Double-acting hydraulic actuator for deep sea

Abstract

The double-acting hydraulic actuator comprises a compact type cylinder body, a piston rack, a gear transmission shaft, a pressure balancer, an integrated hydraulic pipeline and a valve position feedback indicator, the integrated hydraulic pipeline is arranged in the middle of the side face of the compact type cylinder body, and the two ends of the integrated hydraulic pipeline are connected to the two sides of the compact type cylinder body respectively. The piston rack is movably arranged in the compact type cylinder body, the gear transmission shaft is rotationally arranged in the compact type cylinder body and connected to the piston rack in a meshed mode, and the pressure sensor is connected to the side face, away from the integrated hydraulic pipeline, of the compact type cylinder body. The valve position feedback indicator is arranged at the end, close to the pressure balancer, of the top of the compact cylinder body. The deep sea actuator can meet the requirements of deep sea oil and gas field development and scientific research in China at present. The existing design of the hydraulic actuator can meet the engineering working condition of 3000-meter water depth underwater. The underwater integrated controller can be used for operation, and an umbilical cable can also be used for controlling the deep sea valve from the water.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic actuators, in particular to a double-acting hydraulic actuator for deep sea use. Background Art

[0002] Marine oil and gas resources are abundant, and the ability to develop deep-sea resources is a reflection of a nation's national strength. In recent years, as the nation's call for deep-sea development has been gradually implemented, domestic demand for valves and actuators for deep-sea pipelines has also increased. Currently, actuators for submarine pipeline valves are hydraulically operated and are primarily manufactured in Europe and the United States. These actuators are sold in China at high prices, and technical support comes with a degree of technical protection.

[0003] In the deep sea, the deeper you go, the greater the pressure. At 3,000 meters underwater, deep-sea actuators are subjected to 300 kilograms of pressure per square centimeter. Conventional actuators would be completely crushed under these conditions. Therefore, double-acting hydraulic actuators were proposed for deep-sea use. Utility Model Content

[0004] The purpose of the utility model is to overcome the problem in the prior art that general actuators will be completely squeezed and crushed under this working condition, and to provide a double-acting hydraulic actuator for deep sea use.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a double-acting hydraulic actuator for deep-sea use, comprising a compact cylinder, a piston rack, a gear transmission shaft, a pressure balancer, an integrated hydraulic pipeline and a valve position feedback indicator. The integrated hydraulic pipeline is arranged in the middle of the side of the compact cylinder. The integrated hydraulic pipeline leads the oil cylinder inlets on both sides of the actuator to an integrated block in the middle of the cylinder through the integrated hydraulic pipeline. In this way, the integrated hydraulic pipeline and the hydraulic cylinder can be connected through a plane and sealed with an O-ring. The installation speed is improved and the risk of leaks is reduced. The two ends of the integrated hydraulic pipeline are respectively connected to the two sides of the compact cylinder. The piston rack is movable and arranged in the compact cylinder. The gear transmission shaft is rotatably arranged in the compact cylinder. The gear transmission shaft is meshed and connected to the piston rack. The pressure balancer is connected and arranged on the side of the compact cylinder away from the integrated hydraulic pipeline. The valve position feedback indicator is arranged at the top of the compact cylinder near one end of the pressure balancer.

[0006] Preferably, an output shaft hole is provided at the lower end of the gear rotating shaft, and the output shaft hole is rotated and penetrates the bottom wall of the compact cylinder body, and the output shaft hole is used to connect the valve.

[0007] Preferably, both sides of the piston rack are in contact with the inner wall of the compact cylinder body, and both sides of the piston rack are respectively facing the connection between the integrated hydraulic pipeline and the compact cylinder body. A gear structure is recessed in the side of the middle part of the piston rack, and the gear transmission shaft is meshed and connected to the gear structure.

[0008] Preferably, the connection between the gear rotating shaft and the piston rack is filled with hydraulic oil.

[0009] Preferably, the pressure balancer is provided with an opening and an inlet, and a bladder is built into the pressure balancer, the bladder is connected to the outlet, and the bladder is connected to the compact cylinder and is arranged opposite to the gear transmission shaft.

[0010] The beneficial effects of the utility model are:

[0011] The present invention is provided with a pressure balancer, which allows seawater to be directly introduced into the interior when immersed in the seabed. When in use, the outlet of the pressure balancer is connected to the middle of the actuator cylinder, and the middle of the actuator is filled with water-based hydraulic oil until the bladder expands to half its volume. When working in the deep sea, seawater enters the pressure balancer and compresses the bladder. Since the bladder is filled with hydraulic oil, the pressure of the hydraulic oil is the same as the seawater pressure. In this way, the hydraulic oil is transmitted to the cavity at the intermediate gear of the hydraulic cylinder, making the internal pressure of the cavity the same as the seawater pressure. In this way, the actuator works in a balanced environment without pressure difference, realizing deep-sea operation, and solving the problem raised in the background technology that the general actuator will be completely squeezed and crushed under such working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the double-acting hydraulic actuator for deep sea use of the utility model.

[0013] Figure 2 This is a bottom view of the structure of the double-acting hydraulic actuator for deep sea use according to the present invention.

[0014] Figure 3 This is a diagram of the internal structure of a double-acting hydraulic actuator for deep sea use according to the present invention.

[0015] In the figure: 1. Compact cylinder body; 2. Piston rack; 3. Gear drive shaft; 4. Pressure balancer; 5. Integrated hydraulic pipeline; 6. Valve position feedback indicator; 7. Output shaft hole. DETAILED DESCRIPTION

[0016] The following is combined with Figure 1-3 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, specific orientation structure and operation, and therefore cannot be understood as a limitation on the present invention.

[0018] This embodiment provides a double-acting hydraulic actuator for deep-sea use, comprising a compact cylinder body 1, a piston rack 2, a gear transmission shaft 3, a pressure balancer 4, an integrated hydraulic pipeline 5, and a valve position feedback indicator 6. The compact cylinder body 1 is a cast cylinder body in which the cylinders for forward and reverse operation are machined. This makes the structure more compact and reduces welding or bolting during the installation process, thereby minimizing leak points in the cylinder body and ensuring that internal hydraulic oil does not overflow or external seawater does not intrude. The integrated hydraulic pipeline 5 is located in the middle of the side of the compact cylinder body 1, and the two ends of the integrated hydraulic pipeline 5 are respectively connected to the two sides of the compact cylinder body 1. The piston rack 2 is movably disposed within the compact cylinder body 1, and the gear transmission shaft 3 is rotatably disposed within the compact cylinder body 1. The gear transmission shaft 3 is meshedly connected to the piston rack 2. When the piston rack 2 operates, the gear set converts linear motion into angular motion, which is output through the gear transmission shaft 3. The pressure balancer 4 is connected to the side of the compact cylinder body 1 away from the integrated hydraulic pipeline 5. The valve position feedback indicator 6 is located at the top of the compact cylinder body 1, near the end of the pressure balancer 4.

[0019] In one embodiment, specifically, an output shaft hole 7 is provided at the lower end of the gear transmission shaft 3 , and the output shaft hole 7 is rotatably arranged to penetrate the bottom wall of the compact cylinder body 1 .

[0020] In one embodiment, specifically, both sides of the piston rack 2 are in contact with the inner wall of the compact cylinder body 1, and both sides of the piston rack 2 are respectively facing the connection between the integrated hydraulic pipeline 5 and the compact cylinder body 1. A gear structure is recessed in the middle side of the piston rack 2, and the gear transmission shaft 3 is meshed and connected to the gear structure.

[0021] In one embodiment, specifically, the connection between the gear transmission shaft 3 and the piston rack 2 is filled with hydraulic oil.

[0022] In one embodiment, specifically, the pressure balancer 4 is provided with an opening and an inlet, and a bladder is built into the pressure balancer 4 . The bladder is connected to the outlet, and the bladder is connected to the compact cylinder body 1 and is arranged opposite to the gear transmission shaft 3 .

[0023] In one embodiment, the valve position feedback indicator 6 is a mechanical indicator that is visible and tactile, so as to avoid the inability to confirm the valve status after marine organisms attach to the seabed. It can also be used to install various sensors to receive valve position information.

[0024] The deep-sea double-acting hydraulic actuator in this embodiment operates as follows: When submerged in the seabed, seawater can be directly introduced into the actuator. During operation, the outlet of the pressure balancer 4 is connected to the center of the actuator's compact cylinder. This center is filled with water-based hydraulic oil until the bladder expands to half its capacity. During deep-sea operation, seawater enters the pressure balancer 4 and compresses the bladder. Because the bladder is filled with hydraulic oil, the pressure of the hydraulic oil equalizes with the seawater pressure. This hydraulic oil is then transferred to the cavity at the intermediate gear of the hydraulic cylinder, equalizing the internal pressure of the cavity with the seawater pressure. This allows the actuator to operate in a balanced environment with no pressure differential.

[0025] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A double-acting hydraulic actuator for deep sea use, characterized in that: The invention comprises a compact cylinder (1), a piston rack (2), a gear transmission shaft (3), a pressure balancer (4), an integrated hydraulic pipeline (5) and a valve position feedback indicator (6), wherein the integrated hydraulic pipeline (5) is arranged in the middle of the side of the compact cylinder (1), and the two ends of the integrated hydraulic pipeline (5) are respectively connected to the two sides of the compact cylinder (1), the piston rack (2) is arranged in a movable manner in the compact cylinder (1), the gear transmission shaft (3) is arranged in a rotational manner in the compact cylinder (1), the gear transmission shaft (3) is meshedly connected to the piston rack (2), the pressure balancer (4) is connected to the side of the compact cylinder (1) away from the integrated hydraulic pipeline (5), and the valve position feedback indicator (6) is arranged at one end of the top of the compact cylinder (1) close to the pressure balancer (4).

2. The deep-sea double-acting hydraulic actuator according to claim 1, characterized in that: An output shaft hole (7) is provided at the lower end of the gear transmission shaft (3), and the output shaft hole (7) is arranged to rotate and penetrate the bottom wall of the compact cylinder body (1).

3. The deep-sea double-acting hydraulic actuator according to claim 1, characterized in that: Both sides of the piston rack (2) are in contact with the inner wall of the compact cylinder (1), and both sides of the piston rack (2) are respectively opposite to the connection between the integrated hydraulic pipeline (5) and the compact cylinder (1). A gear structure is recessed in the side surface of the middle part of the piston rack (2), and the gear transmission shaft (3) is meshed and connected to the gear structure.

4. The deep-sea double-acting hydraulic actuator according to claim 3, characterized in that: The pressure balancer (4) is provided with an opening and an inlet. A bladder is built into the pressure balancer (4). The bladder is connected to the outlet. The bladder is connected to the compact cylinder (1) and is arranged opposite to the gear transmission shaft.

5. The deep-sea double-acting hydraulic actuator according to claim 4, characterized in that: The connection between the gear transmission shaft (3) and the piston rack (2) and the bladder are filled with hydraulic oil.

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