A device for mitigating scour

Abstract

The present application relates to the technical field of scouring, and particularly relates to a device for reducing scouring, comprising a fairing, two parallel flow channels are arranged in the fairing, a fairing end is arranged between the inlets of the two flow channels, the fairing end is located at the upstream side of the flow channel inlets, the flow channel comprises a first bend and two second bends, the first included angle alpha between the inlet and the outlet of the first bend is 0°<alpha≤90°, the second included angle beta between the inlet and the outlet of the second bend is 90°<beta<180°, the first bend and the second bend of the same flow channel are arranged alternately, and the second bend closest to the outlet of the flow channel, the fairing is located at the upstream of the protected object, and the outlet of the flow channel and the protected object are spaced apart. The device can not only weaken the scouring of the protected object and the riverbed in front of the protected object, but also prevent the riverbed in front of the anti-scouring structure from being scoured due to the water blocking effect.

Description

Technical Field

[0001] This invention relates to the field of anti-erosion technology, and in particular to a device for reducing the impact of a brush. Background Technology

[0002] The construction of bridge piers in river channels obstructs the natural flow velocity and direction of water, creating a water-blocking effect in front of the piers. This increases the flow velocity and sediment-carrying capacity, leading to downcutting and erosion of the riverbed around the piers. This results in severe localized erosion at the pier locations, causing concrete erosion and peeling on the water-facing side of the pile foundations, exposing the reinforcing steel, and ultimately damaging the pile foundation structure, seriously impacting the safety of the bridge structure. Current main protective measures include designing bridge piers in a boat-shaped or spindle-shaped streamlined shape to reduce the water-facing area and mitigate the obstruction of water flow; constructing dikes at the piers and other river structures to adjust the water flow direction; and reinforcing the riverbed with materials such as riprap to strengthen its resistance to erosion and prevent downcutting caused by riverbed erosion. However, the above methods are all passive defenses. As the river's flow direction changes seasonally, the effectiveness of boat-shaped piers or diversion dams will decrease. Reinforcing the riverbed with riprap forcibly alters the natural riverbed, drastically changing the river's morphology outside the riprap area, causing water quality and ecological deterioration, groundwater recharge obstruction, and other disasters. Furthermore, while setting up barrier structures in front of or enclosing structures on the outside of the structure can protect the structure itself, it can also cause erosion of the riverbed in front of the barrier or enclosing structure, further altering the river's morphology and reducing the effectiveness of the erosion control structure. Summary of the Invention

[0003] The purpose of this invention is to overcome the problem that in the prior art, the anti-scour structure of underwater structures, although protecting the corresponding structures, will cause scour to the riverbed in front of the anti-scour structure, and to provide a device for reducing and buffering scour.

[0004] In a first aspect, the present invention provides a device for reducing the impact of a brush, comprising a shroud, wherein two parallel flow channels are provided inside the shroud, and a rectifying end is provided between the inlets of the two flow channels. The rectifying end is located upstream of the inlet of the flow channel. The flow channel includes a first bend and two second bends. The first included angle α between the inlet and outlet of the first bend is 0°<α≤90°, and the second included angle β between the inlet and outlet of the second bend is 90°<β<180°. The first bend and the second bend of the same flow channel are arranged alternately, and the second bend is closest to the outlet of the flow channel. The shroud is located upstream of the object being protected, and there is a gap between the outlet of the flow channel and the object being protected.

[0005] There are no special restrictions on the materials used in this device, such as metal structures or plastic structures.

[0006] If a single fairing is used for protection, the width of the fairing can be designed according to the protection width of the object being protected, so that it can effectively cover the protection range of the object being protected, so that the water flow after being slowed down by the fairing can flow naturally through the object being protected, thereby avoiding the water flow that has not been slowed down from scouring the object being protected; the height of the fairing can be designed according to parameters such as the normal water depth and the extreme water depth, combined with the water depth value.

[0007] The angle between the inlet and outlet of a bend, i.e., the turning angle or steering angle, is the angle between the inlet and outlet sections of the bend. In other words, the first bend is sharper than the second bend, and the second bend is gentler than the first bend. The flow channel in this design can be arranged in a sequence of first bend, second bend, first bend, and second bend, or in a sequence of second bend, first bend, and second bend. The inlet, outlet, and each bend can be directly connected or connected via a straight section (i.e., without bend structures) depending on the actual situation. Water flowing into the flow channel experiences collision and energy dissipation as it passes through the sharper first bend, thus slowing it down. Flowing through the gentler second bend helps to straighten the flow and prevent vortices. The alternating arrangement of the first and second bends, with the second bend being closest to the outlet, minimizes water resistance during flow, effectively slowing the water and reducing the impact on riverbed scouring. The specific flow channel layout, whether to add an additional direct current section, the specific turning angles of the first and second bends, the width of the flow channel, and other parameters can be considered based on the average annual flow velocity of the waterway. Flow channel collision design is carried out to ensure that the flow velocity at the flow channel outlet is 1-2 m / s. That is, the flow channel of this application can reduce the flow velocity in front of the protected object without creating still water, thus preventing the water blocking effect of the existing anti-scour structure from being compromised, thereby preventing the riverbed in front of the protected object from being scourted and the riverbed in front of this device from being scourted.

[0008] While the arrangement of the two flow channels is not required to be completely symmetrical, and can be adapted to the specific water flow conditions, an axially symmetrical arrangement results in lower design and manufacturing efficiency and difficulty, and more controllable and reliable protection. Similarly, the two first bends within the same flow channel are not required to have the same turning angle, nor are the two second bends; they are designed based on the speed reduction requirements.

[0009] The fairing includes two parallel flow channels. Compared to setting a single flow channel within the width of the fairing, the distance between two adjacent bends in the same flow channel is relatively closer, and the path of the bend can be shorter. This results in multiple slow decelerations rather than drastic decelerations, which can achieve multiple small-amplitude decelerations. This further avoids the device from creating a water-blocking effect on the water flow, thereby preventing the riverbed from being eroded.

[0010] The water-blocking position of the device is the rectifier end at the front end. The rectifier end can adopt a streamlined shape as in the existing technology. The diversion direction corresponds to the inlet of the flow channel on both sides, thereby effectively diverting and diffusing the water flow into the flow channel on both sides, accelerating the flow into the flow channel, and reducing the water-blocking effect generated by the device.

[0011] Some waterways exhibit significant seasonal variations in water flow velocity. When the water flow velocity is high, the device can effectively reduce speed to prevent scouring. When the water flow velocity is low, the device has a very low water resistance effect, allowing the water to flow naturally through the channel, reducing the collision effect and thus preventing water resistance. This ensures the anti-scouring effect of the device in each cycle.

[0012] Because of its low water resistance, the fairing can be installed on the riverbed through a supporting structure, or on the object being protected, or on structures on both sides of the river.

[0013] This device artificially intervenes in the water flow near the structure, changing the flow velocity and reducing the interaction with the bridge piers and other structures. This slows down the scouring of the riverbed near the bridge piers, and when the interaction is reduced to a very small value, the scouring problem is solved.

[0014] This invention provides a buffer brush device. Compared with the existing anti-scour devices that use the concepts of blocking and intercepting water, this device adopts a speed reduction and deceleration method. Through the design of the flow channel, it does not directly block water. The direction of water flow is adjusted by multiple collisions during the flow through the flow channel. In this process, the kinetic energy is reduced, thereby reducing the flow velocity. Moreover, the deceleration is done in multiple small-amplitude decelerations, which can not only ensure effective deceleration and protect the protected object, but also prevent the water blocking effect from scouring the riverbed in front of the anti-scour structure, thus extending the effective period of the device's anti-scour effect. There is also a gap between the flow channel outlet and the protected object, so that the sediment of the low-speed water flow settles in front of the protected object, which is beneficial to protecting the riverbed at the protected object.

[0015] In some embodiments, the first included angle α (i.e., turning angle) between the inlet and outlet of the first bend is 45°≤α≤90° or 45°≤α≤60°, and the second included angle β (i.e., turning angle) between the inlet and outlet of the second bend 22 is 100°≤β≤165° or 100°≤β≤135°. The design is based on actual conditions to meet the design requirements of multiple small-amplitude reduction of water flow, while avoiding the occurrence of vortices.

[0016] In some embodiments, a turning area is also provided at the first curve located between two adjacent second curves.

[0017] That is, a concave swirling zone is formed at the first bend by hollowing out. The swirling zone is arranged after the water flow has passed through at least one bend. That is, the swirling zone is set in the flow channel after the water flow has been decelerated. This improves the collision efficiency of the water flow at the first bend, shortens the overall length of the fairing and the number of bends, and increases the range of incoming flow velocities that can be adapted.

[0018] In some embodiments, the second included angle between the entrance and exit of the second bend is replaced by 90°≤β<180°.

[0019] When a turning zone is provided, the turning angle of the second curve can also be equal to 90°.

[0020] In some embodiments, the flow channel includes two of the first bends.

[0021] In some embodiments, the inlet of the flow channel has a direct current section between the first bend at the beginning, and / or the outlet of the flow channel has a direct current section between the second bend at the end.

[0022] The DC section is not a curved structure. The DC section located at the inlet of the flow channel can further rectify the incoming flow, while the DC section located at the outlet of the flow channel ensures the isolation effect between the rectified water flow and the un-decelerated water flow outside the rectifier.

[0023] The DC section can have a uniform cross-section or a gradually decreasing width. The extension direction of the DC section is arranged according to the guiding direction of the rectifier end.

[0024] In some embodiments, the width of the fairing gradually increases from the upstream side to the downstream side, and the distance between the flow channel outlet and the protected object is preferably 5-30 cm. This helps to ensure the isolation effect between the water flow inside the fairing and the un-decelerated water flow, avoiding the water flow outside the fairing from interfering with the flow due to the velocity difference due to an excessively large distance, thus affecting the water flow deceleration and steady-state effect; it also avoids the flow channel outlet from being blocked due to an excessively small distance, resulting in a still water state inside the fairing, thereby creating a new water-blocking scouring effect in front of the deceleration device.

[0025] In some embodiments, the fairing is connected to a mounting base for connecting the protected object.

[0026] It can be fixedly connected to the corresponding protected object via the mounting bracket, with the rectifier end facing the direction of the incoming flow.

[0027] In some embodiments, the mounting base is further connected to a tail rudder, which is arranged opposite to the fairing. The protected object is provided with a slide rail, and the mounting base is slidably connected to the slide rail. The tail rudder deflects under the action of water flow, which causes the fairing to deflect accordingly.

[0028] By employing a tail rudder and fairing arranged opposite each other, the water flow can be stabilized when passing over the tail rudder, reducing the rear vortex and thus reducing rear scouring. Furthermore, when the water flow direction changes, the lateral component of the water flow force on both sides of the tail rudder changes. This change in the lateral component can drive the tail rudder to rotate, which in turn drives the fairing to rotate, ensuring that the fairing end always faces the water flow direction. This allows the fairing to adapt to changes in the water flow direction and operate under optimal conditions, greatly improving efficiency.

[0029] In some embodiments, the tail rudder is a plate-like member arranged vertically.

[0030] The plates of the plate-shaped components are arranged vertically, and the cross-section of the plate-shaped components is streamlined, such as arrow-shaped, teardrop-shaped, or spindle-shaped.

[0031] In some embodiments, the fairing includes two side plates and a middle plate, the middle plate and the corresponding side plates forming the flow channel, the middle plate being connected to the mounting base, the middle plate being connected to the side plates via a connecting rod located upstream of the flow channel inlet and / or downstream of the flow channel outlet, and the middle plate having a through hole in the spaced portion.

[0032] The flow channel can be formed by installing protrusions or hollowing out the plate.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] 1. This invention provides a buffer brush device. Compared with the existing anti-scour devices that use the concepts of blocking and intercepting water, this device adopts a speed reduction and deceleration method. Through the design of the flow channel, it does not directly block water. The direction of water flow is adjusted by multiple collisions during the flow through the flow channel. In this process, the kinetic energy is reduced, thereby reducing the flow velocity. Moreover, the deceleration is done in multiple small-amplitude decelerations, which can not only ensure effective deceleration and protect the protected object, but also prevent the water blocking effect from scouring the riverbed in front of the anti-scour structure, thus extending the effective period of the device's anti-scour effect. There is also a gap between the flow channel outlet and the protected object, so that the sediment of the low-speed water flow settles in front of the protected object, which is beneficial to protecting the riverbed at the protected object.

[0035] 2. This invention provides an anti-erosion system with a wide protection range, more flexible design, better adaptability, and higher level of refinement. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the planar structure of a device for reducing the buffer brush in Embodiment 1; Figure 2 This is a three-dimensional structural diagram of a device for reducing the buffer brush in Embodiment 1; Figure 3This is a schematic diagram of the water flow in a device for reducing the buffer brush in Example 1; Figure 4 This is a schematic diagram of sediment deposition in a buffer brush device according to Example 1; Figure 5 This is a schematic diagram of the planar structure of a buffer brush device in Embodiment 2; Figure 6 This is a three-dimensional structural diagram of a device for reducing the buffer brush in Embodiment 2 (some side plates are not shown). Figure 7 This is a schematic diagram of the water flow in a device for reducing the buffer brush in Example 2; Figure 8 This is a schematic diagram of the planar structure of the fairing of a device for reducing the buffer brush in Embodiment 3; Figure 9 This is a schematic diagram of the planar structure of a device for reducing the buffer brush in Example 4.

[0037] Marked in the image: 0-Protected object, 1-Fairing, 11-Rectifier end, 12-Side plate, 13-Middle plate, 111-Connecting rod, 131-Through hole, 21-First bend, 22-Second bend, 23-Turning zone, 24-DC section, 3-Mounting base, 4-Tail rudder. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0039] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0040] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0041] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0042] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0043] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0044] Example 1 like Figures 1-3As shown, a device for reducing the impact of a brush includes a shroud 1. The shroud 1 has two parallel flow channels. A rectifier end 11 is located between the inlets of the two flow channels. The rectifier end 11 is located upstream of the inlet of the flow channel. The flow channel includes a first bend 21 and two second bends 22. The first included angle α between the inlet and outlet of the first bend 21 is 0° < α ≤ 90°. The second included angle β between the inlet and outlet of the second bend 22 is 90° < β < 180°. The first bend 21 and the second bend 22 of the same flow channel are arranged alternately, and the second bend 22 is closest to the outlet of the flow channel. That is, among the two second bends 22, the downstream second bend 22 is not provided with a bend structure (neither the first bend 21 nor the second bend 22 is provided). The shroud 1 is located upstream of the protected object 0, and there is a gap between the outlet of the flow channel and the protected object 0.

[0045] Specifically, as in this embodiment, the pier is taken as the protected object 0, such as Figures 1-2 As shown, two of these devices are arranged along the height of the pier. The specific number and height are determined based on water depth, protection requirements, etc. The rectifier 1 includes two side plates 12 and a central plate 13. The central plate 13 is located between the two side plates 12. A rectifier end 11 is provided at the front end of the central plate 13. The rectifier end 11 can be umbrella-shaped, hemispherical, or conical in shape. Those skilled in the art can understand this by referring to the accompanying drawings and the rectifier function. The rectifier end 11 protrudes from the front of the side plates 12 and is used to guide the diverted water flow to accelerate into the flow channels on both sides. The central plate 13 and the corresponding side plates 12 are used to form flow channels for water flow. The width of the rectifier 1 gradually increases from the upstream side to the downstream side (width is...). Figure 1 (Up and down direction) The width of the fairing 1 is designed so that the extension lines of the two inclined side plates 12 of the fairing 1 extend beyond the outer edge of the corresponding side of the pier. It is designed to match the gap between the flow channel outlet of the fairing 1 and the protected object 0, that is, the gap between the downstream end of the side plate 12 and the protected object 0, such as 5-30cm, so as to form an effective anti-scouring range coverage, so that the decelerated water flow can flow through the protected object 0 and avoid the undecelerated water flow from scouring the pier.

[0046] The middle plate 13 can be connected to the side plate 12 via the connecting rod 111 (for ease of demonstration). Figure 2 (The middle part of the side plate 12 is not shown). The connecting rod 111 is located upstream of the inlet of the flow channel and / or downstream of the outlet of the flow channel. It is set according to the length of the flow channel and the stress of the structure, etc., and the number of times it is set at the bend is reduced. For example, in this embodiment, it is set after the last bend. It can also be added before the first bend. The middle plate 13 is used to connect the pier. The length of the middle plate 13 exceeds that of the side plate 12. The middle plate 13 has a through hole 131 in the part between the outlet of the flow channel and the protected object 0.

[0047] The middle plate 13 is connected to the mounting base 3, and the mounting base 3 is also connected to the tail rudder 4. The tail rudder 4 is arranged opposite to the fairing 1. The protected object 0 is provided with a slide rail. The mounting base 3 is slidably connected to the slide rail. The tail rudder 4 can be a plate-shaped component arranged vertically. The cross-section of the plate-shaped component is arrow-shaped (with rounded chamfers at the corners, not shown) or flat or other shapes. The specific slide rail structure, etc., can refer to the design of the prior art. The tail rudder 4 can be connected to the mounting base 3 through a rod and is at a certain distance from the mounting base 3.

[0048] The flow channel structure in this embodiment is arranged in a sequence of first bend 21, second bend 22, and second bend 22. A straight section 24 connects the outlet of the flow channel to the final second bend 22. The first included angle α (i.e., turning angle) between the inlet and outlet of the first bend 21 is 45°≤α≤90° or 45°≤α≤60°. The second included angle β (i.e., turning angle) between the inlet and outlet of the second bend 22 is 100°≤β≤165° or 100°≤β≤135°. The specific angles are designed according to actual conditions to meet the design requirements of multiple, small-amplitude reductions in water flow while avoiding vortex formation. The first bend 21 is relatively sharp, while the second bend 22 is relatively gentle. Figure 3 To understand this, we can use the illustration of changes in water flow direction.

[0049] To form the corresponding flow channel structure, the protruding and concave structures on the opposite surfaces of the side plate 12 and the middle plate 13 cooperate with each other to form the flow channel. In this embodiment, the inner wall of the flow channel is arc-shaped. For example, the first bend 21 is formed by the concave structure on the side plate 12 cooperating with the fin-shaped protruding surface on the corresponding side of the middle plate 13. The first bend 22 is formed by the arc-shaped protruding structure extending from the side plate 12 cooperating with the fin-shaped concave part. The second bend 22 is schematically shown to have a wider inlet than outlet, which is actually based on the need for speed reduction design of the overall flow channel. Not an absolute limitation, but determined according to the speed reduction target, the second first bend 21 is formed by the upper and lower concave structures of the side plate 12 and the fish-fin-shaped protrusions on the corresponding side of the middle plate 13. The first bend 21 is shown to be wider than the first bend 21 in terms of overall width. In fact, it is also based on the needs of the overall flow channel speed reduction design and is not an absolute limitation. The second second bend 22 is formed by the arc-shaped protrusions of the side plate 12 and the fish-body-like structures on the corresponding side of the middle plate 13. The outlets and inlets between the two adjacent bends are basically connected to each other.

[0050] As water flows out of the channel outlet, the flow velocity decreases, the scouring efficiency decreases, and the ability to carry sediment decreases, forming a sedimentation zone in front of the bridge piers, protecting the riverbed at the bridge piers / piles. Figure 4 As shown.

[0051] In some alternative embodiments, the fairing 1 may also be arranged in a longitudinally uniform manner.

[0052] In some alternative embodiments, the flow channel is not specifically limited to whether the width is uniform or designed according to the speed reduction requirements.

[0053] In some alternative embodiments, the fairing 1 may also be installed in the river channel.

[0054] In some optional embodiments, the flow channel may be arranged in the order of second bend 22, first bend 21 and second bend 22. A direct current section 24 may be added before the first second bend 22, after the second second bend 22 and between the first bend 21 and the second bend 22 as needed.

[0055] In some alternative embodiments, the mounting base 3 can be fixedly connected to the protected object 0 without the need for a tail rudder 4. For example, the fairing 1 can be fixedly connected to the protected object 0 by means of clamps, pre-embedded structural connections, etc., or the device can be locked to the bridge pier structure by a positioning lock pin.

[0056] In some alternative embodiments, the rectifier terminal 11 can be as follows: Figure 1 The structure shown has a gap with the flow channel formed on the middle plate 13, and can also be connected as one piece.

[0057] In some alternative embodiments, the fairing 1 may be a plastic structure or a plastic-clad steel structure.

[0058] The device is easy to maintain during use. The rectifier end 111 at the nose can prevent large objects in the water from entering the device to a certain extent. If the device accumulates in the lower layer as the flow rate decreases, it can be permanently buried in the sediment. The upper part of the device that needs to be drained can be disassembled, cleaned, and then reinstalled.

[0059] For example, for piers and columns, several of these devices can be installed. These devices are arranged along the height of the protected object 0. If the actual needs are met, the orientation of the rectifier end 11 of the buffer brush device at different heights can be different, and the flow channel design can also be different. The height of each buffer brush device is determined comprehensively based on factors such as water depth, flow velocity distribution in the height direction, and installation conditions.

[0060] This invention provides a buffer brush device. Compared with the existing anti-scour devices that use the concepts of blocking and intercepting water, this device adopts a speed reduction and deceleration method. Through the design of the flow channel, it does not directly block water. The direction of water flow is adjusted by multiple collisions during the flow through the flow channel. In this process, the kinetic energy is reduced, thereby reducing the flow velocity. Moreover, the deceleration is done in multiple small-amplitude decelerations, which can not only ensure effective deceleration and protect the protected object, but also prevent the water blocking effect from scouring the riverbed in front of the anti-scour structure, thus extending the effective period of the device's anti-scour effect. There is also a gap between the flow channel outlet and the protected object, so that the sediment of the low-speed water flow settles in front of the protected object, which is beneficial to protecting the riverbed at the protected object.

[0061] Example 2 A device for reducing the buffer brush has a structure largely the same as that of Embodiment 1, except that a swirling zone 23 is also provided at the first bend 21 located between two adjacent second bends 22. That is, if the bend design is a flow channel form of two first bends 21 + two second bends 22, then a swirling zone 23 is provided at the second first bend 21. Figures 5-6 As shown, the water flow passing through the swirling zone 23 can undergo multiple collisions to improve collision efficiency, such as... Figure 7 As shown, the arrow at the swirling zone 23 indicates that the water flow will collide multiple times here, effectively reducing kinetic energy. If the bend design is a flow channel form of second bend 22 + first bend 21 + second bend 22, then the swirling zone 23 is set at the first bend 21.

[0062] The second included angle between the entrance and exit of the second curve 22 can also be replaced with 90°≤β<180° or 90°≤β≤150°.

[0063] Example 3 A device for reducing the buffer brush has a structure largely the same as that of Embodiment 2, except that two adjacent bends in the flow channel can be directly connected (i.e., the outlet of the previous bend directly connects to the inlet of the next bend) or connected via a DC section 24 (i.e., there is a DC section 24 between the outlet of the previous bend and the inlet of the next bend). The DC section 24 can be arranged laterally along the fairing 1 or obliquely. See also... Figure 5 As shown, a gradually widening DC section 24 is provided downstream of the second bend 22.

[0064] In some optional embodiments, a direct current section 24 is provided between the inlet of the flow channel and the first bend 21 or the second bend 22 at the beginning, that is, a direct current section 24 is added at the inlet of the flow channel, such as... Figure 8 As shown, the extension direction of the DC section 24 is adapted to the shunt direction of the rectifier end 11.

[0065] In some alternative embodiments, the flow channel structure including the DC section 24 (the DC section may be at the beginning, middle or end of the flow channel) may also omit the swirling area 23.

[0066] Example 4 A device for reducing the buffer brush has a structure that is largely the same as that in Embodiment 2, except that the turning angles of the first bend 21 and the second bend 22 are both 90°. Figure 9 As shown, in this embodiment, the inner side of the flow channel has a vertical straight surface structure, and the inside and outside corners of the bends can be chamfered. The first bend 21 has two outlets, that is, after the water flow is guided into the first bend 21 by the rectifying end 11 and collides with it, it enters the corresponding second bend 22 through two different outlets. Figure 9 The branching arrows after the first bend 21 indicate that after passing through the first bend 21, the water flow branches off from both sides and enters the corresponding second bend 22, and then converges into the second bend 21. The second bend 21 has the same structure as the first bend 21 and also has two outlets, which are respectively connected to the second bend 22.

[0067] 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, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for reducing the buffer brush, characterized in that, The device includes a fairing (1), which has two parallel flow channels. A rectifier end (11) is located between the inlets of the two flow channels. The rectifier end (11) is located upstream of the inlet of the flow channel. The flow channel includes a first bend (21) and two second bends (22). The first included angle α between the inlet and outlet of the first bend (21) is 0°<α≤90°. The second included angle β between the inlet and outlet of the second bend (22) is 90°<β<180°. The first bend (21) and the second bend (22) of the same flow channel are arranged alternately, and the second bend (22) is closest to the outlet of the flow channel. The fairing (1) is located upstream of the protected object (0), and there is a gap between the outlet of the flow channel and the protected object (0).

2. The device for reducing the buffer brush according to claim 1, characterized in that, A turning area (23) is also provided at the first bend (21) located between two adjacent second bends (22).

3. The device for reducing the buffer brush according to claim 2, characterized in that, The second included angle between the entrance and exit of the second bend (22) is replaced with 90°≤β<180°.

4. The device for reducing the buffer brush according to claim 2, characterized in that, The flow channel includes two first bends (21).

5. The device for reducing the buffer brush according to claim 4, characterized in that, The inlet of the flow channel has a direct current section (24) between the first bend (21) at the beginning, and / or the outlet of the flow channel has a direct current section (24) between the last bend (22).

6. The device for reducing the buffer brush according to claim 4, characterized in that, The width of the fairing (1) gradually increases from the upstream side to the downstream side, and the distance between the flow channel outlet and the protected object (0) is 5-30cm.

7. The device for reducing the buffer brush according to any one of claims 1-6, characterized in that, The fairing (1) is connected to a mounting base (3), which is used to connect the protected object (0).

8. The device for reducing the buffer brush according to claim 7, characterized in that, The mounting base (3) is also connected to a tail rudder (4), which is arranged opposite to the fairing (1). The protected object (0) is provided with a slide rail, and the mounting base (3) is slidably connected to the slide rail.

9. The device for reducing the buffer brush according to claim 8, characterized in that, The tail rudder (4) is a plate-shaped component arranged vertically.

10. The device for reducing the buffer brush according to claim 7, characterized in that, The fairing (1) includes two side plates (12) and a middle plate (13). The middle plate (13) and the corresponding side plate (12) are used to form the flow channel. The middle plate (13) is connected to the mounting base (3). The middle plate (13) is connected to the side plate (12) by a connecting rod (111). The connecting rod (111) is located upstream of the flow channel inlet and / or downstream of the flow channel outlet. The middle plate (13) has a through hole (131) in the spaced portion.

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