An inverted siphon water conservancy system for preventing sediment blockage

Abstract

An inverted siphon water conservancy system for preventing silt blockage includes an inlet section, a pipe section, and an outlet section. The pipe section is provided with a sand-raising mechanism for raising silt flowing through the water body to prevent it from settling at the bottom of the pipe section. The outlet section is provided with a sand-discharging mechanism for discharging silt introduced through the pipe section to prevent it from settling between the pipe section and the outlet section. The sand-raising mechanism includes a plurality of wedge-shaped blocks spaced apart along the length of the pipe section, with the wedge surfaces of each wedge facing the direction of water flow. The sand-discharging mechanism comprises a housing distributed along the length of the outlet section and a scraper disposed within the housing. The bottom of the housing is provided with a strip hole through which a sand-scraping blade on the scraper extends and engages with a small gap at the bottom of the outlet section. A water wheel is also provided on the roller shaft of the scraper, with the lower edge of the water wheel also extending through the strip hole. The present invention is used to prevent or reduce silt deposition in an inverted siphon.

Description

Technical Field

[0001] The invention relates to the field of water conservancy construction, in particular to an inverted siphon water conservancy system which is resistant to sediment blockage. Background Art

[0002] Inverted siphons are the most common type of river-canal intersection structure in water conservancy projects. For example, the main canal of the South-to-North Water Diversion Project's middle route is designed for gravity water transfer. When passing through a natural river or a building, it needs to pass through the bottom of the natural river or building through an inverted siphon. The main body of the inverted siphon is a U-shaped structure, consisting of an inlet section, a pipe section, and an outlet section. After long-term use, the sediment in the water passing through the inverted siphon easily settles at the bottom of the pipe section, especially at the connection between the pipe section and the outlet section. This results in a reduction in the water handling capacity of the inverted siphon and may even cause blockage, so regular cleaning of the sediment in the inverted siphon is required. However, since the pipe section of an inverted siphon is often long, the sediment cleaning is more difficult. Summary of the Invention

[0003] The present invention aims to provide an inverted siphon water conservancy system which is resistant to silt blockage and which avoids or reduces the deposition of silt in the inverted siphon.

[0004] In order to solve the above technical problems, the present invention adopts a specific solution: an inverted siphon water conservancy system for preventing sediment blockage, comprising an inlet section, a pipe section, and an outlet section. The pipe section is provided with a sand-raising mechanism for raising sediment in the water body to prevent it from settling at the bottom of the pipe section. The outlet section is provided with a sand-discharging mechanism for discharging sediment introduced through the pipe section to prevent it from settling between the pipe section and the outlet section.

[0005] The sand-raising mechanism includes a plurality of wedge-shaped blocks spaced apart along the length of the pipe section, and the wedge surface of any wedge-shaped block is distributed toward the direction of water flow; the sand-discharging mechanism is a box shell distributed along the length of the outlet section and a scraper arranged in the box shell. A strip hole is provided at the bottom of the box shell, and the strip hole is used for the sand-scraping scraper on the scraper to extend and cooperate with the small gap at the bottom of the outlet section. A water wheel is also provided on the roller shaft of the scraper, and the lower edge of the water wheel also extends from the strip hole.

[0006] Preferably, an ejection hole is provided on the wedge-shaped block, one end of the ejection hole passes through the base surface of the wedge-shaped block, and the other end passes through the wedge surface of the wedge-shaped block.

[0007] Preferably, the ejection hole is a tapered hole, the larger end of which passes through the base surface of the wedge block, and the smaller end of which passes through the wedge surface of the wedge block.

[0008] Preferably, the large end of the ejection hole passes through the bottom of the base surface of the wedge block, and the small end of the ejection hole passes through the top of the wedge surface of the wedge block.

[0009] Preferably, the front end of the box shell has an arc-shaped flow guide portion.

[0010] Preferably, the water wheel comprises a hub fixed on the roller shaft of the scraper and a plurality of blades fixed on the hub at intervals, and the length of the outer edge of the blade extending out of the casing is greater than the length of the sand scraping blade extending out of the casing.

[0011] Preferably, a right-angled triangle groove is provided on the hub for the corresponding installation of the blades, and the base of the blade is hinged at the right angle of the right-angled triangle groove. The part of the blade close to the base that moves to the lower quadrant of the hub can squeeze the right angle side of the right-angled triangle groove to drive the hub to rotate. The part of the blade away from the base that moves to the upper quadrant of the hub can be pushed through the inner wall of the box shell to store the blade in the right-angled triangle groove.

[0012] Preferably, a groove is provided at the bottom of the outlet section for engagement with the end portion of the blade extending out of the casing.

[0013] First, the present invention provides a sand-raising mechanism at the bottom of the pipe section. This mechanism uses the wedge surface of the wedge block to divert the water, causing the water to flow upward. On the one hand, because the sediment in the water is directly raised by the wedge block, it is prevented from prematurely falling to the bottom of the pipe section due to its own gravity and forming deposits. On the other hand, because the distance between the top of the wedge block and the top of the pipe section continues to decrease, the flow rate of the water through the wedge block is increased, allowing the water to pass through more quickly, thereby reducing the probability of large amounts of sediment in the water being deposited at the bottom of the pipe section. Secondly, the present invention also provides a sand-discharging mechanism at the outlet section. This mechanism drives the rotating water wheel driven by water flushing, driving the sand scraper to move continuously, and smoothly discharges the sediment at the bottom of the outlet section, thereby avoiding or reducing the sediment deposition in the inverted siphon.

[0014] In a preferred embodiment of the present invention, an ejection hole is further provided on the wedge block, which makes full use of the characteristic that the flow velocity of water passing through the wedge block increases due to the continuous decrease in the distance between the top of the wedge block and the top of the pipe body section, so that the high-speed water passing through the top of the wedge block is ejected into the low-speed water on the back side of the wedge block (the low-speed water slows down because the water channel quickly increases after the water flows through the top of the wedge block), thereby causing the sediment in the low-speed water to pass through the top of the wedge block again in the form of a jet, thereby further improving the sand-raising effect of the present invention and further improving the sand-discharging effect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0017] Figure 3 It is a partial enlarged structural diagram of the sand discharge mechanism in the present invention;

[0018] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure in the FF direction;

[0019] Markings in the figure: 1, inlet section, 2, pipe section, 3, outlet section, 301, groove, 4, sand discharge mechanism, 401, box shell, 402, sand scraper, 403, belt, 404, blade, 405, right-angled triangle groove, 406, hub, 407, roller, 5, wedge block, 6, ejection hole. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the present invention presents an inverted siphon water conservancy system that prevents silt blockage. The main body is U-shaped and comprises an inlet section 1, a pipe section 2, and an outlet section 3, which are connected from left to right. Above the pipe section 2 is a natural river or structure that the main canal needs to bypass. The inlet section 1 is higher than the outlet section 3 to allow water to flow through it by gravity. To prevent or reduce silt accumulation in the pipe section 2 and outlet section 3, this embodiment includes a sand-raising mechanism in the pipe section 2 and a sand-discharging mechanism 4 in the outlet section 3.

[0021] The sand-raising mechanism is used to raise the sediment in the water body of the pipe section 2 so that it can pass through the pipe section 2 smoothly under the conveying effect of the water flow, and prevent the sediment from settling at the bottom of the pipe section 2 under the action of its own gravity. Figure 1 and Figure 2 As shown, the sand-raising mechanism includes a plurality of wedge-shaped blocks 5 fixedly arranged at the bottom of the pipe body section 2 , and the plurality of wedge-shaped blocks 5 are evenly spaced along the length direction of the pipe body section 2 . Figure 2 In the embodiment, the wedge surface of the wedge block 5 is distributed toward the water flow direction B, while the base surface of the wedge block 5 is distributed toward the right side. Figure 2 The middle C direction passes through the wedge block 5, obtaining an upward moving component velocity to prevent the sediment from settling downward; on the other hand, along the flow direction of the water body, the gap between the wedge block 5 and the upper edge of the pipe body section 2 gradually becomes smaller, until Figure 2 As shown, the distance E is close to the minimum, which causes the water to gradually accelerate when flowing through the wedge block 5 and reach the maximum speed at E, so that the aforementioned upward component velocity obtained by the sediment is larger, further preventing the sediment from settling downward and forming sediments.

[0022] Figure 2In the example, after the water flows through point E and over the wedge block 5, the water flow slows due to the rapid increase in the water-passing gap. Some sediment may fall into area G and continue to sink, leading to sediment accumulation between the base of the wedge block 5 and the bottom of the pipe section 2. To avoid this problem, the wedge block 5 in this embodiment is provided with an ejection hole 6. Through the ejection hole 6, some of the sediment-laden water in area G is redirected along direction D onto the inclined surface of the wedge block 5. It is then ejected by high-speed water near the top of the wedge block 5, allowing the sediment to regain a larger upward component of velocity and thus preventing sediment accumulation in area G. The ejection hole 6 is conical in shape, with its large end penetrating the base of the wedge block 5, facilitating the entry of more sediment-laden water into area G; its small end penetrating the top of the wedge surface of the wedge block 5, facilitating the high-speed water flow passing through the top of the wedge block 5 to create a vacuum within the ejection hole 6, ejecting the water in area G.

[0023] Still Figure 1 As shown, after passing through the pipe body section 2, the silt in the water is more likely to settle at the bottom of the outlet section 3 due to the inclined structure of the outlet section 3, and may even flow back into the pipe body section 2. In order to discharge the silt introduced by the pipe body section 2 and prevent it from settling between the pipe body section 2 and the outlet section 3, the outlet section 3 of this embodiment is provided with a silt discharge mechanism 4 for discharging the silt in the outlet section 3.

[0024] Combine Figure 1 and Figure 3 (For ease of explanation, Figure 3 (See the schematic diagram for rotating the outlet section 3 and the sand removal mechanism 4 to a horizontal position.) In this embodiment, the sand removal mechanism 4 comprises a housing 401 extending along the length of the outlet section 3 and a scraper disposed within the housing 401. The housing is secured within the outlet section 3 by a bracket (not shown). The housing 401 is sealed on the top and sides, leaving only the bottom open and forming a strip-shaped hole through which the scraper partially extends. The scraper is conventional in the art and comprises two spaced rollers 407, a belt 403 wound around the rollers 407, and a plurality of sand-scraping blades 402 fixed to the belts 403 at intervals. The rollers 407 are rotatably mounted on a bracket fixed within the outlet section 3. The sand-scraping blades 402, located at the lower edge of the belt 403, extend through the strip-shaped holes and engage with a small gap at the bottom of the outlet section 3. As the two rollers 407 rotate, the sand at the bottom of the outlet section 3 is discharged from the outlet section 3 in an upward direction.

[0025] Unlike conventional scrapers, the scraper in this embodiment is equipped with a water wheel on the rotating shaft on the left side. The water wheel is driven to rotate by the impact force of the water flow in the outlet section 3, and no external power is required to drive the scraper to operate to discharge mud and sand. In order to ensure that the water wheel rotates counterclockwise under the action of the water flow direction E in the outlet section 3 to achieve the sand discharge effect, only the lower blades on the water wheel extend from the box shell 401 to receive the impact of the water flow. In order to ensure that the water flow in the outlet section 3 can impact the water wheel blades 404 and drive the scraper to operate, the blades 404 in this embodiment are longer to expand the contact area with the water flow and obtain greater driving force. In this embodiment, since the blades 404 extend out of the box shell 401 for a long time, in order to avoid interference between them and the bottom of the outlet section 3, as shown in FIG. Figure 4 As shown, a groove 301 for accommodating blades 404 is opened at the bottom of the outlet section 3 and at a position corresponding to the water wheel.

[0026] The water wheel in this embodiment includes a hub 406 coaxially fixed to a roller shaft 407 and the aforementioned plurality of blades 404, all of which are fixed to the hub 406 at even intervals along the circumferential direction. Since the blades 404 in this embodiment are relatively long, in order to avoid interference between the blades 404 rotated into the casing 401 and the casing 401, the conventional solution is to increase the height of the casing 401. However, such an arrangement will cause the volume of the casing 401 to become larger, occupying too much space in the outlet section 3, resulting in a weakening of the water delivery capacity. In order to minimize the volume of the casing 401 without interfering with the inner wall of the casing 401, the blades 404 in this embodiment are installed in the following manner:

[0027] Still Figure 3 As shown, a plurality of right-angled triangular slots 405 for the blades 404 to be mounted are evenly spaced along the circumference of the hub 406. The blades 404 are hinged at the right angles of the right-angled triangular slots 405 and are kept in close contact with the short sides of the right-angled triangular slots 405 by torsion springs. Figure 3 When the bottommost blade 404 is impacted by water flow in direction E, its base presses against the edge of the right-angled triangle groove 405, driving the hub 406 to rotate. As the hub 406 rotates, the blade 404 enters the housing 401. The movement of the inner wall of the housing 401 overcomes the torsion spring, allowing it to rotate and rest against the long side of the right-angled triangle groove 405, where it is stored. This allows the water wheel of this embodiment to be installed without increasing the height or volume of the housing 401, allowing it to be continuously impacted by the water flow in the outlet section 3.

Claims

1. An inverted siphon water conservancy system for preventing sediment blockage, comprising an inlet section (1), a pipe section (2) and an outlet section (3), characterized in that: The pipe section (2) is provided with a sand-raising mechanism for raising sediment in the water body to prevent it from settling at the bottom of the pipe section (2); the outlet section (3) is provided with a sand-discharging mechanism (4) for discharging sediment introduced through the pipe section (2) to prevent it from settling between the pipe section (2) and the outlet section (3); The sand-raising mechanism comprises a plurality of wedge-shaped blocks (5) spaced apart along the length direction of the pipe body section (2), wherein the wedge surface of each wedge-shaped block (5) is distributed in the direction of the water flow; the sand-discharging mechanism (4) comprises a box shell (401) distributed along the length direction of the outlet section (3) and a scraper arranged in the box shell (401); a strip hole is provided at the bottom of the box shell (401); the strip hole allows the sand-scraping scraper (402) on the scraper to extend and fit into a small gap with the bottom of the outlet section (3); a water wheel is also provided on the roller shaft (407) of the scraper, and the lower edge of the water wheel also extends from the strip hole; An ejection hole (6) is provided on the wedge-shaped block (5), one end of the ejection hole (6) penetrates the base surface of the wedge-shaped block (5), and the other end penetrates the wedge surface of the wedge-shaped block (5).

2. The anti-silt blockage inverted siphon water conservancy system according to claim 1, characterized in that: The ejection hole (6) is a tapered hole, the larger end of which penetrates the base surface of the wedge block (5), and the smaller end of which penetrates the wedge surface of the wedge block (5).

3. The anti-silt blockage inverted siphon hydraulic system according to claim 2, characterized in that: The large end of the ejection hole (6) penetrates the bottom of the base surface of the wedge-shaped block (5), and the small end of the ejection hole (6) penetrates the top of the wedge surface of the wedge-shaped block (5).

4. The anti-silt blockage inverted siphon hydraulic system according to claim 1, characterized in that: The front end of the box shell (401) has an arc-shaped flow guide portion.

5. The anti-silt blockage inverted siphon hydraulic system according to claim 1, characterized in that: The water wheel comprises a hub (406) fixed on a roller shaft (407) of a scraper and a plurality of blades (404) fixed at intervals on the hub (406). The length of the outer edge of the blade (404) extending out of the casing (401) is greater than the length of the sand scraping blade (402) extending out of the casing (401).

6. The anti-silt blockage inverted siphon hydraulic system according to claim 5, characterized in that: A right-angled triangular groove (405) for corresponding installation of the blade (404) is provided on the wheel hub (406). The base of the blade (404) is hinged at the right angle of the right-angled triangular groove (405). The portion of the blade (404) close to the base that moves to the lower quadrant of the wheel hub (406) can squeeze the right-angled side of the right-angled triangular groove (405) to drive the wheel hub (406) to rotate. The portion of the blade (404) away from the base that moves to the upper quadrant of the wheel hub (406) can be moved through the inner wall of the box shell (401) to store the blade (404) in the right-angled triangular groove (405).

7. The anti-silt blockage inverted siphon hydraulic system according to claim 5, characterized in that: The bottom of the outlet section (3) is provided with a groove (301) for the end of the blade (404) extending out of the box shell (401) to cooperate with.

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