JPH0654074B2 - Jet pump device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet pump device which can be suitably applied to, for example, a mining device for picking up and pulling a metal ingot on the deep sea floor.

[0002]

2. Description of the Related Art Metal lumps having a diameter of 0.5 to 25 cm, such as manganese, are scattered on a deep sea floor having a water depth of 5 to 6000 m. In a jet pump device used for a mining device for collecting such metal lumps and pulling them up to the sea surface, a large suction force is required to suck up the metal lumps and sand and mud on the seabed together with seawater. An improved jet pump system is desired.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a jet pump device having an improved suction force.

[0004]

According to the present invention, there is provided a jet pump main body having a linear passage coaxially connected to a suction pipe, and the jet pump main body has an axial direction of the linear passage as it goes upward. A plurality of injection passages directed to the jet pump main body in the circumferential direction of the jet pump body, and communicates with the linear passage, and the injection passage has a nozzle piece having a first passage for injecting pressure water from the pump in the center; A jet pump, which is provided with a second nozzle piece which surrounds a tip portion of the first nozzle piece and which injects compressed air from an annular second passage formed between the first nozzle piece and the outer periphery of the first nozzle piece. It is a device.

The present invention is also characterized in that a casing having a pressure chamber communicating with the first passage of the first nozzle piece is detachably provided on the jet pump body.

[0006]

According to the present invention, the pressure water from the first passage and the compressed air from the second passage, which is supplied to the outer periphery of the pressure water, are guided from the injection passage to the straight passage, and then to the passage. An upward flow is formed and a large suction force can be obtained.

Further, a casing is detachably provided on the jet pump main body, which facilitates maintenance and inspection of the first passage and the like and improves maintainability.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall system diagram of an embodiment of the present invention. The mining vessel 1 floats on the sea surface 2, and the bottom of the sea 3 is scattered with metal lumps such as manganese. This metal block is pulled up to the mining vessel 1 by the mining device 4 equipped with a jet pump according to the present invention. The seabed 3 has a depth of 5000, for example.
The depth is about 6000 m. A plurality of jet pumps P11, P12, Pi1, Pij, Pnm having the same structure are provided in the middle of the lifting pipe 5 which is a straight tubular suction pipe extending vertically.
Are sequentially interposed vertically.

Each of the jet pumps P11 to Pnm is individually associated with a water pressure pump P11 in its vicinity.
a, P12a, Pi1a, Pija, and Pnma are provided, respectively. These water pressure pumps P11a to Pn
The ma discharges water at each position where they are provided and supplies the water to the corresponding jet pumps P11 to Pnm.

The jet pumps P11 to Pnm include
Compressed air is supplied from the flexible tubes L1, Li, and Ln from the compressor 6 via the individual air flow rate regulator 7. Pressure water from the water pressure pumps P11a to Pnma and the flexible tube L1
~ Jet pump P1 with compressed air from Ln
An upflow is formed in the lifted pipe 5 according to 1 to Pnm. By this upward flow, it becomes possible to suck up the metal mass on the seabed 3 above the sea surface. Lifting pipe 5 is
A density meter 8 for measuring the density of an object passing through it, a flow meter 9 for measuring the flow rate of the object in the lift pipe 5, and a lift pipe 5.
A pressure gauge 10 for measuring the internal pressure is provided. Outputs from the densitometer 8, the flow meter 9 and the pressure gauge 10 are input to and processed by a controller 11 realized by a computer or the like.

A concentrator 12 for concentrating the metal mass on the seabed 3 is connected to the lower end of the lifting pipe 5. This collector 12
Has a caterpillar or the like and can self-propell, and collects metal lumps and guides them to the lower end of the ore pipe 5. A part of the lifting pipe 5 is made of a transparent material, and the situation in the lifting pipe 5 can be imaged by the television cameras 13 and 14 through the transparent material portion and displayed by the monitor display device 15. The mining machine 12 is also provided with television cameras 16 and 17, and it is possible to know the situation in which the metal ingot is scraped by the mining machine 12 in the mining ship 1. With the television cameras 13 and 14 provided in the lift pipe 5, it is possible to know the state of the metal ingot in the lift pipe 5 at the mining stop position. In an emergency or when driving is stopped,
It is necessary to discharge the metal mass from the lifting pipe 5, and the television cameras 13 and 14 are useful for this purpose.

The processing device 11 controls the operation of the mining device 4 in accordance with a predetermined program. For example, when the operation is started, the jet pumps P11 to Pnm are started to operate in order from top to bottom. Further, during continuous operation, these jet pumps P11 to Pnm are controlled to operate with high efficiency. Furthermore, when the operation is stopped, the jet pumps P11 to Pnm are stopped in order from the bottom to the top, which makes it possible to pump all the metal ingots in the lifting pipe 5 into the mining ship 1. In an emergency, appropriate operations can be performed to safely stop the operation. Furthermore, it is configured so that adjustment can be performed during continuous operation and operation can be performed during an emergency by manual operation.

FIG. 2 is a block diagram for the constant end pressure constant value control showing the configuration of the processing device 11 relating to the jet pumps P11 and Pij. A flow meter 9a and a pressure gauge 10c are provided in association with the jet pump P11, and further a pressure gauge 10a is provided. Pressure gauges 10a, 10
The output from c is input to the comparator 19, and its output is given to the speed control circuit 21 via the adder / subtractor 20.
The output from the flowmeter 9a is given to the flow rate / lift function generator 22, and the output thereof is given to the adder / subtractor 20. A flow meter 9c and a pressure gauge 10b are provided in association with another jet pump Pij, the output from the pressure gauge 10b is given to an adder / subtractor 23, and the output from the flow meter 9c is a function generator. 14 and the function generating circuit 24
The output from is given to the adder / subtractor 23. Adder / subtractor 2
The output from 3 is given to the speed control circuit 25 which controls the water pressure pump Pija. The output from the speed control circuit 25 is given to the air flow rate regulator 7 via the line 26. In this way, the water pressure pump Pija functions to keep the pressure at any point in the calculation constant, and the other water pressure pump P11a functions to distribute the lift of the two. In this way, the lift distribution of the jet pumps P11, Pij in each section is controlled while maintaining the pressure at a predetermined point in each section of the depth in the lifting pipe 5 at a predetermined calculation point. It becomes possible.

FIG. 3 shows a flow rate program control system according to another embodiment of the present invention. The hydraulic pump P11a related to the jet pump P11 is controlled by the output of the speed control circuit 27. The output from the flow meter 9d is given to the adder / subtractor 28. An output from the speed control circuit 27 is given to the hydraulic pump Pija related to the jet pump Pij. The output of the flow meter 9e is given to the addition / subtraction circuit 30. The output from the program flow rate setting circuit 31 is given to the adder / subtractor circuits 28 and 30. The flow rate for any calculated point of the lifting pipe 5 can be maintained as a value according to a predetermined program.

FIG. 4 shows a direct control system according to still another embodiment of the present invention. The hydraulic pump P11a corresponding to the jet pump P11 is controlled by the control circuit 32. The output from the flow meter 9f is given to the control circuit 32. The measurement value of the flow meter 9f in the lifting pipe 5 is controlled by the deviation from the target value. In this case, it is necessary to consider that there is a time delay between the flow meter and the jet pump P11. The constant terminal pressure control method shown in FIG. 2 and the flow rate program control method shown in FIG.
It is possible to control individually or in combination with the direct control method shown in FIG. 2 to 4, the flowmeters 9a to 9f and the pressure gauges 10a and 10 are used.
b is used and these are omitted in FIG. 1 for the sake of simplification of the drawing.

As still another embodiment of the present invention, while measuring the mineral content by the density meter 8, the flow rates of the pressurized water and the compressed air in each of the jet pumps P11 to Pnm are adjusted to improve the ore efficiency. You may do it.
Furthermore, by using the television cameras 13, 14; 16 and 17, the state of lift-up in the lift-up pipe 5 and the collector 1
It is possible to monitor the state of concentration by the monitor display device 15.

FIG. 5 shows the pneumatic path from the flexible tube L1 associated with the jet pumps P11, P12. Flexible tube L
1 is provided with a distributor 33, and the distributor 33
Supplies the upper jet pump P11 with compressed air having a pressure P1 through a pipe 34, and also supplies the upper jet pump P11 with compressed air having a pressure P2 through a pipe 35.
If the pressure difference between the seawater in the jet pumps P11 and P12 is ΔP, the distributor 33 is configured such that the pressures P1 and P2 of the compressed air have the relationship of equation 1.

[0018]

[Equation 1] P2 = P1 + ΔP In this way, the lower jet pump P10 is supplied with compressed air having a higher pressure difference ΔP, and thus it is possible to efficiently form an upward flow in the lifting pipe 5. . In this way, the jet pumps P11, P12 form a first group, and the remaining jet pumps Pi1, P12
ij forms the i-th group, and the jet pump Pnm forms the n-th group. In this way, compressed air is supplied from the flexible tubes L1, Li, Ln to each group, The pressure of the compressed air supplied to each of the jet pumps P11 to Pnm is adjusted by the distributors 33, 36, 37 (see FIG. 1) provided for each of the flexible tubes L1, Li, Ln, enabling highly efficient mining. Becomes

FIG. 6 shows a configuration related to the television camera 13 provided in the lift pipe 5. Density meters 8a and 8b are appropriately provided in the middle of the lifting pipe 5, and the output thereof is given to the processing device 11. A part of the lifted pipe 5 to which the television camera 13 is attached is provided with a tubular portion 37 made of a transparent material so that the inside of the lifted pipe 5 can be seen through. The video signal inside the lift pipe 5 captured by the television camera 13 is given to the monitor display device 15 via the tubular portion 37.

FIG. 7 shows a damper 98 provided on the lift pipe 5.
Shows a part of. A mounting cylinder 38 is screwed to the lifting pipe 5, and a bracket 39 is fixed to the mounting cylinder 38. The head-side end of the single-acting cylinder 40 is fixed to the bracket 39 by a pin 41. Piston rod 42
Is connected by a pin 46 to a bracket 45 of an oscillating tube 44 in which the upper end portion 43 is fitted in the mounting cylinder 38. The swing tube 44 is connected to the mounting cylinder 38 by a pin 47.
The lower end of the rocking pipe 44 can be fitted into a mounting member 48 mounted on the lifting ore pipe 5.

FIG. 8 is a section line VIII-VIII of FIG.
FIG. 9 is a sectional view seen from above, and FIG. 9 is a front view thereof. Guide plates 49 and 50 for guiding the rocking tube 44 extend vertically between the mounting cylinders 38 and 48. By supplying pressure oil to the cylinder 40, the piston rod 42 thereof is retracted,
The rocking tube 44 is angularly displaced around the pin 47 in the counterclockwise direction in FIG. As a result, the rocking tube 4 during the suspension of operation
Arrow 5 indicates a metal block that remains in the lift pipe 5 above 4.
It is discharged as 1. Further, the metal mass rising from the lifting pipe 5 below the rocking pipe 44 can be discharged outside the pipe as indicated by an arrow 52. In this way, the metal ingot in the lifting pipe 5 can be discharged to the outside of the lifting pipe 5 during and immediately before the suspension. The lower end of the rocking tube 44 is
10 is displaced from the mounting tube 48, as shown in FIG. 10, so that the downward metal mass passing through the rocking tube 44 is discharged as indicated by the arrow 51 as described above and does not return to the mounting tube 48. . The pin 47 having the rocking axis of the rocking pipe 44 extends in a direction perpendicular to the pipe axis of the lifting pipe 5.

FIG. 11 is a sectional view of the jet pump P11. The jet pump body 54 is connected to the lift pipe 5 by a flange joint 55.
4 has a straight passage 57 coaxially connected to the lift pipe 5. The jet pump main body 54 is provided with an injection passage 59 directed toward the tube axis 58 as it goes upward.

FIG. 12 is a sectional line XII-XII of FIG.
13 is a partially exploded perspective view thereof, and FIG. 14 is a sectional view taken along section line XIV-XIV of FIG. 11. A plurality (5 in this embodiment) of injection passages 59 are formed in the circumferential direction of the jet pump main body 54, and each axis of the injection passages 59 is in an imaginary plane including the tube axis 58. At the lower end of the jet pump body 54,
An air chamber 60 is formed. In the air chamber 60, from the pipe line L1 and further from the pipe line 34 via the distributor 33,
Compressed air is supplied. In the jet pump body 54,
An annular body 63, which is a casing having an annular pressure water chamber 62, surrounds the lower tubular portion 54a of the jet pump body 54 by the attachment means 61. Pressure water is supplied to the pressure water chamber 62 from a water pressure pump P11a via a pipe line 64.

The mounting means 61 is a bracket 65 provided on the jet pump main body 54 as shown in FIG.
And a hinge pin 66a provided on the bracket 65
And the base end portion 67 of the bolt 66 is pivotally supported by the hinge pin 66a. The bolt 66 is gently inserted through the insertion hole 69 formed in the claw member 68, and is screwed into the nut 71 outside the lower end surface 70 of the claw member 68. The claw 72 of the claw member 68 fits into the recess 73 formed in the annular body 63. By tightening the nut 71, the claw 72 is maintained in the state of being engaged with the recess 73.

A communication hole 74 communicating with the pressure water chamber 62 is formed in the annular body 63. A gasket 75 is interposed between the jet pump body 54 and the annular body 63.

FIG. 15 is a cross-sectional view of another embodiment of the present invention corresponding to FIG. 14, and corresponding parts are designated by the same reference numerals. The injection passage 59 formed in the jet pump body 54 is offset by an angle θ in the clockwise direction with respect to an imaginary plane including the pipe axis 58 of the jet pump body 54, that is, with respect to the radial direction of the jet pump body 54. As a result, the fluid from the injection passage 59 is allowed to flow through the linear passage 57.
It is possible to turn inside.

FIG. 16 is a partial sectional view of the jet pump P11, and FIG. 17 is an exploded perspective view thereof. An inner screw 75 is formed at the base end portion of the injection passage 59, and an inner screw 76 having a larger diameter than that is formed behind the inner screw 75 (on the left in FIG. 16 and below in FIG. 11). The outer screw 78 of the first nozzle piece 77 is screwed onto the inner screw 76. First nozzle piece 77
An engaging groove 79 for engaging a fastening tool such as a driver for mounting the first nozzle piece 77 by rotating it about its axis is formed at the end of the. The pressure water from the pressure water chamber 74 is the conical hole 8 of the first nozzle piece 77.
From 0 to a conical nozzle hole 81 with a smaller diameter than that,
In this way, the 1st passage 97 of pressure water is formed.

The outer screw 83 of the second nozzle piece 82 is screwed into the inner screw 75. This second nozzle piece 82 is also formed with an engagement groove 84 for engaging a fastener in order to screw the inner screw 75 and the outer screw 83. The second nozzle piece 82 has a conical nozzle hole 85 having an inner diameter larger than the outer circumference of the first nozzle piece 77. In this way, the second passage 86 for supplying compressed air is formed between the outer peripheral surface of the first nozzle piece 77 and the inner peripheral surface of the second nozzle piece 82.

A tubular spacer 89 is interposed between the annular end surface 87 facing the upstream side of the first nozzle piece 77 and the end surface 88 facing the downstream side of the second nozzle piece 82. A plurality of air passage holes 90 are formed in the spacer 89 in the circumferential direction. An air supply hole 91 is formed in the air chamber 60 of the jet pump body 54 so as to correspond to the air passage hole 90. Since the positions of the air supply hole 91 and the air passage hole 90 are exactly aligned with each other in the circumferential direction, the spacer 89 is formed with a positioning projection 93 protruding outward.
As shown in FIG. 18, the positioning protrusion 93 can be fitted into a positioning recess 94 formed to face the air supply hole 91 and extending along the axis of the injection passage 59.

In this way, the compressed air from the air chamber 60 passes from the air supply hole 91 to the air passage hole 90 of the spacer 89.
Then, the fuel is injected from the second passage 86. The passage cross-sectional area of the second passage 86 can be appropriately determined by appropriately selecting the length L of the spacer 89. This allows precise adjustment of the jet flow. By removing the mounting means 61, the annular body 63 can be sufficiently displaced downward in FIG. 11, and maintenance such as replacement of the first and second nozzle pieces 77 and 82 and the spacer 89 is facilitated.

Since a layer of compressed air from the second passage 86 is formed on the outer periphery of the pressure water injected from the nozzle hole 81, the pressure water and the compressed air smoothly flow through the injection passage 59, and the straight passage 57 is formed. Be smoothly guided to. In this way, the pressure water injected from the injection passage 59 into the straight passage 57 allows a large pressure to act upward on the water in the straight passage 57 to form a high-speed upward flow. In particular, the air injected from the injection passage 59 into the straight passage 57 surrounds the upward flow in the straight passage 57 in a substantially cylindrical shape, so that the fluid resistance in the pipe is higher than that when air is not supplied. The loss can be reduced as much as possible and the flight distance of the upward flow can be extended, which makes it possible to efficiently suck in minerals such as metal lumps. In addition, in order to allow the fluid from the injection passage 59 to be supplied to the jet pump main body 54 without disturbing as much as possible, the pipe line 95 above the jet pump main body 54 is formed to be relatively long. Has been done.

Moreover, in the ascending flow of the linear passage 57, the ascending speed is accelerated by the air lift effect of the air injected from the injection passage 59, and a large suction force can be obtained.

Further, since compressed air is jetted around the pressure water jetted from the first nozzle 77, diffusion of the pressure water immediately after jetting is prevented to reduce or eliminate pressure loss, and cavitation wear is prevented. Can be prevented.

As another embodiment of the present invention, another pressure fluid may be used instead of the pressure water.

Further, the jet pump device according to the present invention comprises:
It can be applied not only to a mining device but also to any device requiring a large suction force.

[0036]

As described above, according to the present invention, the pressurized water from the first passage of the first nozzle piece and the compressed air from the second passage of the second nozzle piece are injected into the linear passage. Therefore, a large jet force can be obtained by the jet force of the pressure water and the compressed air jetted around the pressure water. Since the pressure water surrounded by the compressed air having such a large jet force is jetted from the jet passage to the straight passage, the rise in the straight passage near the opening of the jet passage facing the straight passage. The flow can be prevented from flowing into the opening side, and the occurrence of turbulence can be prevented.
Further, since the upward flow in the linear passage can be surrounded by the air injected from the injection passage, the fluid resistance in the linear passage is reduced to form a high-speed upward flow, and a large suction force is generated. Obtainable. Further, since the compressed air is supplied to the outer periphery of the pressure water, direct contact between the inner peripheral surface of the injection passage and the pressure water is reduced as much as possible, thereby reducing the pressure loss. It is possible to prevent cavitation wear.

Further, according to the present invention, since the casing is detachably attached to the jet pump main body, maintenance and inspection can be easily performed, and maintainability can be improved.

[Brief description of drawings]

FIG. 1 is an overall system diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing a constant end pressure control method, showing a configuration for operating the jet pump of the present invention.

FIG. 3 is a block diagram showing a flow rate program control system according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a direct control system according to still another embodiment of the present invention.

FIG. 5 is a system diagram of compressed air supplied to a jet pump P11.

FIG. 6 is a diagram showing a configuration related to a television camera 13.

FIG. 7 is a cross-sectional view of a damper provided in the middle of the lifting ore pipe 5.

8 is a cross-sectional view taken along the section line VIII-VIII in FIG. 7.

FIG. 9 is a right side view of the damper.

FIG. 10 is a sectional view showing a state in which a damper is opened.

FIG. 11 is a sectional view of a jet pump P11.

12 is a cross-sectional view taken along the section line XII-XII in FIG.

13 is an exploded perspective view of a mounting means 61. FIG.

14 is a cross-sectional view taken along the section line XIV-XIV in FIG.

15 is a sectional view corresponding to FIG. 14 of another embodiment of the present invention.

FIG. 16 is a partial cross-sectional view of a jet pump P11.

FIG. 17 is an exploded perspective view of the configuration shown in FIG.

FIG. 18 is a cutaway perspective view near a compressed air supply hole 91.

[Explanation of symbols]

 1 Mining Ship 3 Seabed 4 Mining Device 5 Mining Pipe 8 Density Meter 9,9a-9f Flowmeter 10, 10a, 10b Pressure Gauge P11-Pnm Jet Pump P11a-Pnma Water Pressure Pump

Claims (2)

[Claims] 1. A jet pump main body having a linear passage coaxially connected to a suction pipe, the jet pump main body having an injection passage extending toward the axial direction of the linear passage as it goes upward. A plurality of nozzles are provided in the circumferential direction of the nozzle and communicate with a linear passage, and in this injection passage, a nozzle piece having a first passage for injecting pressure water from a pump in the center and a tip portion of the first nozzle piece are And a second nozzle piece for injecting compressed air from an annular second passage formed between the first nozzle piece and the outer circumference of the first nozzle piece. 2. The jet pump device according to claim 1, wherein a casing having a pressure water chamber communicating with the first passage of the first nozzle piece is detachably provided on the jet pump body.