An automatic odor-proof and backflow-proof manhole cover

Abstract

This invention relates to an automatic odor-proof and backflow-proof manhole cover, effectively solving the problems of manhole cover displacement due to excessive pressure inside the manhole and preventing odor. The technical solution includes a telescopic cylinder composed of multiple nested cylindrical sections, with limiting blocks between adjacent sections. The innermost cylinder is the inner cylinder, with a cover fixed to its upper end. A box is fixed to the lower end of the cover, with multiple drainage holes corresponding to the box on the cover. An inner tube is fixed to the center of the bottom of the box, its lower end penetrating the box. An outer tube, fitted around the inner tube, is located at the lower end of the cover, with gaps between the outer tube and the box, and between the inner tube and the cover. A float that can move up and down is installed inside the inner cylinder; when the float rises, it blocks the lower end of the inner tube. The upper sidewall of the inner cylinder is a perforated overflow outlet. An annular float is installed inside the inner cylinder, with multiple compression springs connecting its upper end to the cover. This invention prevents sewage and sludge leakage and splashing.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering technology, and in particular to an automatic odor-proof and backflow-proof manhole cover. Background Technology

[0002] Due to the varying elevations of cities, there are height differences between manhole covers. Therefore, during heavy rain, drainage pipes cannot drain water in time. Once the pipes are full of water, the lower-lying manhole covers are easily pushed upwards, causing backflow. This leads to manhole covers being washed away, sewage and sludge leaking out, and foul odors. Several methods to prevent backflow exist in the market and in patent literature, which can be broadly divided into two types. The first is to forcibly seal the manhole cover, such as the anti-backflow drift manhole cover disclosed in patent literature CN103924620A, which uses a special fastening mechanism to ensure the cover is not washed away. However, this method has safety hazards and can easily cause the cover to suddenly burst open or be violently damaged. The second is active pressure relief, which involves opening the manhole cover, such as the manhole cover disclosed in patent literature CN211312613U, which releases pressure by tilting one end up. While this can release pressure promptly, it does not consider the issue of sewage and sludge inside the manhole. This can easily lead to the uncontrolled leakage of sludge and debris from the pipes, seriously affecting the environment and causing silt accumulation on the road surface. Furthermore, since the manhole cover is submerged underwater, it cannot effectively warn pedestrians or prevent people or objects from falling into it. Also, a properly functioning manhole cover needs to be able to drain water and prevent odors promptly, and cannot simply be designed to prevent backflow. Summary of the Invention

[0003] In view of the above situation and to solve the problems existing in the prior art, the purpose of this invention is to provide an odor-proof and backflow-proof manhole cover, which can effectively solve the problems of manhole cover displacement caused by excessive pressure inside the well and odor prevention.

[0004] The technical solution includes a telescopic cylinder, which is composed of multiple nested cylindrical sections, with a limiting block between adjacent cylindrical sections; the innermost cylindrical section is the inner cylinder.

[0005] The inner cylinder is fixed with a cover at its upper end, and a box is fixed with the lower end of the cover. The cover has multiple drainage holes corresponding to the box. An inner tube is fixed at the center of the bottom of the box, and the lower end of the inner tube passes through the box. An outer tube is provided at the lower end of the cover and is sleeved on the outside of the inner tube. There are gaps between the outer tube and the box, and between the inner tube and the cover. A float that can move up and down is provided inside the inner cylinder. When the float rises, it can block the lower end of the inner tube.

[0006] The upper side wall of the inner cylinder is a hollow overflow port; an annular float is provided inside the inner cylinder, and multiple compression springs are connected between the upper end of the float and the cover; the float can open the overflow port when it rises and close the overflow port when it falls.

[0007] Between two adjacent cylinders, the outer cylinder has a limiting block on its upper inner wall, and the inner cylinder has a limiting block on its lower outer wall.

[0008] Multiple guide rods are fixed on the inner wall of the inner cylinder, and a protrusion is provided on the float, which can slide freely up and down along the guide rods.

[0009] The lower end of the inner tube is flush with the lower end face of the box body.

[0010] When the pontoon is not completely submerged, the buoyancy of the pontoon is greater than the weight of the entire device.

[0011] Advantages of this invention:

[0012] 1. Prevent sewage and sludge from leaking out and splashing.

[0013] 2. The manhole cover should be higher than the water level to alert pedestrians and vehicles and prevent accidents; it should also provide some support.

[0014] 3. Adapts to changes in water level, using the water height to balance internal water pressure and leverage force to release pressure.

[0015] 4. Automatic pressure relief after overpressure to prevent excessive pressure.

[0016] 5. Automatic reset.

[0017] 6. It can accelerate drainage and prevent odors in daily life. Attached Figure Description

[0018] Figure 1 This is a front cross-sectional view of the present invention (during a rainstorm).

[0019] Figure 2 This is a front cross-sectional view of the present invention (in everyday use).

[0020] Figure 3 This is a partial cross-sectional view of the inner cylinder of the present invention.

[0021] Figure 4 This is a front view of the inner cylinder of the present invention. Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Depend on Figures 1 to 4 The present invention includes a telescopic cylinder 1, which is composed of multiple nested cylindrical sections, with a limiting block 12 provided between adjacent cylindrical sections; wherein the innermost cylindrical section is the inner cylinder 2.

[0024] The inner cylinder 2 is fixed with a cover 3 at its upper end, and a box 4 is fixed with the lower end of the cover 3. The cover 3 has multiple drainage holes 5 corresponding to the box 4. An inner tube 6 is fixed at the center of the bottom of the box 4. The lower end of the inner tube 6 passes through the box 4. An outer tube 7 is provided at the lower end of the cover 3 and is sleeved on the outside of the inner tube 6. There are gaps between the outer tube 7 and the box 4, and between the inner tube 6 and the cover 3. A float 8 that can move up and down is provided inside the inner cylinder 2. When the float 8 rises, it can block the lower end of the inner tube 6.

[0025] The upper side wall of the inner cylinder 2 is a hollow overflow port 9; the inner cylinder 2 is provided with an annular float 10, and multiple compression springs 11 are connected between the upper end of the float 10 and the cover 3; the float 10 can open the overflow port 9 when it rises, and close the overflow port 9 when it falls.

[0026] In order to achieve the restriction and mutual support of the telescopic cylinder 1, between two adjacent cylinder sections, the outer cylinder is provided with a limiting block 12 on the inner wall of its upper end, and the inner cylinder is provided with a limiting block 12 on the outer wall of its lower end.

[0027] In order to install the float 8, multiple guide rods are fixed on the inner wall of the inner cylinder 2, and the float 8 is provided with protrusions that can slide freely up and down along the guide rods.

[0028] To make the support of the float 8 more stable, the lower end of the inner tube 6 is flush with the lower end face of the box body 4.

[0029] In order to achieve the effect of the telescopic cylinder 1 rising first and then depressurizing, when the float 8 is not completely submerged, the buoyancy of the float 8 is greater than the weight of the entire device.

[0030] In order to ensure that the cover 3 can be fully supported and to meet the requirements of the road surface, the diameter of the cover 3 is the same as the maximum diameter of the telescopic cylinder 1.

[0031] For ease of installation and disassembly, the cover 3 and the inner cylinder 2 are connected by bolts.

[0032] This device is suitable for various manholes, such as sewage manholes, rainwater manholes, wastewater manholes, power manholes, and other types of manhole covers. It is especially suitable for municipal sewage manholes, where backflow during rain has become a persistent problem in many old urban areas, causing serious environmental pollution and safety hazards. In use, first install this device inside the sewage manhole. During installation, fix the outermost cylindrical part of the telescopic cylinder 1 inside the manhole, securing it by drilling holes or welding a bracket to the bottom, etc.

[0033] See attached image for the manhole cover after it has been secured. Figure 2 As shown in the diagram, the multi-section cylinder of the telescopic cylinder 1 is in a retracted state, and the manhole cover is flush with the road surface.

[0034] Routine Drainage: When the road surface needs drainage, water flows into the tank 4 through the drain hole 5 on the cover 3. Due to the design of the outer pipe 7 and inner pipe 6, a U-shaped siphon and odor-proof bend is formed. When the water level in the tank 4 is higher than the upper end of the inner pipe 6, and the water inflow is increasing, the siphon effect is triggered, achieving rapid drainage and self-cleaning of the tank 4. Under normal circumstances, drainage is slow, and due to the bend design, the water inside the tank 4 will not be completely drained, achieving a water seal and preventing odors from leaking out of the well. During routine drainage, the float 8 is at the lowest point of its travel, at which point it will not block the lower end of the inner pipe 6, ensuring smooth drainage.

[0035] To prevent backflow during rainy weather, when the rainy season arrives, factors such as blockages in the main sewage pipes and water level differences within the city can cause some sewage in the sewage wells to backflow. At this time, the rising water level in the well will first push the float 8 upwards. Once the float 8 reaches its uppermost position, its upper end will block the lower end of the inner pipe 6, preventing sewage from flowing back out of the well through the inner pipe 6. Simultaneously, because the float 8 has a large cross-section and sufficient buoyancy, even before the water submerges it, the buoyancy of the float 8 will push against the housing 4, causing the entire inner cylinder 2 to rise, thus extending the telescopic cylinder 1 to accommodate the high pressure inside the well. (See appendix) Figure 1 As shown in the diagram, the water level inside the well is higher than that inside the well cover due to the high pressure. The expansion joint 1 prevents water from flowing out of the well, and the pressure is released by raising the water level inside the well.

[0036] When the telescopic cylinder 1 extends, the cover 3 will rise and be higher than the water level on the outside road surface, thus alerting pedestrians and preventing them from being in danger.

[0037] By using multiple cylindrical sections, the water level inside the well is raised, thereby overcoming the high pressure inside the sewage pipe. This allows the sewage to overcome its own pressure, avoiding the dangers caused by forcibly sealing the well cover.

[0038] When the pressure inside the well becomes too high and reaches the upper limit of the length of the telescopic cylinder 1, a pressure relief operation is required to prevent damage to the cover 3. That is, the water level inside the well continues to rise, completely grinding the float 8. Then, the water level continues to rise, which will push the float ring 10 to continue to rise. After the float ring 10 rises, it no longer blocks the overflow outlet 9, so the sewage can flow out from the overflow outlet 9, achieving rapid pressure relief.

[0039] When the pressure in the pipeline drops, the water level will drop. Due to the design of the float 8, the device can adaptively change its height according to different pressures until the pressure is completely eliminated. At this time, the entire device will automatically reset under its own weight without human intervention.

[0040] This device, through the design of the telescopic cylinder 1, utilizes the float 8 to cooperate with changes in water level, thereby achieving the effect of resisting the pressure inside the pipeline by raising the water level in the well, avoiding equipment damage caused by forcibly closing the wellhead. At the same time, the telescopic cylinder 1 provides sufficient strength and saves installation space. Most importantly, the number of sections of the telescopic cylinder 1 can be appropriately increased or decreased according to specific circumstances to adapt to different situations, thereby completely avoiding backflow.

[0041] This device is adaptive; the higher the pressure inside the pipeline, the higher the water level, and when the pressure inside the pipeline decreases, it can automatically reset itself without manual operation, reducing workload. Additionally, when the entire device extends, it serves as a warning system.

[0042] This device combines odor prevention and backflow prevention. Through this dual combination, it can prevent odors in daily life, and at the same time, it can use the siphon effect to self-clean the channel. In addition, it can prevent backflow during heavy rain, so that internal sewage cannot be leaked out.

Claims

1. An automatic anti-odor anti-backflow well cover, characterized in that, Including telescopic cylinder (1), telescopic cylinder (1) is nested by multiple cylinders, the limit block (12) is arranged between two adjacent cylinders;Among the most inside cylinder is the inner cylinder (2); The upper end of the inner cylinder (2) is fixed with the cover body (3), the lower end surface of the cover body (3) is fixed with the box body (4), a plurality of downcomer holes (5) corresponding to the box body (4) are formed in the cover body (3), the bottom center of the box body (4) is fixed with the inner tube (6), the lower end of the inner tube (6) penetrates the box body (4), the lower end of the cover body (3) is provided with the outer tube (7) sleeved outside the inner tube (6), and the outer tube (7) and the box body (4) and the inner tube (6) and the cover body (3) are all left with spacing;The inside of the inner cylinder (2) is provided with a float (8) that can move up and down, the float (8) can block the lower end of the inner tube (6) after rising; The upper end side wall of the inner cylinder (2) is the overflow port (9) of hollow shape;The inside of the inner cylinder (2) is provided with annular float ring (10), a plurality of compression springs (11) are connected between the upper end of the float ring (10) and the cover body (3);The float ring (10) can open the overflow port (9) after rising, and the float ring (10) can close the overflow port (9) after descending; When the float (8) is not completely submerged, the buoyancy of the float (8) is greater than the gravity of the whole device.

2. The automatic anti-odor and anti-backflow well cover according to claim 1, characterized in that, Between two adjacent cylinders, the inner wall of the upper end of the cylinder on the outside is provided with a limit block (12), and the outer wall of the lower end of the cylinder on the inside is provided with a limit block (12).

3. The automatic anti-odor and anti-backflow well cover according to claim 1, characterized in that, The inner wall of the inner cylinder (2) is fixed with a plurality of guide rods, the float (8) is provided with a protruding block, and the protruding block can slide up and down freely along the guide rod.

4. The automatic anti-odor and anti-backflow well cover according to claim 1, characterized in that, The lower end of the inner tube (6) is flush with the lower end surface of the box body (4).

5. The automatic anti-odor and anti-backflow well cover according to claim 1, characterized in that, The diameter of the cover body (3) is consistent with the maximum diameter of the telescopic cylinder (1).

6. The automatic anti-odor anti-backflow well cover according to claim 1, characterized in that, The cover body (3) and the inner cylinder (2) are connected by bolts.

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