An embedded actuating cylinder suitable for narrow space

Abstract

The application discloses an embedded actuating cylinder suitable for narrow space and belongs to the technical field of hydraulic elements, which comprises an actuating cylinder, a micro gear pump and an oil tank, the actuating cylinder and the oil tank are arranged along the axial direction, the actuating cylinder and the oil tank are of an elongated structure, the oil tank comprises a mounting cavity and an oil cavity, the micro gear pump is embeddedly mounted in the mounting cavity, the mounting cavity is communicated with the oil cavity, one end of the mounting cavity of the oil tank is connected with the actuating cylinder, and the mounting cavity is communicated with the actuating cylinder. The actuating cylinder and the oil tank are of an elongated structure and are arranged along the axial direction, thus the additional space occupation is reduced, the actuating cylinder is conveniently arranged in a narrow and compact space, meanwhile, the structure is simple, the maintenance and replacement are facilitated, the single-stage cylinder or the multi-stage cylinder can be adjusted according to the requirement, meanwhile, the shell of the actuating cylinder and the oil tank can resist high temperature and corrosion, and can adapt to the harsh environment such as downhole operation.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic component technology, and in particular relates to an embedded actuating cylinder suitable for confined spaces. Background Technology

[0002] A hydraulic cylinder is an actuator in a hydraulic transmission system. It converts hydraulic energy into mechanical energy to achieve linear reciprocating motion.

[0003] Traditional hydraulic cylinders are mostly equipped with oil inlet and outlet ports. The hydraulic cylinder plus the oil supply system takes up a lot of space, making it difficult to adapt to use in small and compact spaces. At the same time, the complex structure makes it inconvenient to maintain and replace. Summary of the Invention

[0004] The purpose of this invention is to provide an embedded actuated cylinder suitable for confined spaces, so as to solve the problems existing in the prior art.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] An embedded actuating cylinder suitable for confined spaces includes an actuating cylinder, a micro gear pump, and an oil tank. The actuating cylinder and the oil tank are arranged axially and have slender structures. The oil tank includes a mounting cavity and an oil cavity. The micro gear pump is embedded in the mounting cavity, and the mounting cavity communicates with the oil cavity. One end of the mounting cavity of the oil tank is connected to the actuating cylinder, and the mounting cavity communicates with the actuating cylinder.

[0007] Furthermore, the actuating cylinder is a single-stage cylinder, the actuating cylinder includes an outer cylinder and a piston rod, the piston rod includes a rod body and a piston head, and a spring is sleeved on the rod body, the spring being located inside the outer cylinder and between the piston head.

[0008] Furthermore, the actuating cylinder is a multi-stage cylinder, comprising a sleeve, a primary piston cylinder assembly, and a secondary piston cylinder assembly, which are nested sequentially from the outside to the inside, and one end of the bottom of the sleeve is connected to the mounting cavity.

[0009] Furthermore, the micro gear pump is a bidirectional gear pump, the micro gear pump extends into the oil tank, and the motor of the micro gear pump is located outside the oil tank.

[0010] Furthermore, the oil tank has a cylindrical or cuboid structure, and the width of the oil tank matches the diameter of the outer cylinder.

[0011] Furthermore, the actuating cylinder is provided with a cylinder block at one end near the gear pump, the cylinder block being connected to the outer cylinder and the micro gear pump respectively, and the oil tank is provided with an oil tank block at the end.

[0012] The beneficial effects of this invention are:

[0013] 1) Both the single-stage cylinder and the oil tank are slender structures and arranged along the axial direction, reducing the additional space occupied and making it easy to install in a small and compact space.

[0014] 2) The oil tank is fixed by embedding a micro gear pump. The oil tank and the front-end actuating cylinder can be disassembled and replaced, which facilitates subsequent inspection and maintenance. At the same time, single-stage cylinders or multi-stage cylinders can be replaced according to different usage requirements.

[0015] 3) The housings of the actuator cylinder and oil tank are resistant to high temperatures and corrosion, and can adapt to harsh environments such as downhole operations. Attached Figure Description

[0016] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0017] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic diagram of the piston rod in Example 1;

[0019] Figure 4 This is a perspective view of Embodiment 2 of the present invention;

[0020] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention;

[0021] Figure 6 This is a schematic diagram of the fuel tank in this invention;

[0022] In the diagram, 1-actuator, 11-rod, 12-piston head, 13-spring, 14-outer cylinder, 15-cylinder plug, 16-sleeve, 17-first-stage piston cylinder assembly, 18-second-stage piston cylinder assembly, 2-oil tank, 21-oil tank plug, 22-mounting cavity, 23-oil chamber, 3-micro gear pump, 31-motor. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1:

[0025] like Figures 1-3 , Figure 6As shown, it includes an actuating cylinder 1, a micro gear pump 3, and an oil tank 2. The actuating cylinder 1 and the oil tank 2 are arranged along the axial direction. The actuating cylinder 1 and the oil tank 2 are slender structures. At the same time, since the micro gear pump 3 is embedded in the oil tank 2, the entire structure is long and narrow, which makes it convenient to install in a small and compact space.

[0026] like Figure 6 As shown, the oil tank 2 includes a mounting cavity 22 and an oil chamber 23. A micro gear pump 3 is embedded in the mounting cavity 22, which is connected to the oil chamber 23. One end of the mounting cavity 22 is connected to the actuating cylinder 1. The micro gear pump 3 in the mounting cavity 22 is used to pump oil from the oil chamber 23 into the actuating cylinder 1.

[0027] The pump gear is located inside the oil tank 2, and the motor 31 is located outside the oil tank 2. The embedded installation structure makes it easy to install or remove the micro gear pump 3 from the oil tank 2, which facilitates subsequent maintenance and repair, while also reducing space occupation and making the structure more compact.

[0028] The casings of the actuator cylinder 1 and the oil tank 2 are made of high-temperature and corrosion-resistant materials, which can adapt to harsh environments such as downhole operations.

[0029] In this embodiment, the actuating cylinder 1 is a single-stage cylinder. The single-stage cylinder includes an outer cylinder 14 and a piston rod. The piston rod includes a rod body 11 and a piston head 12. A spring 13 is sleeved on the rod body 11. The spring 13 is located inside the outer cylinder 14 and between the piston head 12.

[0030] With the above technical solution, during operation, the micro gear pump 3 pumps oil from the oil tank 2 into the outer cylinder 14 to push one end of the piston head 12. At this time, the spring 13 at the other end of the piston head 12 is compressed by the hydraulic oil pump, and the piston rod extends. When the micro gear pump 3 reverses, the hydraulic oil in the outer cylinder 14 is sucked back into the oil tank 2, and at the same time, the piston rod is reset under the action of the spring 13, and the piston rod is in a contracted state. The reciprocating action of the above actions can realize the extension and retraction action of a single-stage cylinder.

[0031] Furthermore, in this embodiment, the micro gear pump 3 is a bidirectional gear pump, capable of both oil suction and discharge. The oil tank 2 is a vacuum environment to ensure sealing and facilitate the operation of the micro gear pump 3.

[0032] It is known that the gear pump can also use a common one-way rotating gear pump structure. In this case, a return oil line and a one-way valve need to be added to the single-stage cylinder. The other end of the return oil line is connected to the oil tank 2, so that when the piston rod needs to retract, the cylinder returns oil and the piston rod retracts under the action of the spring 13.

[0033] Furthermore, the oil tank 2 is a cylindrical or cuboid structure, which makes the overall structure match the single-stage cylinder and adapt to narrow spaces. Preferably, the width of the oil tank 2 matches the diameter of the outer cylinder 14, keeping the outer diameter of the overall structure the same.

[0034] Furthermore, the actuating cylinder 1 is provided with a cylinder plug 15 at one end near the gear pump. The cylinder plug 15 is connected to the outer cylinder 14 and the gear pump respectively. The single-stage cylinder and the oil tank 2 are detachably connected for easy subsequent maintenance and replacement. The oil tank plug 21 of the oil tank 2 can be used for oil filling and draining.

[0035] In this embodiment, the oil tank 2 has a simple and compact structure, while the micro gear pump 3 can be embedded in the oil tank 2, reducing unnecessary space occupation. At the same time, the micro gear pump 3 and the oil tank 2 can be connected as one unit, and the oil tank 2 and the front actuating cylinder 1 can be disassembled for convenient subsequent inspection and maintenance.

[0036] Example 2:

[0037] like Figure 4-6 As shown, the actuating cylinder 1 in this embodiment is a multi-stage cylinder, which includes a sleeve 16, a first-stage piston cylinder assembly 17 and a second-stage piston cylinder assembly 18. The sleeve 16, the first-stage piston cylinder assembly 17 and the second-stage piston cylinder assembly 18 are nested from the outside to the inside. One end of the bottom of the sleeve 16 is connected to the mounting cavity 22.

[0038] Oil enters through the oil port on the rodless chamber side. The pressurized oil first pushes the first-stage piston cylinder assembly 17, which has a larger effective working area, to move. After the first-stage piston cylinder assembly 17 has fully extended to its end point, the pressurized oil continues to push the second-stage piston cylinder assembly 18 to extend outward, completing the full stroke extension.

[0039] Oil enters through the oil port on the rod chamber side. The pressurized oil first pushes the secondary piston cylinder assembly 18 inward to retract. After the secondary piston cylinder assembly 18 is fully retracted to its end position, the pressurized oil continues to push the primary piston cylinder assembly 17 inward to retract, completing the full stroke retraction. The oil inlet and return lines are not specifically marked in the diagram. It can be understood that the hydraulic oil pump in the oil chamber 23 is supplied to the multi-stage cylinder via the micro gear pump 3, and the oil return line is connected to the oil tank 2 for oil return. The oil inlet and return lines of the multi-stage cylinder are conventional technologies and will not be elaborated further.

[0040] Based on Example 2, in another embodiment, no additional oil return port or oil return pipeline is provided. The micro gear pump 3 is a bidirectional gear pump, capable of both oil suction and discharge. The oil tank 2 is a vacuum environment to ensure sealing and facilitate the operation of the micro gear pump 3. The micro gear pump 3 supplies oil to the multi-stage cylinders from the oil tank 2, enabling the multi-stage cylinders to extend; it also draws oil back into the oil tank 2 through reverse rotation, retracting the multi-stage cylinders through pressure difference.

[0041] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An embedded actuated cylinder suitable for confined spaces, characterized in that: The device includes an actuating cylinder (1), a micro gear pump (3), and an oil tank (2). The actuating cylinder (1) and the oil tank (2) are arranged axially. The actuating cylinder (1) and the oil tank (2) are slender structures. The oil tank (2) includes an installation cavity (22) and an oil chamber (23). The micro gear pump (3) is embedded in the installation cavity (22). The installation cavity (22) is connected to the oil chamber (23). One end of the installation cavity (22) of the oil tank (2) is connected to the actuating cylinder (1). The installation cavity (22) is connected to the actuating cylinder (1).

2. The embedded actuated cylinder suitable for confined spaces according to claim 2, characterized in that: The actuating cylinder (1) is a single-stage cylinder. The actuating cylinder (1) includes an outer cylinder (14) and a piston rod. The piston rod includes a rod body (11) and a piston head (12). A spring (13) is sleeved on the rod body (11). The spring (13) is located inside the outer cylinder (14) and between the piston head (12).

3. The embedded actuated cylinder suitable for confined spaces according to claim 1, characterized in that: The actuating cylinder (1) is a multi-stage cylinder. The actuating cylinder (1) includes a sleeve (16), a first-stage piston cylinder assembly (17), and a second-stage piston cylinder assembly (18). The sleeve (16), the first-stage piston cylinder assembly (17), and the second-stage piston cylinder assembly (18) are nested from the outside to the inside. One end of the bottom of the sleeve (16) is connected to the mounting cavity (22).

4. The embedded actuated cylinder suitable for confined spaces according to claim 1, characterized in that: The micro gear pump (3) is a bidirectional gear pump. The micro gear pump (3) extends into the oil tank (2), and the motor (31) of the micro gear pump (3) is located outside the oil tank (2).

5. The embedded actuated cylinder suitable for confined spaces according to claim 1, characterized in that: The oil tank (2) is a cylindrical or cuboid structure, and the width of the oil tank (2) matches the diameter of the outer cylinder (14).

6. The embedded actuated cylinder suitable for confined spaces according to claim 1, characterized in that: The actuating cylinder (1) is provided with a cylinder plug (15) at one end near the gear pump. The cylinder plug (15) is connected to the outer cylinder (14) and the micro gear pump (3) respectively. The oil tank (2) is provided with an oil tank plug (21) at the end.

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