Structure for reducing air suction amount of drop flow vertical shaft

Abstract

The invention discloses a structure for reducing the air suction amount of a drop flow vertical shaft, and belongs to the technical field of drainage systems. The structure for reducing the air suction amount of the drop shaft comprises a drop shaft body which is used for being fixed in the drop shaft body, the drop shaft body comprises a water inlet pipe, a water outlet pipe and an air inlet in the top, the structure further comprises a curved-surface baffle which is detachably installed in the drop shaft body through a supporting rod, and the distance between the water inlet pipe and the top of the curved-surface baffle is h1, the distance between the bottom of the curved-surface baffle and the top of the water outlet pipe is h2, the curved-surface baffle divides the inner space of the falling shaft body into a water passing area and a non-water-passing area, and the water passing area, the non-water-passing area and the interval form an air internal circulation channel. The entrained air flows back to the upper portion of the vertical shaft through the non-water-passing area along the back face of the curved face baffle and is dragged by falling water flow again, internal circulating air flow is formed, and therefore the overall air suction amount of the vertical shaft is reduced.

Description

Technical Field

[0001] This invention relates to the field of drainage system technology, and more specifically to a structure for reducing the air intake of a drop shaft. Background Technology

[0002] With the acceleration of urbanization, the construction of drainage pipe networks has developed rapidly. Vertical shafts, as a key component of drainage pipe networks, are used to transport sewage or rainwater from higher to lower levels. Among them, drop-down shafts are widely used due to their simple structure and ease of construction. However, existing drop-down shafts have significant problems: during the descent of water, the surrounding air is dragged downwards, drawing in a large amount of air into the shaft. This air, once carried into downstream pipes, increases the pipe pressure, causing toxic and harmful gases generated in the pipes to be released into the atmosphere through inspection wells or shafts, leading to environmental pollution and health risks.

[0003] In existing technologies, most solutions to this problem employ vertical or horizontal baffles. However, these structures occupy significant internal space within the shaft, potentially affecting drainage capacity and hindering personnel access during maintenance. Therefore, a solution that minimizes space requirements, does not impede drainage, and facilitates maintenance is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems in the prior art and provide a structure for reducing the air intake of the cascade shaft, which alleviates the problem of gas pressure accumulation in the pipeline, reduces the risk of releasing toxic and harmful gases into the environment, and improves the environmental protection and safety of the drainage system.

[0005] This invention provides a structure for reducing the air intake of a drop shaft, which is fixed within the drop shaft body. The drop shaft body includes an inlet pipe, an outlet pipe, and an air inlet at the top, and also includes a curved baffle. The curved baffle is detachably installed within the drop shaft body via a support rod. The curved baffle is an arc structure with a central angle of 180°. The axis of the curved baffle coincides with the axis of the drop shaft body, and its concave surface faces the outlet of the inlet pipe. The distance between the inlet pipe and the top of the curved baffle is h1, and the distance between the bottom of the curved baffle and the top of the outlet pipe is h2. There are gaps between the curved baffle and the top and bottom of the drop shaft body. The curved baffle separates the internal space of the drop shaft body into a water-passing area and a non-water-passing area. The water-passing area, the non-water-passing area, and the gaps form an internal air circulation channel.

[0006] Preferably, the concave surface of the curved baffle is provided with at least one set of arc-shaped plates, each set comprising two symmetrically arranged arc-shaped plates.

[0007] Preferably, the relationship between the drop shaft body and the curved baffle is D2=3 / 5D1, where D1 is the diameter of the drop shaft body, D2 is the diameter of the curved baffle, h1=1 / 5D1~2 / 5D1, and h2=1 / 5D1~2 / 5D1.

[0008] Preferably, the radius b of the arc plate is 1 / 4 of D2, the central angle is 75°, and it is deflected downwards by 10° towards the concave surface of the curved baffle.

[0009] Preferably, the arc length between the symmetrical arc plates corresponds to a central angle θ = 30°.

[0010] Preferably, the arc-shaped plates are installed at intervals from the bottom of the curved baffle upwards, with an adjacent group spacing of 0.3m and the number of groups installed is 2 to 5; the surface of the arc-shaped plates is provided with ribs, and the height of the ribs is 1mm to 3mm.

[0011] Preferably, several support rods are arranged horizontally, with one end of each support rod detachably connected to the drop shaft body and the other end connected to the curved baffle via a snap fastener.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: The structure of this invention for reducing the air intake of a drop shaft effectively creates an internal air circulation system through the partitioning effect of the curved baffle. When the incoming water flows down from the inlet pipe, it draws in outside air. However, due to the pressure difference, the drawn-in air flows back along the back of the curved baffle to the upper part of the drop shaft body through the non-water-repellent zone, and is then dragged again by the falling water flow, forming an internal circulating airflow. This significantly reduces the demand for fresh air intake, thereby reducing the overall air intake of the drop shaft body. This internal circulation design not only alleviates the problem of air pressure accumulation in the pipeline but also reduces the risk of releasing toxic and harmful gases into the environment, improving the environmental friendliness and safety of the drainage system. Attached Figure Description

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

[0014] Figure 2 This is a schematic diagram of the overall planar structure of the present invention.

[0015] Figure 3 This is a schematic diagram of the combined structure of the curved baffle and the arc plate of the present invention.

[0016] Figure 4 This is a schematic diagram of the symmetrical arrangement of the arc-shaped plate according to the present invention.

[0017] Figure 5 This is a schematic diagram comparing the air intake volume between the cascade shaft with curved baffles and the original shaft according to the present invention.

[0018] Figure 6 This is a schematic diagram showing the included angle between the curved baffle and the arc plate of the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1. Drop shaft body; 2. Water inlet pipe; 3. Water outlet pipe; 4. Air inlet; 5. Curved baffle; 6. Water passage area; 7. Non-water passage area; 8. Arc-shaped plate; 9. Support rod. Detailed Implementation

[0020] The following is in conjunction with the appendix Figures 1-6 To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art.

[0021] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. The drawings in this invention are not strictly drawn to scale; the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0022] This invention provides a structure for reducing the air intake of a cascade shaft, such as... Figures 1-6 As shown, it is used to fix it inside the drop shaft body 1. The drop shaft body 1 includes a water inlet pipe 2, a water outlet pipe 3, and an air inlet 4 at the top. It also includes a curved baffle 5, which can be detachably installed inside the drop shaft body by a support rod 9. The curved baffle 5 is an arc structure with a central angle of 180°. The axis of the curved baffle 5 coincides with the axis of the drop shaft body 1, and the concave surface faces the outlet of the water inlet pipe 2. The distance between the water inlet pipe 2 and the top of the curved baffle 5 is h1, and the distance between the bottom of the curved baffle 5 and the top of the water outlet pipe 3 is h2. There are gaps between the curved baffle 5 and the top and bottom of the drop shaft body 1. The curved baffle 5 separates the water passage area 6 and the non-water passage area 7 in the internal space of the drop shaft body 1. The water passage area 6, the non-water passage area 7, and the gap form an internal air circulation channel.

[0023] In this embodiment, the curved baffle 5 effectively creates an internal air circulation system. When the incoming water flows down from the inlet pipe 2, it draws in outside air. However, due to the pressure difference, the drawn-in air flows back along the back of the curved baffle 5 to the upper part of the drop shaft body 1 through the non-water-repellent zone 7, and is then dragged again by the falling water flow, forming an internal circulating airflow. This significantly reduces the need for fresh air intake, thereby reducing the overall air intake of the drop shaft body 1. This internal circulation design not only alleviates the problem of air pressure buildup in the pipes but also reduces the risk of releasing toxic and harmful gases into the environment, improving the environmental friendliness and safety of the drainage system.

[0024] Preferred, such as Figures 1-4 As shown, the concave surface of the curved baffle 5 is provided with at least one set of arc plates 8, each set containing two symmetrically arranged arc plates 8.

[0025] In this embodiment, each group includes two symmetrically arranged arc-shaped plates 8, which significantly enhances the water flow guidance capability. After the incoming water flow impacts the curved baffle 5, part of the water flow is guided along the surface of the arc-shaped plate 8 to the wall of the drop shaft body 1 on one side of the water inlet pipe 2, forming a stable wall flow. This greatly reduces the water-air contact area and reduces the drag force of the water flow on the air, thereby further suppressing air entrainment;

[0026] The curved plate 8 disperses the water flow more evenly, reducing splashing and eddies and improving internal circulation efficiency. The symmetrical design ensures balanced water flow distribution, avoids localized pressure concentration, and enhances structural durability. Furthermore, as an add-on component, the curved plate 8 can be easily integrated into the concave surface of the curved baffle 5 without affecting overall disassembly, allowing for easy adjustment of the installation quantity according to flow requirements.

[0027] Preferred, such as Figures 1-4 As shown, the relationship between the drop shaft body 1 and the curved baffle 5 is D2=3 / 5D1, where D1 is the diameter of the drop shaft body 1, D2 is the diameter of the curved baffle 5, h1=1 / 5D1~2 / 5D1, h2=1 / 5D1~2 / 5D1.

[0028] In this embodiment, the water flow coverage and airflow channel are optimized to ensure efficient suction reduction. The diameter D2=3 / 5D1 of the curved baffle 5 precisely matches the water flow impact range, which not only fully disperses the water flow impact but also avoids material waste. h1=1 / 5D1~2 / 5D1 controls the water inlet drop height, reduces the free fall distance, and thus reduces the initial suction intensity; h2=1 / 5D1~2 / 5D1 ensures sufficient bottom spacing to prevent the water cushion layer from blocking the air return channel and maintain smooth internal circulation.

[0029] Preferred, such as Figures 2-6 As shown, the radius b of the arc plate 8 is 1 / 4 of D2, the central angle is 75°, and it is deflected downwards by 10° towards the concave surface of the curved baffle 5.

[0030] In this embodiment, the width b = D² / 4 ensures that the curved baffle 5 can catch most of the dispersed water flow, guiding it to the wall of the drop shaft body 1 to form a wall-mounted flow, reducing the water-air contact area by more than 30%. A central angle of 75° optimizes the curvature of the arc-shaped plate 8, matching the natural dispersion angle of the water flow after impact, improving guiding efficiency. A downward deflection of 10° enhances the downward trend of the water flow, preventing water rebound or stagnation, ensuring a smooth flow into the flow channel on the wall of the drop shaft body 1.

[0031] Preferred, such as Figures 2-4 As shown, the arc length between the symmetrical arc plates 8 corresponds to a central angle θ = 30°.

[0032] In this embodiment, the θ=30° interval arc length allows some water to fall directly through the gap, reducing the amount of water flowing to the arc plate 8 and preventing overload of the arc plate 8. This acts as a natural diversion, reducing the pressure on the arc plate 8 by 40% and extending the component's lifespan. At the same time, the interval ensures that air can partially infiltrate into the water passage zone 6, assisting in stabilizing the internal circulation airflow.

[0033] Preferred, such as Figures 2-4 As shown, the arc-shaped plates 8 are installed at intervals from the bottom of the curved baffle 5 upwards, with an adjacent group spacing of 0.3m and a number of 2 to 5 groups installed; the surface of the arc-shaped plates 8 is provided with ribs, the height of which is 1mm to 3mm.

[0034] In this embodiment, the 0.3m spacing between adjacent groups provides a flexible layout. The groups are installed at intervals starting from the bottom of the curved baffle 5 and moving upwards, covering water flow impact points at different heights and improving water capture rate. The number of groups (2-5) can be adjusted based on the actual flow rate; fewer groups are used at low flow rates to save space, while more groups are used at high flow rates to enhance the effect. The 1mm-3mm height of the surface ribs increases friction, slows the water flow velocity, reduces turbulence and entrainment intensity, and enhances the overall system adaptability and durability.

[0035] Preferred, such as Figures 1-4 As shown, the water passage 7 is connected to the air inlet 4 and is used to guide the entrained air back along the back of the curved baffle 5 to the upper part of the shaft; the water passage 6 is aligned with the outlet of the water inlet pipe 2. When the water flows down, it hits the curved baffle 5 and part of it falls through the gap of the arc plate 8, while part of it deflects along the arc plate 8 to form a wall-attached flow.

[0036] In this embodiment, the non-water-passing zone 7 is connected to the air inlet 4 and is specifically used to guide the entrained air back along the back of the curved baffle 5 to the upper part of the shaft, forming an efficient internal circulation channel. The water-passing zone 6 is aligned with the outlet of the water inlet pipe 2. After the water flow hits the curved baffle 5, part of it falls through the gap of the arc plate 8, and part of it deflects along the arc plate 8 to form a wall-adhering flow, reducing the water-air interaction area.

[0037] Preferred, such as Figures 1-2As shown, several support rods 9 are horizontally arranged. One end of each support rod 9 is detachably connected to the drop shaft body 1, and the other end is connected to the curved baffle 5 by a snap fastener.

[0038] In this embodiment, one end of the horizontal support rod 9 is detachably connected to the shaft body, and the other end is connected to a baffle via a snap-fit, enabling quick assembly and disassembly. During maintenance, the support rod 9 is removed, the baffle is taken out, and personnel can then enter the drop shaft body 1, reducing downtime. The snap-fit ​​design ensures stable installation, resists water flow impact, and improves system safety.

[0039] The method of using the structure of the present invention for reducing the air intake of a drop shaft is as follows: The curved baffle 5 is detachably installed into the drop shaft body 1 via the support rod 9, ensuring that the axis of the curved baffle 5 coincides with the shaft and the concave surface faces the outlet of the inlet pipe 2. Adjust the support rod 9 to be horizontally fixed, and set h1 and h2 within the range of 1 / 5D1 to 2 / 5D1. Install 5 sets of arc plates according to the design flow rate, each set is symmetrically fixed to the concave surface of the curved baffle 5, with a spacing of 0.3m, and ensure that the width of the arc plate 8 is b=D2 / 4, the central angle is 75°, the downward deflection is 10°, and the surface is reinforced with 1mm to 3mm ridge strips;

[0040] Water flows into the drop shaft from the inlet pipe 2. After impacting the curved baffle 5, some water falls through the gap in the arc plate 8, while some is guided along the arc plate 8 to form a wall-attached flow on one side of the inlet pipe 2. Air is drawn in and flows back along the back of the curved baffle 5 through the non-water-repellent zone 7, forming an internal circulating airflow and reducing the intake of external air.

[0041] During maintenance, the support rod 9 clips are removed, and the curved baffle 5 and arc plate 8 are taken out, allowing personnel to enter the shaft for inspection. After completion, the curved baffle 5 is reinstalled, and parameters are adjusted to adapt to the new flow conditions. The entire process is efficient and convenient, significantly improving the shaft's lifespan and environmental performance.

[0042] 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 structure for reducing the air intake of a drop shaft, for fixing within the drop shaft body (1), the drop shaft body (1) comprising an inlet pipe (2), an outlet pipe (3), and an air inlet (4) at the top, characterized in that, It also includes a curved baffle (5), which is detachably installed inside the drop shaft body (1) via a support rod (9). The curved baffle (5) is an arc structure with a central angle of 180°. The axis of the curved baffle (5) coincides with the axis of the drop shaft body (1), and the concave surface faces the outlet of the water inlet pipe (2). The distance between the water inlet pipe (2) and the top of the curved baffle (5) is h1, and the distance between the bottom of the curved baffle (5) and the top of the water outlet pipe (3) is h2. There are gaps between the curved baffle (5) and the top and bottom of the drop shaft body (1). The curved baffle (5) divides the internal space of the drop shaft body (1) into a water passage area (6) and a non-water passage area (7). The water passage area (6), the non-water passage area (7), and the gap form an internal air circulation channel.

2. The structure for reducing the air intake of a drop shaft as described in claim 1, characterized in that, The concave surface of the curved baffle (5) is provided with at least one set of arc plates (8), each set containing two symmetrically arranged arc plates (8).

3. The structure for reducing the air intake of a drop shaft as described in claim 2, characterized in that, The relationship between the drop shaft body (1) and the curved baffle (5) is D2=3 / 5D1, where D1 is the diameter of the drop shaft body (1), D2 is the diameter of the curved baffle (5), h1=1 / 5D1~2 / 5D1, h2=1 / 5D1~2 / 5D1.

4. The structure for reducing the air intake of a drop shaft as described in claim 3, characterized in that, The radius b of the arc plate (8) is 1 / 4 of D2, the central angle is 75°, and it is deflected downwards by 10° toward the concave surface of the curved baffle (5).

5. The structure for reducing the air intake of a drop shaft as described in claim 2, characterized in that, The arc length between the symmetrical arc plates (8) corresponds to the central angle θ = 30°.

6. The structure for reducing the air intake of a drop shaft as described in claim 2, characterized in that, The arc-shaped plate (8) is installed at intervals from the bottom of the curved baffle (5) upwards, with an adjacent group spacing of 0.3m and a number of 2 to 5 groups installed; the surface of the arc-shaped plate (8) is provided with ribs, and the height of the ribs is 1mm to 3mm.

7. The structure for reducing the air intake of a drop shaft as described in claim 1, characterized in that, Several support rods (9) are horizontally arranged. One end of each support rod (9) is detachably connected to the drop shaft body (1), and the other end is connected to the curved baffle (5) by a snap fastener.

Images