Internal meshing gear type electro-hydraulic pump

Abstract

The invention discloses an internal meshing gear type electro-hydraulic pump. The internal meshing gear type electro-hydraulic pump comprises a shell, an internal meshing gear set and a cover plate. An oil inlet is formed in the surface of the shell; the internal meshing gear set is arranged in the shell; the internal meshing gear set comprises a motor stator iron core, a gear ring, a gear, a crescent plate and a gear shaft. The gear is fixed on the outer ring of the gear shaft; the crescent plate is located on the inner ring of the gear ring, and the gear ring is arranged outside the gear in a sleeving mode and partially meshed with the gear. The motor stator core is sleeved outside the gear ring; a plurality of permanent magnets are embedded in the outer circumferential surface of the gear ring; the cover plates are arranged at the two ends of the shell, and an oil outlet is formed in one cover plate. An oil inlet channel communicated with the oil inlet and an oil outlet channel communicated with the oil outlet are arranged in the shell; and a low-pressure oil suction area communicated with the oil inlet channel and a high-pressure oil discharge area communicated with the oil outlet channel are respectively formed in a meshing area of the gear and the gear ring. The electro-hydraulic pump is small in occupied space, high in integration and capable of meeting the requirement for flow.

Description

Technical Field

[0001] The present invention relates to the technical field of gear pumps, and more particularly to an internal meshing gear type electro-hydraulic pump. Background Art

[0002] Internal gear pumps can be divided into three categories according to the tooth shape: involute internal gear pumps, linear conjugate internal gear pumps and cycloid gear pumps. These three gear pumps with different tooth shapes are composed of a pump housing and an internal gear. The pump housing is designed with a gear installation space, as well as oil inlet and outlet channels connected to the gear installation space. The internal gear assembly is installed in the gear installation space of the pump housing, including a shaft, an inner rotor and an outer rotor. The inner rotor is fixed to the shaft and meshes with the outer rotor to form a pair of internal gears (the inner rotor is equivalent to the outer gear, and its outer contour constitutes the tooth shape of the inner rotor; the outer rotor is usually an integral internal gear ring, and its inner contour forms the tooth shape of the outer rotor, and the two mesh with each other). During operation, the meshing between the inner rotor and the outer rotor forms two areas: a low-pressure area connected to the oil inlet channel for sucking liquid; and a high-pressure area connected to the oil outlet channel for discharging liquid.

[0003] At present, about 70% of the power sources used in lubrication systems use gear pumps. The working principles of internal gear pumps and external gear pumps are basically the same, both of which use gear meshing to generate volume changes to absorb and discharge oil. However, the internal gear pump has a compact structure and small size, and the structural form of the contact between the external gear and the inner gear ring makes its contact point longer, so it has a better sealing effect, a larger suction and discharge pressure angle, and thus has lower noise, smaller flow pulsation and better oil absorption capacity.

[0004] The traditional lubrication power source uses a motor + coupling + gear pump, which also has some problems during use: 1. Due to the inevitable errors in the assembly process, the motor shaft and the gear shaft are eccentric, which will cause vibration and accelerated wear and leakage at the contact pair, increasing the maintenance cost. 2. The lubrication power unit is placed on the wind turbine. Due to the limitation of the installation space, its installation size is also subject to many restrictions. 3. Unlike pure water and hydraulic oil, grease has unique rheological properties, and the flow field changes of grease flow in the end face gap of the internal meshing gear pump are more complicated; the traditional lubrication system has independent lubrication states for each lubrication point, some moving pairs are grease lubricated, and some are oil bath lubricated. With the long-term continuous operation of the fan, the lubrication state is different, which has a certain impact on the basic performance of the wind power generation system. The lack of lubrication in some key parts may even cause major safety accidents. After adopting the integrated thin oil lubrication system, the traditional internal gear pump can no longer meet the flow requirements of the integrated lubrication system, and the noise and vibration generated are relatively large, and the displacement of the pump is not easy to control. Therefore, the structural dimensions, flow requirements, maintenance and adaptability of the existing internal gear pump to the integrated thin oil lubrication system cannot meet the requirements.

[0005] Therefore, it is an urgent problem for those skilled in the art to develop an internal gear type electro-hydraulic pump that occupies a small space, has high integration, and can meet flow requirements. Summary of the invention

[0006] In view of this, the present invention provides an internal gear type electro-hydraulic pump which occupies a small space, has high integration and can meet flow requirements.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] An internal gear type electro-hydraulic pump, comprising:

[0009] A housing, wherein an oil inlet is provided on a surface of the housing;

[0010] An internal meshing gear set, the internal meshing gear set is arranged inside the housing; the internal meshing gear set comprises: a motor stator core, a gear ring, a gear, a crescent plate and a gear shaft; the gear is fixed to the outer ring of the gear shaft; the crescent plate is located at the inner ring of the gear ring, the gear ring is sleeved on the outside of the gear and partially meshed with the gear; the motor stator core is sleeved on the outside of the gear ring; a plurality of permanent magnets are embedded on the outer circumferential surface of the gear ring;

[0011] A cover plate is arranged at both ends of the shell, and one of the cover plates is provided with an oil outlet; an oil inlet channel connected to the oil inlet is provided in the shell, and an oil outlet channel connected to the oil outlet is also provided; the meshing area of ​​the gear and the gear ring respectively forms a low-pressure oil suction area connected to the oil inlet channel and a high-pressure oil discharge area connected to the oil outlet channel.

[0012] The beneficial effect of adopting the above technical solution is that in the present invention, the ring gear and the permanent magnet are integrated into one as the rotor of the motor. When the stator core of the motor is energized, the stator core of the motor and the permanent magnet interact with each other to generate a rotational force, which drives the ring gear to rotate, and the ring gear drives the gear to rotate, thereby realizing the suction and discharge of oil; in the present invention, the rotor of the pump body and the motor rotor are combined into one, which greatly simplifies the structure and reduces the installation space.

[0013] Preferably, both ends of the gear are provided with a distribution plate, the distribution plate is sleeved on the outside of the gear shaft, and the distribution plate is provided with an oil suction port connected to the low-pressure oil suction area and an oil discharge port connected to the high-pressure oil discharge area. The distribution plate can achieve isolation of the low-pressure oil suction area and the high-pressure oil discharge area.

[0014] Preferably, the position of the distribution plate corresponding to the crescent plate is provided with a limiting groove, and the end of the crescent plate is placed in the limiting groove. The distribution plate fixes the position of the crescent plate through the limiting groove.

[0015] Preferably, the housing comprises: an end housing and an intermediate housing, the two end housings are symmetrically arranged on both sides of the intermediate housing; screws are passed through the intermediate housing and the two end housings and fixed with nuts. The screws can not only realize the connection between the end housing and the intermediate housing, but also facilitate the adjustment of the positions of the three housings.

[0016] Preferably, the oil inlet is located on the outer circumferential surface of the intermediate shell, and the oil inlet passages in the two end shells are both connected to the oil inlet, and respectively transport the oil to the oil suction ports of the two distribution plates.

[0017] Preferably, an installation step is provided on the outer circumferential surface of the cover plate near one end of the gear ring, a sleeve is sleeved on the installation step, and the sleeve is fixedly connected to the gear ring. The sleeve can be connected to the gear ring to ensure that it is more stable during operation.

[0018] Preferably, a rolling bearing is sleeved on the outside of the sleeve, and the rolling bearing is connected to the inner wall of the end shell. The rolling bearing can support the sleeve and the gear ring.

[0019] Preferably, sliding bearings are provided at both ends of the gear shaft, and the sliding bearings are connected to the inner wall of the cover plate. The sliding bearings can support the gear shaft.

[0020] Preferably, a limiting step is provided at the end surface of the open end of the end shell, the end of the cover plate is engaged with the limiting step, and an elastic gasket is provided between the limiting step and the cover plate. The elastic gasket can adjust the axial position of the cover plate.

[0021] Preferably, sealing rings are provided at the contact portion between the cover plate and the inner wall of the end shell, at the contact portion between the sleeve and the outer circumferential surface of the distribution plate, and at the contact portion between the outer circumferential surface of the distribution plate and the gear shaft.

[0022] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an internal gear type electro-hydraulic pump, which has the following beneficial effects:

[0023] (1) In the present invention, a permanent magnet is embedded in the outer surface of the gear ring to form the rotor of the electric hydraulic pump and serve as the driving wheel, and the gear serves as the driven wheel. The hydraulic pump rotor and the motor rotor are combined into one, so that the structure is highly simplified;

[0024] (2) Oil channels are set in the middle casing and the end casing. By rationally designing the oil channel position, the oil flows through the motor stator core when entering the pump body, thereby taking away some heat, improving the thermal stability of the equipment, reducing heat loss, and improving work efficiency;

[0025] (3) The displacement of the gear pump is increased by increasing the tooth thickness, and the reliability of the electro-hydraulic pump can be improved at the same time; by changing the motor speed, the problem of difficult displacement change of the traditional gear pump is overcome, making it convenient to adopt different lubrication strategies for different working conditions;

[0026] (4) The external leakage of the lubrication system is converted into internal leakage by using the motor and the gear pump to share a common housing, and then recovered through the internal flow channel of the electro-hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of the left side of the electro-hydraulic pump provided by the present invention;

[0029] Figure 2 A schematic diagram of the structure of the right side of the electro-hydraulic pump provided by the present invention;

[0030] Figure 3 An exploded view of the structure of the electro-hydraulic pump provided by the present invention;

[0031] Figure 4 A top view of the electro-hydraulic pump provided by the present invention;

[0032] Figure 5 The present invention provides Figure 4 Sectional view at AA in the middle;

[0033] Figure 6 A schematic diagram of the structure of the connection between the internal meshing gear set and the distribution plate provided by the present invention;

[0034] Figure 7 A schematic diagram of the structure of the internal meshing gear set provided by the present invention;

[0035] Figure 8 A schematic diagram of the structure of the internal meshing gear set provided by the present invention;

[0036] Fig. 9 The present invention provides Figure 7 The main view;

[0037] Fig.10 A schematic diagram of the structure of the connection between the stator core and the gear ring of the motor provided by the present invention;

[0038] Fig.11 This is a schematic structural diagram of the connection between the internal meshing gear set and the sleeve provided by the present invention.

[0039] Among them, in the figure,

[0040] 1- housing;

[0041] 11- oil inlet; 12- oil inlet channel; 13- end housing; 14- middle housing;

[0042] 2-internal gear set;

[0043] 21-motor stator core; 22-gear ring; 23-gear; 24-crescent plate; 25-gear shaft; 26-permanent magnet; 27-low-pressure oil suction area; 28-high-pressure oil discharge area;

[0044] 3- Cover plate;

[0045] 31- oil outlet;

[0046] 4-distribution plate;

[0047] 41- oil suction port; 42- oil discharge port;

[0048] 5-screw; 6-sleeve; 7-rolling bearing; 8-sliding bearing; 9-elastic gasket; 10-sealing ring. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The embodiment of the present invention discloses an internal gear type electro-hydraulic pump, comprising:

[0051] The housing 1 has an oil inlet 11 disposed on its surface;

[0052] The internal meshing gear set 2 is arranged inside the housing 1; the internal meshing gear set 2 comprises: a motor stator core 21, a gear ring 22, a gear 23, a crescent plate 24 and a gear shaft 25; the gear 23 is fixed to the outer ring of the gear shaft 25; the crescent plate 24 is located at the inner ring of the gear ring 22, the gear ring 22 is sleeved on the outside of the gear 23, and partially meshed with the gear 23; the motor stator core 21 is sleeved on the outside of the gear ring 22; a plurality of permanent magnets 26 are embedded on the outer circumferential surface of the gear ring 22;

[0053] The cover plates 3 are arranged at both ends of the housing 1, and one of the cover plates 3 is provided with an oil outlet 31; the housing 1 is provided with an oil inlet channel 12 connected to the oil inlet 11, and an oil outlet channel connected to the oil outlet 31; the meshing area of ​​the gear 23 and the gear ring 22 respectively forms a low-pressure oil suction area 27 connected to the oil inlet channel 12 and a high-pressure oil discharge area 28 connected to the oil outlet channel. The cover plate 3 is connected and fixed to the end housing 13 by screws.

[0054] In order to further optimize the above technical solution, the integrated design of the hydraulic pump rotor and the motor rotor not only improves the space utilization, but also eliminates the connecting component of the external extension shaft of the internal gear pump, which completely eliminates the external leakage. The present invention improves the balance of the pump and reduces the vibration during operation through the bilaterally symmetrical arrangement scheme.

[0055] In order to further optimize the above technical solution, a plurality of embedding grooves are evenly opened on the outer circumferential surface of the gear ring 22, and the permanent magnets 26 are embedded in the embedding grooves.

[0056] In order to further optimize the above technical solution, distribution plates 4 are provided at both ends of the gear 23. The distribution plates 4 are sleeved on the outside of the gear shaft 25, and the distribution plates 4 are provided with an oil suction port 41 connected to the low-pressure oil suction area 27 and an oil discharge port 42 connected to the high-pressure oil discharge area 28.

[0057] In order to further optimize the above technical solution, the position of the distribution plate 4 corresponding to the crescent plate 24 is provided with a limiting groove, and the end of the crescent plate 24 is placed in the limiting groove. The distribution plate 4 limits the position of the crescent plate 24 so that it does not rotate with the gear ring 22.

[0058] In order to further optimize the above technical solution, the housing 1 includes: an end housing 13 and an intermediate housing 14, and the two end housings 13 are symmetrically arranged on both sides of the intermediate housing 14; screws 5 are passed through the intermediate housing 14 and the two end housings 13 and fixed with nuts.

[0059] In order to further optimize the above technical solution, the oil inlet 11 is located on the outer circumferential surface of the intermediate shell 14, and the oil inlet channels 12 in the two end shells 13 are connected to the oil inlet 11, and respectively transport the oil to the oil suction ports 41 of the two distribution plates 4.

[0060] In order to further optimize the above technical solution, a mounting step is provided on the outer circumferential surface of one end of the cover plate 3 close to the gear ring 22 , and a sleeve 6 is sleeved on the mounting step, and the sleeve 6 is fixedly connected to the gear ring 22 .

[0061] In order to further optimize the above technical solution, a rolling bearing 7 is sleeved on the outside of the sleeve 6 , and the rolling bearing 7 is connected to the inner wall of the end housing 13 .

[0062] In order to further optimize the above technical solution, sliding bearings 8 are provided at both ends of the gear shaft 25, and the sliding bearings 8 are connected to the inner wall of the cover plate 3. The present invention adopts the method of sliding bearings 8 plus rolling bearings 7 to support the gear ring 22 and the gear shaft 25, thereby improving the bearing capacity and stability of the pump, reducing wear and tear, and extending the maintenance cycle.

[0063] In order to further optimize the above technical solution, a limiting step is provided at the end surface of the open end of the end shell 13 , the end of the cover plate 3 is buckled with the limiting step, and an elastic gasket 9 is provided between the limiting step and the cover plate 3 .

[0064] In order to further optimize the above technical solution, sealing rings 10 are provided at the contact parts between the cover plate 3 and the inner wall of the end shell 13, the contact parts between the sleeve 6 and the outer circumference of the distribution plate 4, and the contact parts between the outer circumference of the distribution plate 4 and the gear shaft 25.

[0065] Working principle:

[0066] When the motor stator core 21 is energized, the motor stator core 21 interacts with the permanent magnet 26 to generate a rotational force, driving the ring gear 22 to rotate, and the ring gear 22 drives the gear 23 and the gear shaft 25 to rotate; the oil enters from the oil inlet 11, and then flows to the oil inlet channels 12 of the two end shells 13 respectively, and then passes through the oil suction port 41 of the distribution plate 4, enters the low-pressure oil suction area 27 at the meshing position of the ring gear 22 and the gear 23, and then through the meshing transmission of the ring gear 22 and the gear 23, the oil is transmitted to the high-pressure oil discharge area 28, and discharged into the oil outlet channel of the end shell 13 through the oil discharge port 42 of the distribution plate 4, and finally discharged through the oil outlet 31.

[0067] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An internal gear type electro-hydraulic pump, characterized in that: include: A housing, wherein an oil inlet is provided on a surface of the housing; An internal meshing gear set, wherein the internal meshing gear set is arranged inside the housing; The internal meshing gear set comprises: a motor stator core, a gear ring, a gear, a crescent plate and a gear shaft; the gear is fixed to the outer ring of the gear shaft; the crescent plate is located at the inner ring of the gear ring, the gear ring is sleeved on the outside of the gear and partially meshed with the gear; the motor stator core is sleeved on the outside of the gear ring; a plurality of permanent magnets are embedded on the outer circumferential surface of the gear ring; A cover plate is arranged at both ends of the shell, and one of the cover plates is provided with an oil outlet; an oil inlet channel connected to the oil inlet is provided in the shell, and an oil outlet channel connected to the oil outlet is also provided; the meshing area of ​​the gear and the gear ring respectively forms a low-pressure oil suction area connected to the oil inlet channel and a high-pressure oil discharge area connected to the oil outlet channel.

2. An internal gear type electro-hydraulic pump according to claim 1, characterized in that: Both ends of the gear are provided with distribution plates, the distribution plates are sleeved on the outside of the gear shaft, and the distribution plates are provided with an oil suction port connected to a low-pressure oil suction area and an oil discharge port connected to a high-pressure oil discharge area.

3. An internal gear type electro-hydraulic pump according to claim 2, characterized in that: A limiting groove is provided at a position corresponding to the distribution plate and the crescent plate, and the end of the crescent plate is placed in the limiting groove.

4. The internal gear type electro-hydraulic pump according to claim 2, characterized in that: The shell comprises: an end shell and an intermediate shell, wherein the two end shells are symmetrically arranged on both sides of the intermediate shell; screws are passed through the intermediate shell and the two end shells and fixed with nuts.

5. An internal gear type electro-hydraulic pump according to claim 4, characterized in that: The oil inlet is located on the outer circumferential surface of the intermediate shell, and the oil inlet passages in the two end shells are both connected to the oil inlet and respectively transport the oil to the oil suction ports of the two distribution plates.

6. The internal gear type electro-hydraulic pump according to claim 4, characterized in that: An installation step is arranged on the outer circumferential surface of one end of the cover plate close to the gear ring, a sleeve is sleeved on the installation step, and the sleeve is fixedly connected to the gear ring.

7. An internal gear type electro-hydraulic pump according to claim 6, characterized in that: A rolling bearing is sleeved on the outside of the sleeve, and the rolling bearing is connected to the inner wall of the end shell.

8. The internal gear type electro-hydraulic pump according to claim 1, characterized in that: Sliding bearings are arranged at both ends of the gear shaft, and the sliding bearings are connected to the inner wall of the cover plate.

9. The internal gear type electro-hydraulic pump according to claim 4, characterized in that: A limiting step is arranged at the end surface of the open end of the end shell, the end of the cover plate is buckled with the limiting step, and an elastic gasket is arranged between the limiting step and the cover plate.

10. The internal gear type electro-hydraulic pump according to claim 6, characterized in that: The contact portion between the cover plate and the inner wall of the end shell, the contact portion between the sleeve and the outer circumferential surface of the distribution plate, and the contact portion between the outer circumferential surface of the distribution plate and the gear shaft are all provided with sealing rings.

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