A pump-integrated shielded electric drive internal gear pump

Abstract

The application discloses a kind of machine pump integrated shield electric drive internal meshing gear pump, including motor part, motor stator, inner gear ring, outer gear, shaft, front cover, back cover, the inner gear ring, outer gear and shaft are assembled in motor part inside, motor stator is equipped in the outer portion of inner gear ring, permanent magnet is inlaid in the inner gear ring, it is integrated into one in function to inner gear ring and motor rotor, inlaid permanent magnet inner gear ring, it is gear pump operating component, it is also motor rotor, motor stator generates alternating magnetic field, inner gear ring rotates under magnetic field force drive, inner gear ring promotes outer gear, to realize the delivery of lubricating medium.The application adopts machine pump integrated structure, need not coupling transmission torque, inlaid permanent magnet inner gear ring is directly rotated under magnetic field force driving force;Without coupling frame connection, use occasion also need not special rack, side in side, pump import and export both sides are provided with coupling flange, import and export flange coaxial line, can be directly installed on pipeline.

Description

Technical Field

[0001] This invention belongs to the technical field of internal gear pumps for conveying lubricating media, specifically a shielded electric-driven internal gear pump with integrated pump and motor. Background Technology

[0002] Currently, internal gear pumps employ a linear conjugate structure, with both the external gear and the internal gear ring featuring linear conjugate tooth profiles. An axial dovetail groove is opened on the outer side of the internal gear ring to house permanent magnets. Interference-fit bushings are used on both sides of the internal gear ring to prevent axial movement of the permanent magnets and to form a sliding bearing structure with the front and rear covers. The internal gear ring, inlaid with permanent magnets, serves as both the working component of the gear pump and the rotor of the motor. The motor stator uses a shielding sleeve structure to physically isolate the motor stator from the pump's internal components. When the motor is energized, the internal gear ring with embedded permanent magnets rotates, driving the external gear to jointly complete the liquid transport process.

[0003] Existing electric motor-driven internal gear pumps typically consist of a motor, coupling, internal gear pump, connecting frame, base, and related accessories. The motor and internal gear pump are mounted on the connecting frame, which is then mounted as a whole on the base. The motor delivers torque, driving the internal gear pump through the coupling to transport the lubricating medium. To simplify the design and reduce size, a cantilever structure is often used on one side of the internal gear pump. However, in existing electric motor-driven internal gear pumps, the motor drives the pump via a coupling, resulting in numerous connection points, making it difficult to shorten the length. Installation requires a connecting frame, base, and related accessories. Furthermore, the pump tooth profile is a non-straight tooth conjugate curve combination, leading to significant oil trapping, high flow pulsation rate, and high vibration and noise. The lack of a shielding sleeve structure also fails to prevent media leakage.

[0004] Among existing related patent technologies, such as the gear pump and internal meshing gear pump with built-in permanent magnet motor winding disclosed in patent (CN223120154U), the structure is compact through "built-in motor". However, the following technical problems still exist in terms of thermal management, sealing reliability, structural strength, and maintainability: The permanent magnet motor winding is built into the gear mounting slot, and the heat generated by the winding needs to be dissipated through multiple layers of conduction from the gear body to the oil to the pump body. This results in high thermal resistance and low efficiency. Long-term high-temperature operation may lead to the decay of the magnetic properties of the permanent magnet, affecting the stability of the output torque; the patent does not mention heat dissipation channels, heat-conducting materials, or cooling structures, resulting in insufficient thermal management capabilities under high load conditions; the patent does not include an electromagnetic shield. The shielding sleeve allows oil to directly contact the windings, posing a risk of insulation breakdown. The installation slots inside the gears to accommodate the motor assembly reduce the effective load-bearing cross-section, making the gear root prone to fracture or plastic deformation under high torque conditions. The patent only describes "the permanent magnet being tightly attached to the inner wall of the installation slot," without specifying the bonding / mechanical fixing process, which carries a risk of detachment under high-speed rotation and oil impact. The built-in motor assembly alters the gear's mass distribution, requiring high-precision dynamic balancing; otherwise, it can easily cause vibration and noise. The alternating magnetic field between the permanent magnet and the stator windings may induce eddy currents in the pump body's metal components, generating additional losses and heat. The built-in structure requires extremely high uniformity in the stator-rotor air gap; machining / assembly errors can easily lead to torque pulsation.

[0005] Therefore, there is an urgent need to adopt an internal gear pump structure with integrated motor and pump shielded electric drive. The motor stator is equipped with a shielding sleeve, and the motor rotor and pump internal gear ring are functionally integrated. Both the inlet and outlet sides of the pump are equipped with connecting flanges, so that the whole pump can be directly installed on the pipeline without the need for a special stand. Summary of the Invention

[0006] This invention proposes an integrated shielded electric drive internal gear pump, employing a unified pump-motor structure with a shielded motor stator. The internal gear ring, inlaid with permanent magnets, serves as both the pump's working component and the motor rotor, functionally combining the two. The motor stator generates an alternating magnetic field, driving the internal gear ring to rotate and in turn driving the external gear to rotate in the same direction, thus conveying the lubricating medium from the pump inlet to the pump outlet.

[0007] The main rotating parts of this invention are an internal gear ring and an external gear. With fewer rotating parts, the pump tooth profile is a combination of straight tooth conjugate curves, resulting in less oil trapping, lower flow pulsation rate, and less vibration and noise. This invention proposes to perform circular arc smooth fitting on the tooth profile (straight tooth conjugate curve) of the internal gear ring, which simplifies the processing technology and testing methods, resulting in high tooth profile accuracy, good smoothness, and high surface finish.

[0008] This invention eliminates the need for couplings, connecting frames, bases, mechanical seals, rolling bearings, and other components. The motor stator shielding sleeve and related O-rings achieve physical isolation between the conveyed medium and the external environment, resulting in zero leakage. This invention reverses the direction of the alternating magnetic field in the motor stator by changing the current phase, thereby altering the rotation direction of the internal gear ring and external gear, and achieving pump inlet / outlet reversal.

[0009] The pump of this invention has inlet and outlet sides, and connecting flanges are provided on both sides of the inlet and outlet. The flanges are coaxial, and the whole pump does not require a special stand and can be directly installed on the pipeline, which meets the layout requirements of strict space requirements and quick replacement and maintenance.

[0010] This invention has high market economic value. It is an internal gear pump with a wide performance range, low vibration and noise, small size, light weight, low installation requirements, and simple maintenance, making it well-suited for modular design.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is: an integrated shielded electric drive internal gear pump, comprising a motor part, a motor stator, an internal gear ring, an external gear, a shaft, a front cover, and a rear cover. The internal gear ring, external gear, and shaft are fitted inside the motor part. The motor stator is provided outside the internal gear ring. A permanent magnet is embedded in the internal gear ring, which functionally integrates the internal gear ring and the motor rotor. The internal gear ring with the embedded permanent magnet is both a working component of the gear pump and a motor rotor. The motor stator generates an alternating magnetic field, and the internal gear ring rotates under the drive of the magnetic field force. The internal gear ring pushes the external gear, thereby realizing the delivery of the lubricating medium.

[0012] Furthermore, a dovetail groove is opened on the outer side of the internal gear ring along the axial direction, and a permanent magnet is installed in the dovetail groove. The dovetail groove has a certain V-shaped inclination to prevent the permanent magnet from being thrown out under the action of centrifugal force. When the permanent magnet is installed into the internal gear ring, sealant is applied to prevent axial movement.

[0013] Furthermore, the inner gear ring is fitted with bushings with a certain interference fit on both sides to prevent the permanent magnet from moving axially, and forms a sliding bearing structure with the mating holes of the front cover and the rear cover, which is lubricated and cooled by the conveyed lubricating medium.

[0014] Furthermore, the motor stator is equipped with a stator shielding sleeve to physically isolate the motor stator from the internal gear ring. All connecting surfaces of the stator shielding sleeve are sealed with O-rings for static connection, completely cutting off the medium leakage channel, and ensuring that there is no leakage when the medium enters, exits, or is transported.

[0015] Furthermore, there is a certain gap between the inner gear ring of the embedded permanent magnet and the stator shielding sleeve to avoid contact and friction.

[0016] Furthermore, the external gear is a straight line, and the internal gear ring is a straight conjugate tooth profile curve. The straight conjugate tooth profile curve is composed of discrete points, or is composed of multiple circular arcs smoothly fitted after error control.

[0017] Furthermore, the internal gear ring and external gear adopt a helical tooth structure to increase the overlap ratio and reduce meshing impact, and the axial inclination angle of the helical teeth is limited to not connecting the pump inlet and outlet.

[0018] Furthermore, the flow direction at the pump inlet and outlet changes with the rotation direction of the internal gear ring and the external gear. By changing the current phase, the direction of the alternating magnetic field of the motor stator is reversed, and the rotation direction of the internal gear ring with embedded permanent magnets is reversed, thus realizing the reversal of the pump inlet and outlet.

[0019] Furthermore, connecting flanges are installed on both the inlet and outlet sides of the pump, and the inlet and outlet flanges are coaxial, without connecting frame or base structure.

[0020] Furthermore, the entire pump is installed directly on the pipeline, acting as a transfer pump within the pipeline.

[0021] Compared with the prior art, the present invention has the following significant advantages:

[0022] 1. The pump and motor are integrated into one structure, eliminating the need for a coupling to transmit torque. The internal gear ring with embedded permanent magnets rotates directly under the driving force of the magnetic field.

[0023] 2. The pump and motor are integrated into one unit, eliminating the need for a connecting frame and a special platform for use. It features side inlet and side outlet, with connecting flanges on both the inlet and outlet sides of the pump. The inlet and outlet flanges are coaxial and can be directly installed on the pipeline.

[0024] 3. The integrated pump and motor structure, employing a shielded sleeve design, prevents media leakage, achieving zero-leakage delivery. This significantly improves the safety of media transportation. The integrated pump and motor structure also allows heat from the motor to be carried away by the transported medium, eliminating the need for fan cooling. Furthermore, the spur gear conjugate structure offers advantages such as less oil trapping, lower flow pulsation rate, no mechanical seals, no bearings, fewer moving parts, and high reliability.

[0025] 4. This invention smoothly fits the straight conjugate curve g2 of the internal gear ring into multiple circular arcs, and uses a circular arc meshing method to process the internal gear ring profile. This not only reduces the processing difficulty, but also makes the internal gear ring profile more accurate, smoother, and more surface-finished, greatly simplifying the processing and inspection methods. This is beneficial to improving processing efficiency.

[0026] 5. The inlet and outlet flow directions of the pump in this invention change with the rotation direction of the internal gear ring and external gear. By changing the current phase, the rotation direction of the internal gear ring and external gear can be changed, thereby achieving the reversal of the pump inlet and outlet. This is ideal for the rapid displacement of media within pipelines and greatly facilitates the system's rapid control over media flow.

[0027] 6. The present invention has a simple structure, few parts, and light weight; it has low vibration and noise, and is suitable for low-noise and low-vibration conveying of lubricating media.

[0028] 7. The overall structure of this invention has a small size, making it easy to disassemble and maintain; it operates smoothly with very low vibration and noise, making it suitable for environments with strict space restrictions and strict requirements for disassembly and maintenance. Attached Figure Description

[0029] Figure 1 This is a schematic cross-sectional view of the integrated pump and motor shielded electric drive internal gear pump of the present invention. Figure 2 for Figure 1 A sectional view of AA in the diagram; Figure 3 This is an exploded schematic diagram of the main components of the integrated pump and motor shielded electric drive internal gear pump of the present invention; Figure 4 This is a schematic diagram illustrating the meshing principle of the external gear with a straight line g1 and the internal gear ring with a straight line conjugate curve g2. Figure 5 This is an enlarged schematic diagram of the external gear tooth profile g1 and the internal gear ring tooth profile g2.

[0030] Figure 6 This is a schematic diagram of the smooth fitting of the straight line conjugate curve circular arc of the internal gear tooth profile. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] like Figures 1 to 3 As shown, the integrated motor-pump shielded electric drive internal gear pump of the present invention includes a motor part 1, a front cover 2, a crescent plate cover 3, an internal gear ring 4, an external gear 5, a shaft 6, a cover 7, a rear cover 8, etc.

[0033] Figure 1 In the middle, the motor part 1, the front cover 2, and the rear cover 8 form an integral shell. The motor part 1 and the front cover 2, and the motor part 1 and the rear cover 8 are sealed and connected by O-ring 21, front cover fastening screw 22, and rear cover fastening screw 81.

[0034] Figure 1 In the gear ring 4, a dovetail groove is cut along the axial direction on the outer side to install the permanent magnet 42. The dovetail groove has a certain V-shaped inclination to prevent the permanent magnet 42 from being thrown out by the centrifugal force when the gear ring 4 rotates. When the permanent magnet 42 is installed in the gear ring 4, a suitable sealant can be applied to prevent axial movement. The gear ring 4 has a certain interference fit bushing 41 on both sides, which can not only prevent the permanent magnet 42 from moving axially, but also form a sliding bearing structure with the mating holes of the front cover 2 and the rear cover 8. The gear ring 4, which is inlaid with the permanent magnet 42, is both a working part of the gear pump and a motor rotor.

[0035] Figure 1In the motor section 1, the internal gear ring 4, external gear 5, and shaft 6 are fitted inside. Crescent-shaped pressure plates 3 and 7 limit the movement of the internal gear ring 4, external gear 5, and shaft 6 from both sides of the motor section 1. Shaft 6 is a stepped shaft, with its extension passing through the holes in the crescent-shaped pressure plates 3 and 7. A stepped shoulder on the shaft prevents axial movement of shaft 6. The crescent-shaped pressure plates 3 and 7 are positioned with stop edges on the front cover 2 and rear cover 8, respectively, and are then fastened together with pressure plate screws 31. The motor section 1 has a motor junction box 11 for external cable connection.

[0036] To facilitate reading the diagrams and to gain a more detailed understanding of the internal structure, Figure 2 The middle AA view is along Figure 1 A cross-sectional view cut open in the middle of the pump shows the internal structure of the gear pump and the meshing process.

[0037] Figure 2 In this design, the motor section 1 includes a motor housing 12, a stator core 13, stator coils 14, and a stator shielding sleeve 15. The middle portion of the stator shielding sleeve is approximately 0.3~1.0mm thick. The stator core 13 is made of stacked silicon steel sheets, and the stator coils are copper coils impregnated with insulating varnish, passing through the stator core 13 according to a specific pattern. When alternating current is applied to the stator coils 14, an alternating magnetic field is generated inside the motor section 1. The stator shielding sleeve 15 is a thin-walled component, welded to the front cover 2 and the rear cover 8, thus physically isolating the pump's interior from the external environment. The stator shielding sleeve 15 is made of non-magnetic metal, and its thickness is appropriately controlled to avoid increasing eddy currents when the magnetic field passes through, thereby increasing copper losses and heat loss. The material of the stator shielding sleeve 15 can be austenitic stainless steel (304L, 316L, 904L and other low carbon stainless steel), Hastelloy (C-276, C-22, B-3) or Inconel (625, 600 grade), or titanium and titanium alloys, copper-based alloys (C7521, C7701), etc.

[0038] Figure 2 In the gear pump, the internal gear ring 4 and the stator shielding sleeve 15 maintain a gap of approximately 1mm to avoid contact and friction. The two side bushings 41 of the internal gear ring 4 respectively engage with the holes in the front cover 2 and the rear cover 8, forming a structure similar to a sliding bearing. The internal gear ring 4, with its embedded permanent magnet 42, serves as both a working component of the gear pump and a motor rotor. Under the influence of the alternating magnetic field inside the motor section 1, it rotates according to... Figure 2 The rotation direction shown is counterclockwise, driving the external gear 5 to rotate in the same direction. Because the internal gear ring 4 and the external gear 5 generate negative pressure in the pump suction chamber 43, the pump inlet on the front cover 2 is located here, drawing in the lubricating medium from the pump inlet. The crescent plate 32 on the crescent plate cover 3 separates the pump suction chamber 43 and the pump discharge chamber 44. The internal gear ring 4 and the external gear 5 re-mesh in the pump discharge chamber 43, squeezing the lubricating medium into the pump discharge chamber 44 under positive pressure. If the rotation direction of the internal gear ring 4 is counterclockwise... Figure 2 Conversely, if the rotation is clockwise, the pump inlet and pump outlet will be swapped accordingly, meaning the pump inlet and pump outlet will become the pump outlet and pump inlet.

[0039] Figure 2 In this example, the slot ratio of stator core 13 to permanent magnet 42 is 40:38, which is only an example. It has been verified in practice that any design with a good slot ratio can be applied.

[0040] Figure 3 The image shows an explosion of the main components of the integrated pump-machine shielded electric drive internal gear pump of the present invention, intended to facilitate understanding of the assembly relationship and relative position of the internal parts of the pump.

[0041] Figure 3 In the internal gear ring 4, the permanent magnet 42 can be a neodymium iron boron magnet (NdFeB) or a neodymium cobalt magnet (SmCo), or a ferrite magnet. The external gear 5 and the shaft 6 should be made of non-magnetic materials, such as austenitic stainless steel (304L, 316L, 904L and other low-carbon stainless steels), titanium and titanium alloys, copper-based alloys (C7521, C7701), etc.

[0042] Figure 3 The permanent magnet 42 is a trapezoidal structure that matches the shape and size of the dovetail groove of the inner gear ring 4, and is embedded in the dovetail groove of the inner gear ring 4. From the overall structure, the permanent magnet 42 is arranged in a tangential layout in the inner gear ring 4. Its magnetization direction is tangential to the inner gear ring 4 and perpendicular to the radial direction. Adjacent magnets have opposite polarities, forming a "magnetic flux focusing" effect, resulting in high air gap magnetic flux density, large torque and power density, and good mechanical strength.

[0043] like Figure 4 and Figure 5 As shown, in a linear conjugate internal gear pump, the meshing tooth profiles conform to the basic principle of tooth profile meshing: the common normal of the conjugate tooth profiles at the contact point must pass through the instantaneous meshing node. The instantaneous meshing node of the straight line g1 and the linear conjugate curve g2 is the tangent point of the two pitch circles, namely, the tangent point P of the external gear pitch circle r1 and the internal gear ring pitch circle r2.

[0044] Figure 4 In the figure, the coordinate system of external gear (X1O1Y1) and the coordinate system of internal gear (X2O2Y2) are set. The vertical axes Y1 and Y2 are collinear, and the horizontal axes X1 and X2 are parallel, with a distance e between them, which is the center distance e between external gear (5) and internal gear (4).

[0045] Figure 4 In the equation, C1(x1,y1) is any point on the straight line g1 of the external gear, and C2(x2,y2) is any point on the conjugate curve g2 of the straight line of the internal gear ring.

[0046] Figure 4In the diagram, the straight line g1 of the external gear intersects the longitudinal axis Y1 at point A, with an included angle β. The line connecting the intersection of straight line g1 and pitch circle r1 with circle O1 forms the central angle θ with the longitudinal axis Y1.

[0047] Figure 4 In the equation of the straight tooth profile g1 of the external gear, y1=k The slope is represented by x1+b, where the slope is k=cotβ and the intercept is b=O1A=r1. cosθ+r1 sinθ cotβ.

[0048] Figure 4 In the equation, any point C2(x2,y2) on the straight conjugate curve g2 of the internal gear ring can be transformed to obtain the following formula: x2=x1 cos(φ1-i 12 φ1)-y1 sin(φ1-i 12 φ1) + e sin(i) 12 φ1); y2=x1 sin(φ1-i 12 φ1)+y1 cos(φ1-i 12 φ1) + e cos(i) 12 φ1).

[0049] Where i 12 For the reduction ratio, i 12 =r1 / r2. The rotation angle φ1 of line g1 is β-arccos((y1) / r2). cosβ+x1 sinβ) / r1).

[0050] Figure 5 In the equation, the straight line g1 and the conjugate curve g2 are derived from... Figure 4 The above formula is programmed and then drawn. The straight line g1 is simple and intuitive, and is relatively easy to use when machining the external gear tooth profile 51. However, the conjugate curve g2 is composed of a series of discrete points and is a slightly convex curve in shape. When machining the internal gear tooth profile 45, CNC machine tools or wire cutting methods are usually used, and the specific coordinate points are transmitted before machining.

[0051] It should be noted here that... Figure 5The tooth profile 45 of the internal gear ring is composed of a straight conjugate curve g2 formed by discrete data points. Although interpolation or increasing the number of discrete points can be used to improve machining accuracy when machining on CNC machine tools and wire cutting, the machining accuracy of this method is still difficult to achieve the surface finish that can be achieved by grinding or precision machining, and there is no good way to inspect the machining error.

[0052] Figure 6 In the process, the tooth profile 46 of the internal gear ring is generated using a circular arc smoothing fitting method. Specifically, a series of discrete points on the conjugate curve g2 of the straight line are smoothly fitted into multiple circular arcs. The distance from the discrete points to the center of the arc can be controlled by setting an error. For example... Figure 6 In the middle, g2 is smoothly fitted into three circular arcs, the radii of which are r respectively. 10 r 11 r 12 Their centers are O 10 O 11 O 12 Adjacent arcs have the same tangent direction at the connection point. Mathematically, this belongs to the first-order smoothness of the curve, which means that the curve is continuous and has a continuous first derivative. This allows the internal gear ring profile 46 to be processed with only limited coordinate data input. Moreover, it can be processed by grinding, resulting in high accuracy, good smoothness, and high surface finish of the internal gear ring profile. The processing and inspection methods can be greatly simplified.

[0053] In summary, the present invention proposes an integrated pump-machine shielded electric drive internal gear pump, which has the following main structural features: Firstly, the pump and motor are integrated into a single structure. The internal gear ring, inlaid with permanent magnets, serves as both the working component of the gear pump and the motor rotor. Functionally, the internal gear ring and the motor rotor are combined into one. The motor stator generates an alternating magnetic field, which drives the internal gear ring to rotate. The internal gear ring then pushes the external gear, thereby achieving the delivery of the lubricating medium. This structure eliminates the need for a coupling drive mechanism and significantly reduces the number of parts compared to conventional structures. Since the internal gear ring is also the motor rotor, the magnetic field directly drives its rotation, eliminating the intermediate torque transmission process and reducing energy loss during transmission. The overall structure is simple and compact, greatly improving overall efficiency. Secondly, the pump-machine integrated structure features connecting flanges on both the pump inlet and outlet sides, allowing the entire pump to be directly mounted on the pipeline, effectively treating it as part of the piping system. As long as the piping design appropriately incorporates additional supports before and after the pump, ensuring the pump unit's installation doesn't negatively impact pipeline connections or rigidity deformation, the pump-machine integrated structure eliminates connecting frames and bases, significantly reducing pump weight and overall dimensions compared to conventional structures. In confined spaces with stringent environmental requirements, the pump-machine integrated structure offers immense convenience for system layout and rapid installation.

[0054] Third, the motor stator of the integrated pump and motor structure uses a shielding sleeve, and all connection surfaces are sealed with O-rings for static connection, completely isolating the medium leakage channel. There is no need to worry about leakage during the medium entry, exit and transportation process, thus achieving zero leakage and greatly improving the safety of medium transportation.

[0055] Fourth, the integrated pump-motor structure allows the heat from the motor to be carried away by the medium itself, eliminating the need for fan cooling. Furthermore, the gear pump employs a spur gear conjugate structure, which offers advantages such as less oil trapping and lower flow pulsation, resulting in lower vibration and noise levels among internal gear pumps. The integrated pump-motor structure's rotating components consist only of an internal gear ring and an external gear, even eliminating the need for mechanical seals and rolling bearings. To further reduce vibration and noise, the internal gear ring and external gear can be designed with helical gears, increasing their overall overlap and reducing meshing impact, thus further enhancing vibration and noise reduction. Therefore, this invention theoretically possesses an inherent advantage in terms of vibration and noise levels.

[0056] Fifth, the flow direction at the pump inlet and outlet changes with the rotation direction of the internal gear ring and external gear. Changing the current phase reverses the direction of the alternating magnetic field in the motor stator, and the rotation direction of the internal gear ring, which contains permanent magnets, also reverses, causing a change in the pressure environment at the pump inlet and outlet. This alters the suction and discharge functions, achieving the reversal of the pump inlet and outlet. Thanks to the structural symmetry of the linear conjugate internal gear pump, it is ideally suited for the rapid movement of media within pipelines, facilitating rapid control of media flow within the system.

[0057] This invention is suitable for low-noise transport of lubricating media; it features a universal design with fewer parts, smooth operation, and minimal vibration and noise; the media transported within the pump also serves as a liquid cooling system, thus simplifying the structure and reducing vibration and noise; the integrated pump-machine structure significantly reduces the pump unit's weight and size, greatly facilitating its placement in confined spaces and enabling rapid replacement; changing the current phase allows for inlet and outlet reversal, enabling rapid media transfer within the pipeline, which is highly beneficial for rapid control of media flow within the system. This invention is ideally suited for use in environments with limited space, requiring low-noise transport of lubricating media, rapid maintenance and replacement, and stringent requirements for size and weight, and possesses significant market economic value.

[0058] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the concept and scope of the present invention. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A shielded electric drive internal gear pump integrating a motor and pump, comprising a motor part, a motor stator, an internal gear ring, an external gear, a shaft, a front cover, and a rear cover, wherein the internal gear ring, external gear, and shaft are fitted inside the motor part, and the motor stator is provided outside the internal gear ring, characterized in that: The internal gear ring is inlaid with a permanent magnet, which integrates the internal gear ring and the motor rotor in terms of function. The internal gear ring with the permanent magnet is both a working part of the gear pump and a motor rotor. The motor stator generates an alternating magnetic field, and the internal gear ring rotates under the drive of the magnetic field force. The internal gear ring drives the external gear, thereby realizing the delivery of the lubricating medium.

2. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: The inner gear ring has a dovetail groove on its outer side along the axial direction. A permanent magnet is installed in the dovetail groove. The dovetail groove has a certain V-shaped inclination to prevent the permanent magnet from being thrown out under centrifugal force. When the permanent magnet is installed into the inner gear ring, sealant is applied to prevent axial movement.

3. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: The internal gear ring is fitted with bushings on both sides with a certain interference fit to prevent the permanent magnet from moving axially. It also forms a sliding bearing structure with the mating holes of the front cover and the rear cover, and is lubricated and cooled by the conveyed lubricating medium.

4. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: The motor stator is equipped with a stator shielding sleeve to physically isolate the motor stator from the internal gear ring. All connecting surfaces of the stator shielding sleeve are sealed with O-rings for static connection, completely cutting off the medium leakage channel, and ensuring that there is no leakage when the medium enters, exits, or is transported.

5. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: There is a certain gap between the inner gear ring with embedded permanent magnet and the stator shielding sleeve to avoid contact and friction.

6. The integrated motor-pump shielded electric drive internal gear pump according to claim 1, characterized in that: The external gear is a straight line, and the internal gear ring is a straight conjugate tooth profile curve. The straight conjugate tooth profile curve is composed of discrete points, or is composed of multiple circular arcs that are smoothly fitted after error control.

7. The integrated shielded electric drive internal gear pump according to claim 1, characterized in that: The internal gear ring and external gear adopt a helical tooth structure to increase the overlap ratio and reduce meshing impact, and the axial inclination angle of the helical teeth is limited to not connecting the pump inlet and outlet.

8. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: The flow direction at the pump inlet and outlet changes with the rotation direction of the internal gear ring and the external gear. By changing the current phase, the direction of the alternating magnetic field of the motor stator is reversed, and the rotation direction of the internal gear ring with embedded permanent magnets is reversed, thus realizing the reversal of the pump inlet and outlet.

9. The integrated pump and motor shielded electric drive internal gear pump according to claim 1, characterized in that: The pump has connecting flanges on both the inlet and outlet sides. The inlet and outlet flanges are coaxial and there is no connecting frame or base structure.

10. The integrated pump and motor shielded electric drive internal gear pump according to claim 9, characterized in that: The entire pump is installed directly on the pipeline, acting as a transfer pump on the pipeline.

Images