A dual-rotor compound motor pump

Abstract

The application provides a double-rotor composite motor pump, which comprises two end covers, a rotating shaft, two flow distribution plates, a shell, an outer rotor, a driving structure, plungers, a cylinder body and an inner rotor, the two flow distribution plates are connected to the inner sides of the two end covers, the shell is between the two flow distribution plates, the inner sides of the two flow distribution plates are connected to the cylinder body, the two ends of the rotating shaft penetrating through the two end parts of the flow distribution plates are rotationally connected to the two end covers, the inner rotor is connected to the rotating shaft, the outer rotor is rotationally connected between the cylinder body and the shell, the driving structure is connected between the inner rotor and the outer rotor, the inner rotor and the outer rotor are both provided with inclined surfaces, a plurality of plungers are connected to the cylinder body, and the plungers on the two sides are connected to the inclined surfaces on the two sides of the inner rotor and the outer rotor. The application has the advantages of compact structure, flexible control, increased motor magnetic density, improved overall power density, realized radial expansion, realized multi-rotor topological structure, improved pump displacement, effectively reduced pulsation and vibration, improved work efficiency and energy utilization, balanced pressure, and increased service life of the motor pump.

Description

Technical Field

[0001] This invention relates to the field of electric motor pump technology, and more particularly to a dual-rotor composite electric motor pump. Background Technology

[0002] Electric motors, as the power source for driving pumps, play a crucial role in aerospace, industrial manufacturing, and many other fields. Traditional electric pump layouts typically employ a series configuration of "motor + coupling + pump." While this structure meets basic driving requirements to some extent, it also has several inherent drawbacks. Specifically, this traditional structure is often bulky, occupying a significant amount of space and hindering lightweight and compact design. Furthermore, due to the long transmission chain, substantial power losses occur during energy transfer, reducing the overall system efficiency.

[0003] To address these challenges, motor-pump systems are gradually evolving towards integration and unification. Under this trend, researchers have explored various innovative integration solutions. Among them, radially integrated motor-pump systems represent a promising design approach. This solution achieves a highly compact structure by tightly integrating the motor and pump in the radial direction, effectively reducing the size and weight of the equipment. Simultaneously, the shared rotor structure reduces intermediate transmission links, lowers power losses, and improves the overall system efficiency.

[0004] However, radially integrated motor-pump systems also face several technical challenges during the design process. In particular, the sealing of the pump shaft oil has become a key factor limiting performance improvement. To prevent oil leakage, a rotary dynamic seal is required. However, this not only increases system complexity and manufacturing costs but may also shorten the lifespan due to friction and wear, increasing maintenance difficulty and costs. Furthermore, regardless of whether it's radial integration or other forms of integration, a comprehensive consideration and redesign of the motor and pump structures is necessary to ensure a perfect match in terms of performance and structure.

[0005] Therefore, the present invention aims to provide an innovative motor pump design to solve the problems existing in the prior art and meet the urgent needs of aerospace and other fields for efficient, compact and lightweight power systems. Summary of the Invention

[0006] In response to the aforementioned technical problems, a dual-rotor composite motor pump is provided.

[0007] The technical means employed in this invention are as follows:

[0008] A dual-rotor composite motor pump includes: two end covers, a rotating shaft, two distribution plates, a housing, and an outer rotor, a drive structure, a plunger, a cylinder, and an inner rotor disposed within the housing. The two end covers are distributed on both sides, and the two distribution plates are respectively connected to the inner sides of the two end covers. The housing is connected between the two distribution plates, and the inner sides of the two distribution plates are each connected to a cylinder. The rotating shaft is placed inside the housing, and each side of the rotating shaft passes through the cylinder and the distribution plate sequentially from the inside to the outside. The two ends of the rotating shaft that extend out of the distribution plates are respectively rotatably connected to the two end covers.

[0009] The inner rotor is connected to the rotating shaft, and the outer rotor is sleeved on the outside of the inner rotor. The two sides of the outer rotor are rotatably connected between the cylinder and the outer shell. The drive structure is connected between the inner rotor and the outer rotor and is used to drive the inner rotor and the outer rotor to rotate. Both sides of the inner rotor and the outer rotor have inclined surfaces. Multiple plungers are connected to each cylinder. The plungers on both sides are connected to the inclined surfaces on both sides of the inner rotor and the outer rotor.

[0010] The outer casing has first through holes on both sides of its sidewalls, which serve as oil inlets. The outer rotor has second through holes on both sides of its sidewalls, which communicate with the interior of the outer rotor. Both the first and second through holes communicate with the space between the outer casing and the outer rotor. The outer wall of the distribution plate has an opening that serves as an oil outlet.

[0011] Furthermore, the drive structure includes multiple outer permanent magnets, windings, a stator, and multiple inner permanent magnets. The two sides of the stator are respectively connected to two cylinders. The inner and outer walls of the stator are wound with windings. The multiple outer permanent magnets are circumferentially attracted to the inner wall of the outer rotor, and the multiple inner permanent magnets are circumferentially attracted to the outer wall of the inner rotor.

[0012] Furthermore, the cylinder body includes an inner cylinder and an outer cylinder, the inner cylinder being disposed inside the outer cylinder, and both the inner and outer cylinders having multiple circumferentially distributed plunger holes, each plunger hole being connected to a plunger, the plunger performing reciprocating linear motion within the plunger hole.

[0013] Furthermore, a central compression spring is also provided inside the plunger hole. The central compression spring is connected to the tail of the plunger. The central compression spring ensures that the plunger always keeps in close contact with the surfaces of the inner and outer rotors when no external force is applied.

[0014] Furthermore, the plunger includes a plunger body, the plunger body has a channel inside, the head of the plunger body has a through hole communicating with the channel, and a first one-way valve is provided in the channel.

[0015] Furthermore, the head of the plunger body is connected to the inclined surfaces of the inner and outer rotors via a slipper.

[0016] Furthermore, the first one-way valve includes a small ball, a spring, and a spiral cap. The spiral cap is connected to the tail end of the channel, and both ends of the spiral cap are connected to the small ball and the spiral cap, respectively. The small ball is close to the head of the plunger body, and the spiral cap has a through hole inside, which communicates with the channel and the plunger hole.

[0017] Furthermore, the distribution plate has a first annular flow channel and a second annular flow channel circumferentially arranged inside, and a radial flow channel arranged in a direction parallel to the radial direction; both the first annular flow channel and the second annular flow channel are connected to the radial flow channel, and the radial flow channel is connected to the opening on the distribution plate;

[0018] The distributor plate has a plurality of third through holes and a plurality of fourth through holes arranged in a circle on one side near the cylinder body. The plurality of third through holes are distributed on the outer ring of the plurality of fourth through holes. The plurality of third through holes are connected to the first annular flow channel, and the plurality of fourth through holes are connected to the second annular flow channel.

[0019] A second one-way valve is provided in both the third and fourth through holes.

[0020] Furthermore, the second check valve includes a pressure plate, a ball, a spring, and a screw, the screw being connected to the distribution plate, the two ends of the spring being connected to the ball and the screw respectively, and the ball being located between the pressure plate and the spring;

[0021] The third through hole has a first groove on the side near the cylinder body, and the fourth through hole has a second groove on the side near the cylinder body. The pressure plate in the third through hole is placed in the first groove, and the pressure plate in the fourth through hole is placed in the second groove. The pressure plate has a through hole in the middle, which is used to connect the plunger hole in the cylinder body with the third and fourth through holes.

[0022] Furthermore, the rotating shaft is connected to the end cover via a rotating shaft bearing, the outer side of the outer rotor is connected to the outer casing via a housing bearing, and the inner side is connected to the cylinder via a stator bearing;

[0023] Sealing devices are provided on both sides of the outer casing and between the two distribution plates.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The dual-rotor composite motor pump provided by this invention features a compact dual-rotor structure and flexible control, enabling theoretical multi-stage expansion in the radial direction. The pump motor employs a dual-rotor structure with a magnetically conductive stator positioned in the middle. This design ensures that the two rotors operate without interference, thereby improving the motor's stability and efficiency. Furthermore, based on this principle of magnetically conductive stator in the middle of the dual rotors, it can be further expanded into a radial topology. This structure allows for configurations with multiple rotors, multiple stators, and multiple cylinders, improving the pump's working efficiency and stability, and providing a more efficient and stable fluid transfer solution for various other application scenarios.

[0026] 2. The dual-rotor composite motor pump provided by this invention has a distribution plate placed between the distribution end face of the cylinder block and the pump's suction and pressure channels. The design of the distribution plate ensures that the suction and pressure channels can be accurately switched to the correct positions at each stage of the plunger's movement. When the plunger moves forward, it can draw in liquid; and when the plunger moves backward, it can discharge liquid.

[0027] 3. The dual-rotor composite motor pump provided by the present invention is filled with oil inside and has a sealing device attached to the outer shell to prevent leakage.

[0028] 4. The dual-rotor composite motor pump provided by the present invention improves the pump's oil suction and discharge efficiency and realizes the coordinated movement of multiple rotors and multiple cylinders.

[0029] Based on the above reasons, this invention can be widely applied in fields such as aerospace. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a two-dimensional cross-sectional view of the dual-rotor composite motor pump of the present invention.

[0032] Figure 2 This is a cross-sectional view of the motor unit of the dual-rotor composite motor pump of the present invention.

[0033] Figure 3 This is a pump unit diagram of the dual-rotor composite motor pump of the present invention.

[0034] Figure 4 This is a view of the plunger assembly of the present invention.

[0035] Figure 5This is a schematic diagram of the structure of the slipper, plunger, and cylinder of the present invention.

[0036] Figure 6 This is a schematic diagram of oil flow during the operation of the dual-rotor composite motor pump of the present invention.

[0037] Figure 7 This is a three-dimensional sectional view of the outer rotor of the dual-rotor composite motor pump of the present invention.

[0038] Figure 8 This is a schematic diagram of the three-dimensional structure of the stator of the dual-rotor composite motor pump of the present invention.

[0039] Figure 9 This is a two-dimensional cross-sectional view of the stator of the dual-rotor composite motor pump of the present invention and a schematic diagram of the liquid flow direction.

[0040] In the diagram: 1. End cap; 2. Housing bearing; 3. Shaft; 4. Shaft bearing; 5. Stator bearing; 6. Housing; 7. Outer rotor; 8. Stator; 9. Plunger; 10. Plunger body; 91. Ball; 92. Spring; 93. Screw cap; 11. Distribution plate; 12. First check valve; 13. Second check valve; 14. Inner cylinder; 15. Outer cylinder; 16. Outer permanent magnet; 17. Winding; 18. Inner rotor; 19. Inner permanent magnet; 20. Central compression spring; 21. Sealing ring. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0045] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0046] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0047] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0048] This invention provides a dual-rotor composite motor pump, specifically focused on the aerospace field's unique application scenarios requiring highly integrated design and high power density. With the rapid development of aerospace technology, the demands on power systems are increasingly stringent, requiring not only powerful driving capabilities but also meeting multiple standards such as lightweight design, compactness, and high efficiency. Therefore, this invention aims to provide an innovative motor pump solution to meet the specific needs of this field.

[0049] The dual-rotor composite motor pump of this invention consists of two rotors, inner and outer, corresponding to inner and outer cylinders respectively. This double-layer structure not only improves the pump's working efficiency but also makes the entire system more compact and stable. The inner and outer rotors of this invention function as swashplate rotors, enabling rapid oil intake and discharge. Theoretically, this allows for an increase in the pump's displacement by expanding the topology of the inner and outer rotors.

[0050] The purpose of this invention is to use an electric motor pump for oil suction and discharge. To make the above-mentioned objectives, features, and advantages of this invention more apparent and understandable, the following description is provided in conjunction with the accompanying drawings. Figures 1-9 Please provide an explanation.

[0051] like Figure 1 As shown in the figure, this is a two-dimensional cross-section of the dual-rotor composite motor pump of the present invention. The positional relationship of each component is clearly visible in the figure. The motor pump of the present invention mainly includes two end covers 1, a rotating shaft 3, a motor stator 8, inner and outer rotors (inner rotor 18, outer rotor 7), inner and outer permanent magnets (inner permanent magnet 19), a cylinder, slippers, a plunger 9, two distribution plates 11, a one-way valve inside the plunger 9 and within the distribution plate 11, a housing 6, bearings, and other structures. The outer rotor 7, outer permanent magnet 16, winding 17, stator 8, multiple inner permanent magnets 19, plunger 9, cylinder, and inner rotor 18 are disposed within the housing 6. The outer permanent magnet 16, winding 17, stator 8, and multiple inner permanent magnets 19 constitute the drive structure. The dual-rotor composite motor pump has a fixed dual-rotor and stator structure, as shown in the figure. Figure 1 As shown.

[0052] Two end caps 1 are distributed on both sides, and two distribution plates 11 are respectively connected to the inner sides of the two end caps 1. The outer shell 6 is connected between the two distribution plates 11. The inner sides of the two distribution plates 11 are connected to the cylinder body. The rotating shaft 3 is placed inside the outer shell 6. Each side of the rotating shaft 3 passes through the cylinder body and the distribution plate 11 from the inside to the outside in sequence, and the two ends of the rotating shaft 3 that pass through the distribution plates 11 are respectively rotatably connected to the two end caps 1 through the rotating shaft bearings 4. The inner rotor 18 is mounted on the rotating shaft 3, and the outer rotor 7 is sleeved on the outside of the inner rotor 18. The two sides of the outer rotor 7 are rotatably connected between the cylinder body and the outer shell 6. The drive structure is connected between the inner rotor 18 and the outer rotor 7 to drive the inner rotor 18 and the outer rotor 7 to rotate. The outer side of the outer rotor 7 is connected to the outer shell 6 through the outer shell bearing 2, and the inner side is connected to the cylinder body through the stator bearing 5. The outer rotor 7 rotates through the bearings. Both sides of the inner rotor 18 and the outer rotor 7 have inclined surfaces. Multiple plungers 9 are connected to each cylinder, and the plungers 9 on both sides are connected to the inclined surfaces on both sides of the inner rotor 18 and the outer rotor 7. The side walls of the outer casing 6 have first through holes serving as oil inlets, and the side walls of the outer rotor 7 have second through holes communicating with the interior of the outer rotor 7. Both the first and second through holes communicate with the space between the outer casing 6 and the outer rotor 7. The outer wall of the distribution plate 11 has an opening serving as an oil outlet. The stator 8 is connected to the two cylinders on both sides. Windings 17 are wound around both the inner and outer walls of the stator 8. Multiple external permanent magnets 16 are circumferentially attracted to the inner wall of the outer rotor 7, and multiple internal permanent magnets 19 are circumferentially attracted to the outer wall of the inner rotor 18. The assembly sequence is as follows: first assemble the motor part, then assemble the shaft 3, inner rotor 18, internal permanent magnets 19, stator 8, windings 17, outer rotor 7, and external permanent magnets 16 in that order from the inside out, connected by bearings.

[0053] The electric pump of this invention is mainly divided into a motor unit and a pump unit. The motor unit mainly includes a stator (8), an inner rotor 18, and an outer rotor 7. The pump unit mainly includes a cylinder, a plunger (9), a slipper, and a distribution plate (11). In the motor unit, the inner and outer rotors of the motor and the permanent magnets adsorbed on the inner and outer rotors are inclined. The reciprocating motion of the plunger 9 in the pump body is realized by the rotation of the dual rotor structure, thereby realizing the pump's oil suction and discharge.

[0054] The inner and outer rotors, stator 8, and permanent magnets in the motor unit are coaxial.

[0055] like Figure 2 The diagram shows a two-dimensional cross-sectional view of the motor section of a dual-rotor composite motor pump, illustrating the relative positions of the motor shaft 3, inner rotor 18, stator 8, and outer rotor 7. Figure 7 The image shown is a three-dimensional sectional view of the outer rotor. Figure 8 This is a three-dimensional structural diagram of the stator. Figure 9 This is a two-dimensional cross-sectional view of the stator and a schematic diagram of the liquid flow direction.

[0056] The cylinder body includes an inner cylinder 14 and an outer cylinder 15. The inner cylinder 14 is located inside the outer cylinder 15. Both the inner cylinder 14 and the outer cylinder 15 are fixed together with the distribution plate 11 and do not rotate. Both the inner cylinder 14 and the outer cylinder 15 have multiple circumferentially distributed plunger holes. Each plunger hole is connected to a plunger 9 (the plunger 9 is fitted into the plunger hole of the cylinder body with clearances). The plunger 9 performs reciprocating linear motion within the plunger hole. The plunger 9 is an assembly with a first one-way valve 12 inside. The plunger 9 includes a plunger body 10, which has an internal channel. The head of the plunger body 10 has a through hole communicating with the channel, and the first one-way valve 12 is located within the channel. The head of the plunger body 10 is connected to the inclined surfaces of the inner rotor 18 and the outer rotor 7 via a slipper. Figure 5 The diagram shows the structure of the slipper, plunger, and cylinder.

[0057] like Figure 3 The diagram shown is a three-dimensional view of the fit between plunger 9, cylinder block, and distributor plate 11, illustrating the relative fit between the pump body units of the dual rotor motor pump. The number of plungers is odd (the purpose of setting the number of plungers to odd is to reduce the pulsation of the instantaneous theoretical flow rate of the plunger pump).

[0058] The electric pump also includes a central compression spring 20 disposed within the plunger bore, which is connected to the tail of the plunger 9. In a stationary state, the plunger 9 is installed in plunger bores evenly distributed within the inner and outer cylinder bodies. A slipper is mounted on the head of the plunger 9. Due to the action of the central compression spring 20, the plunger 9 remains in contact with the surfaces of the inner and outer rotors of the motor. The plunger 9 is in contact with the inner and outer rotors. Both the left and right sides of the inner and outer rotors of the motor are inclined surfaces. When the inner and outer rotors rotate, the plunger 9 performs reciprocating linear motion within the plunger bore (the plunger 9 performs left-right linear reciprocating movement, without circular rotation), thereby achieving the oil suction and discharge actions. Furthermore, the plunger 9 is reset under the action of the central compression spring 20.

[0059] The first check valve 12 installed inside the plunger 9 prevents oil backflow, while a central compression spring 20 ensures that the plunger 9 and the slipper are in contact with the inclined sides of the outer rotor 7 and the inner rotor 18, and the central compression spring 20 is always in a compressed state. Similarly, a second check valve 13 is also installed at the junction of the distribution plate 11 and the inner and outer plunger holes, also to prevent oil backflow.

[0060] The first one-way valve 12 includes a small ball 91, a spring 92, and a screw cap 93. The screw cap 93 is connected to the tail end of the channel, and its two ends are connected to the small ball 91 and the screw cap 93, respectively. The small ball 91 is close to the head of the plunger body 10. The screw cap 93 has a through hole inside, which communicates with the channel and the plunger hole. The tail end of the screw cap 93 is connected to the head end of the central compression spring 20, and the tail end of the central compression spring 20 is connected to the inner wall of the plunger hole.

[0061] like Figure 4The diagram shows a cross-sectional view of the plunger assembly, which can be seen to consist of a plunger body 10, a small ball 91, a spring 92, and a screw cap 93. The small ball 91, spring 92, and screw cap 93 form a one-way channel, allowing oil to flow only from left to right and preventing backflow. The plunger body 10 has an opening to allow oil flow, connecting the inlet and outlet ports.

[0062] The distribution plate 11 has a first annular flow channel and a second annular flow channel circumferentially arranged inside, and a radial flow channel arranged in a direction parallel to the radial direction; the first annular flow channel and the second annular flow channel are both connected to the radial flow channel, and the radial flow channel is connected to the opening on the distribution plate 11; the distribution plate 11 has a plurality of third through holes and a plurality of fourth through holes circumferentially distributed on the side near the cylinder body, the plurality of third through holes are distributed on the outer ring of the plurality of fourth through holes, the plurality of third through holes are connected to the first annular flow channel, and the plurality of fourth through holes are connected to the second annular flow channel; a second one-way valve 13 is provided in both the third through holes and the fourth through holes.

[0063] The second one-way valve 13 includes a pressure plate, a ball, a spring, and a screw. The screw is connected to the distribution plate 11. The two ends of the spring are connected to the ball and the screw, respectively. The ball is located between the pressure plate and the spring. A first groove is provided on the side of the third through hole near the cylinder body, and a second groove is provided on the side of the fourth through hole near the cylinder body. The pressure plate in the third through hole is placed in the first groove, and the pressure plate in the fourth through hole is placed in the second groove. A through hole is opened in the middle of the pressure plate. The through hole is used to realize the communication between the plunger hole in the cylinder body and the third and fourth through holes.

[0064] In this invention, to ensure accurate coordination between the movement of the plunger 9 and the switching of the oil suction and pressure circuits, a distribution plate 11 is placed between the distribution end face of the cylinder block and the oil suction and pressure channels of the pump. The distribution plate 11 mates with the oil suction and discharge holes of the inner and outer cylinder blocks. The design of the distribution plate 11 ensures that the oil suction and pressure circuits can be accurately switched to the correct positions at each stage of the plunger 9's movement. When the plunger 9 moves forward, it can draw in liquid; and when the plunger 9 moves backward, it can discharge liquid.

[0065] When the motor starts and the inner and outer rotors begin to rotate, the inclined surface design causes the plunger 9 to reciprocate linearly within the plunger bore. As the rotor rotates, the plunger 9 continuously changes its position under the action of the inclined surface, thereby completing the oil suction and discharge actions within the cylinder.

[0066] like Figure 6 The diagram shows the direction of oil flow.

[0067] The dual-rotor composite motor pump is internally filled with oil, and a sealing device is attached to the outer casing 6 to prevent leakage. The sealing device uses sealing rings 21, with sealing rings 21 installed between the left side of the outer casing 6 and the left distribution plate 11, and between the right side of the outer casing 6 and the right distribution plate 11.

[0068] The working principle of the dual-rotor section: Based on the interaction of electromagnetic induction and electromagnetic force, the inner and outer rotors are each equipped with precision windings 17. When the external power supply is turned on, current flows through the windings 17, generating an electromagnetic field. According to the law of electromagnetic induction, when the magnetic field changes, an induced electromotive force is generated in the conductor, thereby generating an induced current. In the dual-rotor motor pump, this electromagnetic field not only causes the windings 17 themselves to produce a magnetic effect, but also drives the inner and outer rotors to rotate relative to each other (the inner and outer rotors rotate in the same direction) through the interaction between the magnetic fields.

[0069] The working principle of the pump section: In a static state, the plungers 9 are installed in plunger holes evenly distributed in the cylinder body. The heads of these plungers 9 are equipped with slippers, which reduces the friction between the plungers 9 and the inner and outer rotors, making the plungers 9 move more smoothly. Specifically, the slippers are connected to the inner and outer rotors, reducing the friction between the plungers 9 and the inner and outer rotors, forming a wedge-shaped gap between the slippers and the inner and outer rotors, forming a stable oil film, reducing friction, and filling the gap. In order to maintain close contact between the plungers (9) and the inner and outer rotor surfaces of the motor, the system adopts a central compression spring. The central compression spring ensures that the plungers 9 can always be in close contact with the rotor surface when no external force is applied, thereby ensuring the stability and sealing of the pump.

[0070] This invention has the advantages of modularity, economy and practicality, and stable and reliable operation. The dual rotor motor used is not only applicable to the motor pump proposed in this invention, but also applicable to other motor fields, such as electric vehicles.

[0071] The dual-rotor, dual-swashplate pump device of this invention features a compact structure and flexible control. The dual rotors are inclined, which better increases the motor's magnetic flux density and improves the overall power density. Simultaneously, it allows for radial expansion, realizing a multi-rotor topology and further increasing the pump's displacement. Compared to conventional plunger pumps, the dual-swashplate design effectively reduces pulsation and vibration, improves working efficiency and energy utilization, balances pressure, and increases the service life of the motor and pump.

[0072] In this invention, the inner and outer rotors cooperate with each other, both equipped with precision windings 17, and interact through the principle of electromagnetic induction to drive the swashplate rotor to rotate. This dual-rotor design not only significantly improves the power density of the motor but also optimizes energy utilization efficiency, enabling it to output powerful performance within a compact size.

[0073] In this invention, the composite pump consists of inner and outer rotors with inclined surfaces connected to the plunger 9 via slippers. Driven by the swashplate rotor, the plunger 9 reciprocates within the pump chamber, achieving the function of fluid intake and discharge. An outlet (oil drain port) and a fluid channel corresponding to the plunger 9 are provided above the distribution plate 11. When the plunger 9 moves, the fluid channel on the distribution plate 11 engages with the plunger 9, enabling fluid intake and discharge. Oil is drawn in from the head side of the plunger 9, passes through the first one-way valve 12, and is discharged into the flow channel within the distribution plate 11 through the tail side of the plunger 9, exiting from the oil drain port of the distribution plate 11.

[0074] The double-swashplate structure of the pump unit helps to distribute pressure more evenly within the motor pump, generating better force balance and ensuring a more uniform suction and discharge process. This contributes to a smoother and more uniform fluid flow. Furthermore, this composite pump employs a dual-rotor structure with two symmetrical rotors. During operation, the suction and discharge processes of each rotor are synchronous and opposite. This symmetry effectively reduces pulsation and vibration, improves efficiency, lowers energy consumption, and extends the service life of the motor pump.

[0075] Both dual-rotor and compound pumps can increase the redundancy of the motor pump. Under normal conditions, the two rotors can work simultaneously, providing greater output power. However, if one rotor fails, the other rotor can still operate independently, ensuring that the system does not completely fail. In the compound pump section, the left and right swashplate rotors and the distribution plate 11 form multiple independent fluid channels. If one channel becomes blocked or leaks, the other channels can still function normally.

[0076] The dual-rotor motor can be controlled via an external driver, which controls the speed of the dual-rotor motor by controlling the current in the control coil (winding 17). The compound pump operates by the motor driving the swashplate rotor, causing the plunger 9 to reciprocate axially along the pump cylinder. When the plunger 9 moves forward (suction stroke), the volume inside the pump cylinder increases, creating a low-pressure area that draws liquid into the pump; conversely, when the plunger 9 moves backward (discharge stroke), the volume inside the pump cylinder decreases, compressing the liquid and discharging it under high pressure.

[0077] The tilt angle of the swashplate rotor in the composite pump part of this invention can be adjusted according to pumping requirements to change the plunger stroke and the pump output flow. The swashplate rotor can increase the magnetic flux density of the motor to a certain extent and improve the power density of the motor unit.

[0078] This invention relates to a motor-pump motor employing a dual-rotor structure with a magnetically conductive stator positioned in the middle. This design ensures that the two rotors operate without interference, thereby improving the motor's stability and efficiency. Furthermore, based on this principle of magnetically conductive stator in the middle of the dual rotors, it can be further extended to a radial topology. This structure allows for configurations with multiple rotors, multiple stators, and multiple cylinders, improving the pump's working efficiency and stability, and providing a more efficient and stable fluid transfer solution for various other application scenarios.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-rotor compound motor pump characterized by, The utility model relates to a kind of motor, including: Two end covers (1), rotating shaft (3), two flow distribution plates (11), shell (6) and the outer rotor (7) being arranged in shell (6), driving structure, plunger (9), cylinder and inner rotor (18), the two end covers (1) are distributed in both sides, the two flow distribution plates (11) are connected in the inside of two end covers (1) respectively, the shell (6) is connected between the two flow distribution plates (11), the inside of the two flow distribution plates (11) is connected with cylinder, the rotating shaft (3) is placed in shell (6), the rotating shaft (3) every side passes through cylinder, flow distribution plate (11) from inside to outside in turn, and the two ends of two sides and wear out flow distribution plate (11) are respectively connected with two end covers (1) rotationally; The inner rotor (18) is connected on the rotating shaft (3), the outer rotor (7) is sleeved on the outside of the inner rotor (18), the two sides of the outer rotor (7) are rotatably connected between the cylinder and the shell (6), the driving structure is connected between the inner rotor (18) and the outer rotor (7), for driving the inner rotor (18) and the outer rotor (7) rotation;The two sides of the inner rotor (18) and the outer rotor (7) are provided with inclined surface, a plurality of plungers (9) are connected on each cylinder, the plunger (9) on both sides is connected with the inclined surface of the inner rotor (18) and the outer rotor (7) two sides; The side wall of the shell (6) is provided with first through hole as oil inlet on both sides, the side wall of the outer rotor (7) is provided with second through hole communicated with the inside of the outer rotor (7) on both sides, the first through hole and the second through hole are communicated with the space between the shell (6) and the outer rotor (7);The outer wall of the flow distribution plate (11) is provided with opening as oil outlet; The cylinder includes inner cylinder (14) and outer cylinder (15), the inner cylinder (14) is arranged in the inside of the outer cylinder (15), the inner cylinder (14) and the outer cylinder (15) are all provided with a plurality of plunger holes circumferentially distributed, the plunger (9) is connected in each plunger hole, the plunger (9) reciprocates linearly in the plunger hole; The plunger (9) includes plunger body (10), the head of the plunger body (10) is connected with the inclined surface of the inner rotor (18) and the outer rotor (7) through skid shoe; The rotating shaft (3) is connected with end cover (1) through rotating shaft bearing (4), the outside of the outer rotor (7) is connected with shell (6) through shell bearing (2), and the inside is connected with cylinder through stator bearing (5); The both sides of the shell (6) and the two flow distribution plates (11) are provided with sealing device.

2. The dual-rotor composite motor pump of claim 1, wherein, The driving structure includes a plurality of outer permanent magnets (16), winding (17), stator (8) and a plurality of inner permanent magnets (19), the both sides of the stator (8) are connected with two cylinders respectively, the inner and outer walls of the stator (8) are all wound with winding (17), the plurality of outer permanent magnets (16) are adsorbed on the inner wall of the outer rotor (7) along the circumference, the plurality of inner permanent magnets (19) are adsorbed on the outer wall of the inner rotor (18) along the circumference.

3. The dual-rotor composite motor pump of claim 1, wherein, The plunger hole is also provided with a center compression spring (20) connected with the tail of the plunger (9), and the plunger (9) is always close to the surface of the inner rotor (18) and the outer rotor (7) by the center compression spring (20) when not subjected to external force.

4. The dual-rotor composite motor pump of claim 1, wherein, The plunger body (10) is internally provided with a channel, the head of the plunger body (10) is provided with a through hole in communication with the channel, and the channel is internally provided with a first one-way valve (12).

5. The dual-rotor composite motor pump of claim 4, wherein, The first one-way valve (12) comprises a ball (91), a spring (92) and a screw cap (93), the screw cap (93) is connected at the tail of the channel, the two ends of the spring (92) are respectively connected with the ball (91) and the screw cap (93), the ball (91) is close to the head of the plunger body (10), and the screw cap (93) is internally provided with a through hole in communication with the channel and the plunger hole.

6. The dual-rotor composite motor pump of claim 1, wherein, The inner part of the distribution disc (11) is circumferentially provided with a first annular flow channel and a second annular flow channel, and is provided with a radial flow channel in parallel with the radial direction; the first annular flow channel and the second annular flow channel are both in communication with the radial flow channel, and the radial flow channel is in communication with the opening on the distribution disc (11); The side of the distribution disc (11) close to the cylinder is provided with a plurality of third through holes and a plurality of fourth through holes distributed in a circle, the plurality of third through holes are distributed in the outer circle of the plurality of fourth through holes, the plurality of third through holes are in communication with the first annular flow channel, and the plurality of fourth through holes are in communication with the second annular flow channel; The third through hole and the fourth through hole are both provided with a second one-way valve (13).

7. The dual-rotor composite motor pump of claim 6, wherein, The second one-way valve (13) comprises a pressing plate, a ball, a spring and a screw, the screw is connected on the distribution disc (11), the two ends of the spring are respectively connected with the ball and the screw, and the ball is located between the pressing plate and the spring; The side of the third through hole close to the cylinder is provided with a first groove, the side of the fourth through hole close to the cylinder is provided with a second groove, the pressing plate in the third through hole is placed in the first groove, the pressing plate in the fourth through hole is placed in the second groove, a through hole is formed in the middle of the pressing plate, and the through hole is used to realize the communication between the plunger hole in the cylinder and the third through hole and the fourth through hole.

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