Negative pressure adjusting structure of water conveying pipeline

Abstract

The negative pressure adjusting structure of the water conveying pipeline comprises an adjusting water tank, a water filling pipeline and a water supplementing pipeline, the adjusting water tank is arranged near the high point position of the water conveying pipeline, and a water body with a preset water level is stored in the adjusting water tank; a pipe orifice, on one side of the adjusting water tank, of the water filling pipeline is higher than a preset water level; the water supplementing pipeline is communicated with the water conveying pipeline and the adjusting water tank and configured to perform one-way water supplementing from the adjusting water tank to the water conveying pipeline, and a water inlet, on one side of the adjusting water tank, of the water supplementing pipeline is lower than a preset water level. According to the negative pressure adjusting structure of the water conveying pipeline, suction of air can be reduced while negative pressure generated by the pipeline is avoided, and therefore the probability of secondary accidents such as water hammer bridging is reduced.

Description

A negative pressure regulating structure for water transmission pipelines Technical Field

[0001] This application relates to the field of water conservancy and hydropower engineering technology, specifically to a negative pressure regulating structure for a water transmission pipeline. Background Technology

[0002] Long-distance water transmission pipelines are typically laid out along the terrain. Due to terrain constraints, there are many high points along the pipeline route. During hydraulic transitions, negative pressure can easily form at these high points, and improper handling can lead to pipeline collapse accidents. Currently, air venting valves are generally installed at high points along the pipeline. When negative pressure occurs, the venting valves release air into the pipeline to prevent excessive negative pressure. However, this method of using air venting valves at high points to prevent excessive negative pressure can easily lead to a large accumulation of air inside the pipeline. If the gas cannot be released in time, it can easily cause secondary accidents such as water hammer. Summary of the Invention

[0003] This application provides a negative pressure regulating structure for a water transmission pipeline. This negative pressure regulating structure can reduce the intake of air while avoiding the generation of negative pressure in the pipeline, thereby reducing the probability of secondary accidents such as water hammer.

[0004] The negative pressure regulating structure for the water transmission pipeline provided in this application includes: a regulating water tank, which is located near the high point of the water transmission pipeline and contains water at a preset water level.

[0005] A water filling pipe, which connects the water supply pipe and the regulating water tank, and the opening of the water filling pipe on one side of the regulating water tank is higher than the preset water level;

[0006] A water supply pipe is provided, which connects the water delivery pipe and the regulating water tank. The water supply pipe is configured to provide unidirectional water supply from the regulating water tank to the water delivery pipe. The inlet of the water supply pipe on one side of the regulating water tank is lower than a preset water level.

[0007] In addition, the negative pressure regulating structure for the water transmission pipeline provided in this application may also have the following additional technical features:

[0008] In one optional embodiment, the water supply pipeline is equipped with an air inlet and outlet valve, the water filling pipeline is equipped with a liquid level working valve and a liquid level maintenance valve, and the regulating water tank is equipped with a liquid level sensor, which is connected to the liquid level working valve via data connection. When the water level in the regulating water tank is lower than the preset water level, the liquid level sensor controls the liquid level working valve to open, and the water in the water supply pipeline is injected into the regulating water tank through the water filling pipeline.

[0009] In one alternative embodiment, the water supply pipe is equipped with a check valve, an expansion joint, and a maintenance valve; a valve chamber is provided on the side of the regulating water tank near the water supply pipe, and the valves on the water supply pipe, the water filling pipe, and the water supply pipe are respectively located in the valve chamber.

[0010] In one alternative embodiment, the bottom of the regulating water tank and the valve chamber are located below the ground line, and an inspection cover is provided on one side of the top of the valve chamber and the regulating water tank. The side of the valve chamber near the bottom is connected to the outside through a valve chamber drain pipe.

[0011] In one alternative embodiment, the water filling pipe is fixed to the side wall of the regulating water tank by a pipe clamp, and ladders are provided on both the outer and inner walls of the regulating water tank.

[0012] The beneficial effects of this application are as follows:

[0013] When the negative pressure regulating structure of this application is in operation, if the water pressure in the water supply pipeline is low and negative pressure occurs, the water in the regulating pool can flow to the water supply pipeline through the water replenishment pipe, thereby improving the negative pressure situation in the water supply pipeline and ensuring the safety of the water supply pipeline. At the same time, the method of replenishing the water supply pipeline can also effectively prevent the water supply pipeline from sucking in a large amount of air after negative pressure occurs, thereby reducing the probability of secondary accidents such as water hammer. The water filling pipe can transport the water in the water supply pipeline to the regulating pool when the pressure in the water supply pipeline is normal, thereby replenishing the regulating pool.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the negative pressure regulating structure provided in this application in a specific embodiment;

[0016] Figure 2 is a cross-sectional view of the negative pressure adjustment structure in Figure 1 at point AA.

[0017] Figure 3 is a cross-sectional view of the negative pressure adjustment structure in Figure 1 at point BB.

[0018] Attached reference numerals: 1. Regulating water tank; 11. Liquid level sensor; 12. Ladder; 2. Water supply pipe; 21. Inlet and outlet valve; 3. Water filling pipe; 32. Liquid level working valve; 31. Liquid level inspection valve; 33. Pipe clamp; 4. Water supply pipe; 41. Check valve; 42. Expansion joint; 43. Inspection valve; 5. Valve chamber; 51. Valve chamber drain pipe; 6. Ground line; 7. Inspection cover plate.

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0020] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0025] As shown in Figures 1-3, this application embodiment provides a negative pressure regulating structure for a water supply pipeline. This structure mainly includes a regulating water tank 1, a filling pipe 3, and a replenishing water pipe 4. The regulating water tank 1 is located near the highest point of the water supply pipeline 2 and stores water at a preset level. The filling pipe 3 connects the water supply pipeline 2 and the regulating water tank 1, with its inlet on one side of the regulating water tank 1 higher than the preset water level. The replenishing water pipe 4 connects the water supply pipeline 2 and the regulating water tank 1, and is configured to unidirectionally replenish water from the regulating water tank 1 to the water supply pipeline 2. The inlet of the replenishing water pipe 4 on one side of the regulating water tank 1 is lower than the preset water level.

[0026] In this embodiment, when the negative pressure regulating structure is in operation, if the water pressure in the water supply pipe 2 is low and negative pressure occurs, the water in the regulating pool 1 can flow to the water supply pipe 2 through the water replenishment pipe 4, thereby improving the negative pressure situation in the water supply pipe 2 and ensuring the safety of the water supply pipe 2. At the same time, replenishing the water supply pipe 2 can also effectively prevent the water supply pipe 2 from sucking in a large amount of air after negative pressure is generated, thereby reducing the probability of secondary accidents such as water hammer. The water filling pipe 3 can transport the water in the water supply pipe 2 to the regulating pool 1 when the pressure in the water supply pipe 2 is normal, thereby replenishing the regulating pool 1.

[0027] As shown in Figures 1-2, in one specific embodiment, an air inlet / outlet valve 21 is provided on the water supply pipeline 2, a liquid level working valve 32 and a liquid level inspection valve 31 are provided on the water filling pipeline 3, and a liquid level sensor 11 is provided in the regulating water tank 1. The liquid level sensor 11 is connected to the liquid level working valve 32 for data transmission. When the water in the regulating water tank 1 is lower than the preset water level, the liquid level sensor 11 controls the liquid level working valve 32 to open, and the water in the water supply pipeline 2 is injected into the regulating water tank 1 through the water filling pipeline 3.

[0028] As shown in Figures 1 and 3, in one specific embodiment, the water supply pipe 4 is equipped with a check valve 41, an expansion joint 42, and a maintenance valve 43; the regulating water tank 1 is equipped with a valve chamber 5 on the side near the water supply pipe 2, and the valves on the water supply pipe 2, the water filling pipe 3, and the water supply pipe 4 are respectively located in the valve chamber 5. The valves mentioned here include an air inlet / outlet valve 21, a liquid level working valve 32, a liquid level maintenance valve 31, a check valve 41, an expansion joint 42, and a maintenance valve 43, etc.

[0029] Specifically, the arrangement and operating principle of the negative pressure regulating structure in this embodiment are as follows:

[0030] A regulating reservoir 1 is constructed near the highest point of the water transmission pipeline 2. Two types of steel pipes are connected to the water transmission pipeline 2 via a T-connection: one for filling the regulating reservoir 1 (filling pipe 3), and the other for replenishing the water transmission pipeline 2 from the regulating reservoir 1 (replenishment pipe 4). The outlet of the filling pipe 3 is set at a higher elevation, and a level control valve 32 and a level maintenance valve 31 are installed on the pipe. Both valves are normally closed and are used to control the filling of the reservoir. The outlet of the replenishment pipe 4 is set at a lower elevation, and a maintenance valve 43 and a check valve 41 are installed on the replenishment pipe 4. The check valve 41 only allows water from the regulating reservoir 1 to flow into the water transmission pipeline 2 for replenishment, but does not allow water from the water transmission pipeline 2 to flow into the regulating reservoir 1.

[0031] In addition, the water level of the regulating pool 1 is automatically monitored by the liquid level sensor 11. The monitoring signal of the liquid level sensor 11 is linked with the opening and closing of the liquid level working valve 32 on the water filling pipe 3 to achieve automatic control, so that the water level in the regulating pool 1 is kept within a reasonable range. When the water level of the regulating pool 1 reaches the preset minimum water level, the liquid level working valve 32 on the water filling pipe 3 automatically opens to fill the regulating pool 1 with water; when the water level of the pool reaches the preset maximum water level, the liquid level working valve 32 on the water filling pipe 3 automatically closes to stop filling the pool with water.

[0032] As shown in Figures 2-3, in one specific embodiment, the bottoms of the regulating water tank 1 and the valve chamber 5 are located below the ground line 6, and the sides of the regulating water tank 1 and the valve chamber 5 are backfilled with soil and rock between them and the excavated pit. A maintenance cover 7 is provided on one side of the top of the valve chamber 5 and the regulating water tank 1, allowing for easy manual inspection and maintenance of the components inside the valve chamber 5 and the regulating water tank 1. The bottom side of the valve chamber 5 is connected to the outside via a valve chamber drain pipe 51, allowing any leakage water inside the valve chamber 5 to be discharged through the drain pipe 51. Additionally, the water filling pipe 3 is fixed to the side wall of the regulating water tank 1 by a pipe clamp 33. Ladders 12 are provided on both the outer and inner walls of the regulating water tank 1, allowing workers to easily enter the regulating water tank 1.

[0033] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A negative pressure regulating structure for a water transmission pipeline, characterized in that, include: A regulating water tank is located near the high point of the water supply pipeline, and the regulating water tank stores water at a preset water level. A water filling pipe connects the water supply pipe and the regulating water tank, and the inlet of the water filling pipe on the regulating water tank side is higher than a preset water level; a water replenishment pipe connects the water supply pipe and the regulating water tank, and the water replenishment pipe is configured to provide unidirectional water replenishment from the regulating water tank to the water supply pipe, and the inlet of the water replenishment pipe on the regulating water tank side is lower than a preset water level.

2. The negative pressure regulating structure for a water transmission pipeline according to claim 1, characterized in that, The water supply pipeline is equipped with an air inlet and outlet valve, the water filling pipeline is equipped with a liquid level working valve and a liquid level maintenance valve, and the regulating water tank is equipped with a liquid level sensor, which is connected to the liquid level working valve. When the water in the regulating water tank is lower than the preset water level, the liquid level sensor controls the liquid level working valve to open, and the water in the water supply pipeline is injected into the regulating water tank through the water filling pipeline.

3. The negative pressure regulating structure for a water transmission pipeline according to claim 2, characterized in that, The water supply pipeline is equipped with a check valve, an expansion joint, and a maintenance valve; a valve chamber is provided on the side of the regulating water tank near the water supply pipeline, and the valves on the water supply pipeline, the water filling pipeline, and the water supply pipeline are respectively located in the valve chamber.

4. The negative pressure regulating structure for a water transmission pipeline according to claim 3, characterized in that, The bottom of the regulating water tank and the valve chamber are located below the ground line, and an inspection cover is provided on one side of the top of the valve chamber and the regulating water tank. The side of the valve chamber near the bottom is connected to the outside through the valve chamber drain pipe.

5. The negative pressure regulating structure for a water transmission pipeline according to any one of claims 1-4, characterized in that, The water filling pipe is fixed to the side wall of the regulating water tank by a pipe clamp, and ladders are provided on both the outer and inner walls of the regulating water tank.

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