A deep-sea mining lifting riser device

Abstract

A deep-sea mining lifting riser device, comprising a lifting riser connected to a pipe ship connection device of a mother ship, a watertight box, and an electric motor; the lifting riser at least comprises two fixedly connected pipe sections, the pipe sections are double-layer sleeves, flanges are provided at both ends of the pipe sections, and a hollow layer between the inner pipe and the outer pipe and the flanges at both ends are welded to form an annular cabin; the outer pipe is a closed cylindrical pipe, and this pipe section is defined as a buoyancy pipe section, and its annular cabin is defined as a buoyancy cabin; at the lower part of the lifting riser, there is at least one pipe section provided with a water injection port and a drain port communicating with the annular cabin on the outer pipe, and this pipe section is defined as a ballast pipe section, and its annular cabin is defined as a ballast cabin; driving members for injecting and discharging ballast water are provided on the water injection port and the drain port; a fixed anchor is further provided at the lower part of the lifting riser; thereby overcoming the defects of the existing deep-sea mining lifting riser device, such as large self-weight, drift, resonance, and difficult installation, and improving the working efficiency of deep-sea mining.

Description

Technical Field

[0001] The present invention relates to a deep-sea mining riser device, especially a steel deep-sea mining riser, belonging to the field of ocean engineering. Background Art

[0002] Deep-sea mining generally uses a surface mother ship as the support platform of the system. Below the pipe ship connection device at the bottom of the ship, a slurry lifting riser is connected down to a few hundred meters from the seabed. The top of the lifting riser is connected to the pipe ship connection device, and the bottom of the lifting riser is connected with a lifting pump set, a hose, a subsea mining vehicle, etc. The mining vehicle operates on the seabed, and the collected slurry is transported by a material pump through the hose to the inlet of the lifting pump set, and then the slurry is transported by the lifting pump set through the lifting riser to the surface mother ship.

[0003] The so-called pipe ship connection device is a connecting pipe installed at the bottom of the mother ship, containing a cylindrical pair and a spherical pair, and a device that uses the flange on the lower end face of the connecting pipe to connect with the flange on the upper end face of the lifting riser. The cylindrical pair of the connecting pipe ensures that the connecting pipe can move up and down along the axis of the connecting pipe, so as to avoid the interference of the up and down vibration generated by the lifting riser to the mother ship after the connecting pipe is connected to the lifting riser; the spherical pair of the connecting pipe can rotate in three directions at the spherical support of the connecting pipe, so as to avoid the interference of the longitudinal inclination, transverse inclination and rotation of the mother ship by the lifting riser after being connected to the lifting riser, thus ensuring the safe operation of the mother ship on the sea surface; for example, the patent publication number: CN 112127892 B, the patent name: A pipe ship connection device for a deep-sea mining ship, is an example of this pipe ship connection device.

[0004] Since the deep-sea mining riser is several kilometers long and each section of the steel lifting riser is only dozens of meters, the time required for laying the lifting riser is relatively long. Conversely, the recovery of the lifting riser also requires a long time. When a storm comes, the time for obtaining a forecast is often short. Therefore, when the mother ship needs to evacuate for emergency risk avoidance, it is difficult to recover the lifting riser in a short time. The current common practice is to disconnect the pipe ship connection device from the lifting riser, let the mother ship evacuate alone, and the lifting riser sinks to the bottom for risk avoidance by its own weight. After the sea conditions are normal, the mother ship returns to the operation area, then lifts the lifting riser from underwater, reconnects it with the pipe ship connection device on the mother ship and then conducts mining operations.

[0005] In order to prevent the bottom lifting riser from drifting, twisting at a large angle or even capsizing after leaving the mother ship, the patent application publication number is CN 116220690 A, and the patent application name is: Deep-sea mining mineral delivery pump pipe system adapted to the emergency evacuation needs of severe sea conditions. The buoyancy generated by the opening of a high-pressure retractable airbag is used to keep the bottom underwater delivery pump pipe system upright underwater; due to the opening of the airbag, the resistance surface of the underwater delivery pump pipe system to the underwater ocean current increases, and thus the underwater delivery pump pipe system is subjected to a greater force of the underwater ocean current, that is, the system not only cannot prevent the drift of the underwater delivery pump pipe system, but on the contrary, the underwater delivery pump pipe system may drift farther under the action of the underwater ocean current; in addition, the application also has the following defects: first, when the underwater delivery pump pipe system is working normally, the airbag is contracted, and the self-weight of the underwater delivery pump pipe system is borne entirely by the mother ship, which increases the self-weight of the mother ship. Second, after the underwater delivery pump and pipe system sinks to the bottom, it remains upright underwater, and its top is generally several hundred meters away from the sea surface. Therefore, it is difficult to connect the top of the sunken underwater delivery pump and pipe with the mother ship; third, during the launching process of the underwater delivery pump and pipe system, there is no measure to adjust its vibration frequency, and the resonance generated by the underwater delivery pump and pipe during the assembly process cannot be effectively avoided, which affects the assembly of the underwater delivery pump and pipe system; the role of the "underwater delivery pump and pipe system" in this patent application corresponds to the role of the "lifting riser device" in this patent application.

[0006] In summary, the current deep-sea mining lifting riser device has the following problems: first, after the lifting riser is connected to the mother ship, the weight of the mother ship increases, and the draft of the mother ship when it is unloaded increases; second, after the lifting riser device is separated from the mother ship, it drifts uncontrollably under the action of the seabed current; third, the bottom-sinking lifting riser device has a deep sinking depth, so it is difficult to reconnect with the mother ship; fourth, the resonance generated during the assembly process of the lifting riser cannot be effectively avoided. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects of the existing deep-sea mining lifting riser device, such as resonance generated during the assembly process, heavy weight, uncontrolled drift of the lifting riser after separation from the mother ship, and difficulty in reconnecting the lifting riser device that has sunk to the bottom with the mother ship. A deep-sea mining lifting riser device is invented to solve the above defects and improve the work efficiency of deep-sea mining.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0009] A deep - sea mining lifting riser device, comprising a lifting riser connected to a pipe - ship connection device of a mother ship, a watertight box, an electric motor, and a signal buoy; the lifting riser at least comprises two fixedly connected pipe sections, and is characterized in that: the pipe sections are double - layer sleeves, flanges are provided at both ends of the pipe sections, and an annular chamber is formed by welding the hollow layer between the inner pipe and the outer pipe and the flanges at both ends; the outer pipe is a closed cylindrical pipe, and this pipe section is defined as a buoyancy pipe section, and its annular chamber is defined as a buoyancy chamber; at the lower part of the lifting riser, there is at least one pipe section with a water injection port and a drainage port communicating with the annular chamber on the outer pipe, and this pipe section is defined as a ballast pipe section, and its annular chamber is defined as a ballast chamber; driving members for injecting and discharging ballast water are provided on the water injection port and the drainage port; an anchor is also provided at the lower part of the lifting riser.

[0010] The object of the present invention can also be further achieved by the following technical solution measures.

[0011] The inner wall of the inner pipe is coated with wear - resistant material.

[0012] For the ballast pipe section, the water injection port is located at the upper part of the ballast chamber, and the drainage port is located at the lower part of the ballast chamber.

[0013] In seawater, before ballasting, the buoyancy of the ballast pipe section of the lifting riser device is greater than its own weight.

[0014] On the upper and lower flange surfaces of the annular chamber of the bottom pipe section of the lifting riser, watertight sockets are provided, and the upper and lower watertight sockets are correspondingly connected by cables; except for the bottom pipe section of the lifting riser, watertight sockets are provided on the upper flange surface of the annular chamber of the other pipe sections, and watertight socket protection holes penetrating the flange are correspondingly provided on the lower flange surface. One end of the cable is connected to the watertight socket, and the other end of the cable is provided with a watertight plug and passes through the protection hole of the annular chamber; the watertight socket at the top of the lifting riser is connected to the watertight plugs correspondingly arranged in the power system and the control system on the mother ship.

[0015] For the driving members, the driving member for injecting ballast water into the ballast chamber is a water injection solenoid valve; a filter screen is provided at the water inlet P of the water injection solenoid valve and is connected to the sea; the water outlet A of the water injection solenoid valve is connected to the water injection port of the ballast chamber; the driving member for discharging ballast water from the ballast chamber is a hydraulic pump. A drainage solenoid valve is provided at the water inlet of the hydraulic pump and is connected to the water outlet A of the drainage solenoid valve. The water inlet P of the drainage solenoid valve is connected to the drainage port of the ballast chamber. A check valve is provided at the water outlet A of the hydraulic pump, and a drain port is provided at the outlet of the check valve and is connected to the sea; the hydraulic pump is driven by an electric motor.

[0016] The water injection solenoid valve, the hydraulic pump, the electric motor, the drainage solenoid valve, and the check valve are arranged in the watertight box; the watertight box is fixedly connected to the lower part of the lifting riser, and the water inlet P of the drainage solenoid valve and the water inlet of the hydraulic pump are not higher than the drainage port of the ballast pipe section.

[0017] The cable is the power line of the hydraulic pump and the control line of the solenoid valve.

[0018] A set of spare cables for the power line of the hydraulic pump and the control line of the solenoid valve are also provided on the mother ship; one end of the spare cable is hermetically fixed to the signal buoy through a watertight socket and can be connected to the watertight plugs correspondingly arranged in the power system and the control system of the mother ship. The other end of the spare cable can be connected to the watertight socket at the upper end of the lifting riser; when the mother ship evacuates, the watertight plug of the spare cable of the signal buoy is connected to the watertight socket at the upper end of the lifting riser, and the signal buoy floats on the sea surface of the lifting riser and can send position information timely.

[0019] Two positioning pins are also provided on the upper flange of each pipe section, and corresponding positioning pin holes are provided on the lower flange; a gasket is provided between the pipe sections.

[0020] Advantages and beneficial effects of the present invention:

[0021] For the deep-sea mining lifting riser device of the present invention, the lifting riser is assembled by pipe sections. Since the buoyancy pipe section is provided with a buoyancy chamber, the lifting riser device is affected by the buoyancy of the buoyancy chamber, and its buoyancy is greater than its own weight, ensuring that the lifting riser will not sink to the bottom underwater. Therefore, when the lifting riser is connected to the pipe ship connection device of the mother ship, the pipe ship connection device of the mother ship does not bear the self-weight of the lifting riser. That is to say, after the mother ship is connected to the lifting riser, its draft depth remains basically unchanged. When the lifting riser is connected to the mother ship, since the lower part of the lifting riser is hinged to one end of the anchor chain, and the anchor connected to the other end of the anchor chain hangs in the water, it does not affect the movement of the mother ship; after the lifting riser is separated from the mother ship, the lifting riser is ballasted and sinks to the bottom under the action of the ballast chamber, and at the same time drives the anchor chain to sink the anchor to the seabed, and the anchor restricts the sunken lifting riser from drifting on the seabed.

[0022] The ballast pipe section is provided. The ballast pipe section is arranged at the lower part of the lifting riser. The upper part of the ballast pipe section is provided with a water injection port, and the lower part of the ballast pipe section is provided with a drain port. If there is more than one ballast pipe section, in order to reduce the center of gravity of the lifting riser, when the lifting riser needs to sink, the pipe sections of the ballast chamber are sequentially filled with water from bottom to top; when the lifting riser needs to float, the ballast pipe sections are sequentially drained of water from top to bottom; by filling or draining water from the ballast chamber, not only can the floating height of the lifting riser be adjusted to facilitate connection with the pipe ship connection device of the mother ship, but also the lifting riser can be controlled to sink to the bottom or float out of the sea surface after being separated from the mother ship. In addition, the ballast pipe section is arranged at the lower part of the lifting riser, making the center of gravity of the lifting riser biased downward, so that the lifting riser can maintain an upright posture underwater.

[0023] Before the ballast pipe section is launched, first fill the ballast tank with water, sequentially connect the ballast pipe section and the buoyancy pipe section to form a lifting riser, and finally connect it to the pipe connection device on the mother ship. On the one hand, during the process of sequentially connecting the ballast pipe section and the buoyancy pipe section of the lifting riser, by adjusting the ballast water in the ballast tank, the natural vibration frequency of the lifting riser during the pipe section assembly and water entry process can be changed timely, so as to effectively avoid the resonance frequency range of the pipe section of the lifting riser during the assembly process, creating conditions for the pipe section assembly and water entry of the lifting riser; on the other hand, it avoids the ballast tank of the ballast pipe section being launched with an empty tank. When injecting water at the seabed, the air in the ballast tank cannot be effectively discharged outside the ballast tank, thus effectively improving the utilization rate of the ballast tank.

[0024] In the present invention, through the watertight sockets provided on the flange surfaces of the ballast tank and the buoyancy tank, the cable is sealed through the flange surfaces of the ballast tank and the buoyancy tank, thereby realizing the safe protection of the cable by using the ballast tank and the buoyancy tank. In order to improve the connection accuracy of the upper and lower pipe sections and the safety protection of the watertight socket, two positioning pins are provided on the upper flange of the pipe section, and positioning holes are provided at the corresponding positions on the lower flange.

[0025] The setting of the watertight box allows the electromagnetic components to work in a dry space, improving the insulation performance of the product and also enhancing the safety of the product. Brief Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of a deep-sea mining lifting riser device of the present invention;

[0027] Figure 2 is the front view of the buoyancy pipe section 160 of the present invention;

[0028] Figure 3 is the top view of the buoyancy pipe section 160 of the present invention;

[0029] Figure 4 is the front view of the ballast pipe section 260 of the present invention;

[0030] Figure 5 is the front view of the ballast pipe section 260 at the bottom of the present invention;

[0031] Figure 6 is the schematic diagram of Embodiment 3 of the present invention.

[0032] In the figure: 100, pipe section; 101, watertight socket; 102, upper flange; 103, outer layer pipe; 104, buoyancy tank; 105, inner layer pipe; 106, pipe hole; 107, positioning pin hole; 108, protection hole; 109, ; 110, lower flange; 111, gasket; 112, positioning pin; 114, cable; 115, watertight plug; 116, watertight sensor; 120, bolt hole; 160, buoyancy pipe section; 161, flange gasket;

[0033] 201, water injection port; 202, drain port; 203, ballast tank; 204, water injection solenoid valve; 205, drain solenoid valve; 211, first water injection port; 212, first drain port; 213, first ballast tank; 214, first water injection solenoid valve; 215, first drain solenoid valve; 216, first water injection / drain port; 221, second water injection port; 222, second drain port; 223, second ballast tank; 224, second water injection solenoid valve; 225, second drain solenoid valve; 226, second water injection / drain port; 230, watertight box; 231, filter screen; 232, motor; 233, hydraulic pump; 234, check valve; 235, drain opening; 236, liquid level sensor; 260, ballast pipe joint; 270, anchor. Detailed implementation manners

[0034] To make the objectives and technical solutions of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and embodiments:

[0035] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs.

[0036] In the present invention, the meanings of "left, right, up, down, front, and back" refer to that when the reader is facing the attached Figure 1 drawing, the left side of the reader is the left, the right side of the reader is the right, the upper side of the reader is the up, the lower side of the reader is the down, the front side of the paper inside the reader is the front, and the side the reader is facing is the back, rather than specific limitations on the present invention.

[0037] In the present invention, the meaning of "connection" can be a direct connection between components or an indirect connection between components through other components. For the convenience of description, in the present invention, the term "pipe joint" is the general term for "buoyancy pipe joint" and "ballast pipe joint".

[0038] Embodiment 1:

[0039] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown in the figure, a deep-sea mining riser device of the present invention has a riser formed by fixedly connecting multiple pipe sections 100. The pipe section 100 is a double-layer pipe, including an inner pipe 105 and an outer pipe 103. Upper flanges 102 and lower flanges 110 are respectively provided at both ends of the pipe section 100. An annular chamber is formed by welding between the hollow layer between the inner pipe 105 and the outer pipe 103 and between the upper flange 102 and the lower flange 110. Flange screw holes 109 penetrating the flanges are provided on the flange surfaces at the top and bottom of the annular chamber. The flange screw holes 109 on the upper flange 102 are respectively used to install two positioning pins 112 and a watertight socket 101. One end of a cable 114 is connected to the watertight socket 101, and the other end of the cable 114 is connected to a watertight plug 115. Except for the lower flange 110 of the bottom pipe section 100, for the remaining lower flanges 110 corresponding to the upper flange 102, two positioning pin holes 107 and a protection hole 108 capable of penetrating the watertight socket 101 are respectively provided on the flange screw holes 109. The watertight socket 101 is protected by the protection hole 108, and the watertight plug can pass through the protection hole 108. The lower flange 110 of the bottom pipe section 100 is arranged the same as the upper flange 102, such as Figure 5 .

[0040] Before ballasting the riser device, its buoyancy in seawater is greater than its own weight. At the bottom of the riser, an anchor 270 is connected by a chain. When the riser is connected to the mother ship, the anchor 270 is suspended on the lower ballast pipe section 260 and does not contact the seabed. Therefore, when the mother ship needs to move on the sea surface during operation, the anchor 270 has no restraint on the mother ship; when the riser is separated from the mother ship and sinks to the bottom, the anchor 270 sinks to the seabed to restrain the riser from drifting underwater.

[0041] The function of the positioning pin 112 is to ensure the positioning accuracy of the connection between the pipe sections 100 and between the riser and external equipment. Two positioning pins 112 are provided on the upper flange 102 of each pipe section 100, which cooperate with the positioning pin holes 107 on the lower flange 110 of the previous pipe section 100. To avoid positioning errors, the diameters of the two positioning pins 112 are different, and the inner diameters of the positioning pin holes 107 cooperating with them are also different; for the convenience of installation, the heights of the two positioning pins 112 are also set differently, one is high and the other is low. To avoid damaging the watertight socket 101 on the upper flange 102 of the next pipe section 100 when assembling the pipe sections, the height of the shorter positioning pin 112 is set to be greater than the height of the watertight socket 101.

[0042] The specifications and quantities of the watertight sockets 101 are determined according to the cables 114. In this embodiment, there are two cables. Their uses are as follows: one three-core power line cable for the hydraulic pump and one six-core control line cable for the solenoid valve. Therefore, two watertight sockets 101 are provided on the upper flange 102 of each pipe section. More cable watertight sockets and cables can be provided as needed. On the one hand, the watertight socket 101 can enable the cable to pass through the flange surface of the pipe section in a sealed manner. On the other hand, the cable 114 uses the annular chamber of the pipe section as its own protection body, and its safety is more guaranteed.

[0043] The pipe hole 106 in the pipe section 100 is a conveying channel for pulp. To improve its service life, a polymer wear-resistant material is coated in the pipe hole 106. To ensure the seal between the pipe sections 100, a flange gasket 161 is provided at the connection between the upper and lower pipe sections 100, and a gasket 111 is also provided between the mating surfaces of the positioning pins 112, watertight sockets 101 and the flange. Multiple groups of corresponding bolt holes 120 are provided at the edges of the upper flange 102 and the lower flange 110 of the pipe section 100, which facilitates the fixed connection of the pipe sections 100.

[0044] As Figure 2 , Figure 4 shown, if the outer pipe 103 of the pipe section 100 is a closed cylindrical pipe, then this pipe section is called a buoyancy pipe section 160, and its annular chamber is recognized as a buoyancy chamber 104; if the pipe section 100 is provided with a water injection port 201 and a drain port 202 communicating with the annular chamber on the outer pipe 103, then this pipe section is called a ballast pipe section 260, and its annular chamber is recognized as a ballast chamber 203; the water injection port 201 of the ballast pipe section 260 is located in the upper part of the ballast chamber 203, and the drain port 202 is located in the lower part of the ballast chamber 203.

[0045] As Figure 1 , Figure 4 shown, in this embodiment, there are two ballast pipe sections 260, namely the upper ballast pipe section and the lower ballast pipe section. For the convenience of description, the codes of the water injection port 201, drain port 202 and ballast chamber 203 of the ballast pipe section 260 in Figure 4 are distinguished; the water injection port corresponding to the upper ballast pipe section is marked as the first water injection port 211, and by analogy, the first drain port 212, the first ballast chamber 213, the first water injection solenoid valve 214, the first drain solenoid valve 215; the water injection port corresponding to the lower ballast pipe section is marked as the second water injection port 221, and by analogy, the second drain port 222, the second ballast chamber 223, the second water injection solenoid valve 224, the second drain solenoid valve 225.

[0046] As Figure 1As shown in the figure, the water outlet A of the first water injection solenoid valve 214 is connected to the first water injection port 211, and the water outlet A of the second water injection solenoid valve 224 is connected to the second water injection port 221. After the water inlet P of the first water injection solenoid valve 214 is connected to the water inlet P of the second water injection solenoid valve 224, it is then connected to the sea through the filter screen 231. The water inlet P of the first drain solenoid valve 215 is connected to the first drain port 212, and the water inlet P of the second drain solenoid valve 225 is connected to the second drain port 222. After the water outlet A of the first drain solenoid valve 215 is connected to the water outlet A of the second drain solenoid valve 225, it is then connected to the hydraulic pump 233, the check valve 234, the drain port 235 and the sea. The hydraulic pump 233 is driven by the motor 232. The first water injection solenoid valve 214, the first drain solenoid valve 215, the second water injection solenoid valve 224, the second drain solenoid valve 225, the hydraulic pump 233, the motor 232, and the check valve 234 are installed in the watertight box 230. The watertight box 230 is fixedly connected to the lower part of the riser, and the water inlet P of the second drain solenoid valve 225 and the water inlet of the hydraulic pump 233 are not higher than the second drain port 222. The watertight box 230 provides a dry space for the electromagnetic components, improving the use safety of the product.

[0047] Riser heaving and sinking:

[0048] 1. Riser sinking: When the second water injection solenoid valve 224 is energized and conducts, after the second ballast tank 223 is filled, if the sinking depth of the riser is still insufficient, the second water injection solenoid valve 224 is de-energized and closed, and the first water injection solenoid valve 214 is energized and conducts until the sinking requirement is met, and then the first water injection solenoid valve 214 is de-energized and closed.

[0049] 2. Riser floating: The first drain solenoid valve 215 is energized and conducts, the motor 232 is energized, and the hydraulic pump 233 discharges the ballast water in the first ballast tank 213 into the sea through the first drain port 212 - the first drain solenoid valve 215 - the hydraulic pump 233 - the check valve 234 - the drain port 235 until the ballast water in the first ballast tank 213 is emptied, and then the first drain solenoid valve 215 is de-energized and closed; if the riser needs to continue floating, the second drain solenoid valve 225 is energized and conducts, and the hydraulic pump 233 discharges the ballast water in the second ballast tank 223 into the sea through the second drain port 222 - the second drain solenoid valve 225 - the hydraulic pump 233 - the check valve 234 - the drain port 235 until the ballast water in the second ballast tank 223 is emptied, and then the second drain solenoid valve 225 is de-energized and closed; the motor 232 is de-energized, and the hydraulic pump 233 stops working.

[0050] In addition, in order to effectively avoid resonance during the assembly and launching of the lifting riser, before the ballast pipe section 260 is launched, the ballast tank 203 is filled with water. When resonance occurs during the assembly of the lifting riser, by emptying the ballast water in the ballast tank 203 or injecting ballast water into the ballast tank 203, the mass of the lifting riser is changed, thereby changing the natural frequency of the lifting riser, effectively avoiding the resonance frequency range generated during the assembly and launching of the lifting riser, and facilitating the assembly of the lifting riser. In addition, the ballast tank is filled with water on land so as to drain water underwater, achieving the purpose of creating a vacuum in the ballast tank 203 underwater and improving the ballast capacity of the ballast tank 203.

[0051] In this embodiment, a set of spare cables for the power line of the hydraulic pump and the control line of the solenoid valve, and a signal buoy are also provided on the mother ship; when the mother ship is separated from the lifting riser device, the watertight plug of the spare cable is connected to the watertight socket 101 at the upper end of the lifting riser. After the watertight socket of the spare cable is sealed, it is fixed to the signal buoy, and then the signal buoy is put into the sea. The beneficial effects are as follows: 1. The signal buoy marks the position where the lifting riser device sinks to the bottom, facilitating the mother ship to find the position where the lifting riser device sinks to the bottom when it returns. 2. The watertight socket of the spare cable can use the signal buoy to float on the water surface. When the mother ship returns, the watertight socket of the spare cable can be used to connect to the mother ship to control the lifting of the lifting riser device, so that the lifting riser device is reconnected to the mother ship.

[0052] Embodiment 2:

[0053] A marine pulp lifting riser system includes a buoyancy pipe section and a ballast pipe section; it is characterized in that: the lifting riser includes at least one buoyancy pipe section; a watertight sensor is provided at the bottom of the buoyancy tank of each buoyancy pipe section; the lifting riser includes at least one ballast pipe section; a liquid level sensor is provided in the height direction of the ballast tank of each ballast pipe section.

[0054] The watertight sensor is a capacitance sensor.

[0055] The liquid level sensor is a liquid level dry reed tube sensor.

[0056] The signal line cables of the watertight sensor and the liquid level sensor are in the lifting riser, and are transitioned by the watertight socket 101 and the watertight plug 115, sealed through the flanges on each ballast tank 203 and each buoyancy tank 104, and a signal line watertight socket is also provided at the top of the lifting riser, and is connected to the mother ship by using the watertight socket 101.

[0057] The rest is the same as in Embodiment 1.

[0058] An ocean slurry lifting riser system. In each buoyancy chamber 104, a watertight sensor 116 is provided. When the mother ship is operating, it can timely monitor whether the buoyancy chambers 104 in each buoyancy pipe section 160 of the lifting riser are watertight, ensuring the safe operation of the deep-sea mining lifting riser device. Since a watertight sensor 116 is provided in each buoyancy chamber 104 of each buoyancy pipe section 160, through the signal transmitted by the watertight sensor 116, it can be determined whether the buoyancy pipe section 160 corresponding to the watertight sensor 116 is leaking. Through the setting of the watertight sensor 116, not only can the sealing performance of the buoyancy pipe section 160 be judged, but also with the accumulation of certain experience, the overhaul period of the lifting riser can be determined more scientifically.

[0059] In each ballast tank, a liquid level sensor 236 is provided. On the mother ship, it can monitor the water level in each ballast tank 203 of the lifting riser; accurately determine that the lifting riser can sink when it sinks to the bottom and float when it floats, improving the management level of the safe operation of the system.

[0060] In addition, a spare cable for the signal lines of the watertight sensor 116 and the liquid level sensor 236 is added on the mother ship and bound to the above-mentioned signal buoy. So that when the lifting riser sinks and floats, on the mother ship, through this spare cable, the sealing performance of each buoyancy pipe section 160 and the water level in each ballast pipe section 260 can be observed, and the floating situation of the lifting riser can be accurately judged.

[0061] Embodiment 3:

[0062] An ocean floating and sinking type lifting riser, characterized in that: the lower part of the lifting riser at least includes a pipe section with a water injection / drainage port communicating with an annular chamber provided on the outer layer pipe. This pipe section is defined as a ballast pipe section, and its annular chamber is defined as a ballast tank; a driving member for injecting and discharging ballast water is provided on the water injection / drainage port.

[0063] The water injection / drainage port is arranged at the lower part of the ballast pipe section.

[0064] For the driving member, the driving member for injecting ballast water into the ballast tank is a water injection solenoid valve; a filter screen is provided at the water inlet P of the water injection solenoid valve and is communicated with the sea; the water outlet A of the water injection solenoid valve is communicated with the water injection / drainage port of the ballast tank; the driving member for discharging ballast water from the ballast tank is a hydraulic pump. A drainage solenoid valve is provided at the water inlet of the hydraulic pump. The water inlet P of the drainage solenoid valve is also communicated with the water injection / drainage port of the ballast tank. A check valve is provided at the water outlet of the hydraulic pump, and a drain port communicating with the sea is provided at the water outlet of the check valve; the hydraulic pump is driven by an electric motor.

[0065] The rest is the same as Embodiment 2.

[0066] As Figure 6As shown, in this embodiment, there are two ballast pipe sections 260 in total; after the water outlet A of the first water injection solenoid valve 214 is connected to the water inlet P of the first drain solenoid valve 215, it is then connected to the first water injection / drain port 216; after the water outlet A of the second water injection solenoid valve 224 is connected to the water inlet P of the second drain solenoid valve 225, it is then connected to the second water injection / drain port 226; after the water inlet P of the first water injection solenoid valve 214 is connected to the water inlet P of the second water injection solenoid valve 224, it is then connected to the sea through a filter screen 231; after the water outlet A of the first drain solenoid valve 215 is connected to the water outlet A of the second drain solenoid valve 225, it is then connected to a hydraulic pump 233, a check valve 234, a drain port 235 and the sea, and the hydraulic pump 233 is driven by a motor 232. The water inlet P of the second drain solenoid valve 225 and the water inlet of the hydraulic pump 233 are not higher than the second water injection / drain port 226.

[0067] In this embodiment, one water injection port 201 and one drain port 202 in the ballast pipe section 260 are combined into one water injection / drain port and arranged at the lower part of the ballast pipe section 260 to facilitate the drainage of the hydraulic pump; since the lifting riser does not carry out water injection and drainage simultaneously, therefore, one water pipe joint is used to complete the sinking and floating of the lifting riser, thus simplifying the manufacture of the ballast pipe section 260 and at the same time reducing the number of connecting pipes between the ballast pipe section 260 and the watertight box.

Claims

1. A deep-sea mining lifting pipe device, comprising a lifting pipe connected to a pipe-ship connection device of a mother ship, a watertight box, a motor, and a signal buoy; the lifting pipe comprises at least two fixedly connected pipe sections, characterized in that: The pipe section is a double-layer casing, with flanges at both ends of the pipe section, and the hollow layer between the inner and outer pipes and the flanges at both ends are welded to form an annular cabin; the outer pipe is a closed cylindrical pipe, and the pipe section is defined as a buoyancy pipe section, and its annular cabin is defined as a buoyancy cabin; the lower part of the lifting riser includes at least one pipe section with a water injection port and a water discharge port connected to the annular cabin on the outer pipe, and the pipe section is defined as a ballast pipe section, and its annular cabin is defined as a ballast cabin; the water injection port and the water discharge port are provided with driving parts for injecting and discharging ballast water; the lower part of the lifting riser is also provided with an anchor; The inner pores of the inner tube are coated with a wear-resistant material; The ballast pipe section has a water inlet located at the upper part of the ballast tank and a water outlet located at the lower part of the ballast tank; The bottom pipe section of the lifting riser has watertight sockets on the upper and lower flange surfaces of the annular cabin, and the upper and lower watertight sockets are connected to each other by cables; except for the bottom pipe section, the upper flange surface of the annular cabin of the remaining pipe sections of the lifting riser is provided with a watertight socket, and the lower flange surface is correspondingly provided with a watertight socket protection hole penetrating the flange, one end of the cable is connected to the watertight socket, and the other end of the cable is provided with a watertight plug, which passes through the protection hole of the annular cabin; The watertight socket on the top of the lifting riser is connected to the watertight plugs correspondingly arranged on the power system and the control system on the mother ship.

2. A deep sea mining lifting riser device according to claim 1, characterized in that: The lifting riser device is in seawater, and the buoyancy of the ballast pipe section before ballasting is greater than its own weight.

3. A deep sea mining lifting riser device according to claim 1, characterized in that: The driving component for injecting ballast water into the ballast tank is a water injection solenoid valve; the water inlet P of the water injection solenoid valve is provided with a filter and is connected to the sea; the water outlet A of the water injection solenoid valve is connected to the water injection port of the ballast tank; the driving component for discharging ballast water from the ballast tank is a hydraulic pump, the water inlet of the hydraulic pump is provided with a drainage solenoid valve and is connected to the water outlet A of the drainage solenoid valve, the water inlet P of the drainage solenoid valve is connected to the drainage port of the ballast tank, the water outlet A of the hydraulic pump is provided with a one-way valve, and the water outlet of the one-way valve is provided with a drain port and is connected to the sea; the hydraulic pump is driven by a motor.

4. A deep sea mining lifting riser device according to claim 3, characterized in that: The water injection solenoid valve, hydraulic pump, motor, drainage solenoid valve and one-way valve are arranged in a watertight box; the watertight box is fixedly connected to the lower part of the lifting riser, and the water inlet P of the drainage solenoid valve and the water inlet of the hydraulic pump are not higher than the drainage port of the ballast pipe section.

5. A deep sea mining lifting riser device according to claim 1 or claim 3, characterized in that: The cables are power lines of the hydraulic pump and control lines of the solenoid valve.

6. A deep sea mining lifting riser device according to claim 1, characterized in that: The mother ship is also provided with a set of spare cables for hydraulic pump power lines and solenoid valve control lines; the watertight socket at one end of the spare cable is sealed and fixed on the signal buoy, and can be connected with the watertight plugs corresponding to the power system and control system on the mother ship; the watertight plug at the other end of the spare cable can be connected to the watertight socket at the upper end of the lifting riser; when the mother ship evacuates the signal buoy, the watertight plug of the spare cable is connected to the watertight socket at the upper end of the lifting riser, and the signal buoy floats on the sea surface of the lifting riser and can send location information to the outside in a timely manner.

7. A deep sea mining lifting riser device according to claim 1, characterized in that: Two positioning pins are also arranged on the upper flange of each pipe section, and positioning pin holes are correspondingly arranged on the lower flange; and sealing pads are arranged between the pipe sections.

Images