Rear-embedded ventilation structure for aeration behind gate
By introducing a threshold and lowering the bottom plate to form a cantilever in the gate design, and connecting the air-entraining groove with the air-entraining pipe on the side wall, the problem of insufficient air entrainment at the gate's ventilation holes at high water levels is solved. This achieves effective protection of the gate and concrete structure, prevents cavitation damage, and improves operational stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河南省水利勘测设计研究有限公司
- Filing Date
- 2025-02-20
- Publication Date
- 2026-04-14
AI Technical Summary
When the water level in the discharge channel is high, the existing vent holes of the gate cannot effectively and timely aerate and replenish the bottom and sides of the water flow, which makes the bottom plate and the bottom of the side wall vulnerable to cavitation, causing cavitation damage to the hydraulic structure.
The design incorporates a rear-embedded ventilation structure for aeration after the gate, which includes lowering the bottom plate behind the gate to form a raised sill. The aeration tank is connected to the aeration pipe on the side wall to ensure that the water flow can continuously carry air. Combined with the ventilation pipe, it enables the gate to exhaust air when it is opened and replenish air when it is closed, thereby balancing the air pressure and reducing cavitation and vibration.
It effectively prevents cavitation damage to gates and concrete structures, ensuring project safety. By creating a flow-carrying and aeration space, it ensures uniform aeration of water flow, reduces cavitation and vibration, and improves the operational stability of the gate.
Smart Images
Figure CN224119516U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water conservancy engineering technology, and in particular to a rear-embedded ventilation structure for post-gate aeration. Background Technology
[0002] In hydraulic engineering, gates are crucial control components, and their design typically requires the inclusion of vents. Vents serve several purposes: inflating and deflating the gate, balancing air pressure before and after the gate, improving flow patterns, reducing cavitation and vibration, and protecting the gate structure and concrete structure from damage. In existing projects, venting steel pipes embedded in the rear wall of the gate chamber are often used as vents (see...). Figure 1 The vent is positioned above the highest water level in the discharge channel, and its outlet extends upwards to above the free water surface at the top of the gate. Normally, the vent effectively releases air when the gate is open and replenishes air to the water downstream when the gate is closed. However, when the discharge water level is high, the vent's inlet is positioned too high, making it difficult for natural aeration of the water surface to extend across the entire cross-section. In this case, it is impossible to effectively aerate and replenish air to the bottom and sides of the water flow, making the bottom plate and sidewalls vulnerable to cavitation, thus leading to cavitation damage to the hydraulic structure. Summary of the Invention
[0003] To solve the above problems, this utility model provides a rear-embedded ventilation structure for post-gate gas mixing, specifically adopting the following technical solution:
[0004] The rear-embedded ventilation structure for post-gate aeration according to this utility model includes a gate chamber. The bottom plate of the gate chamber is divided into a front bottom plate and a rear bottom plate. The front bottom plate is horizontally arranged, and the rear bottom plate is lower than the front bottom plate. An aeration groove is provided on the rear bottom plate. Aeration pipes are provided in both the left and right side walls of the gate chamber. The aeration pipes are vertically arranged, with the bottom end of the aeration pipe extending into the aeration groove and the top end of the aeration pipe extending into the gate chamber and above the highest discharge water level. A ventilation pipe is provided in the rear wall of the gate chamber. The bottom end of the ventilation pipe is above the highest discharge water level, and the top end of the ventilation pipe extends upward to above the free water surface at the top of the gate.
[0005] The height difference between the front and rear base plates of the threshold is 0.6m.
[0006] The gas mixing tank is located adjacent to the front bottom plate of the threshold. Its cross-section is a right trapezoidal structure, and the angle between the downstream slope and the bottom of the tank is 135°.
[0007] The bottom surface of the gate chamber is formed by a first horizontal surface, a first slope, a second horizontal surface, a second slope, and a third horizontal surface arranged along the water flow direction. The second horizontal surface and the second slope are positioned and shaped to correspond to the aeration tank above them, and the length of the second horizontal surface is greater than the bottom length of the aeration tank.
[0008] The angle between the first slope, the second slope and the second horizontal plane is 135°, and toothed walls with a slope ratio of 1:1 are provided at both ends of the first slope and the second slope.
[0009] Both the gas-infusing pipe and the venting pipe are pre-embedded steel pipes, and the gas-infusing pipes are symmetrically arranged inside the left and right side walls of the gate chamber.
[0010] The gas mixing pipe has a U-shaped structure, with its middle section vertically embedded in the side wall of the gate chamber, and its bottom and top ports perpendicular to the middle section.
[0011] The rear-embedded ventilation structure for post-gate aeration provided by this utility model is simple in structure, convenient in construction, low in cost, and has good operating effect. It adopts the method of lowering the bottom plate after the threshold to form a sill, thereby creating a flow when the gate is opened. When the rapid flow passes through, it works with the aeration tank after the threshold to create a flow separation and a low-pressure chamber, forming an aeration space. The aeration pipe set in the side wall ensures that the aeration tank is connected to the atmosphere above the water surface, thereby ensuring that the water flow can continuously carry and incorporate air, that is, to provide aeration protection for the bottom plate of the gate chamber and the lower part of the side wall, thereby playing a role in reducing and resisting corrosion of the concrete sidewall and ensuring the safety of the project. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the ventilation structure of the existing gate chamber.
[0013] Figure 2 This is a schematic diagram of the structure of this utility model.
[0014] Figure 3 yes Figure 2 Enlarged view of the bottom plate of the central gate chamber.
[0015] Figure 4 yes Figure 3 AA section view.
[0016] Figure 5 yes Figure 3 BB view in the middle. Detailed Implementation
[0017] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific working processes. However, the protection scope of this utility model is not limited to the following embodiments.
[0018] like Figure 2-5As shown, the rear-embedded ventilation structure for post-gate aeration according to this utility model includes a gate chamber with an arc-shaped gate 1 inside. The bottom plate of the gate chamber is divided into a front sill plate 2 and a rear sill plate 3. The front sill plate 2 is horizontally positioned, and the rear sill plate 3 is lower than the front sill plate 2. An aeration groove 4 is provided on the rear sill plate 3. Normally, the aeration groove 4 is adjacent to the front sill plate 2, and its cross-section is a right-angled trapezoidal structure. In this embodiment, the height difference between the front sill plate 2 and the rear sill plate 3 is 0.6m. The groove depth of the aeration groove 4 is 0.35m, the bottom length of the lower part is 0.5m, and the bottom length of the upper part is 0.85m. The angle between the downstream slope and the bottom surface of the groove is 135°. The bottom surface of the gate chamber floor is formed by a series of interconnected horizontal surfaces 51, 52, 53, 54, and 55 arranged along the water flow direction. The second horizontal surface 53 and 54 correspond to and are contoured to the aeration tank 4 above them. Compared to the aeration tank 4, the second horizontal surface 53 extends upstream, with a total length of 1.3m, meaning its length is greater than the bottom length of the aeration tank 4. The angle between the first slope 52, the second slope 54, and the second horizontal surface 53 is 135°. Both ends of the first slope 52 and the second slope 54 are constructed with toothed walls with a slope ratio of 1:1.
[0019] An aeration pipe 7 is installed in both the left and right side walls 6 of the gate chamber. The diameter of the aeration pipe 7 is determined according to the discharge flow rate and allowable wind speed. In this embodiment, the aeration pipe 7 has a U-shaped structure and is made of 600 galvanized steel pipe with a wall thickness of 10mm. Its middle section 71 is vertically embedded in the side wall 6 of the gate chamber, and its bottom port 72 and top port 73 are horizontally arranged, both perpendicular to the middle section 71. Furthermore, the bottom port 72 of the aeration pipe 7 extends into the aeration channel 7, and the top port 73 extends into the gate chamber and is higher than the highest discharge water level. Normally, the aeration pipes 7 in the left and right side walls 6 are symmetrically arranged, and steel wire mesh is installed at the bottom port 72 and top port 73 for protection.
[0020] A galvanized steel pipe is embedded in the rear wall 8 of the gate chamber as a vent pipe 9. The bottom port 91 of the vent pipe 9 is set above the highest discharge water level, and the top port 92 extends upward to above the free water surface at the top of the gate.
[0021] The design of the rear sill plate 3 being lower than the front sill plate 2 creates a sill at the sill position, forming a sill that allows for a sloping flow when the gate is opened. When the rapid flow passes through, it works in conjunction with the aeration tank 4 to create a flow separation and a low-pressure chamber, forming an aeration space. The aeration pipe 7 embedded in the side wall 6 does not affect the stability of the water flow. Since the aeration pipe 7 in both side walls 6 is connected to the aeration tank 4, it is open to the atmosphere above the water surface, ensuring that the water flow can continuously carry and incorporate air. Depending on the operating conditions, aeration is applied to the lower part of the water flow, providing aeration protection for the gate chamber floor and the lower part of the side walls, and effectively reducing and resisting corrosion of the concrete sidewalls. Simultaneously, the vent pipe 9 in the rear wall 8 effectively vents air when the gate is opened and replenishes air to the water behind the gate when the gate is closed, balancing the air pressure before and after the gate, improving the flow pattern, reducing cavitation and vibration, and protecting the gate structure and concrete structure from damage.
[0022] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
Claims
1. A post-embedded ventilation structure with post-gate gas mixing, characterized in that: The system includes a gate chamber, the bottom of which is divided into a front sill plate and a rear sill plate. The front sill plate is horizontally positioned, and the rear sill plate is lower than the front sill plate. An air-infusing trough is provided on the rear sill plate. An air-infusing pipe is installed inside the side wall of the gate chamber. The air-infusing pipe is vertically positioned, with its bottom end extending into the air-infusing trough and its top end extending into the gate chamber and above the highest discharge water level. A venting pipe is installed inside the rear wall of the gate chamber. The bottom end of the venting pipe is above the highest discharge water level, and its top end extends upward to above the free water surface at the top of the gate.
2. The post-embedded ventilation structure with post-gate gas mixing according to claim 1, characterized in that: The height difference between the front and rear base plates of the threshold is 0.6m.
3. The post-embedded ventilation structure with post-gate gas mixing according to claim 1, characterized in that: The gas mixing tank is located adjacent to the front bottom plate of the threshold. Its cross-section is a right trapezoidal structure, and the angle between the downstream slope and the bottom of the tank is 135°.
4. The post-embedded ventilation structure with post-gate gas mixing according to claim 1, characterized in that: The bottom surface of the gate chamber is formed by a first horizontal surface, a first slope, a second horizontal surface, a second slope, and a third horizontal surface arranged along the water flow direction. The second horizontal surface and the second slope are positioned and shaped to correspond to the aeration tank above them, and the length of the second horizontal surface is greater than the bottom length of the aeration tank.
5. The post-embedded ventilation structure for post-gate gas mixing according to claim 4, characterized in that: The angle between the first slope, the second slope and the second horizontal plane is 135°, and toothed walls with a slope ratio of 1:1 are provided at both ends of the first slope and the second slope.
6. The post-embedded ventilation structure with post-gate gas mixing according to claim 1, characterized in that: Both the gas-infusing pipe and the venting pipe are pre-embedded steel pipes, and the gas-infusing pipes are symmetrically arranged inside the left and right side walls of the gate chamber.
7. The post-embedded ventilation structure with post-gate gas mixing according to claim 1, characterized in that: The gas mixing pipe has a U-shaped structure, with its middle section vertically embedded in the side wall of the gate chamber, and its bottom and top ports perpendicular to the middle section.