Bilateral overflow channel structure for solving overhigh surge of gate shaft of power station

Abstract

The utility model relates to a double-side overflow channel structure for solving the problem of overhigh surge of a gate shaft of a power station. The double-side overflow channel structure comprises an overflow middle channel and an overflow side channel, an inner side opening, close to the reservoir area, of the overflow middle channel faces the reservoir basin, an inner side overflow opening is formed in the upper portion of the inner side, close to the reservoir area, of the gate well hole, and the overflow middle channel communicates with the gate well hole through the inner side overflow opening; the whole overflow side channel is in a U shape or an L shape, an inner side outlet, close to the reservoir area, of a side channel section of the overflow side channel faces the reservoir basin, an outer side overflow opening is formed in the upper portion of the outer side, away from the reservoir area, of the gate well hole, and an end channel section of the overflow side channel is communicated with the gate well hole through the outer side overflow opening. And the bottom elevations of the outer overflow port and the inner overflow port are the same. The double-side overflow channel not only can enable the highest surge to meet the requirement of a control value, but also can save the work amount for arranging a surge chamber, save the cost, can enable surge water flow to return to a reservoir area, and is obvious in ecological effect and economic benefit especially for areas with scarce water resources.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow channels of power station gate wells in pressurized water delivery projects, in particular to a double-side overflow channel structure for solving the problem of excessively high surges in power station gate wells. Background Art

[0002] At present, there are still many key and difficult problems in the construction of pumped storage power stations. The transition process analysis during the power station construction period is one of them, among which the maximum surge is one of the main control values ​​of hydraulic transition calculation.

[0003] Due to topographical factors, when the horizontal tunnel section between the inlet / outlet and the gate well is too long and a surge chamber is not or cannot be installed, the adjustment guarantee calculation process under unfavorable working conditions often finds that the gate well surge is too high.

[0004] The existing single-sided overflow channel can no longer meet the maintenance calculation requirements, and the surge height can only be slightly improved by expanding the gate well section and tunnel diameter. In addition, the solution of raising the hoist maintenance platform not only increases the engineering workload, but also makes the overall layout and the connection between the maintenance platform and the dam top road appear inconsistent due to the elevation difference. Utility Model Content

[0005] In order to solve the above problems, the purpose of the utility model is to provide a double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] As one aspect of the utility model, a double-sided overflow channel structure for solving the problem of excessive surge in a power station gate shaft comprises an overflow middle channel and an overflow side channel; the inner opening of the overflow middle channel close to the reservoir area faces the reservoir basin, an inner overflow port is opened at the inner upper part of the gate shaft hole close to the reservoir area, and the overflow middle channel is connected with the gate shaft hole through the inner overflow port; the overflow side channel is U-shaped as a whole, comprising side channel sections located on both sides of the overflow middle channel and an end channel section located on the outer side of the overflow middle channel away from the reservoir area, the side channel sections on both sides of the overflow side channel are close to the inner outlet of the reservoir area and face the reservoir basin, an outer overflow port is opened at the outer upper part of the gate shaft hole away from the reservoir area, and the end channel section of the overflow side channel is connected with the gate shaft hole through the outer overflow port; the outer overflow port and the inner overflow port have the same bottom elevation.

[0008] Specifically, the bottom slopes of the overflow middle channel and the side channel sections on both sides of the overflow side channel are positive slopes.

[0009] Specifically, the overflow side channel and the overflow middle channel are formed by two side piers on the periphery, side walls at the ends and two middle piers in the middle.

[0010] Specifically, the overflow middle channel and the overflow side channel are connected to the gate well in a curve, a straight line or a broken line.

[0011] Specifically, the cross-sectional shapes of the overflow middle channel and the overflow side channel are rectangular, trapezoidal, circular or irregular.

[0012] As another aspect of the utility model, a double-sided overflow channel structure for solving the problem of excessive surge in a power station gate shaft comprises an overflow middle channel and an overflow side channel; the inner opening of the overflow middle channel close to the reservoir area faces the reservoir basin, an inner overflow port is opened at the inner upper part of the gate shaft hole close to the reservoir area, and the overflow middle channel is connected with the gate shaft hole through the inner overflow port; the overflow side channel is L-shaped as a whole, comprising a side channel section located on one side of the overflow middle channel and an end channel section located on the outer side of the overflow middle channel away from the reservoir area, the side channel section of the overflow side channel is close to the inner outlet of the reservoir area and faces the reservoir basin, an outer overflow port is opened at the outer upper part of the gate shaft hole away from the reservoir area, and the end channel section of the overflow side channel is connected with the gate shaft hole through the outer overflow port; the outer overflow port and the inner overflow port have the same bottom elevation.

[0013] Specifically, the bottom slopes of the side channel sections of the overflow middle channel and the overflow side channel are positive slopes.

[0014] Specifically, the overflow side channel and the overflow middle channel are formed by a side pier located on one side of the periphery, a side wall at the end, and two middle piers located on the other side of the periphery and in the middle.

[0015] Specifically, the overflow middle channel and the overflow side channel are connected to the gate well in a curve, a straight line or a broken line.

[0016] Specifically, the cross-sectional shapes of the overflow middle channel and the overflow side channel are rectangular, trapezoidal, circular or irregular.

[0017] The utility model has the following beneficial effects:

[0018] The utility model adopts U-shaped or L-shaped double-sided overflow channels, which can not only make the highest surge meet the control value requirements, but also save the engineering workload of setting up a pressure regulating chamber, save costs, and allow the surge water flow to return to the reservoir area, especially for areas with scarce water resources, with obvious ecological effects and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of the utility model from the side;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of a double-side overflow channel structure when the overflow side channel of the utility model is U-shaped;

[0021] Figure 3 It is a top view structural schematic diagram of the double-side overflow channel structure diagram when the overflow side channel of the utility model is U-shaped;

[0022] Figure 4It is a front internal structure schematic diagram of the double-sided overflow channel structure when the overflow side channel of the utility model is U-shaped;

[0023] Figure 5 It is a schematic diagram of the top view of the double-sided overflow channel structure when the overflow side channel of the utility model is L-shaped. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] See also Figures 1 to 5 A double-sided overflow channel structure for solving the problem of excessive surge in a power station gate shaft includes an overflow middle channel 1 located in the middle and an overflow side channel 2 located on the side of the overflow middle channel 1.

[0026] The inner outlet of the overflow middle channel 1 near the reservoir area faces the reservoir basin, and the inner overflow port 11 is opened at the inner upper part of the gate well hole 102 near the reservoir area. The outer side of the overflow middle channel 1 away from the reservoir area is connected to the gate well hole 102 of the power station through the inner overflow port 11. The bottom slope of the overflow middle channel 1 is always a positive slope, and the slope can be adjusted according to the discharge flow demand.

[0027] As a specific implementation of the overflow channel 2, see Figures 2 to 4 The overflow channel 2 is U-shaped as a whole, including the side channel sections 21 located on both sides of the overflow channel 1 and the end channel sections 22 located on the outside of the overflow channel 1 away from the reservoir area. The side channel sections 21 on both sides of the overflow channel 2 are close to the inner outlet of the reservoir area and face the reservoir basin. The outer overflow port 23 is opened on the upper part of the outer side of the gate well 102 away from the reservoir area. The end channel section 22 of the overflow channel 2 is connected to the gate well 102 through the outer overflow port 23. The bottom slope of the side channel sections 21 on both sides of the overflow channel 2 is always a positive slope, and the slope can be adjusted according to the discharge flow demand.

[0028] The bottom elevation of the outer overflow port 23 is the same as that of the inner overflow port 11 .

[0029] In this embodiment, the overflow side channel 2 and the overflow middle channel 1 are formed by two peripheral side piers 24, side walls 25 at the ends and two middle piers 12 in the middle.

[0030] The overflow ports on both sides are control sections that affect the height of the surge. When the pump-turbine unit is under unfavorable working conditions, the water in the pressure tunnel 101 instantly surges up the water level of the gate well. After reaching the elevation of the channel bottom, the inner overflow port 11 and the overflow middle channel 1 on the inner side of the reservoir directly discharge the surged water into the reservoir, and the outer overflow port 23 on the other side discharges the surged water through the circular U-shaped overflow side channel 2 and finally into the reservoir, so that the surge water always flows back into the reservoir, realizing the recycling of water resources in the reservoir area.

[0031] As another specific implementation of the overflow channel 2, see Figure 5 The overflow channel 2 is L-shaped as a whole, including a side channel section 21 located on one side of the overflow channel 1 and an end channel section 22 located on the outside of the overflow channel 1 away from the reservoir area. The side channel section 21 of the overflow channel 2 is close to the inner outlet of the reservoir area and faces the reservoir basin. An outer overflow port 23 is opened at the upper outer part of the gate well 102 away from the reservoir area, and the end channel section 22 of the overflow channel 2 is connected to the gate well 102 through the outer overflow port 23. The bottom slope of the side channel section 21 of the overflow channel 2 is always a positive slope, and the slope can be adjusted according to the discharge flow demand.

[0032] The bottom elevation of the outer overflow port 23 is the same as that of the inner overflow port 11 .

[0033] In this embodiment, the overflow side channel 2 and the overflow middle channel 1 are formed by a side pier 24 located on one side of the periphery, a side wall 25 at the end, and two middle piers 12 located on the other side of the periphery and in the middle.

[0034] The overflow channel 2 can be unilateral as long as it meets the discharge flow requirements of the project. The water in the pressure tunnel 101 instantly surges up the water level of the gate well, and after reaching the channel bottom elevation, the excess flow is discharged through the overflow ports on both sides, the overflow middle channel 1 and the L-shaped overflow channel 2.

[0035] In the above two specific embodiments, the connection mode of the overflow middle channel 1 and the overflow side channel 2 with the gate well 102 can be a curve, a straight line or a broken line according to the overflow coefficient or construction requirements. The cross-sectional height, width and cross-sectional shape of the overflow middle channel 1 and the overflow side channel 2 are rectangular, trapezoidal, circular or irregular, which can be determined according to the engineering requirements.

[0036] The above description is only a specific implementation method of the utility model, and does not limit the patent scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station, characterized by: The overflow channel (1) comprises an overflow middle channel (1) and an overflow side channel (2); the inner opening of the overflow middle channel (1) near the reservoir area faces the reservoir basin, an inner overflow opening (11) is provided at the inner upper part of the gate well hole (102) near the reservoir area, and the overflow middle channel (1) is connected to the gate well hole (102) through the inner overflow opening (11); the overflow side channel (2) is U-shaped as a whole, and comprises side channel sections (21) located on both sides of the overflow middle channel (1) and a side channel section (21) located on the overflow middle channel (1). The end channel section (22) is away from the outer side of the reservoir area, and the side channel sections (21) on both sides of the overflow side channel (2) are close to the inner outlet of the reservoir area and face the reservoir basin. An outer overflow port (23) is provided at the upper outer side of the gate well hole (102) away from the reservoir area. The end channel section (22) of the overflow side channel (2) is connected to the gate well hole (102) through the outer overflow port (23); the bottom elevation of the outer overflow port (23) and the inner overflow port (11) are the same.

2. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 1, characterized in that: The bottom slopes of the overflow middle channel (1) and the side channel sections (21) on both sides of the overflow side channel (2) are positive slopes.

3. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 1, characterized in that: The overflow side channel (2) and the overflow middle channel (1) are formed by two peripheral side piers (24), side walls (25) at the ends and two middle piers (12) located in the middle.

4. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 1, characterized in that: The overflow middle channel (1) and the overflow side channel (2) are connected to the gate well (102) in the form of a curve, a straight line or a broken line.

5. The double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 1 is characterized in that: The cross-sectional shapes of the overflow middle channel (1) and the overflow side channel (2) are rectangular, trapezoidal or circular.

6. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station, characterized in that: The invention comprises an overflow middle channel (1) and an overflow side channel (2); the inner opening of the overflow middle channel (1) close to the reservoir area faces the reservoir basin, an inner overflow opening (11) is provided at the inner upper part of the gate well hole (102) close to the reservoir area, and the overflow middle channel (1) is connected to the gate well hole (102) through the inner overflow opening (11); the overflow side channel (2) is L-shaped as a whole, and comprises a side channel section (21) located on one side of the overflow middle channel (1) and a side channel section (22) located on the inner upper part of the overflow middle channel (1). 1) an end channel section (22) away from the outside of the reservoir area, a side channel section (21) of the overflow side channel (2) close to the inner outlet of the reservoir area and facing the reservoir basin, an outer overflow port (23) is provided at the upper part of the outer side of the gate well hole (102) away from the reservoir area, and the end channel section (22) of the overflow side channel (2) is connected to the gate well hole (102) through the outer overflow port (23); the bottom elevation of the outer overflow port (23) and the inner overflow port (11) are the same.

7. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 6, characterized in that: The bottom slopes of the overflow middle channel (1) and the side channel sections (21) of the overflow side channel (2) are positive slopes.

8. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 6, characterized in that: The overflow side channel (2) and the overflow middle channel (1) are formed by a side pier (24) located on one side of the periphery, a side wall (25) at the end, and two middle piers (12) located on the other side of the periphery and in the middle.

9. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 6, characterized in that: The overflow middle channel (1) and the overflow side channel (2) are connected to the gate well (102) in the form of a curve, a straight line or a broken line.

10. A double-sided overflow channel structure for solving the problem of excessive surge in the gate shaft of a power station according to claim 6, characterized in that: The cross-sectional shapes of the overflow middle channel (1) and the overflow side channel (2) are rectangular, trapezoidal or circular.

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