Oil cylinder used under sea

Abstract

The utility model provides a marine underwater oil cylinder, and belongs to the technical field of marine engineering underwater key parts. The oil cylinder comprises a cylinder bottom, a cylinder body and a cylinder cover which are sequentially arranged, and the cylinder cover is connected with the cylinder body in a sealed mode through a first sealing assembly. A piston and a piston rod connected to the piston are slidably arranged in the cylinder body, the piston rod is in sealing fit with the cylinder cover through a second sealing assembly, and the piston is in sealing fit with the inner wall of the cylinder body through a third sealing assembly. According to the oil cylinder used under the sea, the sealing performance and the anti-corrosion performance of the oil cylinder are improved, the pressure-resistant grade and the radial bearing capacity of the oil cylinder are improved, the low-speed stable motion characteristic of the oil cylinder is improved, and the service life of the oil cylinder is prolonged.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of key underwater components of ocean engineering, and particularly relates to an oil cylinder for ocean underwater. BACKGROUND

[0002] The underwater oil cylinder is a hydraulic actuator for converting hydraulic energy into mechanical energy and performing linear reciprocating motion, and is a commonly used pushing or lifting construction equipment. Some equipment of offshore wind power construction, oil and gas development and the like is located on the seabed or underwater area, so that the underwater oil cylinder needs to have high corrosion resistance during construction, has low-speed stable motion characteristics, can perform long-time pressure maintaining work, and can bear a large radial force in a limited space.

[0003] In the prior art, for the sealing system of the cylinder cover, only the main seal and the dustproof ring are generally designed between the piston rod and the cylinder cover, the cylinder cover body is made of carbon steel plus a zinc-nickel plated layer, however, the sealing groove thereof rusts in the seawater environment; the static seal adopts the O-ring plus the retainer ring, the installation process thereof has a high risk of failure such as distortion, and the pressure resistance grade thereof is limited to 40 MPa; meanwhile, the copper plating process is adopted to improve the radial bearing capacity of the piston rod, but the piston rod will be worn after long-time use, resulting in inconvenient maintenance. CONTENT OF THE UTILITY MODEL

[0004] The present disclosure aims to overcome the deficiencies of the prior art, provide an oil cylinder for ocean underwater, and realize the improvement of the sealing performance and corrosion resistance of the oil cylinder underwater, the radial bearing capacity of the oil cylinder, and the low-speed stable motion characteristics of the oil cylinder.

[0005] To achieve the above-mentioned utility model purposes, the present disclosure adopts the following technical solutions:

[0006] An oil cylinder for ocean underwater comprises a cylinder bottom, a cylinder body and a cylinder cover arranged in sequence, the cylinder cover is sealed and connected with the cylinder body through a first sealing assembly;

[0007] A piston is slidably arranged in the cylinder body, and a piston rod is connected to the piston, the piston rod is sealed and matched with the cylinder cover through a second sealing assembly, and the piston is sealed and matched with the inner wall of the cylinder body through a third sealing assembly.

[0008] In an exemplary embodiment of the present disclosure, the first sealing assembly comprises a dumbbell sealing ring and an O-ring;

[0009] The dumbbell sealing ring is sleeved on one end of the cylinder cover close to the cylinder bottom, and the O-ring is sleeved on the other end of the cylinder cover away from the cylinder bottom.

[0010] In an example embodiment of the present disclosure, the second sealing assembly comprises a dustproof ring, a wiper ring, a sealing ring, a buffer ring, a support sleeve, and a first blocking ring.

[0011] The dustproof ring, the wiper ring, the sealing ring, the buffer ring, the support sleeve, and the first blocking ring are sequentially arranged along a direction of the cylinder head close to the cylinder bottom.

[0012] In an example embodiment of the present disclosure, the second sealing assembly further comprises a first sliding ring and a second sliding ring.

[0013] The first sliding ring and the second sliding ring are respectively nested on the cylinder head circumferential inner wall, the dustproof ring and the wiper ring are respectively installed in one of the first sliding ring and the second sliding ring, and the sealing ring and the buffer ring are respectively installed in the other of the first sliding ring and the second sliding ring.

[0014] In an example embodiment of the present disclosure, the third sealing assembly comprises a main sealing ring and a one-way sealing ring.

[0015] The third sliding ring and the fourth sliding ring are respectively nested on the piston circumferential outer wall, the main sealing ring is sleeved on one of the third sliding ring and the fourth sliding ring, the one-way sealing ring is sleeved on the other of the third sliding ring and the fourth sliding ring, and the main sealing ring and the one-way sealing ring are sequentially arranged along a direction of the piston away from the cylinder head.

[0016] The copper layer is located on a side away from each other of the main sealing ring and the one-way sealing ring.

[0017] In an example embodiment of the present disclosure, the piston rod comprises a cylindrical portion, a circular arc transition portion, and a ball head portion connected in sequence, and an avoidance boss is arranged at an end of the cylindrical portion away from the ball head portion.

[0018] The surface of the cylindrical portion is plated with a nickel-based hard alloy layer, the surface of the nickel-based hard alloy layer is plated with a hard chromium layer, the surface of the circular arc transition portion is plated with a nickel-based stainless steel layer, and the ball head portion is plated with a martensitic stainless steel layer.

[0019] In an example embodiment of the present disclosure, a mounting seat is arranged at a top end of the cylinder body, a valve block is arranged at a top end of the mounting seat, a first oil pipe is arranged to communicate between the valve block and a rodless cavity of the cylinder body, and a second oil pipe is arranged to communicate between the valve block and a rod cavity of the cylinder body.

[0020] The first oil pipe and the second oil pipe are respectively wrapped with a grease cloth at a connection with the valve block and the cylinder body.

[0021] In an example embodiment of the present disclosure, the cylinder bottom is detachably provided with a protective cover on the side wall away from the cylinder cover, and the protective cover is detachably provided with a cover plate at an end away from the cylinder bottom, and O-rings are arranged between the protective cover and the cylinder bottom and the cover plate, respectively.

[0022] A displacement sensor for measuring the position of the piston is arranged in the protective cover, and a water-tight joint and a test hole are arranged on the outer wall of the protective cover, and a screw plug is detachably arranged in the test hole, and one end of the displacement sensor is provided with a socket electrically connected to the water-tight joint.

[0023] In an example embodiment of the present disclosure, a test cavity extending along the axis is formed in the piston rod, and an installation groove is arranged at an end of the test cavity close to the sensor, and a measuring rod is arranged at the other end of the displacement sensor, and the other end of the measuring rod extends into the test cavity through the cylinder bottom and the installation groove in sequence, and a protective cover is detachably arranged at the other end of the measuring rod.

[0024] The second retainer ring, the annular magnet and the copper ring are arranged in the installation groove in sequence in a direction away from the sensor, and are respectively sleeved on the measuring rod.

[0025] In an example embodiment of the present disclosure, a leg assembly is detachably arranged on the ball head, and the leg assembly comprises a leg.

[0026] A spherical groove matched with the ball head is formed in the leg, and a pressure plate is detachably arranged at an end of the leg close to the ball head, and the ball head is movably installed in the spherical groove through the pressure plate, and an O-ring is arranged between the leg and the pressure plate.

[0027] An oil cup in communication with the spherical groove is arranged on one side of the outer wall of the leg, and an overflow valve in communication with the spherical groove is arranged on the other side of the outer wall of the leg.

[0028] The present disclosure has the following beneficial effects:

[0029] (1) The present disclosure seals the cylinder body and the cylinder cover through the first sealing assembly, seals the cylinder cover and the piston rod through the second sealing assembly, and seals the piston and the cylinder body through the third sealing assembly, thereby improving the sealing and corrosion resistance of the oil cylinder, reducing the risk of oil cylinder leakage, avoiding seawater intrusion, improving the pressure rating and radial bearing capacity of the oil cylinder, and reducing wear and tear, and facilitating maintenance.

[0030] (2) The present disclosure enables the oil cylinder to work stably when immersed in seawater for a long time, and when subjected to a large radial force, the support structure can provide sufficient strength support, so that the oil cylinder can withstand a large radial force in a limited space, thereby improving the service life of the oil cylinder.

[0031] (3) The oil cylinder can be kept for a long time, and the friction during the movement of the oil cylinder is small, so that the stability of the low-speed movement of the oil cylinder is improved.

[0032] (4) The position of the oil cylinder under water is monitored in real time by the displacement sensor, and the signal can be fed back in real time, so that the use of the oil cylinder under water is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0034] Figure 1 For an embodiment of the present disclosure, the overall schematic diagram of the oil cylinder under the ocean water;

[0035] Figure 2 For an embodiment of the present disclosure, the left view of the oil cylinder under the ocean water;

[0036] Figure 3 For an embodiment of the present disclosure, the top view of the oil cylinder under the ocean water;

[0037] Figure 4 For an embodiment of the present disclosure, the cross-sectional view of the oil cylinder under the ocean water;

[0038] Figure 5 For an embodiment of the present disclosure, the structural schematic diagram of the first sealing assembly and the second sealing assembly;

[0039] Figure 6 For an embodiment of the present disclosure, the structural schematic diagram of the third sealing assembly;

[0040] Figure 7 For an embodiment of the present disclosure, the structural schematic diagram of the piston rod.

[0041] Explanation of reference signs:

[0042] 1, cylinder bottom; 2, cylinder body; 3, cylinder cover; 4, first sealing assembly; 5, piston; 6, piston rod; 7, second sealing assembly; 8, third sealing assembly; 9, dumbbell sealing ring; 10, O-ring; 11, dust seal; 12, wiper ring; 13, sealing ring; 14, buffer ring; 15, support sleeve; 16, first blocking ring; 17, first slip ring; 18, second slip ring; 19, main sealing ring; 20, one-way sealing ring; 21, third slip ring; 22, fourth slip ring; 23, copper layer; 24, avoidance boss; 25, mounting seat; 26, valve block; 27, first oil pipe; 28, second oil pipe; 29, protective cover; 30, cover plate; 31, displacement sensor; 32, water-tight joint; 33, test hole; 34, socket; 35, test cavity; 36, mounting groove; 37, measuring rod; 38, protective cover; 39, second blocking ring; 40, annular magnet; 41, copper ring; 42, support leg; 43, pressure plate; 44, oil cup; 45, overflow valve; 46, pressure measuring joint; 47, lifting lug. DETAILED DESCRIPTION

[0043] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Moreover, the figures can not be to scale and some features can be exaggerated to show details of particular implementations. Measures of thicknesses and lengths and the like can not be drawn to scale for clarity.

[0044] Although relative terms such as "upper", "lower", etc. are used herein to describe one component's relationship to another component as the figure is oriented, such terminology is used for convenience only and under the normal usage of the figure at issue. It is to be understood that, if the device of the figure were inverted, then the described "upper" component would become the "lower" component. When a structure is "on" another structure, it can mean that the structure is formed integrally with the other structure or that the structure is "directly" on the other structure or that the structure is "indirectly" on the other structure via another structure.

[0045] The terms "a", "an", "the" and "at least one" are used to mean one or more elements / components / objects; the term "includes" and the variation, means the inclusion of but not limited to; the term "first", "second", and "third" etc. are used only to distinguish one component from another and not to limit their number.

[0046] The embodiment of the present disclosure provides an oil cylinder for underwater of sea, seeFigures 1 to 7 , including the cylinder bottom 1, the cylinder body 2 and the cylinder cover 3 arranged in sequence, the cylinder cover 3 is sealingly connected with the cylinder body 2 through the first sealing assembly 4; the piston 5 is slidingly arranged in the cylinder body 2, and the piston rod 6 is connected to the piston 5; the piston rod 6 is sealingly matched with the cylinder cover 3 through the second sealing assembly 7, and the piston 5 is sealingly matched with the inner wall of the cylinder body 2 through the third sealing assembly 8.

[0047] In the embodiment of the present disclosure, the oil cylinder for the ocean underwater is composed of the cylinder bottom 1, the cylinder body 2, the cylinder cover 3, the piston 5 and the piston rod 6; the cylinder bottom 1 and the cylinder cover 3 are respectively threadedly connected at the two ends of the cylinder body 2, and the threads of the cylinder bottom 1 and the cylinder cover 3 are coated with anti-seizing oil when they are installed; the piston 5 is slidingly installed in the cylinder body 2; one end of the piston rod 6 is threadedly connected to the piston 5; the piston rod 6 and the piston 5 are fixed through at least two screws, and the piston rod 6 and the piston 5 are sealingly connected through an O-ring; the other end of the piston rod 6 extends out of the cylinder body 2 through the cylinder cover 3; the cylinder cover 3 and the cylinder body 2 are sealingly matched through the first sealing assembly 4; the piston rod 6 and the cylinder cover 3 are sealingly matched through the second sealing assembly 7; and the piston 5 and the inner wall of the cylinder body 2 are sealingly matched through the third sealing assembly 8, so as to reduce the risk of oil cylinder leakage, avoid seawater intrusion, improve the pressure resistance level and radial bearing capacity of the oil cylinder; and non-solidified waterproof glue is coated between the abutting end faces of the cylinder bottom 1, the cylinder cover 3 and the cylinder body 2, so as to further prevent water from entering the oil cylinder.

[0048] Compared with the existing oil cylinder sealing method, the oil cylinder for the ocean underwater seals the cylinder body and the cylinder cover through the first sealing assembly, seals the cylinder cover and the piston rod through the second sealing assembly, and seals the piston and the cylinder body through the third sealing assembly, so as to improve the sealing and corrosion resistance of the oil cylinder, reduce the risk of oil cylinder leakage, avoid seawater intrusion, improve the pressure resistance level and radial bearing capacity of the oil cylinder, reduce wear and tear, and facilitate maintenance; the oil cylinder can work stably for a long time when immersed in seawater, and when subjected to a large radial force, the support structure can provide sufficient strength support, so that the oil cylinder can withstand a large radial force in a limited space, thereby improving the service life of the oil cylinder; the oil cylinder can maintain pressure for a long time, and the friction during the movement of the oil cylinder is small, thereby improving the stability of low-speed movement of the oil cylinder.

[0049] In one embodiment of the present disclosure, the cylinder cover 3 is made of high-strength stainless steel. In this way, the strength of the cylinder cover 3 can be improved to meet the strength requirements for use of the cylinder cover 3.

[0050] In one example, the cylinder cover 3 is made of 1.4462 stainless steel.

[0051] In another example, the cylinder cover 3 is made of 1.4418 stainless steel.

[0052] In one embodiment of the present disclosure, referring to Figure 4 and Figure 5The first sealing assembly 4 comprises a dumbbell sealing ring 9 and an O-ring 10. The dumbbell sealing ring 9 is sleeved on one end of the cylinder cover 3 close to the cylinder bottom 1, and the O-ring 10 is sleeved on the other end of the cylinder cover 3 away from the cylinder bottom 1. In this way, the pressure resistance level of the oil cylinder can be improved, the sealing performance of the oil cylinder can be improved, the threads of the cylinder cover 3 are prevented from being in contact with seawater, the threads are prevented from being corroded by seawater, and the service life of the oil cylinder is improved.

[0053] Optionally, the dumbbell sealing ring 9 is a main static sealing ring. In this way, the phenomenon of twisting of the O-ring can be avoided, damage of the O-ring can be avoided, and the pressure resistance level of the oil cylinder can be improved.

[0054] Optionally, the O-ring 10 is a waterproof ring. In this way, the seawater can be prevented from entering the cylinder body 2, and the threads on the cylinder cover 3 and the cylinder body 2 can be prevented from being corroded by seawater.

[0055] It can be understood that grooves are formed on the circumferential outer walls of the two ends of the cylinder cover 3, the dumbbell sealing ring 9 is installed in the groove close to the cylinder bottom 1 of the cylinder cover 3, and the O-ring 10 is installed in the groove away from the cylinder bottom 1 of the cylinder cover 3.

[0056] In an embodiment of the present disclosure, referring to Figure 4 and Figure 5 , the second sealing assembly 7 comprises a dustproof ring 11, a wiper ring 12, a sealing ring 13, a buffer ring 14, a support sleeve 15, and a first stop ring 16. The dustproof ring 11, the wiper ring 12, the sealing ring 13, the buffer ring 14, the support sleeve 15, and the first stop ring 16 are sequentially arranged along the direction of the cylinder cover 3 close to the cylinder bottom 1. In this way, the cylinder cover 3 and the piston rod 6 can be redundantly sealed and waterproofed, the sealing effect of the oil cylinder can be improved, the risk of leakage of the oil cylinder can be reduced, and seawater can be prevented from entering the oil cylinder.

[0057] Optionally, the dustproof ring 11 and the wiper ring 12 are both V-shaped rings, and the sealing ring 13 and the buffer ring 14 are both Y-shaped rings, i.e., the cross sections of the dustproof ring 11 and the wiper ring 12 are V-shaped, and the cross sections of the sealing ring 13 and the buffer ring 14 are Y-shaped.

[0058] Optionally, the dustproof ring 11 and the wiper ring 12 are both one-way rings, and the openings of the dustproof ring 11 and the wiper ring 12 are directed away from the cylinder bottom 1 of the cylinder cover 3.

[0059] It can be understood that the dustproof ring 11, the wiper ring 12, the sealing ring 13, and the buffer ring 14 are used to perform multiple sealing between the cylinder cover 3 and the piston rod 6, the cylinder cover 3 and the piston rod 6 are redundantly sealed, the sealing performance of the cylinder cover 3 and the piston rod 6 is improved, and the risk of leakage of the oil cylinder is reduced; the one-way wiper ring 12 can remove seawater brought back to the sealing groove of the oil cylinder and the inside of the oil cylinder during the retraction of the piston rod 6, and seawater is prevented from entering the sealing groove of the oil cylinder to cause corrosion of the sealing groove.

[0060] Optionally, the support sleeve 15 and the first blocking ring 16 are detachably mounted on the inner wall of the cylinder cover 3, and the support sleeve 15 and the first blocking ring 16 are sleeved on the piston rod 6.

[0061] It can be understood that, by detachably mounting the support sleeve 15 and the first blocking ring 16 on the piston rod 6, the support sleeve 15 and the first blocking ring 16 can provide sufficient strength support when the oil cylinder is subjected to a larger radial force, significantly improving the radial bearing capacity of the oil cylinder in a limited space, and the support sleeve 15 and the first blocking ring 16 are convenient to replace and maintain later.

[0062] In an embodiment of the present disclosure, referring to Figure 4 and Figure 5 , the second sealing assembly 7 further comprises a first sliding ring 17 and a second sliding ring 18; the first sliding ring 17 and the second sliding ring 18 are respectively nested on the circumferential inner wall of the cylinder cover 3, the dustproof ring 11 and the wiper ring 12 are respectively mounted in one of the first sliding ring 17 and the second sliding ring 18, and the sealing ring 13 and the buffer ring 14 are respectively mounted in the other of the first sliding ring 17 and the second sliding ring 18. In this way, pressure can be applied to the dustproof ring 11 and the wiper ring 12 and the sealing ring 13 and the buffer ring 14, so that the dustproof ring 11, the wiper ring 12, the sealing ring 13, the buffer ring 14 and the piston rod 6 are in interference fit, improving the sealing performance of the assembly of the piston 5 and the piston rod 6.

[0063] In an example, the dustproof ring 11 and the wiper ring 12 are mounted in the first sliding ring 17, and the sealing ring 13 and the buffer ring 14 are mounted in the second sliding ring 18.

[0064] In another example, the dustproof ring 11 and the wiper ring 12 are mounted in the second sliding ring 18, and the sealing ring 13 and the buffer ring 14 are mounted in the first sliding ring 17.

[0065] It can be understood that a plurality of grooves are provided on the circumferential inner wall of the cylinder cover 3, and the first sliding ring 17, the second sliding ring 18, the support sleeve 15 and the first blocking ring 16 are sequentially mounted in the plurality of grooves; the dustproof ring 11 and the wiper ring 12 are respectively mounted in one of the first sliding ring 17 and the second sliding ring 18, and the sealing ring 13 and the buffer ring 14 are respectively mounted in the other of the first sliding ring 17 and the second sliding ring 18, for example, the dustproof ring 11 and the wiper ring 12 are respectively mounted in the first sliding ring 17, and the sealing ring 13 and the buffer ring 14 are respectively mounted in the second sliding ring 18.

[0066] It should be noted that the number of the dustproof ring 11, the wiper ring 12, the sealing ring 13, the buffer ring 14 and the support sleeve 15 is at least one; the number of the first sliding ring 17 is the same as the sum of the number of the dustproof ring 11 and the number of the wiper ring 12, and the number of the second sliding ring 18 is the same as the sum of the number of the sealing ring 13 and the number of the buffer ring 14.

[0067] In one embodiment of the present disclosure, referring to Figure 4 and Figure 6 The third sealing assembly 8 comprises a main sealing ring 19 and a one-way sealing ring 20. The piston 5 is provided with a third slip ring 21 and a fourth slip ring 22 on the outer circumferential wall. The main sealing ring 19 is sleeved on one of the third slip ring 21 and the fourth slip ring 22, and the one-way sealing ring 20 is sleeved on the other one of the third slip ring 21 and the fourth slip ring 22. The main sealing ring 19 and the one-way sealing ring 20 are sequentially arranged in the direction away from the cylinder head 3. In this way, the risk of oil cylinder leakage is reduced, the pressure maintaining capacity of the oil cylinder is improved, and the friction during the movement of the oil cylinder is reduced, thereby improving the stability of the low-speed movement of the oil cylinder.

[0068] Optionally, the main sealing ring 19 is a PT ring.

[0069] Optionally, the one-way sealing ring 20 is a Stellite ring.

[0070] In one example, the main sealing ring 19 is sleeved on the third slip ring 21, and the one-way sealing ring 20 is sleeved on the fourth slip ring 22.

[0071] In another example, the main sealing ring 19 is sleeved on the fourth slip ring 22, and the one-way sealing ring 20 is sleeved on the third slip ring 21.

[0072] Optionally, the outer circumferential wall of the piston 5 is plated with a copper layer 23, and the copper layer 23 is located on the side away from the main sealing ring 19 and the one-way sealing ring 20. In this way, the radial bearing capacity of the piston 5 is improved, and the support strength of the oil cylinder is improved.

[0073] Optionally, a groove is provided on the outer circumferential wall of the piston 5, and a copper layer 23 is plated on the surface of the piston 5 by copper plating. In this way, the firmness of the copper layer 23 is improved.

[0074] It can be understood that a plurality of grooves are provided on the outer circumferential wall of the piston 5, and the third slip ring 21 and the fourth slip ring 22 are sequentially installed in the plurality of grooves. The main sealing ring 19 is sleeved on one of the third slip ring 21 and the fourth slip ring 22, and the one-way sealing ring 20 is sleeved on the other one of the third slip ring 21 and the fourth slip ring 22. For example, the main sealing ring 19 is sleeved on the third slip ring 21, and the one-way sealing ring 20 is sleeved on the fourth slip ring 22. The outer wall of the main sealing ring 19 and the one-way sealing ring 20 extends out of the groove, that is, a sealing step is formed between the main sealing ring 19, the one-way sealing ring 20 and the copper layer 23, thereby avoiding the sealing groove defect caused by copper plating defects, and further preventing the risk of sealing failure.

[0075] It should be noted that the number of main sealing rings 19 and one-way sealing rings 20 is at least one, the number of third sliding rings 21 is the same as the number of main sealing rings 19 or one-way sealing rings 20 mounted thereon, and the number of fourth sliding rings 22 is the same as the number of main sealing rings 19 or one-way sealing rings 20 mounted thereon.

[0076] In an embodiment of the present disclosure, referring to Figure 7 The piston rod 6 comprises a cylindrical portion, a circular arc transition portion, and a ball head portion connected in sequence, and the end of the cylindrical portion away from the ball head portion is provided with a relief boss 24. In this way, the piston rod 6 can be conveniently machined, and the machining precision of the piston rod 6 is improved.

[0077] Optionally, the surface of the cylindrical portion is plated with a nickel-based hard alloy layer. In this way, the corrosion resistance and hardness of the cylindrical portion can be improved.

[0078] Optionally, the surface of the nickel-based hard alloy layer is plated with a hard chromium layer. In this way, by taking the hard chromium layer as a sealing component contact layer, the machining difficulty of the cylindrical portion can be reduced, and the movement stability of the oil cylinder is improved.

[0079] Optionally, the surface of the circular arc transition portion is plated with a nickel-based stainless steel layer. In this way, the circular arc transition portion can be conveniently machined.

[0080] In an example, the material of the nickel-based stainless steel layer is a high hardness and corrosion-resistant material 625.

[0081] Optionally, the ball head portion is plated with a martensitic stainless steel layer. In this way, the corrosion resistance and hardness of the ball head portion can be improved.

[0082] It can be understood that the cylindrical portion of the piston rod 6 is machined by turning, the relief boss 24 is left during the rough turning of the piston rod 6, and the relief boss 24 is not laser cladded, so that subsequent chamfering can be turned without using complex profiling grinding machining, and the machining process of the piston rod 6 is improved; the surface of the cylindrical portion is plated with a nickel-based hard alloy layer by using a laser cladding process, so as to serve as a bottom layer of the cylindrical portion, thereby meeting the requirements of corrosion resistance and base material hardness; since the hardness of the nickel-based hard alloy layer is high, it is difficult to grind, and therefore a hard chromium layer is electroplated on the surface of the nickel-based hard alloy layer as a sealing component contact layer, so as to reduce the machining difficulty of the cylindrical portion of the piston rod 6, and at the same time, the movement stability of the oil cylinder is improved through the excellent adaptation characteristics between the hard chromium layer and the sealing component; the surface of the circular arc transition portion is plated with a nickel-based stainless steel layer by using a laser cladding process, because the shape of the circular arc transition portion is special, leading to difficult grinding, and there is no stress requirement; the surface of the ball head portion is plated with a martensitic stainless steel layer by using a laser cladding process, and the hardness and corrosion resistance of the martensitic stainless steel layer are moderate, so as to balance corrosion resistance and machining process, and the ball head portion is machined and formed by turning instead of grinding through a high-hardness tool.

[0083] In an embodiment of the present disclosure, referring to Figures 1 to 4 The cylinder body 2 is provided with a mounting seat 25 at the top end, the mounting seat 25 is provided with a valve block 26 at the top end, the valve block 26 is communicated with the rodless cavity of the cylinder body 2 through a first oil pipe 27, and the valve block 26 is communicated with the rod cavity of the cylinder body 2 through a second oil pipe 28; the connection positions of the first oil pipe 27 and the second oil pipe 28 with the valve block 26 and the cylinder body 2 are respectively wrapped with grease cloth. In this way, the corrosion resistance of the connection positions of the first oil pipe 27 and the second oil pipe 28 with the valve block 26 and the cylinder body 2 can be improved, and the service life of the oil cylinder can be improved.

[0084] Optionally, the material of the first oil pipe 27 and the second oil pipe 28 is 316L stainless steel.

[0085] Optionally, the surface of the first oil pipe 27 and the second oil pipe 28 is coated with anticorrosive paint.

[0086] It can be understood that the cylinder body 2 and the valve block 26 are respectively provided with a clamp sleeve joint, the first oil pipe 27 and the second oil pipe 28 are connected with the valve block 26 and the cylinder body 2 through the joints, the surface of the first oil pipe 27 and the second oil pipe 28 is sprayed with paint for corrosion protection, the joint and other areas where paint is difficult to adhere are wrapped with grease cloth to isolate seawater, and the service life of the oil cylinder is improved.

[0087] In an embodiment of the present disclosure, referring to Figures 1 to 4 The cylinder bottom 1 is provided with a protective cover 29 on the side wall away from the cylinder cover 3, the protective cover 29 is provided with a cover plate 30 at the end away from the cylinder bottom 1, and the protective cover 29 is provided with a displacement sensor 31 for measuring the position of the piston 5. In this way, the protection capability of the protective cover 29 for the displacement sensor 31 can be improved, the position of the oil cylinder under water can be monitored through the displacement sensor 31, and the oil cylinder can be conveniently used under water.

[0088] Optionally, an O-ring 10 is arranged between the displacement sensor 31 and the cylinder bottom 1.

[0089] Optionally, the protective cover 29 and the cylinder bottom 1 are connected through a plurality of screws.

[0090] Optionally, the protective cover 29 and the cover plate 30 are connected through a plurality of screws.

[0091] Optionally, the material of the protective cover 29 and the cover plate 30 is stainless steel, and the surface of the protective cover 29 and the cover plate 30 is sprayed with marine paint. In this way, the service life of the protective cover 29 and the cover plate 30 can be improved.

[0092] Optionally, O-rings 10 are arranged between the protective cover 29 and the cylinder bottom 1 and the cover plate 30, respectively, and the joint surfaces of the protective cover 29 and the cylinder bottom 1 and the cover plate 30 are coated with non-curing waterproof glue. In this way, the sealing property of the protective cover 29 can be improved, and seawater can be prevented from entering the sealing groove and causing rust.

[0093] Optionally, a test hole 33 is arranged on the outer wall of the protective cover 29, and a screw plug is detachably arranged in the test hole 33. In this way, the protective cover 29 can be inflated through the test hole 33 for internal pressure testing, so that the leakage point can be quickly and accurately detected, and leakage of the protective cover 29 can be avoided.

[0094] Optionally, a water-tight joint 32 is arranged on the outer wall of the protective cover 29, one end of the displacement sensor 31 is provided with a socket 34 electrically connected with the water-tight joint 32, and an external cable is electrically connected with the water-tight joint 32 through the water-tight joint 32 and the socket 34. In this way, the cable connected with the displacement sensor 31 can be protected through the wall, and the displacement sensor 31 can be conveniently controlled,

[0095] In an embodiment of the present disclosure, referring to Figure 4 , a test cavity 35 extending along the axis is arranged in the piston rod 6, one end of the test cavity 35 close to the sensor 31 is provided with a mounting groove 36, the other end of the displacement sensor 31 is provided with a measuring rod 37, the other end of the measuring rod 37 sequentially passes through the cylinder bottom 1, the mounting groove 36, and extends into the test cavity 35, and a protective cover 38 is detachably arranged on the other end of the measuring rod 37; a second retaining ring 39, an annular magnet 40, and a copper ring 41 are sequentially arranged in the mounting groove 36 in a direction away from the sensor 31, and the second retaining ring 39, the annular magnet 40, and the copper ring 41 are respectively sleeved on the measuring rod 37. In this way, the stroke of the piston rod 6 can be measured in real time, and the position of the oil cylinder under water can be monitored.

[0096] Optionally, the displacement sensor 31 is a magnetic displacement sensor.

[0097] Optionally, the protective cover 38 and the measuring rod 37 are connected by screws.

[0098] It should be noted that the test cavity 35 is located on the axis of the piston rod 6, and the measuring rod 37 is collinear with the test cavity 35.

[0099] It can be understood that the second retaining ring 39 is used to seal the gap between the measuring rod 37 and the mounting groove 36, so as to prevent oil from entering the test cavity 35.

[0100] In an embodiment of the present disclosure, referring to Figures 1 to 4The ball head is detachably provided with a supporting leg assembly, the supporting leg assembly comprises a supporting leg 42, a spherical groove matched with the ball head is formed on the supporting leg 42, and a pressure plate 43 is detachably arranged at one end of the supporting leg 42 close to the ball head, and the ball head is movably arranged in the spherical groove through the pressure plate 43. In this way, the oil cylinder can be kept vertical during the extension and retraction of the oil cylinder under water, and the use of the oil cylinder is facilitated.

[0101] Optionally, the supporting leg 42 is made of carbon steel, and the spherical groove is treated by a nitriding process. In this way, the hardness of the spherical groove is lower than that of the ball head, the cooperation between the ball head and the supporting leg 42 is facilitated, and the corrosion resistance of the spherical groove is improved.

[0102] Optionally, referring to Figure 4 An O-ring 10 is arranged between the supporting leg 42 and the pressure plate 43, and an oil cup 44 is arranged on the outer wall of one side of the supporting leg 42 and communicated with the spherical groove. In this way, a sealed space is formed between the supporting leg 42 and the pressure plate 43, oil is filled into the sealed space to meet the lubrication and rust prevention requirements, and the service life of the supporting leg assembly is improved.

[0103] Optionally, an overflow valve 45 is arranged on the outer wall of the other side of the supporting leg 42 and communicated with the spherical groove. In this way, the pressure in the sealed space after the oil is filled is prevented from being too high, and the cooperation between the ball head and the supporting leg 42 is facilitated.

[0104] Optionally, the surfaces of the supporting leg 42 and the pressure plate 43 are sprayed with paint.

[0105] It should be noted that the spherical groove does not need to be sprayed with paint.

[0106] In an embodiment of the present disclosure, referring to Figure 1 and Figure 2 At least one pressure measuring connector 46 is arranged on the cylinder bottom 1 and the cylinder body 2 respectively. In this way, the pressure in the oil cylinder can be monitored in real time.

[0107] In an embodiment of the present disclosure, referring to Figure 1 and Figure 2 At least one lifting lug 47 is arranged on at least one of the cylinder bottom 1, the cylinder body 2 and the cylinder cover 3. In this way, the oil cylinder can be hoisted conveniently, and the oil cylinder can be put into water or taken out of water.

[0108] In an example, two lifting lugs 47 are arranged on the circumferential outer wall of the cylinder bottom 1.

[0109] Optionally, the two lifting lugs 47 are symmetrically arranged, and the two lifting lugs 47 are offset away from the cylinder cover 3.

[0110] In an embodiment of the present disclosure, when the oil cylinder is working in a condition of more than 20 meters water depth, high-pressure resistant non-cured waterproof glue is applied at the joint of the cylinder bottom 1 and the cylinder body 2 and the joint of the cylinder cover 3 and the cylinder body 2. In this way, the seawater can be isolated to meet the anticorrosion requirement of the oil cylinder.

[0111] In an embodiment of the present disclosure, when the oil cylinder is working in a condition of not more than 20 meters water depth, low-pressure resistant non-cured waterproof glue is applied at the joint of the cylinder bottom 1 and the cylinder body 2 and the joint of the cylinder cover 3 and the cylinder body 2. In this way, the seawater can be isolated to meet the anticorrosion requirement of the oil cylinder.

[0112] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure that come within the scope of the claims and that the claims be interpreted not to be limited to only the described embodiments. The specification and examples given are intended as illustrative only and not restrictive on the true scope and spirit of the present disclosure.

Claims

1. A cylinder for use in the subsea, characterized in that It includes cylinder bottom (1), cylinder body (2) and cylinder cover (3) arranged in sequence, the cylinder cover (3) is sealedly connected with the cylinder body (2) through first sealing assembly (4); The piston (5) is slidably arranged in the cylinder body (2), and the piston rod (6) connected to the piston (5) is sealingly matched with the cylinder cover (3) through the second sealing assembly (7), and the piston (5) is sealingly matched with the inner wall of the cylinder body (2) through the third sealing assembly (8).

2. The oil cylinder for use in the sea under water according to claim 1, characterized by, The first sealing assembly (4) includes dumbbell sealing ring (9) and O-shaped ring (10); The dumbbell sealing ring (9) is sleeved on one end of the cylinder cover (3) close to the cylinder bottom (1), and the O-shaped ring (10) is sleeved on the other end of the cylinder cover (3) away from the cylinder bottom (1).

3. The oil cylinder for use in the sea under water according to claim 1, characterized by, The second sealing assembly (7) includes dustproof ring (11), wiper ring (12), sealing ring (13), buffer ring (14), support sleeve (15) and first stop ring (16); The dustproof ring (11), wiper ring (12), sealing ring (13), buffer ring (14), support sleeve (15) and first stop ring (16) are sequentially arranged along the direction of the cylinder cover (3) close to the cylinder bottom (1).

4. The oil cylinder for use in the undersea according to claim 3, wherein, The second sealing assembly (7) further includes first slip ring (17) and second slip ring (18); The first slip ring (17) and the second slip ring (18) are respectively nested on the circumferential inner wall of the cylinder cover (3), the dustproof ring (11) and the wiper ring (12) are respectively installed in one of the first slip ring (17) and the second slip ring (18), and the sealing ring (13) and the buffer ring (14) are respectively installed in the other of the first slip ring (17) and the second slip ring (18).

5. The oil cylinder for use in the undersea according to claim 1, wherein, The third sealing assembly (8) includes main sealing ring (19) and one-way sealing ring (20); The third slip ring (21) and the fourth slip ring (22) are respectively nested on the circumferential outer wall of the piston (5), the main sealing ring (19) is sleeved on one of the third slip ring (21) and the fourth slip ring (22), the one-way sealing ring (20) is sleeved on the other of the third slip ring (21) and the fourth slip ring (22), and the main sealing ring (19) and the one-way sealing ring (20) are sequentially arranged along the direction of the piston (5) away from the cylinder cover (3); The circumferential outer wall of the piston (5) is plated with a copper layer (23), and the copper layer (23) is located on the side away from each other of the main sealing ring (19) and the one-way sealing ring (20).

6. The oil cylinder for use in the undersea according to claim 1, wherein, The piston rod (6) includes cylinder portion, arc transition portion and ball head portion connected in sequence, and the cylinder portion is provided with a relief boss (24) at one end away from the ball head portion; The surface of the cylinder portion is plated with a nickel-based hard alloy layer, the surface of the nickel-based hard alloy layer is plated with a hard chromium layer, the surface of the arc transition portion is plated with a nickel-based stainless steel layer, and the ball head portion is plated with a martensitic stainless steel layer.

7. The oil cylinder for use in the undersea according to claim 1, wherein, The cylinder body (2) top is provided with mounting seat (25), the mounting seat (25) top is provided with valve block (26), the valve block (26) with the cylinder body (2) no rod cavity is communicated through first oil pipe (27), the valve block (26) with the cylinder body (2) rod cavity is communicated through second oil pipe (28); The first oil pipe (27) and the second oil pipe (28) are respectively covered with butter cloth at the connection of the valve block (26) and the cylinder body (2).

8. The oil cylinder for use in the undersea according to claim 1, wherein, The cylinder bottom (1) is provided with a protective cover (29) on the side wall away from the cylinder cover (3), and the protective cover (29) is provided with a cover plate (30) on the end away from the cylinder bottom (1). O-rings (10) are arranged between the protective cover (29), the cylinder bottom (1) and the cover plate (30). A displacement sensor (31) is arranged in the protective cover (29) for measuring the position of the piston (5). A water-tight joint (32) and a test hole (33) are arranged on the outer wall of the protective cover (29). A screw plug is detachably arranged in the test hole (33). One end of the displacement sensor (31) is provided with a socket (34) electrically connected with the water-tight joint (32).

9. The oil cylinder for use in the underwater of the sea according to claim 8, wherein, A test cavity (35) extending along the axis is formed in the piston rod (6). An installation groove (36) is arranged at one end of the test cavity (35) close to the sensor (31). A measuring rod (37) is arranged at the other end of the displacement sensor (31). The measuring rod (37) extends into the test cavity (35) through the cylinder bottom (1) and the installation groove (36) in sequence. A protective cover (38) is detachably arranged at the other end of the measuring rod (37). A second retainer ring (39), a ring-shaped magnet (40) and a copper ring (41) are arranged in the installation groove (36) in sequence away from the sensor (31). The second retainer ring (39), the ring-shaped magnet (40) and the copper ring (41) are respectively sleeved on the measuring rod (37).

10. The oil cylinder for use in the undersea environment according to claim 6, wherein, A leg assembly is detachably arranged on the ball head. The leg assembly includes a leg (42). A spherical groove matching the ball head is formed in the leg (42). A pressure plate (43) is detachably arranged at one end of the leg (42) close to the ball head. The ball head is movably installed in the spherical groove through the pressure plate (43). An O-ring (10) is arranged between the leg (42) and the pressure plate (43). An oil cup (44) is arranged on one side of the outer wall of the leg (42) and communicates with the spherical groove. An overflow valve (45) is arranged on the other side of the outer wall of the leg (42) and communicates with the spherical groove.

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