Ventilation device for flap valve of pump drainage system

Abstract

The utility model provides a ventilation device for a flap valve of a pump drainage system, and belongs to the technical field of water conservancy and hydropower engineering. The straight pipe type water outlet pipe is connected to a water outlet of the drainage pump; the flap valve is connected to the water outlet tail end of the straight pipe type water outlet pipe; the ventilation straight pipe is connected to the straight pipe type water outlet pipe; and the exhaust valve is connected to the top end of the ventilation straight pipe. According to the ventilation device for the flap valve of the pump drainage system, through combined use of the ventilation straight pipe and the quick exhaust valve, the air inlet and exhaust requirements of a pipeline behind the flap valve of the pump drainage system are met, meanwhile, the limitation of the setting elevation of a traditional ventilation straight pipe is broken through, the construction difficulty of a pump station is reduced, and the attractive design of the overall shape of the pump station is facilitated; in addition, due to the working characteristics of the quick exhaust valve, a large amount of water flow in the ventilation device is prevented from overflowing and splashing under any working condition, and the surrounding environment is prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering, and more specifically, relates to a ventilation device for a flap valve of a pump drainage system. Background Art

[0002] For a pump drainage system with a straight pipe type outlet flow channel, it is usually necessary to use a flap valve to cut off the flow at the outlet of the flow channel, and at the same time, an air vent is arranged at a higher position of the pipe behind the flap valve, so as to discharge the air in the outlet flow channel when the unit starts, reduce the water flow pulsation pressure; when the unit stops, it can also supply air to the flow channel, avoid generating negative pressure in the flow channel, reduce the impact force when closing the flap valve, and improve the working conditions of the flow channel and the flap valve.

[0003] For the air vent, the traditional method is to set a vertical ventilation pipe at the high point of the pipe behind the flap valve. The vertical ventilation pipe extends vertically upward to a certain elevation. The set elevation needs to consider the head of the pump system and the peak value of the pressure pulsation during the start-up and shutdown processes. For a system with a larger pump head, the set elevation of the vertical ventilation pipe is higher, which increases the construction difficulty. And some pumping stations may not have the condition to set a vertical ventilation pipe with a higher elevation due to site conditions restrictions, or the higher vertical ventilation pipe will affect the overall aesthetics of the pumping station. In particular, during extreme processes such as start-up and shutdown, the flow state of the water flow in the pump outlet flow channel changes sharply, and the water flow carrying gas will spray or splash out from the vertical ventilation pipe, causing damage to the surrounding environment. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a ventilation device for a flap valve of a pump drainage system, so as to break through the limitation of the set elevation of the traditional vertical ventilation pipe while ensuring the air intake and exhaust requirements of the pipeline behind the flap valve of the pump drainage system by the combined use of the vertical ventilation pipe and the quick exhaust valve, which is convenient for the aesthetic design of the overall shape of the pumping station; in addition, due to the working characteristics of the quick exhaust valve, it also avoids a large amount of overflow and splash of water flow in the ventilation device under any working conditions, and avoids damage to the surrounding environment.

[0005] To achieve the above object, the utility model provides a ventilation device for a flap valve of a pump drainage system, including:

[0006] A drainage pump;

[0007] A straight pipe type outlet water pipe, connected to the water outlet of the drainage pump;

[0008] A flap valve, connected to the water outlet end of the straight pipe type outlet water pipe;

[0009] A vertical ventilation pipe, connected to the straight pipe type outlet water pipe; and,

[0010] An exhaust valve, connected to the top end of the vertical ventilation pipe.

[0011] Further, it further includes a maintenance gate valve, and the maintenance gate valve is connected to the ventilation straight pipe and is located below the exhaust valve.

[0012] Further, the cross-sectional area S of the ventilation straight pipe satisfies S≥(0.015 - 0.03)A, where A is the cross-sectional area of the straight pipe type outlet pipe.

[0013] Further, the elevation of the ventilation straight pipe above the ground is as low as 100 mm.

[0014] Further, the ventilation straight pipe is arranged within a distance of 0.5 m from the end face of the flap gate.

[0015] Further, the exhaust valve is an in-built floating type automatic exhaust valve.

[0016] Compared with the prior art, the present utility model has the following technical effects:

[0017] A ventilation device for a flap gate of a pump drainage system of the present utility model can freely set the installation elevation of the ventilation straight pipe according to the actual situation of the pump station by connecting the ventilation straight pipe to the straight pipe type outlet pipe and installing an exhaust valve at the top of the ventilation straight pipe, greatly improving the flexibility of the ventilation device of the pump drainage system flap gate and its adaptability to different site conditions, reducing the construction difficulty of the pump station, especially significant in pump stations with large terrain or space limitations.

[0018] Due to the freely adjustable installation elevation of the exhaust valve, the layout of the exhaust system can be reasonably designed, avoiding the visual abruptness caused by the need to set the ventilation straight pipe to a relatively high elevation in the traditional design, thus enhancing the overall aesthetics of the pump station.

[0019] The exhaust valve can automatically adjust the opening and closing according to the internal pressure change of the pump drainage system, effectively manage the air flow, and ensure the smoothness of the gas passage. When the unit starts, it quickly discharges the air in the water flow channel, reduces the water flow pulsation pressure, and helps the unit to start smoothly; when the unit stops, it inhales air in time, reducing the impact force when the flap gate closes.

[0020] In view of the sharp change in water flow pattern that may occur under extreme working conditions such as unit startup and shutdown, due to the structural characteristics of the rapid exhaust of the exhaust valve, it can effectively prevent a large amount of water from overflowing and splashing from the ventilation straight pipe; at the same time, it prevents foreign objects from entering the ventilation device, thus avoiding damage to the surrounding environment and potential safety hazards.

[0021] A ventilation device for a flap gate of a pump drainage system of the present utility model not only improves the flexibility and aesthetics of the pump drainage ventilation system design, but also enhances the stability and safety of the pump drainage system, providing a strong technical reference for the design of the same type of pump drainage system. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of a ventilation device for a flap in a pump drainage system provided by an embodiment of the present invention.

[0024] Among them, the reference numerals in the drawings are as follows:

[0025] 1. Straight pipe type outlet pipe, 2. Flap, 3. Ventilation straight pipe, 4. Maintenance gate valve, 5. Exhaust valve. Specific embodiments

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or positional relationship indicated by the terms "length", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0030] Please refer to Figure 1 , and now a ventilation device for a flap in a pump drainage system provided by an embodiment of the present invention will be described.

[0031] In an embodiment of the present utility model, a ventilation device for a flap of a pump drainage system according to an embodiment of the present utility model includes a drainage pump, a straight pipe type outlet pipe 1, a flap 2, a ventilation straight pipe 3, and an exhaust valve 5. The straight pipe type outlet pipe 1 is connected to the water outlet of the drainage pump; the flap 2 is connected to the water outlet end of the straight pipe type outlet pipe 1; the ventilation straight pipe 3 is connected to the straight pipe type outlet pipe 1; and the exhaust valve 5 is connected to the top end of the ventilation straight pipe 1.

[0032] For a pump drainage system with a straight pipe type water outlet channel, the traditional method is to set a ventilation pipe at the high point of the pipe behind the flap 2, and the ventilation pipe extends vertically upward to a certain elevation. For a system with a relatively high pump head, the installation elevation of its ventilation pipe is relatively high, which increases the construction difficulty. Some pumping stations may not have the condition to set a high elevation ventilation pipe due to site conditions, or a relatively high ventilation pipe may affect the overall aesthetics of the pumping station. In particular, during extreme processes such as starting and stopping the machine, the flow state of the water flow in the pump outlet channel changes sharply, and the water flow carrying gas will spray or splash out from the ventilation pipe, causing damage to the surrounding environment.

[0033] In the embodiment of the present invention, by connecting the ventilation straight pipe 3 to the straight pipe type outlet pipe 1 and installing the exhaust valve 5 at the top end of the ventilation straight pipe 3, the installation elevation of the ventilation straight pipe 3 can be freely set according to the actual situation of the pumping station, greatly improving the flexibility of the ventilation device for the flap of the pump drainage system and its adaptability to different site conditions, and reducing the construction difficulty of the pumping station, especially significant in pumping stations with large terrain or space restrictions.

[0034] Due to the free adjustability of the installation elevation of the exhaust valve 5, the layout of the exhaust system can be reasonably designed, avoiding the visual abruptness caused by the need to set the ventilation straight pipe 3 to a relatively high elevation in the traditional design, thereby improving the overall aesthetics of the pumping station.

[0035] The exhaust valve 5 can automatically adjust the opening and closing according to the internal pressure change of the pump drainage system, effectively manage the air flow, and ensure the smoothness of the gas passage. When the unit starts, it quickly discharges the air in the water outlet channel, reduces the water flow pulsation pressure, and helps the unit start smoothly; when the unit stops, it timely inhales air, reducing the impact force when the flap 2 closes.

[0036] In response to the sharp change in the water flow state that may occur under extreme working conditions such as starting and stopping the unit, due to the structural characteristics of the rapid exhaust of the exhaust valve 5, it can effectively prevent a large amount of overflow and splash of the water flow from the ventilation straight pipe 3; at the same time, it prevents sundries from entering the ventilation device, thus avoiding damage to the surrounding environment and potential safety hazards.

[0037] Further, an air venting device for a flap valve in a pump drainage system according to an embodiment of the present utility model further includes a maintenance gate valve 4, which is connected to the ventilation straight pipe 3 and is located below the exhaust valve 5. When the drainage system is operating normally, the maintenance gate valve 4 is in an open state, and the exhaust valve 5 discharges a large amount of air in the water flow passage, reducing the water flow pulsation pressure; when the exhaust valve 5 needs to be replaced or maintained, the maintenance gate valve 4 is closed. Both the maintenance gate valve 4 and the exhaust valve 5 have the same diameter as the ventilation straight pipe 3.

[0038] Further, the cross-sectional area S of the ventilation straight pipe 3 in this embodiment satisfies S≥(0.015 - 0.03)A, where A is the cross-sectional area of the straight pipe type outlet pipe 1, so as to better meet the requirement of rapid air exhaust inside the drainage system.

[0039] Further, the elevation of the ventilation straight pipe 3 in this embodiment above the ground is as low as 100 mm, that is, the elevation of the ventilation straight pipe 3 in this embodiment above the ground can be designed to be 100 mm, ensuring that the maintenance gate valve 4 and the exhaust valve 5 above it can be normally installed and operated. This embodiment can greatly reduce the elevation of the ventilation straight pipe 3 above the ground, reduce the construction difficulty, and improve the overall aesthetics of the pumping station.

[0040] Further, the ventilation straight pipe 3 in this embodiment is arranged within a distance of 0.5 m from the end face of the flap valve 2, so as to suck in air in time when the drainage pump stops, reducing the impact force when the flap valve 2 closes.

[0041] Further, the exhaust valve 5 in this embodiment is an internal floating - type automatic exhaust valve, that is, the exhaust valve 5 is internally provided with control elements such as a floating cylinder. The exhaust valve 5 is installed at the highest point of the ventilation straight pipe 3, which can quickly discharge the gas in the pipeline. At the same time, when there is a negative pressure in the pipeline, it sucks in a large amount of air; when the water level in the pipeline rises to the exhaust valve 5, the floating cylinder floats up and the air intake and exhaust holes are closed to prevent water from overflowing. The exhaust valve 5 can automatically adjust its opening and closing according to the internal pressure change of the pump drainage system, realizing precise air flow management and ensuring the smoothness of the gas passage. When the unit starts, the exhaust valve 5 discharges a large amount of air in the water flow passage, reducing the water flow pulsation pressure; when the unit stops, when there is a negative pressure in the water flow passage, it sucks in a large amount of air, reducing the impact force when closing the flap valve 2 and improving the working conditions of the flow passage and the flap valve 2; when the unit is operating normally or the water flow pattern in the flow passage changes sharply, even if the water head in the ventilation straight pipe 3 is higher than the fast exhaust valve 5, due to the structural characteristics of the fast exhaust valve 5, it can ensure that the water in the water flow passage does not overflow or splash outwards in large amounts, thus avoiding damage to the surrounding environment and potential safety hazards.

[0042] The above embodiments only illustrate several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A ventilation device for a flap door of a pump drainage system, characterized in that: include: Drain pump; A straight water outlet pipe connected to the water outlet of the drainage pump; A flap door connected to the water outlet end of the straight pipe water outlet pipe; a ventilation straight pipe connected to the straight water outlet pipe; and An exhaust valve is connected to the top end of the ventilation straight pipe.

2. A ventilation device for a flap door of a pump drainage system as claimed in claim 1, characterized in that: It also includes a maintenance gate valve, which is connected to the ventilation straight pipe and is located at the lower side of the exhaust valve.

3. A ventilation device for a flap door of a pump drainage system as claimed in claim 1, characterized in that: The cross-sectional area S of the ventilation straight pipe is ≥ (0.015-0.03) A, where A is the cross-sectional area of ​​the straight pipe water outlet pipe.

4. A ventilation device for a flap door of a pump drainage system as claimed in claim 1, characterized in that: The height of the straight ventilation pipe above the ground is as low as 100 mm.

5. A ventilation device for a flap door of a pump drainage system as claimed in claim 1, characterized in that: The straight ventilation pipe is arranged within a distance of 0.5 m from the end face of the flap door.

6. A ventilation device for a flap door of a pump drainage system as claimed in any one of claims 1 to 5, characterized in that: The exhaust valve is a built-in float type automatic exhaust valve.

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