A reverse sliding block device for tailrace emergency gate of pumped storage power station

Abstract

This invention discloses a reverse slider device for a tailrace emergency gate of a pumped storage power station, comprising: an end cover, a non-fully enclosed frame structure, welded and fixed to the reverse slider seat plate of the tailrace emergency gate, with an assembly opening on one side; a base plate, inserted into the end cover assembly opening, with a countersunk hole machined on the top; a disc spring, embedded in the countersunk hole on the top of the base plate; a retaining plate, placed above the disc spring, with a boss at the bottom that mates with the countersunk hole in the base plate; a reverse slider, fitted to the top of the retaining plate; and a side cover, installed at the end cover assembly opening, vertically limited by a pre-set groove on the end cover, and connected to the end cover with fasteners, enclosing the base plate, disc spring, and retaining plate within the end cover. This invention, through its modular assembly structure and reliable enclosed design, achieves convenient installation and maintenance as well as long-term stable operation, and is suitable for the high-load conditions of the tailrace emergency gate of a pumped storage power station.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, specifically to a reverse sliding block device for a tailrace emergency gate of a pumped storage power station. Background Technology

[0002] In pumped-storage power stations with long tailrace systems, a tailrace emergency gate is typically installed at an appropriate location on the unit's tailrace branch pipe. This gate can promptly cut off the water flow in case of an accident or a ruptured water supply pipeline, preventing the accident from escalating. It also serves to block incoming water from the reservoir during unit maintenance. Conventional reverse sliding block devices use a bolted connection to the gate and reverse sliding block seat plate via drilled holes, which can lead to leakage at the bolt holes. Furthermore, the tailrace emergency gate of a pumped-storage power station is affected by bidirectional water flow; therefore, the gate design must not only meet basic strength and stiffness requirements but also ensure vibration resistance. Conventional sliding blocks have limited damping effect and cannot adequately counteract the gate resonance caused by bidirectional water flow, making it difficult to meet actual vibration design requirements.

[0003] During operation, the tailrace emergency gate of a pumped storage power station must withstand the reverse water thrust. Traditional reverse sliding block devices suffer from problems such as difficult installation and maintenance, poor sealing, and insufficient elasticity. Existing devices mostly adopt an integral closed structure, requiring the assembly of internal components by disassembling the entire unit, resulting in low on-site maintenance efficiency. The sealing structure often relies on simple rubber gaskets, which are susceptible to water erosion and have poor elastic stability, making them unsuitable for high-load impact conditions and requiring frequent replacement, thus affecting the operating efficiency of the power station. Summary of the Invention

[0004] The purpose of this invention is to provide a reverse sliding block device for tailrace emergency gates of pumped storage power stations that is easy to install and maintain, has reliable sealing, and has a strong load-bearing capacity, in order to solve the problems of difficult installation, poor sealing, and easy failure of elastic elements in traditional devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a reverse sliding block device for a tailrace emergency gate of a pumped storage power station, comprising: End cap, which is a non-fully enclosed frame structure, is fixed to the reverse slider seat plate of the tailrace emergency gate by welding, and an assembly opening is left on one side of the end cap. The base plate is inserted into the end cover through the assembly opening of the end cover, and a mounting countersunk hole is machined on its top. A disc spring, wherein the disc spring is fitted into a mounting countersunk hole at the top of the base plate; A card plate, which is placed above a disc spring, has a boss at the bottom that mates with a countersunk hole at the top of the base plate; A reverse slider is fitted onto the top of the card plate, and the cross-section of the reverse slider is inverted T-shaped. The side cover is installed at the assembly opening of the end cover. The side cover is vertically limited by the pre-set slot of the end cover and is connected to the end cover by fasteners. The bottom plate, disc spring, card plate and T-shaped horizontal plate of the reverse slider are enclosed in the end cover. The T-shaped vertical protrusion of the reverse slider protrudes out of the through groove formed by the top surface of the end cover and the side cover. In the absence of external force, the disc spring is almost in a free state. Under pressure, the T-shaped vertical protrusion of the reverse slider is squeezed to make the reverse slider press against the plate, which drives the circular boss to move up and down along the circular hole at the top of the base plate to compress the disc spring.

[0006] Furthermore, the end cap has a U-shaped frame structure, and bolt holes for installing the side cap are provided on its side wall.

[0007] Furthermore, the base plate is made of Q355B material, and the assembly gap between the base plate and the disc spring is no more than 0.5mm.

[0008] Furthermore, the card plate is made of Q355B material, and a reverse slider is attached to the top of the card plate.

[0009] Furthermore, the side cover has a plate-like structure with a flange on one side. The flange is embedded in a groove in the side wall of the end cover to achieve guidance and positioning.

[0010] Furthermore, the side cover is connected to the side wall of the end cover by bolts, the bolts passing through through holes on the side cover and bolt holes on the side wall of the end cover.

[0011] Furthermore, the reverse slider is made of a high-strength alloy material.

[0012] Furthermore, there are multiple disc springs, which are stacked and installed in the countersunk holes of the base plate.

[0013] Furthermore, the welding of the end cover and the reverse slider seat plate of the tailrace emergency gate adopts a continuous weld, and the weld leg height is not less than 8mm.

[0014] Furthermore, the T-shaped vertical protrusion of the reverse slider has chamfered ends.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Modular assembly and reliable sealing: The end cap adopts a non-fully enclosed frame structure with reserved assembly openings. Combined with the detachable side caps, internal components can be easily installed through the side openings without the need to completely disassemble the end caps, greatly simplifying the on-site installation and maintenance process. The side caps achieve precise vertical positioning through the pre-set slots on the end caps and are then horizontally locked with fasteners to form a stable and sealed structure, effectively preventing the intrusion of external mud and water, and ensuring the long-term stable operation of the internal spring and slider components.

[0016] 2. Compact structure and strong load-bearing capacity: The components are assembled in layers (base plate-spring-clamping plate-slider), making full use of the internal space of the end cover. The overall structure is compact and adaptable to the narrow installation space of the tailrace emergency gate of the pumped storage power station. The "U"-shaped end cover frame structure provides sufficient side wall strength to withstand the reverse water thrust of the gate transmitted by the reverse slider and avoid deformation. Continuous weld (weld leg height ≥ 8mm) ensures the connection strength between the end cover and the seat plate and can withstand the concentrated load transmitted by the reverse slider.

[0017] 3. Elastic stability: The assembly gap of ≤0.5mm effectively limits the radial displacement of the disc spring, prevents the spring from skewing or jamming, and ensures the stability of its axial elastic deformation; the stacking of multiple disc springs can provide greater elastic force to meet the requirements of the reverse slider to withstand the reverse water thrust when the gate is closed. The stacked structure has stable elastic characteristics during compression, which can effectively buffer the impact force when the gate is opened and closed and extend its service life.

[0018] 4. Reliable connection and convenient assembly: The clearance fit between the boss and the countersunk hole provides radial guidance for the clamping plate, allowing it to maintain axial movement during the compression / reset of the disc spring and avoid jamming; the reverse slider fits against the top of the clamping plate to evenly transfer the load; the fit between the flange and the slot provides precise vertical positioning for the side cover, and the bolt connection facilitates quick disassembly of the side cover, providing convenience for the inspection or replacement of internal components. Attached Figure Description

[0019] Figure 1 This is a perspective view of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0020] Figure 2 This is a cross-sectional view of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0021] Figure 3 This is a perspective view of the end cover of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0022] Figure 4 This is a perspective view of the base plate of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0023] Figure 5 This is a perspective view of the butterfly spring in the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0024] Figure 6 This is a perspective view of the plate of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0025] Figure 7 This is a perspective view of the reverse slider of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0026] Figure 8 This is a perspective view of the side cover of the reverse slider device for the tailrace emergency gate of the pumped storage power station according to the present invention.

[0027] In the figure, 1—end cover, 2—base plate, 3—butterfly spring, 4—clamping plate, 5—reverse slider, 6—side cover, 7—tailraceway emergency gate reverse slider seat plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "middle", "lower", "inner", "outer", "both sides", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this invention and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Please see Figures 1 to 8 The present invention provides a reverse slider device for a tailrace emergency gate of a pumped storage power station, comprising an end cover 1, a base plate 2, a disc spring 3, a clamping plate 4, a reverse slider 5, and a side cover 6.

[0032] End cover 1 is a non-fully enclosed frame structure, which is fixed to the reverse slider seat plate 7 of the tailrace emergency gate by welding, and an assembly opening is left on one side of end cover 1; end cover 1 has a U-shaped frame structure, and bolt holes for installing side cover 6 are opened on its side wall; the welding of end cover 1 and the reverse slider seat plate 7 of the tailrace emergency gate adopts a continuous weld, and the weld leg height is not less than 8mm.

[0033] The base plate 2 is inserted into the end cover 1 through the assembly opening of the end cover 1, and a countersunk hole is machined on its top; the material of the base plate 2 is Q355B, and the assembly gap between the base plate 2 and the disc spring 3 is no more than 0.5mm.

[0034] The disc spring 3 is embedded in the mounting countersunk hole at the top of the base plate 2; there are multiple disc springs 3, which are stacked and installed in the countersunk hole of the base plate 2.

[0035] The clamping plate 4 is placed above the disc spring 3. The bottom of the clamping plate 4 is machined with a boss that matches the countersunk hole at the top of the base plate 2. The material of the clamping plate 4 is Q355B. The clamping plate 4 is fitted with the countersunk hole at the top of the base plate 2 through the boss at its bottom.

[0036] The reverse slider 5 is fitted onto the top of the card plate 4, and the cross-section of the reverse slider 5 is inverted T-shaped; the reverse slider 5 is made of high-strength alloy material.

[0037] The side cover 6 is installed at the assembly opening of the end cover 1. The side cover 6 is vertically limited by the pre-set slot of the end cover 1 and is connected to the end cover 1 by fasteners, enclosing the T-shaped horizontal plate of the base plate 2, disc spring 3, retaining plate 4 and reverse slider 5 inside the end cover 1. The side cover 6 is a plate structure with a flange on one side. The flange is embedded in the slot of the side wall of the end cover 1 to achieve guidance and limitation. The side cover 6 is connected to the side wall of the end cover 1 by bolts. The bolts pass through the through holes on the side cover 6 and the side wall of the end cover 1.

[0038] In the absence of external force, the disc spring 3 is just close to being in a free state. Under pressure, the T-shaped vertical protrusion of the reverse slider 5 is squeezed to make the reverse slider 5 press against the clamping plate 4, which drives the circular boss to move up and down along the circular hole at the top of the base plate 2 to compress the disc spring 3.

[0039] End cap 1 adopts a non-fully enclosed frame structure with reserved assembly openings. Together with the detachable side cap 6, internal components such as base plate 2, disc spring 3, and clamping plate 4 can be easily installed through the side openings without the need to completely disassemble end cap 1, greatly simplifying the on-site installation and maintenance process. The side cap 6 achieves precise vertical positioning through the grooves on the inner wall of end cap 1, and is then horizontally locked with fasteners to form a stable and closed structure, effectively preventing the intrusion of external mud and water flow, and ensuring the long-term stable operation of the internal spring and slider components. The components are assembled in layers (base plate 2-spring 3-clamping plate 4-slider 5), making full use of the internal space of end cap 1. The overall structure is compact and suitable for the narrow installation space of the tailrace emergency gate of a pumped storage power station.

[0040] The U-shaped frame structure provides sufficient sidewall strength to withstand the reverse water thrust transmitted by the reverse slider 5, preventing deformation; the bolt holes on the sidewalls correspond precisely to the through holes of the side cover 6, enabling quick bolt connection of the side cover 6 and improving assembly efficiency.

[0041] Q355B steel has good strength and toughness, and can withstand the preload of disc spring 3 and the reaction force of reverse slider 5; the assembly gap of ≤0.5mm effectively limits the radial displacement of disc spring 3, prevents spring from deflection or jamming, ensures the stability of its axial elastic deformation, and extends service life.

[0042] The clearance fit between the boss and the countersunk hole provides radial guidance for the clamping plate 4, allowing it to maintain axial movement during the compression / reset of the disc spring 3 and avoid jamming; multiple countersunk holes enable multi-point fastening connection between the reverse slider 5 and the clamping plate 4, evenly transmitting the load and preventing the slider 5 from loosening or falling off.

[0043] The fit between the flange and the slot provides precise vertical positioning for the side cover 6, ensuring its assembly accuracy with the end cover 1 and preventing incomplete sealing due to misalignment. The flange slides within the slot, providing guidance during the installation of the side cover 6, reducing assembly difficulty and improving installation efficiency.

[0044] The T-shaped vertical protrusion of the reverse slider has chamfered ends.

[0045] The bolted connection provides a reliable horizontal locking force, preventing the side cover 6 from loosening or falling off under the impact of water flow or the vibration of the gate; the bolted connection method facilitates the quick disassembly of the side cover 6, providing convenience for the maintenance or replacement of internal components.

[0046] The stacked disc springs 3 provide greater elastic force to meet the requirements of the reverse slider 5 to withstand the reverse water thrust when the gate is closed; the stacked structure has stable elastic characteristics during compression, which can effectively buffer the impact force when the gate is opened and closed, and ensure the smooth operation of the slider device.

[0047] The continuous weld provides full-circumference connection strength, ensuring a firm weld between the end cap 1 and the base plate 7, and can withstand the concentrated load transmitted by the reverse slider 5; the weld leg height of ≥8mm meets the welding strength requirements of water conservancy and hydropower projects, prevents weld cracking, and ensures the safety and reliability of the device in long-term operation.

[0048] The working principle of this invention is as follows: The end cover 1 is fixed to the reverse slider seat plate 7 of the tailrace emergency gate by welding to form an external support frame; the base plate 2 is inserted into the end cover 1 through the assembly opening, and the disc spring 3 is embedded in the countersunk hole at the top of the base plate 2 to provide elastic preload; the clamping plate 4 is placed above the disc spring 3, and its bottom boss is fitted with the countersunk hole of the base plate 2 to achieve radial guidance and axial elastic support; the reverse slider 5 is attached to the top of the clamping plate 4; the side cover 6 is vertically limited by embedding the flange into the side wall groove of the end cover 1, and then connected to the side wall of the end cover 1 with bolts to enclose the internal components inside the end cover 1.

[0049] When the tailrace emergency gate is closed, the reverse slider 5 bears the reverse water thrust. This force is transmitted to the disc spring 3 through the clamping plate 4. The spring 3 is compressed and deformed to absorb the impact energy, and at the same time, it is transmitted to the end cover 1 through the base plate 2. Finally, it is borne by the welded structure between the end cover 1 and the seat plate 7. When the gate is opened, the disc spring 3 resets, pushing the clamping plate 4 and the reverse slider 5 back to their original positions. The closed structure of the side cover 6 prevents external mud and water from entering, ensuring the long-term stable operation of the internal spring and slider assembly.

[0050] The reverse sliding block device for the tailrace emergency gate of a pumped storage power station of the present invention is used as follows: 1. Weld the end cap to the top of the reverse slider seat plate of the tailrace emergency gate; 2. Place the base plate on top of the end cap.

[0051] 3. Place a butterfly spring in the hole at the top of the base plate.

[0052] 4. The card plate is placed above the disc spring.

[0053] 5. The reverse slider is placed above the card plate.

[0054] 6. The side cover is installed at the reserved installation entrance of the end cover along the direction of the end cover groove, and is connected to the end cover by fasteners, bolts, nuts, and washers.

[0055] This invention abandons the traditional reverse slider device, making full use of the outstanding shock absorption capacity of the disc spring, its ability to withstand large loads with small deformations, and its excellent spatial adaptability. It can maximize the offsetting of the resonance effect on the tailrace emergency gate under the action of bidirectional water flow, and greatly improve the gate's vibration resistance and stability. At the same time, the combination of end cover and side cover forms a unique closed protective structure, which not only completely eliminates the risk of water leakage at the bolt hole of the reverse slider, but also effectively avoids the operational risk of disc spring detachment. It comprehensively ensures the structural reliability and operational safety of the entire device, providing a benchmark solution for the reverse slider of the tailrace emergency gate of pumped storage power station.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reverse sliding block device for a tailrace emergency gate in a pumped storage power station, characterized in that, include: End cap (1), the end cap (1) is a non-fully enclosed frame structure, which is fixed to the reverse slider seat plate (7) of the tailrace accident gate by welding, and an assembly opening is left on one side of the end cap (1). The base plate (2) is inserted into the end cover (1) through the assembly opening of the end cover (1), and a mounting countersunk hole is machined on its top. Disc spring (3), the disc spring (3) is embedded in the mounting countersunk hole at the top of the base plate (2); The card plate (4) is placed above the disc spring (3), and the bottom of the card plate (4) is machined with a boss that matches the countersunk hole at the top of the base plate (2); The reverse slider (5) is fitted onto the top of the card plate (4), and the cross section of the reverse slider (5) is inverted T-shaped. Side cover (6), the side cover (6) is installed at the assembly opening of the end cover (1). The side cover (6) is vertically limited by the pre-set slot of the end cover (1) and connected to the end cover (1) by fasteners. The T-shaped horizontal plate of the base plate (2), disc spring (3), card plate (4) and reverse slider (5) is closed in the end cover (1). The T-shaped vertical protrusion of the reverse slider (5) protrudes out of the through groove formed by the top surface of the end cover (1) and the side cover (6). In the absence of external force, the disc spring (3) is just close to being in a free state. Under pressure, the T-shaped vertical protrusion of the reverse slider (5) is squeezed to make the reverse slider (5) press against the plate (4), which drives the circular boss to move up and down along the circular hole at the top of the base plate (2) to compress the disc spring (3).

2. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The end cap (1) has a U-shaped frame structure, and bolt holes for installing the side cap (6) are provided on its side wall.

3. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The base plate (2) is made of Q355B material, and the assembly gap between the base plate (2) and the disc spring (3) is no more than 0.5mm.

4. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The material of the card plate (4) is Q355B, and the top of the card plate (4) is fitted with a reverse slider (5).

5. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The side cover (6) is a plate-shaped structure with a flange on one side. The flange is embedded in the slot of the side wall of the end cover (1) to achieve guidance and positioning.

6. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 6, characterized in that, The side cover (6) is connected to the side wall of the end cover (1) by bolts, which pass through the through holes on the side cover (6) and the bolt holes on the side wall of the end cover (1).

7. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The reverse slider (5) is made of high-strength alloy material.

8. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The disc springs (3) are multiple in number and are installed in the countersunk holes of the base plate (2) in a stacked state.

9. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The welding of the end cap (1) and the reverse slider seat plate (7) of the tailrace accident gate adopts a continuous weld, and the weld leg height is not less than 8mm.

10. The reverse sliding block device for the tailrace emergency gate of a pumped storage power station according to claim 1, characterized in that, The T-shaped vertical protrusion of the reverse slider (5) has chamfered ends.

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