Hollow-rotor-based mine hole bottom motor universal shaft

Abstract

The utility model discloses a kind of mine hole bottom motor universal shaft based on hollow rotor design, belong to coal mine underground directional drilling technical field, the universal shaft includes hole end connector, the one end of hole end connector is connected with the tapered surface between hollow connecting rod, pressure transmission ball is installed on the tapered surface between hole end connector and the hollow connecting rod, the middle part of hole end connector is provided with passageway, the hollow connecting rod is hollow design, the passageway of hole end connector and the inside of the hollow connecting rod constitute hollow passageway.The utility model uses above-mentioned one kind of mine hole bottom motor universal shaft based on hollow rotor design, significantly improve the functionality and efficiency of mine hole bottom motor, especially in measurement while drilling aspect, bring more accurate, reliable measurement solution to coal mine underground directional drilling operation.

Description

Technical Field

[0001] This utility model belongs to the field of directional drilling technology in coal mines, specifically relating to a universal joint shaft for a mine bottom motor based on a hollow rotor design. Background Technology

[0002] In directional drilling operations in coal mines, the bottom hole motor is one of the key pieces of equipment. Traditional mining bottom hole motors mostly use a solid rotor design, while in the oil drilling field, some large-sized bottom hole motors use a hollow rotor design to reduce rotational inertia and improve cooling performance. However, due to the smaller diameter of mining bottom hole motors, hollow rotors are usually not used.

[0003] During borehole data acquisition, measurement-while-drilling (MWD) instruments are typically installed behind the bottom-hole motor to transmit the acquired data to the borehole opening, completing the entire MWD process, including acquisition, transmission, and wellhead processing. However, this installation method presents a significant problem: due to the considerable distance between the measuring instrument and the drill bit (usually exceeding 7 meters), the measurement results cannot directly reflect the actual conditions at the drill bit, especially when measuring lithology and trajectory, resulting in substantial errors and increasing repetitive and ineffective work during construction. Therefore, a new technical solution is urgently needed to allow the measuring instrument to be installed closer to the drill bit than the bottom-hole motor, in order to improve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a universal joint for a mine bottom hole motor based on a hollow rotor design. This device significantly improves the functionality and efficiency of the mine bottom hole motor, especially in measurement while drilling, providing a more accurate and reliable measurement solution for directional drilling operations in coal mines.

[0005] To achieve the above objectives, this utility model provides a universal joint for a mine hole bottom motor based on a hollow rotor design, including a perforated end connector. A tapered surface is provided between one end of the perforated end connector and the hollow connecting rod. A pressure-bearing transmission ball is installed on the tapered surface between the perforated end connector and the hollow connecting rod. A channel is provided in the middle of the perforated end connector. The hollow connecting rod is hollow. The channel of the perforated end connector and the interior of the hollow connecting rod form a hollow channel.

[0006] Preferably, the angle of the tapered surface matches the bottom motor of the hole.

[0007] Preferably, an external seal is provided above the pressure-bearing transmission ball, the external seal being a rubber sealing ring, and a first groove is provided at the external joint between the perforated end connector and the hollow connecting rod, with the rubber sealing ring placed in the first groove.

[0008] Preferably, the hollow connecting rod has a third groove on its inner side, and the perforated end connector has a second groove.

[0009] Preferably, an internal seal is provided above the pressure-bearing transmission ball. The internal seal is a floating sealing ring, with the stationary ring of the floating sealing ring installed in the second groove and the moving ring of the floating sealing ring installed in the third groove.

[0010] Preferably, the hollow channel extends through the perforated end connector and the hollow connecting rod, and a cable is installed inside the hollow channel.

[0011] Therefore, the universal joint of the mine hole bottom motor based on the hollow rotor design described above has the following significant advantages compared with the prior art:

[0012] (1) The present invention designs the rotor of the hole bottom motor as a hollow structure. Through this design, wired data transmission (power supply) through the hole bottom motor is realized, so that the measuring instrument can be installed closer to the drill bit, thereby improving the accuracy and directness of the measurement results and reducing the measurement error caused by distance.

[0013] (2) This utility model can adjust the angle of the tapered surface according to different working conditions, which enhances the adaptability and reliability of the device;

[0014] (3) The excellent sealing performance of this utility model not only protects the internal components from the influence of the external environment, but also ensures the safety of communication and power supply cables, and improves the stability and durability of the system.

[0015] (4) This utility model adopts wired communication, which solves the problem of long-term construction and use of instruments near the drill bit, and is not limited by battery power, thus enhancing the practicality of the system in actual engineering applications.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a communication-enabled universal joint for a mine hole bottom motor based on a hollow rotor design, according to this utility model.

[0018] Figure Labels

[0019] 1. Perforated end connector; 2. Pressure-bearing transmission ball; 3. Hollow connecting rod; 4. External seal; 5. Internal seal; 6. Tapered surface; 7. Hollow channel; 8. First groove; 9. Second groove; 10. Third groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by those skilled in the art.

[0021] Example 1

[0022] like Figure 1 As shown, this utility model discloses a universal joint for a mine hole-bottom motor based on a hollow rotor design. It includes a perforated end connector 1. One end of the perforated end connector 1 has a tapered surface 6 between it and a hollow connecting rod 3. One end of a pressure-bearing transmission ball 2 is embedded in the tapered surface 6 of the perforated end connector 1, and the other end contacts the hollow connecting rod 3. The perforated end connector 1 is connected to the hollow connecting rod 3 through the pressure-bearing transmission ball 2. A channel is provided in the middle of the perforated end connector 1. The hollow connecting rod 3 is hollow, and the channel of the perforated end connector 1 and the hollow part of the hollow connecting rod 3 form a hollow channel 7. The hollow channel 7 passes through the perforated end connector 1 and the hollow connecting rod 3.

[0023] The pressure-bearing drive ball 2 withstands the axial pressure from the drilling process and can rotate freely when the angle of the universal joint changes, ensuring effective torque transmission. The angle of the tapered surface 6 can be adjusted according to different bottom hole motor specifications, axial force, and rotational torque values ​​to adapt to various working conditions. The pressure-bearing drive ball 2, through the tapered surface 6, fits tightly with the perforated end connector 1 and the hollow connecting rod 3, ensuring effective power transmission even when the angle changes, and maintaining the sealing and integrity of the hollow channel 7 to ensure smooth cable passage.

[0024] An external seal 4 is provided above the pressure-bearing transmission ball 2. The external seal 4 is a shaped hybrid material (or rubber) sealing ring. A first groove 8 is provided at the external joint between the perforated end connector 1 and the hollow connecting rod 3. The shaped hybrid material (or rubber) sealing ring is placed in the first groove 8. The function of the external seal 4 is to prevent external environment (such as drilling fluid) from entering the universal joint, and at the same time protect the internal components from the influence of external contaminants.

[0025] An internal seal 5, a floating sealing ring, is located below the pressure-bearing transmission ball 2. The internal seal 5 is installed at the internal junction of the hollow connecting rod 3 and the perforated end connector 1. A third groove 10 is provided on the inner side of the hollow connecting rod 3, and a second groove 9 corresponding to the third groove 10 is provided on the perforated end connector 1. The stationary ring of the floating sealing ring is installed in the second groove 9, and the moving ring of the floating sealing ring is installed in the third groove 10. The function of the internal seal 5 is to ensure lubrication of the pressure-bearing transmission ball 2 and its surrounding area, and to prevent lubricant leakage into the hollow channel 7, thereby protecting the safety of communication and power cables. Even when the pressure-bearing transmission ball 2 has a slight angular deflection (≤10°), the sealing surface can automatically adjust to maintain tight contact, thus ensuring a sealing effect.

[0026] The hollow channel 7 runs through the perforated end connector 1 and the hollow connecting rod 3. The pressure-bearing transmission ball 2 bears both axial pressure and transmits rotational torque, while ensuring the continuity of the hollow channel 7. The perforated end connector 1 not only transmits power but also provides a safe passage for communication and power cables through its central hollow channel 7. The hollow channel 7 is used to install communication and power cables, ensuring that data can be transmitted from near-drill bit measuring instruments to the borehole opening, enabling data communication across the bottom-of-hole motor. Furthermore, the design of the hollow channel 7 allows for a certain range of angular oscillation to accommodate small angle changes that may occur during operation, protecting the cables from damage.

[0027] All the aforementioned technical features work together to ensure the implementation of the wired cross-hole bottom motor communication transmission (power supply) solution with hollow channel wiring. This solution offers higher reliability and longer operating time, solving the battery power limitation problem inherent in wireless solutions. In particular, the effective combination of the hollow rotor design, the improved universal joint design, and the sealing device enables the system to maintain high efficiency and stable performance in complex working environments.

[0028] Therefore, this utility model adopts a universal joint for a mine bottom hole motor based on a hollow rotor design, which significantly improves the functionality and efficiency of the mine bottom hole motor, especially in the field of measurement while drilling, providing a more accurate and reliable measurement solution for directional drilling operations in coal mines.

[0029] 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 or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A mine borehole motor universal shaft based on a hollow rotor design, characterized in that, The device includes a perforated end connector, one end of which has a tapered surface between itself and a hollow connecting rod. A pressure-bearing transmission ball is installed on the tapered surface between the perforated end connector and the hollow connecting rod. A channel is provided in the middle of the perforated end connector. The hollow connecting rod is hollow in design. The channel of the perforated end connector and the interior of the hollow connecting rod form a hollow channel.

2. A mine borehole motor cardan shaft based on a hollow rotor design according to claim 1, characterized in that, The angle of the tapered surface is matched with the bottom motor.

3. A mine borehole motor cardan shaft based on a hollow rotor design according to claim 1, characterized in that, An external seal is provided above the pressure-bearing transmission ball. The external seal is a rubber sealing ring. A first groove is provided at the external joint of the perforated end connector and the hollow connecting rod. The rubber sealing ring is placed in the first groove.

4. A mine borehole motor universal shaft based on a hollow rotor design according to claim 1, characterized in that, The hollow connecting rod has a third groove on its inner side, and the perforated end connector has a second groove.

5. A mine borehole motor cardan shaft based on a hollow rotor design according to claim 4, characterized in that, An internal seal is provided above the pressure-bearing transmission ball. The internal seal is a floating sealing ring. The stationary ring of the floating sealing ring is installed in the second groove, and the moving ring of the floating sealing ring is installed in the third groove.

6. A mine borehole motor universal shaft based on a hollow rotor design according to claim 1, characterized in that, The hollow channel passes through the perforated end connector and the hollow connecting rod, and a cable is installed inside the hollow channel.

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