A motor structure for shortening the distance between a motor and a mud pump
By using a design that flexibly connects the motor to the mud pump's male wheel inside the motor, the problems of unreliable installation and excessive spacing in direct-drive motor devices are solved, achieving improved equipment compactness and transmission efficiency. This design is suitable for space-constrained applications in oil drilling engineering.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河南全新机电设备有限公司
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-05
AI Technical Summary
In existing direct-drive mud pump units, the fixed installation between the motor and the mud pump is unreliable, the bearings are prone to damage, the axial connection accuracy is insufficient, and the spacing is too large, resulting in non-compact equipment, large footprint, and affecting modular integration and well site space utilization.
It adopts a structure in which the male coupling extends horizontally into the motor and is flexibly connected to the female coupling horizontally. The male and female couplings are connected, which simplifies installation and maintenance. The design is compact, eliminates the intermediate transmission mechanism, and uses a flexible connection to compensate for axial and radial deviations.
It significantly shortens the distance between the motor and the mud pump, improves transmission efficiency, simplifies the installation process, and enhances the compactness and stability of the equipment, making it suitable for well sites with limited space and modular drilling rig platforms.
Smart Images
Figure CN224329319U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mud pump motor technology, specifically to a motor structure that shortens the distance between the motor and the mud pump. Background Technology
[0002] Mud pumps are core equipment in oil drilling engineering used to deliver high-pressure mud downhole, playing a vital role in ensuring operational safety. Mud plays multiple roles during drilling, including carrying cuttings, cooling the drill bit, and stabilizing the wellbore. Therefore, the stable operation of mud pumps is crucial to the safety and efficiency of the entire drilling system.
[0003] With technological advancements, the driving method of mud pumps has gradually evolved from traditional fuel-powered or hydraulically driven systems to electric drive structures powered by electric motors. Initially, belt drives or chain drives were widely used to transmit power from the motor to the mud pump. However, these transmission methods suffer from drawbacks such as bulky structure, low efficiency, and frequent maintenance, and have been gradually replaced by the more compact and efficient direct-drive (direct drive) method.
[0004] However, existing direct-drive mud pump units still have many engineering problems that need to be solved, mainly in the following aspects: the method of driving mud pumps by motors has evolved from belt or chain transmission to direct drive. Direct drive often leads to unreliable fixed installation, which makes the motor bearings prone to damage and greatly reduces the service life of the motor; the axial connection accuracy between the motor and the mud pump is insufficient, which in turn affects the life of the motor bearings; the distance between the motor and the mud pump is too large, the equipment layout is not compact, and the space occupied is large. This not only affects modular integration and transportation efficiency, but also limits the rational use of well site space resources.
[0005] In summary, although direct-drive mud pumps have significant advantages in improving transmission efficiency and reducing system complexity, existing technologies still have many shortcomings in terms of structural compactness and ease of maintenance. Therefore, a motor structure that shortens the distance between the motor and the mud pump is proposed, which effectively reduces the distance between the motor and the mud pump to improve the overall performance and application adaptability of the mud pump drive system. 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 shortens the distance between the motor and the mud pump. The male coupling extends horizontally into the motor and is flexibly connected to the female coupling on the rotor, thus shortening the distance between the motor and the mud pump. The male and female coupling docking structure simplifies the installation, disassembly and maintenance process. The compact design reduces the floor space. The motor directly drives the mud pump, improving the transmission efficiency. This can effectively solve the problems in the background art.
[0007] To achieve the above objectives, this utility model provides the following technical solution: a motor structure for shortening the distance between a motor and a mud pump, comprising a motor base, a support platform, a connecting plate, a motor housing, and a male and female mud pump coupling. The motor base is mounted on a support platform welded to the right side of the mud pump body. A front end cover and a rear end cover are respectively provided at the front and rear ends of the motor housing. The connecting plate is located between the front end cover and the mud pump. The motor housing contains a motor stator, stator core coil, motor rotor, fixed shaft, and female coupling. The male and female mud pump coupling extends horizontally into the motor and is flexibly connected to the female coupling horizontally. The fixed shaft is screwed to the inner side of the rear end cover. A bearing one is installed on the side of the fixed shaft near the female coupling, and a bearing two is installed on the other side. After the fixed shaft is fixed to the rear end cover, it is screwed to the motor housing. A rotor inner sleeve is provided on the inner side of the motor rotor. The side of the motor rotor near the mud pump is screwed to the female coupling, and a bearing is installed in the inner hole on the other side of the rotor.
[0008] Furthermore, the inner hole on the left side of the connecting plate is concentrically positioned with the outer bearing of the mud pump, and the right side of the connecting plate is concentric with the front cover and is fixedly connected with screws. The side opening in the middle of the connecting plate facilitates oil injection and adjustment of the wheel angle.
[0009] Furthermore, the inner hole on the left side of the connecting plate is larger than the diameter of the male coupling of the mud pump, so that the male coupling of the mud pump can be inserted into the connecting plate and the motor. A transition washer is provided between the inner hole on the left side of the connecting plate and the outer thread of the bearing. This transition washer can fill the gap between the inner hole on the left side of the connecting plate and the outer thread of the bearing, so as to facilitate installation and achieve concentric positioning. When there is an assembly gap between the inner hole on the left side of the connecting plate and the outer thread of the mud pump bearing, a transition washer can be inserted therein. The outer diameter of the transition washer matches the left hole of the connecting plate, and the inner diameter matches the outer thread of the bearing. This structure forms a dimensional transition and concentric fit relationship between the three. The principle is to use the transition washer to fill the dimensional difference between the connecting plate and the outer thread of the bearing, so as to ensure accurate alignment during the insertion of the male coupling of the mud pump into the motor, prevent vibration and wear caused by eccentric operation, and thus improve the meshing accuracy of the coupling and the overall assembly reliability.
[0010] Furthermore, reinforcing ribs are welded to the outer periphery of the inner sleeve of the rotor to facilitate ventilation and heat dissipation of the motor rotor core.
[0011] Furthermore, the bearings on the fixed shaft closer to the mud pump are either self-aligning cylindrical roller bearings or single-row cylindrical roller bearings, while the bearings further away from the mud pump are also self-aligning cylindrical roller bearings. An oil injection pipe is installed in the inner hole of the fixed shaft to inject oil into the bearings.
[0012] Furthermore, a sealed protective ring is provided between the inside of the right side of the front cover and the outer circumference of the female coupling, so as to achieve the purpose of dust prevention for the motor coil.
[0013] Furthermore, the front cover is fixed to the right side of the mud pump with screws and nuts to ensure that the distance between the motor and the mud pump is relatively fixed.
[0014] The motor rotor is screwed to the female wheel on the side near the mud pump. The female wheel can be replaced if it is worn. The female wheel can be removed and replaced from the side. On the other hand, it is convenient to fit the inner sleeve of the rotor with the inner diameter of the motor rotor.
[0015] The female coupling and the male coupling of the mud pump are flexibly connected by claw couplings, drum gear couplings, and pin couplings.
[0016] Compared with the prior art, the beneficial effects of this utility model are:
[0017] 1. By extending the male coupling of the mud pump horizontally into the motor and flexibly connecting it with the female coupling located at the end of the motor rotor, an integrated coupling system is formed. This structural innovation breaks the design limitation of traditional motors and mud pumps requiring a large axial distance for coupling installation and maintenance, significantly shortening the axial distance between the motor and mud pump and effectively compressing the overall equipment length. This structure not only significantly improves the compactness and layout flexibility of the whole machine, making it particularly suitable for well sites or modular drilling rig platforms with limited space, but also facilitates the integrated configuration of equipment transportation and installation operations.
[0018] 2. The arrangement of directly driving the mud pump with a motor eliminates intermediate transmission mechanisms such as belts and chains, effectively reducing transmission losses and improving the overall transmission efficiency. On this basis, the male and female couplings adopt a flexible connection structure, which can automatically compensate for certain axial and radial deviations, avoiding bearing overload and premature wear of couplings due to installation errors. At the same time, it improves the durability of the drive system and the stability of the whole machine.
[0019] 3. Since the male coupling extends into the motor and connects with the female coupling, the alignment and connection of the entire coupling system can be completed simultaneously during motor installation, avoiding the cumbersome process of multiple alignment adjustments and step-by-step installation of couplings required in traditional systems. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of this utility model.
[0021] In the diagram: 1 Fixed shaft, 2 Reinforcing rib plate, 3 Motor rotor, 4 Motor base, 5 Bearing 1, 6 Support platform, 7 Sealing ring protective ring, 8 Female coupling, 9 Bearing outer thread, 10 Mud pump male coupling, 11 Transition washer, 12 Connecting disc, 13 Screw nut, 14 Front end cover, 15 Motor housing, 16 Motor stator, 17 Stator core coil, 18 Rotor inner sleeve, 19 Rear end cover, 20 Bearing 2. Detailed Implementation
[0022] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "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
[0023] Please see Figure 1 This utility model provides a technical solution: a motor structure for shortening the distance between the motor and the mud pump, including a motor base 4, a motor housing 15, a connecting plate 12, a male mud pump wheel 10, a female mud pump wheel 8, a fixed shaft 1, a rotor inner sleeve 18, a motor rotor 3, a motor stator 16, a front end cover 14, a rear end cover 19, a stator core coil 17, a bearing 1, a bearing 20, and other structural components.
[0024] The motor base 4 is installed on the support platform 6 welded on the right side of the mud pump body. The connecting plate 12 is located between the front cover 14 and the mud pump. The left inner hole of the connecting plate 12 is concentrically positioned with the outer buckle 9 of the mud pump bearing, and the right side is concentrically positioned with the front cover 14 of the motor and is screwed together.
[0025] The male wheel 10 of the mud pump extends horizontally into the motor and is flexibly connected to the female wheel 8 of the motor rotor 3, which is screwed to the side near the mud pump. The fixed shaft 1 is installed inside the rear end cover 19 of the motor. Bearing 5, which is a self-aligning cylindrical roller bearing, is installed on the side near the female wheel 8. Bearing 20, which is a single-row cylindrical roller bearing, is installed on the side away from the female wheel 8. After the fixed shaft 1 is fixed to the rear end cover 19, it is screwed to the motor housing 15. The motor rotor 3 is installed on the outer periphery of the fixed shaft 1 through the rotor inner sleeve 18. The female wheel 8 is screwed to the side near the mud pump. The inner hole of the rotor 3 away from the mud pump is equipped with a bearing. The motor stator 16 and the stator core coil 17 are fixedly installed inside the motor housing 15.
[0026] The above structure enables the male coupling 10 of the mud pump to extend horizontally into the motor and flexibly connect with the female coupling 8, effectively shortening the installation distance between the motor and the mud pump; the male and female coupling docking structure simplifies the installation, disassembly and maintenance process; the overall compact design significantly reduces the equipment footprint and enables the motor to directly drive the mud pump, thereby improving the system transmission efficiency.
[0027] To enhance structural strength and ventilation performance, a reinforcing rib plate 2 is welded to the outer periphery of the rotor inner sleeve 18 to support the rotor core and improve heat dissipation; an oil injection hole is opened on the side of the middle part of the connecting plate 12 to facilitate lubrication and adjustment of the coupling angle; the left hole of the connecting plate 12 is larger than the diameter of the male coupling 10 of the mud pump to facilitate coupling insertion; if there is a gap between the left hole of the connecting plate and the outer buckle 9 of the bearing, a transition washer 11 can be set to achieve concentric positioning and improve assembly accuracy.
[0028] An oil injection pipe is installed in the inner hole of the fixed shaft 1, and the bearing is lubricated through the oil injection pipe; a sealed ring protective ring 7 is installed between the inner right side of the front cover 14 and the outer periphery of the female coupling 8 to achieve dustproof sealing of the internal coil of the motor.
[0029] The front cover 14 is fixedly connected to the right side of the mud pump by a screw and nut 13 to maintain the distance between the motor and the mud pump, support the motor body, and prevent the motor rotor 3 shaft from sagging due to its weight.
[0030] The motor rotor 3 is connected to the female coupling 8 by a screw connection on the side near the mud pump. When the female coupling is worn, it can be disassembled and replaced from the side. The diameter of the female coupling 8 is designed to be slightly smaller than the outer diameter of the rotor 3, so as to maintain a compact structure while meeting the transmission requirements. The female coupling 8 is screwed to the rotor inner sleeve 18 through the end face, which facilitates assembly and maintenance.
[0031] The male and female couplings 10 and 8 of the mud pump can adopt various flexible connection forms such as pin couplings, claw couplings, drum gear couplings, plum blossom type flexible couplings, sleeve couplings, cross couplings, and nylon sleeve gears to achieve pluggable connection in the horizontal direction and improve disassembly and assembly efficiency.
[0032] Since the fixed shaft 1 support structure is a single-sided bearing, it needs to withstand large radial and axial loads. It is preferable to use self-aligning cylindrical roller bearings or double row bearings with high load capacity to ensure stable operation. The shaft of the motor rotor 3 needs to have sufficient rigidity. The shaft section screwed to the rear end cover 19 is designed to be short and thick, and straightening treatment is carried out to prevent axial bending deformation. The motor rotor 3 must undergo precise dynamic balancing treatment. A tangential key is set between the female pair wheel 8 and the rotor inner sleeve 18, and it is fastened with high-strength screws to improve torque transmission capacity.
[0033] The internal coils 17 of the motor fill the internal space of the housing 15. To ensure a compact structure and excellent cooling capacity, an explosion-proof blower can be installed on the top of the motor housing 15 to blow air. The cooling air circulates inside the housing and is discharged from the bottom, thereby achieving stable heat dissipation under high load conditions.
[0034] Installation method: Use a hoist to lift the motor, place the motor base 4 on the support platform 6, and push the motor horizontally to the side of the mud pump so that the male coupling 10 is inserted into the connecting plate 12; check through the observation window whether there is a gap between the left hole of the connecting plate and the outer buckle 9 of the bearing. If there is a gap, insert the transition washer 11 for concentric positioning; continue to push the motor, and after observing that the male coupling 10 and the female coupling 8 of the mud pump are properly connected, use the screw nut 13 for horizontal fixation, and then use the screw for vertical fixation to complete the installation.
[0035] Structural Innovation Summary: This utility model significantly shortens the distance between the motor and the mud pump by extending the male coupling 10 of the mud pump horizontally into the motor and flexibly connecting it with the female coupling 8. It eliminates the traditional coupling structure on the motor side, simplifies the installation and maintenance process, reduces the footprint, and improves compactness and transmission efficiency. It has good engineering practicality and promotional value.
[0036] 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 for shortening the distance between the motor and the mud pump, comprising a motor base (4), a support platform (6), a connecting plate (12), a motor housing (15), and a male mud pump wheel (10), characterized in that: The motor base (4) is set on the support platform (6) welded on the right side of the mud pump body. The front end cover (14) and the rear end cover (19) are respectively set at the front and rear ends of the motor housing (15). The connecting plate (12) is set between the front end cover (14) and the mud pump. The motor housing (15) is equipped with a motor stator (16), stator core coil (17), motor rotor (3), fixed shaft (1) and female wheel (8). The mud pump male wheel (10) extends horizontally into the motor and is flexibly connected to the female wheel (8). The fixed shaft (1) is screwed to the inside of the rear end cover (19). The fixed shaft (1) is equipped with a bearing (5) on the side near the female wheel (8) and a bearing (20) on the other side. The inner side of the motor rotor (3) is equipped with a rotor inner sleeve (18). The motor rotor (3) is screwed to the female wheel (8) on the side near the mud pump.
2. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The left inner hole of the connecting plate (12) is concentrically positioned with the bearing outer buckle (9) of the mud pump, and the right side of the connecting plate (12) is concentric with the front cover (14) and is fixedly connected by screws.
3. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The inner hole on the left side of the connecting plate (12) is larger than the diameter of the male wheel (10) of the mud pump. A transition washer (11) is provided between the inner hole on the left side of the connecting plate (12) and the outer thread (9) of the bearing.
4. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The rotor inner sleeve (18) is welded with reinforcing ribs (2) on its outer periphery.
5. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The bearing 1 (5) on the fixed shaft (1) closer to the direction of the mud pump is a self-aligning cylindrical roller bearing, and the bearing 2 (20) away from the direction of the mud pump is a single-row cylindrical roller bearing.
6. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: A sealed protective ring (7) is provided between the inside of the right side of the front cover (14) and the outer periphery of the female wheel (8).
7. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The front cover (14) is fixed to the right side of the mud pump with a screw nut (13).
8. The motor structure for shortening the distance between the motor and the mud pump according to claim 1, characterized in that: The female coupling (8) and the male coupling (10) of the mud pump are flexibly connected by a claw coupling, a drum gear coupling, and a pin coupling.