Bent pipe water cannon with despinning function

Abstract

The invention belongs to the field of fire water monitors, and particularly relates to an elbow water monitor with a despinning function. The invention provides an elbow water cannon with a despinning function, which comprises a straight pipe part with one end provided with a nozzle outlet section and an elbow part with one end communicated with the other end of the straight pipe part and the other end provided with a water inlet, the straight pipe part is provided with a rectifier with an inner wing structure, and the elbow part is 6-shaped as a whole and comprises an elbow outlet straight section, an elbow outlet straight section and an elbow outlet straight section, a first bent section of the bent pipe; the bent pipe is a first straight section; the bent pipe is a second bent section; the bent pipe is a second straight section; a third bent section of the bent pipe; a fourth bent section of the bent pipe; and a bent pipe inlet straight section. According to the elbow water cannon with the rotation elimination function, on the premise that the rectification effect is not affected, the total length of the rotation elimination piece is effectively shortened, flowing pressure loss is reduced, and the rotation elimination rectification effect, power loss and vortex flux are comprehensively optimal.

Description

Technical Field

[0001] This invention belongs to the field of fire monitors, specifically relating to a curved water monitor with anti-swirl function. Background Technology

[0002] As a fluid jetting device that combines civilian firefighting and non-lethal defense functions, the core performance requirements of water cannons focus on jet stability, long-range coverage, and low energy efficiency: In firefighting scenarios, it is necessary to ensure that the high-pressure jet is continuously concentrated and to avoid jet dispersion caused by fluid rotation in order to meet the long-distance firefighting needs of high-rise and large-space buildings; in naval rights protection scenarios, it is necessary to control recoil while ensuring jet range and strike accuracy to support non-lethal expulsion missions; in industrial and municipal scenarios, it is necessary to balance jet coverage and power consumption to avoid energy waste caused by flow loss.

[0003] Among the aforementioned requirements, the deswirl rectification structure is a key component that determines the performance of the water cannon. During the flow of fluid through the bends, straight pipes, and other flow passage components of the water cannon, rotating vortices are easily generated due to the flow channel turning. The deswirl rectification structure can eliminate such vortices by guiding the fluid's movement trajectory, optimizing the nozzle velocity distribution, and directly affecting the jet range, concentration, and recoil control, thus playing a decisive role in the core performance of the water cannon.

[0004] The current mainstream water cannon deswirl structure is mainly based on multi-blade deswirl vanes, which guide the direction of the fluid through the vanes to eliminate eddies. However, this technology faces three major contradictions in practical applications, making it difficult to achieve comprehensive performance.

[0005] First, there is a contradiction between the deswirl rectification effect and structural adaptability. To fully eliminate eddies, existing designs often extend the axial length of the deswirl vanes. While this can improve the rectification effect, it increases the overall size and weight of the water cannon, which is not conducive to a compact layout in naval scenarios and appears even more cumbersome in portable firefighting equipment. At the same time, the fluid stays in the area of ​​the long deswirl vanes for a longer time, which can easily induce local turbulence and thus damage the stability of the subsequent jet, contradicting the requirement for long range.

[0006] Secondly, there is a cascading contradiction between flow pressure loss, energy consumption, and recoil. Existing deswirl vanes mostly adopt an equally spaced and equally angled blade layout, resulting in a large contact area between the blades and the fluid, which significantly increases flow resistance. Excessive pressure loss not only requires additional power compensation from the pump unit, causing energy waste, but may also indirectly increase the recoil of the water cannon, affecting the operational stability of equipment in scenarios such as ships. Long-term use further increases operating costs, which does not meet the requirements of energy conservation and safety.

[0007] Finally, there is the imbalance between vortex flux control and overall performance. Existing technologies mostly focus on the single objective of vortex elimination, neglecting the correlation between vortex flux and jet performance and energy consumption. Some designs reduce the number of blades or shorten their length to reduce drag, but residual vortex flux can cause jet wobbling during injection, resulting in the range not meeting design expectations. Other designs excessively densify blades to pursue low vortex flux, which, while eliminating vortices, further increases pressure loss, creating an imbalance of low vortex flux and high energy consumption.

[0008] In summary, existing water cannon deswirl rectification technology faces a multi-objective optimization dilemma: it cannot simultaneously ensure deswirl effectiveness and structural compactness; it is difficult to limit residual vortex flux to a range that does not affect jet performance while reducing pressure loss and controlling energy consumption; and it lacks a systematic optimization scheme for deswirl effectiveness, structural dimensions, energy consumption, and vortex flux. Therefore, developing a deswirl rectification structure that overcomes these contradictions and achieves optimal comprehensive performance across multiple indicators is crucial for upgrading water cannon technology. This is of great significance for improving the applicability of water cannons in firefighting and naval scenarios, reducing energy consumption throughout their life cycle, and optimizing jet performance. Summary of the Invention

[0009] The present invention provides a curved water cannon with anti-swirl function, which can effectively solve the problems in the background art.

[0010] This invention provides a curved water cannon with anti-swirl function, comprising a straight pipe section with a nozzle outlet at one end, and a curved pipe section with one end connected to the other end of the straight pipe section and the other end serving as a water inlet. The straight pipe section is equipped with a flow rectifier with an inner wing structure, and the curved pipe section is generally shaped like a "6".

[0011] The straight section of the bend outlet connects to the other end of the straight pipe section;

[0012] The first bend of the bend, which connects to the straight section of the bend outlet;

[0013] The first straight section of the bend that connects to the first bend of the bend;

[0014] The second bend of the bend, which is connected to the first straight section of the bend;

[0015] The second straight section of the bend that connects to the second bend of the bend;

[0016] The third bend of the bend, which connects to the second straight section of the bend;

[0017] The fourth bend of the pipe that connects to the third bend of the pipe;

[0018] And, the straight section of the inlet of the bend that is connected to the fourth bend of the bend, the end face of the straight section of the inlet of the bend is perpendicular to its length direction;

[0019] The centerlines of the straight section of the bend outlet, the first bend section of the bend, the first straight section of the bend, the second bend section of the bend, the second straight section of the bend, and the straight section are all coplanar to form a first plane, and the first plane forms an angle of -60° to +75° with the end face of the straight section of the bend inlet.

[0020] The plane containing the centerline of the third bend of the pipe is the second plane, and the second plane forms a 45° angle with the end face of the straight section of the pipe inlet.

[0021] The plane containing the centerline of the fourth bend of the pipe is the third plane, which is perpendicular to the end face of the straight section of the pipe inlet.

[0022] It also includes a despinning plate located inside the second bend of the bend and perpendicular to the first plane. The despinning plate bends along the length of the second bend of the bend to divide the second bend of the bend into two halves.

[0023] As a further optimization of the present invention, the curvature and length of the anti-swirl plate are the same as those of the second section of the bend.

[0024] As a further optimization of the present invention, the straight pipe section includes:

[0025] A straight nozzle exit section;

[0026] A frustum-shaped nozzle section with a small diameter end connected to the nozzle outlet section, the length of which is 1.2 times its diameter.

[0027] The first straight section of the straight pipe connecting the large-diameter end of the nozzle section has a length three times its inner diameter.

[0028] And, the contraction section that connects the small-diameter end to the first straight section of the straight pipe and the large-diameter end to the straight section of the bend outlet.

[0029] As a further optimization of the present invention, the cone angle of the nozzle section is 13°-14°.

[0030] As a further optimization of the present invention, the side of the contraction section adopts a Widosinski curve structure with a contraction angle of 30°-33°.

[0031] As a further optimization of the present invention, the nozzle outlet section diameter... Satisfy the following functional relationship:

[0032]

[0033] In the formula, The flow rate at the nozzle outlet section is in mm. The velocity coefficient m of the nozzle section 3 / h, with a value ranging from 0.9 to 0.96; The acceleration due to gravity is taken as 9.91 m / s². 2 ; Work pressure, in kPa.

[0034] As a further optimization of the present invention, the rectifier includes six parallelogram-shaped ribs, which are fixed in a ring array to the inner wall of the first straight section of the straight pipe. The acute-angled end of the edge connecting the ribs to the inner wall of the first straight section of the straight pipe is located at the junction of the first straight section and the contraction section of the straight pipe, and the obtuse-angled end of the edge faces the nozzle outlet section.

[0035] As a further optimization of the present invention, the length of the rib plate in the radial direction along the first straight segment of the straight pipe is 0.3 times the diameter of the first straight segment of the straight pipe; the length of the rib plate in the length direction along the first straight segment of the straight pipe is the same as the diameter of the first straight segment of the straight pipe; and the obtuse angle end of the rib plate is 140°.

[0036] As a further optimization of the present invention, the central angle of the first bend of the pipe is 35°, the central angle of the second bend of the pipe is 125°, the central angle of the third bend of the pipe is 180°, and the central angle of the fourth bend of the pipe is 90°.

[0037] As a further optimization of the present invention, the anti-swirl plate is offset from the center of the second bend of the bend by 10% of the diameter of the second bend.

[0038] The present invention provides a curved water cannon with deswirl function, which determines the specific component structure type and optimal structural parameters suitable for the water cannon structure, and can effectively reduce the flow loss and outlet turbulent kinetic energy and vortex intensity in the water cannon, improve the flow energy conversion efficiency and the uniformity and stability of the outlet jet, thereby effectively increasing the range of the water cannon. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the front structure of this embodiment;

[0040] Figure 2 This is a side view of the structure in this embodiment;

[0041] Figure 3 This is a schematic diagram of the internal structure of the straight pipe section after longitudinal sectioning in this embodiment;

[0042] Figure 4 This is a schematic diagram of the internal structure of the straight pipe section after transverse sectioning in this embodiment;

[0043] Figure 5 This is a schematic diagram of the structure after partial cross-section of the bend in this embodiment. Figure 1 ;

[0044] Figure 6 This is a schematic diagram of the structure after partial cross-section of the bend in this embodiment. Figure 2 ;

[0045] Among them, the straight pipe section 1, nozzle outlet section 1a, nozzle section 1b, first straight section of straight pipe 1c, contraction section 1d, bend pipe section 2, straight section of bend pipe outlet 2a, first bend section of bend pipe 2b, first straight section of bend pipe 2c, second bend section of bend pipe 2d, second straight section of bend pipe 2e, third bend section of bend pipe 2f, fourth bend section of bend pipe 2g, straight section of bend pipe inlet 2h, rib plate 3, and anti-swirl plate 4. Detailed Implementation

[0046] like Figure 1-6 As shown, this embodiment includes a straight pipe section 1 and a bent pipe section 2.

[0047] One end of the straight pipe section 1 is provided with a nozzle outlet section 1a as a nozzle for spraying water outward. One end of the bent pipe section 2 is connected to the other end of the straight pipe section 1, and the other end of the bent pipe section 2 is a water inlet.

[0048] The straight section 1 is equipped with a rectifier with an inner wing structure.

[0049] Preferably, in this embodiment, the rectifier includes six parallelogram-shaped ribs 3, which are fixed in a ring array on the inner wall of the first straight section 1c of the straight pipe. The acute-angled end of the side line connecting the rib 3 and the first straight section 1c of the straight pipe is located at the junction of the first straight section 1c and the contraction section 1d of the straight pipe, and the obtuse-angled end of the side line of the rib 3 faces the nozzle outlet section 1a.

[0050] Preferably, the length of rib 3 along the radial direction of the first straight segment 1c of the straight pipe, i.e., the height of rib 3, is 0.3 times the diameter of the first straight segment 1c of the straight pipe; the length of rib 3 along the length direction of the first straight segment 1c of the straight pipe, i.e., the length of rib 3, is the same as the diameter of the first straight segment 1c of the straight pipe; the obtuse angle end of rib 3 is 140°.

[0051] In this embodiment, the bend section 2 is composed of several straight and bend sections of pipe connected in series. Specifically, it includes a straight section 2a at the outlet of the bend, a first bend section 2b, a first straight section 2c, a second bend section 2d, a second straight section 2e, a third bend section 2f, a fourth bend section 2g, and a straight section 2h at the inlet of the bend, forming an overall "6"-shaped structure.

[0052] One end of the straight section 2a at the outlet of the bend is connected to the other end of the straight section 1, and the other end of the straight section 2a at the outlet of the bend is connected to one end of the first bend section 2b of the bend.

[0053] One end of the first straight section 2c of the bend is connected to the other end of the first bend section 2b of the bend, and the other end of the first straight section 2c of the bend is connected to one end of the second bend section 2d of the bend.

[0054] Preferably, the central angle of the first bend 2b of the bend is 35°.

[0055] The bending direction of the second bend 2d of the bend is completely opposite to the bending direction of the first bend 2b of the bend.

[0056] Preferably, the central angle of the second bend 2d of the pipe is 125°.

[0057] One end of the second straight section 2e of the bend is connected to the second bend section 2d of the bend, and the other end of the second straight section 2e of the bend is connected to one end of the third bend section 2f of the bend.

[0058] The center lines of the straight section 2a of the bend outlet, the first bend section 2b of the bend, the first straight section 2c of the bend, the second bend section 2d of the bend, the second straight section 2e of the bend, and the straight section 1 are all on the same plane, which is the first plane.

[0059] The centerline of the third bend 2f of the pipe also forms a plane, which is the second plane.

[0060] Preferably, the central angle of the third bend 2f of the bend is 180°.

[0061] One end of the fourth bend section 2g of the bend is connected to the other end of the third bend section of the bend, and the other end of the fourth bend section 2g of the bend is connected to one end of the straight section 2h at the inlet of the bend.

[0062] Preferably, the central angle of the fourth bend of the pipe is 90°.

[0063] The center lines of the fourth bend section 2g and the straight section 2h at the inlet of the bend are on the same plane, which is the third plane.

[0064] In this embodiment, the end face of the straight section 2h at the inlet of the bend is perpendicular to its length direction. Taking the end face of the straight section 2h at the inlet of the bend as the reference plane, the third plane is perpendicular to the reference plane, the second plane forms a 45° angle with the reference plane, and the first plane forms a 30° angle with the reference plane. At this time, the range reaches the maximum. In practical applications, the pitch angle can be adjusted by using a worm gear structure as needed. The pitch angle range is generally between -60° and +75°.

[0065] In this embodiment, a despinning plate 4 perpendicular to the first plane is provided in the second bend 2d of the bend. The despinning plate 4 is bent into an arc shape along the length of the second bend 2d of the bend, and the despinning plate 4 divides the second bend 2d into two halves.

[0066] Preferably, the curvature and length of the anti-swirl plate 4 are the same as those of the second section of the bend.

[0067] Preferably, the deswirl plate 4 is not located at the center plane of the second bend 2d of the bend, but is offset by 10% of the diameter of the second bend towards the arc center of the second bend 2d. Numerical experiments show that when this value is taken, the combined effect of jet pressure loss and turbulent kinetic energy at the water cannon outlet is optimal.

[0068] Preferably, in this embodiment, the straight pipe section 1 includes a nozzle outlet section 1a, a nozzle section 1b, a first straight section 1c, and a contraction section 1d.

[0069] The nozzle outlet section 1a is straight.

[0070] Nozzle section 1b is frustum-shaped. The small-diameter section of nozzle section 1b is connected to nozzle outlet section 1a, and the large-diameter end of nozzle section 1b is connected to one end of the first straight section 1c of the straight pipe. The length of the first straight section 1c of the straight pipe is three times its inner diameter.

[0071] The contraction section 1d adopts a structure with a Vidosinski curve on the side. The small-diameter end of the contraction section 1d is connected to the other end of the first straight section 1c of the straight pipe, and the large-diameter end of the contraction section 1d is connected to one end of the straight section 2a of the bend outlet. The contraction angle of the contraction section 1d is 30°-33°.

[0072] Preferably, in this embodiment, the cone angle of nozzle section 1b is 13°-14°, and the length of nozzle section 1b is 1.2 times its diameter. When the nozzle contraction angle is 13°-14°, the jet energy loss is small and the flow coefficient is maximum.

[0073] Preferably, in this embodiment, the diameter of the nozzle outlet section 1a is... Satisfy the following functional relationship:

[0074]

[0075] In the formula, The flow rate at nozzle outlet section 1a is in mm. The velocity coefficient for nozzle section 1b is m³ / h, with a value ranging from 0.9 to 0.96. The acceleration due to gravity is taken as 9.91 m / s². Work pressure, in kPa.

[0076] It should be understood that the descriptions of directions or positional relationships such as up, down, left, right, front, back, top, bottom, tail, horizontal, and vertical in this application are all based on the accompanying drawings and are only used to more clearly express the technical solution and simplify the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A rotary water cannon with a function of canceling the rotation, comprising a straight pipe section provided with a nozzle outlet section at one end, and a curved pipe section having one end communicated with the other end of the straight pipe section and the other end as a water inlet, the straight pipe section being provided with a rectifier of inner wing structure, characterized in that, The whole of the elbow pipe section is in the shape of a "6", comprising: an elbow pipe outlet straight section in communication with the other end of the straight pipe section; an elbow pipe first bend section in communication with the elbow pipe outlet straight section; an elbow pipe first straight section in communication with the elbow pipe first bend section; an elbow pipe second bend section in communication with the elbow pipe first straight section; an elbow pipe second straight section in communication with the elbow pipe second bend section; an elbow pipe third bend section in communication with the elbow pipe second straight section; an elbow pipe fourth bend section in communication with the elbow pipe third bend section; and an elbow pipe inlet straight section in communication with the elbow pipe fourth bend section, the end surface of the elbow pipe inlet straight section being perpendicular to the length direction thereof. The center lines of the elbow pipe outlet straight section, the elbow pipe first bend section, the elbow pipe first straight section, the elbow pipe second bend section, the elbow pipe second straight section and the straight pipe section are coplanar to form a first plane, the first plane and the end surface of the elbow pipe inlet straight section forming an included angle of -60° to +75°. The plane in which the center line of the elbow pipe third bend section lies is a second plane, the second plane and the end surface of the elbow pipe inlet straight section forming an included angle of 45°. The plane in which the center line of the elbow pipe fourth bend section lies is a third plane, the third plane being perpendicular to the end surface of the elbow pipe inlet straight section. Further comprising a despinning sheet arranged in the elbow pipe second bend section and perpendicular to the first plane, the despinning sheet being curved along the length direction of the elbow pipe second bend section to divide the elbow pipe second bend section into two halves.

2. A bend pipe water cannon with a function of canceling rotation according to claim 1, wherein The curvature and length of the despinning sheet are the same as those of the elbow pipe second section.

3. A bend pipe water cannon with a function of canceling rotation according to claim 1, wherein The straight pipe section comprises: a nozzle outlet section in a straight shape, the length of the nozzle outlet section being 1.2 times the diameter thereof; a nozzle section in the shape of a circular truncated cone and in communication with the nozzle outlet section at the small-diameter end thereof; a straight pipe first straight section in communication with the large-diameter end of the nozzle section, the length of the straight pipe first straight section being 3 times the inner diameter thereof; a contraction section in communication with the small-diameter end of the straight pipe first straight section and with the elbow pipe outlet straight section at the large-diameter end thereof.

4. A bend pipe water cannon with a function of canceling rotation according to claim 3, wherein The taper angle of the nozzle section is 13°-14°.

5. A bend pipe water cannon with a function of canceling rotation according to claim 3, wherein The side surface of the contraction section adopts a Vodoussinsky curve structure, and the contraction angle is 30°-33°.

6. A bend pipe water cannon with a function of canceling rotation according to claim 3, wherein Nozzle exit section diameter satisfies the following functional relationship: In the formula, is the nozzle outlet section flow, unit mm; is the nozzle section flow rate coefficient m 3 / h, the value is 0.9-0.96; is the acceleration of gravity, the value is 9.91 m / s 2 ; is the working pressure, unit kPa.

7. A bend pipe water cannon with a function of canceling rotation according to claim 1, wherein The rectifier comprises six parallelogram-shaped rib plates, which are fixed in an annular array on the inner wall of the straight pipe first straight section, the acute-angle end of the side line connecting the rib plate and the inner wall of the straight pipe first straight section being located at the junction of the straight pipe first straight section and the contraction section, and the obtuse-angle end of the side line being directed toward the nozzle outlet section.

8. A bend pipe water cannon with a function of canceling rotation according to claim 7, wherein The length of the rib plate along the diameter direction of the straight pipe first straight section is 0.3 times the diameter of the straight pipe first straight section, the length of the rib plate along the length direction of the straight pipe first straight section is the same as the diameter of the straight pipe first straight section, and the obtuse-angle end of the rib plate is 140°.

9. A bend pipe water cannon with a function of canceling rotation according to claim 1, wherein The central angle of the elbow pipe first bend section is 35°, the central angle of the elbow pipe second bend section is 125°, the central angle of the elbow pipe third bend section is 180°, and the central angle of the elbow pipe fourth bend section is 90°.

10. A bend pipe water cannon with a function of canceling rotation according to claim 1, wherein The despinning sheet is offset from the center of the elbow pipe second bend section by 10% of the diameter of the second bend section.

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