sewage from the sewage pipe 1. The flange is used to connect the sewage pipe 1 to external drainage equipment, and can also seal the upper part of the annular space formed between the straight insertion pipe 2 and the sewage pipe 1 to prevent sewage from flowing back from the annular space. This invention has a simple structure and is easy to operate.

[0018] During normal drainage, the green indicator light 10 on the control panel remains on, indicating that the drain pipe 1 is working normally and there is no backflow.

[0019] When backflow occurs in the sewage pipe 1, the sewage level rises. When the level rises to the position of the float switch 4, the float switch 4 is triggered. After the trigger signal is transmitted to the controller 12, the controller 12 controls the green indicator light 10 to turn off and the red indicator light 11 to stay on. At the same time, it controls the air pump 13 and the air inlet valve to open, and the air bag 3 begins to inflate. As the air bag 3 continues to inflate, the volume of the air bag 3 continues to increase until the volume of the air bag 3 increases to the point that its surface touches the inner wall of the straight insertion pipe 2. At this time, the controller 12 controls the air pump 13 and the air inlet valve to close. At this time, the path of sewage rise has been completely blocked, achieving the purpose of preventing backflow.

[0020] If the sewage level fails to drop, the red indicator light 11 remains constantly lit, continuously alerting staff to the abnormal backflow situation in the sewage pipe 1. When the sewage begins to drop and moves away from the float switch 4, the float switch 4 closes, the controller 12 turns off the red indicator light 11 and keeps the green indicator light 10 constantly lit, and simultaneously controls the vent valve to open, causing the air bag 3 to begin deflating. As the air bag 3 continues to deflate, its volume shrinks back to its original state, without affecting the sewage transport. The vent valve then closes, thus achieving the purpose of preventing backflow in the sewage pipe 1 and solving the backflow problem of the existing sewage pipe 1.

[0021] As attached Figure 1 As shown, an airbag protective cover 7 located inside the straight insertion tube 2 is rotatably installed at the top of the mounting hole. The surface of the airbag protective cover 7 is in contact with the surface of the airbag 3. The airbag protective cover 7 is made of silicone rubber.

[0022] The airbag protective cover 7 can protect the airbag 3 from corrosion and erosion by sewage. When the airbag 3 is inflated, the airbag protective cover 7 will always be attached to the outer surface of the airbag 3 and will be pushed up by the airbag 3. Therefore, the airbag protective cover 7 will not affect the inflation of the airbag 3. When the airbag 3 deflates and returns to its original state, the airbag protective cover 7 will always be attached to the outer surface of the airbag 3 and will fall naturally under the action of gravity. The size of the airbag protective cover 7 matches the size of the mounting hole.

[0023] A pressure gauge is installed on the air intake pipe 5, and the pressure gauge is electrically connected to the controller 12.

[0024] The pressure gauge can detect the pressure of the gas entering the airbag 3. The controller 12 can determine the size of the airbag 3 by the pressure value. Therefore, when the pressure value reaches the preset value, it means that the volume of the airbag 3 has reached the level of blocking the direct insertion tube 2. At this time, the controller 12 can control the air pump 13 and the air intake valve to close.

[0025] The inner ring of the flange is fixedly connected to the top end of the straight insertion pipe 2, and the outer ring of the flange is fixedly connected to the top end of the drain pipe 1.

[0026] The flange is used to connect the sewage pipe 1 to the external drainage equipment, and it can also block the upper part of the annular space formed between the straight pipe 2 and the sewage pipe 1 to prevent sewage from flowing back from the annular space; thus increasing the structural reliability of the device.

[0027] As attached Figure 1 As shown, the float switch 4 is connected to the controller 12 via the wire 9; a ring-shaped filter screen 8 is provided at the bottom of the annular space formed between the straight insertion pipe 2 and the sewage pipe 1. The inner ring of the filter screen 8 is fixedly connected to the outer wall of the straight insertion pipe 2, and the outer ring of the filter screen 8 is fixedly connected to the inner wall of the sewage pipe 1.

[0028] The filter screen 8 can prevent impurities in the sewage from entering the annular space formed between the straight pipe 2 and the sewage pipe 1, ensuring that the device is not affected by impurities during use.

[0029] In the specific implementation process, the side wall of the sewage pipe 1 is provided with a wire hole; the air inlet pipe 5, the air outlet pipe 6 and the wire 9 are all passed through the wire hole; when using this device, the wire hole needs to be sealed to prevent sewage from seeping out from the wire hole.

[0030] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention device for a drain, comprising a drain (1), characterized in that: The straight insertion pipe (2) is provided with a flange at the top of the annular space formed between the straight insertion pipe (2) and the blow-off pipe (1), and a mounting hole is formed in the sidewall of the straight insertion pipe (2), wherein an air bag (3) is mounted on the upper part of the mounting hole, the top of the air bag (3) is fixedly connected with the upper part of the mounting hole, and a float switch (4) is arranged in the annular space formed between the straight insertion pipe (2) and the blow-off pipe (1); the upper part of the air bag (3) is communicated with an air inlet pipe (5) and an air outlet pipe (6), the other end of the air inlet pipe (5) is communicated with an air pump (13), and the air pump (13) and the other end of the air outlet pipe (6) are both located outside the blow-off pipe (1); an air inlet valve is mounted on the air inlet pipe (5), and an air outlet valve is mounted on the air outlet pipe (6); Further comprising an operation plate, wherein a controller (12), a green indicator light (10), a red indicator light (11) and a starting switch are mounted on the operation plate, the float switch (4), the air pump (13), the green indicator light (10), the red indicator light (11), the air inlet valve and the air outlet valve are electrically connected with the controller (12), and the starting switch is electrically connected with the controller (12); When the blow-off pipe (1) is in a normal drainage state, the green indicator light (10) on the operation plate is always on, indicating that the blow-off pipe (1) is working normally and no backwater occurs; When the blow-off pipe (1) is in a backwater state, the water level of sewage rises, and when the water level rises to the position of the float switch (4), the float switch (4) is triggered, a trigger signal is transmitted to the controller (12), the controller (12) controls the green indicator light (10) to be turned off and the red indicator light (11) to be always on, controls the air pump (13) and the air inlet valve to be turned on, and the air bag (3) starts to be inflated, and as the air bag (3) continues to be inflated, the volume of the air bag (3) continues to increase until the volume of the air bag (3) increases to the point that the surface of the air bag (3) is in contact with the inner sidewall of the straight insertion pipe (2), at which time the controller (12) controls the air pump (13) and the air inlet valve to be turned off, at this time, the rising path of the sewage is completely blocked, and the purpose of preventing backwater is achieved; If the sewage continues to fail to drop, the red indicator light (11) continues to be always on, continuously prompting the abnormal backwater state of the blow-off pipe (1) to the staff, and when the sewage starts to drop, the sewage is away from the float switch (4), the float switch (4) is closed, the controller (12) controls the red indicator light (11) to be turned off and the green indicator light (10) to be always on, controls the air outlet valve to be turned on, and the air bag (3) starts to be deflated, and as the air bag (3) continues to be deflated, the volume of the air bag (3) returns to the original state, which does not affect the transportation of the sewage, and the air outlet valve is turned off, thereby achieving the purpose of preventing backwater of the blow-off pipe (1); The top of the mounting hole is rotatably provided with an air bag protection cover (7) located in the interior of the straight insertion pipe (2), the surface of the air bag protection cover (7) is in contact with the surface of the air bag (3), and the air bag protection cover (7) is made of silicone rubber; The float switch (4) is connected with the controller (12) through the electric wire (9); the bottom end of the annular space formed between the straight insertion pipe (2) and the blow-off pipe (1) is provided with a filter screen (8) in the form of a ring, the inner ring of the filter screen (8) is fixedly connected with the outer side wall of the straight insertion pipe (2), and the outer ring of the filter screen (8) is fixedly connected with the inner side wall of the blow-off pipe (1).

2. The anti-backup device for a drain according to claim 1, wherein: An air pressure gauge is mounted on the air inlet pipe (5), and the air pressure gauge is electrically connected with the controller (12).

3. The anti-backup device for a drain according to claim 1, wherein: The inner ring of the flange is fixedly connected with the top end of the straight insertion pipe (2), and the outer ring of the flange is fixedly connected with the top end of the blow-off pipe (1).

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