Hollow hydraulic lifting device

Abstract

The utility model relates to the field of auxiliary equipment related to a hydraulic pumping unit, in particular to a hollow hydraulic lifting device which comprises a hollow hydraulic cylinder, a connecting rod, a connecting rod fixing device and a piston rod end cover, and the hollow hydraulic cylinder is sequentially provided with a hollow core barrel, a hollow piston rod, a hollow piston and a cylinder barrel from inside to outside. The connecting rod penetrates into the hollow core barrel, the piston rod end cover is arranged at the end of the hollow piston rod and provided with an axis hole, a fixator is arranged on the portion, penetrating through the axis hole, of the connecting rod, and the hollow hydraulic cylinder is further provided with a rodless cavity oil port and a rod cavity oil port. The utility model provides a hollow hydraulic lifting device which is installed on the ground and coaxially installed, is provided with an upward piston rod, and balances the area of a piston, the weight of the whole machine, the stroke frequency speed and the stroke length.

Description

Technical Field

[0001] The utility model relates to the field of auxiliary equipment related to hydraulic oil pumping units, in particular to a hollow hydraulic lifting device. Background Art

[0002] Over the past few decades, a major advancement in long-stroke oil production systems has been the introduction of hydraulically powered pumping units. These units not only improve efficiency and reduce energy consumption, but also make installation more convenient and save time. Conventional hydraulic pumping units typically have two types of hydraulic lifts, either above-ground or below-ground, depending on their installation location. These two types present several challenges during installation and use:

[0003] 1. Installation on the ground

[0004] 1.1 The hydraulic lifting mechanism with the piston rod upward is usually installed near the wellhead. It may not be coaxial with the wellhead polished rod. Long-term use may cause uneven wear due to uneven force.

[0005] 1.2 Installing hydraulic lifting mechanisms on both sides can solve the above problems, but the cost will also increase accordingly

[0006] 1.3 A small piston area can increase the stroke rate and cylinder speed, and lighten the overall weight of the mechanism, but it will affect the stroke length and installation stability; conversely, a large piston area can increase the stroke length and installation stability, and the overall weight of the mechanism will be medium, but it will affect the stroke rate and cylinder speed.

[0007] 2. Underground installation

[0008] 2.1 The piston rod is usually installed in the wellhead with the piston rod facing downward. During the extension and retraction process of the piston rod, the oil on the piston rod will affect the service life of the dust ring and lip seal in the piston rod sealing system.

[0009] 2.2 In order to improve mining efficiency at low temperatures, various methods are often used to increase the temperature at the wellhead. This will increase the temperature of the hydraulic oil in the cylinder, affecting the performance of the hydraulic oil and also placing higher requirements on the heat dissipation of the hydraulic system.

[0010] 2.3 When the oil cylinder is working in the wellhead, once the piston rod seal fails, the crude oil and other liquids in the wellhead will enter the rod cavity of the oil cylinder and enter the hydraulic system with the hydraulic circulation, which will have an adverse effect on the hydraulic system. Utility Model Content

[0011] In view of the above problems, the present invention provides a hollow hydraulic lifting device, which solves the problems in the above background technology.

[0012] The technical solution adopted by the utility model to solve its technical problems is: a hollow hydraulic lifting device, including a hollow hydraulic cylinder, a connecting rod, a connecting rod fixer and a piston rod end cover, the hollow hydraulic cylinder is provided with a hollow core barrel, a hollow piston rod, a hollow piston and a cylinder barrel from the inside to the outside, the connecting rod passes through the hollow core barrel, the piston rod end cover is arranged at the end of the hollow piston rod and is provided with an axial hole, the part of the connecting rod passing through the axial hole is provided with a fixer, and the hollow hydraulic cylinder is also provided with a rodless chamber oil port and a rod chamber oil port.

[0013] As an optimization, a hollow piston-cylinder sealing assembly is provided at one end of the cylinder and the hollow piston near the rodless chamber oil port, and a hollow piston-hollow core barrel sealing assembly is provided at one end of the hollow piston and the hollow core barrel near the rodless chamber oil port.

[0014] As an optimization, a hollow piston rod and cylinder sealing assembly is provided at one end of the hollow piston rod and cylinder near the rod chamber oil port, and a hollow piston rod and hollow core barrel sealing assembly is provided at one end of the hollow piston rod and hollow core barrel near the rod chamber oil port.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a hollow hydraulic lifting device, which solves the shortcomings of hydraulic lifting that the coaxial installation on the ground affects the life of the cylinder; the shortcomings of the hydraulic lifting that the cylinder is installed on the ground cannot achieve both stroke rate and speed and stroke; the shortcomings of the hydraulic lifting system being installed under the ground that the sealing system has a short life; the shortcomings of the hydraulic lifting that is installed under the ground affects the heat dissipation of the hydraulic system; the shortcomings of the hydraulic lifting that the seal failure when installed under the ground has a great impact on the hydraulic system, and provides a hollow hydraulic lifting device that is installed on the ground, coaxially, with the piston rod upward, and balances the piston area, the weight of the whole machine, the stroke speed, and the stroke length. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attachment Figure 1 It is a structural diagram of the utility model;

[0017] Attachment Figure 2 for Figure 1 Schematic diagram of the structure of part B;

[0018] Attachment Figure 3 for Figure 1 Schematic diagram of the structure of part C.

[0019] In the figure: 1 rodless chamber oil port, 2 hollow piston, 3 hollow piston rod, 4 cylinder barrel, 5 hollow core barrel, 6 rod chamber oil port, 7 piston rod end cover, 8 hollow piston cylinder barrel seal assembly, 9 hollow piston hollow core barrel seal assembly, 10 hollow piston rod cylinder barrel seal assembly, 11 hollow piston rod hollow core barrel seal assembly, 12 retainer, 13 connecting rod. DETAILED DESCRIPTION

[0020] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] For the convenience of description, if the words "up", "down", "left" and "right" appear in this utility model, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present utility model.

[0023] like Figure 1-3 As shown, a hollow hydraulic lifting device includes a hollow hydraulic cylinder, a connecting rod 13, a connecting rod 13 fixer 12 and a piston rod end cover 7. The hollow hydraulic cylinder is provided with a hollow core barrel 5, a hollow piston rod 3, a hollow piston 2 and a cylinder barrel 4 from the inside to the outside. The connecting rod 13 passes through the hollow core barrel 5. The piston rod end cover 7 is arranged at the end of the hollow piston rod 3 and is provided with an axial hole. The part of the connecting rod 13 passing through the axial hole is provided with a fixer 12. The hollow hydraulic cylinder is also provided with a rodless chamber oil port 1 and a rod chamber oil port 6.

[0024] like Figure 2-3 As shown, the cylinder 4 and the hollow piston 2 are provided with a hollow piston-cylinder sealing assembly 8 at one end near the rodless chamber oil port 1, and the hollow piston 2 and the hollow core barrel 5 are provided with a hollow piston-hollow core barrel sealing assembly 9 at one end near the rodless chamber oil port 1; the hollow piston rod 3 and the cylinder 4 are provided with a hollow piston rod-cylinder sealing assembly 10 at one end near the rod chamber oil port 6, and the hollow piston rod 3 and the hollow core barrel 5 are provided with a hollow piston rod-hollow core barrel sealing assembly 11 at one end near the rod chamber oil port 6.

[0025] The upper end cover of the piston rod is installed at the top of the piston rod, the connecting rod 13 is passed through the hollow core barrel 5, the lower end is connected to the wellhead polished rod through a coupling or other means, the upper end passes through the axial hole of the piston rod end cover 7, the retainer 12 is fixed to the upper end of the connecting rod 13, and sits on the piston rod end cover 7.

[0026] The rod chamber oil port 6 and the rodless chamber oil port 1 are both connected to the hydraulic system. The hydraulic system injects hydraulic oil into the rodless chamber from the rodless chamber oil port 1. Under the action of hydraulic pressure, the piston and the piston rod are pushed outward, and the hydraulic oil in the rod chamber flows out from the rod chamber oil port 6 and returns to the hydraulic system. The hydraulic system injects hydraulic oil into the rod chamber from the rod chamber oil port 6. Under the action of hydraulic pressure, the piston and the piston rod are retracted inward, and the hydraulic oil in the rodless chamber flows out from the rodless chamber oil port 1 and returns to the hydraulic system.

[0027] When the piston rod is extended, the piston rod drives the piston end cover, the holder 12 and the connecting rod 13 to rise, and the wellhead polished rod connected to the connecting rod 13 and the sucker rod bundle connected thereto move upward. When the piston rod is retracted, the sucker rod bundle connected to the connecting rod 13 moves downward under the action of its own gravity, and drives the connecting rod 13 and the holder 12 to move downward.

[0028] The above-mentioned specific implementation methods are only specific cases of the present utility model. The scope of patent protection of the present utility model includes but is not limited to the product form and style of the above-mentioned specific implementation methods. Any appropriate changes or modifications made to them by ordinary technicians in the relevant technical field that comply with the claims of the present utility model shall fall within the scope of patent protection of the present utility model.

Claims

1. A hollow hydraulic lifting device, characterized in that: It includes a hollow hydraulic cylinder, a connecting rod, a connecting rod fixer and a piston rod end cover. The hollow hydraulic cylinder is provided with a hollow core barrel, a hollow piston rod, a hollow piston and a cylinder barrel from the inside to the outside. The connecting rod passes through the hollow core barrel. The piston rod end cover is arranged at the end of the hollow piston rod and is provided with an axial hole. The part of the connecting rod passing through the axial hole is provided with a fixer. The hollow hydraulic cylinder is also provided with a rodless chamber oil port and a rod chamber oil port.

2. The hollow hydraulic lifting device according to claim 1, characterized in that: A hollow piston-cylinder sealing assembly is provided at one end of the cylinder and the hollow piston close to the rodless chamber oil port, and a hollow piston-hollow core barrel sealing assembly is provided at one end of the hollow piston and the hollow core barrel close to the rodless chamber oil port.

3. The hollow hydraulic lifting device according to claim 1, characterized in that: The hollow piston rod and the cylinder are provided with a hollow piston rod-cylinder sealing assembly at one end close to the rod chamber oil port, and the hollow piston rod and the hollow core barrel are provided with a hollow piston rod-hollow core barrel sealing assembly at one end close to the rod chamber oil port.

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