Hidden low-resistance anti-backflow device

Abstract

The utility model belongs to the field of municipal engineering, and particularly relates to a concealed low-resistance anti-backflow device which is characterized in that a partition wall is arranged in a catch basin, an anti-backflow pipeline is arranged on the partition wall, the anti-backflow pipeline penetrates through the partition wall and extends towards a water outlet pipeline, and the height of the anti-backflow pipeline is lower than that of a water inlet pipeline and that of the water outlet pipeline; a flap valve device is installed at one end of the anti-backflow pipeline, a flap valve movable plate of the flap valve device is an inclined plate, and a balance weight structure is arranged on the lower portion of the flap valve movable plate. The anti-backflow device is arranged in the catch basin, the situation that a traditional anti-backflow device is arranged in a river channel to affect river channel drainage is avoided, the impact influence of river channel water flow on the anti-backflow device is reduced, and the starting resistance of the anti-backflow device is reduced by means of the submerged suspension characteristic.

Description

Technical Field

[0001] The utility model belongs to the field of municipal engineering, and in particular relates to a concealed low-resistance backflow prevention device. Background Art

[0002] Backflow prevention refers to taking measures to prevent high-water level rain in the river from flowing back into low-lying residential areas through pipes to ensure the normal operation and safety of the drainage system. The current anti-backflow devices mainly include anti-backflow flap gates and anti-backflow duckbill valves, which are installed at the river entrance. Traditional flap gates are mostly made of iron products, and opening the flap gates requires greater resistance. The opening resistance will be further increased under the flushing of river water, and the drainage will be hindered in the case of gravity flow drainage, affecting the drainage performance of the pipeline; duckbill valves are usually longer in size, and they usually need to be extended into the river when installed along the river, affecting the drainage of the river. In particular, large pipeline duckbill valves are not only water-blocking but also mostly made of rubber products. They are easily aged by wind and sun, and are easily damaged over time. In view of the above problems, it is considered to develop a concealed low-resistance anti-backflow device. Summary of the invention

[0003] The problem to be solved by the present invention is to overcome the shortcomings of the background technology and provide a concealed low-resistance backflow prevention device.

[0004] The present invention is achieved through the following technical solutions:

[0005] A concealed low-resistance backflow prevention device, a partition wall is provided in a rainwater well, an anti-backflow pipe is provided on the partition wall, the anti-backflow pipe passes through the partition wall and extends toward a water outlet pipe, the height of the anti-backflow pipe is lower than that of a water inlet pipe and a water outlet pipe, a flap device is installed at one end of the anti-backflow pipe toward the water outlet pipe, a flap plate of the flap device is an inclined plate, a counterweight structure is provided at the lower part of the flap plate, and the flap plate is in an open state when water flows from the water inlet pipe to the water outlet pipe.

[0006] Preferably, the flap door movable plate has a specific gravity of 1.05-1.1 times that of water.

[0007] Preferably, the flap door movable plate is a plastic plate

[0008] Preferably, the flap door movable plate has an inclination angle of 5°.

[0009] Preferably, the top of the partition wall is flush with the top of the inner wall of the rainwater well.

[0010] Preferably, the anti-backflow pipe is exposed outside the partition wall by 15-20 cm.

[0011] Preferably, the backflow prevention pipe is 30-50 cm lower than the water inlet pipe or the water outlet pipe.

[0012] Preferably, the counterweight structure is a plurality of counterweight bars or a plurality of counterweight blocks.

[0013] Preferably, a support frame is fixed to the upper end surface of the backflow prevention pipe, and the flap door movable plate is hinged on the support frame through a column pin.

[0014] Beneficial effects of the present invention:

[0015] 1. The backflow prevention device is installed in the rainwater well, which is relatively hidden, avoiding the impact of the traditional backflow prevention device placed in the river channel on the river drainage. In addition, it also reduces the impact of the river flow on the backflow prevention device, and improves the defect of the traditional backflow prevention device being exposed and unsightly;

[0016] 2. The submerged suspension characteristics are used to reduce the opening resistance of the anti-backflow device, avoiding the defect that the traditional anti-backflow device has large opening resistance due to its own weight, which affects the drainage performance of the outlet pipe;

[0017] 3. The height of the anti-backflow device is lower than the water inlet pipe and the water outlet pipe, ensuring that the anti-backflow device can be quickly submerged, minimizing the resistance to opening the flap door movable plate;

[0018] 4. The flap door movable plate is tilted to facilitate closing the anti-backflow device with minimum pressure in the backflow state;

[0019] 5. The partition wall is set on the top to avoid drainage cross-flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal top view structure of this embodiment;

[0021] Figure 2 This is a schematic cross-sectional view of the structure of this embodiment;

[0022] Figure 3 The schematic diagram of the partial structure of the counterweight structure of this embodiment is a counterweight bar;

[0023] Figure 4 It is a schematic diagram of the partial structure of the counterweight structure of this embodiment, which is a counterweight block.

[0024] In the figure, 1 is a rainwater well, 2 is a partition wall, 3 is a backflow prevention pipe, 4 is a water inlet pipe, 5 is a water outlet pipe, 6 is a flap door movable plate, 7 is a counterweight structure, 8 is a support frame, and 9 is a column pin. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0026] The concealed low-resistance backflow prevention device of this embodiment is arranged in the rainwater well 1, which is relatively concealed. The "relatively closed" front design of the backflow prevention device avoids the interference of the backflow prevention device on the flood discharge and drainage of the river channel, and also improves the overall appearance of the drainage outlet. Specifically, a partition wall 2 is provided in the rainwater well 1. In order to avoid drainage cross-flow, this embodiment preferably sets the partition wall 2 on the top, that is, the top of the partition wall 2 is flush with the top of the inner wall of the rainwater well 1, dividing the rainwater well 1 into two well chambers. An anti-backflow pipe 3 is provided on the partition wall 2, and the anti-backflow pipe 3 passes through the partition wall 2. One end of the anti-backflow pipe 3 facing the water inlet pipe 4 is flush with the side wall of the partition wall 2, and one end of the anti-backflow pipe 3 facing the water outlet pipe 5 extends out of the partition wall 2. Preferably, the length of the anti-backflow pipe 3 exposed outside the partition wall 2 is 15-20 cm. The height of the anti-backflow pipe 3 is lower than the water inlet pipe 4 and the water outlet pipe 5. The purpose of this design is to ensure that the flap door device can be quickly submerged and minimize the opening resistance of the flap door movable plate 6. In this embodiment, the height of the anti-backflow pipe 3 is preferably 30-50 cm lower than the water inlet pipe 4 or the water outlet pipe 5.

[0027] A flap door device is installed at one end of the anti-backflow pipe 3 facing the outlet pipe 5, and the flap door movable plate 6 of the flap door device is an inclined plate. In this embodiment, the flap door movable plate 6 has an inclination angle of 5°, that is, the angle between the flap door movable plate 6 and the vertical direction is 5°, slightly tilted toward the direction of the partition wall 2. The flap door movable plate 6 is designed to be inclined to ensure that the flap door movable plate 6 is closed with minimum pressure in the backflow state. The flap door device is an existing conventional device and will not be described in detail here. A support frame 8 is fixed on the upper end face of the anti-backflow pipe 3, and the flap door movable plate 6 is hinged to the support frame 8 by a column pin 9. The flap door movable plate 6 can be rotated around the column pin 9 to open or close. A counterweight structure 7 is provided at the lower part of the flap door movable plate 6. The form of the counterweight structure 7 is not limited. This embodiment provides two structural schematic diagrams of the counterweight structure 7 as a plurality of counterweight bars and a plurality of counterweight blocks, as shown in the attached figure. Figure 3 and 4 As shown. When water flows from the water inlet pipe 4 to the water outlet pipe 5, the flap door movable plate 6 is in an open state, that is, when the water flow is in a normal state, the flap door movable plate 6 is in an open state. Preferably, the flap door movable plate 6 is a plastic plate made of low-density plastic material. The purpose of setting the counterweight structure 7 is to make the overall specific gravity of the flap door movable plate 6 1.05-1.1 times that of water, so as to ensure that during normal operation (water flows from the water inlet pipe 4 to the water outlet pipe 5), the flap door movable plate 6 is in a nearly suspended state in the water.

[0028] Working process: as attached Figure 2As shown in the figure, the dotted line is the route of closing and opening of the flap door movable plate 6. When it rains, the water inlet pipe 4 and the water outlet pipe 5 are filled with rainwater, and the flap door device is submerged in the water body. Since the flap door movable plate 6 is slightly heavier than the water body, the flap door movable plate 6 is approximately in a suspended state. Under the impact of the water flow in the water inlet pipe 4, the flap door movable plate 6 is in a fully open suspended state, ensuring that the drainage performance of the water outlet pipe 5 is fully utilized; when high water level backflow occurs at the water outlet, the flap door movable plate 6 can quickly fall back and close the flap door device under the impact of the backflow water and its own weight, thereby preventing backflow.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A concealed low-resistance backflow prevention device, characterized in that: A partition wall (2) is provided in the rainwater well (1), and a backflow prevention pipe (3) is provided on the partition wall (2). The backflow prevention pipe (3) passes through the partition wall (2) and extends toward the outlet pipe (5). The height of the backflow prevention pipe (3) is lower than the water inlet pipe (4) and the water outlet pipe (5). A flapping door device is installed at one end of the backflow prevention pipe (3) facing the outlet pipe (5). The flapping door movable plate (6) of the flapping door device is an inclined plate. A counterweight structure (7) is provided at the lower part of the flapping door movable plate (6). When water flows from the water inlet pipe (4) to the water outlet pipe (5), the flapping door movable plate (6) is in an open state.

2. The concealed low-resistance backflow prevention device according to claim 1 is characterized in that: The flap door movable plate (6) has a specific gravity of 1.05-1.1 times that of water.

3. The concealed low-resistance backflow prevention device according to claim 1 is characterized in that: The flap door movable plate (6) is a plastic plate.

4. The concealed low-resistance backflow prevention device according to claim 1, characterized in that: The flap door movable plate (6) has an inclination angle of 5°.

5. The concealed low-resistance backflow prevention device according to claim 1 is characterized in that: The top of the partition wall (2) is flush with the top of the inner wall of the rainwater well (1).

6. The concealed low-resistance backflow prevention device according to claim 1, characterized in that: The anti-backflow pipe (3) is exposed outside the partition wall (2) by 15-20 cm.

7. The concealed low-resistance backflow prevention device according to claim 1, characterized in that: The backflow prevention pipe (3) is 30-50 cm lower than the water inlet pipe (4) or the water outlet pipe (5).

8. The concealed low-resistance backflow prevention device according to claim 1, characterized in that: The counterweight structure (7) is a plurality of counterweight bars or a plurality of counterweight blocks.

9. The concealed low-resistance backflow prevention device according to claim 1, characterized in that: A support frame (8) is fixed to the upper end surface of the backflow prevention pipe (3), and the flap door movable plate (6) is hinged on the support frame (8) via a column pin (9).

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