Double-sealing key column universal shaft

Abstract

The utility model belongs to the technical field of hydraulic oscillators, and particularly relates to a double-sealing key column universal shaft which comprises a transmission key rod, and movable hinge mechanisms of the same structure are installed at the two ends of the transmission key rod respectively. The movable hinge mechanism comprises a movable hinge, a ball seat, a transmission key column, a ball head, a first locking sleeve, a second locking sleeve, a rectangular sealing ring, a lip-shaped sealing ring, a hose clamp, a rubber sheath and a pressing ring. According to the technical scheme, the sealing life of the cardan shaft is doubled, the torque transmission stress of the transmission key column, the movable hinge and the key rod is more uniform, the anti-scraping groove is additionally arranged, the key column is prevented from being scratched by the movable hinge and the key rod in the torque transmission process, the service life of a main body part is prolonged, and cost is reduced and efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw drill tools, and in particular relates to a double-sealed key column universal shaft. Background Art

[0002] Screw drill bits have become an indispensable drilling tool in drilling operations. They play an especially important role in special processes such as directional wells, horizontal wells, and extended reach wells in petroleum, geological exploration, geothermal wells, and coalbed methane mining. Screw drill bits used in oil exploration are generally composed of a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal shaft assembly, and a drive shaft. The function of the universal shaft assembly is to convert the torque generated by the planetary motion of the motor rotor into a fixed-axis torque, and to smoothly transmit the torque and speed generated by the motor to the drill bits used for drilling. With the continuous strengthening of drilling parameters for energy geological exploration (the drilling pressure has increased by more than 1.5 times), the output performance of the screw drill bit motor has also been continuously improved with the strengthening of drilling parameters; high-strength ball-column universal shafts sometimes have ball-column scratches and seal sleeve damage. Utility Model Content

[0003] The utility model aims to provide a double-sealed key column universal shaft to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-sealed key column universal shaft, characterized in that it includes a transmission key rod, and the two ends of the transmission key rod are respectively equipped with a live hook mechanism with the same structure, and the live hook mechanism includes a live hook, a ball seat, a transmission key column, a ball head, a first locking sleeve, a second locking sleeve, a rectangular sealing ring, a lip sealing ring, a throat clamp, a rubber sheath and a pressure ring; the ball seat is fixed to the bottom of the inner hole of the live hook, and the two ends of the live hook are circumferentially fixed with key grooves, and the transmission key column is installed in the key groove, the first locking sleeve fixes the rectangular sealing ring on the live hook, the rectangular sealing ring cooperates with the side wall of the inner hole of the live hook, one end of the pressure ring is connected to one end of the lip sealing ring, and the lip sealing ring is connected to the inner hole of the live hook through the second, one end of the rubber sheath is located between the lip sealing ring and the pressure ring, and the other end of the rubber sheath is fixed to the transmission key rod through the throat clamp. The ball column on the original ball column universal shaft is removed, and the ball column is replaced with a transmission key column (anti-scratch grooves are added to the transmission key column), and the key rod of the double-sealed key column universal shaft is processed into a 6-key groove shape, and a lip-shaped and rectangular inner seal ring is added between the live twist and the locking sleeve, so that the universal shaft will not scratch the key column when the live twist and the key rod are transmitted under the planetary rotation of the motor. The key column has a longer service life and more uniform force. The seal adopts an internal and external seal double seal structure. Even if one of the seals is damaged or broken, it will not cause the universal shaft to fail prematurely, effectively improving the service life of the sealing structure. Double-sealed key column universal shaft: The seal is more stable with double-layer protection, uniform force, flexible swing, and the transmission parts are not easy to be damaged. The anti-scratch transmission key column effectively improves the service life of the live twist and key rod parts.

[0005] Preferably, there are six healthy grooves evenly distributed around the circumference of the live strand.

[0006] Preferably, a scratch-proof groove is provided on the side of the transmission key column.

[0007] Preferably, the movable hitch is provided with an oil filling hole connected with the keyway, and a screw plug is installed on the oil filling hole.

[0008] Preferably, the anti-scratch groove is located in the middle area of ​​the side of the transmission key column, at a position corresponding to the edge of the key slot.

[0009] Preferably, the anti-scratch groove is oval.

[0010] The beneficial effects of the utility model are as follows: through the technical solution, the service life of the universal shaft seal is doubled, the transmission key column and the live twist and key rod transmit torque more evenly, and anti-scratch grooves are added to prevent the live twist and key rod from scratching the key column during torque transmission, thereby increasing the service life of the main components and reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is an overall diagram of the utility model;

[0012] Figure 2 It is a schematic diagram of the upper structure of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the lower half of the utility model;

[0014] Figure 4 It is a three-dimensional diagram of the transmission key column in the utility model;

[0015] Figure 5 It is a position diagram of the keyway in the utility model. DETAILED DESCRIPTION

[0016] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0017] like Figure 1-5 As shown, a dual-sealed key column universal shaft includes a transmission key rod 8, and the two ends of the transmission key rod are respectively installed with a live hook mechanism of the same structure, and the live hook mechanism includes a first live hook 1, a ball seat 2, a transmission key column 3, a ball head 4, a first locking sleeve 5, a rectangular sealing ring 6, a lip sealing ring 7, a throat clamp 8, a rubber sheath 10, a second locking sleeve 11, a pressure ring 12, a second live hook 13 and a plug 14; the ball seat is fixed to the bottom of the inner hole of the live hook, and the two ends of the live hook are circumferentially fixed with key grooves, and the transmission key column is installed in the key groove, as shown in FIG. Figure 5 As shown, due to long-term use, the position where the edge of the keyway contacts the transmission key column is prone to wear. For this reason, an anti-scratch groove 15 is set at this position of the transmission key column. The side of the transmission key column is provided with an anti-scratch groove 15. The anti-scratch groove is located in the middle area of ​​the side of the transmission key column, corresponding to the position on the edge of the keyway. The anti-scratch groove is elliptical. The ball column is changed into a key column, and the anti-scratch groove is machined on the key column. The column groove on the transmission key rod is changed into a key groove. The key column will not be scratched during the transmission torque of the live hook and the transmission key rod. The key column bypasses the edges of the live hook and the transmission key rod through the anti-scratch groove; the service life of the transmission key column is effectively improved, the force is more evenly applied, and the operation is smooth.

[0018] The first locking sleeve fixes the rectangular sealing ring on the live hook, the rectangular sealing ring cooperates with the inner hole side wall of the live hook, one end of the pressure ring is connected to one end of the lip sealing ring, the lip sealing ring is connected to the inner hole of the live hook through the second, one end of the rubber sheath is located between the lip sealing ring and the pressure ring, and the other end of the rubber sheath is fixed to the transmission key rod through the throat clamp. The live hook is provided with an oil filling hole connected to the key slot, and a screw plug is installed on the oil filling hole.

[0019] During installation, apply grease to the ball seat 2 and install it into the first live hook 1 and the second live hook 13; the first locking sleeve 5 and the second locking sleeve 11 are installed at both ends of the transmission key rod 8; the rubber sleeve 10 is installed at both ends of the transmission key rod 8; the pressure ring 12 is installed in the rubber sleeve 10; the lip seal ring 7 is installed at both ends of the transmission key rod 8; the rectangular seal ring 6 is installed at both ends of the transmission key rod 8; the transmission key column 3 is installed in the keyway of the transmission key rod 8; the ball head 4 is installed in the center inner hole at both ends of the transmission key rod 8; the first live hook 1 is connected to the locking sleeve 5; the second live hook 13 is connected to the second locking sleeve 11; the throat clamp 9 locks the rubber sleeve 10; after standing up and injecting high-temperature grease, the screw plug 11 is connected to the first live hook 1 and the second live hook 13 and tightened. The double-seal key column universal shaft adopts the method of internal and external double seals. Compared with the conventional single seal sleeve, when the outer seal sleeve is damaged due to drilling particles or other reasons, the inner seal of the double-seal key column universal shaft will play a secondary seal of the transmission mechanism of the universal shaft, and will not fail prematurely due to the damage of the outer seal sleeve; the double seal structure, the sealing system is more stable than the single seal structure, so the service life of the universal shaft is also effectively extended. The double-seal structure universal shaft can adapt to high well temperatures, and the inner lip seal and rectangular seal can adopt a fluororubber structure. Since the two inner seals are all close to the central swing area, when the double-seal key column universal shaft is running and swinging, the lip seal ring is less deformed and more stable at high temperatures.

[0020] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A dual-seal key column universal shaft, characterized in that: It includes a transmission key rod, and both ends of the transmission key rod are respectively equipped with a live hook mechanism of the same structure, and the live hook mechanism includes a live hook, a ball seat, a transmission key column, a ball head, a first locking sleeve, a second locking sleeve, a rectangular sealing ring, a lip sealing ring, a throat clamp, a rubber sheath and a pressure ring; the ball seat is fixed to the bottom of the inner hole of the live hook, and both ends of the live hook are circumferentially fixed with key grooves, and the transmission key column is installed in the key groove, the first locking sleeve fixes the rectangular sealing ring on the live hook, the rectangular sealing ring cooperates with the side wall of the inner hole of the live hook, one end of the pressure ring is connected to one end of the lip sealing ring, and the lip sealing ring is connected to the inner hole of the live hook through the second locking sleeve, one end of the rubber sheath is located between the lip sealing ring and the pressure ring, and the other end of the rubber sheath is fixed to the transmission key rod through the throat clamp.

2. The dual-sealed key column universal shaft according to claim 1, characterized in that: There are six keyways evenly distributed around the circumference of the live twist.

3. The dual-sealed key column universal shaft according to claim 1, characterized in that: The side of the transmission key column is provided with an anti-scratch groove.

4. The dual-sealed key column universal shaft according to claim 1, characterized in that: The movable hitch is provided with an oil filling hole communicated with the keyway, and a screw plug is installed on the oil filling hole.

5. The dual-sealed key column universal shaft according to claim 3, characterized in that: The anti-scratch groove is located in the middle area of ​​the side of the transmission key column, at a position corresponding to the edge of the key slot.

6. The dual-sealed key column universal shaft according to claim 3, characterized in that: The anti-scratch groove is oval.

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