Hydraulic drive device for underwater valves

Abstract

The present invention discloses an underwater valve hydraulic drive device, comprising a shell and a cylinder body and a top cover arranged at both ends of the shell, a cavity is formed between the shell, the cylinder body and the top cover, a driving rod is arranged in the cavity, and the driving rod comprises an operating rod, a valve stem nut and a piston rod in sequence from top to bottom, a central gear is sleeved on the operating rod, the connecting assembly is used to drive the central gear to rotate, a valve stem nut is sleeved on the lower part of the operating rod, the upper end of the piston rod is fixedly connected to the lower end of the valve stem nut; the operating rod and the central gear are connected by a guide spline, and a transmission thread is arranged between the operating rod and the valve stem nut for transmission; a guide support ring is arranged in the cavity, the lower end of the guide support ring is fixedly connected to the top surface of the cylinder body, and the guide support ring and the valve stem nut are splined.

Description

[0001] This application is a divisional application of the invention patent application with application date of June 30, 2021, application number 2021107353659, and invention name “A hydraulic drive device for an underwater valve”. Technical Field

[0002] The present invention relates to the technical field of underwater valves, and in particular to an underwater valve hydraulic drive device. Background Art

[0003] Subsea valves are a general term for all valves used in underwater pipelines. They are mainly used in underwater manifolds and transmission pipelines in offshore oil and gas projects. The operation modes include hydraulic control, underwater robot (Remote Operated Vehicle, ROV) operation and diver operation. The valve is opened or closed by manipulating the operating lever.

[0004] In the prior art, for example, a utility model application patent with patent application number 201921526688.1 discloses an underwater valve hydraulic driver, which has two driving modes: hydraulic drive and ROV drive. By setting the balancer assembly in the cavity of the driver, the space utilization in the cavity is maximized; by setting the valve stem nut assembly in a combination of multiple components, the operating torque of the driver is reduced and the wear is reduced. However, the hydraulic driver disclosed in the above patent is a compression spring structure. Whether using hydraulic drive or using ROV to drive the valve, the spring will be compressed, which increases the number of compressions on the spring and accelerates the damage rate of the spring; in addition, when using ROV drive, the spring is compressed, which makes the operating torque of the driver large, which is easy to cause damage to the driver and reduce its service life. Summary of the invention

[0005] In view of this, in order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an underwater valve hydraulic drive device, which can prevent the force of the elastic member from acting on the drive chain operated by the ROV when using the ROV operation function, thereby achieving the purpose of using the ROV to operate the valve switch without compressing the elastic member.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A hydraulic drive device for an underwater valve comprises a shell and a cylinder body and a top cover arranged at both ends of the shell, a cavity is formed between the shell, the cylinder body and the top cover, a driving rod is arranged in the cavity, and a connecting assembly for connecting with an underwater robot is arranged on the top cover, characterized in that the driving rod comprises an operating rod, a valve stem nut and a piston rod in sequence from top to bottom, a central gear is sleeved on the operating rod, the connecting assembly is used to drive the central gear to rotate, a valve stem nut is sleeved on the lower part of the operating rod, and the upper end of the piston rod is fixedly connected to the lower end of the valve stem nut; a bearing seat is arranged in the cavity, the bearing seat is sleeved on the outer periphery of the operating rod, an upper support is sleeved on the outer periphery of the bearing seat, the bearing seat and the upper support are located above the valve stem nut, the central gear and the operating rod are key-connected, and at least one elastic member is arranged in the cavity, and the elastic member is located between the cylinder body and the upper support.

[0008] The operating rod, valve stem nut and piston rod are connected in sequence, a bearing seat is set on the operating rod, and then the upper support is set on the bearing seat, so that the upper support is not connected to the piston rod; the central gear and the operating rod are keyed, so that the rotation of the central gear will drive the operating rod to rotate, and the operating rod can make axial movement relative to the central gear; the valve stem nut is set on the lower part of the operating rod, and the two are threadedly connected. The lower end of the valve stem nut is fixedly connected to the upper end of the piston rod, and the rotation of the operating rod will not drive the valve stem nut to rotate. The valve stem nut can only make axial movement, thereby driving the piston rod to move; further, when ROV is driven, the axial movement of the piston rod will not drive the upper support to move, and the elastic member between the cylinder body and the upper support will not be compressed. The integrated design of the drive chain of ROV drive and hydraulic drive has a compact structure and can achieve mutual independence of ROV drive and hydraulic drive.

[0009] According to some preferred embodiments of the present invention, a support seat is provided between the top cover and the shell, the central gear is located between the top cover and the support seat, the bearing seat is located between the top surface of the valve stem nut and the bottom surface of the support seat, and the support seat is fixedly connected to the top cover. The support seat is fixedly connected to the top cover, and a connecting ear is provided on the support seat. The support seat is fixedly connected to the top cover through the connecting ear, and the connecting ear is in contact with the shell. When the ROV operation is performed, due to the relative movement of the operating rod and the valve stem nut, the elastic force of the elastic member directly acts on the support seat through the upper support, and due to the connection relationship between the support seat, the top cover, the shell and the cylinder body, the elastic force of the elastic member is subject to multiple restrictions, and the force of the elastic member will not act on the drive chain of the ROV operation.

[0010] According to some preferred embodiments of the present invention, a guide support ring is provided in the cavity, the lower end of the guide support ring is fixedly connected to the top surface of the cylinder body, and the guide support ring is key-connected to the valve stem nut. The key connection between the guide support ring and the valve stem nut guides the valve stem nut, so that the valve stem nut can only move axially; since the elastic member itself has a certain offset force when it is compressed or reset, the offset force of the elastic member will affect the piston sealing effect, and the setting of the guide support ring and the reinforced guide belt are both conducive to offsetting the offset force of the elastic member, ensuring the centering of the entire drive rod and the effectiveness and reliability of the hydraulic operation function.

[0011] According to some preferred embodiments of the present invention, the guide support ring includes a support ring body and a base, the outer diameter of the support ring body is smaller than the outer diameter of the base, the inner diameter of the support ring body is larger than the outer diameter of the valve stem nut, a channel for axial movement of the valve stem nut is formed in the support ring body, and the upper part of the support ring body is key-connected to the valve stem nut. Since the lower end of the valve stem nut is sleeved on the upper end of the piston rod, the inner diameter of the support ring body is set to be larger than the outer diameter of the valve stem nut, so that a channel is left between the support ring body and the piston rod, which facilitates the movement of the valve stem nut in the channel. Strengthening the setting of the guide belt can further offset the offset force of the elastic member and ensure the centering of the entire drive rod.

[0012] According to some preferred implementation aspects of the present invention, the bearing seat comprises a bearing seat body and an extension portion, the outer diameter of the extension portion is larger than the outer diameter of the bearing seat body, a cavity is formed in the bearing seat body, a through opening is formed at the lower end of the bearing seat body, and the diameter of the through opening is smaller than the diameter of the cavity. The cavity in the bearing seat body can be used to accommodate part of the operating rod.

[0013] According to some preferred embodiments of the present invention, the upper support includes a first step portion and a second step portion, the outer diameter of the second step portion is larger than the outer diameter of the first step portion, the inner diameter of the first step portion is smaller than the outer diameter of the extension portion, and the extension portion is accommodated in a gap formed between the top surface of the first step portion and the inner surface of the second step portion. The outer diameter of the extension portion is larger than the outer diameter of the bearing seat body and the inner diameter of the first step portion is smaller than the outer diameter of the extension portion, and the extension portion is accommodated in a gap formed between the top surface of the first step portion and the inner surface of the second step portion, which is conducive to limiting and fixing the bearing seat so that it will not fall during movement; in addition, during hydraulic drive, the connection between the bearing seat and the upper support enables the movement of the bearing seat to drive the upper support to move synchronously, and the elastic member can be compressed during hydraulic drive. When the pressure is released, the compressed elastic member will be released to drive the drive rod to reset.

[0014] According to some preferred embodiments of the present invention, a first elastic member and a second elastic member are provided in the cavity, one end of the first elastic member acts on the cylinder body, and the other end thereof acts on the second step portion, the upper portion of the second elastic member is sleeved on the lower end portion of the bearing seat body, the lower portion of the second elastic member is sleeved on the support ring body, one end of the second elastic member acts on the base, and the other end thereof acts on the first step portion; the spiral directions of the first elastic member and the second elastic member are opposite. One end of the second elastic member is sleeved on the support ring body to guide and limit the movement of the elastic member, which is beneficial to offset the offset force of the second elastic member; using two sets of elastic members with opposite spiral directions is beneficial to offset the relative rotation effect of the elastic members when they are compressed.

[0015] According to some preferred implementation aspects of the present invention, the operating rod includes an upper rod, a middle rod and a lower rod from top to bottom, the outer diameter of the middle rod is larger than the outer diameters of the upper rod and the lower rod, the outer diameter of the middle rod is larger than the diameter of the through port, and the middle rod is accommodated in the cavity; the outer periphery of the upper rod is sleeved with a central gear, the outer periphery of the lower rod is sleeved with a valve stem nut, and bearings are arranged between the outer wall of the middle rod and the inner wall of the bearing seat body, and between the outer wall of one end of the upper rod and the lower rod close to the middle rod and the inner wall of the bearing seat body. The middle rod is accommodated in the cavity and the outer diameter of the middle rod is larger than the diameter of the through port, which is conducive to limiting the operating rod, preventing the operating rod from falling directly from the bearing seat, and synchronizing the movement of the drive rod, the bearing seat and the upper support during hydraulic drive; a bearing is arranged between the bearing seat and the operating rod, which can support the operating rod and reduce the friction coefficient of the operating rod during movement. The central gear and the valve stem nut are respectively sleeved on different positions of the operating rod to avoid interference between them during operation.

[0016] According to some preferred implementation aspects of the present invention, a groove is provided in the cylinder body, a through hole is provided at the top of the cylinder body for the piston rod to pass through, the through hole is connected to the groove, the lower end of the piston rod is accommodated in the groove, a piston is provided between the bottom end of the piston rod and the top surface of the groove, a guide belt is provided on the periphery of the piston, and a piston seal is provided between the piston and the piston rod. The piston and the piston rod are designed in a split type, which can ensure that when the ROV is driven, the driving rod is driven to move through the central gear, so that the piston rod can still perform lifting and lowering movements when there is no hydraulic medium input.

[0017] According to some preferred embodiments of the present invention, the connection assembly includes an interface for connecting to an underwater robot, a control shaft connected to the central gear, and a sealing ring between the control shaft and a top cover. The top end of the control shaft passes through the top cover, and a transmission gear for driving the central gear to rotate is provided on the control shaft. When using ROV drive, the ROV is inserted into the ROV interface through the ROV operating tool and aligned with the joint of the control shaft to achieve the purpose of operating the control shaft to rotate, thereby driving the operating rod to rotate. The sealing ring between the operating shaft and the top cover can ensure the sealing between the two, and at the same time avoid wear between the two.

[0018] Due to the adoption of the above technical scheme, compared with the prior art, the underwater valve hydraulic driving device of the present invention has a reasonable structural design, the operating rod, the valve stem nut and the piston rod are connected in sequence, a key connection is arranged between the central gear and the operating rod, the lower end of the valve stem nut is fixedly connected to the upper end of the piston rod, and the rotation of the central gear is utilized to drive the operating rod to rotate, and then drive the valve stem nut to move axially, thereby driving the piston rod to move; since the bearing seat is sleeved on the operating rod and the upper support is sleeved on the bearing seat, the upper support is not connected to the piston rod, and when the ROV is driven, the piston rod will not drive the upper support to move, thereby avoiding compression of the elastic member, reducing the number of compression times of the elastic member, and extending the service life of related components; and it is beneficial to reduce the operating torque when the ROV operates the valve, and improve the operability of the driving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A cross-sectional view of an underwater valve hydraulic drive device in a preferred embodiment of the present invention;

[0021] Figure 2 A top view of an underwater valve hydraulic drive device in a preferred embodiment of the present invention;

[0022] In the attached drawings: 1-housing, 2-cylinder body, 3-top cover, 4-cavity, 5-hydraulic joint, 6-pressure balancing device, 7-operating rod, 8-valve stem nut, 9-piston rod, 10-center gear, 11-bearing seat, 12-upper support, 13-indicator rod, 14-support seat, 15-guide support ring, 16-reinforced guide belt, 17-support ring body, 18-base, 19-bearing seat body, 20-extension part, 21-center rod, 22-through port, 23-first step portion, 24-second step portion, 25-first elastic member, 26-second elastic member, 27-upper rod portion, 28-middle rod portion, 29-lower rod portion, 30-sliding bearing, 31-thrust roller bearing, 32-groove, 33-through hole, 34-piston, 35-guide belt, 36-piston seal, 37-interface, 38-control shaft, 39-sealing ring, 40-pointer, 41-open indication, 42-close indication, 43-indicator cover. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] See also Figure 1-2 The underwater valve hydraulic drive device of this embodiment includes a housing 1, a pressure balancing device 6 fixedly connected to the outer side of the housing 1, a cylinder 2 and a support seat 14 arranged at both ends of the housing 1, and a top cover 3 fixed on the support seat 14, and a connecting assembly for connecting with an underwater robot. A cavity 4 is formed between the housing 1, the cylinder 2 and the support seat 14, and the bottom end of the pressure balancing device 6 is connected to the cavity 4. Two hydraulic joints 5 are arranged on the cylinder 2, and a driving rod, a guide support ring 15, a bearing seat 11 sleeved on the outer periphery of the driving rod, and an upper support 12 sleeved on the outer periphery of the bearing seat 11 are arranged in the cavity 4. The top of the driving rod passes through the support seat 14 upward, and the connecting assembly is used to drive the driving rod to rotate.

[0025] The driving rod includes an operating rod 7, a valve stem nut 8 and a piston rod 9 in order from top to bottom. A connecting ear is provided on the support seat 14, and the support seat 14 is fixedly connected to the top cover 3 through the connecting ear, and the connecting ear is in contact with the housing 1.

[0026] The bearing seat 11 is sleeved on the outer periphery of the operating rod 7, and is located between the top surface of the valve stem nut 8 and the bottom surface of the support seat 14. The outer periphery of the bearing seat 11 is sleeved with an upper support 12. The bearing seat 11 includes a bearing seat body 19 and an extension portion 20. The outer diameter of the extension portion 20 is larger than the outer diameter of the bearing seat body 19. A cavity is provided in the bearing seat body 19. A through opening 22 is provided at the lower end of the bearing seat body 19. The diameter of the through opening 22 is smaller than the diameter of the cavity. The upper support 12 is located above the valve stem nut 8. The upper support 12 includes a first step portion 23 and a second step portion 24. The outer diameter of the second step portion 24 is larger than the outer diameter of the first step portion 23. The inner diameter of the first step portion 23 is smaller than the outer diameter of the extension portion 20. The extension portion 20 is accommodated in the gap formed between the top surface of the first step portion 23 and the inner surface of the second step portion 24.

[0027] In this embodiment, the lower end of the bearing seat body 19 extends downward and protrudes from the bottom surface of the first step portion 23 to guide and limit the movement of the elastic member. The outer diameter of the extension portion 20 is larger than the outer diameter of the bearing seat body 19, the inner diameter of the first step portion 23 is smaller than the outer diameter of the extension portion 20, and the positional relationship between the bearing seat and the upper support is conducive to limiting and fixing the bearing seat 11, so that it will not fall during the movement, ensuring the normal operation of the driving rod; the movement of the bearing seat 11 can drive the upper support 12 to move together, and the elastic member can be compressed during hydraulic drive. When the pressure is released, the compressed elastic member will be released to drive the driving rod to reset.

[0028] The operating rod 7 includes an upper rod portion 27, a middle rod portion 28 and a lower rod portion 29 from top to bottom. The outer diameter of the middle rod portion 28 is larger than the outer diameters of the upper rod portion 27 and the lower rod portion 29, and the outer diameter of the middle rod portion 28 is larger than the diameter of the through opening 22. The middle rod portion 28 is accommodated in the cavity of the bearing seat 11; the outer periphery of the upper rod portion 27 is sleeved with a central gear 10, which is located between the top cover 3 and the support seat 14, and the central gear 10 and the operating rod 7 are connected by a spline, a sliding bearing 30 is arranged between the outer wall of the middle rod 28 and the inner wall of the bearing seat body 19, and a thrust roller bearing 31 is arranged between the outer wall of the upper rod portion 27 and the lower rod portion 29 at one end close to the middle rod portion 28 and the inner wall of the bearing seat body 19, and the sliding bearing 30 is located between the two thrust roller bearings 31, and the outer periphery of the lower rod portion 29 is sleeved with a valve stem nut 8.

[0029] The lower end of the valve stem nut 8 is sleeved on the upper end of the piston rod 9. The guide support ring 15 includes a support ring body 17 and a base 18. The support ring body 17 is fixedly connected to the top surface of the cylinder body 2. The lower part of the valve stem nut 8 is connected to the support ring body 17 through a spline. In this embodiment, the spline connection is set between the upper end of the support ring body 17 and the valve stem nut 8; and the base 18 in this embodiment has a guide portion extending toward one end of the piston rod 9. The guide portion is used to guide the movement of the piston rod 9 on the one hand, and can limit the movement position of the valve stem nut 8 on the other hand to prevent the valve stem nut 8 from excessive downward movement. An "L"-shaped reinforced guide belt 16 is provided between the inner surface and the bottom surface of the guide portion and the outer surface of the piston rod 9 and the top surface of the cylinder body 2, respectively. The outer diameter of the support ring body 17 is smaller than the outer diameter of the base 18, and the inner diameter of the support ring body 17 is larger than the outer diameter of the valve stem nut 8. The valve stem nut 8 moves axially in the channel set in the support ring body 17. The spline between the guide support ring 15 and the valve stem nut 8 guides the valve stem nut 8 so that the valve stem nut 8 can only move axially.

[0030] A groove 32 is provided in the cylinder body 2, and a through hole 33 for the piston rod 9 to pass through is provided on the top of the cylinder body 2. The through hole 33 is connected with the groove 32. A piston 34 is provided between the bottom end of the piston rod 9 and the top surface of the groove 32. A guide belt 35 is provided on the periphery of the piston 34. A piston seal 36 is provided between the piston 34 and the piston rod 9. The piston 34 and the piston rod 9 are of a split design, which is conducive to the piston rod 9 still being able to do lifting and lowering movements when the ROV is driven.

[0031] In the present embodiment, the cavity 4 is provided with a first elastic member 25 and a second elastic member 26, and the first elastic member 25 and the second elastic member 26 are preferably springs. One end of the first elastic member 25 acts on the cylinder body 2, and the other end thereof acts on the second step portion 24. The upper part of the second elastic member 26 is sleeved on the lower end of the bearing seat body 19, and the lower part of the second elastic member 26 is sleeved on the support ring body 17. One end of the second elastic member 26 acts on the base 18, and the other end thereof acts on the first step portion 23. The spiral directions of the first elastic member 25 and the second elastic member 26 are opposite. The selection of two sets of elastic members with opposite spiral directions is conducive to offsetting the relative rotation effect of the elastic members when they are compressed. In addition, the setting of the guide support ring 15 and the reinforced guide belt 16 is conducive to guiding the movement of the piston rod 9, ensuring the centering of the piston rod 9, thereby improving the centering of the entire drive rod, further offsetting the offset force of the first elastic member 25 and the second elastic member 26, and ensuring the effectiveness and reliability of the hydraulic operation function.

[0032] The connection assembly is used to drive the central gear 10 to rotate, and includes an interface 37 for connecting with an underwater robot, a control shaft 38 connected to the central gear 10, and a sealing ring 39 between the control shaft 38 and the top cover 3. The top end of the control shaft 38 passes through the top cover 3, and a transmission gear for driving the central gear 10 to rotate is provided on the control shaft 38. When using ROV drive, the ROV is inserted into the interface 37 through the ROV operating tool and aligned with the joint of the control shaft 38. The ROV drives the operating rod 7 to rotate, and further drives the valve stem nut 8 and the piston rod 9 to move; the sealing ring 39 between the control shaft 38 and the top cover 3 can ensure the sealing between the two, and can also avoid wear between the two.

[0033] This embodiment also includes a switch indicating mechanism of a spiral transmission design, which includes a center rod 21, a pointer 40, an open indication 41, a close indication 42, an indication pressure cap 43, and an indication rod 13 rotatably connected to one end of the pointer 40. The upper end of the switch indicating mechanism passes through the top cover 3, the indication pressure cap 43 is located above the center rod 21, the top of the indication rod 40 passes through the indication pressure cap 43, the indication pressure cap 43 is provided with an open indication 41 and a close indication 42, one end of the pointer 40 is connected to one end of the indication rod 13, and the other end points to the open indication 41 or the close indication 42; the bottom end of the center rod 21 is fixedly connected to the top end of the piston rod 6, and its top end is not connected to the top end of the indication rod 13. Regardless of ROV drive or hydraulic operation, the piston rod 9 will eventually be driven to move, thereby driving the drive rod to move, and the movement of the piston rod 9 will drive the switch indicating mechanism to move, thereby converting the lifting movement of the piston rod 9 into the rotational movement of the pointer 40, and displaying the switch state of the valve through the open indication 41 and the close indication 42 on the top cover 3.

[0034] The working process of the underwater valve hydraulic drive device of this embodiment is briefly described below:

[0035] The underwater valve hydraulic drive device of this embodiment has two driving modes: hydraulic drive and ROV drive. When the device is in use, the hydraulic drive mode is mainly used. In the early stage of using the hydraulic drive device, the hydraulic joint 5 can be connected to the hydraulic pipeline cleaning device to form a complete cycle to flush the hydraulic pipeline. When the hydraulic operation function is used, one end of the hydraulic joint 5 is closed and the other end is connected to the hydraulic pipeline. The hydraulic drive medium of the rated operating force is injected into the cylinder body 2 through the hydraulic joint 5. Through the sealing effect of the piston seal 36 set on the piston 34, the piston 34 is driven to move. The piston 34 exerts the force on the piston rod 9, thereby driving the piston 34 and the piston rod 9 to move up and down, and then drives the valve stem nut 8 and the operating rod 7 to move as a whole, and drives the switch indicating mechanism to move, and indicates the open or closed state of the valve through the direction of the pointer 40. The movement of the piston rod 9 will compress the first elastic member 25 and the second elastic member 26 through the upper support 12. When the pressure is relieved, the hydraulic medium flows back through the hydraulic joint 5, and the first elastic member 25 and the second elastic member 26 will drive the piston rod 9 to reset and move.

[0036] When the hydraulic drive fails midway, the valve can be controlled by ROV drive. The ROV operating tool is inserted into the interface 37 and aligned with the joint of the control shaft 38. The control shaft 38 is provided with a transmission gear. The gear component of the control shaft 38 drives the central gear 10 to rotate. Since the operating rod 7 is connected to the central gear 10 through a guide spline, the operating rod 7 will be driven to rotate without affecting the axial movement of the operating rod 7. The rotation of the operating rod 7 is transmitted through the transmission thread on the valve stem nut 8. Since the valve stem nut 8 is splined with the guide support ring 15, the rotation of the operating rod 7 will not drive the valve stem nut 8 to rotate. The valve stem nut 8 only moves axially under the driving action of the operating rod 7, thereby driving the piston rod 9 to move and controlling the opening and closing of the valve. Under the driving action of ROV, the operating rod 7 and the valve stem nut 8 move relative to each other, so that the elastic force of the first elastic member 25 and the second elastic member 26 directly acts on the support seat 14 through the upper support 12, so that the elastic force is subject to multiple restrictions of the upper support 12, the support seat 14, the cylinder body 2 and the shell 1, and the first elastic member 25 and the second elastic member 26 will not be compressed.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An underwater valve hydraulic drive device, comprising a housing, a cylinder body and a top cover arranged at both ends of the housing, a cavity is formed between the housing, the cylinder body and the top cover, a driving rod is arranged in the cavity, characterized in that: The underwater valve hydraulic drive device also includes a pressure balancing device fixedly connected to the outer side of the housing and a hydraulic joint arranged on the cylinder body, and the bottom end of the pressure balancing device is connected to the cavity; The driving rod includes an operating rod, a valve stem nut and a piston rod from top to bottom, the operating rod is sleeved with a central gear, the top cover is provided with a connecting assembly for driving the central gear to rotate, the lower part of the operating rod is sleeved with a valve stem nut, and the upper end of the piston rod is fixedly connected to the lower end of the valve stem nut; The operating rod and the central gear are connected via a guide spline, and a transmission thread is provided between the operating rod and the valve stem nut for transmission; a guide support ring is provided in the cavity, the lower end of the guide support ring is fixedly connected to the top surface of the cylinder body, and the guide support ring and the valve stem nut are splined.

2. The underwater valve hydraulic drive device according to claim 1, characterized in that: A bearing seat is arranged in the cavity, and the bearing seat is sleeved on the outer periphery of the operating rod. An upper support is sleeved on the outer periphery of the bearing seat. The bearing seat and the upper support are located above the valve stem nut. The central gear is key-connected to the operating rod. At least one elastic member is arranged in the cavity, and the elastic member is located between the cylinder body and the upper support.

3. The underwater valve hydraulic drive device according to claim 1, characterized in that: A support base is arranged between the top cover and the shell, and a connecting ear is arranged on the support base. The support base is fixedly connected to the top cover via the connecting ear, and the connecting ear is in contact with the shell.

4. The underwater valve hydraulic drive device according to claim 1, characterized in that: The guide support ring includes a support ring body and a base, the outer diameter of the support ring body is smaller than the outer diameter of the base, the inner diameter of the support ring body is larger than the outer diameter of the valve stem nut, a channel for axial movement of the valve stem nut is formed in the support ring body, and the upper part of the support ring body is key-connected to the valve stem nut.

5. The underwater valve hydraulic drive device according to claim 4, characterized in that: The base has a guide portion extending toward one end of the piston rod, and a guide belt is arranged between the inner surface and the bottom surface of the guide portion and the outer surface of the piston rod and the top surface of the cylinder body respectively.

6. The underwater valve hydraulic drive device according to claim 2, characterized in that: The bearing seat includes a bearing seat body and an extension portion, the outer diameter of the extension portion is larger than the outer diameter of the bearing seat body, a cavity is opened in the bearing seat body, a through opening is opened at the lower end of the bearing seat body, and the diameter of the through opening is smaller than the diameter of the cavity.

7. The underwater valve hydraulic drive device according to claim 6, characterized in that: The lower end of the bearing seat body extends downward and protrudes from the bottom surface of the first step portion, so as to guide and limit the movement of the elastic member.

8. The underwater valve hydraulic drive device according to claim 6, characterized in that: The operating rod includes an upper rod portion, a middle rod portion and a lower rod portion from top to bottom, the outer diameter of the middle rod portion is larger than the outer diameters of the upper rod portion and the lower rod portion, the outer diameter of the middle rod portion is larger than the diameter of the through opening, and the middle rod portion is accommodated in the cavity; a central gear is sleeved on the outer periphery of the upper rod portion, a valve stem nut is sleeved on the outer periphery of the lower rod portion, bearings are arranged between the outer wall of the middle rod portion and the inner wall of the bearing seat body, and between the outer walls of one end of the upper rod portion and the lower rod portion close to the middle rod portion and the inner wall of the bearing seat body.

9. The underwater valve hydraulic drive device according to claim 8, characterized in that: A sliding bearing is arranged between the outer wall of the middle rod part and the inner wall of the bearing seat body, and thrust roller bearings are arranged between the outer walls of one end of the upper rod part and the lower rod part close to the middle rod part and the inner wall of the bearing seat body, and the sliding bearing is located between the two thrust roller bearings; the valve stem nut is sleeved on the outer periphery of the lower rod part.

10. The underwater valve hydraulic drive device according to any one of claims 1 to 9, characterized in that: A switch indicating mechanism with a spiral transmission design is provided, wherein the switch indicating mechanism comprises a center rod, a pointer, an open indication, a closed indication, an indication pressure cover, and an indication rod rotatably connected to one end of the pointer; the upper end of the switch indicating mechanism passes through a top cover, the indication pressure cover is located above the center rod, the top of the indication rod passes through the indication pressure cover, the open indication and the closed indication are arranged on the indication pressure cover, one end of the pointer is connected to one end of the indication rod, and the other end of the pointer points to the open indication or the closed indication; the bottom end of the center rod is fixedly connected to the top end of a piston rod, and the top end of the center rod is not connected to the top end of the indication rod.

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