CN117759533A - Internal gear pump and external rotor of internal gear pump - Google Patents

Abstract

The invention discloses an improved meshed gear pump and an outer rotor of an internal gear pump, which are used for solving the technical problem of improving the phenomena of pull injury and abrasion between the outer rotor and a pump shell assembly. Comprising the following steps: the pump shell assembly is internally provided with an inner meshing gear assembly installation working cavity, and a liquid inlet channel and a liquid outlet channel which are respectively communicated with the inner meshing gear assembly installation working cavity; the inner meshing gear assembly is assembled in the inner meshing gear assembly installation working cavity and comprises a rotating shaft, an inner rotor and an outer rotor; at least one of the first side end surface and the second side end surface of the outer rotor is provided with a plurality of independent second liquid film grooves which are respectively arranged at intervals along the circumference of the outer rotor, the edge openings of the second liquid film grooves extend to the tooth profile of the outer rotor formed by the inner profile of the outer rotor, and the shape, the size and the arrangement mode of the second liquid film grooves enable the liquid inlet channel and the liquid outlet channel to be not communicated through the second liquid film grooves.

Description

Internal gear pump and external rotor of internal gear pump

Technical Field

The present disclosure relates to a crescent gear pump and a pump body of a crescent gear pump, an outer rotor of a crescent gear pump that can be used in lubrication cooling systems including, but not limited to, wind powered gearboxes.

Background

The existing internal gear pump can be mainly divided into an internal involute gear pump and an internal cycloidal gear pump. The structure of the two internal gear pumps comprises a pump shell component and an internal gear assembly, wherein an internal gear assembly installation working cavity, a liquid inlet channel and a liquid outlet channel which are communicated with the internal gear assembly installation working cavity are arranged in the pump shell component, the internal gear assembly is assembled in the internal gear assembly installation working cavity and comprises a rotating shaft, an inner rotor and an outer rotor, the inner rotor is arranged on the rotating shaft and meshed with the outer rotor to form an internal gear pair (the inner rotor is an inner gear, the outer contour of the inner gear forms an inner rotor tooth profile, the outer rotor is an integral gear ring generally, the inner contour of the integral gear ring forms an outer rotor tooth profile, the inner rotor tooth profile is meshed with the outer rotor tooth profile), and a low-pressure liquid suction area which is correspondingly communicated with the liquid inlet channel and a high-pressure liquid outlet area which is correspondingly communicated with the liquid outlet channel are respectively formed between the inner rotor and the outer rotor during operation of the internal gear pair.

The applicant of the present disclosure encounters the following problems in developing a wind power gearbox lubrication cooling system: at present, the internal gear pump capable of providing lubricating oil driving power for the wind power gear box lubricating and cooling system can usually only work for a long service life under the maximum pumping pressure of about 10bar (namely 1 MPa), but the pumping pressure of the internal gear pump is required to be increased to 25bar (namely 2.5 MPa) according to design requirements, under the relatively extreme use condition, the existing internal gear pump is more likely to cause the phenomena of strain and abrasion between an inner rotor and a pump shell assembly and between an outer rotor and the pump shell assembly, so that the use stability and the service life of the existing internal gear pump can not meet the requirements.

Disclosure of Invention

The present disclosure aims to provide an improved internal gear pump and a pump body of the internal gear pump, so as to solve the technical problems of improving the phenomena of pull injury and abrasion between an inner rotor and a pump shell assembly. It is a further object of the present disclosure to provide an improved internal gear pump and an external rotor for an internal gear pump to address the technical problem of improving the phenomena of pull damage, wear between the external rotor and pump housing assembly.

In a first aspect, there is provided a crescent gear pump comprising: the pump shell assembly is internally provided with an inner meshing gear assembly installation working cavity, and a liquid inlet channel and a liquid outlet channel which are respectively communicated with the inner meshing gear assembly installation working cavity; the inner meshing gear assembly is assembled in the inner meshing gear assembly installation working cavity and comprises a rotating shaft, an inner rotor and an outer rotor; the inner rotor is arranged on the rotating shaft and meshed with the outer rotor to form an inner meshed gear pair, and a low-pressure liquid suction area correspondingly communicated with the liquid inlet channel and a high-pressure liquid discharge area correspondingly communicated with the liquid discharge channel are respectively formed between the inner rotor and the outer rotor when the inner meshed gear pair works; a first liquid film groove is formed in the inner rotor and/or the pump shell component, and a high-pressure drainage channel used for communicating the liquid discharge channel with the first liquid film groove is formed in the pump shell component; the first liquid film groove is defined in a first leakage-proof fit area formed by at least one of a first side end surface and a second side end surface of the inner rotor and the pump shell component in a fit mode, and extends along the surface of the first leakage-proof fit area in an expanding mode.

As technical optimization and/or elaboration of the internal gear pump of the first aspect, the pump housing assembly includes a pump body in which the working chamber, the intake passage and the discharge passage are provided; the bottom of the pump body, which is positioned in the working cavity for installing the ring gear assembly, is provided with a first ring gear assembly axial positioning surface matched with the first side end surface of the ring gear assembly, a first rotating shaft assembly hole matched with the rotating shaft is formed in the center of the first ring gear assembly axial positioning surface, and the outlet of the liquid inlet channel and the inlet of the liquid outlet channel are distributed on the first ring gear assembly axial positioning surface and positioned beside the first rotating shaft assembly hole; the first liquid film groove comprises a first liquid film groove arranged on the first side of the inner rotor in a first anti-leakage matching area formed by matching between the first side end face of the inner rotor and the axial positioning face of the first internal meshing gear assembly, and the high-pressure drainage channel comprises a pump body side high-pressure drainage channel which is arranged on the pump body and is used for communicating the liquid drainage channel with the first liquid film groove on the first side of the inner rotor.

As technical optimization and/or detailing of the crescent gear pump of the first aspect, the pump body side high pressure drainage channel includes a high pressure drainage groove provided on the first crescent gear assembly axial positioning surface to conduct the inlet of the drainage channel with the first liquid film groove on the first side of the inner rotor.

As technical optimization and/or detailing of the internal gear pump of the first aspect, the first liquid film groove on the first side of the inner rotor is integrally formed on the axial positioning surface of the first internal gear assembly.

As a technical optimization and/or detailing of the internal gear pump of the first aspect, the first liquid film groove on the first side of the inner rotor is integrally formed on the first side end surface of the inner rotor.

As a technical optimization and/or elaboration of the internal gear pump of the first aspect, the first liquid film groove of the first side of the inner rotor is partially formed on the axial positioning surface of the first internal gear assembly and the other part is formed on the first side end surface of the inner rotor.

As a technical optimization and/or elaboration of the ring gear pump of the first aspect described above, the pump housing assembly further comprises an end cap member mounted on the pump body and enclosing the ring gear assembly within the pump housing assembly; the inner side of the end cover member is provided with a second inner meshed gear assembly axial positioning surface matched with the second side end surface of the inner meshed gear assembly, and a second rotating shaft assembly hole matched with the rotating shaft is formed in the center of the second inner meshed gear assembly axial positioning surface.

As technical optimization and/or elaboration of the internal gear pump according to the first aspect, the inner rotor is provided with an inner rotor side drainage hole, a first end of the inner rotor side drainage hole is communicated with the first liquid film groove on the first side of the inner rotor, and a second end of the inner rotor side drainage hole is communicated with a fit clearance between the second side end face of the inner rotor and the axial positioning face of the second internal gear assembly.

As a technical optimization and/or detailing of the internal gear pump according to the first aspect, the first liquid film groove is of an annular groove structure, and the position of the inner rotor side drainage hole on the inner rotor is designed to move along the annular direction of the first liquid film groove and is always communicated with the first liquid film groove when the inner rotor rotates.

As technical optimization and/or detailing of the internal gear pump of the first aspect, the number of the inner rotor side drainage holes is two or more.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the end cap member comprises: the reversing component comprises a reversing disc, an inner meshing gear assembly mounting sleeve is arranged on the first side end surface of the reversing disc, a reversing disc side forward rotation stopping structure and a reversing disc side reverse rotation stopping structure are arranged on the second side end surface of the reversing disc, an inner cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the outer wall of the outer rotor, an outer cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the inner wall of the inner meshing gear assembly mounting working cavity, the outer cylindrical surface and the inner cylindrical surface are eccentrically arranged, and when the inner meshing gear assembly is assembled in the inner cylindrical surface, the rotating shaft and the outer cylindrical surface are coaxially arranged; the end cover is sleeved on the reversing member and is detachably connected with the pump body, an end cover side forward rotation stopping structure and an end cover side reverse rotation stopping structure are arranged in the end cover, when the rotating shaft drives the whole inner meshing gear assembly to rotate forward, the inner meshing gear assembly drives the whole reversing disc to rotate forward until the reversing disc side forward rotation stopping structure is contacted with the end cover side forward rotation stopping structure, at the moment, the reversing disc stops rotating, a low-pressure liquid suction area and a high-pressure liquid discharge area formed during forward rotation between the inner rotor and the outer rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel, and when the rotating shaft drives the whole inner meshing gear assembly to rotate reversely, the inner meshing gear assembly drives the whole reversing disc to rotate reversely until the reversing disc side reverse rotation stopping structure is contacted with the end cover side reverse rotation stopping structure, at the moment, and a low-pressure liquid suction area and a high-pressure liquid suction area formed during reverse rotation between the reversing disc and the outer rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel; the first side end surface of the reversing disc forms an axial positioning surface of the second ring gear assembly, and the second rotating shaft assembly Kong Kaishe is arranged at the center of the reversing disc.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect, a bearing is installed in the end cover, and the rotating shaft passes through the second rotating shaft assembly hole and is assembled in the bearing.

As technical optimization and/or elaboration of the internal gear pump according to the first aspect, the pump body is provided with a low-pressure backflow channel, and the low-pressure backflow channel is used for conducting between the hole wall of the first rotating shaft assembly hole and the liquid inlet channel, so that liquid in the fit gap between the first rotating shaft assembly hole and the rotating shaft flows back to the liquid inlet channel.

As a technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the first liquid film groove is of annular groove structure as a whole.

As a technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the first liquid film tank has a main tank circuit and an expansion tank circuit connected and distributed over the main tank circuit.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the expansion tank circuit comprises a shallow groove opened at the edge of the main tank circuit, and a step is formed between the shallow groove and the main tank circuit.

As a technical optimization and/or elaboration of the crescent gear pump of the first aspect, the main channel is an annular groove, and the expansion channels are arranged at intervals on the main channel.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the edge profile of the expansion tank circuit includes an inner edge portion extending along the inner edge of the annular groove, an outer edge portion extending along the outer edge of the annular groove, and transition portions for respectively connecting both ends of the inner edge portion and both ends of the outer edge portion with the annular groove.

As technical optimization and/or elaboration of the internal gear pump according to the first aspect, the inner edge portion is a circular arc line, the outer edge portion is a circular arc line, and the transition portion is a paraboloid line of smooth transition of the circular arc line connected with the transition portion.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, at least one of the inner edge portion and the outer edge portion further has a boss portion thereon.

As a technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the fit between the inner rotor and the pump housing assembly at the first anti-leakage fit region is a clearance fit such that the liquid film in the first liquid film groove is outwardly spread.

As technical optimization and/or elaboration of the crescent gear pump of the first aspect described above, the crescent gear pump is a crescent cycloidal gear pump, and the crescent gear pump is a crescent cycloidal gear pump.

In a second aspect, a pump body of an internal gear pump is provided, including an internal gear assembly installation working cavity, and a liquid inlet channel and a liquid discharge channel which are respectively communicated with the internal gear assembly installation working cavity, the internal gear assembly installation working cavity is used for installing an internal gear assembly, the internal gear assembly includes a rotating shaft, an inner rotor and an outer rotor, the inner rotor is installed on the rotating shaft and meshed with the outer rotor to form an internal gear pair, a low-pressure liquid suction area correspondingly communicated with the liquid inlet channel and a high-pressure liquid discharge area correspondingly communicated with the liquid discharge channel are respectively formed between the inner rotor and the outer rotor when the internal gear pair works, a first internal gear assembly axial positioning surface matched with a first side end surface of the internal gear assembly is arranged at the bottom of the internal gear assembly installation working cavity, a first rotating shaft assembly assembling hole matched with the rotating shaft is formed at the center of the first internal gear assembly axial positioning surface, an outlet of the liquid inlet channel and an inlet of the liquid discharge channel are distributed on the first internal gear assembly axial positioning surface and are correspondingly communicated with a first liquid film expansion preventing groove formed at the first side of the first axial expansion groove, the first liquid film is axially matched with the first side surface of the first liquid film expansion preventing groove is formed at the first side of the inner gear assembly axial positioning surface, the pump body is internally provided with a pump body side high-pressure drainage channel which is used for communicating the liquid drainage channel with the first liquid film groove on the first side of the inner rotor.

As technical optimization and/or detailing of the pump body of the internal gear pump according to the second aspect, the pump body side high-pressure drainage channel includes a high-pressure drainage groove formed on the axial positioning surface of the first internal gear assembly to conduct the inlet of the drainage channel with the first liquid film groove on the first side of the inner rotor.

As technical optimization and/or elaboration of the pump body of the internal gear pump according to the second aspect, a low-pressure backflow channel is formed in the pump body, and the low-pressure backflow channel is used for conducting between the hole wall of the first rotating shaft assembly hole and the liquid inlet channel, so that liquid in the fit gap between the first rotating shaft assembly hole and the rotating shaft flows back to the liquid inlet channel.

As a technical optimization and/or detailing of the pump body of the internal gear pump of the second aspect, the first liquid film groove of the first side of the inner rotor is an annular groove structure as a whole.

As a technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect described above, the inner rotor first side first liquid film groove has a main groove path and an expansion groove path connected and distributed on the main groove path.

As technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect described above, the expansion tank circuit comprises a shallow groove opened at the edge of the main tank circuit, and a step is formed between the shallow groove and the main tank circuit.

As a technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect, the main channel is an annular channel, and the expansion channels are arranged at intervals on the main channel.

As technical optimization and/or elaboration of the pump body of the internal gear pump of the second aspect described above, the edge profile of the expansion tank circuit includes an inner edge portion extending along the inner edge of the annular groove, an outer edge portion extending along the outer edge of the annular groove, and transition portions for connecting both ends of the inner edge portion and both ends of the outer edge portion with the annular groove, respectively.

As technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect described above, the inner edge portion is circular arc-shaped, the outer edge portion is circular arc-shaped, and the transition portion is parabolic-like.

As technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect described above, at least one of the inner edge portion and the outer edge portion further has a boss portion thereon.

As technical optimization and/or elaboration of the pump body of the crescent gear pump of the second aspect described above, the pair of crescent gears is a pair of crescent cycloidal gears, and the crescent gear pump is a crescent cycloidal gear pump.

The pump body of the internal gear pump according to the first aspect and the pump body of the internal gear pump according to the second aspect are based on the same inventive concept, namely, high-pressure liquid in the liquid discharge channel is introduced into the first liquid film groove through the high-pressure drainage channel, and the first liquid film groove is limited in a first leakage-preventing fit area formed by fit between at least one of the first side end surface and the second side end surface of the inner rotor and the pump shell component and extends along the surface of the first leakage-preventing fit area, so that the high-pressure liquid entering the first liquid film groove forms a continuous liquid film pad, and the first side end surface and/or the second side end surface of the inner rotor and the pump shell component are effectively prevented from being damaged by pulling and wearing. Generally speaking, the fit mode between the inner rotor and the pump shell assembly at the first anti-leakage fit area is clearance fit, so that the liquid film in the first liquid film groove is outwards diffused, and therefore, the liquid film pad has the isolation function and the functions of lubricating, washing pollution and taking away friction heat.

In a third aspect, there is provided a crescent gear pump comprising: the pump shell assembly is internally provided with an inner meshing gear assembly installation working cavity, and a liquid inlet channel and a liquid outlet channel which are respectively communicated with the inner meshing gear assembly installation working cavity; the inner meshing gear assembly is assembled in the inner meshing gear assembly installation working cavity and comprises a rotating shaft, an inner rotor and an outer rotor; the inner rotor is arranged on the rotating shaft and meshed with the outer rotor to form an inner meshed gear pair, and a low-pressure liquid suction area correspondingly communicated with the liquid inlet channel and a high-pressure liquid discharge area correspondingly communicated with the liquid discharge channel are respectively formed between the inner rotor and the outer rotor when the inner meshed gear pair works; at least one of the first side end surface and the second side end surface of the outer rotor is provided with a plurality of independent second liquid film grooves which are respectively arranged at intervals along a circle of the outer rotor, edge openings of the second liquid film grooves extend to an outer rotor tooth profile formed by the inner contour of the outer rotor, and the shape, the size and the arrangement mode of the second liquid film grooves enable the liquid inlet channel and the liquid outlet channel to be not communicated through the second liquid film grooves.

As technical optimization and/or elaboration of the internal gear pump of the third aspect, the pump housing assembly includes a pump body in which the working chamber, the intake passage and the discharge passage are all opened; the bottom of the pump body, which is positioned in the working cavity for installing the ring gear assembly, is provided with a first ring gear assembly axial positioning surface matched with the first side end surface of the ring gear assembly, the outlet of the liquid inlet channel and the inlet of the liquid discharge channel are distributed on the first ring gear assembly axial positioning surface, an intermediate baffle is formed between the outlet of the liquid inlet channel and the inlet of the liquid discharge channel, and a first rotating shaft assembly hole matched with the rotating shaft is formed in the intermediate baffle; the second liquid film groove comprises a plurality of independent outer rotor first side second liquid film grooves which are arranged on the first side end surface of the outer rotor and are respectively arranged along the circumference of the outer rotor at intervals, and any second liquid film groove on the first side of the outer rotor cannot completely span a second anti-leakage matching area formed by matching the first side end surface of the outer rotor with the middle partition plate so as to conduct the outlet of the liquid inlet channel with the inlet of the liquid discharge channel.

As a technical optimization and/or elaboration of the ring gear pump of the third aspect described above, the pump housing assembly further comprises an end cap member mounted on the pump body and enclosing the ring gear assembly within the pump housing assembly; the inner side of the end cover member is provided with a second inner meshed gear assembly axial positioning surface matched with the second side end surface of the inner meshed gear assembly, and a second rotating shaft assembly hole matched with the rotating shaft is formed in the center of the second inner meshed gear assembly axial positioning surface.

As technical optimization and/or elaboration of the crescent gear pump of the third aspect described above, the end cap member comprises: the reversing component comprises a reversing disc, an inner meshing gear assembly mounting sleeve is arranged on the first side end surface of the reversing disc, a reversing disc side forward rotation stopping structure and a reversing disc side reverse rotation stopping structure are arranged on the second side end surface of the reversing disc, an inner cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the outer wall of the outer rotor, an outer cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the inner wall of the inner meshing gear assembly mounting working cavity, the outer cylindrical surface and the inner cylindrical surface are eccentrically arranged, and when the inner meshing gear assembly is assembled in the inner cylindrical surface, the rotating shaft and the outer cylindrical surface are coaxially arranged; the end cover is sleeved on the reversing member and is detachably connected with the pump body, an end cover side forward rotation stopping structure and an end cover side reverse rotation stopping structure are arranged in the end cover, when the rotating shaft drives the whole inner meshing gear assembly to rotate forward, the inner meshing gear assembly drives the whole reversing disc to rotate forward until the reversing disc side forward rotation stopping structure is contacted with the end cover side forward rotation stopping structure, at the moment, the reversing disc stops rotating, a low-pressure liquid suction area and a high-pressure liquid discharge area formed during forward rotation between the inner rotor and the outer rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel, and when the rotating shaft drives the whole inner meshing gear assembly to rotate reversely, the inner meshing gear assembly drives the whole reversing disc to rotate reversely until the reversing disc side reverse rotation stopping structure is contacted with the end cover side reverse rotation stopping structure, at the moment, and a low-pressure liquid suction area and a high-pressure liquid suction area formed during reverse rotation between the reversing disc and the outer rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel; the first side end surface of the reversing disc forms an axial positioning surface of the second ring gear assembly, and the second rotating shaft assembly Kong Kaishe is arranged at the center of the reversing disc.

As technical optimization and/or elaboration of the crescent gear pump of the third aspect, a bearing is installed in the end cover, and the rotating shaft passes through the second rotating shaft assembly hole and is assembled in the bearing.

As a technical optimization and/or detailing of the internal gear pump according to the third aspect, the second liquid film groove includes a plurality of outer rotor second side second liquid film grooves which are formed in the second side end surface of the outer rotor and are arranged at intervals along a circumference of the outer rotor.

As a technical optimization and/or detailing of the internal gear pump according to the third aspect, the outer rotor first side second liquid film groove and the outer rotor second side second liquid film groove are completely symmetrical in shape, size and arrangement on both sides of the outer rotor.

As a technical optimization and/or elaboration of the crescent gear pump of the third aspect described above, the second liquid film groove is open on the side of the corresponding root portion of the outer rotor tooth profile and its edge opening extends to the edge of the corresponding root portion.

As a technical optimization and/or elaboration of the crescent gear pump according to the third aspect, the second liquid film grooves are provided on the side face of each root portion of the outer rotor tooth profile in a one-to-one correspondence.

As a technical optimization and/or detailing of the internal gear pump according to the third aspect, the second liquid film groove extends and extends on both sides of the corresponding tooth root portion of the external rotor tooth profile where the second liquid film groove is located, with the corresponding tooth root portion as a center.

As a technical optimization and/or elaboration of the crescent gear pump according to the third aspect, the profile of the tooth root portion is mainly formed by an arc surface, and the arc surface is smoothly transited with an arc surface intersecting with the arc surface on the tooth profile of the outer rotor.

As a technical optimization and/or elaboration of the crescent gear pump according to the third aspect, radial drainage holes are distributed on the outer wall of the outer rotor, and penetrate to the corresponding tooth root part.

In a fourth aspect, there is provided an outer rotor of a crescent gear pump, which is the outer rotor employed in the crescent gear pump of the third aspect described above.

The external rotor of the internal gear pump according to the third aspect and the external rotor of the fourth aspect are provided with a plurality of independent second liquid film grooves which are respectively arranged along the circumference of the external rotor at intervals on at least one of the first side end surface and the second side end surface of the external rotor, the edge openings of the second liquid film grooves extend to the tooth profile of the external rotor formed by the inner contour of the external rotor, the shape, the size and the arrangement of the second liquid film grooves are such that the liquid inlet channel and the liquid outlet channel cannot be communicated through the second liquid film grooves, thus, when part of the tooth profile of the external rotor correspondingly connected with the second liquid film grooves is communicated with the liquid outlet channel along with the rotation of the external rotor, the part of the second liquid film grooves are filled with high-pressure liquid from the liquid outlet channel, and as the second liquid film grooves are independently arranged, and once the second liquid film grooves are filled with high-pressure liquid from the liquid outlet channel, the high-pressure liquid film grooves in the liquid outlet channel and the liquid outlet channel cannot be communicated with the liquid pump shell only when the second liquid grooves are completely not communicated with the liquid outlet channel along with the rotation of the external rotor, and the high-pressure liquid film pads in the liquid pump shell can be prevented from being fully worn out from the liquid inlet channel and the liquid outlet channel.

The disclosure is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice.

Drawings

The accompanying drawings, which form a part hereof, are included to provide an understanding of the disclosure, and are incorporated in and constitute a part of this disclosure, but are not to be construed as unduly limiting the disclosure.

Fig. 1 is an external structural view of a crescent gear pump according to an embodiment of the present disclosure.

Fig. 2 is an external structural view of the internal gear pump of fig. 1 at another angle.

Fig. 3 is an exploded view of the internal gear pump of fig. 1.

FIG. 4 is an assembled view of the pump body, ring gear assembly and reversing disc of the ring gear pump of FIG. 1.

FIG. 5 is an assembly view of the ring gear assembly and reversing disc of the ring gear pump of FIG. 1.

Fig. 6 is a cross-sectional view of the end cap of the crescent gear pump of fig. 1 in a forward rotation.

Fig. 7 is a cross-sectional view of the end cap of the crescent gear pump of fig. 1 in reverse rotation.

FIG. 8 is a diagram of the relationship between the assembly of the ring gear assembly and the reversing disc after the ring gear pump of FIG. 1 is rotated in the forward direction and the reversing disc is stopped.

FIG. 9 is a diagram showing the relationship between the assembly of the ring gear assembly and the reversing disc after the ring gear pump of FIG. 1 rotates in a reverse direction and the reversing disc is stopped from rotating.

Fig. 10 is a diagram showing the construction of a pump body of the internal gear pump shown in fig. 1.

Fig. 11 is an enlarged view of a first liquid film groove portion of the first side of the inner rotor of fig. 10.

Fig. 12 is a diagram showing the assembled positional relationship between the inner rotor and the pump body of the internal gear pump shown in fig. 1.

FIG. 13 is a cross-sectional view of the ring gear assembly (with the rotary shaft removed) of the ring gear pump of FIG. 1.

Fig. 14 is a view showing an assembled positional relationship between an outer rotor and a pump body of the internal gear pump shown in fig. 1.

Fig. 15 is an outer rotor tooth profile view of the outer rotor of the internal gear pump shown in fig. 1 (the dash-dot line shows the pitch circle of the outer rotor).

Fig. 16 is a block diagram of an outer rotor of a crescent gear pump according to an embodiment of the present disclosure.

The hollow arrow in the figure indicates the liquid inlet direction, and the curved solid arrow indicates the rotation direction of the ring gear assembly.

Detailed Description

The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Before explaining the present disclosure with reference to the drawings, it should be noted in particular that:

The technical solutions and technical features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, the described embodiments, features, and combinations of features can be combined as desired and claimed in any given application.

The embodiments of the present disclosure referred to in the following description are typically only a few, but not all, embodiments, based on which all other embodiments, as may be obtained by one of ordinary skill in the art without undue effort, are intended to be within the scope of patent protection.

The terms "comprising," "including," "having," and any variations thereof in this disclosure and the corresponding claims and related parts are intended to cover a non-exclusive inclusion. Other related terms and units may be reasonably construed based on the disclosure to provide relevant content.

As shown in fig. 1-3, an internal gear pump mainly comprises a pump shell component 1 and an internal gear assembly 2.

The pump shell component 1 is internally provided with an internally meshed gear assembly installation working cavity 11, and a liquid inlet channel 12 and a liquid outlet channel 13 which are respectively communicated with the internally meshed gear assembly installation working cavity 11.

The ring gear assembly 2 is fitted in the ring gear assembly mounting working chamber 11 and includes a rotating shaft 21, an inner rotor 22 and an outer rotor 23.

The inner rotor 22 is mounted on the rotating shaft 21 and meshed with the outer rotor 23 to form an inner meshed gear pair, and a low-pressure liquid suction area correspondingly communicated with the liquid inlet channel 12 and a high-pressure liquid discharge area correspondingly communicated with the liquid discharge channel 13 are respectively formed between the inner rotor 22 and the outer rotor 23 when the inner meshed gear pair works. It should be noted that: the terms "low pressure" and "high pressure" herein refer to a relative pressure relationship between high and low, i.e., the pressure in the low pressure absorbent region is lower than the pressure in the high pressure absorbent region (or the pressure in the high pressure absorbent region is higher than the pressure in the low pressure absorbent region).

The pump shell assembly 1 comprises a pump body 14, and the working cavity 11, the liquid inlet channel 12 and the liquid outlet channel 13 are arranged in the pump body 14.

The pump body 14 is provided with a first ring gear assembly axial positioning surface 141 at the bottom of the ring gear assembly installation working cavity 11, the first ring gear assembly axial positioning surface 141 is matched with the first side end surface of the ring gear assembly 2, a first rotating shaft assembly hole 142 matched with the rotating shaft 21 is formed in the center of the first ring gear assembly axial positioning surface 141, and the outlet 121 of the liquid inlet channel 12 and the inlet 131 of the liquid discharge channel 13 are distributed on the first ring gear assembly axial positioning surface 141 and are located beside the first rotating shaft assembly hole 142.

Generally speaking, the outlet 121 of the liquid inlet channel 12 and the inlet 131 of the liquid discharge channel 13 are designed to be larger, so that the outlet 121 of the liquid inlet channel 12 and the inlet 131 of the liquid discharge channel 13 are distributed on the first ring gear assembly axial positioning surface 11, thereby forming an intermediate partition 143 between the outlet 121 of the liquid inlet channel 12 and the inlet 131 of the liquid discharge channel 13, and the intermediate partition 143 is provided with a first rotating shaft assembly hole 142 matched with the rotating shaft 21.

The pump housing assembly 1 further comprises an end cap member 15, the end cap member 15 being mounted on the pump body 14 and enclosing the ring gear assembly 2 within the pump housing assembly.

The inner side of the end cover member 15 is provided with a second ring gear assembly axial positioning surface 151 matched with the second side end surface of the ring gear assembly 2, and a second rotating shaft assembly hole 152 matched with the rotating shaft 21 is formed in the center of the second ring gear assembly axial positioning surface 151. Typically, a bearing is further mounted in the end cover member 15 for rotatably supporting the rotating shaft 21.

The basic construction of the internal gear pump is described above. The internal gear pump of the present embodiment is applied to a wind power gear box lubrication cooling system (specifically, for conveying lubrication oil of a wind power gear box), and is also designed to drive the rotation shaft 21 to rotate by using power transmitted by the wind power gear box. Since the rotation direction of the gears in the wind power gearbox is determined according to the rotation direction of the wind power blades, which in turn is randomly changed according to the wind direction, this results in that the rotation direction of the shaft 21 is also changed instead of being fixed. In order to realize that the convenience of the liquid (lubricating oil in this embodiment) delivered by the internal gear pump is always unchanged when the rotation direction of the rotating shaft 21 is changed, so that the pipeline facilities outside the internal gear pump are not changed, the internal gear pump of this embodiment also adopts the following special structural design.

As shown in fig. 1-9, the end cap member 15 specifically includes a reversing member and an end cap 157; the reversing member comprises a reversing disc 153, a first side end surface of the reversing disc 153 is provided with an inner gear assembly mounting sleeve 154, and a second side end surface of the reversing disc 153 is provided with a reversing disc side forward rotation stopping structure 155 and a reversing disc side reverse rotation stopping structure 156.

The inner cylindrical surface of the ring gear assembly mounting sleeve 154 is in fit connection with the outer wall of the outer rotor 23, the outer cylindrical surface of the ring gear assembly mounting sleeve 154 is in fit connection with the inner wall of the ring gear assembly mounting working chamber 11, the outer cylindrical surface and the inner cylindrical surface are eccentrically arranged, and when the ring gear assembly 2 is assembled in the inner cylindrical surface, the rotating shaft 21 and the outer cylindrical surface are coaxially arranged.

The end cover 157 is sleeved on the reversing member and detachably connected with the pump body 14, an end cover side forward rotation stopping structure 158 and an end cover side reverse rotation stopping structure 159 are arranged in the end cover 157, when the rotating shaft 21 drives the whole ring gear assembly 2 to rotate forward, the ring gear assembly 2 drives the whole reversing disc 153 to rotate forward until the reversing disc side forward rotation stopping structure 155 contacts with the end cover side forward rotation stopping structure 158 (see fig. 6), at this time, the reversing disc 153 stops rotating, a low-pressure liquid suction area and a high-pressure liquid discharge area formed during forward rotation between the inner rotor 22 and the outer rotor 23 are respectively communicated with the liquid inlet channel 12 and the liquid discharge channel 13 (see fig. 8), when the rotating shaft 21 drives the whole ring gear assembly 2 to rotate reversely, the ring gear assembly 2 drives the whole reversing disc 153 to rotate reversely until the reversing disc side reverse rotation stopping structure 156 contacts with the end cover side reverse rotation stopping structure 159 (see fig. 7), and at this time, the reversing disc 153 and the inner rotor 22 and the liquid suction area and the liquid discharge channel 13 are respectively communicated with the low-pressure liquid suction area and the liquid discharge channel 13 (see fig. 8).

The first side end surface of the reversing disc 153 forms the second ring gear assembly axial positioning surface 151, and the second shaft assembly hole 152 is formed in the center of the reversing disc 153.

As can be seen from fig. 8 to fig. 9, since the outer cylindrical surface and the inner cylindrical surface are eccentrically disposed, on the one hand, when the rotating shaft 21 rotates in a reversing manner, the ring gear assembly 2 applies a rotational torque to the ring gear assembly mounting sleeve 154, so that the ring gear assembly mounting sleeve 154 rotates, and the reversing disc 153 is started to reverse; on the other hand, the reversing of the reversing disc 153 changes the engagement direction of the ring gear assembly 2 in addition to the change in the rotation direction of the rotary shaft 21, and therefore, the positions of the low-pressure liquid suction area and the high-pressure liquid discharge area in the ring gear assembly 2 remain unchanged, whereby even if the rotation direction of the rotary shaft 21 is changed, the convenience of the liquid delivered by the ring gear pump is always unchanged (see the position and direction of the hollow arrow in fig. 8 and 9 are unchanged), so that the piping facilities outside the ring gear pump are not changed.

Generally, the bearing 1510 is installed in the end cap 157, and the shaft 21 passes through the second shaft assembly hole 152 and is assembled in the bearing 1510.

The above-described design of the reversing member, while skillfully realizing that the direction of the liquid delivered by the ring gear pump is not changed while allowing the change of the rotation direction of the rotation shaft 21, makes it difficult to design the lubrication liquid paths on both sides of the ring gear assembly 2 due to the eccentric movement of the ring gear assembly 2 (specifically, the outer rotor 23). This is also an important challenge faced in the design of the crescent gear pump of this embodiment.

Inner rotor side lubrication

As shown in fig. 1 to 12, a first liquid film groove 31 is provided on the inner rotor 22 and/or the pump housing assembly 1, and a high-pressure drainage channel 32 for communicating the drain channel 13 with the first liquid film groove 31 is provided on the pump housing assembly 1; the first liquid film groove 31 is defined in and extends along a surface of a first leakage-preventing fit area formed by at least one of the first side end surface and the second side end surface of the inner rotor 22 and the pump housing assembly 1.

In a specific embodiment, the first liquid film groove 31 includes a first inner rotor side first liquid film groove 311 disposed in a first anti-leakage matching area formed by matching between a first side end surface of the inner rotor 22 and the first ring gear assembly axial positioning surface 141, and the high pressure drainage channel 32 includes a pump body side high pressure drainage channel formed on the pump body 14 for communicating the liquid drainage channel 13 with the first inner rotor side first liquid film groove 311.

More specifically, the pump body side high pressure drainage channel includes a high pressure drainage groove 321 provided on the first ring gear assembly axial positioning surface 141 to conduct the inlet 131 of the drain channel 13 with the first liquid film groove 311 of the inner rotor. Of course, the pump body side high pressure drainage channel does not have to employ the high pressure drainage groove 321, and the opening of the hole in the intermediate partition 143 is also one of the alternatives.

As shown in fig. 12, after the inner rotor 22 is made transparent, the inner rotor first-side first liquid film groove 311 is visible, the inner rotor first-side first liquid film groove 311 is provided in a first anti-leakage fitting region formed by fitting between the first-side end surface of the inner rotor 22 and the first ring gear assembly axial positioning surface 141, and the inner rotor first-side first liquid film groove 311 extends along the surface of the first anti-leakage fitting region.

It is obvious that the "first leakage-preventing fit area" refers specifically to an area between the inner rotor 22 and the pump housing assembly 1 where leakage is always kept coincident, and particularly includes an area where the hub of the inner rotor 22 coincides with the periphery of the first rotation shaft fitting hole 142.

As can be seen, the high-pressure liquid in the liquid drain channel 13 is introduced into the first liquid film groove 31 through the high-pressure drainage channel 32, and since the first liquid film groove 31 is defined in and extends along the surface of the first anti-leakage fit region formed by the fit between at least one of the first side end surface and the second side end surface of the inner rotor 22 and the pump housing assembly 1, the high-pressure liquid entering the first liquid film groove 31 forms a continuous liquid film pad, and effectively prevents strain and wear between the first side end surface and/or the second side end surface of the inner rotor 22 and the pump housing assembly 1. Generally, the inner rotor 22 and the pump housing assembly 1 are in clearance fit at the first anti-leakage fit area, so that the liquid film in the first liquid film groove is further diffused outwards, and therefore, the liquid film pad has the functions of not only isolating, but also lubricating, washing pollution and taking away friction heat.

The first liquid film groove 311 on the first side of the inner rotor may be integrally formed on the axial positioning surface 141 of the first ring gear assembly; alternatively, the first liquid film groove 311 on the first side of the inner rotor may be integrally formed on the first side end surface of the inner rotor 22; alternatively, the first liquid film groove 311 on the first side of the inner rotor may be partially formed on the first ring gear assembly axial positioning surface 141 and partially formed on the first side end surface of the inner rotor 22.

In a preferred embodiment, the first liquid film groove 311 on the first side of the inner rotor is integrally formed on the axial positioning surface 141 of the first ring gear assembly, so that the first liquid film groove 311 on the first side of the inner rotor is directly machined when the axial positioning surface 141 of the first ring gear assembly is milled.

Here, the inner rotor first-side first-liquid-film groove 311 is an annular groove structure as a whole, so that the inner rotor first-side first-liquid-film groove 311 can be distributed in the circumferential direction of the inner rotor 22.

More specifically, the first liquid film groove 311 on the first side of the inner rotor has a main groove 312 and expansion grooves 313 connected and distributed on the main groove 312, the main groove 312 is an annular groove, and the expansion grooves 313 are arranged on the main groove 312 at intervals. The design of the main tank circuit 312 and the expansion tank circuit 313 connected and distributed on the main tank circuit 312 helps to expand and extend the first liquid film groove 311 on the first side of the inner rotor along the surface of the first anti-leakage fit area. When the main channel 312 is designed as an annular groove, the first liquid film groove 311 of the first side of the inner rotor is made to have an annular groove structure as a whole.

The expansion tank circuit 313 may be designed as a shallow groove opened at the edge of the main tank circuit 312, and a step is formed between the shallow groove and the main tank circuit 312 (see fig. 11). Because the main channel 312 is deeper, the liquid entering the main channel 312 can quickly fill the entire annular groove (main channel 312) with low flow resistance. Since the expansion tank circuit 313 is designed as a shallow groove formed at the edge of the main tank circuit 312, the liquid in the expansion tank circuit 313 can form a liquid film pad with larger area, and the supporting force of the liquid film on the inner rotor 22 is increased.

Further, the edge profile of the expansion tank circuit 313 includes an inner edge portion extending along an inner edge of the annular groove, an outer edge portion extending along an outer edge of the annular groove, and transition portions for respectively connecting both ends of the inner edge portion and both ends of the outer edge portion with the annular groove. In this way, the expansion groove 313 protrudes both from the inner side edge of the annular groove and from the outer side edge of the annular groove, further increasing the coverage of the inner rotor first side first liquid film groove 311.

Preferably, the inner edge portion is a circular arc line, the outer edge portion is a circular arc line, and the transition portion is a paraboloid line with smooth transition of the circular arc line connected with the transition portion, therefore, the edge of the expansion tank circuit 313 has a contact area with the axial positioning surface 141 of the first ring gear assembly as large as possible, generally, the inner rotor 22 and the axial positioning surface 141 of the first ring gear assembly are in clearance fit at the first anti-leakage fit area, so that the liquid film in the first liquid film groove 311 on the first side of the inner rotor is outwards diffused, and the edge of the expansion tank circuit 313 has a contact area with the axial positioning surface 141 of the first ring gear assembly as large as possible, so that the diffusion range of the liquid film is wider and the liquid film distribution is more uniform.

If possible, at least one of the inner and outer edge portions further has a boss 314 thereon, further increasing the area of the expansion tank 313.

Based on the structure shown in fig. 11-12, ideally, the lubrication mechanism between the first side end surface of the inner rotor 22 and the first ring gear assembly axial positioning surface 141 is as follows: the high-pressure lubricating oil at the inlet 131 of the liquid discharge channel 13 enters the main channel 312 through the high-pressure drainage groove 321, the lubricating oil entering the main channel 312 can quickly fill the whole annular groove with low flow resistance and enter each expansion channel 313, the lubricating oil in each expansion channel 313 forms a 'membrane pad', meanwhile, the lubricating oil in the main channel 312 and each expansion channel 313 dynamically diffuses towards the surrounding fit clearance, the diffusion directions mainly are radial outward diffusion and radial inward diffusion, a part of the lubricating oil which is radial outward diffusion finally enters the outlet 121 of the liquid inlet channel 12 and a part of the lubricating oil which is radial inward diffusion finally returns to the inlet 131 of the liquid discharge channel 13, and the lubricating oil which is radial inward diffusion finally enters the fit clearance between the first rotating shaft assembly hole 142 and the rotating shaft 21. Therefore, the liquid film pad formed by the first liquid film groove 311 on the first side of the inner rotor has the functions of lubrication, pollution flushing and friction heat removal.

As shown in fig. 10, a low-pressure backflow channel 144 may be formed in the pump body 14, and the low-pressure backflow channel is used for conducting between the hole wall of the first shaft assembly hole 142 and the liquid inlet channel 12, so that the liquid in the fit gap between the first shaft assembly hole 142 and the shaft 21 flows back to the liquid inlet channel 12. Thereby, the problem of accumulation of liquid (lubricating oil) in the fit clearance of the first shaft fitting hole 142 and the shaft 21 can be avoided.

As shown in fig. 3, 4-5, 8-9 and 12, on the basis of the arrangement of the first liquid film groove 311 of the first side of the inner rotor, the inner rotor 22 is provided with an inner rotor side drainage hole 221, a first end of the inner rotor side drainage hole 221 is communicated with the first liquid film groove 311 of the first side of the inner rotor, and a second end of the inner rotor side drainage hole 221 is communicated with a fit gap between a second side end surface of the inner rotor 22 and the axial positioning surface 151 of the second ring gear assembly.

When the first inner rotor side first liquid film groove 311 is in an annular groove structure, the positions of the inner rotor side drainage holes 221 on the inner rotor 22 are designed such that the inner rotor side drainage holes 221 move along the first inner rotor side first liquid film groove 311 in an annular direction and are always communicated with the first inner rotor side first liquid film groove 311 when the inner rotor 22 rotates, and the number of the inner rotor side drainage holes 221 is at least two.

Thereby, high-pressure liquid (lubricating oil) is introduced into the fit clearance between the second side end surface of the inner rotor 22 and the second ring gear assembly axial positioning surface 151 through the inner rotor side drainage hole 221, and lubrication between the second side end surface of the inner rotor 22 and the second ring gear assembly axial positioning surface 151 (reversing disc) is achieved.

External rotor side lubrication

As shown in fig. 1-16, at least one of the first side end surface and the second side end surface of the outer rotor 23 is provided with a plurality of second liquid film grooves 32 arranged at intervals along a circumference of the outer rotor, edge openings of the second liquid film grooves 32 extend to an outer rotor tooth profile formed by an inner contour of the outer rotor 32, and the shape, size and arrangement mode of the second liquid film grooves 32 enable the liquid inlet channel and the liquid outlet channel to be unable to be conducted through the second liquid film grooves.

Specifically, the second liquid film groove 32 includes a plurality of outer rotor first side second liquid film grooves formed on a first side end surface of the outer rotor 23 and arranged at intervals along a circumference of the outer rotor 23, and any of the outer rotor first side second liquid film grooves cannot completely span a second anti-leakage matching area formed by matching between the first side end surface of the outer rotor 23 and the intermediate partition 143, so that the outlet 121 of the liquid inlet channel 12 is in communication with the inlet 131 of the liquid outlet channel 13.

Specifically, the second liquid film groove 32 may further include a plurality of outer rotor second side second liquid film grooves formed on the second side end surface of the outer rotor 23 and arranged at intervals along a circumference of the outer rotor 23. In general, the outer rotor first side second liquid film groove and the outer rotor second side second liquid film groove are completely symmetrical in shape, size and arrangement on both sides of the outer rotor 23.

Generally, the second liquid film groove 32 is open to the side of the corresponding root portion 231 of the outer rotor tooth profile and its edge opening extends to the edge of the corresponding root portion 231.

In one embodiment, the second liquid film grooves 32 are formed in a one-to-one correspondence on the sides of each root portion 231 of the outer rotor profile.

In a preferred embodiment, the second liquid film groove 32 extends on both sides of a corresponding root portion 231 of the outer rotor tooth profile in which the second liquid film groove 32 is located (see fig. 13, 14 and 16).

In a preferred embodiment, the profile of root portion 231 is comprised primarily of an arcuate surface that makes a smooth transition with the arcuate surface of the outer rotor tooth profile that intersects the arcuate surface. This helps to increase the volume of liquid (lubricating oil) stored in the root portion 231.

In an alternative embodiment, radial drainage holes 232 are distributed on the outer wall of the outer rotor 23, and the radial drainage holes 232 penetrate to the corresponding tooth root portions 231. The liquid (lubricating oil) stored in the tooth root portion 231 can be guided to the outer wall (outer cylindrical surface) of the outer rotor 23 through the radial drainage hole 232, thereby lubricating the outer wall of the outer rotor 23.

By providing a plurality of second fluid film grooves 32 which are independent and are respectively arranged at intervals along the circumference of the outer rotor 23 on at least one of the first side end surface and the second side end surface of the outer rotor 23, the edge openings of the second fluid film grooves 32 extend to the tooth profile of the outer rotor formed by the inner contour of the outer rotor 23, and the shape, the size and the arrangement of the second fluid film grooves 32 are such that the fluid inlet channels 12 and the fluid outlet channels 13 cannot be conducted through the second fluid film grooves 32, so that when part of the second fluid film grooves 32 correspondingly connected with the tooth profile of the outer rotor (the meshing gap between the outer rotor 23 and the inner rotor 22) and the fluid outlet channels 13 are conducted along with the rotation of the outer rotor 23, the part of the second fluid film grooves 32 are filled with high-pressure liquid (lubricating oil) from the fluid outlet channels 13, and the high-pressure liquid can only be prevented from being filled in the liquid pump shell (the liquid side of the outer rotor) or the fluid outlet channels 13) when the second fluid film grooves 32 rotate, and the high-pressure liquid can not be completely connected with the fluid inlet channels 12 and the fluid outlet channels 13, and the high-pressure liquid can be prevented from being fully flowing out of the fluid grooves (the fluid film grooves 32) because the second fluid film grooves 32 are independently arranged.

The shape of the second liquid film groove 32 may take the shape shown in fig. 13 and 14, or may take the shape shown in fig. 16.

The above description has been made regarding the content of the present disclosure. Those of ordinary skill in the art will be able to implement the present disclosure based on these descriptions. Based on the foregoing specification, all other embodiments that may be obtained by one of ordinary skill in the art without making any inventive effort are intended to be within the scope of this disclosure.

Claims (10)

1. An internal gear pump comprising:

the pump shell assembly is internally provided with an inner meshing gear assembly installation working cavity, and a liquid inlet channel and a liquid outlet channel which are respectively communicated with the inner meshing gear assembly installation working cavity;

the inner meshing gear assembly is assembled in the inner meshing gear assembly installation working cavity and comprises a rotating shaft, an inner rotor and an outer rotor;

the inner rotor is arranged on the rotating shaft and meshed with the outer rotor to form an inner meshed gear pair, and a low-pressure liquid suction area correspondingly communicated with the liquid inlet channel and a high-pressure liquid discharge area correspondingly communicated with the liquid discharge channel are respectively formed between the inner rotor and the outer rotor when the inner meshed gear pair works;

The method is characterized in that:

at least one of the first side end surface and the second side end surface of the outer rotor is provided with a plurality of independent second liquid film grooves which are respectively arranged at intervals along a circle of the outer rotor, edge openings of the second liquid film grooves extend to an outer rotor tooth profile formed by the inner contour of the outer rotor, and the shape, the size and the arrangement mode of the second liquid film grooves enable the liquid inlet channel and the liquid outlet channel to be not communicated through the second liquid film grooves.

2. The internal gear pump of claim 1, wherein:

the pump shell assembly comprises a pump body, and the working cavity, the liquid inlet channel and the liquid outlet channel of the inner meshed gear assembly are arranged in the pump body;

the bottom of the pump body, which is positioned in the working cavity for installing the ring gear assembly, is provided with a first ring gear assembly axial positioning surface matched with the first side end surface of the ring gear assembly, the outlet of the liquid inlet channel and the inlet of the liquid discharge channel are distributed on the first ring gear assembly axial positioning surface, an intermediate baffle is formed between the outlet of the liquid inlet channel and the inlet of the liquid discharge channel, and a first rotating shaft assembly hole matched with the rotating shaft is formed in the intermediate baffle;

The second liquid film groove comprises a plurality of independent outer rotor first side second liquid film grooves which are arranged on the first side end surface of the outer rotor and are respectively arranged along the circumference of the outer rotor at intervals, and any outer rotor first side second liquid film groove cannot completely span a second anti-leakage matching area formed by matching between the first side end surface of the outer rotor and the middle partition plate so as to conduct the outlet of the liquid inlet channel with the inlet of the liquid discharge channel.

3. The internal gear pump of claim 2, wherein:

the pump housing assembly further comprises an end cap member mounted to the pump body and capping the ring gear assembly within the pump housing assembly;

the inner side of the end cover member is provided with a second inner meshed gear assembly axial positioning surface matched with the second side end surface of the inner meshed gear assembly, and a second rotating shaft assembly hole matched with the rotating shaft is formed in the center of the second inner meshed gear assembly axial positioning surface.

4. The internal gear pump of claim 3, wherein:

the end cap member comprises:

the reversing component comprises a reversing disc, an inner meshing gear assembly mounting sleeve is arranged on the first side end surface of the reversing disc, a reversing disc side forward rotation stopping structure and a reversing disc side reverse rotation stopping structure are arranged on the second side end surface of the reversing disc, an inner cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the outer wall of the outer rotor, an outer cylindrical surface of the inner meshing gear assembly mounting sleeve is matched and sleeved with the inner wall of the inner meshing gear assembly mounting working cavity, the outer cylindrical surface and the inner cylindrical surface are eccentrically arranged, and when the inner meshing gear assembly is assembled in the inner cylindrical surface, the rotating shaft and the outer cylindrical surface are coaxially arranged; and

The end cover is sleeved on the reversing member and is detachably connected with the pump body, an end cover side forward rotation stopping structure and an end cover side reverse rotation stopping structure are arranged in the end cover, when the rotating shaft drives the whole inner meshing gear assembly to rotate forward, the inner meshing gear assembly drives the whole reversing disc to rotate forward until the reversing disc side forward rotation stopping structure is contacted with the end cover side forward rotation stopping structure, at the moment, the reversing disc stops rotating, a low-pressure liquid suction area and a high-pressure liquid discharge area formed during forward rotation between the inner rotor and the outer rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel, and when the rotating shaft drives the whole inner meshing gear assembly to rotate reversely, the inner meshing gear assembly drives the whole reversing disc to rotate reversely until the reversing disc side reverse rotation stopping structure is contacted with the end cover side reverse rotation stopping structure, at the moment, and a low-pressure liquid suction area and a high-pressure liquid discharge area formed during reverse rotation between the reversing disc stops rotating and the inner rotor are respectively communicated with the liquid inlet channel and the liquid discharge channel;

the first side end surface of the reversing disc forms an axial positioning surface of the second ring gear assembly, and the second rotating shaft assembly Kong Kaishe is arranged at the center of the reversing disc.

5. The internal gear pump of claim 4, wherein: and a bearing is arranged in the end cover, and the rotating shaft passes through the second rotating shaft assembly hole and is assembled in the bearing.

6. The internal gear pump of claim 3, wherein: the second liquid film groove comprises a plurality of outer rotor second side second liquid film grooves which are arranged on the second side end surface of the outer rotor at intervals along the circumference of the outer rotor respectively.

7. The internal gear pump of claim 6, wherein: the outer rotor first side second liquid film groove and the outer rotor second side second liquid film groove are completely symmetrical on two sides of the outer rotor in shape, size and arrangement mode.

8. The internal gear pump of any of claims 1-7, wherein: the second liquid film groove is arranged on the side surface of the corresponding tooth root part of the outer rotor tooth profile, and the edge opening of the second liquid film groove extends to the edge of the corresponding tooth root part; and/or, the inner gear pair is an inner cycloidal gear pair, and then the inner gear pump is an inner cycloidal gear pump.

9. The internal gear pump of claim 8, wherein: the second liquid film grooves are formed on the side surface of each tooth root part of the outer rotor tooth profile in a one-to-one correspondence manner; and/or the second liquid film groove extends and extends to two sides of the corresponding root part of the external rotor tooth profile, which is used as a center; and/or the profile of the root portion is mainly composed of an arc surface, and the arc surface is in smooth transition with an arc surface intersecting with the arc surface on the tooth profile of the outer rotor; and/or radial drainage holes are distributed on the outer wall of the outer rotor, and the radial drainage holes penetrate through to the corresponding tooth root parts.

10. An external rotor of an internal gear pump, which is characterized in that: an external rotor for use in an internal gear pump according to any one of claims 1 to 9.