Pressure regulating chamber structure capable of rapidly attenuating surge water level

Abstract

The surge chamber structure capable of rapidly attenuating the surge water level mainly comprises a pressure tunnel, a first small well, a second small well and a valve. Wherein the length direction of the pressure tunnel extends in the preset direction; the first small well is located above the pressure tunnel, the first small well communicates with the pressure tunnel, and the first small well has preset water storage capacity; the second slim well is located above the pressure tunnel, the second slim well is communicated with the pressure tunnel, the second slim well has preset water storage capacity, and the upper portion of the second slim well is communicated with the upper portion of the first slim well; the valve is used for controlling on-off of a flow path and the flow direction of water, and the water flows in a one-way mode from the pressure tunnel to the first small well and from the second small well to the pressure tunnel. The surge chamber structure capable of rapidly attenuating the surge water level not only can meet the design requirement for adjustment guarantee of a hydropower station, but also can achieve the effect of rapidly attenuating and stabilizing the water level in the surge chamber, so that the operation flexibility of a power station unit can be improved.

Description

Technical Field

[0001] This application relates to the technical field of water conservancy and hydropower engineering, and particularly relates to a surge chamber structure with rapid decay of surge water level. Background Art

[0002] In a long diversion type hydropower station's water conveyance and power generation system, it is often necessary to set up a surge chamber to reduce the water hammer pressure and improve the operating conditions of the units. When the unit load changes, the water level in the surge chamber fluctuates. However, generally, the water level fluctuation period in the surge chamber is long and the decay is slow, taking dozens of minutes or even several hours to stabilize, seriously affecting the operating flexibility of the units. Some power stations have thus set up manual intervention methods to increase the decay rate of the surge chamber water level, but this has increased the difficulty of unit operation scheduling. Therefore, it is necessary to propose a surge chamber structure that can improve the operating flexibility of the power station units. Utility Model Content

[0003] The embodiment of this application provides a surge chamber structure with rapid decay of surge water level. This surge chamber structure can not only meet the design requirements of regulating guarantee for hydropower stations, but also achieve the effect of rapid decay and stability of the water level in the surge chamber, thereby improving the operating flexibility of the power station units.

[0004] The surge chamber structure with rapid decay of surge water level provided by the embodiment of this application includes: a pressure tunnel, the length direction of the pressure tunnel extends along a preset direction;

[0005] A first small well, the first small well is located above the pressure tunnel, the first small well is communicated with the pressure tunnel, and the first small well has a preset water storage capacity;

[0006] A second small well, the second small well is located above the pressure tunnel, the second small well is communicated with the pressure tunnel, and the second small well has a preset water storage capacity, and the upper part of the second small well is communicated with the upper part of the first small well;

[0007] A valve member, the valve member is used to control the on-off of the flow path and the water flow direction, and the water flow direction is a one-way flow from the pressure tunnel to the first small well and from the second small well to the pressure tunnel.

[0008] In addition, the surge chamber structure provided by the embodiment of this application may also have the following additional technical features:

[0009] In an optional solution, the surge chamber structure includes a large well and a partition wall;

[0010] The partition wall is located in the large well and divides the large well to form the first small well and the second small well, and the top elevation of the partition wall is lower than the top elevation of the large well.

[0011] In an alternative solution, the valve member includes a first check valve and a second check valve;

[0012] The first small well is communicated with the pressure tunnel through a first connecting pipe, the first check valve is arranged on the first connecting pipe, the second small well is communicated with the pressure tunnel through a second connecting pipe, and the second check valve is arranged on the second connecting pipe.

[0013] In an alternative solution, the surge chamber structure has a first working state. In the first working state, the first check valve is opened and the second check valve is closed; water body enters the first small well from the pressure tunnel.

[0014] In an alternative solution, the surge chamber structure has a second working state. In the second working state, the first check valve is closed and the second check valve is opened; water body enters the pressure tunnel from the second small well.

[0015] The beneficial effects of the embodiments of the present application are as follows:

[0016] On the premise of reflecting the water hammer wave by the conventional impedance type surge chamber, the surge chamber structure can rapidly decay the surge water level of the surge chamber, avoid the long-term fluctuation of the water level in the surge chamber, affect the stability of the output of the operating unit and the adverse impact on the subsequent unit startup, improve the operation stability of the water conveyance system, and ensure the power supply quality of the unit.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional view of the surge chamber structure provided by the present application in a specific embodiment;

[0019] Figure 2 is a schematic diagram when the water level in the small well of the surge chamber rises after the unit suddenly loses load;

[0020] Figure 3 is a schematic diagram when the water level in the large well of the surge chamber rises after the unit suddenly loses load;

[0021] Figure 4 is a schematic diagram when the water level in the large well of the surge chamber is the highest after the unit suddenly loses load;

[0022] Figure 5 is a schematic diagram when the water level in the large well of the surge chamber drops after the unit suddenly loses load;

[0023] Figure 6 is a schematic diagram when the water level in the small well of the surge chamber drops after the unit suddenly loses load;

[0024] Figure 7The figure provided for this application shows the comparison of numerical calculation results with a conventional impedance surge chamber.

[0025] Reference numerals: large well 1, first connecting pipe 2, second connecting pipe 3, pressure tunnel 4, partition wall 5, first small well 6, second small well 7, first check valve 8, second check valve 9.

[0026] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in line with this application, and are used together with the specification to explain the principles of this application. Detailed implementation manners

[0027] 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.

[0028] It should be clear that the described embodiments are only part of the embodiments of this application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope protected by this application.

[0029] The terms used in the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms "a", "the" and "said" 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.

[0030] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0031] It should be noted that the orientation terms such as "upper", "lower", "left" and "right" described in the embodiments of this application are described from the angles shown in the accompanying drawings and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0032] Such as Figure 1-7As shown in the figure, an air chamber structure for rapidly attenuating the surge water level is provided in an embodiment of the present application. The air chamber structure mainly includes a pressure tunnel 4, a first small well 6, a second small well 7, and valve components. Among them, the length direction of the pressure tunnel 4 extends along a preset direction; the first small well 6 is located above the pressure tunnel 4, the first small well 6 is communicated with the pressure tunnel 4, and the first small well 6 has a preset water storage capacity; the second small well 7 is located above the pressure tunnel 4, the second small well 7 is communicated with the pressure tunnel 4, and the second small well 7 has a preset water storage capacity, and the upper part of the second small well 7 is communicated with the upper part of the first small well 6; the valve components are used to control the on-off of the flow path and the water flow direction, and the water flow direction is the one-way flow from the pressure tunnel 4 to the first small well 6 and from the second small well 7 to the pressure tunnel 4.

[0033] In the air chamber structure in the embodiment of the present application, on the premise of reflecting the water hammer wave of a conventional impedance type air chamber, the surge water level of the air chamber can be rapidly attenuated, avoiding the long-term fluctuation of the air chamber water level, the adverse effects on the output stability of the operating unit and the subsequent start-up of the unit, improving the operation stability of the water conveyance system, and ensuring the power supply quality of the unit.

[0034] As Figure 1-6 shown, in a specific embodiment, the air chamber structure includes a large well 1 and a partition wall 5; the partition wall 5 is located in the large well 1 and divides the large well 1 to form a first small well 6 and a second small well 7, that is, the partition wall 5 divides the lower part of the large well 1 into the first small well 6 and the second small well 7, the top elevation of the partition wall 5 is higher than the normal operating water level and lower than the top elevation of the large well 1.

[0035] As Figure 1-6 shown, in a specific embodiment, the valve components include a first check valve 8 and a second check valve 9; the first small well 6 is communicated with the pressure tunnel 4 through a first connecting pipe 2, the first check valve 8 is arranged on the first connecting pipe 2, the second small well 7 is communicated with the pressure tunnel 4 through a second connecting pipe 3, and the second check valve 9 is arranged on the second connecting pipe 3.

[0036] As Figure 2-6 shown, in a specific embodiment, the air chamber structure has a first working state. In the first working state, the first check valve 8 is opened and the second check valve 9 is closed; the water body enters the first small well 6 from the pressure tunnel 4. In addition, the air chamber structure also has a second working state. In the second working state, the first check valve 8 is closed and the second check valve 9 is opened; the water body enters the pressure tunnel 4 from the second small well 7.

[0037] Specifically, the working principles of the air chamber structure in the first working state and the second working state are as follows:

[0038] As Figure 2As shown in the figure, when the unit suddenly unloads, due to the influence of the water hammer wave, the pressure in the pressure tunnel 4 rises and is higher than the pressure during normal operation. At this time, the first check valve 8 opens, and the first connecting pipe 2 is equivalent to an impedance orifice and can play a role in reflecting the water hammer. The water flow flows from the pressure tunnel 4 into the first small well 6, and the water level of the first small well 6 rises until it reaches the top of the partition wall 5. At this time, the water level of the second small well 7 remains unchanged.

[0039] As Figure 3 shown, the water level of the first small well 6 continues to rise, exceeds the top elevation of the partition wall 5 and overflows to the second small well 7 through the top of the partition wall 5. The water level of the second small well 7 gradually rises until the water levels of the first small well 6 and the second small well 7 gradually reach the same level in the large well 1 and rise synchronously.

[0040] When the water level of the surge chamber large well 1 reaches the highest, as Figure 4 shown, due to the reflection of the water hammer wave, the pressure in the pressure tunnel 4 decreases and is lower than the water level of the surge chamber large well 1. At this time, the first check valve 8 closes, and the second check valve 9 opens. The water level of the large well 1 gradually drops until the water level synchronously drops to the top elevation of the partition wall 5, as Figure 5 shown; thereafter, due to the closing of the first check valve 8 and the opening of the second check valve 9, the water level of the first small well 6 will no longer change, and the water level of the second small well 7 continues to gradually decrease, as Figure 6 shown.

[0041] Due to the characteristics of the water hammer wave, the pressure in the pressure tunnel 4 gradually decays, and due to the relatively high water pressure in the first small well 6, there will be no large water level fluctuations in the large well 1 of the surge chamber structure, and the pressure in the pressure tunnel 4 gradually decays until it stabilizes.

[0042] As Figure 7 shown, this is the comparison of the surge water level fluctuations of the surge chamber structure in this embodiment during the hydraulic transient process with the numerical simulation results of the surge water level fluctuations of the conventional impedance type surge chamber. Combining Figure 7 it can be seen that the attenuation speed of the water level fluctuations of the surge chamber in this embodiment is significantly faster.

[0043] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A surge chamber structure with rapid attenuation of surge water level, characterized in that: include: A pressurized tunnel, wherein the length direction of the pressurized tunnel extends along a preset direction; A first small well, wherein the first small well is located above the pressure tunnel, the first small well is connected to the pressure tunnel, and the first small well has a preset water storage capacity; A second small well, wherein the second small well is located above the pressure tunnel, the second small well is connected to the pressure tunnel, and the second small well has a preset water storage capacity, and the upper part of the second small well is connected to the upper part of the first small well; A valve component is used to control the on-off of the flow path and the flow direction of the water body, and the flow direction of the water body is a one-way flow from the pressurized tunnel to the first small well, and from the second small well to the pressurized tunnel.

2. The surge chamber structure for rapid attenuation of surge water level according to claim 1 is characterized in that: The surge chamber structure includes a large well and a partition wall; The partition wall is located in the large well and separates the large well to form the first small well and the second small well, and the top elevation of the partition wall is lower than the top elevation of the large well.

3. The surge chamber structure for rapid attenuation of surge water level according to claim 1 or 2, characterized in that: The valve member comprises a first check valve and a second check valve; The first small well is connected to the pressurized tunnel through a first connecting pipe, the first check valve is arranged on the first connecting pipe, the second small well is connected to the pressurized tunnel through a second connecting pipe, and the second check valve is arranged on the second connecting pipe.

4. The surge chamber structure for rapid attenuation of surge water level according to claim 3 is characterized in that: The pressure regulating chamber structure has a first working state. In the first working state, the first check valve is opened and the second check valve is closed; water enters the first small well from the pressurized tunnel.

5. The surge chamber structure for rapid attenuation of surge water level according to claim 3 is characterized in that: The pressure regulating chamber structure has a second working state. In the second working state, the first check valve is closed and the second check valve is opened; water enters the pressurized tunnel from the second small well.

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