An electric drive oil leakage prevention structure applied to an electric pumping unit

Abstract

The utility model discloses an electric drive oil leakage prevention structure applied to electric pumping unit, is equipped with electric cylinder drive system on electric pumping unit, and this electric cylinder drive system includes servo motor, ball screw, electric cylinder outer tube, electric cylinder inner tube and oil leakage prevention structure, the electric cylinder inner tube sets up electric cylinder outer tube inside, the electric cylinder inner tube moves up and down in electric cylinder outer tube, sets up the oil leakage prevention module between the outer wall of electric cylinder inner tube and the inner wall of electric cylinder outer tube, the oil leakage prevention module includes flange and framework oil seal, the flange sets up electric cylinder outer tube inner wall top, the electric cylinder inner tube is connected with the middle part of flange, sets up the framework oil seal between the flange and electric cylinder inner tube, the framework oil seal opening is downward, and the framework oil seal is closely connected with electric cylinder inner tube. The utility model sets up the framework oil seal between electric cylinder inner tube and electric cylinder outer tube, avoided the electric cylinder inner tube when running to take out lubricating oil, realized the electric cylinder inner tube operation oil leakage prevention function.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction equipment technology, and in particular relates to an electric-driven oil leakage prevention structure applied to electric pumping units. Background Technology

[0002] Electric cylinder pumping units are a widely promoted energy-saving, environmentally friendly, and efficient oil extraction method. They utilize a servo motor as the output power, which, through the application of a ball screw, directly forms the electric cylinder drive system to move the walking beam up and down. An adjustable counterweight assists in this process, and the up-and-down swing of the walking beam drives the pumping head to move up and down, thus achieving stable and effective oil extraction. The electric cylinder drive system provides power to the entire system, enabling the movement of the inner tube within the outer tube of the electric cylinder.

[0003] In the oilfield development field, the power system of beam pumping units (commonly known as "nodding donkeys") often uses electric cylinders as the core drive component, transmitting power through the relative reciprocating motion of the inner and outer pipes. Because the electric cylinders operate under high load and high frequency reciprocating motion conditions for a long time, and are exposed to harsh outdoor environments (such as sandstorms, temperature differences, corrosive media, etc.), the sealing reliability of the joint between the inner and outer pipes directly determines the equipment lifespan and maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide an electric drive oil leakage prevention structure for use in electric pumping units. This utility model prevents lubricating oil from being carried out by the inner tube of the electric cylinder during operation by setting a skeleton oil seal between the inner tube and the outer tube of the electric cylinder, thus realizing the oil leakage prevention function of the inner tube of the electric cylinder.

[0005] To achieve the aforementioned objectives of this utility model, the technical solution provided by this utility model patent is as follows:

[0006] An electrically driven oil leakage prevention structure for use in an electric oil pump includes an electric cylinder drive system with a servo motor and a ball screw. The bottom of the ball screw is connected to the servo motor for power, and the ball screw nut is connected to the inner tube of the electric cylinder. An outer tube of the electric cylinder is located outside the inner tube, and the oil leakage prevention structure is positioned between the outer tube and the inner tube. The oil leakage prevention structure comprises an outer tube, an inner tube, and an oil leakage prevention module. The inner tube is located inside the outer tube and moves vertically within it. An oil leakage prevention module is positioned between the outer wall of the inner tube and the inner wall of the outer tube. The oil leakage prevention module includes a flange and a skeleton oil seal. The flange is located at the top of the inner wall of the outer tube, and the inner tube is connected to the middle of the flange. A skeleton oil seal is positioned between the flange and the inner tube, with the opening facing downwards and tightly connected to the inner tube.

[0007] Furthermore, the aforementioned skeleton oil seal has a ring structure with an inverted L-shaped cross-section.

[0008] Furthermore, the skeleton oil seal is provided with a hard sealing part and a flexible moving part inside. The hard sealing part is located at the upper part, surrounding the outer wall of the inner tube of the electric cylinder and leaving a gap. The middle part of the flexible moving part protrudes inward away from the inner tube of the electric cylinder, and the end of the flexible moving part bends outward to adhere to the outer wall of the inner tube of the electric cylinder.

[0009] Furthermore, a felt is provided at the bottom of the skeleton oil seal. The felt is ring-shaped and stores lubricating oil inside when the electric cylinder outer tube is started and running.

[0010] Furthermore, the inner wall of the flange is provided with a groove, and a straightening guide strip is provided in the groove.

[0011] Furthermore, the straightening guide bar is slidably connected to the outer wall of the inner tube of the electric cylinder.

[0012] Furthermore, the straightening guide bar adopts a multi-ribbed design, which straightens the inner tube of the electric cylinder within the outer tube of the electric cylinder, allowing the inner tube of the electric cylinder to move up and down within the outer tube of the electric cylinder.

[0013] Based on the above solution, the electric-driven oil leakage prevention structure applied to an electric oil pumping unit has achieved positive and beneficial results in practice:

[0014] 1. The present invention relates to an electric drive oil leakage prevention structure applied to an electric pumping unit. By setting a skeleton oil seal between the inner tube and the outer tube of the electric cylinder, the lubricating oil is prevented from being carried out by the inner tube of the electric cylinder during operation, thus realizing the oil leakage prevention function of the inner tube of the electric cylinder.

[0015] 2. The electric drive oil leakage prevention structure of this utility model adopts an L-shaped skeleton oil seal with an inverted cross-section. The inverted skeleton oil seal prevents lubricating oil from leaking out from the top. When the inner tube of the electric cylinder rises, carrying lubricating oil, the inverted skeleton oil seal scrapes the lubricating oil down and flows back into the lubricating oil pool. The skeleton oil seal is designed with a hard sealing part and a flexible moving part. The hard sealing part can be fitted onto the inner tube of the electric cylinder without affecting the up and down movement. Part of the flexible moving part is close to the inner tube of the electric cylinder to scrape oil, and part of it is bent away from the inner tube of the electric cylinder to make the whole elastic. When the inner tube of the electric cylinder retracts, it bends to reduce friction, and when the inner tube of the electric cylinder extends, it can scrape oil again, thereby improving the oil scraping effect and extending the service life of the skeleton oil seal.

[0016] 3. The electric drive oil leakage prevention structure of this utility model also has a straightening design to ensure that the inner tube and outer tube of the electric cylinder remain coaxial, thereby reducing shaking and noise. The straightening design includes a straightening guide strip on the inner wall of the flange, which is slidably connected to the outer wall of the inner tube of the electric cylinder.

[0017] 4. The straightening guide strip of the electric drive oil leakage prevention structure of this utility model adopts a multi-ribbed design. The straightening guide strip straightens the inner tube of the electric cylinder in the outer tube of the electric cylinder, thereby ensuring smooth and efficient up and down movement of the inner tube of the electric cylinder. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an electric oil pump.

[0019] Figure 2 This is a schematic diagram of the electric drive system on an electric oil pumping unit.

[0020] Figure 3 This is a schematic diagram of the inner and outer tube alignment and oil leakage prevention structure of an electric-driven oil pumping unit according to the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific examples shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of this invention.

[0022] like Figure 1 and Figure 2 As shown, this utility model relates to an electric-driven oil leakage prevention structure applied to an electric oil pump. The oil leakage prevention structure is applied to an electric oil pump, which is equipped with an electric cylinder drive system A. The electric cylinder drive system A is equipped with a servo motor B and a ball screw C. The bottom of the ball screw C is connected to the servo motor B to provide power. The ball screw nut on the ball screw C is connected to the inner tube 5 of the electric cylinder. The outer tube 4 of the electric cylinder is located outside the inner tube 5 of the electric cylinder.

[0023] like Figure 3 As shown, the oil leakage prevention structure is set between the outer tube and the inner tube of the electric cylinder. The oil leakage prevention structure includes the outer tube 4, the inner tube 5, and the oil leakage prevention module. The inner tube 5 is set inside the outer tube 4 and moves up and down inside the outer tube 4. The oil leakage prevention module is set between the outer wall of the inner tube 5 and the inner wall of the outer tube 4.

[0024] The oil leak prevention module includes a flange and a skeleton oil seal 1. The flange is located at the top of the inner wall of the outer tube 4 of the electric cylinder. The inner tube 5 of the electric cylinder is connected to the middle of the flange. The skeleton oil seal 1 is installed between the flange and the inner tube 5 of the electric cylinder. The opening of the skeleton oil seal 1 faces downward. The skeleton oil seal 1 is tightly connected to the inner tube 5 of the electric cylinder. The purpose of the downward opening of the skeleton oil seal 1 is to prevent the lubricating oil from being carried out from the bottom to the top and leaking when the electric inner tube 5 moves upward.

[0025] The upper part of the skeleton oil seal 1 is also provided with an oil seal seat, which is connected to the flange to fix the skeleton oil seal between the inner tube 5 and the outer tube 4 of the electric cylinder, so as to prevent movement. The skeleton oil seal 1 is annularly sleeved on the outer wall of the inner tube 5 of the electric cylinder. The opening of the skeleton oil seal 1 faces downward. When the inner tube 5 of the electric cylinder moves upward, the lubricating oil enters the annular groove of the skeleton oil seal 1, so that the skeleton oil seal 1 is tightly connected to the inner tube 5 of the electric cylinder to prevent oil leakage.

[0026] The aforementioned skeleton oil seal 1 has an annular structure with an inverted L-shaped cross-section. Furthermore, the skeleton oil seal contains a rigid sealing portion and a flexible movable portion. The rigid sealing portion is located at the top, surrounding the outer wall of the inner tube of the electric cylinder and leaving a gap. The flexible movable portion protrudes inward from the middle, away from the inner tube of the electric cylinder, and its end bends outward to adhere to the outer wall of the inner tube of the electric cylinder.

[0027] By setting a skeleton oil seal 1 between the inner tube 5 and the outer tube 4 of the electric cylinder, the lubricating oil is prevented from being carried out by the inner tube 5 during operation, thus realizing the oil leakage prevention function of the inner tube 5 during operation.

[0028] The bottom of the skeleton oil seal 1 is also provided with a felt 2. The felt 2 is ring-shaped. When the electric cylinder outer tube 4 is started, the felt 2 stores lubricating oil. The felt 2 is for storing a small amount of lubricating oil to prevent the oil seal from dry friction and being damaged when starting after stopping.

[0029] The flange inner wall is provided with a groove, and a straightening guide strip 3 is provided in the groove.

[0030] The straightening guide bar 3 is slidably connected to the outer wall of the inner tube 5 of the electric cylinder.

[0031] The straightening guide bar 3 adopts a multi-ribbed design. The straightening guide bar 3 straightens the inner tube 5 of the electric cylinder in the outer tube 4 of the electric cylinder, so that the inner tube 5 of the electric cylinder moves up and down in the outer tube 4 of the electric cylinder. The straightening guide bar 3 of the inner and outer tubes usually adopts a multi-ribbed design. The purpose is to straighten the inner tube 5 of the electric cylinder in the outer tube 4 of the electric cylinder, thereby ensuring that the inner tube 5 of the electric cylinder moves up and down smoothly and efficiently.

[0032] The aforementioned straightening guide strip 3 is made of polytetrafluoroethylene, which has good stability, wear resistance, and long service life.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An electrically driven oil leakage prevention structure applied to an electric oil pumping unit, wherein the electric oil pumping unit is equipped with an electric cylinder drive system, the electric cylinder drive system comprising a servo motor, a ball screw, an outer tube of the electric cylinder, an inner tube of the electric cylinder, and an oil leakage prevention structure, the oil leakage prevention structure being disposed between the outer tube and the inner tube of the electric cylinder, characterized in that, The oil leakage prevention structure includes an outer cylinder tube, an inner cylinder tube, and an oil leakage prevention module. The inner cylinder tube is located inside the outer cylinder tube and moves up and down within it. An oil leakage prevention module is installed between the outer wall of the inner cylinder tube and the inner wall of the outer cylinder tube. The oil leakage prevention module includes a flange and a skeleton oil seal. The flange is located at the top of the inner wall of the outer cylinder tube, and the inner cylinder tube is connected to the middle of the flange. A skeleton oil seal is installed between the flange and the inner cylinder tube, with the opening facing downwards. The skeleton oil seal is tightly connected to the inner cylinder tube.

2. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 1, characterized in that, The bottom of the skeleton oil seal is also provided with a felt. The felt is ring-shaped and stores lubricating oil inside when the outer tube and inner tube of the electric cylinder are started.

3. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 1, characterized in that, The flange inner wall is provided with a groove, and a straightening guide strip is provided in the groove.

4. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 3, characterized in that, The straightening guide bar is slidably connected to the outer wall of the inner tube of the electric cylinder.

5. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 3, characterized in that, The straightening guide bar adopts a multi-ribbed design, which straightens the inner tube of the electric cylinder within the outer tube of the electric cylinder, allowing the inner tube of the electric cylinder to move up and down within the outer tube of the electric cylinder.

6. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 1, characterized in that, The aforementioned skeleton oil seal has a ring structure with an inverted L-shaped cross-section.

7. The electrically driven oil leakage prevention structure applied to an electric pumping unit according to claim 6, characterized in that, The skeleton oil seal has a hard sealing part and a flexible moving part inside. The hard sealing part is located at the top and surrounds the outer wall of the inner tube of the electric cylinder with a gap. The middle part of the flexible moving part protrudes inward away from the inner tube of the electric cylinder, and the end of the flexible moving part bends outward to adhere to the outer wall of the inner tube of the electric cylinder.

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