Adjustable flexible uniform-section ditching spraying arm

Abstract

The utility model discloses an adjustable flexible uniform-section ditching spraying arm, which comprises a conveying pipe main body, a plurality of spraying parts, a trailing part and a tail nozzle, the plurality of spraying parts extend on the surface of the conveying pipe main body in a vertically downward direction along the central line of the conveying pipe main body, the conveying pipe main body is at least provided with a flow regulator, and the tail nozzle is arranged on the surface of the conveying pipe main body. The flow regulator is used for regulating the fluid speed and / or pressure of different sections in the conveying pipe main body, and at least comprises a first booster pump which is arranged at the middle section of the conveying pipe main body in the length direction.

Description

Technical Field

[0001] The utility model belongs to the technical field of underwater jet trenching, and in particular relates to an adjustable flexible equal-section trenching spray arm. Background Art

[0002] The operation of submarine jet trenchers in sticky sandy soil is particularly critical, and the soil breaking process involves complex physical and chemical changes. The soil breaking mechanism includes impact, shear, extrusion, water wedge, dynamic pressure damage, cavitation and fatigue damage.

[0003] The spray arms used in submarine trenching operations face a series of design and engineering challenges, especially the forward-adjustable variable-section spray arms. The design of this type of spray arm must take into account the fluid dynamics, mechanical strength of the structure, appropriate material selection, and operational flexibility and efficiency. The R&D team needs to conduct in-depth research on the flow characteristics of water in the variable-section spray arms to ensure its stability and efficiency under high-pressure spraying conditions. At the same time, the structural design must be able to withstand the extreme pressures and loads during submarine operations, which usually requires the use of high-strength and corrosion-resistant materials. In addition, in order to improve operational efficiency and reduce maintenance costs, the design of the spray arms also needs to be easy to operate and quickly replace worn parts.

[0004] The Chinese invention patent "An Optimization Design Method for the Spray Arm of an Underwater Jet Trencher" with patent number ZL201910167907.X proposes an optimization design method for a variable-section spray arm and has achieved remarkable technical results. However, it mainly conducts preliminary design and optimization of the shape of the spray arm. Under the same pump head conditions, the loss along the pipeline is considered and the shape of the spray arm is designed by combining theoretical analysis and numerical simulation, which provides a reference for the design and development of the spray arm of a jet trencher in the future.

[0005] However, such a design method requires in-depth research on the seabed conditions before each trenching to obtain a series of parameters before targeted design can be carried out. Even so, it is difficult to solve the situation where the seabed soil characteristics change with regional changes. The only way is to fine-tune the jet speed according to the changes in the seabed conditions. That is, the design and manufacturing cost of the variable cross-section jet arm is high, the applicability is relatively poor, and the adjustability with the seabed siltation is poor. Utility Model Content

[0006] An embodiment of the utility model provides an adjustable flexible uniform-section trenching spray arm, comprising a conveying pipe body, a plurality of spray parts, a trailing part, and a tail nozzle, wherein the plurality of spray parts extend vertically downward on the surface of the conveying pipe body along the center line of the conveying pipe body, and the conveying pipe body is provided with at least one flow regulator for adjusting the fluid velocity and / or pressure in different sections inside the conveying pipe body.

[0007] Furthermore, the flow regulator includes a first booster pump, which is arranged at the middle section of the delivery pipe body in the length direction.

[0008] Furthermore, the flow regulator also includes a second booster pump, which is arranged near the trailing portion or at the trailing portion.

[0009] Furthermore, the driving device of the flow regulator is arranged inside or outside the delivery pipe body.

[0010] Furthermore, the driving device of the flow regulator is arranged on the outer surface of the upper side wall of the delivery pipe body or is arranged around the delivery pipe body.

[0011] Furthermore, the driving device of the flow regulator drives the rotation of the blade surface in the conveying pipe body by direct contact or indirect contact.

[0012] Furthermore, the driving device of the flow regulator drives the rotation of the blades in the conveying pipe body by non-contact electromagnetic driving.

[0013] Furthermore, one or more ventilation pipes are fixedly arranged on the outer cylindrical surface of the conveying pipe body, and the surface of the ventilation pipe is provided with multiple air holes, so as to spray gas toward the surface of the injection part to achieve controllable ventilation erosion reduction; two ventilation pipes are fixedly arranged symmetrically on the outer cylindrical surface of the conveying pipe body along both sides of the injection part to achieve controllable ventilation erosion reduction by spraying gas toward the two side surfaces of the injection part.

[0014] Furthermore, the angle between the plane formed by the center line of the ventilation pipe and the center line of the delivery pipe body and the vertical plane is 0-30°, and the vertical plane is the plane formed by the center line of the delivery pipe body and the extending direction of the multiple injection parts.

[0015] Furthermore, the aperture of the pores increases gradually from top to bottom, and the pores are arranged to be inclined inwardly toward the injection portion.

[0016] The beneficial effects of the utility model include improving the adaptability, stability and reliability of the trenching spray arm, reducing the damage to the excavation equipment caused by the cavitation effect, reducing the replacement cost and replacement cycle, achieving a directional and controllable erosion reduction effect, and taking into account both the optimized controllable erosion reduction effect and the optimized trenching efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only schematic and do not limit the protection scope of the present invention, wherein:

[0018] Figure 1The position of two booster pumps in the adjustable flexible equal-section trenching spray arm according to the utility model is shown;

[0019] Figure 2 A schematic diagram of the structure of an adjustable flexible uniform cross-section trenching and spraying arm according to an embodiment of the utility model is shown;

[0020] Figure 3 The effect of cavitation on sludge / accumulation and the extent of the effect on the delivery pipe body and the jet section are shown;

[0021] Figure 4 Shows Figure 1 A partially enlarged schematic diagram of a cavitation suppression structure of an adjustable flexible uniform cross-section trenching spray arm according to an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a variant structure of an adjustable flexible uniform cross-section trenching and spraying arm according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention is described in detail below in conjunction with specific embodiments and their accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary and should not be construed as limitations on the implementation methods of the present invention and the scope of protection of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims of this application and its specification, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0024] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the utility model and schematically show the shapes of various parts and their mutual relationships. It should be understood that in order to clearly show the structure of various components of the embodiments of the utility model, the drawings are not drawn according to the same scale, and the same reference numerals are used to represent the same parts in the drawings.

[0025] like Figure 1As shown, according to one aspect of the utility model, there is provided a non-variable cross-section jet spray arm 100B with a booster pump, which includes: a conveying pipe body 10, a plurality of jet parts 11, a tail part 12, and a tail nozzle 13, wherein the plurality of jet parts 11 extend vertically downward on the surface of the conveying pipe body 10 along the center line of the conveying pipe body 10, and the jet parts 11 pressurize and output the high-pressure liquid (usually seawater or purified water) fed by the conveying pipe body 10 to directionally remove accumulations such as silt through impact action to form grooves / ditches for burying cables, that is, to form grooves for accommodating cables, and at least one first booster pump 14 arranged inside the conveying pipe body 10, which is arranged inside the conveying pipe body 10 and is located in the middle area of ​​the length direction of the conveying pipe body 10.

[0026] As an optimized variation, a second booster pump 15 can also be arranged inside the delivery pipe body 10 near the bottom corner, wherein the first booster pump 14 is mainly used to adjust the nozzle pressure from the lower half of the spray arm to the corner, and the second booster pump 15 is arranged near the tail portion 12 or near the tail nozzle 13, and is mainly used to adjust the pressure of the fluid sprayed by the tail nozzle 13 of the tail portion 12, which is equivalent to achieving the effect of variable diameter of the tail nozzle 13.

[0027] It should be understood that, although not illustrated, three or even more booster pumps can be arranged at different positions of the conveying pipe body 10, so that the adaptability of the trenching spray arm to seabed trenching can be enhanced without changing the appearance of the spray arm 100B and without increasing additional manufacturing difficulties.

[0028] In terms of use, the second booster pump 15 can also play the role of a shut-off valve, that is, the flow rate of the fluid through the tail nozzle 13 can be controlled by controlling the rotation direction and / or speed of the second booster pump 15, thereby changing and adjusting the flow rate and flow rate of the fluid ejected through the ejection part 11. It can be understood that when the second booster pump 15 is controlled so that the fluid does not flow out from the tail nozzle 13 but all or almost all flows out through the ejection part 11, the pressure of the fluid ejected from the ejection part 11 at different length positions of the delivery pipe body 10 tends to be the same, and its effect includes regularly cleaning or debugging the ejection part 11 when necessary.

[0029] Furthermore, the first booster pump 14 and the second booster pump 15 can be the same water pump or different water pumps, and preferably the power of the first booster pump 14 is greater than that of the second booster pump. It should be understood that the booster pump is only the name of a component, and can also be called a "boost pump", "regulating pump" or other terms, as long as its function includes adjusting the fluid pressure ejected by the ejection part 11 at different positions of the delivery pipe body 10, it belongs to the concept of the present application.

[0030] Furthermore, in order to facilitate the installation and maintenance of the first booster pump 14 and / or the second booster pump 15, the delivery pipe body 10 is provided with a sealing window (not shown) for installation or maintenance at the location where the booster pump is installed, and / or the delivery pipe body 10 is assembled in sections so as to facilitate the installation and maintenance of the booster pump.

[0031] Furthermore, the driving device or driving part (not shown) of the first booster pump 14 and / or the second booster pump 15 can be arranged inside or outside the conveying pipe body 10. When arranged outside, it is preferably arranged on the upper side wall of the conveying pipe body 10. The driving part can drive the blades of the booster pump to rotate by means of gears, chains, transmission belts, etc.

[0032] It should be understood that the first booster pump 14 and / or the second booster pump 15 can be understood as a complete pump assembly with a driving device, or can be a booster assembly containing only bearings, a rotating shaft and blades.

[0033] Preferably, the shaft of the first booster pump 14 and / or the second booster pump 15 for driving the blades or vanes to rotate can be configured as a motor rotor, and the stator for driving is disposed around the outer peripheral side of the conveying pipe body 10 .

[0034] In a non-limiting manner, Figure 2 and Figure 3 As shown, the adjustable flexible uniform cross-section trenching spray arm 100 according to the embodiment of the present application includes a vent pipe 20, and the direction of the center line of the air hole 21 of the vent pipe 20 can be set to point to the spray part 11 or to point to the vertical plane where the center line is located (that is, inwardly inclined toward the spray part 11), so as to protect the entire or specific part of the spray part 11. Preferably, the angle between the center line direction (spraying direction) of the air hole 21 and the vertical plane where the center line of the conveying pipe body 10 is located is 0-30°, that is, Figure 4 In the figure, the angle between the plane formed by the center line of the ventilation pipe 20 and the center line of the conveying pipe body 10 and the plane perpendicular to the paper surface is 0-30°.

[0035] like Figure 4 As shown, in the partial enlargement 200 of the adjustable flexible uniform cross-section trenching and spraying arm 100 according to the embodiment of the utility model, the air holes 21 on the ventilation pipe 20 are evenly and equidistantly distributed.

[0036] It should be understood that although Figure 2 and Figure 4 The vent pipe 20 shown in FIG. 1 is provided on the cylindrical surface of the delivery pipe body 10 by welding or the like, but in the Figure 5In the variant 100A of the adjustable flexible uniform-section trenching spray arm 100 according to the embodiment of the utility model, the vent pipe 20A can also be fixed to the injection portion 11 by welding or other forms and maintain a certain distance from the surface of the conveying pipe body 10, while making the center line of the vent pipe 20A parallel to the center line of the conveying pipe body 10; in this technical solution variant, although not shown, a plurality of air holes with different directions and distributed on both sides facing each other can be set on the surface of the vent pipe 20A, on the one hand, gas is sprayed toward the surface of the injection portion 11 to reduce the influence and damage of the cavitation effect on the injection portion 11 through ventilation cavitation reduction, and on the other hand, gas is sprayed toward the columnar surface of the conveying pipe body 10 to reduce the influence and damage of the cavitation effect on the conveying pipe body 10 through ventilation cavitation reduction.

[0037] In addition, if Figures 2 to 5 Another problem with the non-variable cross-section jet spray arm implemented according to the present invention is that as the length of the jet spray arm increases from top to bottom, if a variable cross-section design is not adopted, the insufficient jet impact force at the bottom of the ditch may easily lead to sediment backfilling.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An adjustable flexible equal-section trenching spray arm, characterized in that: It includes a conveying pipe body, multiple injection parts, a trailing part, and a tail nozzle. The multiple injection parts extend vertically downward on the surface of the conveying pipe body along the center line of the conveying pipe body. The conveying pipe body is provided with at least one flow regulator for adjusting the fluid velocity and / or pressure of different sections inside the conveying pipe body.

2. The adjustable flexible uniform cross-section trenching spray arm according to claim 1, characterized in that: The flow regulator includes a first booster pump, which is arranged at the middle section of the delivery pipe body in the length direction.

3. The adjustable flexible uniform cross-section trenching spray arm according to claim 1, characterized in that: The flow regulator further includes a second booster pump, which is arranged near the trailing portion or at the trailing portion.

4. The adjustable flexible uniform cross-section trenching spray arm according to claim 1, characterized in that: The driving device of the flow regulator is arranged inside or outside the conveying pipe body.

5. The adjustable flexible uniform cross-section trenching spray arm according to claim 4, characterized in that: The driving device of the flow regulator is arranged on the outer surface of the upper side wall of the delivery pipe body or is arranged around the delivery pipe body.

6. The adjustable flexible uniform cross-section trenching spray arm according to claim 4, characterized in that: The driving device of the flow regulator drives the rotation of the blade surface in the conveying pipe body by direct contact or indirect contact.

7. The adjustable flexible uniform cross-section trenching spray arm according to claim 4, characterized in that: The driving device of the flow regulator drives the rotation of the blade surface in the conveying pipe body by non-contact electromagnetic driving.

8. The adjustable flexible uniform cross-section trenching spray arm according to claim 4, characterized in that: One or more ventilation pipes are fixedly arranged on the outer cylindrical surface of the conveying pipe body, and the surface of the ventilation pipe is provided with multiple air holes, so as to spray gas toward the surface of the injection part to achieve controllable ventilation erosion reduction; two ventilation pipes are fixedly arranged symmetrically on both sides of the outer cylindrical surface of the conveying pipe body along the injection part to achieve controllable ventilation erosion reduction.

9. The adjustable flexible uniform cross-section trenching spray arm according to claim 8, characterized in that: The angle between the plane formed by the center line of the ventilation pipe and the center line of the delivery pipe body and the vertical plane is 0-30°, and the vertical plane is the plane formed by the center line of the delivery pipe body and the extending direction of the multiple injection parts.

10. The adjustable flexible uniform cross-section trenching spray arm according to claim 8, characterized in that: The aperture of the air hole increases gradually from top to bottom, and the air hole is arranged to be inclined inwardly toward the injection part.

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