Novel underwater jet cutter and ditching device

Abstract

The utility model provides a novel underwater jet cutter and trenching device, the underwater jet cutter comprises a first cutter body and a first nozzle group comprising a plurality of nozzles, the first cutter body is internally provided with a first fluid cavity channel penetrating and extending between two ends of the first cutter body, one end of the first cutter body is used for being connected with a trenching device main body, and the other end of the first cutter body is used for being connected with a trenching device main body. A first water inlet communicated with the first fluid cavity channel is formed in the end, the top wall of the first fluid cavity channel is parallel to the bottom wall of the first fluid cavity channel and extends towards the other end of the first cutter body by a first preset length, and then the first fluid cavity channel obliquely extends towards the bottom wall; the first nozzle set is arranged on the lower side of the first cutter body, the water inlet end of each nozzle is communicated with the first fluid cavity channel, and the water outlet end of each nozzle extends out of the first cutter body. According to the utility model, the first fluid cavity channel is integrally arranged in a through manner, and the nozzle is communicated with the first fluid cavity channel, so that a flow channel structure which is simple in structure and convenient to manufacture is formed, the flow channel structure is greatly simplified, and the reliability of the flow channel is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of trenching devices for laying submarine pipelines and cables, specifically to a novel underwater jetting blade and trenching device. Background Technology

[0002] Underwater trenching is a crucial construction step in marine engineering projects such as subsea pipeline laying and cable burial. For soft seabed environments such as silt and clay, high-pressure water jet impact trenching technology is widely used due to its advantages such as non-contact excavation and minimal environmental disturbance. This technology uses multiple high-pressure nozzles on a jetting blade to erode and destroy the seabed structure with high-speed water jets, forming trenches of a predetermined depth.

[0003] In existing technologies, to ensure uniform impact pressure of the water jet output from each nozzle, a multi-channel independent liquid supply structure is commonly used. The spray blade has independent pipes corresponding to the number of nozzles, with each pipe individually connected to one nozzle. A parallel flow channel design ensures pressure balance across all nozzles. However, as engineering demands for trenching efficiency increase, the number of nozzles typically needs to be increased to dozens or even more, requiring the integration of numerous independent pipes within the spray blade. This not only exponentially increases the complexity of the spray blade's cavity structure but also presents the following technical drawbacks:

[0004] 1. Increased structural complexity: The arrangement of multiple independent pipes requires balancing space utilization and flow resistance, which makes it difficult to optimize the internal flow channel topology, especially in small-sized jetting blades where flow channel interference is likely to occur.

[0005] 2. High manufacturing cost: Precision machining of multiple independent pipes requires high-precision CNC equipment, and as the number of nozzles increases, the material loss rate and processing time increase significantly.

[0006] 3. Increased reliability risks: The increased number of densely distributed independent pipe welds or connection nodes makes them prone to leakage or rupture accidents due to local fatigue failure under high pressure conditions.

[0007] Therefore, how to simplify the internal flow channel structure of the jet blade, reduce manufacturing costs, and maintain the pressure balance of the multi-nozzle system has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0008] In view of this, the purpose of this utility model is to provide a new type of underwater jetting blade and trenching device, which solves the problems of complex structural design, high manufacturing cost and poor reliability caused by the existing jetting blade having independent pipes inside corresponding to the number of nozzles.

[0009] To solve the above-mentioned technical problems, the technical solution used in this utility model is as follows:

[0010] The present invention discloses a novel underwater jetting knife, comprising a first blade body and a first nozzle group containing a plurality of nozzles. The first blade body is provided with a first fluid cavity extending through its two ends. One end of the first blade body is used to connect to the main body of a trenching device, and a first water inlet communicating with the first fluid cavity is provided at that end. The top wall of the first fluid cavity extends parallel to the bottom wall of the fluid cavity to the other end of the first blade body for a first preset length, and then extends obliquely toward the bottom wall.

[0011] The first nozzle group is disposed on the lower side of the first cutter body, and each nozzle is arranged at intervals along the extension direction of the first fluid channel. The water inlet end of the nozzle is connected to the first fluid channel, and the water outlet end extends out of the first cutter body.

[0012] Preferably, the axis of the nozzle is coplanar with the mid-longitudinal section of the first fluid cavity, and the water outlet end of the nozzle is inclined at a first preset angle toward the other end of the first blade body.

[0013] More preferably, a tail nozzle is provided at the other end of the first blade body, and the water outlet end of the tail nozzle extends out of the first blade body and is inclined upwards towards the first blade body at a second preset angle;

[0014] The second preset angle is the complementary angle of the first preset angle.

[0015] Preferably, starting from one end of the first blade body, the axis of the odd-numbered nozzles is coplanar with the mid-longitudinal section of the first fluid cavity, and the water outlet end of the nozzle is inclined towards the other end of the first blade body.

[0016] The water outlet of the even-numbered nozzles is inclined to the left or right side of the first blade body.

[0017] Preferably, it further includes a second blade body, a connecting pipe, and a second nozzle group containing a plurality of the nozzles. The second blade body is provided with a second fluid cavity extending through its two ends. One end of the second blade body is provided with a second water inlet communicating with the second fluid cavity. The second nozzle group is provided on the lower side of the second blade body. The second blade body and the first blade body are arranged parallel and symmetrically after being spaced at a preset distance. The first fluid cavity and the second fluid cavity are symmetrical. The first nozzle group and the second nozzle group are symmetrical.

[0018] The connecting pipe passes through the first cutter body and the second cutter body, and is connected to the first water inlet and the second water inlet. Both ends of the connecting pipe are used to connect to the water supply pump. The first cutter body and the second cutter body are both connected to the main body of the trenching device through the connecting pipe.

[0019] More preferably, starting from the same side end of the first cutter body and the second cutter body, the water outlet end of the even-numbered nozzle in the first nozzle group is inclined in a direction away from the second cutter body, and the axis of the odd-numbered nozzle is coplanar with the mid-longitudinal section of the first fluid cavity;

[0020] The water outlet of the even-numbered nozzle in the second nozzle group is inclined away from the first blade body, and the axis of the odd-numbered nozzle is coplanar with the mid-longitudinal section of the second fluid cavity.

[0021] More preferably, a reinforcing rib is provided between the first cutter body and the second cutter body.

[0022] More preferably, the first and second cutter bodies are provided with a plurality of rollers at intervals on their upper and / or lower sides.

[0023] More preferably, the upper sides of both the first and second blades are inclined away from their lower sides by a second predetermined length before being connected to the connecting pipe.

[0024] The present invention discloses a trenching device comprising a main body and a novel underwater jetting blade, wherein the main body is provided with an adjustment mechanism and the underwater jetting blade is rotatably connected to the main body through the adjustment mechanism.

[0025] Compared with the prior art, the beneficial effects of the novel underwater jetting knife described in this utility model are mainly reflected in:

[0026] This invention provides a through-flow fluid channel within the first cutter body, connecting the nozzle to the first fluid channel. This results in a simple and easy-to-manufacture flow channel structure. Compared to the need for independent pipes corresponding to the number of nozzles, this significantly simplifies the flow channel structure within the first cutter body, reduces manufacturing costs and difficulty, improves the reliability of flow channel operation, and avoids the problems of complex structure, high manufacturing cost, and poor reliability caused by setting independent pipes corresponding to the number of nozzles.

[0027] Meanwhile, the first fluid cavity adopts a structure in which its top wall extends parallel to its bottom wall to the other end of the first cutter body by a first preset length, and then extends obliquely to the bottom wall. This gradually reduces the flow area at the end of the first fluid cavity, which helps to reduce or even eliminate the reduction in jet pressure between the nozzle at the end of the first fluid cavity and the other nozzles, thereby improving the consistency between the jet pressure of the nozzle at the end of the first fluid cavity and the other nozzles, and thus ensuring the quality of trenching. Attached Figure Description

[0028] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0029] Figure 1 A three-dimensional structural diagram of a novel underwater jetting blade provided for an embodiment of this utility model;

[0030] Figure 2 A front view of a novel underwater jetting blade provided for an embodiment of this utility model;

[0031] Figure 3 A bottom view of a novel underwater jetting blade provided in an embodiment of this utility model;

[0032] Figure 4 for Figure 3 The A-node diagram in the image;

[0033] Reference numerals: 1. First cutter body; 2. Second cutter body; 3. First nozzle group; 4. Second nozzle group; 5. Nozzle; 6. Tail nozzle; 7. Connecting pipe; 8. Reinforcing rib; 9. Roller. Detailed Implementation

[0034] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0035] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0036] This embodiment provides a novel underwater jetting blade, such as Figures 1 to 2As shown, it includes a first cutter body 1 and a first nozzle group 3 containing a plurality of nozzles. The first cutter body 1 is provided with a first fluid cavity (not shown in the figure) extending through between its two ends. One end of the first cutter body 1 is used to connect to the main body of the trenching device, and a first water inlet (not shown in the figure) communicating with the first fluid cavity is provided at that end. The top wall of the first fluid cavity extends parallel to the bottom wall of the fluid cavity to the other end of the first cutter body 1 for a first preset length, and then extends inclined towards the bottom wall. The specific inclination angle needs to be determined according to the jet pressure performance of each nozzle in the spray test.

[0037] The first nozzle group 3 is disposed on the lower side of the first cutter body 1, and each nozzle 5 is arranged at intervals along the extension direction of the first fluid channel. The water inlet end of the nozzle 5 is connected to the first fluid channel, and the water outlet end extends out of the first cutter body 1.

[0038] This utility model forms a simple and easy-to-manufacture flow channel structure by setting a through first fluid cavity in the first cutter body 1, that is, setting the first fluid cavity as a whole through the first fluid cavity and connecting the nozzle 5 to the first fluid cavity. Compared with the need to set independent pipes corresponding to the number of nozzles, it greatly simplifies the flow channel structure in the first cutter body 1, reduces manufacturing costs and difficulties, improves the reliability of flow channel operation, and avoids the problems of complex structure, high manufacturing cost and poor reliability caused by setting independent pipes corresponding to the number of nozzles.

[0039] Meanwhile, the first fluid cavity adopts a structure in which its top wall extends parallel to its bottom wall to the other end of the first cutter body 1 by a first preset length, and then extends inclined to the bottom wall. This gradually reduces the flow area at the end of the first fluid cavity, which helps to reduce or even eliminate the reduction in jet pressure between the nozzle 5 at the end of the first fluid cavity and the jet pressure of other nozzles 5, thereby improving the consistency between the jet pressure of the nozzle 5 at the end of the first fluid cavity and the jet pressure of other nozzles 5, and thus ensuring the quality of trenching.

[0040] It should be noted that in this embodiment, "the lower side of the first cutter body 1" refers to the side of the first cutter body 1 facing the seabed or underwater geology when the spraying cutter is in the spraying working posture. All of the above nozzles 5 are high-pressure nozzles. In the preferred embodiment, each nozzle 5 is arranged at equal intervals, which can improve the uniformity of trench depth.

[0041] In a preferred embodiment, such as Figure 3 and Figure 4 As shown, the axis of nozzle 5 is coplanar with the longitudinal section of the first fluid cavity, and the water outlet end of nozzle 5 is inclined at a first preset angle toward the other end of the first cutter body 1. When the spraying cutter is in the spraying working posture, the angle of the first cutter body 1 is adjusted so that each nozzle 5 is perpendicular to the horizontal plane, thereby enabling vertical spraying onto the seabed or underwater geological surface; the first preset angle is preferably 45°.

[0042] In a further preferred embodiment, a tail nozzle 6 is provided at the other end of the first cutter body 1. The water outlet end of the tail nozzle 6 extends out of the first cutter body 1 and is inclined upwards towards the first cutter body 1 at a second preset angle; the second preset angle is the complementary angle of the first preset angle. In this embodiment, the second preset angle and the first preset angle are complementary angles to each other. Thus, when the spraying blade is in its spraying working posture and the other nozzles 5 are perpendicular to the horizontal plane, the tail nozzle 6 can spray in a horizontal posture. In this way, the tail nozzle can blow away mud and sand and prevent mud and sand from backfilling the trench; the second preset angle is preferably 45°.

[0043] In another preferred embodiment, such as Figure 3 and Figure 4 As shown, starting from one end of the first cutter body 1, the axis of the odd-numbered nozzles 5 is coplanar with the mid-longitudinal section of the first fluid cavity, and the water outlet end of the nozzle 5 is inclined towards the other end of the first cutter body 1; the water outlet end of the even-numbered nozzles 5 is inclined towards the left or right side of the first cutter body 1. In this embodiment, by staggered and regularly inclined arrangement of the nozzles 5, the trench width can be widened; the specific inclination angle should be appropriately selected according to the target trench width.

[0044] In another preferred embodiment, the system further includes a second cutter body 2, a connecting pipe 7, and a second nozzle group 4 containing a plurality of nozzles 5. The second cutter body 2 is provided with a second fluid cavity extending through its two ends. One end of the second cutter body 2 is provided with a second water inlet communicating with the second fluid cavity. The second nozzle group 4 is located on the lower side of the second cutter body 2. The second cutter body 2 and the first cutter body 1 are arranged parallel and symmetrically after being spaced at a preset distance. The symmetrical plane is located between the first cutter body 1 and the second cutter body 2 and is parallel to the first cutter body 1 and the second cutter body 2. The first fluid cavity is symmetrical to the second fluid cavity, and the first nozzle group 3 is symmetrical to the second nozzle group 4.

[0045] A connecting pipe 7 is installed through the first cutter body 1 and the second cutter body 2, and connects to the first water inlet and the second water inlet. Both ends of the connecting pipe 7 are used to connect to the water supply pump. The first cutter body 1 and the second cutter body 2 are both connected to the main body of the trenching device through the connecting pipe 7. Specifically, the connecting pipe 7 is provided with water inlets (not shown in the figure) corresponding to the first water inlet and the second water inlet, respectively. By connecting the first water inlet and the second water inlet to the corresponding water inlets, the connecting pipe 7 can be connected to the first fluid cavity and the second fluid cavity.

[0046] Similarly, in this embodiment, "the lower side of the second cutter body 2" refers to the side of the second cutter body 2 facing the seabed or underwater geology when the spraying cutter is in the spraying working posture. All of the above nozzles 5 are high-pressure nozzles. In the preferred embodiment, each nozzle 5 is arranged at equal intervals, which can improve the uniformity of trench depth. The preset distance between the first cutter body 1 and the second cutter body 2 is determined according to the target trench width.

[0047] Further preferred, such as Figure 3 and Figure 4 As shown, starting from the same side of the first cutter body 1 and the second cutter body 2, the water outlet of the even-numbered nozzle 5 in the first nozzle group 3 is inclined away from the second cutter body 2, and the axis of the odd-numbered nozzle 5 is coplanar with the mid-longitudinal section of the first fluid cavity; in the second nozzle group 4, the water outlet of the even-numbered nozzle 5 is inclined away from the first cutter body 1, and the axis of the odd-numbered nozzle 5 is coplanar with the mid-longitudinal section of the second fluid cavity. In this embodiment, by staggering and regularly inclined, the groove width can be widened; the specific inclination angle should be appropriately selected according to the target groove width.

[0048] Further preferred, such as Figure 1 and Figure 2 As shown, a reinforcing rib 8 is provided between the first cutter body 1 and the second cutter body 2. Preferably, the two ends of the reinforcing rib 8 are detachably connected to the first cutter body 1 and the second cutter body 2, so as to adjust the distance between the first cutter body 1 and the second cutter body 2 to adapt to different trenching width requirements.

[0049] Further preferably, multiple rollers 9 are spaced apart on the upper and / or lower sides of the first cutter body 1 and the second cutter body 2 for guiding various types of cables. Preferably, the two ends of the rollers 9 are detachably connected to the first cutter body 1 and the second cutter body 2 respectively, so as to adjust the distance between the first cutter body 1 and the second cutter body 2 to adapt to different trenching width requirements.

[0050] Further preferred, such as Figure 1 and Figure 2 As shown, the upper sides of the first blade 1 and the second blade 2 are inclined away from their lower sides by a second preset length before connecting to the connecting pipe 7, thereby increasing the structural strength of the connection between the first blade 1 and the second blade 2 and the connecting pipe 7 and improving the structural stability of the spraying blade.

[0051] Based on the aforementioned novel underwater jetting blade, a trenching device is also provided, comprising a main body and the aforementioned novel underwater jetting blade. The main body is equipped with an adjustment mechanism, and the underwater jetting blade is rotatably connected to the main body through the adjustment mechanism. This embodiment of the trenching device utilizes the aforementioned underwater jetting blade, which helps to reduce costs and improve the stability and reliability of the jetting operation.

[0052] In a preferred embodiment, when a first cutter body 1 and a second cutter body 2, or two or more cutter bodies are provided, the main body may also be provided with a width adjustment mechanism to adjust the distance between the first cutter body 1 and the second cutter body 2 or the distance between adjacent cutter bodies, thereby expanding the trenching width applicable to the trenching device and improving the applicability and economy of the trenching device.

[0053] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A novel underwater jetting blade, characterized in that: The device includes a first cutter body and a first nozzle group containing a plurality of nozzles. The first cutter body is provided with a first fluid cavity extending through its two ends. One end of the first cutter body is used to connect to the main body of the trenching device, and a first water inlet communicating with the first fluid cavity is provided at that end. The top wall of the first fluid cavity extends parallel to the bottom wall of the fluid cavity to the other end of the first cutter body for a first preset length, and then extends obliquely to the bottom wall. The first nozzle group is disposed on the lower side of the first cutter body, and each nozzle is arranged at intervals along the extension direction of the first fluid cavity. The water inlet end of the nozzle is connected to the first fluid cavity, and the water outlet end extends out of the first cutter body.

2. The novel underwater jetting blade according to claim 1, characterized in that: The axis of the nozzle is coplanar with the longitudinal section of the first fluid cavity, and the water outlet end of the nozzle is inclined at a first preset angle toward the other end of the first blade body.

3. The novel underwater jetting blade according to claim 2, characterized in that: The other end of the first blade is provided with a tail nozzle, the water outlet of the tail nozzle extends out of the first blade and is tilted upwards towards the first blade at a second preset angle; The second preset angle is the complementary angle of the first preset angle.

4. The novel underwater jetting blade according to claim 1, characterized in that: Starting from one end of the first blade body, the axis of the odd-numbered nozzles is coplanar with the mid-longitudinal section of the first fluid cavity, and the water outlet end of the nozzle is inclined towards the other end of the first blade body. The water outlet of the even-numbered nozzles is inclined to the left or right side of the first blade body.

5. A novel underwater jetting blade according to claim 1, characterized in that: It also includes a second cutter body, a connecting pipe, and a second nozzle group containing a plurality of the nozzles. The second cutter body is provided with a second fluid cavity extending through its two ends. One end of the second cutter body is provided with a second water inlet communicating with the second fluid cavity. The second nozzle group is provided on the lower side of the second cutter body. The second cutter body and the first cutter body are arranged parallel and symmetrically after being spaced at a preset distance. The first fluid cavity and the second fluid cavity are symmetrical. The first nozzle group and the second nozzle group are symmetrical. The connecting pipe passes through the first cutter body and the second cutter body, and is connected to the first water inlet and the second water inlet. Both ends of the connecting pipe are used to connect to the water supply pump. The first cutter body and the second cutter body are both connected to the main body of the trenching device through the connecting pipe.

6. A novel underwater jetting blade according to claim 5, characterized in that: Starting from the same side end of the first cutter body and the second cutter body, the water outlet end of the even-numbered nozzle in the first nozzle group is inclined away from the second cutter body, and the axis of the odd-numbered nozzle is coplanar with the mid-longitudinal section of the first fluid cavity. The water outlet of the even-numbered nozzle in the second nozzle group is inclined away from the first blade body, and the axis of the odd-numbered nozzle is coplanar with the mid-longitudinal section of the second fluid cavity.

7. A novel underwater jetting blade according to claim 5, characterized in that: A reinforcing rib is provided between the first blade and the second blade.

8. A novel underwater jetting blade according to claim 5, characterized in that: Multiple rollers are spaced apart on the upper and / or lower sides of the first and second cutter bodies.

9. A novel underwater jetting blade according to claim 5, characterized in that: The upper sides of both the first and second blades are inclined away from their lower sides by a second preset length before being connected to the connecting pipe.

10. A trenching device, comprising a main body, characterized in that: It also includes a novel underwater jetting blade as described in any one of claims 1 to 9, wherein the main body is provided with an adjustment mechanism, and the underwater jetting blade is rotatably connected to the main body through the adjustment mechanism.

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