A coaxial servo motor pump with integrated drive and control functions

Abstract

The present application discloses a coaxially integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a controller housing, and an electrical connector. The motor pump housing is provided with a blind hole, a first cavity for accommodating a plunger pump assembly, and a second cavity for accommodating a servo motor assembly, wherein the plunger pump assembly and the servo motor assembly are connected via a rotating shaft. The controller housing is connected to one end of the motor pump housing, and a drive controller is provided within the controller housing. The blind hole communicates with the second cavity, and the electrical connector is sealed and connected to the blind hole, and the electrical connector is electrically connected to the servo motor assembly and the drive controller. The distribution plate and the sealing assembly are respectively sealed with both ends of the motor pump housing. Cooling is achieved through a cooling oil channel, which connects from one end of the motor pump housing near the plunger pump assembly to the second cavity and then divides into two paths, one path passing through the center of the rotating shaft, and the other path connecting to the first cavity and passing through the distribution plate. The coaxial integration of the drive control functions is achieved, and the cooling effect is good.

Description

Technical Field

[0001] The present invention relates to a coaxial integrated servo motor pump with drive control functions, which can quickly connect to a hydraulic cylinder, realize rapid industrial application, and at the same time has good maintainability. Background Art

[0002] Modern advanced electronics, information technology, materials science, and manufacturing technologies are developing rapidly. While these new technologies have challenged and competed with hydraulics in certain areas (e.g., full electrification), they have also created opportunities for the further development of hydraulics. For example, the integration of modern advanced digital technology, network technology, motor and drive control technology, sensor technology, and intelligent manufacturing technology with hydraulics is driving modern hydraulics toward a more integrated, high-end, intelligent, autonomous, digitally interconnected, green, environmentally friendly, energy-efficient, efficient, reliable, and convenient future. This is of great significance for countries and their enterprises to leverage technology to seize the competitive advantage and contribute to the construction of a resource-saving and environmentally friendly society.

[0003] The electro-hydraulic actuation (EHA) system, centered around servo motor pumps, has flourished in recent years, aligning with both societal needs and technological trends for electrification, intelligent systems, and energy conservation and environmental protection (they offer approximately 70% higher efficiency than traditional hydraulic systems). The development of electrified hydraulic products for the hydraulic industry, centered around servo motor pumps, is experiencing rapid growth. The servo motor pump is the core control and power element of the EHA. By controlling the speed and direction of the servo motor through variable frequency drive, it achieves directional control and four-quadrant operation of the hydraulic pump, outputting a controlled flow of hydraulic fluid to drive the movement of the hydraulic actuator. The servo motor pump integrates the oil pump, servo motor, hydraulic valve, drive controller, and network communication modules as needed.

[0004] Currently, the market mainly focuses on split-type products of "(motor + pump) + external drive controller", while integrated products of "motor + pump + integrated drive controller" are also beginning to appear. However, the market has not yet seen a deeply integrated product of "coaxial integration of motor and pump + integrated drive controller". The "coaxial integration of motor and pump + integrated drive controller" product involved in the present invention is mainly aimed at application scenarios that require human-machine friendliness, simplicity and ease of use, energy saving and high efficiency, low noise and environmental protection, and good cost performance. Summary of the Invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and provide a coaxial integrated servo motor pump with drive control function, which can realize energy conversion and at the same time has the characteristics of highly integrated output control function.

[0006] The coaxial integrated servo motor pump module integrates the servo motor and hydraulic pump in a coaxial and common housing. It has high dynamic response and can achieve control within a response time of less than 10 milliseconds. It can perform variable speed work according to actual working conditions. The maximum speed is 7000 rpm, the maximum output flow is 48L / min, the maximum output pressure is 21MPa, and it also has good energy-saving effects.

[0007] The technical solution of the present invention is:

[0008] A coaxial integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a plunger pump assembly, a servo motor assembly, a controller housing, a drive controller, an electrical connector, a port plate, a sealing assembly, and an internal cooling oil circuit;

[0009] The motor pump housing is provided with a first cavity for accommodating a plunger pump assembly and a second cavity for accommodating a servo motor assembly. The plunger pump assembly includes a plunger pump rotor. The servo motor assembly includes a stator assembly and a rotor assembly. The plunger pump rotor and the rotor assembly are coaxially connected via a rotating shaft.

[0010] The controller housing is connected to one end of the motor pump housing, and the drive controller is located in the controller housing;

[0011] The motor pump housing is provided with a blind hole, the blind hole being located on one side of the second cavity and communicating with the second cavity. The electrical connector is sealed and connected in the blind hole. The inner side of the electrical connector is connected to the stator assembly of the servo motor in the second cavity via a lead passing through the blind hole. The outer side of the electrical connector is electrically connected to the drive controller via a wire.

[0012] The distribution plate is located in the first cavity and is used to support one end of the rotating shaft close to the plunger pump assembly. The sealing assembly is sealed in the second cavity and is used to support the other end of the rotating shaft.

[0013] A cooling oil channel is set for cooling. The cooling oil channel is connected from one end of the motor pump housing close to the plunger pump assembly to the second cavity, and then divided into two paths, one path passes through the center of the rotating shaft, and the other path connects to the first cavity and passes through the distribution plate.

[0014] The sealing assembly includes an end cover and a back cover. The end cover is connected to the second cavity, and the end cover and the inner wall of the second cavity are sealed. The rotating shaft is rotatably connected to the end cover, and the back cover is connected to the side of the end cover facing the drive controller, and the back cover and the end cover are sealed.

[0015] The end cover is provided with a through hole, and the rotating shaft passes through the through hole. The rear cover is provided with a stopper inserted into the through hole at a position opposite to the through hole. A first sealing groove is provided in the circumference of the stopper, and a first sealing ring is provided in the first sealing groove. The first sealing ring is used to seal between the boss and the inner wall of the through hole; a second sealing groove is provided on the outer circumferential surface of the end cover, and a second sealing ring is provided in the second sealing groove. The second sealing ring is used to seal between the end cover and the inner wall of the motor pump housing.

[0016] A third sealing groove is provided on the circumference of the electrical connector, a third sealing ring is provided in the third sealing groove, and the third sealing ring is used to seal the blind hole.

[0017] The internal cooling oil circuit includes a cooling oil groove, a center hole, and a low-pressure oil drain hole. The cooling oil groove runs from one end of the motor pump housing close to the plunger pump assembly to the inner wall of the second cavity away from the plunger pump assembly. The center hole runs through the axial position of the rotating shaft, and the low-pressure oil drain hole runs through the distribution plate.

[0018] The motor pump housing is provided with a plurality of cooling oil grooves, and the plurality of cooling oil grooves are evenly distributed with the rotating shaft as the axis.

[0019] The motor pump housing is provided with a first annular groove, which is located at one end of the motor pump housing close to the plunger pump assembly. The first annular groove is connected to multiple cooling oil grooves. The motor pump housing is provided with a cold oil inlet at one end close to the plunger pump assembly, and the cold oil inlet is connected to the cooling oil grooves.

[0020] The motor pump housing is provided with a second annular groove, which is located at one end of the motor pump housing away from the plunger pump assembly. The second annular groove is connected to the plurality of cooling oil grooves and the inner wall of the second cavity.

[0021] A plurality of heat dissipation grooves for dissipating heat are provided on the outer circumference of the motor pump housing.

[0022] A cooling fan is installed on the side of the controller housing facing away from the motor pump housing.

[0023] In summary, this application has at least the following beneficial technical effects:

[0024] The coaxial servo motor pump with integrated drive and control functions described in this invention integrates a coaxial servo motor pump module, a drive control module, and quick-connect plugs. It is fully assembled and tested before shipment and requires only two plugs for operation. Compared to traditional motor pump units, this product reduces installation, commissioning, wiring, and troubleshooting time, eliminates the need for additional electrical cabinets, and saves installation space.

[0025] 2. The drive control module is located at the rear end of the integrated servo motor pump module, and the sealed electrical connector seals the oil inside the motor pump from the outside (the oil does not enter the drive controller module).

[0026] 3. The control socket and high-voltage socket on the motor pump housing are connected to the external cable plug and control plug. The external connection is simple and convenient. Compared with the traditional connection method, it reduces the two plugs of the controller, has no external wiring, and the installation method is simpler and more convenient.

[0027] 4. To ensure the servo motor pump can operate reliably and for extended periods, cooling oil channels are provided inside the housing and multiple cooling oil channels are provided between the housing and the motor stator. Cooling oil (cold oil) introduced through the motor pump cooling port enters the servo motor pump, promptly removing heat generated by the servo motor and pump. The resulting hot oil (hot oil) flows back to the EHA system for cooling and recycling. The motor pump cooling port is integrated with the EHA system.

[0028] 5. A heat dissipation slot structure is opened on the outside of the motor pump housing to increase the heat dissipation area. A cooling fan is added to the tail of the controller to ensure the heat dissipation and working stability of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a coaxial integrated servo motor pump with integrated drive control functions in an embodiment of the present application;

[0030] Figure 2 This is an appearance diagram of a coaxial integrated servo motor pump with integrated drive control functions in an embodiment of the present application;

[0031] Figure 3 This is a simplified structural diagram of a coaxial integrated servo motor pump with integrated drive control functions in an embodiment of the present application;

[0032] Figure 4 This is a cooling oil circuit diagram of a coaxial integrated servo motor pump with integrated drive control functions in an embodiment of the present application;

[0033] Figure 5 This is a structural diagram of the servo motor pump housing in an embodiment of the present application, wherein: Figure 5 a is a schematic diagram showing the structure of the strong power socket and control socket. Figure 5 b is a structural diagram intended to illustrate a blind hole.

[0034] Description of reference numerals: 1. coaxial integrated servo motor pump; 2. drive controller; 3. high-voltage socket; 4. control socket;

[0035] 5. Plunger pump assembly; 6. Servo motor assembly; 7. Motor pump housing; 71. First cavity; 72. Second cavity; 8. Stator assembly; 9. Electrical connector; 10. Stator lead wire; 11. Resolver lead wire; 12. Third sealing groove; 13. Drive wire; 14. Control wire.

[0036] 15. Cooling fan; 16. Controller housing; 17. Drive board; 18. Control board;

[0037] 19. Rear cover; 20. First sealing groove; 21. Second sealing groove; 22. End cover; 23. Rotor assembly; 25. Rotating shaft; 26. Center hole; 27. Bearing; 29. ​​Port plate; 30. Low-pressure oil drain hole; 31. Left outlet;

[0038] 32. Cold oil inlet; 33. Heat dissipation groove; 34. Cooling oil channel; 36. First through hole; 37. Blind hole; 38. Second through hole; 39. Cooling oil groove; 40. Threaded hole; 41. First annular groove; 42. Second annular groove. DETAILED DESCRIPTION

[0039] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0040] The embodiment of the present application discloses a coaxial integrated servo motor pump with integrated drive control function, such as Figure 1 As shown, the motor pump housing 7, plunger pump assembly 5, servo motor assembly 6, controller housing 16, drive controller 2, electrical connector 9, seal assembly, and internal cooling oil passages constitute the coaxial integrated servo motor pump 1.

[0041] like Figure 3 、 Figure 5 As shown in FIG. 2 , the motor pump housing 7 is provided with a first cavity 71 for accommodating the plunger pump assembly 5 and a second cavity 72 for accommodating the servo motor assembly 6. The plunger pump assembly 5 includes a plunger pump rotor, and the servo motor assembly 6 includes a stator assembly 8 and a rotor assembly 23. The stator assembly 8 is heat-assembled with the motor pump housing 7, and the rotor assembly 23 and the plunger pump rotor share a rotating shaft 25. The controller housing 16 is connected to one end of the motor pump housing 7, and the drive controller 2 is located in the controller housing 16. The motor pump housing 7 is provided with a blind hole 37, which is located on one side of the second cavity 72. The blind hole 37 is connected to the second cavity 72, and the electrical connector 9 is sealed and connected in the blind hole 37. The inner side of the electrical connector 9 is connected to the stator assembly (8) of the second cavity 72 through a lead passing through the blind hole 37, and the outer side of the electrical connector 9 is connected to the drive controller 2 through a wire. Specifically, the drive controller 2 includes a drive board 17 and a control board 18. The drive board 17 is electrically connected to the electrical connector 9 via a drive wire 13, and the control board 18 is electrically connected to the electrical connector 9 via a control wire 14.

[0042] like Figure 2 、 Figure 3 and Figure 5As shown in Figure a, the motor pump housing 7 is provided with a high-voltage socket 3 and a control socket 4. An external high-voltage cable is connected through the high-voltage socket 3. One side of the high-voltage socket 3 is connected to the drive board 17 of the drive controller 2 through a first through-hole 36 on the motor pump housing 7 by a wire. The wire drawn from the drive board 17 is then connected to the outer pin (right side) of the electrical connector 9. The corresponding inner pin (left side) of the electrical connector 9 is connected to the stator lead 10 of the servo motor assembly 6, thereby providing power to the motor pump. The external control signal and motor pump data feedback signal cable is connected to the control board 18 of the drive controller 2 through a second through-hole 38 on the motor pump housing 7 by a wire through the control socket 4. The wire drawn from the control board 18 is connected to the outer pin (right side) of the electrical connector 9. The corresponding inner pin (left side) of the sealed electrical connector 9 is connected to the motor resolver lead 11 of the servo motor assembly 6, thereby controlling the motor pump.

[0043] After being powered on by the drive controller 2 , the servo motor assembly 6 converts electromagnetic force into mechanical power, drives the plunger pump rotor to rotate and generate controllable hydraulic power, thereby realizing bidirectional movement of the hydraulic cylinder.

[0044] The distribution plate 29 is located in the first cavity 71 and is used to support one end of the rotating shaft 25 close to the plunger pump assembly 5. The sealing assembly is sealed in the second cavity 72 and is used to support the other end of the rotating shaft 25.

[0045] like Figure 3 As shown, the electrical connector 9 is provided with a third sealing groove 12 on its circumference. A third sealing ring, an O-ring, is provided within the third sealing groove 12 and is used to seal the blind hole 37. The rotating components of the rotor assembly 23 and the plunger pump assembly 5 operate within the oil-filled motor pump housing 7. To prevent the internal oil from escaping and entering the drive controller 2, the electrical connector 9 is installed at the blind hole 37. Sealing is achieved by installing a double O-ring in the third sealing groove 12 of the electrical connector 9. The electrical connector 9 is connected to the threaded hole 40 in the motor pump housing 7 via screws.

[0046] In addition, the sealing assembly includes an end cap 22 and a rear cover 19. The end cap 22 is connected to the second cavity 72, and the rotating shaft 25 is rotatably connected to the end cap 22. The rear cover 19 is connected to the side of the end cap 22 facing the drive controller 2. The end cap 22 has a through hole, through which the rotating shaft 25 passes. The rear cover 19 has a stopper directly opposite the through hole, which is inserted into the through hole. The stopper has a first sealing groove 20 circumferentially defined therein, and a first sealing ring is located within the first sealing groove 20. The first sealing ring is used to seal between the stopper and the inner wall of the through hole. The outer circumference of the end cap 22 has a second sealing groove 21 defined therein, and a second sealing ring is located within the second sealing groove 21. The second sealing ring is used to seal between the end cap 22 and the inner wall of the motor pump housing 7. Specifically, O-rings are installed in the second sealing groove 21 and the first sealing groove 20, respectively, to achieve a seal between the end cap 22 and the inner wall of the second cavity 72, and between the rear cover 19 and the end cap 22. The entire structure uses a static sealing structure to seal the internal oil of the servo motor pump, isolating the oil from the drive controller 2 on the rear side. The seal is reliable and there is no hidden danger of oil leakage.

[0047] like Figure 3 and Figure 4 As shown, the internal cooling oil circuit includes a cooling oil groove 39, a center hole 26, and a low-pressure oil drain hole 30. The cooling oil groove 39 extends from the end of the motor pump housing 7 near the plunger pump assembly 5 to the inner wall of the second cavity 72 away from the plunger pump assembly 5. The cooling oil groove 39 extends to the outer circumference of the stator assembly 8 at the position of the stator assembly 8. Multiple cooling oil grooves 39 are provided in the motor pump housing 7, and the multiple cooling oil grooves 39 are evenly distributed around the rotating shaft 25. The motor pump housing 7 is provided with a first annular groove 41 and a second annular groove 42. The first annular groove 41 is located at the end of the motor pump housing 7 near the plunger pump assembly 5. The first annular groove 41 connects to the multiple cooling oil grooves 39. The end of the motor pump housing 7 near the plunger pump assembly 5 is provided with a cold oil inlet 32, which is connected to the cooling oil groove 39. The second annular groove 42 is located at the end of the motor pump housing 7 away from the plunger pump assembly 5. The second annular groove 42 connects to the multiple cooling oil grooves 39 and the inner wall of the second cavity 72. The center hole 26 passes through the axis of the rotating shaft 25 , and the low-pressure oil drain hole 30 passes through the distribution plate 29 .

[0048] A groove is defined on the side of the rear cover 19 facing the end of the rotating shaft 25, with the end of the central hole 26 positioned within the groove. An annular portion is defined between the first and second cavities 72 of the motor pump housing 7. The annular portion has an inner diameter smaller than that of the first and second cavities 71, 72. A bearing 27 is positioned between the outer portion of the rotating shaft 25 and the annular portion. Within the groove, one end of the central hole 26 serves as the right inlet for the cooling oil, and the other end serves as the left outlet 31.

[0049] The provision of a cooling oil channel forms a cooling oil channel 34 for supplying oil for cooling. The cooling oil channel 34 connects from one end of the motor pump housing 7 near the plunger pump assembly 5 to the second cavity 72, then splits into two paths. One path passes through the center of the rotating shaft 25, and the other connects to the first cavity 71 and passes through the port plate 29. This solves the heat dissipation and cooling issues of the servo motor pump, and the servo motor pump introduces oil into the system for cooling.

[0050] In order to further increase the heat dissipation effect from the outside, a heat dissipation groove 33 is opened on the outer surface of the motor pump housing 7. In addition, a dustproof and heat dissipation fan 15 is installed in the controller housing 16 to achieve air cooling of the drive controller 2.

[0051] The implementation principles of this application are:

[0052] A portion of the cooler cold oil in the EHA system enters a cooling oil groove 39 through the cold oil inlet 32 ​​on the motor pump housing 7. It is then distributed throughout all the cooling oil grooves 39 through the first annular groove 41 and flows through the cooling oil grooves 39 (passing between the motor stator assembly 8 and the motor pump housing 7), cooling the motor stator assembly 8. It then flows from the second annular groove 42 into the second cavity 72. Part of the cooling oil that enters the second cavity 72 enters the air gap between the motor rotor assembly 23 and the motor stator assembly 8, and part flows in from one end of the center hole 26. This first portion of oil enters the first cavity 71 through the gap in the bearing 27, and then flows back to the EHA system through the low-pressure oil drain hole 30 for further cooling before being recycled. Another portion of the oil flows in through the right side of the center hole 26 in the rotating shaft 25, flows through the center hole 26 into the left outlet 31, and then flows back to the EHA system for further cooling.

[0053] Components or products such as coaxial integrated servo motor pumps and sealed sockets are all involved in existing inventions or are readily available products and can be used as components or parts of the present invention.

[0054] Although the present invention is disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of the present invention.

Claims

1. A coaxial servo motor pump with integrated drive and control functions, characterized by: It includes a motor pump housing (7), a plunger pump assembly (5), a servo motor assembly (6), a controller housing (16), a drive controller (2), an electrical connector (9), a distribution plate (29), a sealing assembly, and a cooling oil channel (34); The motor pump housing (7) is provided with a first cavity (71) for accommodating a plunger pump assembly (5) and a second cavity (72) for accommodating a servo motor assembly (6). The plunger pump assembly (5) includes a plunger pump rotor, and the servo motor assembly (6) includes a stator assembly (8) and a rotor assembly (23). The plunger pump rotor and the rotor assembly (23) are coaxially connected via a rotating shaft (25). The controller housing (16) is connected to one end of the motor pump housing (7), and the drive controller (2) is located in the controller housing (16); The motor pump housing (7) is provided with a blind hole (37), the blind hole (37) is located on one side of the second cavity (72), the blind hole (37) is communicated with the second cavity (72), an electrical connector (9) is sealed and connected in the blind hole (37), the inner side of the electrical connector (9) is connected to the stator assembly (8) of the second cavity (72) through a lead passing through the blind hole (37), and the outer side of the electrical connector (9) is connected to the drive controller (2) through a wire. The distribution plate (29) is sealingly connected to the first cavity (71) and is used to support one end of the rotating shaft (25) close to the plunger pump assembly (5). The sealing assembly is sealingly connected to the second cavity (72) and is used to support the other end of the rotating shaft (25). The cooling oil passage (34) is connected from one end of the motor pump housing (7) close to the plunger pump assembly (5) to the second cavity (72), and then splits into two paths, one path passes through the center of the rotating shaft (25), and the other path connects to the first cavity (71) and passes through the distribution plate (29); The sealing assembly comprises an end cover (22) and a rear cover (19), wherein the end cover (22) is connected to the second cavity (72), the end cover (22) and the inner wall of the second cavity (72) are sealed, the rotating shaft (25) is rotatably connected to the end cover (22), the rear cover (19) is connected to a side of the end cover (22) facing the drive controller (2), and the rear cover (19) and the end cover (22) are sealed; The end cover (22) is provided with a through hole, through which the rotating shaft (25) passes; a stopper is provided at a position of the rear cover (19) facing the through hole and inserted into the through hole; a first sealing groove (20) is provided in the circumference of the stopper; a first sealing ring is provided in the first sealing groove (20); the first sealing ring is used to seal between the stopper and the inner wall of the through hole; a second sealing groove (21) is provided in the outer circumferential surface of the end cover (22); a second sealing ring is provided in the second sealing groove (21); the second sealing ring is used to seal between the end cover (22) and the inner wall of the motor pump housing (7).

2. The coaxial servo motor pump with integrated drive control function according to claim 1, characterized in that: A third sealing groove (12) is provided in the circumference of the electrical connector (9), and a third sealing ring is provided in the third sealing groove (12). The third sealing ring is used to seal the blind hole (37).

3. The coaxial integrated servo motor pump with integrated drive control function according to claim 1, characterized in that: The cooling oil channel (34) includes a cooling oil groove (39), a center hole (26), and a low-pressure oil drain hole (30). The cooling oil groove (39) extends from one end of the motor pump housing (7) close to the plunger pump assembly (5) to the inner wall of the second cavity (72) away from the plunger pump assembly (5). The center hole (26) extends through the axial position of the rotating shaft (25), and the low-pressure oil drain hole (30) extends through the distribution plate (29).

4. The coaxial servo motor pump with integrated drive control function according to claim 3, characterized in that: A plurality of cooling oil grooves (39) are provided in the motor pump housing (7), and the plurality of cooling oil grooves (39) are evenly distributed with the rotating shaft (25) as the axis.

5. The coaxial servo motor pump with integrated drive and control functions according to claim 4, characterized in that: The motor pump housing (7) is provided with a first annular groove (41), the first annular groove being located at one end of the motor pump housing (7) close to the plunger pump assembly (5), the first annular groove being connected to a plurality of cooling oil grooves (39), and the motor pump housing (7) being provided with a cold oil inlet (32) at one end close to the plunger pump assembly (5), the cold oil inlet (32) being connected to the cooling oil grooves (39).

6. The coaxial integrated servo motor pump with integrated drive control function according to claim 3, characterized in that: The motor pump housing (7) is provided with a second annular groove (42), which is located at one end of the motor pump housing (7) away from the plunger pump assembly (5), and the second annular groove (42) is connected to the plurality of cooling oil grooves (39) and the inner wall of the second cavity (72).

7. The coaxial servo motor pump with integrated drive control function according to claim 1, characterized in that: A plurality of heat dissipation grooves (33) for dissipating heat are provided on the outer circumference of the motor pump housing (7).

8. The coaxial servo motor pump with integrated drive and control functions according to claim 1, characterized in that: A cooling fan (15) is installed on the side of the controller housing (16) facing away from the motor pump housing (7).

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