Gear pump with built-in permanent magnet motor winding and internal gearing type gear pump

Abstract

The utility model relates to a gear pump with a built-in permanent magnet motor winding, which comprises a pump body, a pair of gears is arranged in the pump body, the gears are meshed with each other, the gears comprise a first gear and a second gear, the first gear and / or the second gear are / is provided with a mounting groove, the permanent magnet motor winding is mounted in the mounting groove, and the permanent magnet motor winding is arranged in the permanent magnet motor winding. The permanent magnet motor winding comprises a shaft body, a bearing, a stator core, a plurality of stator windings and a plurality of permanent magnets, the shaft body penetrates through the mounting groove and is fixed to the pump body, the first gear and / or the second gear are / is connected with the shaft body in a matched mode through the bearing, and the permanent magnets are tightly attached to the inner wall of the mounting groove. The stator windings are wound on the stator iron core, the shaft body is matched with the stator iron core to be installed in the installation groove, and the permanent magnets are located on the periphery of the stator windings.

Description

Technical Field

[0001] The utility model relates to the technical field of motor pumps, in particular to a gear pump with built-in permanent magnet motor windings and an internal meshing gear pump. Background Art

[0002] An electric gear pump source is usually composed of two devices, a servo motor and an oil pump. The servo motor and the oil pump are connected by a transmission pair, such as an indirect connection transmission using a coupling, or a direct connection transmission using an internal and external spline, or a better connection transmission. For example, Chinese patent publication CN114962252A discloses an electric gear pump, including a motor and a pump body distributed from left to right, a flange is arranged between the motor and the pump body, the motor includes a shell with an opening at the right end, a stator and a rotor rotating with the stator are arranged in the shell, the pump body includes a gear cylinder with an opening at the left end, an inner gear ring and a gear shaft meshing with the inner gear ring are arranged in the gear cylinder, the right end of the shell is fixedly connected to the left end of the gear cylinder through the flange, one end of the rotor extends into the inner hole of the flange and is sealed with the inner hole of the flange through a seal, the rotor is rotatably matched with the inner hole of the flange, one end of the gear shaft extends into the inner hole of the flange and is fixedly connected to one end of the rotor, an oil outlet hole communicating with the inside of the gear cylinder is arranged on the outer side of the gear cylinder, and an oil suction hole communicating with the inside of the gear cylinder is arranged on the outer side of the flange. However, when the pump body is connected to the motor, the pump body and the motor need to be coaxial to operate normally, so it takes time and cost to test and assemble the coaxial pairing, which reduces production efficiency. At the same time, the motor is external to the pump body, which increases the use area of the pump body, making it inconvenient to operate in a narrow location, which has certain limitations. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a gear pump with built-in permanent magnet motor windings.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: the utility model relates to a gear pump with a built-in permanent magnet motor winding, including a pump body, a pair of mutually meshing first gears and second gears are arranged inside the pump body, the first gear and the second gear are provided with a mounting groove with one end open, and a permanent magnet motor winding is installed in the mounting groove, wherein the permanent magnet motor winding includes a shaft body, a bearing, a stator, and a plurality of permanent magnets, the shaft body is fixedly installed in the casing of the pump body, a pair of the bearings are installed at both ends of the shaft body, the outer side of the shaft body is sleeved with a stator, a plurality of permanent magnets are arranged on the outer side of the stator, and the plurality of permanent magnets are closely attached to the inner wall of the mounting groove, and an end cover is arranged on the opening of the mounting groove. The stator of the utility model is electrically connected to a built-in power supply (such as a button battery), or the stator is electrically connected to an external power supply, and a wiring pipeline is provided in the shaft body, and the power line electrically connects the stator to the external power supply through the pipeline.

[0005] Preferably, the stator includes a stator core, and a stator winding is fixedly embedded in the core slots of the stator core.

[0006] Preferably, the stator windings in the first gear and the second gear can be connected in parallel or in series with each other.

[0007] Preferably, the shaft body includes a shaft top, an assembly part, and a shaft tail connected in sequence. The diameter of the assembly part is larger than that of the shaft top and the shaft tail, and the stator core is sleeved outside the assembly part.

[0008] Preferably, the casing of the pump body includes a front end cover and a rear end cover. The front end cover is provided with an opening. The shaft body is provided with a shaft hole and a wire hole. The opening is located outside the shaft hole, and the power line passes through the shaft hole and the wire hole in sequence and is electrically connected to the stator winding of the stator.

[0009] Preferably, the end cover is provided with a first bearing seat which is sleeved on the shaft top. The first gear and the second gear are provided with a second bearing seat at the other end of the opening, and the second bearing seat is sleeved on the shaft tail. A pair of bearings are respectively sleeved outside the first bearing seat and the second bearing seat, and the first gear and the second gear are rotatably connected to the shaft body through the bearings.

[0010] Preferably, sealing rings are respectively provided at the junction of the first bearing seat and the shaft top and at the junction where the second bearing seat is sleeved on the shaft tail.

[0011] Preferably, the pump body is an external meshing gear pump, or a spiral gear pump, or an involute gear pump, or a double-suction impeller gear pump, or an external hybrid gear pump.

[0012] An internal meshing gear pump with an internal permanent magnet motor winding includes a pump body. The pump body is an internal meshing gear pump body. A first gear is provided in the casing of the pump body. A second gear is rotatably installed on the inner wall of the casing of the pump body. The first gear is a spur gear structure, and the second gear is a ring gear structure. The first gear is smaller than the second gear and is located inside the second gear. The first gear and the second gear are connected by internal meshing gear transmission. A permanent magnet motor winding is provided in the first gear. The permanent magnet motor winding includes a shaft body, bearings, a stator, and a plurality of permanent magnets. The shaft body is fixedly installed in the casing of the pump body. A pair of bearings are installed at both ends of the shaft body. A stator is sleeved outside the shaft body. A plurality of permanent magnets are arranged on the outer circumference of the stator. A plurality of the permanent magnets are closely attached to the inner wall of the installation groove, and an end cover is provided at the opening of the installation groove.

[0013] Preferably, a sealing member is further provided inside the pump body. The sealing member is in a crescent shape and is arranged at the non-meshing part of the first gear and the second gear.

[0014] The beneficial effects of the present utility model are as follows: The present utility model relates to a gear pump with an internal permanent magnet motor winding. In the present utility model, the gear inside the pump body is used as the rotor of the permanent magnet motor winding, and the permanent magnet motor winding is arranged inside the gear. The permanent magnet is closely attached to the inner wall of the installation groove, and the shaft body is installed in the installation groove in cooperation with the stator. A magnetic field is generated through the interaction between the permanent magnet and the stator winding, thereby generating torque to make the gear rotate, so as to realize the suction and discharge of the oil fluid. In the present utility model, the requirement for coaxial pairing between the permanent magnet motor winding and the gear during assembly is reduced, and the production efficiency is improved. By directly arranging the permanent magnet motor winding inside the gear, the overall structure of the product is more compact, and at the same time, the space occupied by the permanent magnet motor winding is also reduced, meeting the use requirements of the product for narrow spaces. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall internal structure of Embodiment 1 of the present utility model.

[0016] Figure 2 It is a schematic diagram of the exploded structure of Embodiment 1 of the present utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the shaft body of Embodiment 1 of the present utility model.

[0018] Figure 4 It is a schematic diagram of the internal structure of the permanent magnet motor winding of Embodiment 1 of the present utility model.

[0019] Figure 5 It is a schematic diagram of the bearing installation structure of Embodiment 1 of the present utility model.

[0020] Figure 6 It is a schematic diagram of the cooperation between the first gear and the second gear of Embodiment 1 of the present utility model.

[0021] Figure 7 It is a schematic diagram of the installation structure of the front end cover and the rear end cover of Embodiment 1 of the present utility model.

[0022] Figure 8 It is a schematic diagram of the internal structure of Embodiment 2 of the present utility model.

[0023] Figure 9 It is a schematic diagram of the exploded structure of Embodiment 2 of the present utility model.

[0024] Figure 10 It is a schematic diagram of the shaft body structure of Embodiment 2 of the present utility model.

[0025] Figure 11 It is a schematic diagram of the assembly structure of the permanent magnet motor winding of Embodiment 2 of the present utility model.

[0026] Figure 12It is a schematic diagram of the bearing assembly structure in the second embodiment of the present utility model.

[0027] Reference numerals

[0028] 1. Pump body; 11. Oil suction pipeline; 12. Oil outlet pipeline; 13. First groove; 14. Second groove; 15. Front end cover; 151. Opening; 16. Rear end cover; 2. First gear; 21. Installation groove; 22. Second bearing seat; 3. Second gear; 4. Permanent magnet motor winding; 41. Shaft body; 411. Shaft top; 412. Assembly part; 4121. First bearing installation position; 4122. Second bearing installation position; 413. Shaft tail; 414. Shaft hole; 415. Wire hole; 42. Stator core; 43. Stator winding; 44. Permanent magnet; 45. Bearing; 46. Power line; 47. Sealing ring; 48. End cover; 481. First bearing seat; 5. Sealing element. Detailed implementation manners

[0029] Please refer to Figures 1-12 As shown, the present utility model relates to a gear pump with an internal permanent magnet motor winding, including a pump body 1 and a pair of gears. The gears are arranged inside the pump body 1, and the gears mesh with each other. The gears are provided with installation grooves 21, and a permanent magnet motor winding 4 is installed in the installation grooves 21. Among them, the permanent magnet motor winding 4 includes a shaft body 41, a bearing 45, a stator, and a plurality of permanent magnets 44. In the present utility model, the gears are the rotors of the permanent magnet motor winding 4. The shaft body 41 passes through the installation groove 21 and is fixed to the pump body 1. The gears are connected to the shaft body 41 through the bearing 45. A stator is sleeved outside the shaft body 41, and a plurality of permanent magnets 44 are arranged on the outer circumference of the stator. The plurality of permanent magnets 44 are closely attached to the inner wall of the installation groove 21.

[0030] Furthermore, the stator includes a stator core 42 and a stator winding 43 fixedly embedded in the core slots of the stator core 42. The shaft body 41 is installed in the installation groove 21 in cooperation with the stator core 42. The permanent magnets 44 are located on the periphery of the stator winding 43. The permanent magnets 44 interact with the stator winding 43 to generate torque to rotate the gears.

[0031] Embodiment 1:

[0032] In the first embodiment, the pump body 1 includes a front end cover 15, a rear end cover 16, an oil suction pipeline 11, and an oil discharge pipeline 12. The rear end cover 16 is covered on the front end cover 15. The oil suction pipeline 11 and the oil discharge pipeline 12 are respectively arranged on the upper and lower surfaces of the pump body 1, and the oil suction pipeline 11 and the oil discharge pipeline 12 communicate with the inside of the pump body 1. In this embodiment, a pair of gears are arranged inside the pump body 1, namely a first gear 2 and a second gear 3, and the first gear 2 and the second gear 3 are meshed and connected. In the first embodiment, the oil suction pipeline 11 and the oil discharge pipeline 12 are located between the first gear 2 and the second gear 3. Oil enters the inside of the pump body 1 from the oil suction pipeline 11. Under the meshing rotation of the first gear 2 and the second gear 3, the teeth of the first gear 2 and the second gear 3 are continuously meshed and disengaged. Under the interaction force of the first gear 2 and the second gear 3, the pump body 1 realizes the suction and discharge of oil.

[0033] Further, installation grooves 21 are arranged inside the first gear 2 and the second gear 3, and permanent magnet motor windings 4 are respectively arranged inside the installation grooves 21 of the first gear 2 and the second gear 3. By respectively driving the meshed first gear 2 and second gear 3 through the two permanent magnet motor windings 4, the rotation speeds and torques of the two permanent magnet motor windings 4 can be independently controlled, and the flow rate and pressure can be accurately controlled, improving the precision and stability of transmission, so as to be able to adapt to different working requirements.

[0034] In the first embodiment, the permanent magnet motor winding 4 further includes a bearing 45, a power line 46, a sealing ring 47, and an end cover 48. The shaft body 41 includes a shaft top 411, an assembly part 412, and a shaft tail 413 connected in sequence. The diameter of the assembly part 412 is larger than that of the shaft top 411 and the shaft tail 413, and the stator core 42 is sleeved outside the assembly part 412.

[0035] In this embodiment, the front end cover 15 is provided with an opening 151, the shaft body 41 is provided with a shaft hole 414 and a wire hole 415, the opening 151 is located outside the shaft hole 414, and the power line 46 sequentially passes through the shaft hole 414 and the wire hole 415 and is electrically connected to the stator winding 43 of the stator. The power line 46 provides current to be introduced into the stator winding 43, so that a magnetic field is generated on the permanent magnet 44 and the stator winding 43, thereby driving the gear to rotate by the permanent magnet 44. Among them, the stator windings 43 in the first gear 2 and the second gear 3 can be connected in parallel or in series with each other.

[0036] A sealing ring 47 is arranged at the junction of the shaft top 411 and the first bearing seat 481, and the sealing ring 47 prevents oil from entering the permanent magnet motor winding 4;

[0037] The end cover 48 is installed on the opening of the front end cover 15. The end cover 48 is provided with a first bearing seat 481. The top of the shaft 411 passes through the first bearing seat 481, and the bearing 45 is sleeved on the first bearing seat 481.

[0038] The bottoms of the first gear 2 and the second gear 3 are provided with a second bearing seat 22. The bearing 45 is sleeved on the second bearing seat 22. The tail of the shaft 413 passes through the second bearing seat 22 and is exposed outside the first gear 2 or the second gear 3.

[0039] The tail of the shaft 413 is fixed inside the pump body 1. A sealing ring 47 is provided at the junction of the tail of the shaft 413 and the first gear 2 or the second gear 3. The sealing ring 47 prevents the oil from entering the permanent magnet motor winding 4.

[0040] Embodiment 2:

[0041] The difference between this Embodiment 2 and Embodiment 1 is that in Embodiment 2, the pump body 1 includes an oil suction pipe 11 and an oil discharge pipe 12. Inside the pump body 1, there are a first groove 13 and a second groove 14. The oil suction pipe 11 communicates with the first groove 13, and the oil discharge pipe 12 communicates with the second groove 14. The oil suction pipe 11 and the oil discharge pipe 12 communicate with the inside of the pump body 1 through the first groove 13 and the second groove 14 respectively.

[0042] Furthermore, in Embodiment 2, there are a pair of gears inside the pump body 1, which are the first gear 2 and the second gear 3 respectively. The first gear 2 is of a spur gear structure, and the second gear 3 is of a ring gear structure. The first gear 2 is smaller than the second gear 3. Further, the inner shape of the pump body 1 matches the outer shape of the second gear 3. The second gear 3 is rotatably installed inside the pump body 1, and the first gear 2 is fixedly installed inside the pump body 1. The first gear 2 and the second gear 3 are connected by internal gear transmission. There is also a sealing member 5 inside the pump body 1. The sealing member 5 is in a crescent shape and is arranged at the non-engaged part of the first gear 2 and the second gear 3. The oil enters the inside of the pump body 1 from the oil suction pipe 11. Under the internal gear transmission of the first gear 2 and the second gear 3, the internal space changes continuously. Under the mutual action of the first gear 2 and the second gear 3, the pump body 1 realizes the suction and discharge of the oil.

[0043] Further, in the second embodiment, an installation groove 21 is provided inside the first gear 2, and the permanent magnet motor winding 4 is disposed in the installation groove 21. The permanent magnet motor winding 4 further includes a pair of bearings 45, power lines 46, a sealing ring 47, and an end cover 48. The shaft body 41 includes a shaft top portion 411, an assembly portion 412, and a shaft tail portion 413 that are connected in sequence. The shaft body 41 passes through the stator core 42, and the stator core 42 is fixed to the assembly portion 412. First bearing 45 installation positions 4121 and second bearing 45 installation positions 4122 are provided at both ends of the assembly portion 412. The bearings 45 are respectively disposed in the first bearing 45 installation position 4121 and the second bearing 45 installation position 4122. The sealing ring 47 is installed at the junction of the bearing 45 and the shaft body 41. The end cover 48 is installed on the shaft top portion 411, and the shaft top portion 411 passes through the end cover 48 and is connected to the power line 46. The shaft tail portion 413 passes through the installation groove 21, and the shaft tail portion 413 is fixedly connected to the inside of the pump body 1.

[0044] The present utility model relates to a gear pump with an internal permanent magnet motor winding. In the present utility model, the gear inside the pump body 1 is used as the rotor of the permanent magnet motor winding 4, and the permanent magnet motor winding 4 is disposed inside the gear. The permanent magnet 44 is closely attached to the inner wall of the installation groove 21. The shaft body 41 is installed in the installation groove 21 in cooperation with the stator. A magnetic field is generated through the interaction between the permanent magnet 44 and the stator winding 43, thereby generating a torque to cause the gear to rotate, so as to realize the suction and discharge of the oil fluid. In the present utility model, the requirement for coaxial pairing between the permanent magnet motor winding 4 and the gear during assembly is reduced, and the production efficiency is improved. By directly disposing the permanent magnet motor winding 4 inside the gear, the overall structure of the product is made more compact, and at the same time, the space occupied by the permanent magnet motor winding 4 is also reduced, meeting the usage requirements of the product for a narrow space.

[0045] The above embodiments are merely descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A gear pump with an internally permanent magnet motor winding, comprising a pump body, wherein a pair of first and second gears that mesh with each other are arranged inside the pump body, and it is characterized in that: The first gear and the second gear are provided with mounting grooves having an opening at one end, and a permanent magnet motor winding is installed in the mounting grooves. Among them, the permanent magnet motor winding includes a shaft body, bearings, a stator, and a plurality of permanent magnets. The shaft body is fixedly installed in the housing of the pump body. A pair of the bearings are installed at both ends of the shaft body. A stator is sleeved outside the shaft body. A plurality of permanent magnets are arranged on the outer circumference of the stator. The plurality of permanent magnets are closely attached to the inner wall of the mounting groove. A end cover is arranged on the opening of the mounting groove.

2. The gear pump with an internally permanent magnet motor winding according to claim 1, characterized in that: The stator includes a stator core, and a stator winding is fixedly embedded in the core slots of the stator core.

3. The gear pump with an internally permanent magnet motor winding according to claim 2, characterized in that: The stator windings in the first gear and the second gear can be connected in parallel or in series with each other.

4. A gear pump with an internally permanent magnet motor winding according to claim 2, characterized in that: The shaft body includes a shaft top, an assembly part, and a shaft tail connected in sequence. The diameter of the assembly part is larger than that of the shaft top and the shaft tail. The stator core is sleeved outside the assembly part.

5. A gear pump with an internally permanent magnet motor winding according to claim 4, characterized in that: The housing of the pump body includes a front end cover and a rear end cover. The front end cover is provided with an opening. The shaft body is provided with a shaft hole and a wire hole. The opening is located outside the shaft hole. The power line sequentially passes through the shaft hole and the wire hole and is electrically connected to the stator winding of the stator.

6. A gear pump with an internally permanent magnet motor winding according to claim 4, characterized in that: The end cover is provided with a first bearing seat, and the first bearing seat is sleeved on the shaft top. The first gear and the second gear are provided with a second bearing seat at the other end of the opening, and the second bearing seat is sleeved on the shaft tail. A pair of the bearings are respectively sleeved outside the first bearing seat and the second bearing seat. The first gear and the second gear are rotationally connected to the shaft body through the bearings.

7. A gear pump with a built-in permanent magnet motor winding according to claim 6, characterized in that: Sealing rings are respectively arranged at the junction of the first bearing seat and the shaft top and at the junction where the second bearing seat is sleeved on the shaft tail.

8. A gear pump with a built-in permanent magnet motor winding according to claim 1, characterized in that: The pump body is an external meshing gear pump or a spiral gear pump or an involute gear pump or a double-suction impeller gear pump or an external mixing gear pump.

9. An internal meshing gear pump with an internal permanent magnet motor winding, characterized in that: It includes a pump body. The pump body is an internal meshing gear pump body. A first gear is arranged in the housing of the pump body. A second gear is rotatably installed on the inner wall of the housing of the pump body. The first gear is a spur gear structure. The second gear is a ring gear structure. The first gear is smaller than the second gear and is located inside the second gear. The first gear and the second gear are connected by internal meshing gear transmission. A permanent magnet motor winding is arranged in the first gear. The permanent magnet motor winding includes a shaft body, bearings, a stator, and a plurality of permanent magnets. The shaft body is fixedly installed in the housing of the pump body. A pair of the bearings are installed at both ends of the shaft body. A stator is sleeved outside the shaft body. A plurality of permanent magnets are arranged on the outer circumference of the stator. The plurality of permanent magnets are closely attached to the inner wall of the mounting groove. A end cover is arranged on the opening of the mounting groove.

10. An internal meshing gear pump with an internally permanent magnet motor winding according to claim 9, characterized in that: A sealing member is further arranged inside the pump body. The sealing member is in a crescent shape and is arranged at the non-meshing part of the first gear and the second gear.

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