Compensation device for an underwater hydraulic actuator

Abstract

The utility model discloses solve the problem that the compensation device of current underwater actuator's compensation water pressure inside oil pressure and external water pressure balance, influence sealing performance, provide a kind of compensation device of underwater hydraulic actuator, including cylinder cover, diaphragm, piston, shell and spring;Wherein shell overall is cup-shaped, and the opening portion of shell is fixedly connected with cylinder cover;Diaphragm is embedded in the inside of shell, and diaphragm uses flexible sealing material;The opening of diaphragm is fixed in the opening portion of shell;Piston is arranged between diaphragm and the bottom of shell, and spring in compression state is also arranged between piston and the bottom of shell;The bottom of shell is also provided with the balance hole for balancing internal and external pressure;Cylinder cover is also connected with the hydraulic actuator of outside, and cylinder cover is provided with oil supply hole, which communicates the internal space of hydraulic actuator and the internal space of diaphragm;So that the oil pressure in the inside of diaphragm always forms pressure difference with the ambient water pressure of outside, avoids the water of outside to pour into the inside of hydraulic system.

Description

Technical Field

[0001] This utility model relates to the field of actuator technology, and in particular to a compensation device for an underwater hydraulic actuator. Background Technology

[0002] An electro-hydraulic actuator (EHA), also known as an electro-hydraulic actuator, is a high-performance, integrated power actuator. It drives a hydraulic cylinder to move based on received electrical signals using direct-drive volumetric control technology, thereby achieving precise control of position, speed, direction, and force. A direct-drive EHA mainly consists of core components such as a motor, hydraulic pump, safety valve, actuator cylinder, and oil tank. In the motor controller, reference signals and various feedback signals are amplified by a power driver, driving the system motor to drive the hydraulic pump to output hydraulic fluid. This creates a pressure difference within the hydraulic cylinder, driving the actuator cylinder to work, ultimately converting electrical energy into hydraulic energy and then into mechanical energy. When the actuator operates underwater, the external water pressure can affect the normal operation of the hydraulic components. Therefore, underwater EHA actuators require a pressure compensator, as shown in patent application publication number CN120212100A. However, existing compensators for underwater EHAs only consider the balance with ambient water pressure, neglecting the fact that their sealing performance deteriorates when the internal oil pressure and external water pressure are balanced, especially in pressure-sealed areas, potentially leading to seawater backflow into the hydraulic system. Therefore, a compensation device for underwater hydraulic actuators capable of creating a pressure differential with the external water pressure is proposed. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies and provide a compensation device for underwater hydraulic actuators.

[0004] To solve the above problems, the present invention adopts the following solution: A compensation device for an underwater hydraulic actuator includes a cylinder head, a diaphragm, a piston, a housing, and a spring. The housing is cup-shaped and fixedly connected to the cylinder head at its opening. The diaphragm, also cup-shaped, is embedded inside the housing and is made of a flexible sealing material. The opening of the diaphragm faces the same direction as the opening of the housing and is fixed to the opening of the housing. The piston is positioned between the bottom of the diaphragm and the housing, and a compressed spring is also positioned between the piston and the bottom of the housing. The bottom of the housing also has a balancing hole for balancing internal and external pressures. The cylinder head is connected to an external hydraulic actuator and has an oil supply hole that connects the internal space of the hydraulic actuator to the internal space of the diaphragm.

[0005] Furthermore, the diaphragm has an outwardly extending sealing edge at its opening edge; the sealing edge is sandwiched between the opening of the cylinder head and the outer shell to achieve fixation.

[0006] Furthermore, the sealing edge facing the cylinder head is set as a plane, which fits with the plane on the cylinder head; the sealing edge facing the outer shell is provided with an annular convex edge, and a groove corresponding to the convex edge is provided at the opening end of the outer shell, and the convex edge is embedded in the groove for locking and fixing.

[0007] Furthermore, the outer casing is provided with an indicator window, and the piston is provided with an indicator corresponding to the indicator window. The position of the indicator inside the outer casing can be seen through the indicator window from the outside of the outer casing.

[0008] Furthermore, the indicator window is a long, narrow, hollowed-out groove that extends from the bottom of the outer casing to the opening end of the outer casing; the indicator is a slider with a protrusion, which is fixed to the piston, and the protrusion on the slider is embedded in the hollowed-out groove.

[0009] Furthermore, a retainer that cooperates with the spring is fixedly provided at the bottom of the housing; the edge of the retainer is annular, and the spring is embedded inside or outside the retainer.

[0010] Furthermore, the edge of the piston fits against the inner wall of the outer casing, and a through pressure relief hole is provided in the middle part of the piston.

[0011] Furthermore, the cylinder head is provided with outwardly protruding cylindrical sections for embedding external hydraulic actuators.

[0012] The beneficial effects of this utility model are as follows: By installing a spring inside the housing to push the piston toward the diaphragm, a pressure difference is created between the oil pressure inside the diaphragm and the ambient water pressure outside, preventing external water from flowing back into the hydraulic system and ensuring that the underwater actuator can operate stably. By setting a convex edge on the edge of the diaphragm to match the groove on the outer shell, the edge of the diaphragm is stably clamped between the cylinder head and the outer shell, and a tight connection is maintained. By setting an indicator window on the outer casing, in conjunction with an indicator on the piston, the operator can easily know the remaining amount of compensating hydraulic oil stored in the diaphragm; By setting a pressure relief hole on the piston, seawater can directly contact the outside of the diaphragm for hydraulic compensation, thus avoiding the formation of a sealed space between the piston and the diaphragm. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is an exploded view of the overall structure of Example 1; Figure 3 This is a schematic diagram of the fit between the cylinder head, diaphragm, and outer shell in Example 1; Figure 4 This is a schematic diagram of the cylinder head, diaphragm, and outer shell from another angle in Example 1; Figure 5 This is a schematic diagram showing the connection between the compensation device and the hydraulic actuator in Example 1.

[0014] Explanation of the symbols in the attached diagram: Cylinder head 1, Diaphragm 2, Piston 3, Outer shell 4, Spring 5, Balance hole 6, Oil supply hole 7, Sealing edge 8, Raised edge 9, Groove 10, Indicator window 11, Indicator 12, Cage 13, Pressure relief hole 14. Detailed Implementation

[0015] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0016] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the figures only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0017] Example 1: like Figures 1-5As shown, a compensation device for an underwater hydraulic actuator includes a cylinder head 1, a diaphragm 2, a piston 3, a housing 4, and a spring 5. The housing 4 is cup-shaped and fixedly connected to the cylinder head 1 at its opening. The diaphragm 2, also cup-shaped, is embedded inside the housing 4. The diaphragm 2 is made of a flexible sealing material, serving both deformation and hydraulic oil storage functions. The opening of the diaphragm 2 faces the same direction as the opening of the housing 4, and the opening of the diaphragm 2 is fixed to the opening of the housing. The piston 3 is positioned between the bottom of the diaphragm 2 and the housing 4, enabling it to move. A compressed spring 5 is also positioned between the piston 3 and the bottom of the housing 4, constantly applying a thrust towards the diaphragm 2 to the piston 3. A balance hole 6 is also provided at the bottom of the housing 4 to balance internal and external pressures, achieving... The water pressure inside and outside the outer casing 4 is balanced, thereby compressing the diaphragm 2 to compensate for the pressure inside the actuator. The cylinder head 1 is also connected to the external hydraulic actuator. The cylinder head 1 is provided with an oil supply hole 7 that connects the internal space of the hydraulic actuator and the internal space of the diaphragm 2. Through the oil supply hole 7, the hydraulic oil stored in the flexible diaphragm 2 can be filled into the hydraulic actuator connected to it. It should be noted that in this example, the cylinder head 1 and the end cover of the hydraulic actuator are the same component, that is, the compensation device is directly connected to the end of the hydraulic actuator. In addition, due to the action of the spring 5, the hydraulic pressure inside the diaphragm 2 and the hydraulic actuator is always higher than the external ambient water pressure, forming a pressure difference, ensuring the sealing effect of the sealing parts, and effectively preventing the backflow of external ambient water into the hydraulic system.

[0018] The diaphragm 2 has an outwardly extending sealing edge 8 at its opening edge. The sealing edge 8 is sandwiched between the opening of the cylinder head 1 and the outer shell 4 to achieve fixation and prevent the hydraulic oil stored in the diaphragm 2 from leaking into the external environment. In this example, the side of the sealing edge 8 facing the cylinder head 1 is set as a plane, which fits with the plane on the cylinder head 1 to ensure sealing performance. The edge of the sealing edge 8 facing the outer shell 4 has an annular protruding edge 9. A groove 10 corresponding to the protruding edge 9 is provided at the opening end of the outer shell 4. The protruding edge 9 is embedded in the groove 10 and fixed to achieve a stable connection effect, preventing the diaphragm 2 from coming off the connection between the cylinder head 1 and the outer shell 4 when it moves.

[0019] The outer casing 4 is provided with an indicator window 11, and the piston 3 is provided with an indicator 12 corresponding to the indicator window 11. The position of the indicator 12 inside the outer casing 4 can be seen through the indicator window 11 from the outside of the outer casing 4. In this example, the indicator window 11 is a long, narrow, hollowed-out groove that extends from the bottom of the outer casing 4 to the opening end of the outer casing 4. The indicator 12 is a slider with a protrusion, which is fixed to the piston 3, and the protrusion on the slider is embedded in the hollowed-out groove. Through the mechanical linkage between the slider and the internal piston 3, the position of the slider in the indicator window 11 of the outer casing 4 can be changed as the piston 3 moves up and down, thereby providing the operator with a real-time, visual indication of the remaining oil level in the compensator.

[0020] The edge of the piston 3 fits against the inner wall of the outer casing 4, and a through pressure relief hole 14 is provided in the middle of the piston 3. Through the pressure relief hole 14, the flexible diaphragm 2 inside the outer casing 4 can directly contact the diaphragm 2, compressing it from multiple directions and balancing the pressure of the hydraulic oil inside, thus achieving a pressure compensation effect. This prevents the formation of a sealed space between the piston 3 and the diaphragm 2, which would cause the diaphragm 2 to be deformed and damaged due to excessive pressure. In this example, because the piston 3 is provided with a pressure relief hole 14, the seawater pressure on its exterior is balanced, and it is only driven by the elastic force of the spring 5 to compress the diaphragm 2.

[0021] The bottom of the outer casing 4 is also fixedly provided with a retainer 13 that cooperates with the spring 5; the edge of the retainer 13 is annular, and the spring 5 is embedded inside or outside the retainer 13 to maintain the stability of the spring 5 connection and prevent the spring 5 from shifting.

[0022] The cylinder head 1 is provided with an outwardly protruding column for embedding an external hydraulic actuator, which facilitates docking with the hydraulic actuator and ensures a stable connection.

[0023] The above description is merely a specific example of this utility model and does not constitute any limitation on this utility model. Obviously, those skilled in the art, after understanding the content and principle of this utility model, may make various modifications and changes in form and details without departing from the principle and structure of this utility model. However, these modifications and changes based on the concept of this utility model are still within the protection scope of the claims of this utility model.

Claims

1. A compensation device for an underwater hydraulic actuator, characterized in that, It includes a cylinder head (1), a diaphragm (2), a piston (3), a housing (4), and a spring (5); the housing (4) is cup-shaped and is fixedly connected to the cylinder head (1) at the opening of the housing (4); the diaphragm (2) is also cup-shaped and is embedded inside the housing (4), and the diaphragm (2) is made of flexible sealing material; the opening of the diaphragm (2) is aligned with the opening of the housing (4), and the opening of the diaphragm (2) is fixed at the opening of the housing; The piston (3) is located between the bottom of the diaphragm (2) and the shell (4). A compressed spring (5) is also located between the bottom of the piston (3) and the shell (4). A balance hole (6) for balancing internal and external pressure is also located at the bottom of the shell (4). The cylinder head (1) is also connected to an external hydraulic actuator. An oil supply hole (7) is provided on the cylinder head (1) to connect the internal space of the hydraulic actuator with the internal space of the diaphragm (2).

2. The compensation device for an underwater hydraulic actuator according to claim 1, characterized in that, The diaphragm (2) has an outwardly extending sealing edge (8) at its opening edge; the sealing edge (8) is sandwiched between the opening of the cylinder head (1) and the outer shell (4) to achieve fixation.

3. The compensation device for an underwater hydraulic actuator according to claim 2, characterized in that, The sealing edge (8) is set as a plane on the side facing the cylinder head (1), and the plane fits the plane on the cylinder head (1); the sealing edge (8) facing the outer shell (4) is provided with an annular convex edge (9), and a groove (10) corresponding to the convex edge (9) is provided at the opening end of the outer shell (4), and the convex edge (9) is embedded in the groove (10) and fixed.

4. The compensation device for an underwater hydraulic actuator according to claim 1, characterized in that, An indicator window (11) is provided on the outer casing (4), and an indicator (12) corresponding to the indicator window (11) is provided on the piston (3). The position of the indicator (12) inside the outer casing (4) can be seen through the indicator window (11) from the outside of the outer casing (4).

5. The compensation device for an underwater hydraulic actuator according to claim 4, characterized in that, The indicator window (11) is a long, narrow, hollowed-out groove that extends from the bottom of the outer shell (4) to the opening end of the outer shell (4); the indicator (12) is a slider with protrusions, which is fixed on the piston (3), and the protrusions on the slider are embedded in the hollowed-out groove.

6. The compensation device for an underwater hydraulic actuator according to claim 1, characterized in that, The bottom of the outer casing (4) is also fixedly provided with a retainer (13) that cooperates with the spring (5); the edge of the retainer (13) is annular, and the spring (5) is embedded inside or outside the retainer (13).

7. The compensation device for an underwater hydraulic actuator according to claim 1, characterized in that, The edge of the piston (3) is attached to the inner wall of the outer shell (4), and a through pressure relief hole (14) is provided in the middle part of the piston (3).

8. A compensation device for an underwater hydraulic actuator according to claim 1, characterized in that, The cylinder head (1) is provided with an outwardly protruding column for embedding an external hydraulic actuator.

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