Single-action hydraulic actuator for deep sea

Abstract

The utility model relates to the technical field of actuators, in particular to a single-action hydraulic actuator for deep sea, which comprises a compact cylinder body, the compact cylinder body comprises an oil cylinder body and a half cylinder body, and the oil cylinder body and the half cylinder body are integrally cast and formed. When oil enters the compact cylinder body, the piston rack is pushed to move, the piston rack is meshed with the gear transmission shaft, straight stroke is converted into angular stroke motion, the gear transmission shaft is connected with a valve, and meanwhile hydraulic oil further pushes the spring energy storage mechanism to store energy; during deep sea work, seawater enters the pressure balancer to compress the leather bag, the leather bag is filled with hydraulic oil, the pressure of the hydraulic oil is the same as that of the seawater, and therefore the hydraulic oil is conducted to a cavity at the position of an intermediate gear of the half cylinder body, and the hydraulic oil is discharged from the middle gear of the half cylinder body. And the pressure in the cavity is the same as the pressure of seawater, so that the actuator works in a balance environment without pressure difference.

Description

Technical Field

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

[0002] Deep-sea oil and gas resources refer to fossil energy resources buried in deep-sea sedimentary rocks and bedrock, mainly including oil and natural gas. The global marine oil and gas resource potential is huge. Deep-sea oil and gas resources are an important area for the future replacement of global oil and gas resources. With the increasing depletion of terrestrial oil and gas resources, the importance of deep-sea oil and gas resources will become more prominent. Deep-sea oil and gas pipelines refer to pipeline systems used to transport deep-sea oil and gas resources. Deep-sea oil and gas pipelines are an important link connecting deep-sea oil and gas fields with land or offshore processing facilities.

[0003] In deep-sea oil and gas exploration, actuators are widely used in the control of various deep-sea oil and gas pipeline valves. In deep-sea oil and gas exploration, actuators need to withstand extremely high water pressure. Therefore, how to improve the pressure resistance of the actuator to ensure its long-term stable operation is one of the problems that need to be solved during the use of deep-sea pipeline valve actuators. To this end, a single-acting hydraulic actuator for deep-sea use is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a single-acting hydraulic actuator for deep sea use, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a single-acting hydraulic actuator for deep-sea use, comprising a compact cylinder body, wherein the compact cylinder body comprises an oil cylinder body and a half-cylinder body, the oil cylinder body and the half-cylinder body are integrally cast, the inner side wall of the half-cylinder body is slidingly connected to a piston rack, the interior of the half-cylinder body is rotatably connected to a gear transmission shaft, the outer side wall of the gear transmission shaft is provided with an internal gear, the internal gear is meshed with the piston rack, a spring energy storage mechanism is provided inside the oil cylinder body, the right end of the spring energy storage mechanism is connected to the left end of the piston rack, and a pressure balancer and a valve position feedback indicator for balancing the pressure difference are provided on the half-cylinder body.

[0006] As a further preferred embodiment of the present technical solution: the pressure balancer includes a double-opening container and a hydraulic oil balance pipe, the double-opening container has a built-in bladder, the bladder is filled with hydraulic oil, the bladder is connected to the outlet of the double-opening container, an inlet is provided on the upper part of the double-opening container, the outlet of the double-opening container is connected to the middle part of the half cylinder body, and a hydraulic oil balance pipe is connected between the double-opening container and the cylinder body.

[0007] As a further preferred embodiment of the present technical solution: the piston rack includes a gear portion and two piston portions, the gear portion and the two piston portions together constitute the piston rack, the piston portion is slidably connected to the inner side wall of the half cylinder body, and the gear portion is meshedly connected to the internal gear.

[0008] As a further preferred embodiment of the present technical solution: the front end of the gear transmission shaft extends out of the half-cylinder body, and an output shaft hole is provided at the front end of the gear transmission shaft.

[0009] As a further preferred embodiment of the present technical solution: the spring energy storage mechanism includes a cylinder piston and a cylinder spring, the right side wall of the cylinder body is slidingly connected with the cylinder piston, the right end of the cylinder piston extends into the interior of the semi-cylinder body, and the right end of the cylinder piston is fixedly connected to the left end of the piston rack.

[0010] As a further preferred embodiment of the present technical solution: a cylinder spring is fixedly connected between the left side wall of the cylinder piston and the inner left side wall of the cylinder body.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] When the compact cylinder body is filled with oil, the utility model pushes the piston rack to move, and the piston rack meshes with the gear transmission shaft, converting the linear motion into angular motion. The gear transmission shaft is connected to the valve, and at the same time, the hydraulic oil also pushes the spring energy storage mechanism to store energy. When the hydraulic oil is discharged, the spring energy storage mechanism releases energy to push the piston rack to move in the opposite direction and make the gear transmission shaft rotate in the opposite direction. When working in the deep sea, seawater enters the pressure balancer to compress 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 half-cylinder body, so that the pressure in the cavity is the same as the seawater pressure. In this way, the actuator works in a balanced environment without pressure difference, preventing seawater from pouring into the actuator. At the same time, when the cylinder body is filled with oil, the oil filled in the cylinder body is caused by the entry of the piston to cause the hydraulic oil to enter the bladder through the external pipe, ensuring that the pressure in the cylinder body is the same as the seawater pressure, and is not affected by the pressure difference. It is resistant to deep sea pressure conditions, has a simple structure, low cost, high stability, and is conducive to ensuring long-term stable operation of the actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0014] Figure 2 This is a front view structural diagram of the utility model;

[0015] Figure 3 This is a schematic cross-sectional view of the utility model;

[0016] Figure 4It is a structural diagram of the piston rack in the utility model.

[0017] In the picture:

[0018] 1. Compact cylinder body; 2. Piston rack; 3. Gear transmission shaft; 4. Internal gear; 5. Output shaft hole; 6. Spring energy storage mechanism; 7. Pressure balancer; 8. Valve position feedback indicator;

[0019] 101. Cylinder body; 102. Half cylinder body;

[0020] 201. Piston part; 202. Gear part;

[0021] 61. Cylinder piston; 62. Cylinder spring;

[0022] 71. Double-opening container; 72. Hydraulic oil balance pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "installed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0025] See also Figure 1-4The utility model provides a technical solution: a single-acting hydraulic actuator for deep sea use, including a compact cylinder body 1, which includes a cylinder body 101 and a half-cylinder body 102. The cylinder body 101 and the half-cylinder body 102 are integrally cast. The inner wall of the half-cylinder body 102 is slidably connected to the piston rack 2, and the interior of the half-cylinder body 102 is rotatably connected to the gear transmission shaft 3. The outer wall of the gear transmission shaft 3 is provided with an internal gear 4, and the internal gear 4 is meshed with the piston rack 2. A spring energy storage mechanism 6 is provided inside the cylinder body 101, and the right end of the spring energy storage mechanism 6 is connected to the left end of the piston rack 2. A pressure balancer 7 and a valve position feedback indicator 8 for balancing the pressure difference are provided on the half-cylinder body 102; the valve position feedback indicator 8 adopts a visible and tactile T-mounted mechanical indicator to avoid the inability to confirm the valve state after the attachment of marine organisms on the seabed, and can also be used to install various sensors to receive the valve position.

[0026] Under the above arrangement, the oil cylinder body 101 and the half cylinder body 102 are integrally cast, and the structure is more compact, which reduces the welding or bolt connection during the installation process, thereby reducing the leakage point of the cylinder body as much as possible, ensuring that the internal hydraulic oil will not overflow or the external seawater will not flow in. When the compact cylinder body 1 is filled with oil, it pushes the piston rack 2 to move, and the piston rack 2 is engaged with the gear transmission shaft 3 to convert the straight stroke into angular stroke motion. The gear transmission shaft 3 is connected to the valve. At the same time, the hydraulic oil also pushes the spring energy storage mechanism 6 to store energy. When the hydraulic oil is discharged, the spring energy storage mechanism 6 releases energy to push the piston rack 2 to move in the opposite direction and make the gear transmission shaft 3 rotate in the opposite direction. When working in the deep sea, seawater enters. The pressure balancer 7 is compressed by 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 half cylinder 102, so that the internal pressure of the cavity is the same as the seawater pressure. In this way, the actuator works in a balanced environment without pressure difference, avoiding seawater from pouring into the actuator. At the same time, when the oil cylinder 101 is filled with oil, the oil filled in the cylinder 101 enters the bladder through the external tube due to the entry of the piston, ensuring that the pressure in the cylinder 101 is the same as the seawater pressure, and is not affected by the pressure difference. It is resistant to deep-sea pressure conditions, has a simple structure, low cost, and high stability, which is conducive to ensuring long-term stable operation of the actuator.

[0027] In this embodiment, specifically: the pressure balancer 7 includes a double-opening container 71 and a hydraulic oil balance pipe 72. The double-opening container 71 has a built-in leather bag filled with hydraulic oil. The leather bag is connected to the outlet of the double-opening container 71. An inlet is provided on the upper part of the double-opening container 71. The outlet of the double-opening container 71 is connected to the middle part of the half-cylinder body 102. A hydraulic oil balance pipe 72 is connected between the double-opening container 71 and the oil cylinder body 101; it is convenient for the hydraulic oil to circulate between the air bag, the oil cylinder body 101 and the half-cylinder body 102. The inlet on the upper part of the double-opening container 71 allows seawater to be directly introduced into the double-opening container 71 when immersed in the seabed.

[0028] In this embodiment, specifically: the piston rack 2 includes a gear portion 202 and two piston portions 201, the gear portion 202 and the two piston portions 201 together constitute the piston rack 2, the piston portion 201 is slidingly connected to the inner wall of the half cylinder body 102, and the gear portion 202 is meshed with the internal gear 4; the overall structure formed by the gear portion 202 and the two piston portions 201 can withstand a large thrust, the gear portion 202 is meshed with the internal gear 4, and when the piston rack 2 is running, the gear set converts the linear motion into angular motion.

[0029] In this embodiment, specifically: the front end of the gear transmission shaft 3 extends out of the half cylinder body 102 , and the front end of the gear transmission shaft 3 is provided with an output shaft hole 5 ; the output shaft hole 5 is used to connect the valve and the gear transmission shaft 3 .

[0030] In this embodiment, specifically: the spring energy storage mechanism 6 includes a cylinder piston 61 and a cylinder spring 62, the right side wall of the cylinder body 101 is slidingly connected with the cylinder piston 61, the right end of the cylinder piston 61 extends into the interior of the half cylinder body 102, and the right end of the cylinder piston 61 is fixedly connected to the left end of the piston rack 2.

[0031] In this embodiment, specifically: a cylinder spring 62 is fixedly connected between the left side wall of the cylinder piston 61 and the inner left side wall of the cylinder body 101 ; when oil is introduced into the cylinder body 101 , the cylinder spring 62 is compressed to store energy.

[0032] The hydraulic actuator can be operated by an underwater centralized controller, or the deep-sea valve can be controlled from the surface using an umbilical cable.

[0033] The working principle of the utility model is as follows: when the compact cylinder 1 is filled with oil, it pushes the piston rack 2 to move, and the piston rack 2 is engaged with the gear transmission shaft 3 to convert the linear motion into angular motion. The gear transmission shaft 3 is connected to the valve. At the same time, the hydraulic oil also pushes the spring energy storage mechanism 6 to store energy. When the hydraulic oil is discharged, the spring energy storage mechanism 6 releases energy to push the piston rack 2 to move in the opposite direction and make the gear transmission shaft 3 rotate in the opposite direction. When working in the deep sea, seawater enters the pressure balancer 7 to compress the bladder. Since the bladder is filled with hydraulic oil, the pressure of the hydraulic oil is equal to the pressure of the seawater. The force is the same, so the hydraulic oil is transmitted to the cavity at the intermediate gear of the half cylinder 102, making the internal pressure of the cavity the same as the seawater pressure, so that the actuator works in a balanced environment without pressure difference, avoiding seawater from pouring into the actuator. At the same time, when the cylinder 101 is filled with oil, the oil filled in the cylinder 101 enters the bladder through the external tube due to the entry of the piston, ensuring that the pressure in the cylinder 101 is the same as the seawater pressure, without being affected by the pressure difference, and resistant to deep-sea pressure conditions. It has a simple structure, low cost, and high stability, which is conducive to ensuring long-term stable operation of the actuator.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-acting hydraulic actuator for deep sea use, characterized by: The invention comprises a compact cylinder body (1), wherein the compact cylinder body (1) comprises an oil cylinder body (101) and a half cylinder body (102), wherein the oil cylinder body (101) and the half cylinder body (102) are integrally cast, wherein the inner side wall of the half cylinder body (102) is slidably connected to a piston rack (2), wherein the interior of the half cylinder body (102) is rotatably connected to a gear transmission shaft (3), wherein the outer side wall of the gear transmission shaft (3) is provided with an internal gear (4), wherein the internal gear (4) is meshedly connected to the piston rack (2), wherein a spring energy storage mechanism (6) is provided inside the oil cylinder body (101), wherein the right end of the spring energy storage mechanism (6) is connected to the left end of the piston rack (2), and wherein the half cylinder body (102) is provided with a pressure balancer (7) for balancing the pressure difference and a valve position feedback indicator (8).

2. The deep-sea single-acting hydraulic actuator according to claim 1, characterized in that: The pressure balancer (7) comprises a double-opening container (71) and a hydraulic oil balance pipe (72). The double-opening container (71) has a built-in bladder filled with hydraulic oil. The bladder is connected to the outlet of the double-opening container (71). An inlet is provided at the top of the double-opening container (71). The outlet of the double-opening container (71) is connected to the middle of the half cylinder (102). A hydraulic oil balance pipe (72) is connected between the double-opening container (71) and the oil cylinder (101).

3. The deep-sea single-acting hydraulic actuator according to claim 2, characterized in that: The piston rack (2) comprises a gear portion (202) and two piston portions (201), wherein the gear portion (202) and the two piston portions (201) together constitute the piston rack (2), wherein the piston portion (201) is slidably connected to the inner side wall of the half cylinder (102), and the gear portion (202) is meshedly connected to the internal gear (4).

4. The deep-sea single-acting hydraulic actuator according to claim 3, characterized in that: The front end of the gear transmission shaft (3) extends out of the half cylinder (102), and the front end of the gear transmission shaft (3) is provided with an output shaft hole (5).

5. The deep-sea single-acting hydraulic actuator according to claim 4, characterized in that: The spring energy storage mechanism (6) comprises an oil cylinder piston (61) and an oil cylinder spring (62). The right side wall of the oil cylinder body (101) is slidably connected to the oil cylinder piston (61). The right end of the oil cylinder piston (61) extends into the interior of the half cylinder body (102). The right end of the oil cylinder piston (61) is fixedly connected to the left end of the piston rack (2).

6. The deep-sea single-acting hydraulic actuator according to claim 5, characterized in that: A cylinder spring (62) is fixedly connected between the left side wall of the cylinder piston (61) and the inner left side wall of the cylinder body (101).

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