A motor structure with both sides of universal shaft being driven

Abstract

This utility model discloses a motor structure that can be driven by both universal joints, including a housing and a hollow shaft. The hollow shaft is located inside the housing, and a left universal joint is located inside it. The left universal joint is located inside the hollow shaft and does not extend out of the housing, thereby reducing the size of the motor and achieving a compact and miniaturized design. The rotor of the motor is located on the outer periphery of the hollow shaft. The rotor is connected to the input shaft of the mud pump through the left universal joint, and a torque connecting disc is provided at the right end. Torque transmission between the two universal joints is achieved through an axially penetrating gear sleeve. This structure has good angular compensation capability, eliminates the need for centering adjustment, simplifies disassembly, transportation, and on-site assembly, avoids resonance problems between the motor and the mud pump, and improves system stability and service life. This utility model also achieves bidirectional output through the axial gear sleeve and gear shaft connecting disc, adapting to various drilling rig working conditions, and has the advantages of compact structure, reliable torque transmission, and convenient maintenance.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, specifically to a motor structure that can be driven by both universal joints on both sides. Background Technology

[0002] Mud pumps are one of the core pieces of equipment in oil drilling operations, primarily used to continuously deliver high-pressure mud to the wellhead, achieving key functions such as downhole cooling, rock carrying, and wellbore stabilization. With continuous advancements in drilling technology, the performance of mud pumps is closely related to the reliability and efficiency of their transmission systems. Currently, mud pumps are typically driven in two ways depending on the drilling rig type: mechanical drive and electric motor drive. Electric motor drive is widely used due to its advantages in control flexibility and transmission efficiency.

[0003] Currently, there are two main types of motor-driven mud pumps. The first type uses an intermediate transmission device such as a belt or chain to drive the mud pump. This driving method has a mature structure and relatively mature technology, but due to the presence of the transmission chain or belt, the energy transfer efficiency is low and the mechanical loss is relatively large. At the same time, the tensioning, alignment adjustment, and maintenance of the belt or chain are relatively complex, and after long-term operation, problems such as loosening, slippage, or even breakage are prone to occur, affecting the stable operation of the mud pump.

[0004] The second method involves directly mounting the motor to the mud pump shaft, achieving direct drive through a rigid connection. This method is simple in structure, has a short transmission path, and can significantly improve transmission efficiency and reduce energy loss. However, existing direct-drive mud pump units generally suffer from unreliable installation and fixing methods. Due to insufficient structural rigidity of the connection between the motor housing and the mud pump, the torque transmission capacity is limited, leading to resonance between the motor and the mud pump, further exacerbating shaft vibration. Simultaneously, limited by existing structural designs, the alignment requirements for the motor and mud pump are high, and installation and commissioning are complex, affecting on-site operational efficiency.

[0005] Furthermore, the existing direct-drive structure has not been optimized in terms of its bulky and heavy dimensions, resulting in a large and cumbersome overall equipment that cannot be modularly disassembled, causing significant inconvenience for transportation and on-site installation. Especially when replacing mud pumps or motors on-site, the mismatch between the equipment structure and dimensions often necessitates extensive modifications and adjustments, increasing construction time and costs, and reducing construction efficiency. To address these issues, a motor structure with dual universal joints for driving is proposed. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the existing defects and provide a motor structure that can be driven by both universal joints. The motor structure that can be driven by both universal joints provided by this utility model significantly reduces the size of the motor by integrating the left universal joint into the hollow shaft. It avoids the excessive space occupied by the shaft end of the traditional motor, realizes the compact and miniaturized design of the motor, which is beneficial to the overall layout of the equipment and space utilization, and can effectively solve the problems in the background technology.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a motor structure drivable by both universal joints, comprising a housing and a hollow shaft. The hollow shaft is housed within the housing, and a left universal joint is disposed within the hollow shaft. The left universal joint is located inside the hollow shaft, preventing it from protruding from the housing and occupying significant space, thus greatly reducing the motor's size and achieving a compact and miniaturized design. The load is transmitted via torque through the universal joint, eliminating the need for centering adjustments. Disassembly and transportation are convenient, and on-site assembly is easy. The motor rotor is located on the outer periphery of the hollow shaft, and the rotor is connected to the input shaft of the mud pump via the left universal joint, eliminating the need for installation and adjustment. This solves the problem of motor over-positioning that may occur with other installation methods. This design effectively prevents equipment malfunctions during use and extends the equipment's lifespan. Furthermore, due to the significant angular compensation capability of the left universal joint, it can adaptively adjust its position to compensate for motor vibrations. The motor rotor can be designed as an AC variable frequency motor rotor or a permanent magnet motor rotor. This direct-drive motor design offers convenience to users. A torque connection disc is located at the right end of the rotor, used for load connection. This torque connection disc is bolted to an axially penetrating gear sleeve disc, which has a right bearing. An axial gear sleeve is located in the center hole of the axially penetrating gear sleeve disc, and a left universal joint is located at its left end. The universal joint is screwed to the output shaft of the mud pump. The other side of the axially penetrating gear sleeve disc is connected to the left universal joint via an axial gear sleeve. The other end of the left universal joint is connected to other equipment, enabling bidirectional output.

[0008] Furthermore, the axial gear sleeve is connected to the left universal joint via the left gear shaft connecting plate, and the axial gear sleeve is connected to the right universal joint via the right gear shaft connecting plate. The right universal joint is connected to the drilling equipment via a speed-increasing reducer. If the motor is not compatible with the drilling rig on site, the universal joint can be removed for backup. A hollow cavity is provided inside the hollow shaft. The right bearing is moved to the side of the axial through gear sleeve plate away from the hollow cavity. The inner diameter of the right bearing is smaller than the inner diameter of the bearing near the load end of the mud pump. Although the inner diameter of the right bearing is small, its bearing capacity is greater than that of the bearing near the mud pump.

[0009] Furthermore, vertical end plates are provided at both ends of the casing, and screw holes are provided on the vertical end plates. The vertical end plates are screwed to the base of the mud pump through the screw holes. The motor and mud pump are driven by torque through the left universal joint, which eliminates the need for centering adjustment, facilitates disassembly and transportation, and is convenient for on-site assembly. It also solves the problem of resonance between the motor and mud pump and the power transmission problem when connecting with other equipment.

[0010] Furthermore, due to the large torque borne by the motor shaft, the connection strength between the two connecting discs must be reliable when the torque connecting disc and the axial through gear sleeve are screwed together. Considering the space and performance requirements of the motor, a rectangular groove is provided on the mating surface of the torque connecting disc and the axial through gear sleeve, and a corresponding rectangular protrusion is provided on the axial through gear sleeve. The rectangular groove and the rectangular protrusion cooperate to ensure reliable torque transmission and structural safety. The torque connecting disc and the axial through gear sleeve are tightly connected together using hexagonal flat head screws. The screwing method of the torque connecting disc and the axial through gear sleeve facilitates the replacement of the worn axial through gear sleeve in the future.

[0011] Furthermore, a horizontal base is provided at the bottom of the housing for use when connected to a dual-drive drilling rig. During dual-drive operation, a gap is left between the two universal joint sleeves to prevent damage caused by the extension and retraction of the universal joints. Specifically, the left universal joint connects to one axial sleeve, and the right universal joint connects to the other axial sleeve, with a gap between the two sleeves. The side of the horizontal base has mounting holes for a vertical base. Generally, when using a single-drive mud pump, a spacer block is installed vertically between the housing and the mud pump, connected by screws. Alternatively, depending on the vibration of the mud pump, disc springs can be placed on both sides of the spacer block between the housing and the mud pump. The spacer block and disc springs release vibration force while transmitting torque. Generally, the horizontal base is not used when using a single-drive mud pump.

[0012] Furthermore, a left bearing is provided on the outer side of the hollow shaft, and the left bearing is fixed on the vertical end plate. The hollow shaft is configured as a hollow cavity, and a rotation space is left between the left universal joint and the inner wall of the hollow cavity. In order to take into account the wheel swing and tilt, and to ensure the safety of the structure when rotating, a rotor air duct is provided between the hollow shaft and the rotor.

[0013] Furthermore, a stator is provided on the inner wall of the casing, and coils are wound on the stator. A stator air duct is provided between the outer periphery of the stator core and the casing.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model provides a motor structure that can be driven by both universal joints. By setting the universal joints inside a hollow shaft and configuring a vertical end plate on the side of the motor housing and screwing it to the mud pump base, a compact and reasonable design is achieved. This structure effectively reduces the external size of the motor, avoids the problem of the universal joint extending out and occupying space, and significantly reduces the overall volume of the equipment, realizing the miniaturization and lightweight design of the motor. This design is beneficial for the installation and application of the equipment in space-constrained environments, and also facilitates transportation and integration of the overall system.

[0016] 2. The universal joint connection has strong angular compensation capability, which can adaptively adjust deviations and avoid alignment problems caused by misalignment between the motor and the mud pump. It simplifies the on-site assembly process, improves the convenience of disassembly and transportation, significantly reduces the difficulty and time cost of construction and commissioning, and adapts to complex construction environments and frequent relocation requirements. At the same time, by reasonably optimizing the structural design of the universal joint connection and axial gear sleeve, the torque connection strength of the system is improved, the risk of resonance is reduced, and the smooth power transmission between the motor and the mud pump is ensured. This avoids component fatigue damage caused by system vibration, thereby extending the service life of the entire machine.

[0017] 3. The rectangular groove and raised structure ensure reliable torque transmission and facilitate disassembly and maintenance. When a component is worn or damaged, components such as the axial gear sleeve can be replaced separately, reducing maintenance cycle and cost and improving equipment operation and maintenance efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the torque connecting disc structure of this utility model.

[0020] In the diagram: 1. Bedroom base mounting hole; 2. Vertical base mounting hole; 3. Vertical end plate; 4. Left universal joint; 5. Hollow shaft; 6. Left bearing; 7. Housing; 8. Rotor air duct; 9. Coil; 10. Stator air duct; 11. Left gear shaft connecting plate; 12. Axial gear sleeve; 13. Torque connecting plate; 14. Axial through gear sleeve plate; 15. Right gear shaft connecting plate; 16. Right universal joint; 17. Hollow cavity; 18. Stator; 19. Rotor; 20. Horizontal base; 21. Right bearing; 22. Rectangular groove. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0022] Please see Figure 1-2 This utility model provides a technical solution: a motor structure that can be driven by both universal joints, including a housing 7 and a hollow shaft 5; the hollow shaft 5 is disposed inside the housing 7, and a left universal joint 4 is provided inside the hollow shaft 5; since the left universal joint 4 is disposed inside the hollow shaft 5, the left universal joint 4 does not extend out of the housing 7, greatly reducing the space occupied, thereby reducing the overall size of the motor and realizing a compact and miniaturized design of the motor; in this embodiment, the motor transmits torque to the input shaft of the mud pump through the left universal joint 4, and the power transmission of the load is connected by a universal joint, eliminating the need for traditional centering adjustment, making disassembly, transportation and on-site assembly more convenient and faster; in addition, the left universal joint 4 has a large angular compensation capability, which can adaptively adjust its position according to the vibration of the motor during operation, further improving the stability of the equipment operation.

[0023] In this embodiment, a motor rotor 19 is provided on the outer periphery of the hollow shaft 5. The rotor 19 is connected to the mud pump input shaft via the left universal joint 4. The rotor 19 can be designed as an AC variable frequency motor rotor or a permanent magnet motor rotor according to different application requirements to meet the matching requirements of different types of mud pumps or drilling rig systems. A torque connecting plate 13 is provided at the right end of the rotor 19. The torque connecting plate 13 is used for load connection and is connected to the axial through gear sleeve plate 14 by bolts. An axial gear sleeve 12 is provided in the center hole of the axial through gear sleeve plate 14. A right bearing 21 is provided on the axial through gear sleeve plate 14. The right end of the axial gear sleeve 12 is connected to the right universal joint 16. The end of the right universal joint 16 away from the motor is connected to other equipment.

[0024] The left end of the axial gear sleeve 12 is connected to the left universal joint 4, and the left end of the left universal joint 4 is screwed to the output shaft of the mud pump; the axial gear sleeve 12 in the axial through gear sleeve disc 14 is connected to the mud pump and the left universal joint 4, and the right universal joint 16 is connected to other equipment, thereby realizing bidirectional torque output.

[0025] The axial gear sleeve 12 is connected to the left universal joint 4 via the left gear shaft connecting plate 11, and is also connected to the right universal joint 16 via the right gear shaft connecting plate 15. The right universal joint 16 can be connected to the drilling equipment via a speed-increasing reducer. When the motor cannot be matched with the drilling rig on site, the universal joint assembly can be taken out for backup to improve the versatility and flexibility of the system.

[0026] The motor housing 7 has vertical end plates 3 at both ends, and screw holes are provided on the vertical end plates 3. The motor housing 7 can be fixed to the base of the mud pump through these screw holes. The torque transmission between the motor and the mud pump is completed by the left universal joint 4. The structure is simplified and no centering adjustment is required. This solves the resonance problem caused by asynchrony or poor centering in the traditional structure and ensures stable transmission between the motor and the mud pump.

[0027] When the torque connecting disc 13 and the axial through gear sleeve disc 14 are mated, a rectangular groove 22 and a corresponding rectangular protrusion are provided. The cooperation between the two ensures the reliability and stability of torque transmission. The torque connecting disc 13 and the axial through gear sleeve disc 14 are tightly connected by hexagonal flat head screws, which not only ensures structural strength but also facilitates disassembly and maintenance. When the axial through gear sleeve disc 14 is worn or damaged, it can be quickly disassembled and replaced, reducing maintenance costs and time.

[0028] In another embodiment, a horizontal base 20 is provided at the lower part of the housing 7 for use when connected to the drilling rig in a dual-drive configuration. In dual-drive mode, the left universal joint 4 is connected to one axial gear sleeve 12, and the right universal joint 16 is connected to another axial gear sleeve 12. A certain gap is left between the two axial gear sleeves 12 to prevent them from colliding and being damaged when the universal joints extend or retract. In single-drive mud pump applications, the housing 7 and the mud pump can be connected by a spacer block. Disc springs can pass through both sides of the spacer block according to the vibration of the mud pump, releasing vibration force while transmitting torque, further enhancing the vibration resistance of the equipment. In single-drive applications, the horizontal base 20 does not need to be connected to any base.

[0029] A left bearing 6 is provided on the outer side of the hollow shaft 5, and the left bearing 6 is fixed on the vertical end plate 3; a hollow cavity 17 is formed inside the hollow shaft 5, and a rotation space is left between the left universal shaft 4 and the inner wall of the hollow cavity 17 to adapt to changes in wheel swing and tilt, and to ensure that the structure remains safe and reliable during rotation; a rotor air duct 8 is provided between the hollow shaft 5 and the rotor 19 to improve the motor cooling efficiency.

[0030] An air intake is located on the back of the housing 7, and an exhaust is located on the lower part of the underside of the housing 7. A powerful fan is screwed onto the back of the housing 7, allowing the strong air to enter the internal air duct of the housing 7 and flow out at the lower part of the underside of the housing 7, thus completing the heat circulation inside the motor. A stator 18 is installed on the inner wall of the housing 7, and a coil 9 is wound on the stator 18. A stator air duct 10 is installed between the outer periphery of the stator core and the housing 7. Through the reasonable air duct design, efficient heat dissipation of the motor system is achieved, ensuring long-term stable operation of the equipment under high load conditions.

[0031] As can be seen from the above specific embodiments, the motor structure with dual universal joints that can be driven by this utility model has the advantages of compact structure, flexible installation, reliable torque transmission, and simple maintenance. It adapts to the working conditions of complex drilling rigs and mud pumps, and significantly improves the safety and efficiency of system operation.

[0032] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A motor structure that can be driven by both universal joints, comprising a housing (7) and a hollow shaft (5), characterized in that: A hollow shaft (5) is installed in the housing (7). A left universal joint (4) is installed in the hollow shaft (5). A motor rotor (19) is installed on the outer periphery of the hollow shaft (5). A torque connecting plate (13) is installed at the right end of the rotor (19). The torque connecting plate (13) is used for load connection. An axially penetrating gear sleeve plate (14) is connected to the torque connecting plate (13) by bolts. A right bearing (21) is installed on the axially penetrating gear sleeve plate (14). An axial gear sleeve (12) is installed in the center hole of the axially penetrating gear sleeve plate (14). A right universal joint (16) is installed at the right end of the axially penetrating gear sleeve plate (14). The left universal joint (4) is connected to the other side of the axially penetrating gear sleeve plate (14) through the axial gear sleeve (12).

2. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: The axial gear sleeve (12) is connected to the left universal joint (4) through the left gear shaft connecting plate (11), and the axial gear sleeve (12) is connected to the right universal joint (16) through the right gear shaft connecting plate (15).

3. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: Vertical end plates (3) are provided at both ends of the housing (7). The vertical end plates (3) are provided with screw holes, and the vertical end plates (3) are screwed to the base of the mud pump through the screw holes.

4. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: A rectangular groove (22) is provided on the mating surface of the torque connecting plate (13) and the axial through gear sleeve plate (14), and a corresponding rectangular protrusion is provided on the axial through gear sleeve plate (14). The torque connecting plate (13) and the axial through gear sleeve plate (14) are connected together by internal hexagon flat round head screws.

5. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: The lower part of the housing (7) is provided with a horizontal base (20), the left universal joint (4) is connected to an axial gear sleeve (12), the right universal joint (16) is connected to another axial gear sleeve (12), and there is a gap between the two axial gear sleeves (12). The side of the horizontal base (20) is provided with a vertical base mounting hole (2).

6. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: A left bearing (6) is provided on the outside of the hollow shaft (5). The left bearing (6) is fixed on the vertical end plate (3). The hollow shaft (5) is configured as a hollow cavity (17). There is a rotation space between the left universal joint (4) and the inner wall of the hollow cavity (17). A rotor air duct (8) is provided between the hollow shaft (5) and the rotor (19).

7. The motor structure that can be driven by both universal joints according to claim 1, characterized in that: The inner wall of the housing (7) is provided with a stator (18), and a coil (9) is wound on the stator (18). A stator air duct (10) is provided between the stator (18) and the inner wall of the housing (7).

Images