Low speed and high torque permanent magnet synchronous motor for plunger pump

Abstract

The present invention discloses a low-speed, high-torque permanent magnet synchronous motor for a plunger pump, comprising a housing assembly consisting of an annular housing and front and rear flanges, a stator assembly, a rotor assembly and a chain coupling; the bottom of the front flange is extended with a foot connected to a mounting base; the chain coupling comprises a first sleeve arranged on the inner side of the motor shaft through a key connection, the first sleeve extends to the outer side of the front flange and is provided with a first outer flange, a second sleeve for sleeved plunger pump shaft is nested in the first sleeve, a second outer flange opposite to the first outer flange is provided on the second sleeve, and the first outer flange and the second outer flange are fixed by a chain to transmit torque. The present invention has an ingenious structure, is safe and reliable, occupies a small area, is easy to install, has obvious energy-saving effect, is convenient for later maintenance, and is very suitable for the installation of a plunger pump driven by a low-speed, high-torque permanent magnet synchronous motor in a narrow space.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a low-speed, high-torque permanent magnet synchronous motor for a plunger pump. Background Art

[0002] At present, in the mechanical equipment of traditional industries (such as port lifting, metallurgical steel rolling, and oil extraction), the drive system composed of asynchronous motors and mechanical gear transmission, belt transmission and other reduction mechanisms still dominates. However, it has the disadvantages of complex structure, large volume, low overall system efficiency, high noise, large moment of inertia, and frequent maintenance, which is inconsistent with the theme of "green development" and "energy conservation and environmental protection" in my country.

[0003] The low-speed, high-torque permanent magnet synchronous motor is powered by a sine wave current, with a speed of no more than 500r / min and a torque of no less than 500N·m. It can be used in industrial fields such as oil fields, electric power, lifting, and metallurgy. It overcomes the unfavorable factors of output torque pulsation, and can obtain good speed regulation performance and mechanical characteristics with the controller, and the output torque is stable and the dynamic response speed is fast. Directly driving the load by a low-speed, high-torque motor is the inevitable development direction of energy-saving technology in the above fields. However, due to the complexity of the installation site and the small installation space, it is difficult to connect the motor and load equipment such as the plunger pump using the traditional installation method, which greatly hinders the promotion of low-speed, high-torque permanent magnet synchronous motors. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a low-speed, high-torque permanent magnet synchronous motor for a plunger pump that can be installed in a narrow space. Specifically, the following technical solutions can be adopted:

[0005] The low-speed, high-torque permanent magnet synchronous motor for a plunger pump of the present invention comprises:

[0006] The housing assembly comprises an annular housing, the opening ends of which are respectively connected to a front flange and a rear flange, and a foot connected to a mounting base is extended from the bottom of the front flange;

[0007] The stator assembly includes a stator winding and a stator core arranged on the inner side of the annular housing;

[0008] The rotor assembly comprises a motor shaft connected to the front and rear flanges through bearings, the motor shaft is a hollow structure, a spoke-shaped support frame is arranged on the outside of the motor shaft, and a rotor core and a rotor magnet are arranged on the periphery of the support frame;

[0009] The chain coupling includes a first sleeve arranged on the inner side of the motor shaft through a key connection, the first sleeve extends to the outside of the front flange and is provided with a first outer flange, a second sleeve for sleeved on the plunger pump shaft is nested in the first sleeve, and a second outer flange opposite to the first outer flange is provided on the second sleeve, and the first outer flange and the second outer flange are fixed by a chain to transmit torque.

[0010] The outer peripheral surface of the annular shell is provided with heat dissipation ribs.

[0011] The outer side of the front flange is provided with triangular oblique ribs extending toward the base, and the inner sides of the front flange and the rear flange are both provided with bearing chamber reinforcing ribs.

[0012] The rear flange is provided with a cover plate and a junction box, and a through hole for allowing a disc pump tool to pass through is opened at the center of the cover plate.

[0013] The rear flange is provided with a sealing plate corresponding to the position of the through hole.

[0014] The first sleeve and the second sleeve are provided with dust covers which are connected to the first outer flange, the second outer flange and the outer side of the chain.

[0015] The stator winding and the rotor core are of a multi-pole fractional slot structure.

[0016] The low-speed, high-torque permanent magnet synchronous motor for the plunger pump provided by the present invention adopts a T-shaped front flange, which has both the rotor support and foot installation functions; at the same time, a chain coupling with a small axial space is used for torque transmission, shortening the axial installation distance required for the motor. The present invention has an ingenious structure, is safe and reliable, occupies a small area, is easy to install, has obvious energy-saving effects, and is convenient for later maintenance. It is very suitable for the installation of a plunger pump driven by a low-speed, high-torque permanent magnet synchronous motor in a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0018] The following is a detailed description of an embodiment of the present invention in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention and provides a detailed implementation method, but the protection scope of the present invention is not limited to the following embodiment.

[0019] like Figure 1 As shown, the low-speed, high-torque permanent magnet synchronous motor for the plunger pump of the present invention is composed of a housing assembly, a stator assembly, a rotor assembly, a specially designed chain coupling, and the like.

[0020] Specifically, the housing assembly includes an annular housing 1.1, on the outer circumference of which heat dissipation ribs a are welded, which not only play a heat dissipation role, but also can strengthen the housing strength; the open ends of the annular housing 1.1 are respectively connected to the front flange 1.2 and the rear flange 1.3, and the centers of the front flange 1.2 and the rear flange 1.3 are provided with bearing chambers and bearing chamber reinforcement ribs; in order to simplify the structure and reduce the installation volume, the bottom of the front flange 1.2 is horizontally extended with a foot 1.4 connected to the installation base M, so that the overall cross-section of the front flange 1.2 is a T-shaped structure, which has both rotor support and overall support functions. In order to enhance the support performance, the outer side of the front flange 1.2 is provided with a triangular oblique rib 1.5 extending toward the foot 1.4. In order to facilitate the disc pump, a through hole for the disc pump tool (such as a sleeve, etc.) to pass through is opened at the center of the cover plate 1.6 on the outer side of the rear flange 1.3, and a sealing plate corresponding to the position of the through hole is installed on the cover plate 1.6; in addition, a junction box 1.7 is installed on the rear flange 1.3. The stator assembly includes a stator winding 2.1 and a stator core 2.2 mounted on the inner side of the annular housing 1.1. The rotor assembly includes a motor shaft 3.1 connected to the front flange 1.2 and the rear flange 1.3 through a bearing. The motor shaft 3.1 is a hollow structure, and a spoke-shaped support frame 3.2 is integrally arranged on the outer side thereof. The rotor core 3.3 and the rotor magnet 3.4 are mounted on the periphery of the support frame 3.2. The stator winding 2.1 and the rotor core 3.3 adopt a multi-pole fractional slot structure, which fully reduces the tooth slot torque pulsation, reduces vibration, reduces noise, and ensures that the motor can run at a low speed within the frequency range of the conventional controller.

[0021] In order to facilitate the installation of the motor and the plunger pump, and to eliminate the influence of the axial movement of the plunger pump shaft extension and the coaxiality error between the two shafts on the equipment to the greatest extent, a chain coupling that can effectively compress the axial installation space is set between the motor and the plunger pump. The above-mentioned coupling adopts a special design, and its left and right parts are interlaced. Specifically, it includes a first sleeve 4.1 set on the inner side of the motor shaft 3.1 through a key connection, the first sleeve 4.1 extends to the outside of the front flange 1.2 and is provided with a first outer flange 4.2, the first sleeve 4.1 is nested with a second sleeve 4.3 for sleeve-connecting the N axis of the plunger pump, and the second sleeve 4.3 is provided with a second outer flange 4.4 opposite to the first outer flange 4.2, and the first outer flange 4.2 and the second outer flange 4.4 are fixed by a chain 4.5 to transmit torque. Furthermore, a dust cover 4.6 is mounted on the first sleeve 4.1 and the second sleeve 4.3, and covers the outside of the first outer flange 4.2, the second outer flange 4.4 and the chain 4.5.

[0022] The present invention is a low-speed, high-torque permanent magnet synchronous motor for a plunger pump that can be easily installed. The motor eliminates the reduction transmission mechanism, improves the overall efficiency of the system, and reduces the labor intensity of workers, eliminating tasks such as regular belt maintenance and regular belt replacement. Secondly, it effectively reduces the vibration wear, loosening and deformation of parts caused by the high-speed rotation of the original asynchronous motor.

[0023] In the description of the present invention, it should be noted that the terms "front", "rear", "inside", "outside", "horizontal", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A low-speed, high-torque permanent magnet synchronous motor for a plunger pump, characterized in that: include The housing assembly comprises an annular housing, the opening ends of which are respectively connected to the front flange and the rear flange, and the bottom of the front flange is horizontally provided with a foot connected to the mounting base, so that the overall cross-section of the front flange is a T-shaped structure; The stator assembly includes a stator winding and a stator core arranged on the inner side of the annular housing; The rotor assembly comprises a motor shaft connected to the front and rear flanges through bearings, the motor shaft is a hollow structure, a spoke-shaped support frame is arranged on the outside of the motor shaft, and a rotor core and a rotor magnet are arranged on the periphery of the support frame; The chain coupling includes a first sleeve arranged on the inner side of the motor shaft through a key connection, the first sleeve extends to the outside of the front flange and is provided with a first outer flange, a second sleeve for sleeved on the plunger pump shaft is nested in the first sleeve, and a second outer flange opposite to the first outer flange is provided on the second sleeve, and the first outer flange and the second outer flange are fixed by a chain to transmit torque.

2. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 1, characterized in that: The outer peripheral surface of the annular shell is provided with heat dissipation ribs.

3. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 1, characterized in that: The outer side of the front flange is provided with triangular oblique ribs extending toward the base, and the inner sides of the front flange and the rear flange are both provided with bearing chamber reinforcing ribs.

4. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 1, characterized in that: The rear flange is provided with a cover plate and a junction box, and a through hole for allowing a disc pump tool to pass through is opened at the center of the cover plate.

5. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 4, characterized in that: The rear flange is provided with a sealing plate corresponding to the position of the through hole.

6. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 1, characterized in that: The first sleeve and the second sleeve are provided with dust covers which are connected to the first outer flange, the second outer flange and the outer side of the chain.

7. The low-speed, high-torque permanent magnet synchronous motor for a plunger pump according to claim 1, characterized in that: The stator winding and the rotor core are of a multi-pole fractional slot structure.

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