Pressure regulating chamber structure with variable impedance hole and pressure pipeline structure

Abstract

The utility model relates to a surge chamber structure with variable impedance holes and a pressure pipeline structure. The utility model is suitable for the technical field of hydroelectric surge chambers. The pressure regulating chamber structure with the variable impedance hole is provided with a pressure regulating chamber body which is installed on a pressure pipeline, and the pressure regulating chamber body is communicated with the pressure pipeline through a water inlet channel. The regulating mechanism is mounted on the pressure regulating chamber body and is provided with a cavity mounted on the pressure regulating chamber body, a turntable is mounted in the cavity, the turntable extends into the pressure regulating chamber body and can block the water inlet channel, and at least two impedance holes with different diameters and smaller than the water inlet channel are formed in the turntable in the circumferential direction of the turntable; and a driving mechanism capable of driving the turntable to rotate is mounted on the cavity. When the driving mechanism drives the rotating disc to rotate, the rotating disc rotates to the positions, corresponding to the water inlet channels, of the impedance holes in the rotating disc, the size of the water inlet channels is adjusted, and the water inlet channels can be suitable for different pressure pipelines. And adjustment can be conveniently carried out according to the change of conditions in the pressure pipeline.

Description

Technical Field

[0001] This utility model relates to a pressure regulating chamber structure and a pressure pipeline structure with a variable impedance orifice. It is applicable to the field of hydroelectric pressure regulating chamber technology. Background Technology

[0002] In hydraulic and hydropower projects, surge tanks are commonly used to address water hammer problems during hydraulic transients. Extensive experience has been accumulated in the design and use of surge tanks in hydropower stations. Commonly used surge tank types include simple, impedance-type, water chamber type, differential type, overflow type, and air cushion type. Among these, the impedance-type surge tank is the most widely used. Its basic structure replaces the bottom of the cylindrical surge tank, where it connects to the tunnel and pressure pipeline, with a short pipe with a smaller cross-section or a baffle with a small orifice. This orifice or baffle generates local resistance, i.e., the impedance effect, when water flows through it.

[0003] A key characteristic of impedance-type surge tanks is that water loses some energy as it flows through the impedance orifice. This feature helps reduce the amplitude of water level fluctuations and accelerates the attenuation process, resulting in a smaller overall volume compared to cylindrical surge tanks. This means that it maintains lower head loss during normal operation, improving efficiency.

[0004] However, this design also has its limitations. Due to the impedance, when water hammer occurs, some of the water hammer waves cannot be completely reflected, which may affect the pressure intake channel, subjecting it to additional impact. Especially at the right-angle bend formed by the connection between the upper tunnel and the vertical shaft, the streamlines change sharply due to centrifugal force, causing continuous changes in dynamic water pressure in this area, forming a hydraulically unstable region. If the surge tank connecting pipe (i.e., the impedance hole) is connected to the tunnel in this region, the water flow may continuously enter and exit the surge tank due to the constantly changing pressure at the bottom of the surge tank, causing fluctuations in the surge tank water level and making it impossible to maintain a stable state. Such fluctuations will seriously affect the stable operation and regulation quality of the unit. Utility Model Content

[0005] The technical problem to be solved by this utility model is: In order to solve the above-mentioned technical problem, this utility model provides a pressure regulating chamber structure and a pressure pipeline structure with a variable impedance orifice.

[0006] The technical solution adopted in this utility model is: a voltage regulating chamber structure with a variable impedance orifice, which has the following characteristics:

[0007] The pressure regulating chamber is installed on the pressure pipeline, and the pressure regulating chamber is connected to the pressure pipeline through a water inlet channel.

[0008] The regulating mechanism is installed on the pressure regulating chamber body and has a chamber installed on the pressure regulating chamber body. A turntable is installed in the chamber body. The turntable extends into the pressure regulating chamber body and can block the water inlet channel. At least two impedance holes with different diameters and smaller than the water inlet channel are made on the turntable in the circumferential direction at the position corresponding to the water inlet channel. A drive mechanism that can drive the turntable to rotate is installed on the chamber body.

[0009] The drive mechanism has a drive motor mounted on the chamber, and a rotating shaft is mounted on the output shaft of the drive motor. The rotating shaft extends into the chamber and is connected to the turntable.

[0010] The chamber consists of a fixed base plate, a fixed top plate, and a sealing cover. The fixed base plate and the fixed top plate are fixedly installed on the pressure regulating chamber body. The turntable is arranged between the fixed base plate and the fixed top plate. The sealing cover is installed on the fixed base plate by bolts. The fixed top plate and the sealing cover are respectively provided with a first mating groove and a second mating groove at corresponding positions. When the sealing cover is installed on the fixed base plate, the first mating groove and the second mating groove are combined to form a mating hole that mates with the shaft hole.

[0011] The sealing cover is semi-circular, and the bolts are installed at the edge of the sealing cover along the circumferential direction. A support block that can cooperate with the top surface of the fixed base plate is installed at the lower end of the sealing cover, and a stop block that can cooperate with the side of the fixed base plate is installed on the support block.

[0012] A sealing gasket is placed between the support block and the fixed base plate.

[0013] A sealing ring is arranged between the fixed top plate and the sealing plate.

[0014] The turntable is provided with two sets of impedance holes. The first set of impedance holes has a circular cross-section, and the second set of impedance holes has a square cross-section.

[0015] The size of each impedance hole in the two sets of impedance holes gradually increases or decreases in a clockwise direction.

[0016] A pressure pipeline structure, employing the aforementioned pressure regulating chamber structure with a variable impedance orifice, includes an upper horizontal water inlet and a vertical water inlet shaft, connected by a bend pipe, wherein the pressure regulating chamber structure is installed on the bend pipe in the vertical direction.

[0017] The beneficial effects of this utility model are as follows: By installing an adjustment mechanism on the pressure regulating chamber body, the rotating disc inside the chamber can be driven by a drive motor. This allows the impedance holes of different sizes on the disc to rotate to the water inlet channel of the pressure regulating chamber body, facilitating the adjustment of the size of the water inlet channel between the pressure pipeline and the pressure regulating chamber body. This, in turn, adjusts the impedance effect of the pressure regulating chamber, improves the applicability of the pressure regulating chamber structure, and enables it to be applied to different pressure pipelines and to be easily adjusted according to changes in the conditions inside the pressure pipeline. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pressure pipeline structure in this utility model.

[0019] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0020] Figure 3 This is a top view of the turntable in this utility model.

[0021] Figure 4 This is a top view of the sealing cap in this utility model.

[0022] Among them: 1-pressure regulating chamber body, 2-water intake upper horizontal tunnel, 3-water intake vertical shaft, 4-bend pipe, 5-water inlet channel, 6-turntable, 7-drive motor, 8-impedance hole, 9-fixed base plate, 10-sealing cover, 11-sealing gasket, 12-sealing ring, 13-bolt. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0024] Example 1 is a voltage regulating chamber structure with a variable impedance orifice, which has:

[0025] Pressure regulating chamber 1 is installed on the pressure pipeline, and pressure regulating chamber 1 is connected to the pressure pipeline through water inlet channel 5;

[0026] The regulating mechanism, mounted on the pressure regulating chamber 1, has a chamber mounted on the pressure regulating chamber 1. A turntable 6 is installed inside the chamber, extending into the pressure regulating chamber 1 and capable of blocking the water inlet channel 5. At least two impedance holes 8, with different diameters and smaller than the water inlet channel 5, are formed on the turntable 6 along its circumference at positions corresponding to the water inlet channel 5. A drive mechanism is mounted on the chamber to drive the turntable 6 to rotate. Thus, when the drive mechanism drives the turntable 6 to rotate, the turntable 6 rotates until the impedance holes 8 on the turntable 6 move to positions corresponding to the water inlet channel 5 between the pressure regulating chamber 1 and the pressure pipeline, adjusting the size of the water inlet channel 5 to suit different pressure pipelines. This also facilitates adjustments based on changes in the conditions within the pressure pipeline.

[0027] Example 2 is a pressure regulating chamber structure with a variable impedance orifice. Based on Example 1, in this example, the drive mechanism has a drive motor 7 mounted on the chamber, and a rotating shaft is mounted on the output shaft of the drive motor 7. The rotating shaft extends into the chamber and is connected to the turntable 6. Thus, by running the drive motor 7, the rotating shaft and the turntable 6 can be driven to rotate.

[0028] The chamber consists of a fixed base plate 9, a fixed top plate, and a sealing cover 10. The fixed base plate 9 and the fixed top plate are fixedly installed on the pressure regulating chamber body 1. The turntable 6 is arranged between the fixed base plate 9 and the fixed top plate. The sealing cover 10 is installed on the fixed base plate 9 by bolts 13. The fixed top plate and the sealing cover 10 are respectively provided with a first mating groove and a second mating groove at corresponding positions. When the sealing cover 10 is installed on the fixed base plate 9, the first mating groove and the second mating groove are combined to form a mating hole that mates with the shaft hole.

[0029] The sealing cover 10 is semi-circular. The bolt 13 is installed at the edge of the sealing cover 10 along its circumferential direction. A support block that mates with the top surface of the fixed base plate 9 is installed at the lower end of the sealing cover 10. A stop block that mates with the side surface of the fixed base plate 9 is installed on the support block. Thus, the sealing cover 10 is easily installed on the fixed base plate 9 by the bolt 13. When the sealing cover 10 is installed on the fixed base plate 9, the sealing cover 10 can contact the fixed top plate under the action of the stop block and the fixed base plate 9. The second mating groove on the sealing cover 10 and the first mating groove on the fixed top plate form a mating hole, which facilitates the limiting function of the rotating shaft. At the same time, when the sealing cover 10 is removed from the fixed base plate 9, it is also convenient to remove the rotating shaft and the turntable 6 from the chamber.

[0030] A sealing gasket 11 is arranged between the support block and the fixed base plate 9. This enhances the sealing performance of the chamber at the connection between the fixed base plate 9 and the sealing cover 10.

[0031] A sealing ring 12 is arranged between the fixed top plate and the sealing plate. This enhances the sealing performance at the connection between the fixed top plate and the sealing plate.

[0032] Example 3 is a pressure regulating chamber structure with variable impedance orifices. Based on Example 1, in this example, the turntable 6 is provided with two sets of impedance orifices 8. The cross-section of the impedance orifices 8 in the first set of impedance orifices 8 is circular, and the cross-section of the impedance orifices 8 in the second set of impedance orifices 8 is square.

[0033] The size of each impedance hole 8 within the two sets of impedance holes 8 gradually increases or decreases in a clockwise direction. This facilitates the adjustment of the size of the impedance hole 8 located in the water inlet channel 5.

[0034] Example 4 is a voltage regulating chamber structure with a variable impedance orifice. In this example, it has:

[0035] Pressure regulating chamber 1 is installed on the pressure pipeline, and pressure regulating chamber 1 is connected to the pressure pipeline through water inlet channel 5;

[0036] The regulating mechanism is installed on the pressure regulating chamber body 1 and has a chamber installed on the pressure regulating chamber body 1. A turntable 6 is installed in the chamber. The turntable 6 extends into the pressure regulating chamber body 1 and can block the water inlet channel 5. At least two impedance holes 8 with different diameters and smaller than the water inlet channel 5 are formed on the turntable 6 in the circumferential direction at the position corresponding to the water inlet channel 5. A drive mechanism that can drive the turntable 6 to rotate is installed on the chamber.

[0037] The drive mechanism has a drive motor 7 mounted on the chamber, and a rotating shaft is mounted on the output shaft of the drive motor 7. The rotating shaft extends into the chamber and is connected to the turntable 6.

[0038] The chamber consists of a fixed base plate 9, a fixed top plate, and a sealing cover 10. The fixed base plate 9 and the fixed top plate are fixedly installed on the pressure regulating chamber body 1. The turntable 6 is arranged between the fixed base plate 9 and the fixed top plate. The sealing cover 10 is installed on the fixed base plate 9 by bolts 13. The fixed top plate and the sealing cover 10 are respectively provided with a first mating groove and a second mating groove at corresponding positions. When the sealing cover 10 is installed on the fixed base plate 9, the first mating groove and the second mating groove are combined to form a mating hole that mates with the shaft hole.

[0039] The sealing cover 10 is semi-circular, and the bolt 13 is installed at the edge of the sealing cover 10 along the circumferential direction. A support block that can cooperate with the top surface of the fixed base plate 9 is installed at the lower end of the sealing cover 10, and a stop block that can cooperate with the side of the fixed base plate 9 is installed on the support block.

[0040] A sealing gasket 11 is arranged between the support block and the fixed base plate 9.

[0041] A sealing ring 12 is arranged between the fixed top plate and the sealing plate.

[0042] The turntable 6 is provided with two sets of impedance holes 8. The impedance holes 8 of the first set of impedance holes 8 have a circular cross-section, and the impedance holes 8 of the second set of impedance holes 8 have a square cross-section.

[0043] The size of each impedance hole 8 in the two sets of impedance holes 8 gradually increases or decreases in a clockwise direction.

[0044] Example 5 is an embodiment based on Example 4. In this embodiment, there is an upper horizontal water inlet tunnel 2 and a vertical water inlet shaft 3, connected by a bend pipe 4. The pressure regulating chamber structure is installed vertically on the bend pipe 4. This facilitates adjustment of the pressure regulating chamber at the right-angle bend of the pressure pipeline, resulting in better stability.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure regulating chamber structure with a variable impedance orifice, characterized in that: have: The pressure regulating chamber (1) is installed on the pressure pipeline, and the pressure regulating chamber (1) is connected to the pressure pipeline through the water inlet channel (5); The regulating mechanism is installed on the pressure regulating chamber body (1) and has a chamber installed on the pressure regulating chamber body (1). A turntable (6) is installed in the chamber. The turntable (6) extends into the pressure regulating chamber body (1) and can block the water inlet channel (5). At least two impedance holes (8) with different diameters and smaller than the water inlet channel (5) are made on the turntable (6) in the circumferential direction of the turntable (6) at the position corresponding to the water inlet channel (5). A drive mechanism that can drive the turntable (6) to rotate is installed on the chamber.

2. The voltage regulating chamber structure with a variable impedance orifice according to claim 1, characterized in that: The drive mechanism has a drive motor (7) mounted on the chamber, and a rotating shaft is mounted on the output shaft of the drive motor (7), which extends into the chamber and is connected to the turntable (6).

3. The voltage regulating chamber structure with a variable impedance orifice according to claim 2, characterized in that: The chamber consists of a fixed base plate (9), a fixed top plate, and a sealing cover (10). The fixed base plate (9) and the fixed top plate are fixedly installed on the pressure regulating chamber body (1). The turntable (6) is arranged between the fixed base plate (9) and the fixed top plate. The sealing cover (10) is installed on the fixed base plate (9) by bolts (13). The fixed top plate and the sealing cover (10) are respectively provided with a first mating groove and a second mating groove at corresponding positions. When the sealing cover (10) is installed on the fixed base plate (9), the first mating groove and the second mating groove are combined to form a mating hole that mates with the shaft hole.

4. The voltage regulating chamber structure with a variable impedance orifice according to claim 3, characterized in that: The sealing cover (10) is semi-circular, and the bolt (13) is installed at the edge of the sealing cover (10) along the circumferential direction. A support block that can cooperate with the top surface of the fixed base plate (9) is installed at the lower end of the sealing cover (10), and a stop block that can cooperate with the side of the fixed base plate (9) is installed on the support block.

5. A voltage regulating chamber structure with a variable impedance orifice according to claim 4, characterized in that: A sealing gasket (11) is arranged between the support block and the fixed base plate (9).

6. A voltage regulating chamber structure with a variable impedance orifice according to claim 3, characterized in that: A sealing ring (12) is arranged between the fixed top plate and the sealing plate.

7. The voltage regulating chamber structure with a variable impedance orifice according to claim 1, characterized in that: The turntable (6) is provided with two sets of impedance holes (8). The impedance holes (8) of the first set of impedance holes (8) have a circular cross-section, and the impedance holes (8) of the second set of impedance holes (8) have a square cross-section.

8. A voltage regulating chamber structure with a variable impedance orifice according to claim 7, characterized in that: The size of each impedance hole (8) in the two sets of impedance holes (8) gradually increases or decreases in the clockwise direction.

9. A pressure pipeline structure, employing the pressure regulating chamber structure with a variable impedance orifice as described in any one of claims 1 to 8, characterized in that: It has an upper water intake tunnel (2) and a water intake shaft (3), and the upper water intake tunnel (2) and the water intake shaft (3) are connected by a bend pipe (4). The pressure regulating chamber structure is installed on the bend pipe (4) in the vertical direction.

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