Oil cylinder used under sea

Abstract

The invention 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 invention relates to the technical field of key underwater components for marine engineering, and in particular to an underwater oil cylinder for the ocean. Background Art

[0002] Submerged cylinders are hydraulic actuators that convert hydraulic energy into mechanical energy and perform linear reciprocating motion. They are commonly used in construction equipment for pushing or lifting. Some equipment for offshore wind power construction, oil and gas development, etc. is located on the seabed or underwater. Therefore, it is necessary for the underwater cylinders to have high corrosion resistance during the construction process, have low-speed and stable motion characteristics, be able to maintain pressure for a long time, and be able to withstand large radial forces in a limited space.

[0003] In the prior art, for the sealing system of the cylinder head, there is generally only a main seal plus a dust ring design between the piston rod and the cylinder head, and the cylinder head body is made of carbon steel with a zinc-nickel layer. However, its sealing groove has the problem of water accumulation and rust in the seawater environment; while the static seal adopts the method of O-ring plus retaining ring, which has a high risk of failure such as distortion during the installation process, and its pressure resistance level is limited to 40MPa; at the same time, the copper plating process is used to improve the radial load-bearing capacity of the piston rod, but the piston rod will wear after long-term use, resulting in inconvenience in maintenance. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an underwater oil cylinder for the ocean, so as to improve the sealing performance and anti-corrosion performance of the oil cylinder underwater, improve the radial load-bearing capacity of the oil cylinder, and improve the low-speed and smooth movement characteristics of the oil cylinder.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical solutions:

[0006] An underwater oil cylinder for use in the ocean, comprising a cylinder bottom, a cylinder body and a cylinder cover arranged in sequence, wherein the cylinder cover is sealed and connected to the cylinder body via a first sealing assembly;

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

[0008] In an exemplary embodiment of the present disclosure, the first sealing assembly includes a dumbbell seal 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 one end of the cylinder cover away from the cylinder bottom.

[0010] In an exemplary embodiment of the present disclosure, the second sealing assembly includes a dust ring, a wiper ring, a sealing ring, a buffer ring, a support sleeve and a first retaining ring;

[0011] The dust ring, the wiper ring, the sealing ring, the buffer ring, the support sleeve and the first retaining ring are arranged in sequence along the direction of the cylinder cover approaching the cylinder bottom.

[0012] In an exemplary embodiment of the present disclosure, the second sealing assembly further includes a first slip ring and a second slip ring;

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

[0014] In an exemplary embodiment of the present disclosure, the third sealing assembly includes 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 circumferential outer wall of the piston, 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 the direction in which the piston is away from the cylinder head;

[0016] A copper layer is plated on the circumferential outer wall of the piston, and the copper layer is located on a side where the main sealing ring and the one-way sealing ring are away from each other.

[0017] In an exemplary embodiment of the present disclosure, the piston rod comprises a cylindrical portion, an arc transition portion, and a ball head portion connected in sequence, and an avoidance boss is provided at one 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 arc transition portion is plated with a nickel-based stainless steel layer, and the ball head is plated with a martensitic stainless steel layer.

[0019] In an exemplary embodiment of the present disclosure, a mounting seat is provided at the top of the cylinder body, a valve block is provided at the top of the mounting seat, the valve block is connected to the rodless chamber of the cylinder body through a first oil pipe, and the valve block is connected to the rod chamber of the cylinder body through a second oil pipe;

[0020] The connections between the first oil pipe and the second oil pipe and the valve block and the cylinder body are respectively covered with butter cloth.

[0021] In an exemplary embodiment of the present disclosure, a protective cover is detachably provided on a side wall of the cylinder bottom away from the cylinder head, a cover plate is detachably provided on one end of the protective cover away from the cylinder bottom, and O-rings are respectively provided between the protective cover and the cylinder bottom and the cover plate;

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

[0023] In an exemplary embodiment of the present disclosure, a test cavity extending along the axis is provided in the piston rod, a mounting groove is provided at one end of the test cavity close to the sensor, a measuring rod is provided at the other end of the displacement sensor, the other end of the measuring rod passes through the cylinder bottom and the mounting groove in sequence, and extends into the test cavity, and a protective cover is detachably provided at the other end of the measuring rod;

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

[0025] In an exemplary embodiment of the present disclosure, a leg assembly is detachably provided on the ball head, and the leg assembly includes legs;

[0026] A spherical groove matching the ball head is provided on the support leg, a pressure plate is detachably provided at one end of the support leg close to the ball head, the ball head is movably installed in the spherical groove through the pressure plate, and an O-ring is provided between the support leg and the pressure plate;

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

[0028] Beneficial effects of the present disclosure:

[0029] (1) The present invention seals the cylinder body and the cylinder head through a first sealing component, seals the cylinder head and the piston rod through a second sealing component, and seals the piston and the cylinder body through a third sealing component, thereby improving the sealing and anti-corrosion performance of the cylinder, reducing the risk of oil cylinder leakage, avoiding seawater intrusion, improving the pressure resistance level and radial load-bearing capacity of the cylinder, reducing wear, and facilitating maintenance.

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

[0031] (3) The present invention enables the oil cylinder to maintain pressure for a long time, and the friction during the movement of the oil cylinder is small, thereby improving the stability of the low-speed movement of the oil cylinder.

[0032] (4) The present invention uses a displacement sensor to monitor the position status of the oil cylinder underwater in real time and can provide real-time signal feedback, which facilitates the use of the oil cylinder underwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0034] Figure 1 This is an overall schematic diagram of an underwater oil cylinder used in the ocean in one embodiment of the present disclosure;

[0035] Figure 2 This is a left view of an underwater oil cylinder used in the ocean in one embodiment of the present disclosure;

[0036] Figure 3 A top view of an underwater oil cylinder used in the ocean in one embodiment of the present disclosure;

[0037] Figure 4 This is a cross-sectional view of an underwater oil cylinder used in the ocean in one embodiment of the present disclosure;

[0038] Figure 5 This is a schematic structural diagram of a first sealing component and a second sealing component in one embodiment of the present disclosure;

[0039] Figure 6 This is a schematic structural diagram of a third sealing assembly in one embodiment of the present disclosure;

[0040] Figure 7 This is a schematic diagram of the structure of a piston rod in one embodiment of the present disclosure.

[0041] Description of reference numerals:

[0042] 1. Cylinder bottom; 2. Cylinder body; 3. Cylinder head; 4. First sealing assembly; 5. Piston; 6. Piston rod; 7. Second sealing assembly; 8. Third sealing assembly; 9. Dumbbell seal; 10. O-ring; 11. Dust ring; 12. Wiper ring; 13. Seal ring; 14. Buffer ring; 15. Support sleeve; 16. First retaining ring; 17. First sliding ring; 18. Second sliding ring; 19. Main sealing ring; 20. One-way sealing ring; 21. Third sliding ring; 22. Fourth sliding ring; 23. Copper layer; 2 4. 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. Watertight joint; 33. Test hole; 34. Socket; 35. Test cavity; 36. Mounting groove; 37. Measuring rod; 38. Protective cover; 39. Second retaining ring; 40. Ring magnet; 41. Copper ring; 42. Support leg; 43. Pressure plate; 44. Oil cup; 45. Overflow valve; 46. Pressure measuring joint; 47. Lifting ear. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0044] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0045] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0046] The present disclosure provides an underwater oil cylinder for use in the ocean. Figures 1 to 7 , including a cylinder bottom 1, a cylinder body 2 and a cylinder cover 3 which are arranged in sequence, the cylinder cover 3 being sealed and connected to the cylinder body 2 via a first sealing assembly 4; a piston 5 and a piston rod 6 connected to the piston 5 are slidably arranged in the cylinder body 2, the piston rod 6 is sealed and matched with the cylinder cover 3 via a second sealing assembly 7, and the piston 5 is sealed and matched with the inner wall of the cylinder body 2 via a third sealing assembly 8.

[0047] In the embodiment of the present disclosure, the oil cylinder used underwater in the ocean is composed of a cylinder bottom 1, a cylinder body 2, a cylinder head 3, a piston 5 and a piston rod 6. The cylinder bottom 1 and the cylinder head 3 are respectively threadedly connected to the two ends of the cylinder body 2. When the cylinder bottom 1 and the cylinder head 3 are installed, the threads are coated with anti-seizure oil. The piston 5 is slidably 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 by at least two screws, and the piston rod 6 and the piston 5 are sealed and connected by an O-ring. The other end of the piston rod 6 extends out of the cylinder body 2 through the cylinder head 3; the cylinder head 3 and the cylinder body 2 are sealed by a first sealing component 4, the piston rod 6 and the cylinder head 3 are sealed by a second sealing component 7, and the piston 5 and the inner wall of the cylinder body 2 are sealed by a third sealing component 8 to reduce the risk of oil cylinder leakage, avoid seawater intrusion, and improve the pressure resistance grade and radial bearing capacity of the oil cylinder; non-curing waterproof glue is applied between the fitting end faces of the cylinder bottom 1, the cylinder head 3 and the cylinder body 2 to further prevent water from entering the oil cylinder.

[0048] Compared with the existing oil cylinder sealing method, the oil cylinder used underwater in the ocean seals the cylinder body and the cylinder head through the first sealing component, seals the cylinder head and the piston rod through the second sealing component, and seals the piston and the cylinder body through the third sealing component, thereby improving the sealing and anti-corrosion performance of the oil cylinder, reducing the risk of oil cylinder leakage, avoiding seawater intrusion, improving the pressure resistance level and radial load-bearing capacity of the oil cylinder, reducing wear and tear, and facilitating maintenance; the oil cylinder can be immersed in seawater for a long time to work stably, and when subjected to a large radial force, its supporting structure can provide sufficient strength support, so that the oil cylinder can withstand a large radial force in a limited space, thereby increasing 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 the low-speed movement of the oil cylinder.

[0049] In one embodiment of the present disclosure, the cylinder head 3 is made of high-strength stainless steel, so that the strength of the cylinder head 3 can be improved to meet the strength requirements of the cylinder head 3.

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

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

[0052] In one embodiment of the present disclosure, see Figure 4 and Figure 5The first sealing assembly 4 includes a dumbbell seal ring 9 and an O-ring 10; the dumbbell seal ring 9 is sleeved on the end of the cylinder head 3 close to the cylinder bottom 1, and the O-ring 10 is sleeved on the end of the cylinder head 3 away from the cylinder bottom 1. In this way, the pressure resistance level of the oil cylinder can be improved, and the sealing performance of the oil cylinder can be improved, so as to prevent the thread teeth of the cylinder head 3 from contacting with seawater, avoid the thread teeth from being corroded by seawater, and improve the service life of the oil cylinder.

[0053] Optionally, the dumbbell seal ring 9 is a main static seal ring. In this way, it is possible to avoid distortion when using the O-ring, thereby causing damage to the O-ring, and at the same time improve the pressure resistance level of the oil cylinder.

[0054] Optionally, the O-ring 10 is a waterproof ring. In this way, it is possible to prevent seawater from entering the cylinder body 2 and prevent the threads on the cylinder body 2 and the cylinder cover 3 from being corroded due to contact with seawater.

[0055] It is understandable that grooves are respectively provided on the circumferential outer walls at both ends of the cylinder cover 3 , the dumbbell sealing ring 9 is installed in the groove of the cylinder cover 3 close to the cylinder bottom 1 , and the O-ring 10 is installed in the groove of the cylinder cover 3 away from the cylinder bottom 1 .

[0056] In one embodiment of the present disclosure, see Figure 4 and Figure 5 The second sealing assembly 7 includes a dust ring 11, a wiper ring 12, a sealing ring 13, a buffer ring 14, a support sleeve 15 and a first retaining ring 16; the dust ring 11, the wiper ring 12, the sealing ring 13, the buffer ring 14, the support sleeve 15 and the first retaining ring 16 are sequentially arranged along the direction of the cylinder head 3 close to the cylinder bottom 1. In this way, redundant sealing and waterproof sealing can be achieved between the cylinder head 3 and the piston rod 6, thereby improving the sealing effect of the oil cylinder, reducing the risk of oil cylinder leakage, and preventing seawater from intruding into the oil cylinder.

[0057] Optionally, the dust 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, that is, the cross-sections of the dust 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 dust ring 11 and the wiper ring 12 are both one-way rings, and the openings of the dust ring 11 and the wiper ring 12 face the direction of the cylinder head 3 away from the cylinder bottom 1 .

[0059] It can be understood that the dust ring 11, the wiper ring 12, the sealing ring 13 and the multiple seals between the cylinder head 3 and the piston rod 6 are used to achieve redundant sealing between the cylinder head 3 and the piston rod 6, improve the sealing performance of the cylinder head 3 and the piston rod 6, and reduce the risk of oil cylinder leakage; the one-way wiper ring 12 can remove the seawater brought back to the cylinder sealing groove and the inside of the cylinder during the retraction of the piston rod 6, and avoid seawater intrusion into the cylinder sealing groove and causing corrosion of the sealing groove.

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

[0061] It can be understood that by means of the detachable support sleeve 15 and the first retaining ring 16, which are sleeved on the piston rod 6, when the cylinder is subjected to a large radial force, the support sleeve 15 and the first retaining ring 16 can provide sufficient strength support, significantly improving the radial bearing capacity of the cylinder in a limited space, and the support sleeve 15 and the first retaining ring 16 are convenient for later maintenance and replacement.

[0062] In one embodiment of the present disclosure, see Figure 4 and Figure 5 The second sealing assembly 7 further includes 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 head 3, the dust ring 11 and the wiper ring 12 are respectively installed 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 installed in the other of the first sliding ring 17 and the second sliding ring 18. In this way, pressure can be applied to the dust ring 11 and the wiper ring 12 and the sealing ring 13 and the buffer ring 14, so that the dust ring 11, the wiper ring 12, the sealing ring 13, the buffer ring 14 and the piston rod 6 are interference-fitted, thereby improving the sealing performance of the assembly of the piston 5 and the piston rod 6.

[0063] In one example, the dust ring 11 and the wiper ring 12 are installed in the first slip ring 17 , and the sealing ring 13 and the buffer ring 14 are installed in the second slip ring 18 .

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

[0065] It can be understood that a plurality of grooves are spaced apart on the circumferential inner wall of the cylinder head 3, the first slide ring 17, the second slide ring 18, the support sleeve 15 and the first retaining ring 16 are sequentially installed in the plurality of grooves, the dust ring 11 and the wiper ring 12 are respectively installed in one of the first slide ring 17 and the second slide ring 18, the sealing ring 13 and the buffer ring 14 are respectively installed in the other of the first slide ring 17 and the second slide ring 18, for example, the dust ring 11 and the wiper ring 12 are respectively installed in the first slide ring 17, and the sealing ring 13 and the buffer ring 14 are respectively installed in the second slide ring 18.

[0066] It should be noted that the number of dust rings 11, wiper rings 12, sealing rings 13, buffer rings 14 and support sleeves 15 is at least one, the number of first slip rings 17 is the same as the sum of the number of dust rings 11 and wiper rings 12, and the number of second slip rings 18 is the same as the sum of the number of sealing rings 13 and buffer rings 14.

[0067] In one embodiment of the present disclosure, see Figure 4 and Figure 6 The third sealing assembly 8 includes a main sealing ring 19 and a one-way sealing ring 20; a third sliding ring 21 and a fourth sliding 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 sliding ring 21 and the fourth sliding ring 22, and the one-way sealing ring 20 is sleeved on the other of the third sliding ring 21 and the fourth sliding ring 22, and the main sealing ring 19 and the one-way sealing ring 20 are sequentially arranged along the direction in which the piston 5 is away from the cylinder head 3. In this way, the risk of oil cylinder leakage can be reduced, the pressure holding capacity of the oil cylinder can be improved, and the friction force during the movement of the oil cylinder can be 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 Sterling sealing ring.

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

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

[0072] Optionally, a copper layer 23 is plated on the circumferential outer wall of the piston 5, 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 can be improved, and the supporting strength of the oil cylinder can be improved.

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

[0074] It can be understood that a plurality of grooves are spaced apart on the circumferential outer wall of the piston 5, the third sliding ring 21 and the fourth sliding ring 22 are sequentially installed in the plurality of grooves, the main sealing ring 19 is sleeved on one of the third sliding ring 21 and the fourth sliding ring 22, and the one-way sealing ring 20 is sleeved on the other of the third sliding ring 21 and the fourth sliding ring 22. For example, the main sealing ring 19 is sleeved on the third sliding ring 21, and the one-way sealing ring 20 is sleeved on the fourth sliding ring 22. Grooves are extended from the outer walls of the main sealing ring 19 and the one-way sealing ring 20, 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 defects in the sealing groove 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 installed thereon, and the number of fourth sliding rings 22 is the same as the number of one-way sealing rings 20 or main sealing rings 19 installed thereon.

[0076] In one embodiment of the present disclosure, see Figure 7 The piston rod 6 includes a cylindrical portion, an arc transition portion, and a ball head portion connected in sequence, and an end of the cylindrical portion away from the ball head portion is provided with an avoidance boss 24. In this way, the piston rod 6 can be conveniently processed and the processing accuracy of the piston rod 6 can be improved.

[0077] Optionally, the surface of the cylindrical portion is plated with a nickel-based hard alloy layer, so as to improve the corrosion resistance and hardness performance of the cylindrical portion.

[0078] Optionally, the surface of the nickel-based hard alloy layer is plated with a hard chromium layer. Thus, by using the hard chromium layer as the contact layer of the sealing component, the difficulty of processing the cylindrical part can be reduced and the movement stability of the oil cylinder can be improved.

[0079] Optionally, the surface of the arc transition portion is plated with a nickel-based stainless steel layer, so that the arc transition portion can be easily processed.

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

[0081] Optionally, the ball head is plated with a martensitic stainless steel layer, so as to improve the corrosion resistance and hardness of the ball head.

[0082] It is understandable that the cylindrical portion of the piston rod 6 is machined by turning, and the avoidance boss 24 is left out during the rough turning of the piston rod 6, and the avoidance boss 24 is not laser clad to ensure that when the chamfering is subsequently performed, turning can be performed without the need for complex profiling grinding, thereby improving the processing technology of the piston rod 6; a nickel-based cemented carbide layer is plated on the surface of the cylindrical portion by laser cladding technology as the bottom layer of the cylindrical portion, thereby meeting the requirements of corrosion resistance and substrate hardness; since the hardness of the nickel-based cemented carbide layer is relatively high and difficult to grind, a layer of hard chromium is electroplated on the surface of the nickel-based cemented carbide layer The hard chrome layer is used as the contact layer of the sealing component to reduce the difficulty of processing the cylindrical part of the piston rod 6. At the same time, the excellent adaptation characteristics between the hard chrome layer and the sealing component can improve the movement stability of the cylinder; the arc transition part is difficult to grind due to its special shape and has no stress requirements. Therefore, a nickel-based stainless steel layer is plated on the surface of the arc transition part by laser cladding process; a martensitic stainless steel layer is plated on the surface of the ball head by laser cladding process. The hardness and corrosion resistance of the martensitic stainless steel layer are moderate, which can take into account both corrosion resistance and processing technology, and realize the processing and forming of the ball head by turning instead of grinding with a high-hardness tool.

[0083] In one embodiment of the present disclosure, see Figures 1 to 4 The top of the cylinder body 2 is provided with a mounting seat 25, and the top of the mounting seat 25 is provided with a valve block 26. The valve block 26 is connected to the rodless chamber of the cylinder body 2 through a first oil pipe 27, and the valve block 26 is connected to the rod chamber of the cylinder body 2 through a second oil pipe 28. The connection between the first oil pipe 27 and the second oil pipe 28 and the valve block 26 and the cylinder body 2 is respectively covered with butter cloth. In this way, the anti-corrosion performance of the connection between the first oil pipe 27 and the second oil pipe 28 and 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 first oil pipe 27 and the second oil pipe 28 are made of 316L stainless steel.

[0085] Optionally, the surfaces of the first oil pipe 27 and the second oil pipe 28 are coated with anti-corrosion paint.

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

[0087] In one embodiment of the present disclosure, see Figures 1 to 4 A protective cover 29 is detachably provided on one side wall of the cylinder bottom 1 away from the cylinder cover 3, and a cover plate 30 is detachably provided on one end of the protective cover 29 away from the cylinder bottom 1. A displacement sensor 31 for measuring the position of the piston 5 is provided in the protective cover 29. In this way, the protective ability of the protective cover 29 to the displacement sensor 31 can be improved, and the position of the oil cylinder can be monitored underwater through the displacement sensor 31, so that the oil cylinder can be used conveniently underwater.

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

[0089] Optionally, the protection cover 29 is connected to the cylinder bottom 1 via a plurality of screws.

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

[0091] Optionally, the material of the protective cover 29 and the cover plate 30 is stainless steel, and the surfaces of the protective cover 29 and the cover plate 30 are 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, an O-ring 10 is provided between the protective cover 29 and the cylinder bottom 1 and the cover plate 30, and a non-curing waterproof glue is applied to the joint surfaces of the protective cover 29, the cylinder bottom 1 and the cover plate 30. In this way, the sealing performance of the protective cover 29 can be improved to prevent seawater from entering and corroding the sealing groove.

[0093] Optionally, a test hole 33 is provided on the outer wall of the protective cover 29, and a screw plug is detachably provided in the test hole 33. In this way, the protective cover 29 is inflated through the test hole 33 to perform an internal pressure test, so as to quickly and accurately detect the leakage point and avoid leakage of the protective cover 29.

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

[0095] In one embodiment of the present disclosure, see Figure 4 A test cavity 35 extending along the axis is provided in the piston rod 6. A mounting groove 36 is provided at one end of the test cavity 35 close to the sensor 31. A measuring rod 37 is provided at the other end of the displacement sensor 31. The other end of the measuring rod 37 passes through the cylinder bottom 1 and the mounting groove 36 in sequence and extends into the test cavity 35. A protective cover 38 is detachably provided at the other end of the measuring rod 37. A second retaining ring 39, an annular magnet 40, and a copper ring 41 are provided in sequence in the mounting groove 36 in a direction away from the sensor 31. 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 can be monitored underwater.

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

[0097] Optionally, the protective cover 38 is connected to the measuring rod 37 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 colinear 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 to prevent oil from entering the test cavity 35 .

[0100] In one embodiment of the present disclosure, see Figures 1 to 4The ball head is detachably provided with a leg assembly, which includes a leg 42; a spherical groove matching the ball head is provided on the leg 42, and a pressure plate 43 is detachably provided at one end of the leg 42 close to the ball head, and the ball head is movably installed in the spherical groove through the pressure plate 43. In this way, the oil cylinder can be kept vertical during underwater extension and retraction, which is convenient for the use of the oil cylinder.

[0101] Optionally, the leg 42 is made of carbon steel, and the spherical groove is treated with a nitriding process. In this way, the hardness of the spherical groove can be lower than the hardness of the ball head, which facilitates the cooperation between the ball head and the leg 42 and improves the anti-corrosion performance of the spherical groove.

[0102] Alternatively, see Figure 4 An O-ring 10 is provided between the leg 42 and the pressure plate 43, and an oil cup 44 connected to the spherical groove is provided on the outer wall of one side of the leg 42. In this way, a sealed space can be formed between the leg 42 and the pressure plate 43, and oil can be easily filled into the sealed space to meet the lubrication and rust prevention requirements, thereby improving the service life of the leg assembly.

[0103] Optionally, a relief valve 45 connected to the spherical groove is provided on the outer wall of the other side of the leg 42. In this way, it is possible to prevent the pressure in the sealed space from being too high after the oil is filled, and facilitate the coordinated use of the ball head and the leg 42.

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

[0105] It should be noted that the spherical tank does not need to be painted.

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

[0107] In one embodiment of the present disclosure, see Figure 1 and Figure 2 At least one lifting lug 47 is provided on at least one of the cylinder bottom 1, the cylinder body 2 and the cylinder cover 3. In this way, it is convenient to lift the oil cylinder and put the oil cylinder into the water or take it out of the water.

[0108] In one example, two lifting ears 47 are provided on the circumferential outer wall of the cylinder bottom 1 .

[0109] Optionally, the two lifting ears 47 are symmetrically arranged, and the two lifting ears 47 are offset in a direction away from the cylinder head 3 .

[0110] In one embodiment of the present disclosure, when the oil cylinder is operated at a water depth of more than 20 meters, a high-pressure resistant non-curing waterproof glue is applied to the joints between the cylinder bottom 1 and the cylinder body 2 and the cylinder cover 3 and the cylinder body 2. In this way, seawater can be isolated to meet the anti-corrosion requirements of the oil cylinder.

[0111] In one embodiment of the present disclosure, when the oil cylinder is operated in a water depth of no more than 20 meters, low-pressure resistant non-curing waterproof glue is applied to the joints between the cylinder bottom 1 and the cylinder body 2 and the cylinder cover 3 and the cylinder body 2. In this way, seawater can be isolated to meet the anti-corrosion requirements of the oil cylinder.

[0112] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. An underwater oil cylinder for use in the ocean, characterized in that: It comprises a cylinder bottom (1), a cylinder body (2) and a cylinder cover (3) which are arranged in sequence, and the cylinder cover (3) is sealedly connected to the cylinder body (2) via a first sealing assembly (4); A piston (5) and a piston rod (6) connected to the piston (5) are slidably arranged in the cylinder body (2); the piston rod (6) is sealed with the cylinder head (3) through a second sealing assembly (7); and the piston (5) is sealed with the inner wall of the cylinder body (2) through a third sealing assembly (8).

2. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: The 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 one end of the cylinder cover (3) away from the cylinder bottom (1).

3. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: The second sealing assembly (7) comprises a dust ring (11), a wiper ring (12), a sealing ring (13), a buffer ring (14), a support sleeve (15) and a first retaining ring (16); The dust ring (11), the wiper ring (12), the sealing ring (13), the buffer ring (14), the support sleeve (15) and the first retaining ring (16) are arranged in sequence along the cylinder cover (3) in a direction close to the cylinder bottom (1).

4. The underwater oil cylinder for use in the ocean according to claim 3, characterized in that: 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 head (3); the dust ring (11) and the wiper ring (12) are respectively installed 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 installed in the other of the first sliding ring (17) and the second sliding ring (18).

5. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: The third sealing assembly (8) comprises a main sealing ring (19) and a one-way sealing ring (20); A third sliding ring (21) and a fourth sliding 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 sliding ring (21) and the fourth sliding ring (22); the one-way sealing ring (20) is sleeved on the other of the third sliding ring (21) and the fourth sliding ring (22); the main sealing ring (19) and the one-way sealing ring (20) are sequentially arranged along a direction in which the piston (5) is away from the cylinder head (3); A copper layer (23) is plated on the circumferential outer wall of the piston (5), and the copper layer (23) is located on a side of the main sealing ring (19) and the one-way sealing ring (20) that are away from each other.

6. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: The piston rod (6) comprises a cylindrical portion, an arc transition portion, and a ball head portion which are connected in sequence, and an avoidance boss (24) is provided at one end of the cylindrical portion away from the ball head portion; 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 arc transition portion is plated with a nickel-based stainless steel layer, and the ball head is plated with a martensitic stainless steel layer.

7. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: A mounting seat (25) is arranged at the top of the cylinder body (2), a valve block (26) is arranged at the top of the mounting seat (25), the valve block (26) is communicated with the rodless chamber of the cylinder body (2) via a first oil pipe (27), and the valve block (26) is communicated with the rod chamber of the cylinder body (2) via a second oil pipe (28); The connection points between the first oil pipe (27) and the second oil pipe (28) and the valve block (26) and the cylinder body (2) are respectively covered with butter cloth.

8. The underwater oil cylinder for use in the ocean according to claim 1, characterized in that: A protective cover (29) is detachably provided on a side wall of the cylinder bottom (1) away from the cylinder cover (3); a cover plate (30) is detachably provided on an end of the protective cover (29) away from the cylinder bottom (1); and O-rings (10) are respectively provided between the protective cover (29) and the cylinder bottom (1) and the cover plate (30); A displacement sensor (31) for measuring the position of the piston (5) is arranged in the protective cover (29), a watertight 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), and a socket (34) electrically connected to the watertight joint (32) is arranged at one end of the displacement sensor (31).

9. The underwater oil cylinder for use in the ocean according to claim 8, characterized in that: A test cavity (35) extending along the axis is provided in the piston rod (6); a mounting groove (36) is provided at one end of the test cavity (35) close to the sensor (31); a measuring rod (37) is provided at the other end of the displacement sensor (31); the other end of the measuring rod (37) passes through the cylinder bottom (1) and the mounting groove (36) in sequence and extends into the test cavity (35); a protective cover (38) is detachably provided at 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 installation groove (36) in a direction away from the sensor (31); the second retaining ring (39), the annular magnet (40), and the copper ring (41) are respectively sleeved on the measuring rod (37).

10. The underwater oil cylinder for use in the ocean according to claim 6, characterized in that: The ball head is detachably provided with a leg assembly, the leg assembly comprising a leg (42); The support leg (42) is provided with a spherical groove matching the ball head, and a pressure plate (43) is detachably provided at one end of the support leg (42) close to the ball head, and the ball head is movably installed in the spherical groove through the pressure plate (43), and an O-ring (10) is provided between the support leg (42) and the pressure plate (43); An oil cup (44) communicating with the spherical groove is arranged on the outer wall of one side of the support leg (42), and an overflow valve (45) communicating with the spherical groove is arranged on the outer wall of the other side of the support leg (42).

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