A water inlet channel for a water jet propulsion device with reverse silt flushing and vortex prevention functions

Abstract

The present invention provides a water inlet flow channel of a water jet propulsion device with reverse silt flushing and anti-vortex functions, comprising a water inlet flow channel and a jet channel; the water inlet flow channel is installed inside a water jet propulsion ship, the water inlet flow channel has a water inlet and a water outlet, the water inlet is located at the bottom of the ship, the water outlet faces the stern of the ship and is connected with a water jet propulsion pump at the stern of the ship; the jet channel is arranged on the inner wall of the water inlet flow channel and is symmetrically distributed in the water inlet flow channel; the jet channel has an inlet end and an outlet end, the inlet end is arranged at the outlet, and the outlet end is arranged at the inlet; a remote control vector nozzle is installed at the outlet end, and a valve for controlling the switch of the jet channel is installed in the jet channel.

Description

Technical Field

[0001] The invention relates to the field of marine engineering, and in particular to a water inlet flow channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions. Background Art

[0002] At present, water jet propulsion technology is widely used in modern amphibious expeditionary vehicles, large and medium-sized naval landing ships, civilian yachts and other ships. Such water jet propulsion ships often need to sail in shallow water channels or shallow water areas, which are characterized by shallow water depth and easy sedimentation at the bottom of the riverbed. Therefore, when water jet propulsion ships are in special operating conditions such as mooring, sailing, and getting rid of stranding in these shallow water areas, the ships are in a state of large flow and low speed. At this time, under the suction effect of the propulsion pump, the mud and gravel at the bottom of the riverbed are easily sucked into the propulsion pump, thereby damaging the impeller and causing the propulsion pump to fail to work normally; at the same time, since the water inlet of the water inlet channel is close to the riverbed, the clearance at the bottom of the water jet propulsion ship is small, and a suction vortex is easily formed under the water inlet. The vortex is sucked by the propulsion pump and it is easy to aggravate the cavitation of the water pump and destroy the stability of the unit.

[0003] At present, the existing technology mainly prevents the gravel at the bottom of the riverbed from being sucked into the propulsion pump by installing a water inlet grid at the water inlet of the water jet propulsion pump device. However, in order to ensure that the water inlet flow of the water jet propulsion pump device is not lost, the opening density and size of the grid are limited, and it can only filter some larger gravel, and cannot completely prevent the underwater mud and gravel from being sucked in. In addition, since the occurrence and development of the suction vortex below the water inlet of the water jet propulsion pump device are all located underwater, it is difficult to effectively monitor and capture it with the existing technology, and therefore it is difficult to prevent and control it.

[0004] Therefore, in order to ensure the safe and reliable operation of the water jet propulsion device, prevent the water jet propulsion ship from easily inhaling mud, sand and gravel when operating in shallow water areas, damaging the impeller blades, and inhaling vortex belts, aggravating water pump cavitation, and destroying the stability of the unit, there is an urgent need for a water jet propulsion device inlet flow channel with reverse silt flushing and anti-vortex functions. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions, characterized in that it comprises a water inlet channel and a jet channel;

[0008] The water inlet channel is installed inside the water jet propulsion ship, and the water inlet channel has a water inlet and a water outlet. The water inlet is located at the bottom of the ship, and the water outlet faces the stern of the ship and is connected to the water jet propulsion pump at the stern of the ship.

[0009] The jet channel is arranged on the inner wall of the water inlet channel, symmetrically distributed in the water inlet channel, and welded integrally with the water inlet channel; the jet channel has an inlet end and an outlet end, the inlet end is arranged at the water outlet, and the outlet end is arranged at the water inlet; the outlet end is installed with a remote control vector nozzle, and a valve for controlling the switch of the jet channel is installed in the jet channel.

[0010] To optimize the above technical solutions, the specific measures taken also include:

[0011] Furthermore, there are 4, 6, 8 or 10 jet channels symmetrically distributed along the inner wall of the water inlet channel; an even number of jet channels with symmetrical design can ensure that the impact force generated by the jet does not affect the stability of the ship.

[0012] Furthermore, the jet angle of the remote-controlled vector nozzle is 0-180°, which is convenient for the remote-controlled vector nozzle to clean the mud and sand at the bottom of the river bed below the water jet propulsion ship.

[0013] Furthermore, the remote-controlled vector nozzle is a remote-controlled vector nozzle with a tapered cone. Compared with the water jet passing through an ordinary straight pipe outlet, the water jet passing through the tapered cone outlet has a higher flow rate and a longer range, so it has a greater impact force on the sand bed at the bottom of the river.

[0014] The beneficial effects of the present invention are:

[0015] The present invention provides a water inlet channel of a water jet propulsion device with reverse silt flushing and anti-vortex functions, which has an even number of jet channels symmetrically distributed along the inner wall of the water inlet channel, so as to avoid the occurrence of hull instability caused by asymmetric distribution. When in use, high-speed water flows into the jet channel from the inlet end, and is ejected from a remote-controlled vector nozzle with a tapered cone at the outlet end. The remote-controlled vector nozzle can adjust the angle of water flow injection and increase the range of water flow injection. Compared with ordinary straight pipe water flow, the water flow ejected by the tapered cone has a higher injection speed and a longer range, and has a greater impact on the riverbed sand bed.

[0016] Before a waterjet-propelled ship sets sail, the valve is opened and the waterjet pump is operated in reverse. The jet channel is used to clear the silt below the water inlet for a period of time. After the cleaning is completed, the ship is started. At this time, there will be no mud, sand and gravel below the water inlet at the bottom of the ship, and the clear space at the bottom of the ship is increased. No suction vortex will be generated below the water inlet, ensuring the safe and stable operation of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is the working state of the shallow water area of ​​the water inlet channel of the conventional water jet propulsion device without dredging;

[0018] Figure 2 The water jet propulsion device of the present invention is in working state after the shallow water area of ​​the water inlet channel is desilted;

[0019] Figure 3 It is a schematic diagram of the jet channel of the water inlet channel of the water jet propulsion device of the present invention;

[0020] Among them, 1 is a water inlet channel, 101 is a water inlet, 102 is a water outlet, 2 is a jet channel, 201 is an inlet end, 202 is an outlet end, 203 is a remote control vector nozzle, and 204 is a valve. DETAILED DESCRIPTION

[0021] Combination Figure 2-3 As shown, a water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions comprises a water inlet channel 1 and a jet channel 2;

[0022] The water inlet channel 1 is installed inside the water jet propulsion ship, and the water inlet channel 1 has a water inlet 101 and a water outlet 102. The water inlet 101 is located at the bottom of the ship, and the water outlet 102 faces the stern of the ship and is connected to the water jet propulsion pump at the stern of the ship.

[0023] The jet channel 2 is arranged on the inner wall of the water inlet channel 1, and a total of 6 jet channels are symmetrically distributed in the water inlet channel 1, and are integrally formed with the water inlet channel; the jet channel 2 has an inlet end 201 and an outlet end 202, the inlet end 201 is arranged at the water outlet 102, and the outlet end 202 is arranged at the water inlet 101; the outlet end 202 is installed with a remote-controlled vector nozzle 203 with a jet angle of 0 to 180° and a tapered cone, and a valve 204 for controlling the switch of the jet channel 2 is installed in the jet channel 2.

[0024] The working principle of the present invention is as follows:

[0025] The working state of ordinary water jet propulsion device in shallow water area is as follows Figure 1 As shown, since the static distance between the water inlet 101 of the water inlet channel 1 and the silt at the bottom of the riverbed is less than 0.5 times the draft of the ship, a suction vortex is easily generated below the water inlet 101, and the suction vortex carries silt into the water jet propulsion device. The entrained silt seriously damages the safety of the water jet propulsion pump and other devices, and shortens their service life.

[0026] The working state of the water jet propulsion device provided by the present invention after dredging the shallow water area of ​​the water inlet channel is as follows: Figure 2When desilting is not required, the valve 204 inside the jet channel 2 is closed, the water jet propulsion pump runs forward, water flows in from the water inlet 101 of the water inlet channel 1, and then flows out from the water outlet 102 of the water inlet channel 1, driving the ship forward; when the ship is in a shallow water area (there is a lot of sediment at the bottom), ready to set sail or get rid of stranding and other special working conditions, after the water jet propulsion device starts working, the valve 204 inside the jet channel 2 is opened, the remote control vector nozzle 203 is adjusted to the predetermined jet direction, the water jet propulsion pump runs in the reverse direction, and the high-speed water flow (water flow speed ≥ 5m / s) in the flow channel enters from the inlet end 201 of the jet channel 2, and after passing through the jet channel 2, it is ejected from the remote control vector nozzle 203 at the outlet end 202, rushing towards the sediment at the bottom of the riverbed, and the sediment forms an impact sand pit, increasing the net distance between the water inlet 101 of the water inlet channel 1 and the sediment, so that the suction vortex caused by the small net distance disappears, and the sediment is no longer sucked into the water jet propulsion device. At this time, the valve 204 is closed, the water jet propulsion pump runs forward, and the water jet propulsion ship safely leaves the shallow water area.

[0027] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments in their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0028] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions, characterized in that: It comprises a water inlet channel (1) and a jet channel (2); The water inlet flow channel (1) is installed inside a water jet propulsion ship, and the water inlet flow channel (1) has a water inlet (101) and a water outlet (102), wherein the water inlet (101) is located at the bottom of the ship, and the water outlet (102) faces the stern of the ship and is connected to a water jet propulsion pump at the stern of the ship; the water jet propulsion pump can operate in a forward direction or a reverse direction; The jet channel (2) is arranged on the inner wall of the water inlet channel (1) and is symmetrically distributed in the water inlet channel (1); the jet channel (2) has an inlet end (201) and an outlet end (202); the inlet end (201) is arranged at the water outlet (102), and the outlet end (202) is arranged at the water inlet (101); a remote-controlled vector nozzle (203) is installed at the outlet end (202), and a valve (204) for controlling the opening and closing of the jet channel (2) is installed in the jet channel (2); When the ship is in a shallow water area, preparing to set sail or to get out of a grounding, the water jet propulsion device starts to work, the valve (204) inside the jet channel (2) is opened, the remote-controlled vector nozzle (203) is adjusted to a predetermined jet direction, the water jet propulsion pump runs in the reverse direction, and the high-speed water flow in the flow channel enters from the inlet end (201) of the jet channel (2), and the water flow velocity of the high-speed water flow is ≥5m / s; after passing through the jet channel (2), it is ejected from the remote-controlled vector nozzle (203) at the outlet end (202) and rushes towards the sediment at the bottom of the riverbed, the sediment forms an impact sand pit, and the net distance between the water inlet (101) of the water inlet channel (1) and the sediment is increased, so that the suction vortex caused by the smaller net distance disappears, and the sediment is no longer sucked into the water jet propulsion device.

2. The water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions according to claim 1, characterized in that: The jet channels (2) are symmetrically distributed in number of 4, 6, 8 or 10 along the inner wall of the water inlet channel (1).

3. The water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions according to claim 1, characterized in that: The jet angle of the remote-controlled vector nozzle (203) is 0 to 180°.

4. The water inlet channel of a water jet propulsion device with reverse silt flushing and vortex prevention functions according to claim 1, characterized in that: The remote-controlled vector nozzle (203) is a remote-controlled vector nozzle (203) having a tapered cone.

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