Positive displacement pump structure with permanent magnet motor directly driving internal gear

Abstract

The utility model relates to the technical field of positive displacement pumps, in particular to a positive displacement pump structure with an inner gear directly driven by a permanent magnet motor, which comprises a positive displacement pump casing, and an inner cavity of the positive displacement pump casing is divided into a stator mounting area of an outer ring and a rotor mounting area of an inner ring through an annular partition plate. A motor stator is mounted in the stator mounting area, a plurality of stator teeth are uniformly distributed on the inner ring of the motor stator, and a coil winding is arranged on each stator tooth; a rotating shaft is rotationally arranged in the rotor mounting area, a motor rotor is mounted at the axial outer end of the rotating shaft, an outer gear ring is further arranged in the rotor mounting area, and the motor rotor can drive the outer gear ring to rotate. The product is reasonable and ingenious in structure, and the axial space of the motor is reduced; meanwhile, the permanent magnet motor is adopted to directly drive the gear pump head rotor, the torque density of the motor is high, meanwhile, assembly parts are reduced, the cost is reduced, and the assembly integration degree is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of positive displacement pumps, in particular to a positive displacement pump structure in which a permanent magnet motor directly drives an internal gear. Background Art

[0002] Traditional internal gear pumps are positive displacement pumps. Their power take-off units often utilize radial flux permanent magnet motors. Internal and external gears work together to achieve the system's cooling objectives by absorbing and discharging coolant. This structure often occupies a significant amount of axial space, and torque is transmitted through the shaft. Summary of the Invention

[0003] In response to the above-mentioned problems, the utility model provides a positive displacement pump structure in which a permanent magnet motor directly drives an internal gear. The axial space of the motor of the positive displacement pump structure is reduced. The permanent magnet motor is used to directly drive the gear pump head rotor, and the motor torque density is high. At the same time, the number of assembly parts is reduced, the cost is reduced, and the assembly integration is improved.

[0004] According to the technical solution of the utility model: a volumetric pump structure in which a permanent magnet motor directly drives an internal gear, characterized in that: it includes a volumetric pump housing, the inner cavity of the volumetric pump housing is divided into an outer ring stator installation area and an inner ring rotor installation area by an annular partition plate;

[0005] The stator installation area is provided with a motor stator, and a plurality of stator teeth are evenly distributed on the inner ring of the motor stator, and a coil winding is provided on each stator tooth;

[0006] The rotor mounting area is rotatably provided with a rotating shaft, and the motor rotor is installed at the axial outer end of the rotating shaft. The rotor mounting area is also provided with an external gear ring, and the motor rotor can drive the external gear ring to rotate. The salient pole structure of the motor stator and the salient pole structure of the motor rotor generate torque through the interaction between the permanent magnetic field and the armature magnetic field, thereby driving the motor rotor to rotate;

[0007] The axial outer open end of the displacement pump housing is sealed with an oil inlet and outlet end cover, and the oil inlet and outlet end cover is provided with an oil inlet hole and an oil return hole corresponding to the rotor installation area.

[0008] As a further improvement of the present invention, the motor rotor is provided with an odd number of rotor teeth, and the stator teeth of the motor stator are embedded in permanent magnets to form a stator permanent magnet motor.

[0009] As a further improvement of the present invention, the permanent magnet is in a strip shape, and the strip permanent magnet is embedded in the stator teeth of the motor stator along the radial direction.

[0010] As a further improvement of the present invention, the motor rotor is provided with an even number of rotor teeth, and permanent magnets are mounted on the rotor teeth of the motor rotor to form a rotor permanent magnet motor.

[0011] As a further improvement of the present invention, the permanent magnet is in a strip shape, and the strip-shaped permanent magnet is parallel to the top surface of the stator teeth of the motor stator.

[0012] The technical effects of the utility model are: the product structure of the utility model is reasonable and ingenious, and the axial space of the motor is reduced; at the same time, a permanent magnet motor is used to directly drive the gear pump head rotor, and the motor torque density is high. At the same time, the assembly parts are reduced, the cost is reduced, and the assembly integration is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure 2 This is a structural diagram of a stator permanent magnet motor.

[0015] Figure 3 This is a structural diagram of a rotor permanent magnet motor.

[0016] Figure 4 It is a radial cross-sectional view of the present invention. DETAILED DESCRIPTION

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the scope of protection of the present invention.

[0019] Figure 1-4 It includes oil inlet and outlet end covers 211, an outer gear ring 212, a motor rotor 213, a permanent magnet 214, a rotating shaft 215, a positive displacement pump housing 216, a motor stator 217, an annular partition plate 218, etc.

[0020] like Figure 1-4 As shown, the present invention is a volumetric pump structure in which a permanent magnet motor directly drives an internal gear, including a volumetric pump housing 216 , the inner cavity of which is divided into an outer stator mounting area and an inner rotor mounting area by an annular partition plate 218 .

[0021] The motor stator 217 is installed in the stator installation area. A plurality of stator teeth are evenly distributed on the inner ring of the motor stator 217, and a coil winding is respectively arranged on each of the stator teeth.

[0022] A rotating shaft 215 is rotatably provided in the rotor mounting area, and a motor rotor 213 is installed at the axial outer end of the rotating shaft 215. An outer gear ring 212 is also provided in the rotor mounting area, and the motor rotor 213 can drive the outer gear ring 212 to rotate. The salient pole structure of the motor stator 217 and the salient pole structure of the motor rotor 213 generate torque through the interaction between the permanent magnetic field and the armature magnetic field, thereby driving the motor rotor 213 to rotate.

[0023] The axially outer open end of the displacement pump housing 216 is sealed with an oil inlet and outlet cover 211 , and an oil inlet hole and an oil return hole are provided on the oil inlet and outlet cover 211 corresponding to the rotor installation area.

[0024] When the present invention is working, the rotating shaft 215 drives the motor rotor 213 to rotate. When the motor rotor 213 rotates, it drives the outer gear ring 212 to rotate in the displacement pump housing 216. The axial outer end of the outer gear ring 212 is axially limited by the oil inlet and outlet end cover 211.

[0025] like Figure 2 As shown, the motor rotor 213 is provided with an odd number of rotor teeth, and the stator teeth of the motor stator 217 are embedded in the permanent magnets 214 to form a stator permanent magnet motor.

[0026] The permanent magnets 214 are strip-shaped and radially embedded in the stator teeth of the motor stator 217. The operating principle of this permanent magnet motor is that the permanent magnetic field created by the permanent magnets 214 combines with the armature magnetic field created by the armature windings, modulating the salient-pole rotor to generate an induced electromotive force and electromagnetic torque. The rotor of this type of motor is composed solely of magnetically conductive material, lacking permanent magnets or windings. This results in a simple and reliable structure, high power density, good fault tolerance, and flexible control.

[0027] like Figure 3 As shown, the motor rotor 213 is provided with an even number of rotor teeth, and permanent magnets 214 are mounted on the rotor teeth of the motor rotor 213 to form a rotor permanent magnet motor.

[0028] The permanent magnet 214 is in a strip shape, and the strip-shaped permanent magnet 214 is parallel to the top surface of the stator teeth of the motor stator 217 .

[0029] The operating principle of this rotor permanent magnet motor is that the permanent magnets 214 create the motor's permanent magnetic field, while the stator armature windings create the motor's armature magnetic field. The interaction of these two magnetic fields generates torque. This type of motor has high power density, torque inertia, and efficiency.

[0030] like Figure 1-4As shown, the motor rotor 213 and the motor stator 217 in the present invention are both double-pole structures, and both use concentrated windings. Due to the different placement positions of the permanent magnets 214, they are divided into stator permanent magnet motors and rotor permanent magnet motors. It should be noted that in order to prevent the generation of eddy currents, the positive displacement pump housing 216 is made of non-magnetic material.

[0031] Compared to conventional internal gear positive displacement pump assemblies based on radial flux motors as power units, the present invention's shared assembly structure, which combines the power motor rotor with the internal gear components of the internal gear positive displacement pump, offers the following advantages: 1. The axial space surrounding the motor is reduced, contributing to a smaller system assembly volume. 2. The magnetic field directly transmits torque to the motor's gear rotor, leading to rotation, reducing rotor weight and enhancing product competitiveness.

[0032] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A positive displacement pump structure in which a permanent magnet motor directly drives an internal gear, characterized in that: It comprises a displacement pump housing (216), wherein the inner cavity of the displacement pump housing (216) is divided into an outer ring stator installation area and an inner ring rotor installation area by an annular partition plate (218); The stator installation area is provided with a motor stator (217), the inner ring of the motor stator (217) is provided with a plurality of stator teeth evenly distributed, and a coil winding is provided on each stator tooth; The rotor installation area is rotatably provided with a rotating shaft (215), and the motor rotor (213) is installed at the axial outer end of the rotating shaft (215). The rotor installation area is also provided with an outer gear ring (212), and the motor rotor (213) can drive the outer gear ring (212) to rotate. The salient pole structure of the motor stator (217) and the salient pole structure of the motor rotor (213) generate torque through the interaction of the permanent magnetic field and the armature magnetic field, thereby driving the motor rotor (213) to rotate. The axially outer open end of the displacement pump housing (216) is sealed with an oil inlet and outlet end cover (211), and the oil inlet and outlet end cover (211) is provided with an oil inlet hole and an oil return hole corresponding to the rotor installation area.

2. The positive displacement pump structure with a permanent magnet motor directly driving an internal gear according to claim 1, characterized in that: The motor rotor (213) is provided with an odd number of rotor teeth, and the stator teeth of the motor stator (217) are embedded in the permanent magnets (214), forming a stator permanent magnet motor.

3. The positive displacement pump structure with a permanent magnet motor directly driving an internal gear as claimed in claim 2, characterized in that: The permanent magnet (214) is in a strip shape, and the strip-shaped permanent magnet (214) is radially embedded on the stator teeth of the motor stator (217).

4. The positive displacement pump structure with a permanent magnet motor directly driving an internal gear according to claim 1, characterized in that: The motor rotor (213) is provided with an even number of rotor teeth, and permanent magnets (214) are mounted on the rotor teeth of the motor rotor (213), forming a rotor permanent magnet motor.

5. The positive displacement pump structure with a permanent magnet motor directly driving an internal gear as claimed in claim 4, characterized in that: The permanent magnet (214) is in a strip shape, and the strip-shaped permanent magnet (214) is parallel to the stator tooth top surface of the motor stator (217).

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