Telescopic flow guide pier

Abstract

The invention discloses a telescopic flow guide pier which comprises a water pressure driving mechanism, a transmission mechanism, a flow guide part and a reset mechanism. The water pressure driving mechanism generates rotary displacement under the action of water pressure difference, the displacement is converted into linear displacement of the flow guide part through the transmission mechanism, and the reset mechanism provides restoring force opposite to the extending direction of the flow guide part; the flow guide pier is integrally integrated in an inner cavity of the tail of the gate pier, the transmission mechanism is driven through pressure generated by the water level difference of the two sides, and automatic telescopic adjustment of the flow guide part is achieved. When the water level difference is increased, the transmission mechanism drives the diversion part to extend out of the gate pier; when the water level difference is reduced, the reset mechanism enables the flow guide part to retract into the gate pier; the defect that a fixed flow guide structure is difficult to adapt to different working conditions is overcome, the device can automatically adjust the working conditions according to actual conditions, and the water flow control effect and operation efficiency of an aqueduct outlet are improved; and self-adaptive adjustment is achieved completely through a mechanical structure, external power or manual intervention is not needed, and the device has the advantages of being compact in structure, sensitive in response, high in reliability and the like.

Description

Technical Field

[0001] The present invention relates to a flow guide pier, and particularly to a telescopic flow guide pier. Background Art

[0002] As an important water conveyance structure in water conservancy projects, aqueducts play a key role in fields such as agricultural irrigation, inter-basin water transfer, urban water supply, and hydropower generation. However, problems such as water flow disorder or water level fluctuation often occur at the outlet of the aqueduct, which not only reduces the water conveyance efficiency, causes unnecessary energy loss, but may also trigger scouring, siltation, and even structural damage to the downstream channel. In severe cases, it may lead to water supply interruption or project damage. In the prior art, fixed flow guide piers or stilling basins and other structures are mostly used. Although they can improve the flow pattern to a certain extent, due to their fixed structures, they cannot be dynamically adjusted according to actual flow rates and water level changes. Under low flow conditions, fixed flow guide structures may cause excessive flow resistance or ineffective flow guidance; while at high flow rates, there may be insufficient energy dissipation, making it difficult to meet the operation requirements under different working conditions. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a telescopic flow guide pier that can be dynamically adjusted according to actual working conditions and adapt to different flow rates and water level conditions.

[0004] Technical Solution: The telescopic flow guide pier described in the present invention is integrally integrated into the inner cavity at the tail of the gate pier at the outlet of the aqueduct; it includes a water pressure driving mechanism that rotates around an axis according to the water pressure difference on both sides of the gate pier, a transmission mechanism, a flow guiding member, and a reset mechanism; the water pressure driving mechanism generates a rotational displacement under the action of the water pressure difference on both sides, and this rotational displacement is converted into a linear displacement of the flow guiding member through the transmission mechanism. The reset mechanism is fixedly connected to the flow guiding member and provides a restoring force in the direction opposite to the extending direction thereof.

[0005] Preferably, the water pressure driving mechanism is arranged in the first chamber, and water inlets communicating with the water flows on both sides of the gate pier are provided on both sides of the first chamber. The rotating shaft of the water pressure driving mechanism is an eccentric rotating shaft. The water-facing surface of the water pressure driving mechanism is respectively communicated with the water passing channels on both sides of the gate pier through the first chamber; when the water level difference on both sides exceeds the set threshold, the water pressure driving mechanism deflects around the axis under the action of the pressure difference, and its deflection direction causes the water passing cross-section on the low-pressure side to shrink to form a pressurized area.

[0006] Preferably, the transmission mechanism includes a push plate for receiving water pressure thrust, a slide rail, a boosting structure, and a connecting rod. The slide rail is longitudinally arranged inside the gate pier; the push plate is subjected to the pressure of the water boosted through the first chamber, and drives the connecting rod to convert the angular displacement of the water pressure driving mechanism into a linear motion along the slide rail.

[0007] Preferably, the head of the flow guiding member is of a streamlined structure, and its tail is fixedly connected to the transmission mechanism.

[0008] Preferably, the reset mechanism is a pre-tensioned helical spring, the stiffness coefficient of which is designed according to the maximum water level difference. One end is fixed in the inner cavity at the tail of the pier, and the other end is fixedly connected to the flow guiding member. The telescopic direction is parallel to the movement direction of the flow guiding member.

[0009] Preferably, a drag reduction coating is provided on the surface of the flow guiding member.

[0010] Preferably, a damping structure is provided at the rotating shaft of the water pressure driving mechanism to suppress the oscillation of the mechanism.

[0011] Preferably, a filter screen for blocking sundries from entering the inner part of the chamber is provided at the water inlet of the first chamber.

[0012] Preferably, a self-lubricating coating is provided on the surface of the slide rail, and the contact surface between the connecting rod and the slide rail is a friction-reducing material layer.

[0013] Preferably, a mechanical locking mechanism linked to the flow guiding member is further included. When it is detected that the water level difference exceeds a preset threshold, the locking mechanism can fix the extended position of the flow guiding member.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following remarkable advantages: The telescopic flow guiding pier is integrally integrated into the inner cavity at the tail of the pier, and the transmission mechanism is driven by the pressure generated by the water level difference on both sides, realizing the automatic telescopic adjustment of the flow guiding member. When the water level difference increases, the transmission mechanism drives the flow guiding member to extend out of the pier, effectively improving the water flow pattern; when the water level difference decreases, the reset mechanism makes the flow guiding member automatically retract into the inner cavity of the pier, avoiding ineffective flow guiding. This dynamic adjustment mechanism overcomes the defect that the traditional fixed flow guiding structure is difficult to adapt to different working conditions, enabling the device to automatically adjust the working state according to the actual flow rate and water level conditions, significantly improving the water flow control effect and operation efficiency at the outlet of the aqueduct. The device realizes self-adaptive adjustment completely relying on the mechanical structure, without external power or manual intervention, and has the characteristics of compact structure, sensitive response, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the extended state of the telescopic flow guiding pier of the present invention.

[0017] Figure 3 It is a schematic diagram of the retracted state of the telescopic flow guiding pier of the present invention.

[0018] Figure 4 It is a schematic diagram of the assisting principle of the assisting structure of the present invention.

[0019] Figure 5 It is a schematic diagram of the assisting principle of the assisting structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] As Figures 1-5 shown, a telescopic flow guide pier in this embodiment, compared with a self-integrated fixed flow guide pier or a stilling basin and other structures, the whole device is integrated into the inner cavity at the tail of the sluice pier at the outlet of the aqueduct, and its structural design fully combines the principles of fluid mechanics and mechanical transmission characteristics. The core of the device is composed of a water pressure driving mechanism 1, a transmission mechanism, a flow guide member 2, and a reset mechanism 3. Each component realizes the dynamic adjustment function through a compact layout; the water pressure driving mechanism 1 is arranged in the first chamber 4 of the pier inner cavity, and both sides of this chamber are connected to the external water flow of the pier through the water inlet. The rotating shaft of the water pressure driving mechanism 1 is an eccentric rotating shaft, which can rotate around the axis according to the water pressure difference on both sides of the pier. After its rotation, the water flow outlet areas on both sides change accordingly, and thus the water pressures on both sides will also increase correspondingly; this part of the pressurized water flow impacts the transmission mechanism, pushing the transmission mechanism to move in the direction of the water flow, driving the flow guide member 2 fixedly connected thereto to move accordingly, that is, converting the rotational displacement of the water pressure driving mechanism 1 into the linear displacement of the flow guide member 2 through the transmission mechanism. The flow guide member 2 extends out of the pier to play a role in guiding the flow and improving the water flow state at the outlet of the aqueduct. When the water pressure difference on both sides decreases or even when the water flows smoothly on both sides without a pressure difference, the restoring force provided by the reset mechanism 3 in the opposite direction to the extending direction of the flow guide member 2 is greater than the water flow thrust, driving the flow guide member 2 to contract into the pier to avoid ineffective flow guiding.

[0022] The transmission mechanism includes a push plate 5 for receiving the water pressure thrust, a slide rail 6, a boosting structure 7, and a connecting rod 8. The slide rail 6 is fixedly arranged longitudinally in the pier inner cavity. The push plate 5 is fixedly connected to the flow guide member 2 through the connecting rod 8, and a boosting structure 7 is arranged between the push plate 5 and the connecting rod 8 to form a lever amplification effect. The flow guide member 2 is slidably arranged at the front end of the slide rail 6 and is rigidly connected to the tail of the connecting rod 8. Its head is designed as a streamlined structure, and a drag reduction coating is applied to the surface to reduce the water flow resistance. The reset mechanism 3 adopts a pre-tightened helical spring, with one end fixed on the fixed plate in the pier inner cavity and the other end connected to the tail of the flow guide member 2. The spring expansion and contraction direction is parallel to the movement direction of the flow guide member 2.

[0023] The working principle of the device is based on the dynamic response of the water level difference on both sides of the pier. When the flow rate at the outlet of the aqueduct increases, resulting in a significant water level difference on both sides of the pier, the water flow on the high-pressure side enters the first chamber 4 through the water inlet, pushing the water pressure driving mechanism 1 to rotate around the eccentric shaft. Due to the eccentric setting of the rotating shaft, the water pressure driving mechanism 1 forms an inclination angle during rotation, reducing the cross-sectional area of the water flow channel on the low-pressure side and further amplifying the effect of the pressure difference. The water flow with amplified pressure pushes the push plate 5 along the slide rail 6 to push the flow guide member 2 out of the pier. The surface of the slide rail 6 is coated with a self-lubricating coating, and the contact surface between the connecting rod 8 and the slide rail 6 uses a friction-reducing material layer to ensure low resistance and high sensitivity during the transmission process. After the flow guide member 2 extends out, its streamlined head can effectively guide the water flow, suppress the Karman vortex street phenomenon, and improve the outlet flow pattern.

[0024] When the water level difference decreases or returns to normal, the pressure on the water pressure driving mechanism 1 tends to balance. Under the pulling force of the return spring, the push plate 5 slides reversely along the slide rail 6, driving the flow guide member 2 to retract into the inner cavity of the pier, avoiding ineffective diversion under low-flow conditions. To enhance stability, a damping structure is provided at the rotating shaft of the water pressure driving mechanism 1 to suppress the oscillation of the mechanism caused by water flow pulsation. In addition, a filter screen is installed at the water inlet of the first chamber 4 to prevent debris from entering the chamber and affecting the movement of the driving wing plate. For extreme water level difference conditions, the device is also equipped with a mechanical locking mechanism. When the flow guide member 2 extends to the preset position, the locking mechanism automatically engages and fixes the flow guide member to prevent accidental retraction.

[0025] Through the above implementation manner, the present invention realizes the adaptive adjustment of the flow guide member 2 through a pure mechanical structure without external energy or manual intervention. All components of the device are integrated in the inner cavity of the pier, with a concealed structure and no impact on the overall appearance of the aqueduct. Its dynamic response characteristics can cover different flow rates and water level conditions, and it has significant advantages in improving the water flow pattern and reducing hydraulic losses.

Claims

1. A telescopic guide pier, characterized in that: The device is integrated as a whole into the inner cavity at the tail end of the gate pier at the aqueduct outlet; it comprises a hydraulic drive mechanism (1) that rotates around an axis according to the water pressure difference on both sides of the gate pier, a transmission mechanism, a flow guide (2) and a reset mechanism (3); the hydraulic drive mechanism (1) generates a rotational displacement under the action of the water pressure difference on both sides, and the rotational displacement is converted into a linear displacement of the flow guide (2) through the transmission mechanism; the reset mechanism (3) is fixedly connected to the flow guide (2) and provides a restoring force in the opposite direction of its extension.

2. The guide pier according to claim 1, characterized in that: The hydraulic drive mechanism (1) is arranged in the first chamber (4); water inlets are provided on both sides of the first chamber (4) and are connected to the water flow on both sides of the gate pier; the rotating shaft of the hydraulic drive mechanism (1) is an eccentric rotating shaft.

3. The guide pier according to claim 1, characterized in that: The transmission mechanism comprises a push plate (5) for receiving water pressure thrust, a slide rail (6), a power-assisting structure (7) and a connecting rod (8), wherein the slide rail (6) is longitudinally arranged inside the gate pier.

4. The guide pier according to claim 1, characterized in that: The head of the flow guide (2) is a streamlined structure, and the tail is fixedly connected to the transmission mechanism.

5. The guide pier according to claim 1, characterized in that: The reset mechanism (3) is a pre-tightened coil spring, one end of which is fixed in the inner cavity of the tail of the gate pier and the other end is fixedly connected to the guide member (2), and the expansion and contraction direction of the spring is parallel to the movement direction of the guide member (2).

6. The guide pier according to claim 1, characterized in that: The surface of the flow guide (2) is provided with a drag-reducing coating.

7. The guide pier according to claim 1, characterized in that: A damping structure for suppressing oscillation of the mechanism is provided at the rotating shaft of the water pressure drive mechanism (1).

8. The guide pier according to claim 2, characterized in that: A filter screen is provided at the water inlet of the first chamber (4) for preventing debris from entering the chamber.

9. The guide pier according to claim 3, characterized in that: The surface of the slide rail (6) is provided with a self-lubricating coating, and the contact surface between the connecting rod (8) and the slide rail (6) is a friction-reducing material layer.

10. The guide pier according to claim 1, characterized in that: It also comprises a mechanical locking mechanism which is linked with the flow guide member (2) and is used to fix the extended position of the flow guide member.

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