90-degree elbow pipe, u-shaped elbow pipe and large-flow water cannon structure for water cannon structure

Abstract

The present application relates to 90-degree elbow pipe, U-shaped elbow pipe and large-flow water gun structure for water gun structure; solve the existing water gun structure is affected by the curvature radius of 90-degree elbow pipe and U-shaped elbow pipe, which causes energy loss and affects the water gun jet bunching and range problem; 90-degree elbow pipe includes 90-degree elbow pipe body, 90-degree elbow pipe body is composed of inner elbow pipe and outer elbow pipe, the inner side wall of inner elbow pipe is provided with first thickening part, the side away from the center O1 of inner elbow pipe of first thickening part is spherical surface structure, the side close to the center O1 of inner elbow pipe is adapted with the inner side wall of inner elbow pipe, the center O2 of spherical surface of first thickening part is located on the 45-degree bisector of 90-degree elbow pipe, on the 45-degree bisector, first thickening part and inner elbow pipe satisfy the following relationship: 1 A / B≤1.1; wherein, A represents the distance of first thickening part spherical surface to the center O1 of inner elbow pipe, B represents the distance of inner side wall of inner elbow pipe to the center O1 of inner elbow pipe; the present application proposes U-shaped elbow pipe and large-flow water gun structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a water cannon, in particular to a 90-degree elbow pipe, a U-shaped elbow pipe and a large-flow water cannon structure for a water cannon structure. BACKGROUND

[0002] The current water cannon, especially the large-flow water cannon, has a relatively complex rotating structure due to the functional needs. In the use process, after the water flow passes through the 90-degree elbow pipe, the U-shaped elbow pipe and the cannon head, a large amount of energy is lost, and the internal flow field is also disturbed, which finally leads to a high degree of turbulence of the water flow at the outlet of the water cannon head, and the water column is dispersed too early, thereby affecting the convergence and range of the water cannon jet. Therefore, in order to improve the convergence and range of the water cannon jet, the energy loss and the turbulence degree of the water flow at the outlet of the cannon head should be reduced as much as possible.

[0003] The guide plate, the flow straightener and the pipe structure in the water cannon structure are very important for improving the stability of the final water cannon head outlet flow. However, the existing guide plate structure and pipe structure do not make special design for the problem that the curvature difference between the inside and outside of the large-flow water cannon is too large under a large pipe diameter. When the water flow passes through the 90-degree elbow pipe and the U-shaped elbow pipe, a large flow velocity difference is generated due to the influence of the curvature radius. The fluid generates cross flow in the curved pipe under the action of the centrifugal force, and forms vortex flow in the pipe under the action of the pipe wall, thereby causing energy loss and increasing the turbulence degree. If the vortex area continues from the elbow pipe to the cannon head, a continuous adverse effect is generated, which causes the turbulence degree of the water flow at the outlet of the cannon nozzle to be still high, and the jet is dispersed and the range is reduced. SUMMARY

[0004] The purpose of the present application is to solve the problem that the existing water cannon structure is affected by the curvature radius of the 90-degree elbow pipe and the U-shaped elbow pipe, thereby causing energy loss and affecting the convergence and range of the water cannon jet, and to provide a 90-degree elbow pipe, a U-shaped elbow pipe and a large-flow water cannon structure for a water cannon structure.

[0005] The technical solution adopted by the present application is as follows:

[0006] A 90-degree elbow pipe for a water cannon structure, comprising a 90-degree elbow pipe body, the 90-degree elbow pipe body being composed of an inner elbow pipe and an outer elbow pipe, and the special feature is that:

[0007] The inner side wall of the inner elbow pipe is provided with a first thickening part connected to both ends of the inner elbow pipe and having a crescent structure in the axial section, the side of the first thickening part away from the center O1 of the inner elbow pipe is a spherical curved surface structure, the side close to the center O1 of the inner elbow pipe is matched with the inner side wall of the inner elbow pipe, the center O2 of the spherical curved surface of the first thickening part is located on the 45-degree bisector of the 90-degree elbow pipe, and the first thickening part and the inner elbow pipe satisfy the following relationship on the 45-degree bisector: 1

[0008] Further, a first circular-arc flow guide plate is arranged in the middle of the 90-degree elbow pipe body in the axial direction of the 90-degree elbow pipe body, the center of the middle split surface of the first circular-arc flow guide plate in the axial direction of the 90-degree elbow pipe body is concentric with the center O1 of the inner elbow pipe, and the two side walls of the first circular-arc flow guide plate are connected with the inner wall of the 90-degree elbow pipe body.

[0009] The side of the first circular-arc flow guide plate away from the first thickening part is provided with a second thickening part connected to both ends of the first circular-arc flow guide plate and having a crescent structure in the axial section, the side of the second thickening part away from the center O1 of the inner elbow pipe is a spherical curved surface structure, the side close to the center O1 of the inner elbow pipe is matched with the first circular-arc flow guide plate, the center O3 of the spherical curved surface of the second thickening part is located on the 45-degree bisector of the 90-degree elbow pipe body, and the second thickening part and the first circular-arc flow guide plate satisfy the following relationship on the 45-degree bisector: 1

[0010] Further, in the first thickening part, A / B = 1.1.

[0011] In the second thickening part, A1 / B1 = 1.07.

[0012] The application further provides a U-shaped elbow pipe for a water cannon structure, which comprises a U-shaped elbow pipe body, and the U-shaped elbow pipe body comprises a U-shaped inner elbow pipe and a U-shaped outer elbow pipe, and the special feature is that:

[0013] The inner side wall of the U-shaped inner elbow pipe is provided with a third thickening part connected to both ends of the U-shaped inner elbow pipe and having a crescent structure in the axial section, the side of the third thickening part away from the center O4 of the U-shaped inner elbow pipe is a spherical curved surface structure, the side close to the center O4 of the U-shaped inner elbow pipe is matched with the inner side wall of the U-shaped inner elbow pipe, the center O5 of the spherical curved surface of the third thickening part is located on the 90-degree bisector of the U-shaped inner elbow pipe, and the third thickening part and the U-shaped inner elbow pipe satisfy the following relationship on the 90-degree bisector: 1 A3 / B3≤1.1; wherein A3 represents the distance from the third thickening part to the center O4 of the U-shaped inner elbow pipe, and B3 represents the distance from the inner side wall of the U-shaped inner elbow pipe to the center O4 of the U-shaped inner elbow pipe.

[0014] Further, a second arc-shaped guide plate is arranged in the middle of the U-shaped bent pipe body along the axial direction of the U-shaped bent pipe body, the center of the second arc-shaped guide plate along the axial direction of the U-shaped bent pipe body is concentric with the center O4 of the U-shaped inner bent pipe, and the two side walls of the second arc-shaped guide plate are connected with the inner wall of the U-shaped bent pipe body.

[0015] The second arc-shaped guide plate is provided with a fourth thickening part connected with both ends of the second arc-shaped guide plate and having a crescent-shaped structure in the axial cross section on the side away from the third thickening part, the side of the fourth thickening part away from the center O4 of the U-shaped inner bent pipe is a spherical curved surface structure, the side close to the center O4 of the U-shaped inner bent pipe is matched with the second arc-shaped guide plate, the center O6 of the spherical curved surface of the fourth thickening part is located on the 90-degree bisector of the U-shaped bent pipe body, and on the 90-degree bisector, the fourth thickening part and the second arc-shaped guide plate satisfy the following relationship: 1

[0016] Further, in the third thickening part, A3 / B3=1.07.

[0017] In the fourth thickening part, A4 / B4=1.06.

[0018] The application further provides a large-flow water cannon structure comprising a U-shaped bent pipe and a plurality of 90-degree bent pipes, and the special feature is that:

[0019] The 90-degree bent pipe adopts the above-mentioned 90-degree bent pipe.

[0020] The U-shaped bent pipe adopts the above-mentioned U-shaped bent pipe.

[0021] Further, a cannon head and a flow regulator coaxially arranged in the cannon head are further included.

[0022] The flow regulator is a plane on the side close to the rear end of the cannon head and has a three-layer stepped structure from inside to outside on the side close to the front end of the cannon head.

[0023] Further, the flow channel in the flow regulator is a square grid flow channel.

[0024] The application has the following beneficial effects:

[0025] 1. In the application, the first thickening part is arranged on the inner side wall of the inner bend of the 90-degree elbow body, connects the two ends of the inner bend, and has a crescent structure in the axial section, which reduces the high curvature of the inner side area of the 90-degree elbow body. The higher the curvature, the greater the energy loss. Therefore, the design in the application can reduce the high energy loss of the inner side area of the 90-degree elbow body. Secondly, when the fluid flows along the axial direction of the 90-degree elbow body, due to the centrifugal force of the curved pipe, the pressure on the outer side of the pipe is greater than that on the inner side, and the flow velocity at the inner side wall of the inner bend is higher than that at the inner side wall of the outer bend. Under the action of the transverse pressure difference between the inner and outer walls, a secondary flow perpendicular to the main flow axis direction appears on the cross section of the elbow along the side wall. The water flow flows transversely from the inner wall to the outer wall. The design in the application reduces the difference in centrifugal force between the inner bend and the outer bend, reduces the cross flow, improves the flow turbulence and energy loss caused by the large cross flow, and improves the water cannon range.

[0026] 2. In the application, the first circular arc guide plate / second circular arc guide plate adopts the same design, further fills the space where turbulence occurs, further improves the fluid flow state, reduces energy loss, and improves the water cannon range.

[0027] 3. In the application, in view of the phenomenon that the flow velocity of fluid is large in the middle of the pipe and small at the edge, the structure of the flow regulator is specially designed. The flow channels of the previous flow regulator are designed to have equal length, while the flow regulator is designed as a three-layer stepped flow structure. The first layer center flow channel is designed to be the longest, the second layer middle flow channel is designed to be the second longest, and the edge flow channel is designed to be the shortest. The flow channel of the flow regulator adopts a square structure. Firstly, the length of the flow channel from the center to the edge is optimized according to the fluid flow characteristics. By lengthening the middle flow channel, the flow regulating effect of the high-speed fluid area is strengthened to achieve better flow regulating effect. Reducing the length of the flow channel in the low-speed fluid area at the edge can also achieve the same flow regulating effect, avoiding the pressure loss along the flow channel caused by the excessive length of the flow channel at the edge. Secondly, the uneven flow velocity distribution is improved. The longer the flow channel, the greater the energy loss, which also leads to a decrease in local flow velocity. The flow regulator with different lengths of inner and outer flow channels is beneficial to improving the flow velocity difference between the middle flow channel and the edge flow channel, and further reducing the turbulence degree. Thirdly, the square grid structure has better effect than the circular grid structure in inhibiting swirl, and can achieve better flow regulating effect.

[0028] 4、In the application, through the unique structure design of the 90-degree elbow pipe, the U-shaped elbow pipe inner wall, the first circular arc guide plate and the second circular arc guide plate in the large-flow water cannon structure, and the unique structure design of the rectifier, the generation of turbulence is further inhibited, the energy loss is reduced, the fluid flow state in the cannon is improved, and the water cannon range is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the perspective structural schematic diagram of the 90-degree elbow pipe embodiment of the application;

[0030] Figure 2 is the structural schematic diagram of the first thickening part and the second thickening part in the 90-degree elbow pipe embodiment of the application;

[0031] Figure 3 is the sectional view schematic diagram of the 90-degree elbow pipe embodiment of the application;

[0032] Figure 4 is the perspective structural schematic diagram of the U-shaped elbow pipe embodiment of the application;

[0033] Figure 5 is the structural schematic diagram of the third thickening part and the fourth thickening part in the U-shaped elbow pipe embodiment of the application;

[0034] Figure 6 is the sectional view schematic diagram of the U-shaped elbow pipe embodiment of the application;

[0035] Figure 7 is the perspective structural schematic diagram of the large-flow water cannon structure embodiment of the application;

[0036] Figure 8 is the perspective structural schematic diagram of the rectifier in the large-flow water cannon structure embodiment of the application.

[0037] In the figure, 1, inlet pipe; 2, horizontal rotation structure; 3, first 90-degree elbow pipe; 4, first circular arc guide plate; 5, vertical rotation structure; 6, U-shaped elbow pipe; 7, second 90-degree elbow pipe; 8, cannon head; 9, rectifier; 10, 90-degree elbow pipe body; 11, U-shaped elbow pipe body; 12, second circular arc guide plate; 13, flat guide plate; 14, second straight pipe; 15, third 90-degree elbow pipe; 16, third straight pipe; 17, fourth 90-degree elbow pipe, 18, first straight pipe; 19, inner elbow pipe inner wall; 20, first circular arc guide plate inner wall; 21, U-shaped inner elbow pipe inner wall; 22, second circular arc guide plate inner wall. DETAILED DESCRIPTION

[0038] The application will be described in detail below in combination with the drawings and specific embodiments.

[0039] The existing 90-degree elbow pipe, the inner elbow pipe and the outer elbow pipe have the same wall thickness, and when applied in a large-flow water cannon structure, a large flow velocity difference is caused due to the influence of the curvature radius, the fluid generates cross flow in the curved pipe under the action of the centrifugal force, and vortex is formed in the pipe under the action of the pipe wall, which causes energy loss and increases the turbulence degree, the vortex area continues from the elbow pipe to the cannon head 8, which has a continuous adverse effect, the turbulence degree of the water flow at the nozzle outlet of the cannon head 8 is still high, the range is reduced, and in the cannon head 8, the flow velocity of the fluid in the middle is greater than that of the fluid at the edge, and the flow channel of the traditional flow straightener has the same length from the central axis to the edge, which causes unnecessary energy loss, and finally affects the improvement of the jet flow of the water cannon.

[0040] In order to solve the above problems:

[0041] In the application, the thickening piece is arranged on the inner side wall of the elbow pipe for different elbow pipe inner diameters and liquid flow velocities, and the diameter of the thickening piece has a corresponding relationship with the size of the elbow pipe, so as to improve the problem that the liquid flow state is poor in the area near the inner side of the elbow pipe due to high curvature.

[0042] The thickening piece is also arranged on the flow guide plate for different outer curvature radii of the flow guide plate and liquid flow velocities, and the diameter of the thickening piece has a corresponding relationship with the size of the flow guide plate, so as to improve the problem that the liquid flow state is poor in the area near the outer side of the flow guide plate due to high curvature.

[0043] Specifically:

[0044] The application provides a 90-degree elbow pipe for a water cannon structure, which comprises a 90-degree elbow pipe body 10, and compared with a conventional elbow pipe with the same wall thickness structure, the inner side wall of the inner elbow pipe of the 90-degree elbow pipe body 10 is modified, and specifically: Figure 1 As shown in Figure 3 The 90-degree elbow pipe body 10 comprises an inner elbow pipe and an outer elbow pipe, the inner side wall 19 of the inner elbow pipe is provided with a first thickening piece connected to both ends of the inner elbow pipe and having a crescent structure in the axial section, the first thickening piece is a spherical curved surface structure away from the center O1 of the inner elbow pipe, is matched with the inner side wall 19 of the inner elbow pipe close to the center O1 of the inner elbow pipe, the center O2 of the spherical curved surface of the first thickening piece is located on the 45-degree bisector of the 90-degree elbow pipe, and on the 45-degree bisector, the first thickening piece and the inner elbow pipe satisfy the following relationship: 1

[0045] A / B≤1.1;wherein, A represents the distance from the spherical surface of the first thickening part to the center O1 of the inner bend pipe, and B represents the distance from the inner side wall 19 of the inner bend pipe to the center O1 of the inner bend pipe, if the first thickening part and the inner side wall of the inner bend pipe are regarded as a whole, the wall thickness of the inner side wall 19 of the inner bend pipe gradually increases from both ends to the middle, that is, the present application changes the radius of curvature of the region near the inner side wall 19 of the 90-degree bend pipe body 10, and the region with high curvature near the inner side wall 19 of the inner bend pipe is filled and thickened to a position with lower curvature, in the present embodiment, on the 45-degree bisector, the radius of the inner side wall of the inner bend pipe is 150 mm, and the distance from the first thickening part to the center O1 of the inner bend pipe is 165 mm, since the two ends of the first thickening part are connected to the two ends of the inner side wall of the inner bend pipe and are copointed, the radius of the inner side wall of the inner bend pipe increases from 150 mm to 165 mm, and the curvature changes in the range from 1 / 150 to 1 / 165, the improvement has the advantages of improving the problem of poor liquid flow state caused by high curvature 1 / 150 in the region near the inner wall side of the conventional pipe (reducing the distribution of fluid flow in the R150 to R165 region, and further reducing the state of flow disorder).

[0046] In order to better reduce energy loss, a first circular arc flow guide plate 4 is arranged in the middle of the 90-degree bend pipe body 10 along the axial direction of the 90-degree bend pipe body 10, the center of the middle split surface of the first circular arc flow guide plate 4 along the axial direction of the 90-degree bend pipe body 10 is concentric with the center O1 of the inner bend pipe; the two side walls of the first circular arc flow guide plate 4 are connected with the inner wall of the 90-degree bend pipe body 10, compared with the conventional flow guide plate with equal wall thickness structure, such as Figure 2 And Figure 3As shown, the first arc-shaped flow guide plate 4 is provided with a second thickening part connected to both ends of the first arc-shaped flow guide plate 4 and having a crescent structure in the axial section, the second thickening part is a spherical curved surface structure away from the inner bend pipe center O1, and is matched with the first arc-shaped flow guide plate 4 near the inner bend pipe center O1, the center O3 of the spherical curved surface of the second thickening part is located on the 45-degree bisector of the 90-degree elbow pipe body 10, and on the 45-degree bisector, the second thickening part and the first arc-shaped flow guide plate 4 satisfy the following relationship: 1

[0047] The application further provides a U-shaped elbow pipe, as shown in Figure 4 、 Figure 5 and Figure 6 The U-shaped elbow pipe body 11 has an equal wall thickness structure of a conventional U-shaped elbow pipe, and the same method as described above is used to gradually increase the inner wall thickness of the U-shaped inner bend pipe of the U-shaped elbow pipe body 11 from both ends to the middle, in this embodiment, the curvature radius of the inner wall near the region gradually increases from 150 mm at both ends to 160 mm in the middle, and the curvature decreases from 1 / 150 to 1 / 160, thereby improving the problem of poor liquid flow state caused by the higher curvature 1 / 150 of the conventional pipe inner wall side near the region.

[0048] To further reduce energy loss, a second arc-shaped guide plate 12 is also included, located in the middle of the U-shaped bend body 11 along the axial direction. The center of the midpoint of the second arc-shaped guide plate 12 along the axial direction of the U-shaped bend body 11 is concentric with the center O4 of the inner U-shaped bend. The two side walls of the second arc-shaped guide plate 12 are connected to the inner wall of the U-shaped bend body 11. Compared with conventional guide plates with the same wall thickness, the same method is used to ensure that the inner side of the second arc-shaped guide plate 12 near the inner bend is under the same curvature, that is, the inner wall of the second arc-shaped guide plate 12 is coaxially set with the U-shaped bend body 11. The wall thickness on the outer side away from the inner bend gradually increases from both ends to the middle, the radius of curvature gradually increases from 302mm to 320mm, and the curvature decreases from 1 / 302 to 1 / 320. This improves the problem of poor liquid flow caused by the high curvature of 1 / 302 in the area near the outer side of conventional guide plates.

[0049] Based on the aforementioned 90-degree bend and U-shaped bend 6, this invention also proposes a high-flow-rate water cannon structure, such as... Figure 7 As shown, it includes, in sequence, an inlet pipe 1, a horizontal rotating structure 2, a first 90-degree bend 3, a vertical rotating structure 5, a U-shaped bend 6, a first straight pipe 18, a second 90-degree bend 7, a second straight pipe 14, a third 90-degree bend 15, a third straight pipe 16, a fourth 90-degree bend 17, and a cannon head 8 connected to the flange of the fourth 90-degree bend 17.

[0050] A rectifier 9 is coaxially mounted inside the gun head 8, such as... Figure 8 As shown, the rectifier 9 is composed of multiple square grid channels; among them, the middle square grid channel is the longest and is the first layer. The length of the multiple square grid channels surrounding the middle one is shorter than that of the first layer, and the length of the multiple square grid channels surrounding the second layer is shorter than that of the second layer. Thus, the rectifier 9 forms a three-layer stepped structure with a flat surface on the side near the arc-shaped pipe and a three-layer stepped structure from the inside to the outside on the other end.

[0051] The first straight pipe 18, the second straight pipe 14, and the third straight pipe 16 are all provided with flat guide plates 13 in the middle along their circumference to further improve the flow state, reduce the degree of turbulence, and improve the jet concentration and range.

[0052] By optimizing the 90-degree bend, U-shaped bend, guide plate, and rectifier structure, the water cannon jet's focusing ability was improved, resulting in a 5% decrease in turbulence intensity at the outlet. The range increased from 180 meters to 193 meters. Further optimization of the curvature variation range of the inner wall of the bend and the guide plate, as well as the flow channel length of the rectifier, could further improve the jet's focusing ability and range.

Claims

1. A 90-degree bend for a water cannon structure, comprising a 90-degree bend body (10), the 90-degree bend body (10) being composed of an inner bend and an outer bend, characterized in that: The inner wall (19) of the inner bend is provided with a first thickening member that connects the two ends of the inner bend and has a crescent-shaped axial section. The side of the first thickening member away from the center O1 of the inner bend is a spherical curved surface structure, and the side closer to the center O1 of the inner bend is adapted to the inner wall (19) of the inner bend. The center O2 of the spherical curved surface of the first thickening member is located on the 45-degree bisector of the 90-degree bend. On the 45-degree bisector, the first thickening member and the inner bend satisfy the following relationship: 1 < A / B ≤ 1.1; where A represents the distance from the spherical curved surface of the first thickening member to the center O1 of the inner bend, and B represents the distance from the inner wall (19) of the inner bend to the center O1 of the inner bend. It also includes a first arc-shaped guide plate (4) arranged in the middle of the 90-degree bend body (10) along the axial direction of the 90-degree bend body (10). The center of the midpoint of the first arc-shaped guide plate (4) along the axial direction of the 90-degree bend body (10) is concentric with the center of the inner bend body (11). The two side walls of the first arc-shaped guide plate (4) are connected to the inner wall of the 90-degree bend body (10). The first arc-shaped guide plate (4) is provided with a second thickening member on the side away from the first thickening member, which connects the two ends of the first arc-shaped guide plate (4) and has a crescent-shaped axial section. The side of the second thickening member away from the center O1 of the inner bend is a spherical curved surface structure, and the side close to the center O1 of the inner bend is adapted to the first arc-shaped guide plate (4). The center O3 of the spherical curved surface of the second thickening member is located on the 45-degree bisector of the 90-degree bend body (10). On the 45-degree bisector, the second thickening member and the first arc-shaped guide plate (4) satisfy the following relationship: 1 < A1 / B1 ≤ 1.1; where A1 represents the distance from the spherical curved surface of the second thickening member to the center O1 of the inner bend, and B1 represents the distance from the inner wall (20) of the first arc-shaped guide plate to the center O1 of the inner bend.

2. The 90-degree bend in the water cannon structure according to claim 1, characterized in that: In the first thickened component, A / B = 1.1; In the second thickened part, A1 / B1 = 1.

07.

3. A U-shaped bend for a water cannon structure, comprising a U-shaped bend body (11), the U-shaped bend body (11) comprising an inner U-shaped bend and an outer U-shaped bend, characterized in that: The inner wall (21) of the U-shaped inner bend is provided with a third thickening member that connects the two ends of the U-shaped inner bend and has a crescent-shaped axial section. The side of the third thickening member away from the center O4 of the U-shaped inner bend is a spherical curved surface structure, and the side close to the center O4 of the U-shaped inner bend is adapted to the inner wall (21) of the U-shaped inner bend. The center O5 of the spherical curved surface of the third thickening member is located on the 90-degree bisector of the U-shaped inner bend. On the 90-degree bisector, the third thickening member and the U-shaped inner bend satisfy the following relationship: 1 < A3 / B3 ≤ 1.1; where A3 represents the distance from the third thickening member to the center O4 of the U-shaped inner bend, and B3 represents the distance from the inner wall (21) of the U-shaped inner bend to the center O4 of the U-shaped inner bend.

4. The U-shaped bend for a water cannon structure according to claim 3, characterized in that: It also includes a second arc-shaped guide plate (12) arranged in the middle of the U-shaped bend body (11) along the axial direction of the U-shaped bend body (11). The center of the midpoint of the second arc-shaped guide plate (12) along the axial direction of the U-shaped bend body (11) is concentric with the center O4 of the inner U-shaped bend. The two side walls of the second arc-shaped guide plate (12) are connected to the inner wall of the U-shaped bend body (11). The second arc-shaped guide plate (12) is provided with a fourth thickening member on the side away from the third thickening member, which connects the two ends of the second arc-shaped guide plate (12) and has a crescent-shaped axial section. The side of the fourth thickening member away from the center O4 of the U-shaped inner bend is a spherical curved surface structure, and the side close to the center O4 of the U-shaped inner bend is adapted to the second arc-shaped guide plate (12). The center O6 of the spherical curved surface of the fourth thickening member is located on the 90-degree bisector of the U-shaped bend body (11). On the 90-degree bisector, the fourth thickening member and the second arc-shaped guide plate (12) satisfy the following relationship: 1 < A4 / B4 ≤ 1.1; where A4 represents the distance from the spherical curved surface of the fourth thickening member to the center O4 of the U-shaped inner bend, and B4 represents the distance from the inner wall (22) of the second arc-shaped guide plate to the center O4 of the U-shaped inner bend.

5. The U-shaped bend for a water cannon structure according to claim 4, characterized in that: In the third thickening component, A3 / B3 = 1.07; In the fourth thickening component, A4 / B4 = 1.

06.

6. A high-flow-rate water cannon structure, comprising a U-shaped bend and multiple 90-degree bends, characterized in that: The 90-degree bend is the 90-degree bend described in any one of claims 1-2; The U-shaped bend is the U-shaped bend described in any one of claims 3-5.

7. The high-flow-rate water cannon structure according to claim 6, characterized in that: It also includes a gun head (8) and a rectifier (9) coaxially disposed inside the gun head (8); The rectifier (9) is flat on the side near the rear end of the gun head (8), and has a three-layer stepped structure from the inside to the outside on the side near the front end of the gun head (8).

8. The high-flow-rate water cannon structure according to claim 7, characterized in that: The flow channel in the rectifier (9) is a square grid flow channel.

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