Pumping unit reduction gearbox output shaft terminal sealing device

Abstract

The invention relates to a pumping unit reduction gearbox output shaft terminal sealing device, and belongs to the technical field of speed reduction equipment. Comprising a moving ring and a static ring which are sleeved on an output shaft of the reduction gearbox, an oil return flow channel is arranged between the moving ring and a reduction gearbox body, the moving ring and the static ring are matched in an inserting mode, a gap is arranged at the inserting position, grooves are respectively arranged on two sides of the side wall of the static ring, and an oil return hole is arranged on the groove on one side and communicated with the groove and the oil return flow channel. The mode that the terminal is sealed through centrifugal force generated by rotation of the reduction gearbox is adopted, the selected materials are all metal, and environmental influences and damage to parts caused by low temperature in winter and high temperature in summer are overcome; and the moving ring and the static ring are not contacted, so that the damage to the seal caused by friction is avoided. Under the action of centrifugal force and gravity, oil is guided back into the reduction gearbox through the oil return hole, and it is ensured that oil leakage cannot occur.

Description

Technical Field

[0001] The invention relates to a terminal sealing device for an output shaft of a reduction box of an oil pumping unit, belonging to the technical field of reduction equipment. Background Art

[0002] The beam pumping unit is an important production equipment in oilfield production. Although the types and models of beam pumping units are different, the working principles of their main structural components are basically the same. They are mainly composed of four parts: beam-connecting rod-crank mechanism, reduction box, power equipment and auxiliary devices. The three-axis two-tooth reduction mechanism of the pumping unit reduction box is the main component of the pumping equipment and is the most critical part of the pumping unit. It is subject to large torque and speed during operation. The input shaft and output shaft adopt the skeleton sealing method at the shaft head. Under the influence of long-term operation wear, fatigue, aging, manufacturing quality and on-site management, the skeleton oil seal fails, causing oil leakage at the input shaft and output shaft oil seal.

[0003] Oil leakage in the reduction gearbox is very harmful. It causes the oil level to decrease, the gear lubrication effect to be poor, and the service life of the equipment to be shortened. It pollutes the working surface, affects industrial hygiene and environmental protection requirements, and increases the difficulty of management. Oil leakage causes a substantial increase in production costs, and replenishing the oil level, maintenance and renovation, and suspension of production for rectification all have many impacts on production and operation. Oil leakage on the active shaft on the brake wheel side will also cause a decrease in brake friction and brake failure, which may cause personal injury to the operator and pose a safety hazard. It is a common problem that plagues the management of oil pumping production equipment. The traditional method of replacing the skeleton seal requires the removal of the reduction gearbox body, which has high maintenance costs and high work intensity. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention seals the terminal based on the centrifugal force generated when the output shaft of the oil tree reduction box rotates, and specifically proposes a terminal sealing device for the output shaft of the oil pump reduction box. The terminal sealing device adopts a mosaic dynamic and static ring matching, a non-contact sealing, a certain gap is left, and the installation is simple, so as to achieve the purpose of long-term sealing of the shaft head.

[0005] The technical solution adopted by the present invention is a terminal sealing device for the output shaft of an oil pump reducer, comprising a dynamic ring and a static ring sleeved on the output shaft of the reducer, an oil return channel being provided between the dynamic ring and the reducer housing, the dynamic ring and the static ring being plug-in-fitted and there being a gap at the plug-in point, grooves being provided on both sides of the side wall of the static ring, one of the grooves being provided with an oil return hole, the oil return hole connecting the groove and the oil return channel.

[0006] Furthermore, the dynamic ring is installed on the output shaft of the reduction gearbox in an interference fit manner.

[0007] Furthermore, the stationary ring is provided with bolt holes, and the stationary ring is mounted on the side of the reduction box by bolts.

[0008] Furthermore, the dynamic ring is a circular workpiece with a plurality of bosses matching the grooves; the stationary ring is a circular workpiece with grooves.

[0009] When the output shaft of the reduction gearbox is working, centrifugal force is generated during the rotation of the moving ring. At this time, the lubricating oil splashes everywhere in the reduction gearbox. Since the moving ring is installed on the output shaft with an interference fit, the lubricating oil will not flow out along the output shaft, but can only flow out from the boss. The boss of the moving ring is completely embedded in the groove of the static ring. Under the action of the rotating centrifugal force, the lubricating oil is thrown to the surroundings of the groove of the static ring. Under the action of gravity, the lubricating oil flows back to the reduction gearbox from the gap between the groove and the boss through the oil return hole at the outermost groove, thereby achieving the effect of terminal sealing and no oil leakage.

[0010] The invention discloses a terminal sealing device for the output shaft of a reduction box of an oil pumping unit, which has the beneficial effect of using the centrifugal force generated by the rotation of the reduction box to seal the terminal, and the selected materials are all metals, which overcomes the environmental impact and damage to the parts caused by the low temperature in winter and the high temperature in summer; the dynamic ring and the static ring are not in contact, avoiding the damage to the seal caused by friction. Under the action of centrifugal force and gravity, the oil is led back to the reduction box through the oil return hole to ensure that no oil leakage occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 Shown is a cross-sectional schematic diagram of embodiment 1 of the present invention;

[0013] Figure 2 Shown Figure 1 Schematic diagram of the cross section of the middle moving ring;

[0014] Figure 3 The figure shows a top view of the dynamic ring in Example 1;

[0015] Figure 4 Shown Figure 1 Schematic diagram of the cross section of the middle static ring;

[0016] Figure 5 The figure shows a top view of the stationary ring in Example 1.

[0017] As shown in the figure: 1. Moving ring; 2. Stationary ring; 3. Reducer; 4. Reducer output shaft; 5. Boss; 6. Oil return channel; 7. Bolt hole; 8. Bolt; 9. First groove; 10. Second groove; 11. Oil return hole; 12. Clearance.

[0018] Specific implementation methods

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In order to further understand the content of the present invention, the present invention is further described below in conjunction with specific implementation methods.

[0021] Example 1: Figures 1 to 5 As shown, a terminal sealing device for the output shaft of a pumping unit reducer comprises a dynamic ring 1 and a static ring 2 which are sleeved on the output shaft 4 of the reducer. The dynamic ring 1 is installed on the output shaft 4 of the reducer in an interference fit manner. There is an oil return channel 6 between the dynamic ring 1 and the housing of the reducer 3. The static ring 2 is provided with bolt holes 7. The static ring 2 is installed on the side of the housing of the reducer 3 by bolts 8. The static ring 2 is a circular workpiece. Two grooves are respectively provided on both sides of the side wall of the static ring 2. One side of the groove is respectively a first groove 9 and a second groove 10 and an oil return hole 11 is provided. The oil return hole 11 connects the first groove 9, the second groove 10 and the oil return channel 6 between the dynamic ring 1 and the housing of the reducer 3. The dynamic ring 1 is a circular workpiece with a boss 5 matching the groove. The dynamic ring 1 and the static ring 2 are plug-fitted. There is a gap 12 of 0.5 mm between the boss 5 and the groove to prevent mutual friction and heat from burning, and also to provide lubricating oil return.

[0022] When the output shaft 4 of the reduction gearbox is working, centrifugal force is generated during the rotation of the movable ring 1. At this time, the lubricating oil splashes everywhere in the reduction gearbox 3. Since the movable ring 1 is installed on the output shaft 4 of the reduction gearbox with an interference fit, the lubricating oil will not flow out along the output shaft 4 of the reduction gearbox, and can only flow out from the boss 5. The boss 5 of the movable ring 1 is completely embedded in the groove of the static ring 2. Under the action of the rotating centrifugal force, the lubricating oil is thrown to the surroundings of the groove of the static ring 2. Under the action of gravity, the lubricating oil flows from the gap 12 between the groove and the boss 5 through the first groove 9, the oil return hole 11, the second groove 10, the oil return hole 11 and the oil return channel 6 into the reduction gearbox, thereby achieving the effect of terminal sealing and no oil leakage.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A terminal sealing device for the output shaft of a reduction gearbox of an oil pumping unit, characterized in that: The invention comprises a moving ring (1) and a stationary ring (2) which are sleeved on the output shaft (4) of the reduction box. An oil return passage (6) exists between the moving ring (1) and the housing of the reduction box (3). The moving ring (1) and the stationary ring (2) are plug-fitted and a gap (12) exists at the plug-in position. Grooves are respectively provided on both sides of the side wall of the stationary ring (2). One side of the groove is provided with an oil return hole (11). The oil return hole (11) communicates the groove with the oil return passage (6).

2. The terminal sealing device of the output shaft of the reduction gearbox of the oil pumping unit according to claim 1 is characterized in that: The moving ring (1) is installed on the output shaft (4) of the reduction gearbox in an interference fit manner.

3. The terminal sealing device of the output shaft of the reduction gearbox of the oil pumping unit according to claim 1 is characterized in that: The stationary ring (2) is provided with a bolt hole (7), and the stationary ring (2) is mounted on the side of the reduction box (3) by means of bolts (8).

4. The terminal sealing device of the output shaft of the reduction gearbox of the oil pumping unit according to claim 1 is characterized in that: The moving ring (1) is a circular workpiece with a plurality of bosses (5) matched with the grooves.

5. The terminal sealing device of the output shaft of the reduction gearbox of the oil pumping unit according to claim 4 is characterized in that: The stationary ring (2) is a circular workpiece with a groove.

6. The terminal sealing device of the output shaft of the reduction gearbox of the oil pumping unit according to claim 1, characterized in that: The width of the gap (12) is 0.5 mm.

7. A terminal sealing device for an output shaft of a reduction gearbox of an oil pumping unit according to any one of claims 1 to 6, characterized in that: The number of grooves on one side is 2, namely a first groove (9) and a second groove (10).

Images